diff --git a/src/AbstractBtMessage.h b/src/AbstractBtMessage.h
index 07902eb8..918cd9de 100644
--- a/src/AbstractBtMessage.h
+++ b/src/AbstractBtMessage.h
@@ -100,7 +100,7 @@ public:
     this->uploading = uploading;
   }
 
-  virtual int32_t getId() {
+  virtual uint8_t getId() {
     return id;
   }
 
diff --git a/src/BitfieldMan.cc b/src/BitfieldMan.cc
index b29f4db7..37365534 100644
--- a/src/BitfieldMan.cc
+++ b/src/BitfieldMan.cc
@@ -36,7 +36,7 @@
 #include "Util.h"
 #include <string.h>
 
-BitfieldMan::BitfieldMan(int blockLength, long long int totalLength)
+BitfieldMan::BitfieldMan(uint32_t blockLength, uint64_t totalLength)
   :blockLength(blockLength), totalLength(totalLength), filterBitfield(0),
    filterEnabled(false), randomizer(0) {
   if(blockLength > 0 && totalLength > 0) {
@@ -71,25 +71,23 @@ BitfieldMan::BitfieldMan(const BitfieldMan& bitfieldMan):randomizer(0) {
 BitfieldMan::~BitfieldMan() {
   delete [] bitfield;
   delete [] useBitfield;
-  if(filterBitfield) {
-    delete [] filterBitfield;
-  }
+  delete [] filterBitfield;
 }
 
-int BitfieldMan::countSetBit(const unsigned char* bitfield, int len) const {
-  int count = 0;
-  int size = sizeof(unsigned int);
-  for(int i = 0; i < len/size; i++) {
-    count += Util::countBit(*(unsigned int*)&bitfield[i*size]);
+uint32_t BitfieldMan::countSetBit(const unsigned char* bitfield, uint32_t len) const {
+  uint32_t count = 0;
+  uint32_t size = sizeof(uint32_t);
+  for(uint32_t i = 0; i < len/size; i++) {
+    count += Util::countBit(*(uint32_t*)&bitfield[i*size]);
   }
-  for(int i = len-len%size; i < len; i++) {
-    count += Util::countBit((unsigned int)bitfield[i]);
+  for(uint32_t i = len-len%size; i < len; i++) {
+    count += Util::countBit((uint32_t)bitfield[i]);
   }
   return count;
 }
 
-int BitfieldMan::getNthBitIndex(const unsigned char bitfield, int nth) const {
-  int index = -1;
+int32_t BitfieldMan::getNthBitIndex(const unsigned char bitfield, uint32_t nth) const {
+  int32_t index = -1;
   for(int bs = 7; bs >= 0; bs--) {
     unsigned char mask = 1 << bs;
     if(bitfield & mask) {
@@ -103,22 +101,23 @@ int BitfieldMan::getNthBitIndex(const unsigned char bitfield, int nth) const {
   return index;
 }
 
-int
+int32_t
 BitfieldMan::getMissingIndexRandomly(const unsigned char* bitfield,
-				     int bitfieldLength) const
+				     uint32_t bitfieldLength) const
 {
-  int byte = (int)(((double)bitfieldLength)*
-		   randomizer->getRandomNumber()/
-		   (randomizer->getMaxRandomNumber()+1.0));
+  uint32_t byte = (int32_t)(((double)bitfieldLength)*
+			   randomizer->getRandomNumber()/
+			   (randomizer->getMaxRandomNumber()+1.0));
 
   unsigned char lastMask = 0;
-  int lastByteLength = totalLength%(blockLength*8);
-  int lastBlockCount = DIV_FLOOR(lastByteLength, blockLength);
-  for(int i = 0; i < lastBlockCount; i++) {
+  uint32_t lastByteLength = totalLength%(blockLength*8);
+  uint32_t lastBlockCount = DIV_FLOOR(lastByteLength, blockLength);
+  // TODO test this
+  for(uint32_t i = 0; i < lastBlockCount; i++) {
     lastMask >>= 1;
     lastMask |= 0x80;
   }
-  for(int i = 0; i < bitfieldLength; i++) {
+  for(uint32_t i = 0; i < bitfieldLength; i++) {
     unsigned char mask;
     if(byte == bitfieldLength-1) {
       mask = lastMask;
@@ -126,7 +125,7 @@ BitfieldMan::getMissingIndexRandomly(const unsigned char* bitfield,
       mask = 0xff;
     }
     if(bitfield[byte]&mask) {
-      int index = byte*8+getNthBitIndex(bitfield[byte], 1);
+      int32_t index = byte*8+getNthBitIndex(bitfield[byte], 1);
       return index;
     }
     byte++;
@@ -137,12 +136,12 @@ BitfieldMan::getMissingIndexRandomly(const unsigned char* bitfield,
   return -1;
 }
 
-bool BitfieldMan::hasMissingPiece(const unsigned char* peerBitfield, int length) const {
+bool BitfieldMan::hasMissingPiece(const unsigned char* peerBitfield, uint32_t length) const {
   if(bitfieldLength != length) {
     return false;
   }
   bool retval = false;
-  for(int i = 0; i < bitfieldLength; i++) {
+  for(uint32_t i = 0; i < bitfieldLength; i++) {
     unsigned char temp = peerBitfield[i] & ~bitfield[i];
     if(filterEnabled) {
       temp &= filterBitfield[i];
@@ -155,43 +154,43 @@ bool BitfieldMan::hasMissingPiece(const unsigned char* peerBitfield, int length)
   return retval;
 }
 
-int BitfieldMan::getMissingIndex(const unsigned char* peerBitfield, int length) const {
+int32_t BitfieldMan::getMissingIndex(const unsigned char* peerBitfield, uint32_t length) const {
   if(bitfieldLength != length) {
     return -1;
   }
   unsigned char* tempBitfield = new unsigned char[bitfieldLength];
-  for(int i = 0; i < bitfieldLength; i++) {
+  for(uint32_t i = 0; i < bitfieldLength; i++) {
     tempBitfield[i] = peerBitfield[i] & ~bitfield[i];
     if(filterEnabled) {
       tempBitfield[i] &= filterBitfield[i];
     }
   }
-  int index = getMissingIndexRandomly(tempBitfield, bitfieldLength);
+  int32_t index = getMissingIndexRandomly(tempBitfield, bitfieldLength);
   delete [] tempBitfield;
   return index;
 }
 
-int BitfieldMan::getMissingUnusedIndex(const unsigned char* peerBitfield, int length) const {
+int32_t BitfieldMan::getMissingUnusedIndex(const unsigned char* peerBitfield, uint32_t length) const {
   if(bitfieldLength != length) {
     return -1;
   }
   unsigned char* tempBitfield = new unsigned char[bitfieldLength];
-  for(int i = 0; i < bitfieldLength; i++) {
+  for(uint32_t i = 0; i < bitfieldLength; i++) {
     tempBitfield[i] = peerBitfield[i] & ~bitfield[i] & ~useBitfield[i];
     if(filterEnabled) {
       tempBitfield[i] &= filterBitfield[i];
     }
   }
-  int index = getMissingIndexRandomly(tempBitfield, bitfieldLength);
+  int32_t index = getMissingIndexRandomly(tempBitfield, bitfieldLength);
   delete [] tempBitfield;
   return index;
 }
 
-int BitfieldMan::getFirstMissingUnusedIndex(const unsigned char* peerBitfield, int length) const {
+int32_t BitfieldMan::getFirstMissingUnusedIndex(const unsigned char* peerBitfield, uint32_t length) const {
   if(bitfieldLength != length) {
     return -1;
   }
-  for(int i = 0; i < bitfieldLength; i++) {
+  for(uint32_t i = 0; i < bitfieldLength; i++) {
     unsigned char bit = peerBitfield[i] & ~bitfield[i] & ~useBitfield[i];
     if(filterEnabled) {
       bit &= filterBitfield[i];
@@ -206,8 +205,8 @@ int BitfieldMan::getFirstMissingUnusedIndex(const unsigned char* peerBitfield, i
   return -1;
 }
 
-int BitfieldMan::getFirstMissingUnusedIndex() const {
-  for(int i = 0; i < bitfieldLength; i++) {
+int32_t BitfieldMan::getFirstMissingUnusedIndex() const {
+  for(uint32_t i = 0; i < bitfieldLength; i++) {
     unsigned char bit = ~bitfield[i] & ~useBitfield[i];
     if(filterEnabled) {
       bit &= filterBitfield[i];
@@ -222,23 +221,23 @@ int BitfieldMan::getFirstMissingUnusedIndex() const {
   return -1;
 }
 
-int BitfieldMan::getMissingIndex() const {
+int32_t BitfieldMan::getMissingIndex() const {
   unsigned char* tempBitfield = new unsigned char[bitfieldLength];
-  for(int i = 0; i < bitfieldLength; i++) {
+  for(uint32_t i = 0; i < bitfieldLength; i++) {
     tempBitfield[i] = ~bitfield[i];
     if(filterEnabled) {
       tempBitfield[i] &= filterBitfield[i];
     }
   }
-  int index = getMissingIndexRandomly(tempBitfield, bitfieldLength);
+  int32_t index = getMissingIndexRandomly(tempBitfield, bitfieldLength);
   delete [] tempBitfield;
   return index;
 }
 
-int BitfieldMan::getMissingUnusedIndex() const {
+int32_t BitfieldMan::getMissingUnusedIndex() const {
   unsigned char* tempBitfield = new unsigned char[bitfieldLength];
   memset(tempBitfield, 0xff, bitfieldLength);
-  int index = getMissingUnusedIndex(tempBitfield, bitfieldLength);
+  int32_t index = getMissingUnusedIndex(tempBitfield, bitfieldLength);
   delete [] tempBitfield;
   return index;
 }
@@ -246,16 +245,16 @@ int BitfieldMan::getMissingUnusedIndex() const {
 // [startIndex, endIndex)
 class Range {
 public:
-  int startIndex;
-  int endIndex;
-  Range(int startIndex = 0, int endIndex = 0):startIndex(startIndex),
-					      endIndex(endIndex) {}
+  int32_t startIndex;
+  int32_t endIndex;
+  Range(int32_t startIndex = 0, int32_t endIndex = 0):startIndex(startIndex),
+						      endIndex(endIndex) {}
   
-  int getSize() const {
+  uint32_t getSize() const {
     return endIndex-startIndex;
   }
 
-  int getMidIndex() const {
+  int32_t getMidIndex() const {
     return (endIndex-startIndex)/2+startIndex;
   }
 
@@ -264,32 +263,32 @@ public:
   }
 };
 
-int BitfieldMan::getStartIndex(int index) const {
-  while(index < blocks &&
+int32_t BitfieldMan::getStartIndex(int32_t index) const {
+  while(index < (int32_t)blocks &&
 	(isUseBitSet(index) || isBitSet(index))) {
     index++;
   }
-  if(blocks <= index) {
+  if((int32_t)blocks <= index) {
     return -1;
   } else {
     return index;
   }
 }
 
-int BitfieldMan::getEndIndex(int index) const {
-  while(index < blocks &&
+int32_t BitfieldMan::getEndIndex(int32_t index) const {
+  while(index < (int32_t)blocks &&
 	(!isUseBitSet(index) && !isBitSet(index))) {
     index++;
   }
   return index;
 }
 
-int BitfieldMan::getSparseMissingUnusedIndex() const {
+int32_t BitfieldMan::getSparseMissingUnusedIndex() const {
   Range maxRange;
-  int index = 0;
-  int blocks = countBlock();
+  int32_t index = 0;
+  uint32_t blocks = countBlock();
   Range currentRange;
-  while(index < blocks) {
+  while(index < (int32_t)blocks) {
     currentRange.startIndex = getStartIndex(index);
     if(currentRange.startIndex == -1) {
       break;
@@ -313,7 +312,7 @@ int BitfieldMan::getSparseMissingUnusedIndex() const {
 
 BlockIndexes BitfieldMan::getAllMissingIndexes() const {
   BlockIndexes missingIndexes;
-  for(int i = 0; i < bitfieldLength; i++) {
+  for(uint32_t i = 0; i < bitfieldLength; i++) {
     unsigned char bit = ~bitfield[i];
     if(filterEnabled) {
       bit &= filterBitfield[i];
@@ -328,12 +327,12 @@ BlockIndexes BitfieldMan::getAllMissingIndexes() const {
   return missingIndexes;
 }
 
-BlockIndexes BitfieldMan::getAllMissingIndexes(const unsigned char* peerBitfield, int peerBitfieldLength) const {
+BlockIndexes BitfieldMan::getAllMissingIndexes(const unsigned char* peerBitfield, uint32_t peerBitfieldLength) const {
   BlockIndexes missingIndexes;
   if(bitfieldLength != peerBitfieldLength) {
     return missingIndexes;
   }
-  for(int i = 0; i < bitfieldLength; i++) {
+  for(uint32_t i = 0; i < bitfieldLength; i++) {
     unsigned char bit = peerBitfield[i] & ~bitfield[i];
     if(filterEnabled) {
       bit &= filterBitfield[i];
@@ -348,13 +347,13 @@ BlockIndexes BitfieldMan::getAllMissingIndexes(const unsigned char* peerBitfield
   return missingIndexes;
 }
 
-int BitfieldMan::countMissingBlock() const {
+uint32_t BitfieldMan::countMissingBlock() const {
   if(filterEnabled) {
     unsigned char* temp = new unsigned char[bitfieldLength];
-    for(int i = 0; i < bitfieldLength; i++) {
+    for(uint32_t i = 0; i < bitfieldLength; i++) {
       temp[i] = bitfield[i]&filterBitfield[i];
     }
-    int count =  countSetBit(filterBitfield, bitfieldLength)-
+    uint32_t count =  countSetBit(filterBitfield, bitfieldLength)-
       countSetBit(temp, bitfieldLength);
     delete [] temp;
     return count;
@@ -363,7 +362,7 @@ int BitfieldMan::countMissingBlock() const {
   }
 }
 
-int BitfieldMan::countBlock() const {
+uint32_t BitfieldMan::countBlock() const {
   if(filterEnabled) {
     return countSetBit(filterBitfield, bitfieldLength);
   } else {
@@ -371,8 +370,8 @@ int BitfieldMan::countBlock() const {
   }
 }
 
-bool BitfieldMan::setBitInternal(unsigned char* bitfield, int index, bool on) {
-  if(blocks <= index) { return false; }
+bool BitfieldMan::setBitInternal(unsigned char* bitfield, int32_t index, bool on) {
+  if((int32_t)blocks <= index) { return false; }
   unsigned char mask = 128 >> index%8;
   if(on) {
     bitfield[index/8] |= mask;
@@ -382,32 +381,32 @@ bool BitfieldMan::setBitInternal(unsigned char* bitfield, int index, bool on) {
   return true;
 }
 
-bool BitfieldMan::setUseBit(int index) {
+bool BitfieldMan::setUseBit(int32_t index) {
   return setBitInternal(useBitfield, index, true);
 }
 
-bool BitfieldMan::unsetUseBit(int index) {
+bool BitfieldMan::unsetUseBit(int32_t index) {
   return setBitInternal(useBitfield, index, false);
 }
 
-bool BitfieldMan::setBit(int index) {
+bool BitfieldMan::setBit(int32_t index) {
   return setBitInternal(bitfield, index, true);
 }
 
-bool BitfieldMan::unsetBit(int index) {
+bool BitfieldMan::unsetBit(int32_t index) {
   return setBitInternal(bitfield, index, false);
 }
 
 bool BitfieldMan::isAllBitSet() const {
   if(filterEnabled) {
-    for(int i = 0; i < bitfieldLength; i++) {
+    for(uint32_t i = 0; i < bitfieldLength; i++) {
       if((bitfield[i]&filterBitfield[i]) != filterBitfield[i]) {
 	return false;
       }
     }
     return true;
   } else {
-    for(int i = 0; i < bitfieldLength-1; i++) {
+    for(uint32_t i = 0; i < bitfieldLength-1; i++) {
       if(bitfield[i] != 0xff) {
 	return false;
       }
@@ -420,21 +419,21 @@ bool BitfieldMan::isAllBitSet() const {
   }
 }
 
-bool BitfieldMan::isBitSetInternal(const unsigned char* bitfield, int index) const {
-  if(index < 0 || blocks <= index) { return false; }
+bool BitfieldMan::isBitSetInternal(const unsigned char* bitfield, int32_t index) const {
+  if(index < 0 || (int32_t)blocks <= index) { return false; }
   unsigned char mask = 128 >> index%8;
   return (bitfield[index/8] & mask) != 0;
 }
 
-bool BitfieldMan::isBitSet(int index) const {
+bool BitfieldMan::isBitSet(int32_t index) const {
   return isBitSetInternal(bitfield, index);
 }
 
-bool BitfieldMan::isUseBitSet(int index) const {
+bool BitfieldMan::isUseBitSet(int32_t index) const {
   return isBitSetInternal(useBitfield, index);
 }
 
-void BitfieldMan::setBitfield(const unsigned char* bitfield, int bitfieldLength) {
+void BitfieldMan::setBitfield(const unsigned char* bitfield, uint32_t bitfieldLength) {
   if(this->bitfieldLength != bitfieldLength) {
     return;
   }
@@ -447,7 +446,7 @@ void BitfieldMan::clearAllBit() {
 }
 
 void BitfieldMan::setAllBit() {
-  for(int i = 0; i < blocks; i++) {
+  for(uint32_t i = 0; i < blocks; i++) {
     setBit(i);
   }
 }
@@ -457,23 +456,23 @@ void BitfieldMan::clearAllUseBit() {
 }
 
 void BitfieldMan::setAllUseBit() {
-  for(int i = 0; i < blocks; i++) {
+  for(uint32_t i = 0; i < blocks; i++) {
     setUseBit(i);
   }
 }
 
-bool BitfieldMan::setFilterBit(int index) {
+bool BitfieldMan::setFilterBit(int32_t index) {
   return setBitInternal(filterBitfield, index, true);
 }
 
-void BitfieldMan::addFilter(long long int offset, long long int length) {
+void BitfieldMan::addFilter(int64_t offset, uint64_t length) {
   if(!filterBitfield) {
     filterBitfield = new unsigned char[bitfieldLength];
     memset(filterBitfield, 0, bitfieldLength);
   }
-  int startBlock = offset/blockLength;
-  int endBlock = (offset+length-1)/blockLength;
-  for(int i = startBlock; i <= endBlock && i < blocks; i++) {
+  int32_t startBlock = offset/blockLength;
+  int32_t endBlock = (offset+length-1)/blockLength;
+  for(int i = startBlock; i <= endBlock && i < (int32_t)blocks; i++) {
     setFilterBit(i);
   }
 }
@@ -498,25 +497,25 @@ bool BitfieldMan::isFilterEnabled() const {
   return filterEnabled;
 }
 
-long long int BitfieldMan::getFilteredTotalLength() const {
+uint64_t BitfieldMan::getFilteredTotalLength() const {
   if(!filterBitfield) {
     return 0;
   }
-  int filteredBlocks = countSetBit(filterBitfield, bitfieldLength);
+  uint32_t filteredBlocks = countSetBit(filterBitfield, bitfieldLength);
   if(filteredBlocks == 0) {
     return 0;
   }
   if(isBitSetInternal(filterBitfield, blocks-1)) {
-    return ((long long int)filteredBlocks-1)*blockLength+getLastBlockLength();
+    return ((uint64_t)filteredBlocks-1)*blockLength+getLastBlockLength();
   } else {
-    return ((long long int)filteredBlocks)*blockLength;
+    return ((uint64_t)filteredBlocks)*blockLength;
   }
 }
 
-long long int BitfieldMan::getCompletedLength(bool useFilter) const {
+uint64_t BitfieldMan::getCompletedLength(bool useFilter) const {
   unsigned char* temp = new unsigned char[bitfieldLength];
   if(useFilter) {
-    for(int i = 0; i < bitfieldLength; i++) {
+    for(uint32_t i = 0; i < bitfieldLength; i++) {
       temp[i] = bitfield[i];
       if(filterEnabled) {
 	temp[i] &= filterBitfield[i];
@@ -525,25 +524,25 @@ long long int BitfieldMan::getCompletedLength(bool useFilter) const {
   } else {
     memcpy(temp, bitfield, bitfieldLength);
   }
-  int completedBlocks = countSetBit(temp, bitfieldLength);
-  long long int completedLength = 0;
+  uint32_t completedBlocks = countSetBit(temp, bitfieldLength);
+  uint64_t completedLength = 0;
   if(completedBlocks == 0) {
     completedLength = 0;
   } else {
     if(isBitSetInternal(temp, blocks-1)) {
-      completedLength = ((long long int)completedBlocks-1)*blockLength+getLastBlockLength();
+      completedLength = ((uint64_t)completedBlocks-1)*blockLength+getLastBlockLength();
     } else {
-      completedLength = ((long long int)completedBlocks)*blockLength;
+      completedLength = ((uint64_t)completedBlocks)*blockLength;
     }
   }
   delete [] temp;
   return completedLength;
 }
 
-long long int BitfieldMan::getCompletedLength() const {
+uint64_t BitfieldMan::getCompletedLength() const {
   return getCompletedLength(false);
 }
 
-long long int BitfieldMan::getFilteredCompletedLength() const {
+uint64_t BitfieldMan::getFilteredCompletedLength() const {
   return getCompletedLength(true);
 }
diff --git a/src/BitfieldMan.h b/src/BitfieldMan.h
index 43fb81a1..5b24e42e 100644
--- a/src/BitfieldMan.h
+++ b/src/BitfieldMan.h
@@ -43,29 +43,29 @@ typedef deque<int> BlockIndexes;
 
 class BitfieldMan {
 private:
-  int blockLength;
-  long long int totalLength;
+  uint32_t blockLength;
+  uint64_t totalLength;
   unsigned char* bitfield;
   unsigned char* useBitfield;
   unsigned char* filterBitfield;
-  int bitfieldLength;
-  int blocks;
+  uint32_t bitfieldLength;
+  uint32_t blocks;
   bool filterEnabled;
   RandomizerHandle randomizer;
 
-  int countSetBit(const unsigned char* bitfield, int len) const;
-  int getNthBitIndex(const unsigned char bit, int nth) const;
-  int getMissingIndexRandomly(const unsigned char* bitfield, int len) const;
-  bool isBitSetInternal(const unsigned char* bitfield, int index) const;
-  bool setBitInternal(unsigned char* bitfield, int index, bool on);
-  bool setFilterBit(int index);
+  uint32_t countSetBit(const unsigned char* bitfield, uint32_t len) const;
+  int32_t getNthBitIndex(const unsigned char bit, uint32_t nth) const;
+  int32_t getMissingIndexRandomly(const unsigned char* bitfield, uint32_t len) const;
+  bool isBitSetInternal(const unsigned char* bitfield, int32_t index) const;
+  bool setBitInternal(unsigned char* bitfield, int32_t index, bool on);
+  bool setFilterBit(int32_t index);
 
-  int getStartIndex(int index) const;
-  int getEndIndex(int index) const;
+  int32_t getStartIndex(int32_t index) const;
+  int32_t getEndIndex(int32_t index) const;
 
-  long long int getCompletedLength(bool useFilter) const;
+  uint64_t getCompletedLength(bool useFilter) const;
 public:
-  BitfieldMan(int blockLength, long long int totalLength);
+  BitfieldMan(uint32_t blockLength, uint64_t totalLength);
   BitfieldMan(const BitfieldMan& bitfieldMan);
   ~BitfieldMan();
 
@@ -98,53 +98,56 @@ public:
     return *this;
   }
 
-  int getBlockLength() const { return blockLength; }
-  int getLastBlockLength() const {
+  uint32_t getBlockLength() const { return blockLength; }
+
+  uint32_t getLastBlockLength() const {
     return totalLength-blockLength*(blocks-1);
   }
-  int getBlockLength(int index) const {
-    if(index == blocks-1) {
+
+  uint32_t getBlockLength(int32_t index) const {
+    if(index == (int32_t)(blocks-1)) {
       return getLastBlockLength();
-    } else if(0 <= index && index < blocks-1) {
+    } else if(0 <= index && index < (int32_t)(blocks-1)) {
       return getBlockLength();
     } else {
       return 0;
     }
   }
-  long long int getTotalLength() const { return totalLength; }
+
+  uint64_t getTotalLength() const { return totalLength; }
 
   /**
    * affected by filter
    */
-  bool hasMissingPiece(const unsigned char* bitfield, int len) const;
+  bool hasMissingPiece(const unsigned char* bitfield, uint32_t len) const;
   /**
    * affected by filter
    */
-  int getMissingIndex(const unsigned char* bitfield, int len) const;
+  int32_t getMissingIndex(const unsigned char* bitfield, uint32_t len) const;
   /**
    * affected by filter
    */
-  int getMissingIndex() const;
+  int32_t getMissingIndex() const;
   /**
    * affected by filter
    */
-  int getFirstMissingUnusedIndex(const unsigned char* bitfield, int len) const;
+  int32_t getFirstMissingUnusedIndex(const unsigned char* bitfield, uint32_t len) const;
   /**
    * affected by filter
    */
-  int getFirstMissingUnusedIndex() const;
+  int32_t getFirstMissingUnusedIndex() const;
   /**
    * affected by filter
    */
-  int getMissingUnusedIndex(const unsigned char* bitfield, int len) const;
+  int32_t getMissingUnusedIndex(const unsigned char* bitfield, uint32_t len) const;
   /**
    * affected by filter
    */
-  int getMissingUnusedIndex() const;
+  int32_t getMissingUnusedIndex() const;
   /**
    * affected by filter
    */
-  int getSparseMissingUnusedIndex() const;
+  int32_t getSparseMissingUnusedIndex() const;
   /**
    * affected by filter
    */
@@ -152,19 +155,20 @@ public:
   /**
    * affected by filter
    */
-  BlockIndexes getAllMissingIndexes(const unsigned char* bitfield, int len) const;
+  BlockIndexes getAllMissingIndexes(const unsigned char* bitfield, uint32_t len) const;
   /**
    * affected by filter
    */
-  int countMissingBlock() const;
-  bool setUseBit(int index);
-  bool unsetUseBit(int index);
+  uint32_t countMissingBlock() const;
 
-  bool setBit(int index);
-  bool unsetBit(int index);
+  bool setUseBit(int32_t index);
+  bool unsetUseBit(int32_t index);
 
-  bool isBitSet(int index) const;
-  bool isUseBitSet(int index) const;
+  bool setBit(int32_t index);
+  bool unsetBit(int32_t index);
+
+  bool isBitSet(int32_t index) const;
+  bool isUseBitSet(int32_t index) const;
 
   /**
    * affected by filter
@@ -172,16 +176,16 @@ public:
   bool isAllBitSet() const;
 
   const unsigned char* getBitfield() const { return bitfield; }
-  int getBitfieldLength() const { return bitfieldLength; }
+  uint32_t getBitfieldLength() const { return bitfieldLength; }
 
   /**
    * affected by filter
    */
-  int countBlock() const;
+  uint32_t countBlock() const;
 
-  int getMaxIndex() const { return blocks-1; }
+  int32_t getMaxIndex() const { return blocks-1; }
 
-  void setBitfield(const unsigned char* bitfield, int bitfieldLength);
+  void setBitfield(const unsigned char* bitfield, uint32_t bitfieldLength);
 
   void clearAllBit();
   void setAllBit();
@@ -189,7 +193,7 @@ public:
   void clearAllUseBit();
   void setAllUseBit();
 
-  void addFilter(long long int offset, long long int length);
+  void addFilter(int64_t offset, uint64_t length);
   /**
    * Clears filter and disables filter
    */
@@ -201,12 +205,14 @@ public:
   /**
    * affected by filter
    */
-  long long int getFilteredTotalLength() const;
-  long long int getCompletedLength() const;
+  uint64_t getFilteredTotalLength() const;
+
+  uint64_t getCompletedLength() const;
+
   /**
    * affected by filter
    */
-  long long int getFilteredCompletedLength() const;
+  uint64_t getFilteredCompletedLength() const;
 
   void setRandomizer(const RandomizerHandle& randomizer) {
     this->randomizer = randomizer;
diff --git a/src/BtAllowedFastMessage.cc b/src/BtAllowedFastMessage.cc
index 672a499c..1925d9d6 100644
--- a/src/BtAllowedFastMessage.cc
+++ b/src/BtAllowedFastMessage.cc
@@ -39,11 +39,11 @@
 
 BtAllowedFastMessageHandle BtAllowedFastMessage::create(const unsigned char* data, uint32_t dataLength) {
   if(dataLength != 5) {
-    throw new DlAbortEx("invalid payload size for %s, size = %d. It should be %d", "allowed fast", dataLength, 5);
+    throw new DlAbortEx("invalid payload size for %s, size = %u. It should be %d", "allowed fast", dataLength, 5);
   }
-  uint32_t id = PeerMessageUtil::getId(data);
+  uint8_t id = PeerMessageUtil::getId(data);
   if(id != ID) {
-    throw new DlAbortEx("invalid ID=%d for %s. It should be %d.",
+    throw new DlAbortEx("invalid ID=%u for %s. It should be %d.",
 			id, "allowed fast", ID);
   }
   BtAllowedFastMessageHandle message = new BtAllowedFastMessage();
@@ -61,7 +61,7 @@ void BtAllowedFastMessage::doReceivedAction() {
 
 uint32_t BtAllowedFastMessage::MESSAGE_LENGTH = 9;
 
-const char* BtAllowedFastMessage::getMessage() {
+const unsigned char* BtAllowedFastMessage::getMessage() {
   if(!msg) {
     /**
      * len --- 5, 4bytes
@@ -69,7 +69,7 @@ const char* BtAllowedFastMessage::getMessage() {
      * piece index --- index, 4bytes
      * total: 9bytes
      */
-    msg = new char[MESSAGE_LENGTH];
+    msg = new unsigned char[MESSAGE_LENGTH];
     PeerMessageUtil::createPeerMessageString(msg, MESSAGE_LENGTH, 5, ID);
     PeerMessageUtil::setIntParam(&msg[5], index);
   }
@@ -85,5 +85,5 @@ void BtAllowedFastMessage::onSendComplete() {
 }
 
 string BtAllowedFastMessage::toString() const {
-  return "allowed fast index="+Util::uitos(index);
+  return "allowed fast index="+Util::itos(index);
 }
diff --git a/src/BtAllowedFastMessage.h b/src/BtAllowedFastMessage.h
index 8ace1619..75b03460 100644
--- a/src/BtAllowedFastMessage.h
+++ b/src/BtAllowedFastMessage.h
@@ -43,12 +43,12 @@ typedef SharedHandle<BtAllowedFastMessage> BtAllowedFastMessageHandle;
 
 class BtAllowedFastMessage : public SimpleBtMessage {
 private:
-  uint32_t index;
-  char* msg;
+  int32_t index;
+  unsigned char* msg;
 
   static uint32_t MESSAGE_LENGTH;
 public:
-  BtAllowedFastMessage(uint32_t index = 0)
+  BtAllowedFastMessage(int32_t index = 0)
     :SimpleBtMessage(),
      index(index),
      msg(0) {}
@@ -61,18 +61,18 @@ public:
     ID = 17
   };
 
-  void setIndex(uint32_t index) {
+  void setIndex(int32_t index) {
     this->index = index;
   }
-  uint32_t getIndex() const { return index; }
+  int32_t getIndex() const { return index; }
 
   static BtAllowedFastMessageHandle create(const unsigned char* data, uint32_t dataLength);
 
-  virtual int32_t getId() const { return ID; }
+  virtual uint8_t getId() const { return ID; }
 
   virtual void doReceivedAction();
 
-  virtual const char* getMessage();
+  virtual const unsigned char* getMessage();
 
   virtual uint32_t getMessageLength();
 
diff --git a/src/BtBitfieldMessage.cc b/src/BtBitfieldMessage.cc
index 35d0894d..d5ccd3e1 100644
--- a/src/BtBitfieldMessage.cc
+++ b/src/BtBitfieldMessage.cc
@@ -54,7 +54,7 @@ BtBitfieldMessage::create(const unsigned char* data, uint32_t dataLength)
   if(dataLength <= 1) {
     throw new DlAbortEx("invalid payload size for %s, size = %d. It should be greater than %d", "bitfield", dataLength, 1);
   }
-  int32_t id = PeerMessageUtil::getId(data);
+  uint8_t id = PeerMessageUtil::getId(data);
   if(id != ID) {
     throw new DlAbortEx("invalid ID=%d for %s. It should be %d.",
 			id, "bitfield", ID);
@@ -68,7 +68,7 @@ void BtBitfieldMessage::doReceivedAction() {
   peer->setBitfield(bitfield, bitfieldLength);
 }
 
-const char* BtBitfieldMessage::getMessage() {
+const unsigned char* BtBitfieldMessage::getMessage() {
   if(!msg) {
     /**
      * len --- 1+bitfieldLength, 4bytes
@@ -77,7 +77,7 @@ const char* BtBitfieldMessage::getMessage() {
      * total: 5+len bytes
      */
     msgLength = 5+bitfieldLength;
-    msg = new char[msgLength];
+    msg = new unsigned char[msgLength];
     PeerMessageUtil::createPeerMessageString(msg, msgLength,
 					     1+bitfieldLength, ID);
     memcpy(msg+5, bitfield, bitfieldLength);
diff --git a/src/BtBitfieldMessage.h b/src/BtBitfieldMessage.h
index 15bc13aa..64bbf209 100644
--- a/src/BtBitfieldMessage.h
+++ b/src/BtBitfieldMessage.h
@@ -45,8 +45,8 @@ class BtBitfieldMessage : public SimpleBtMessage {
 private:
   unsigned char* bitfield;
   uint32_t bitfieldLength;
-  char* msg;
-  int msgLength;
+  unsigned char* msg;
+  uint32_t msgLength;
 
   void init() {
     bitfield = 0;
@@ -84,11 +84,11 @@ public:
 
   static BtBitfieldMessageHandle create(const unsigned char* data, uint32_t dataLength);
 
-  virtual int32_t getId() const { return ID; }
+  virtual uint8_t getId() const { return ID; }
 
   virtual void doReceivedAction();
 
-  virtual const char* getMessage();
+  virtual const unsigned char* getMessage();
 
   virtual uint32_t getMessageLength();
 
diff --git a/src/BtCancelMessage.cc b/src/BtCancelMessage.cc
index ec2f2447..9a866e6c 100644
--- a/src/BtCancelMessage.cc
+++ b/src/BtCancelMessage.cc
@@ -39,11 +39,11 @@
 
 BtCancelMessageHandle BtCancelMessage::create(const unsigned char* data, uint32_t dataLength) {
   if(dataLength != 13) {
-    throw new DlAbortEx("invalid payload size for %s, size = %d. It should be %d", "cancel", dataLength, 13);
+    throw new DlAbortEx("invalid payload size for %s, size = %u. It should be %d", "cancel", dataLength, 13);
   }
-  int32_t id = PeerMessageUtil::getId(data);
+  uint8_t id = PeerMessageUtil::getId(data);
   if(id != ID) {
-    throw new DlAbortEx("invalid ID=%d for %s. It should be %d.",
+    throw new DlAbortEx("invalid ID=%u for %s. It should be %d.",
 			id, "cancel", ID);
   }
   BtCancelMessageHandle message = new BtCancelMessage();
@@ -59,7 +59,7 @@ void BtCancelMessage::doReceivedAction() {
 
 uint32_t BtCancelMessage::MESSAGE_LENGTH = 17;
 
-const char* BtCancelMessage::getMessage() {
+const unsigned char* BtCancelMessage::getMessage() {
   if(!msg) {
     /**
      * len --- 13, 4bytes
@@ -69,7 +69,7 @@ const char* BtCancelMessage::getMessage() {
      * length -- length, 4bytes
      * total: 17bytes
      */
-    msg = new char[MESSAGE_LENGTH];
+    msg = new unsigned char[MESSAGE_LENGTH];
     PeerMessageUtil::createPeerMessageString(msg, MESSAGE_LENGTH, 13, ID);
     PeerMessageUtil::setIntParam(&msg[5], index);
     PeerMessageUtil::setIntParam(&msg[9], begin);
@@ -83,6 +83,6 @@ uint32_t BtCancelMessage::getMessageLength() {
 }
 
 string BtCancelMessage::toString() const {
-  return "cancel index="+Util::uitos(index)+", begin="+Util::uitos(begin)+
+  return "cancel index="+Util::itos(index)+", begin="+Util::itos(begin)+
     ", length="+Util::uitos(length);
 }
diff --git a/src/BtCancelMessage.h b/src/BtCancelMessage.h
index ceee62fb..6416408a 100644
--- a/src/BtCancelMessage.h
+++ b/src/BtCancelMessage.h
@@ -43,14 +43,14 @@ typedef SharedHandle<BtCancelMessage> BtCancelMessageHandle;
 
 class BtCancelMessage : public SimpleBtMessage {
 private:
-  uint32_t index;
-  uint32_t begin;
+  int32_t index;
+  int32_t begin;
   uint32_t length;
-  char* msg;
+  unsigned char* msg;
 
   static uint32_t MESSAGE_LENGTH;
 public:
-  BtCancelMessage(uint32_t index = 0, uint32_t begin = 0, uint32_t length = 0)
+  BtCancelMessage(int32_t index = 0, int32_t begin = 0, uint32_t length = 0)
     :SimpleBtMessage(),
      index(index),
      begin(begin),
@@ -65,13 +65,13 @@ public:
     ID = 8
   };
 
-  uint32_t getIndex() const { return index; }
+  int32_t getIndex() const { return index; }
 
-  void setIndex(uint32_t index) { this->index = index; }
+  void setIndex(int32_t index) { this->index = index; }
 
-  uint32_t getBegin() const { return begin; }
+  int32_t getBegin() const { return begin; }
 
-  void setBegin(uint32_t begin) { this->begin = begin; }
+  void setBegin(int32_t begin) { this->begin = begin; }
 
   uint32_t getLength() const { return length; }
 
@@ -79,11 +79,11 @@ public:
 
   static BtCancelMessageHandle create(const unsigned char* data, uint32_t dataLength);
 
-  virtual int32_t getId() const { return ID; }
+  virtual uint8_t getId() const { return ID; }
 
   virtual void doReceivedAction();
 
-  virtual const char* getMessage();
+  virtual const unsigned char* getMessage();
 
   virtual uint32_t getMessageLength();
 
diff --git a/src/BtCancelSendingPieceEvent.h b/src/BtCancelSendingPieceEvent.h
index 90dbb936..5494f909 100644
--- a/src/BtCancelSendingPieceEvent.h
+++ b/src/BtCancelSendingPieceEvent.h
@@ -39,28 +39,28 @@
 
 class BtCancelSendingPieceEvent : public BtEvent {
 private:
-  uint32_t index;
-  uint32_t begin;
+  int32_t index;
+  int32_t begin;
   uint32_t length;
 public:
-  BtCancelSendingPieceEvent(uint32_t index, uint32_t begin, uint32_t length):
+  BtCancelSendingPieceEvent(int32_t index, int32_t begin, uint32_t length):
     index(index), begin(begin), length(length) {}
 
   virtual ~BtCancelSendingPieceEvent() {}
 
-  void setIndex(uint32_t index) {
+  void setIndex(int32_t index) {
     this->index = index;
   }
 
-  uint32_t getIndex() const {
+  int32_t getIndex() const {
     return index;
   }
 
-  void setBegin(uint32_t begin) {
+  void setBegin(int32_t begin) {
     this->begin = begin;
   }
 
-  uint32_t getBegin() const {
+  int32_t getBegin() const {
     return begin;
   }
 
diff --git a/src/BtChokeMessage.cc b/src/BtChokeMessage.cc
index 09465511..54e23974 100644
--- a/src/BtChokeMessage.cc
+++ b/src/BtChokeMessage.cc
@@ -40,7 +40,7 @@ BtChokeMessageHandle BtChokeMessage::create(const unsigned char* data, uint32_t
   if(dataLength != 1) {
     throw new DlAbortEx("invalid payload size for %s, size = %d. It should be %d", "choke", dataLength, 1);
   }
-  int32_t id = PeerMessageUtil::getId(data);
+  uint8_t id = PeerMessageUtil::getId(data);
   if(id != ID) {
     throw new DlAbortEx("invalid ID=%d for %s. It should be %d.",
 			id, "choke", ID);
@@ -60,14 +60,14 @@ bool BtChokeMessage::sendPredicate() const {
 
 uint32_t BtChokeMessage::MESSAGE_LENGTH = 5;
 
-const char* BtChokeMessage::getMessage() {
+const unsigned char* BtChokeMessage::getMessage() {
   if(!msg) {
     /**
      * len --- 1, 4bytes
      * id --- 0, 1byte
      * total: 5bytes
      */
-    msg = new char[MESSAGE_LENGTH];
+    msg = new unsigned char[MESSAGE_LENGTH];
     PeerMessageUtil::createPeerMessageString(msg, MESSAGE_LENGTH, 1, ID);
   }
   return msg;
diff --git a/src/BtChokeMessage.h b/src/BtChokeMessage.h
index b8ee8fee..8b06c2b8 100644
--- a/src/BtChokeMessage.h
+++ b/src/BtChokeMessage.h
@@ -43,7 +43,7 @@ typedef SharedHandle<BtChokeMessage> BtChokeMessageHandle;
 
 class BtChokeMessage : public SimpleBtMessage {
 private:
-  char* msg;
+  unsigned char* msg;
 
   static uint32_t MESSAGE_LENGTH;
 public:
@@ -57,11 +57,11 @@ public:
     ID = 0
   };
 
-  virtual int32_t getId() const { return ID; }
+  virtual uint8_t getId() const { return ID; }
 
   virtual void doReceivedAction();
 
-  virtual const char* getMessage();
+  virtual const unsigned char* getMessage();
 
   virtual uint32_t getMessageLength();
 
diff --git a/src/BtHandshakeMessage.cc b/src/BtHandshakeMessage.cc
index 0c883d2e..a2dd39df 100644
--- a/src/BtHandshakeMessage.cc
+++ b/src/BtHandshakeMessage.cc
@@ -73,9 +73,9 @@ BtHandshakeMessageHandle BtHandshakeMessage::create(const unsigned char* data, u
   return message;
 }
 
-const char* BtHandshakeMessage::getMessage() {
+const unsigned char* BtHandshakeMessage::getMessage() {
   if(!msg) {
-    msg = new char[MESSAGE_LENGTH];
+    msg = new unsigned char[MESSAGE_LENGTH];
     msg[0] = pstrlen;
     memcpy(msg+1, pstr, PSTR_LENGTH);
     memcpy(msg+20, reserved, RESERVED_LENGTH);
diff --git a/src/BtHandshakeMessage.h b/src/BtHandshakeMessage.h
index 427343ab..21f05cee 100644
--- a/src/BtHandshakeMessage.h
+++ b/src/BtHandshakeMessage.h
@@ -53,7 +53,7 @@ private:
   unsigned char* reserved;
   unsigned char* infoHash;
   unsigned char* peerId;
-  char* msg;
+  unsigned char* msg;
   void init();
 public:
   BtHandshakeMessage();
@@ -73,11 +73,11 @@ public:
     delete [] peerId;
   }
 
-  virtual int32_t getId() const { return INT32_MAX; }
+  virtual uint8_t getId() const { return UINT8_MAX; }
 
   virtual void doReceivedAction() {};
 
-  virtual const char* getMessage();
+  virtual const unsigned char* getMessage();
 
   virtual uint32_t getMessageLength();
 
diff --git a/src/BtHaveAllMessage.cc b/src/BtHaveAllMessage.cc
index a8d2c671..d82623b8 100644
--- a/src/BtHaveAllMessage.cc
+++ b/src/BtHaveAllMessage.cc
@@ -40,7 +40,7 @@ BtHaveAllMessageHandle BtHaveAllMessage::create(const unsigned char* data, uint3
   if(dataLength != 1) {
     throw new DlAbortEx("invalid payload size for %s, size = %d. It should be %d", "have all", dataLength, 1);
   }
-  int32_t id = PeerMessageUtil::getId(data);
+  uint8_t id = PeerMessageUtil::getId(data);
   if(id != ID) {
     throw new DlAbortEx("invalid ID=%d for %s. It should be %d.",
 			id, "have all", ID);
@@ -59,14 +59,14 @@ void BtHaveAllMessage::doReceivedAction() {
 
 uint32_t BtHaveAllMessage::MESSAGE_LENGTH = 5;
 
-const char* BtHaveAllMessage::getMessage() {
+const unsigned char* BtHaveAllMessage::getMessage() {
   if(!msg) {
     /**
      * len --- 1, 4bytes
      * id --- 14, 1byte
      * total: 5bytes
      */
-    msg = new char[MESSAGE_LENGTH];
+    msg = new unsigned char[MESSAGE_LENGTH];
     PeerMessageUtil::createPeerMessageString(msg, MESSAGE_LENGTH, 1, ID);
   }
   return msg;
diff --git a/src/BtHaveAllMessage.h b/src/BtHaveAllMessage.h
index bce5dc85..9afe25a3 100644
--- a/src/BtHaveAllMessage.h
+++ b/src/BtHaveAllMessage.h
@@ -43,7 +43,7 @@ typedef SharedHandle<BtHaveAllMessage> BtHaveAllMessageHandle;
 
 class BtHaveAllMessage : public SimpleBtMessage {
 private:
-  char* msg;
+  unsigned char* msg;
 
   static uint32_t MESSAGE_LENGTH;
 public:
@@ -59,11 +59,11 @@ public:
 
   static BtHaveAllMessageHandle create(const unsigned char* data, uint32_t dataLength);
 
-  virtual int32_t getId() const { return ID; }
+  virtual uint8_t getId() const { return ID; }
 
   virtual void doReceivedAction();
 
-  virtual const char* getMessage();
+  virtual const unsigned char* getMessage();
 
   virtual uint32_t getMessageLength();
 
diff --git a/src/BtHaveMessage.cc b/src/BtHaveMessage.cc
index fdcda7fa..b8e2eab7 100644
--- a/src/BtHaveMessage.cc
+++ b/src/BtHaveMessage.cc
@@ -39,11 +39,11 @@
 
 BtHaveMessageHandle BtHaveMessage::create(const unsigned char* data, uint32_t dataLength) {
   if(dataLength != 5) {
-    throw new DlAbortEx("invalid payload size for %s, size = %d. It should be %d", "have", dataLength, 5);
+    throw new DlAbortEx("invalid payload size for %s, size = %u. It should be %d", "have", dataLength, 5);
   }
-  int32_t id = PeerMessageUtil::getId(data);
+  uint8_t id = PeerMessageUtil::getId(data);
   if(id != ID) {
-    throw new DlAbortEx("invalid ID=%d for %s. It should be %d.",
+    throw new DlAbortEx("invalid ID=%u for %s. It should be %d.",
 			id, "have", ID);
   }
   BtHaveMessageHandle message = new BtHaveMessage();
@@ -61,7 +61,7 @@ bool BtHaveMessage::sendPredicate() const {
 
 uint32_t BtHaveMessage::MESSAGE_LENGTH = 9;
 
-const char* BtHaveMessage::getMessage() {
+const unsigned char* BtHaveMessage::getMessage() {
   if(!msg) {
     /**
      * len --- 5, 4bytes
@@ -69,7 +69,7 @@ const char* BtHaveMessage::getMessage() {
      * piece index --- index, 4bytes
      * total: 9bytes
      */
-    msg = new char[MESSAGE_LENGTH];
+    msg = new unsigned char[MESSAGE_LENGTH];
     PeerMessageUtil::createPeerMessageString(msg, MESSAGE_LENGTH, 5, ID);
     PeerMessageUtil::setIntParam(&msg[5], index);
   }
@@ -81,5 +81,5 @@ uint32_t BtHaveMessage::getMessageLength() {
 }
 
 string BtHaveMessage::toString() const {
-  return "have index="+Util::uitos(index);
+  return "have index="+Util::itos(index);
 }
diff --git a/src/BtHaveMessage.h b/src/BtHaveMessage.h
index e0ad84e2..2209ae0d 100644
--- a/src/BtHaveMessage.h
+++ b/src/BtHaveMessage.h
@@ -43,11 +43,11 @@ typedef SharedHandle<BtHaveMessage> BtHaveMessageHandle;
 
 class BtHaveMessage : public SimpleBtMessage {
 private:
-  uint32_t index;
-  char* msg;
+  int32_t index;
+  unsigned char* msg;
   static uint32_t MESSAGE_LENGTH;
 public:
-  BtHaveMessage(uint32_t index = 0):index(index), msg(0) {}
+  BtHaveMessage(int32_t index = 0):index(index), msg(0) {}
 
   virtual ~BtHaveMessage() {
     delete [] msg;
@@ -57,19 +57,19 @@ public:
     ID = 4
   };
 
-  void setIndex(uint32_t index) {
+  void setIndex(int32_t index) {
     this->index = index;
   }
 
-  uint32_t getIndex() const { return index; }
+  int32_t getIndex() const { return index; }
 
   static BtHaveMessageHandle create(const unsigned char* data, uint32_t dataLength);
 
-  virtual int32_t getId() const { return ID; }
+  virtual uint8_t getId() const { return ID; }
 
   virtual void doReceivedAction();
 
-  virtual const char* getMessage();
+  virtual const unsigned char* getMessage();
 
   virtual uint32_t getMessageLength();
 
diff --git a/src/BtHaveNoneMessage.cc b/src/BtHaveNoneMessage.cc
index e501f56f..398e56f7 100644
--- a/src/BtHaveNoneMessage.cc
+++ b/src/BtHaveNoneMessage.cc
@@ -40,7 +40,7 @@ BtHaveNoneMessageHandle BtHaveNoneMessage::create(const unsigned char* data, uin
   if(dataLength != 1) {
     throw new DlAbortEx("invalid payload size for %s, size = %d. It should be %d", "have none", dataLength, 1);
   }
-  int32_t id = PeerMessageUtil::getId(data);
+  uint8_t id = PeerMessageUtil::getId(data);
   if(id != ID) {
     throw new DlAbortEx("invalid ID=%d for %s. It should be %d.",
 			id, "have none", ID);
@@ -58,14 +58,14 @@ void BtHaveNoneMessage::doReceivedAction() {
 
 uint32_t BtHaveNoneMessage::MESSAGE_LENGTH = 5;
 
-const char* BtHaveNoneMessage::getMessage() {
+const unsigned char* BtHaveNoneMessage::getMessage() {
   if(!msg) {
     /**
      * len --- 1, 4bytes
      * id --- 15, 1byte
      * total: 5bytes
      */
-    msg = new char[MESSAGE_LENGTH];
+    msg = new unsigned char[MESSAGE_LENGTH];
     PeerMessageUtil::createPeerMessageString(msg, MESSAGE_LENGTH, 1, ID);
   }
   return msg;
diff --git a/src/BtHaveNoneMessage.h b/src/BtHaveNoneMessage.h
index ca77d5c5..0fbf3be9 100644
--- a/src/BtHaveNoneMessage.h
+++ b/src/BtHaveNoneMessage.h
@@ -43,7 +43,7 @@ typedef SharedHandle<BtHaveNoneMessage> BtHaveNoneMessageHandle;
 
 class BtHaveNoneMessage : public SimpleBtMessage {
 private:
-  char* msg;
+  unsigned char* msg;
 
   static uint32_t MESSAGE_LENGTH;
 public:
@@ -59,11 +59,11 @@ public:
   
   static BtHaveNoneMessageHandle create(const unsigned char* data, uint32_t dataLength);
 
-  virtual int32_t getId() const { return ID; }
+  virtual uint8_t getId() const { return ID; }
 
   virtual void doReceivedAction();
 
-  virtual const char* getMessage();
+  virtual const unsigned char* getMessage();
 
   virtual uint32_t getMessageLength();
 
diff --git a/src/BtInterestedMessage.cc b/src/BtInterestedMessage.cc
index c3680042..e1b8fc4c 100644
--- a/src/BtInterestedMessage.cc
+++ b/src/BtInterestedMessage.cc
@@ -40,7 +40,7 @@ BtInterestedMessageHandle BtInterestedMessage::create(const unsigned char* data,
   if(dataLength != 1) {
     throw new DlAbortEx("invalid payload size for %s, size = %d. It should be %d", "interested", dataLength, 1);
   }
-  int32_t id = PeerMessageUtil::getId(data);
+  uint8_t id = PeerMessageUtil::getId(data);
   if(id != ID) {
     throw new DlAbortEx("invalid ID=%d for %s. It should be %d.",
 			id, "interested", ID);
@@ -59,14 +59,14 @@ bool BtInterestedMessage::sendPredicate() const {
 
 uint32_t BtInterestedMessage::MESSAGE_LENGTH = 5;
 
-const char* BtInterestedMessage::getMessage() {
+const unsigned char* BtInterestedMessage::getMessage() {
   if(!msg) {
     /**
      * len --- 1, 4bytes
      * id --- 2, 1byte
      * total: 5bytes
      */
-    msg = new char[MESSAGE_LENGTH];
+    msg = new unsigned char[MESSAGE_LENGTH];
     PeerMessageUtil::createPeerMessageString(msg, MESSAGE_LENGTH, 1, ID);
   }
   return msg;
diff --git a/src/BtInterestedMessage.h b/src/BtInterestedMessage.h
index 3a7b27b7..30e200d4 100644
--- a/src/BtInterestedMessage.h
+++ b/src/BtInterestedMessage.h
@@ -43,7 +43,7 @@ typedef SharedHandle<BtInterestedMessage> BtInterestedMessageHandle;
 
 class BtInterestedMessage : public SimpleBtMessage {
 private:
-  char* msg;
+  unsigned char* msg;
 
   static uint32_t MESSAGE_LENGTH;
 public:
@@ -59,11 +59,11 @@ public:
 
   static BtInterestedMessageHandle create(const unsigned char* data, uint32_t dataLength);
 
-  virtual int32_t getId() const { return ID; }
+  virtual uint8_t getId() const { return ID; }
 
   virtual void doReceivedAction();
 
-  virtual const char* getMessage();
+  virtual const unsigned char* getMessage();
 
   virtual uint32_t getMessageLength();
 
diff --git a/src/BtKeepAliveMessage.cc b/src/BtKeepAliveMessage.cc
index ae9d4a3e..3c1abf03 100644
--- a/src/BtKeepAliveMessage.cc
+++ b/src/BtKeepAliveMessage.cc
@@ -36,13 +36,13 @@
 
 uint32_t BtKeepAliveMessage::MESSAGE_LENGTH = 4;
 
-const char* BtKeepAliveMessage::getMessage() {
+const unsigned char* BtKeepAliveMessage::getMessage() {
   if(!msg) {
     /**
      * len --- 0, 4bytes
      * total: 4bytes
      */
-    msg = new char[MESSAGE_LENGTH];
+    msg = new unsigned char[MESSAGE_LENGTH];
     memset(msg, 0, MESSAGE_LENGTH);
   }
   return msg;
diff --git a/src/BtKeepAliveMessage.h b/src/BtKeepAliveMessage.h
index 9044dfe9..f9080741 100644
--- a/src/BtKeepAliveMessage.h
+++ b/src/BtKeepAliveMessage.h
@@ -43,7 +43,7 @@ typedef SharedHandle<BtKeepAliveMessage> BtKeepAliveMessageHandle;
 
 class BtKeepAliveMessage : public SimpleBtMessage {
 private:
-  char* msg;
+  unsigned char* msg;
 
   static uint32_t MESSAGE_LENGTH;
 public:
@@ -57,11 +57,11 @@ public:
     ID = 99
   };
 
-  virtual int32_t getId() const { return ID; }
+  virtual uint8_t getId() const { return ID; }
 
   virtual void doReceivedAction() {}
 
-  virtual const char* getMessage();
+  virtual const unsigned char* getMessage();
 
   virtual uint32_t getMessageLength();
 
diff --git a/src/BtMessage.h b/src/BtMessage.h
index 0a135fec..6025343d 100644
--- a/src/BtMessage.h
+++ b/src/BtMessage.h
@@ -50,7 +50,7 @@ public:
 
   virtual bool isUploading() = 0;
 
-  virtual int32_t getId() = 0;
+  virtual uint8_t getId() = 0;
 
   virtual void doReceivedAction() = 0;
 
diff --git a/src/BtMessageDispatcher.h b/src/BtMessageDispatcher.h
index 7f3ebec2..356b8bfa 100644
--- a/src/BtMessageDispatcher.h
+++ b/src/BtMessageDispatcher.h
@@ -50,7 +50,7 @@ public:
 
   virtual void sendMessages() = 0;
 
-  virtual void doCancelSendingPieceAction(uint32_t index, uint32_t begin, uint32_t blockLength) = 0;
+  virtual void doCancelSendingPieceAction(int32_t index, int32_t begin, uint32_t length) = 0;
 
   virtual void doCancelSendingPieceAction(const PieceHandle& piece) = 0;
 
@@ -68,9 +68,9 @@ public:
 
   virtual uint32_t countOutstandingRequest() = 0;
 
-  virtual bool isOutstandingRequest(uint32_t index, uint32_t blockIndex) = 0;
+  virtual bool isOutstandingRequest(int32_t index, int32_t blockIndex) = 0;
 
-  virtual RequestSlot getOutstandingRequest(uint32_t index, uint32_t begin, uint32_t blockLength) = 0;
+  virtual RequestSlot getOutstandingRequest(int32_t index, int32_t begin, uint32_t length) = 0;
 
   virtual void removeOutstandingRequest(const RequestSlot& slot) = 0;
 
diff --git a/src/BtMessageFactory.h b/src/BtMessageFactory.h
index 1dd73afa..4db24a5a 100644
--- a/src/BtMessageFactory.h
+++ b/src/BtMessageFactory.h
@@ -54,15 +54,15 @@ public:
 			 const unsigned char* peerId) = 0;
 
   virtual BtMessageHandle
-  createRequestMessage(const PieceHandle& piece, uint32_t blockIndex) = 0;
+  createRequestMessage(const PieceHandle& piece, int32_t blockIndex) = 0;
 
   virtual BtMessageHandle
-  createCancelMessage(uint32_t index, uint32_t begin, uint32_t length) = 0;
+  createCancelMessage(int32_t index, int32_t begin, uint32_t length) = 0;
 
   virtual BtMessageHandle
-  createPieceMessage(uint32_t index, uint32_t begin, uint32_t length) = 0;
+  createPieceMessage(int32_t index, int32_t begin, uint32_t length) = 0;
 
-  virtual BtMessageHandle createHaveMessage(uint32_t index) = 0;
+  virtual BtMessageHandle createHaveMessage(int32_t index) = 0;
 
   virtual BtMessageHandle createChokeMessage() = 0;
 
@@ -81,9 +81,9 @@ public:
   virtual BtMessageHandle createHaveNoneMessage() = 0;
 
   virtual BtMessageHandle
-  createRejectMessage(uint32_t index, uint32_t begin, uint32_t length) = 0;
+  createRejectMessage(int32_t index, int32_t begin, uint32_t length) = 0;
 
-  virtual BtMessageHandle createAllowedFastMessage(uint32_t index) = 0;
+  virtual BtMessageHandle createAllowedFastMessage(int32_t index) = 0;
 };
 
 typedef SharedHandle<BtMessageFactory> BtMessageFactoryHandle;
diff --git a/src/BtNotInterestedMessage.cc b/src/BtNotInterestedMessage.cc
index 4d3fc4eb..9bf83e66 100644
--- a/src/BtNotInterestedMessage.cc
+++ b/src/BtNotInterestedMessage.cc
@@ -40,7 +40,7 @@ BtNotInterestedMessageHandle BtNotInterestedMessage::create(const unsigned char*
   if(dataLength != 1) {
     throw new DlAbortEx("invalid payload size for %s, size = %d. It should be %d", "not interested", dataLength, 1);
   }
-  int32_t id = PeerMessageUtil::getId(data);
+  uint8_t id = PeerMessageUtil::getId(data);
   if(id != ID) {
     throw new DlAbortEx("invalid ID=%d for %s. It should be %d.",
 			id, "not interested", ID);
@@ -59,14 +59,14 @@ bool BtNotInterestedMessage::sendPredicate() const {
 
 uint32_t BtNotInterestedMessage::MESSAGE_LENGTH = 5;
 
-const char* BtNotInterestedMessage::getMessage() {
+const unsigned char* BtNotInterestedMessage::getMessage() {
   if(!msg) {
     /**
      * len --- 1, 4bytes
      * id --- 3, 1byte
      * total: 5bytes
      */
-    msg = new char[MESSAGE_LENGTH];
+    msg = new unsigned char[MESSAGE_LENGTH];
     PeerMessageUtil::createPeerMessageString(msg, MESSAGE_LENGTH, 1, ID);
   }
   return msg;
diff --git a/src/BtNotInterestedMessage.h b/src/BtNotInterestedMessage.h
index f7cbee5a..35d6372a 100644
--- a/src/BtNotInterestedMessage.h
+++ b/src/BtNotInterestedMessage.h
@@ -43,7 +43,7 @@ typedef SharedHandle<BtNotInterestedMessage> BtNotInterestedMessageHandle;
 
 class BtNotInterestedMessage : public SimpleBtMessage {
 private:
-  char* msg;
+  unsigned char* msg;
   
   static uint32_t MESSAGE_LENGTH;
 public:
@@ -59,11 +59,11 @@ public:
 
   static BtNotInterestedMessageHandle create(const unsigned char* data, uint32_t dataLength);
 
-  virtual int32_t getId() const { return ID; }
+  virtual uint8_t getId() const { return ID; }
 
   virtual void doReceivedAction();
 
-  virtual const char* getMessage();
+  virtual const unsigned char* getMessage();
 
   virtual uint32_t getMessageLength();
 
diff --git a/src/BtPieceMessage.cc b/src/BtPieceMessage.cc
index a9bdb758..4f62f663 100644
--- a/src/BtPieceMessage.cc
+++ b/src/BtPieceMessage.cc
@@ -43,17 +43,17 @@
 void BtPieceMessage::setBlock(const unsigned char* block, uint32_t blockLength) {
   delete [] this->block;
   this->blockLength = blockLength;
-  this->block = new char[this->blockLength];
+  this->block = new unsigned char[this->blockLength];
   memcpy(this->block, block, this->blockLength);
 }
 
 BtPieceMessageHandle BtPieceMessage::create(const unsigned char* data, uint32_t dataLength) {
   if(dataLength <= 9) {
-    throw new DlAbortEx("invalid payload size for %s, size = %d. It should be greater than %d", "piece", dataLength, 9);
+    throw new DlAbortEx("invalid payload size for %s, size = %u. It should be greater than %d", "piece", dataLength, 9);
   }
-  int32_t id = PeerMessageUtil::getId(data);
+  uint8_t id = PeerMessageUtil::getId(data);
   if(id != ID) {
-    throw new DlAbortEx("invalid ID=%d for %s. It should be %d.",
+    throw new DlAbortEx("invalid ID=%u for %s. It should be %d.",
 			id, "piece", ID);
   }
   BtPieceMessageHandle message = new BtPieceMessage();
@@ -73,9 +73,9 @@ void BtPieceMessage::doReceivedAction() {
     peer->snubbing = false;
     peer->updateLatency(slot.getLatencyInMillis());
     PieceHandle piece = pieceStorage->getPiece(index);
-    uint64_t offset =
-      ((uint64_t)index)*btContext->getPieceLength()+begin;
-    logger->debug("CUID#%d - Piece received. index=%u, begin=%u, length=%u, offset=%llu, blockIndex=%u",
+    int64_t offset =
+      ((int64_t)index)*btContext->getPieceLength()+begin;
+    logger->debug("CUID#%d - Piece received. index=%d, begin=%d, length=%u, offset=%llu, blockIndex=%u",
 		  cuid, index, begin, blockLength, offset, slot.getBlockIndex());
     pieceStorage->getDiskAdaptor()->writeData(block,
 					      blockLength,
@@ -94,7 +94,7 @@ void BtPieceMessage::doReceivedAction() {
 
 uint32_t BtPieceMessage::MESSAGE_HEADER_LENGTH = 13;
 
-const char* BtPieceMessage::getMessageHeader() {
+const unsigned char* BtPieceMessage::getMessageHeader() {
   if(!msgHeader) {
     /**
      * len --- 9+blockLength, 4bytes
@@ -103,7 +103,7 @@ const char* BtPieceMessage::getMessageHeader() {
      * begin --- begin, 4bytes
      * total: 13bytes
      */
-    msgHeader = new char[MESSAGE_HEADER_LENGTH];
+    msgHeader = new unsigned char[MESSAGE_HEADER_LENGTH];
     PeerMessageUtil::createPeerMessageString(msgHeader, MESSAGE_HEADER_LENGTH,
 					     9+blockLength, ID);
     PeerMessageUtil::setIntParam(&msgHeader[5], index);
@@ -141,8 +141,8 @@ void BtPieceMessage::send() {
   }
   if(headerSent) {
     sendingInProgress = false;
-    uint64_t pieceDataOffset =
-      ((uint64_t)index)*btContext->getPieceLength()+begin+blockLength-leftDataLength;
+    int64_t pieceDataOffset =
+      ((int64_t)index)*btContext->getPieceLength()+begin+blockLength-leftDataLength;
     uint32_t writtenLength =
       sendPieceData(pieceDataOffset, leftDataLength);
     peer->updateUploadLength(writtenLength);
@@ -153,13 +153,13 @@ void BtPieceMessage::send() {
   }
 }
 
-uint32_t BtPieceMessage::sendPieceData(uint64_t offset, uint32_t length) const {
+uint32_t BtPieceMessage::sendPieceData(int64_t offset, uint32_t length) const {
   uint32_t BUF_SIZE = 256;
-  char buf[BUF_SIZE];
+  unsigned char buf[BUF_SIZE];
   int32_t iteration = length/BUF_SIZE;
   uint32_t writtenLength = 0;
   for(int32_t i = 0; i < iteration; i++) {
-    if(pieceStorage->getDiskAdaptor()->readData(buf, BUF_SIZE, offset+i*BUF_SIZE) < BUF_SIZE) {
+    if(pieceStorage->getDiskAdaptor()->readData(buf, BUF_SIZE, offset+i*BUF_SIZE) < (int32_t)BUF_SIZE) {
       throw new DlAbortEx("Failed to read data from disk.");
     }
     uint32_t ws = PEER_CONNECTION(btContext, peer)->sendMessage(buf, BUF_SIZE);
@@ -181,13 +181,13 @@ uint32_t BtPieceMessage::sendPieceData(uint64_t offset, uint32_t length) const {
 }
 
 string BtPieceMessage::toString() const {
-  return "piece index="+Util::uitos(index)+", begin="+Util::uitos(begin)+
+  return "piece index="+Util::itos(index)+", begin="+Util::itos(begin)+
     ", length="+Util::uitos(blockLength);
 }
 
 bool BtPieceMessage::checkPieceHash(const PieceHandle& piece) {
-  uint64_t offset =
-    ((uint64_t)piece->getIndex())*btContext->getPieceLength();
+  int64_t offset =
+    ((int64_t)piece->getIndex())*btContext->getPieceLength();
   return pieceStorage->getDiskAdaptor()->sha1Sum(offset, piece->getLength()) ==
     btContext->getPieceHash(piece->getIndex());
 }
@@ -207,10 +207,10 @@ void BtPieceMessage::onWrongPiece(const PieceHandle& piece) {
 
 void BtPieceMessage::erasePieceOnDisk(const PieceHandle& piece) {
   int32_t BUFSIZE = 4096;
-  char buf[BUFSIZE];
+  unsigned char buf[BUFSIZE];
   memset(buf, 0, BUFSIZE);
-  uint64_t offset =
-    ((uint64_t)piece->getIndex())*btContext->getPieceLength();
+  int64_t offset =
+    ((int64_t)piece->getIndex())*btContext->getPieceLength();
   for(int32_t i = 0; i < piece->getLength()/BUFSIZE; i++) {
     pieceStorage->getDiskAdaptor()->writeData(buf, BUFSIZE, offset);
     offset += BUFSIZE;
@@ -269,7 +269,7 @@ void BtPieceMessage::handleCancelSendingPieceEvent(const BtEventHandle& event) {
      begin == intEvent->getBegin() &&
      blockLength == intEvent->getLength()) {
     logger->debug("CUID#%d - Reject piece message in queue because cancel"
-		  " message received. index=%d, begin=%d, length=%d",
+		  " message received. index=%d, begin=%d, length=%u",
 		  cuid, index, begin, blockLength);
     if(peer->isFastExtensionEnabled()) {
       BtMessageHandle rej =
diff --git a/src/BtPieceMessage.h b/src/BtPieceMessage.h
index d1677369..c1bdf549 100644
--- a/src/BtPieceMessage.h
+++ b/src/BtPieceMessage.h
@@ -47,13 +47,13 @@ typedef SharedHandle<BtPieceMessage> BtPieceMessageHandle;
 
 class BtPieceMessage : public AbstractBtMessage {
 private:
-  uint32_t index;
-  uint32_t begin;
+  int32_t index;
+  int32_t begin;
   uint32_t blockLength;
-  char* block;
+  unsigned char* block;
   uint32_t leftDataLength;
   bool headerSent;
-  char* msgHeader;
+  unsigned char* msgHeader;
 
   static uint32_t MESSAGE_HEADER_LENGTH;
 
@@ -65,7 +65,7 @@ private:
 
   void erasePieceOnDisk(const PieceHandle& piece);
 
-  uint32_t sendPieceData(uint64_t offset, uint32_t length) const;
+  uint32_t sendPieceData(int64_t offset, uint32_t length) const;
 
   class BtChokingEventListener : public AbstractBtEventListener {
   private:
@@ -93,7 +93,7 @@ private:
 
   typedef SharedHandle<BtCancelSendingPieceEventListener> BtCancelSendingPieceEventListenerHandle;
 public:
-  BtPieceMessage(uint32_t index = 0, uint32_t begin = 0, uint32_t blockLength = 0)
+  BtPieceMessage(int32_t index = 0, int32_t begin = 0, uint32_t blockLength = 0)
     :index(index),
      begin(begin),
      blockLength(blockLength),
@@ -116,15 +116,15 @@ public:
     ID = 7
   };
 
-  uint32_t getIndex() const { return index; }
+  int32_t getIndex() const { return index; }
 
-  void setIndex(uint32_t index) { this->index = index; }
+  void setIndex(int32_t index) { this->index = index; }
 
-  uint32_t getBegin() const { return begin; }
+  int32_t getBegin() const { return begin; }
 
-  void setBegin(uint32_t begin) { this->begin = begin; }
+  void setBegin(int32_t begin) { this->begin = begin; }
 
-  const char* getBlock() const { return block; }
+  const unsigned char* getBlock() const { return block; }
 
   void setBlock(const unsigned char* block, uint32_t blockLength);
 
@@ -134,11 +134,11 @@ public:
 
   static BtPieceMessageHandle create(const unsigned char* data, uint32_t dataLength);
 
-  virtual int32_t getId() const { return ID; }
+  virtual uint8_t getId() const { return ID; }
 
   virtual void doReceivedAction();
 
-  const char* getMessageHeader();
+  const unsigned char* getMessageHeader();
 
   uint32_t getMessageHeaderLength();
 
diff --git a/src/BtPortMessage.cc b/src/BtPortMessage.cc
index 29ffc761..b9d0d9f6 100644
--- a/src/BtPortMessage.cc
+++ b/src/BtPortMessage.cc
@@ -41,7 +41,7 @@ BtPortMessageHandle BtPortMessage::create(const unsigned char* data, uint32_t da
   if(dataLength != 3) {
     throw new DlAbortEx("invalid payload size for %s, size = %d. It should be %d", "port", dataLength, 3);
   }
-  int32_t id = PeerMessageUtil::getId(data);
+  uint8_t id = PeerMessageUtil::getId(data);
   if(id != ID) {
     throw new DlAbortEx("invalid ID=%d for %s. It should be %d.",
 			id, "piece", ID);
diff --git a/src/BtPortMessage.h b/src/BtPortMessage.h
index 43f4be34..6a487b82 100644
--- a/src/BtPortMessage.h
+++ b/src/BtPortMessage.h
@@ -57,7 +57,7 @@ public:
 
   void setPort(uint16_t port) { this->port = port; }
 
-  virtual int32_t getId() const { return ID; }
+  virtual uint8_t getId() const { return ID; }
 
   static BtPortMessageHandle create(const unsigned char* data, uint32_t dataLength);
 
diff --git a/src/BtRejectMessage.cc b/src/BtRejectMessage.cc
index e6438c96..fd2b3899 100644
--- a/src/BtRejectMessage.cc
+++ b/src/BtRejectMessage.cc
@@ -39,11 +39,11 @@
 
 BtRejectMessageHandle BtRejectMessage::create(const unsigned char* data, uint32_t dataLength) {
   if(dataLength != 13) {
-    throw new DlAbortEx("invalid payload size for %s, size = %d. It should be %d", "reject", dataLength, 13);
+    throw new DlAbortEx("invalid payload size for %s, size = %u. It should be %d", "reject", dataLength, 13);
   }
-  int32_t id = PeerMessageUtil::getId(data);
+  uint8_t id = PeerMessageUtil::getId(data);
   if(id != ID) {
-    throw new DlAbortEx("invalid ID=%d for %s. It should be %d.",
+    throw new DlAbortEx("invalid ID=%u for %s. It should be %d.",
 			id, "reject", ID);
   }
   BtRejectMessageHandle message = new BtRejectMessage();
@@ -72,7 +72,7 @@ void BtRejectMessage::doReceivedAction() {
 
 uint32_t BtRejectMessage::MESSAGE_LENGTH = 17;
 
-const char* BtRejectMessage::getMessage() {
+const unsigned char* BtRejectMessage::getMessage() {
   if(!msg) {
     /**
      * len --- 13, 4bytes
@@ -82,7 +82,7 @@ const char* BtRejectMessage::getMessage() {
      * length -- length, 4bytes
      * total: 17bytes
      */
-    msg = new char[MESSAGE_LENGTH];
+    msg = new unsigned char[MESSAGE_LENGTH];
     PeerMessageUtil::createPeerMessageString(msg, MESSAGE_LENGTH, 13, ID);
     PeerMessageUtil::setIntParam(&msg[5], index);
     PeerMessageUtil::setIntParam(&msg[9], begin);
@@ -96,6 +96,6 @@ uint32_t BtRejectMessage::getMessageLength() {
 }
 
 string BtRejectMessage::toString() const {
-  return "reject index="+Util::uitos(index)+", begin="+Util::uitos(begin)+
+  return "reject index="+Util::itos(index)+", begin="+Util::itos(begin)+
     ", length="+Util::uitos(length);
 }
diff --git a/src/BtRejectMessage.h b/src/BtRejectMessage.h
index 4e081a6d..f79ee9dd 100644
--- a/src/BtRejectMessage.h
+++ b/src/BtRejectMessage.h
@@ -43,13 +43,13 @@ typedef SharedHandle<BtRejectMessage> BtRejectMessageHandle;
 
 class BtRejectMessage : public SimpleBtMessage {
 private:
-  uint32_t index;
-  uint32_t begin;
+  int32_t index;
+  int32_t begin;
   uint32_t length;
-  char* msg;
+  unsigned char* msg;
   static uint32_t MESSAGE_LENGTH;
 public:
-  BtRejectMessage(uint32_t index = 0, uint32_t begin = 0, uint32_t length = 0)
+  BtRejectMessage(int32_t index = 0, int32_t begin = 0, uint32_t length = 0)
     :index(index),
      begin(begin),
      length(length),
@@ -63,22 +63,22 @@ public:
     ID = 16
   };
 
-  uint32_t getIndex() const { return index; }
-  void setIndex(uint32_t index) { this->index = index; }
+  int32_t getIndex() const { return index; }
+  void setIndex(int32_t index) { this->index = index; }
 
-  uint32_t getBegin() const { return begin; }
-  void setBegin(uint32_t begin) { this->begin = begin; }
+  int32_t getBegin() const { return begin; }
+  void setBegin(int32_t begin) { this->begin = begin; }
 
   uint32_t getLength() const { return length; }
   void setLength(uint32_t length) { this->length = length; }
 
   static BtRejectMessageHandle create(const unsigned char* data, uint32_t dataLength);
 
-  virtual int32_t getId() const { return ID; }
+  virtual uint8_t getId() const { return ID; }
 
   virtual void doReceivedAction();
 
-  virtual const char* getMessage();
+  virtual const unsigned char* getMessage();
 
   virtual uint32_t getMessageLength();
 
diff --git a/src/BtRequestFactory.h b/src/BtRequestFactory.h
index f68d0e77..ff7d281f 100644
--- a/src/BtRequestFactory.h
+++ b/src/BtRequestFactory.h
@@ -58,13 +58,13 @@ public:
    * addTargetPiece() and returns them.
    * The number of objects returned is capped by max.
    */
-  virtual BtMessages createRequestMessages(int max) = 0;
+  virtual BtMessages createRequestMessages(uint32_t max) = 0;
 
   /**
    * Use this method in end game mode.
    *
    */
-  virtual BtMessages createRequestMessagesOnEndGame(int max) = 0;
+  virtual BtMessages createRequestMessagesOnEndGame(uint32_t max) = 0;
 };
 
 typedef SharedHandle<BtRequestFactory> BtRequestFactoryHandle;
diff --git a/src/BtRequestMessage.cc b/src/BtRequestMessage.cc
index b3d5a21b..ba7164f4 100644
--- a/src/BtRequestMessage.cc
+++ b/src/BtRequestMessage.cc
@@ -40,9 +40,9 @@
 
 BtRequestMessageHandle BtRequestMessage::create(const unsigned char* data, uint32_t dataLength) {
   if(dataLength != 13) {
-    throw new DlAbortEx("invalid payload size for %s, size = %d. It should be %d", "request", dataLength, 13);
+    throw new DlAbortEx("invalid payload size for %s, size = %u. It should be %d", "request", dataLength, 13);
   }
-  int32_t id = PeerMessageUtil::getId(data);
+  uint8_t id = PeerMessageUtil::getId(data);
   if(id != ID) {
     throw new DlAbortEx("invalid ID=%d for %s. It should be %d.",
 			id, "request", ID);
@@ -76,7 +76,7 @@ void BtRequestMessage::doReceivedAction() {
 
 uint32_t BtRequestMessage::MESSAGE_LENGTH = 17;
 
-const char* BtRequestMessage::getMessage() {
+const unsigned char* BtRequestMessage::getMessage() {
   if(!msg) {
     /**
      * len --- 13, 4bytes
@@ -86,7 +86,7 @@ const char* BtRequestMessage::getMessage() {
      * length --- length, 4bytes
      * total: 17bytes
      */
-    msg = new char[MESSAGE_LENGTH];
+    msg = new unsigned char[MESSAGE_LENGTH];
     PeerMessageUtil::createPeerMessageString(msg, MESSAGE_LENGTH, 13, ID);
     PeerMessageUtil::setIntParam(&msg[5], index);
     PeerMessageUtil::setIntParam(&msg[9], begin);
@@ -100,7 +100,7 @@ uint32_t BtRequestMessage::getMessageLength() {
 }
 
 string BtRequestMessage::toString() const {
-  return "request index="+Util::uitos(index)+", begin="+Util::uitos(begin)+
+  return "request index="+Util::itos(index)+", begin="+Util::itos(begin)+
     ", length="+Util::uitos(length);
 }
 
diff --git a/src/BtRequestMessage.h b/src/BtRequestMessage.h
index f41b8882..100c8235 100644
--- a/src/BtRequestMessage.h
+++ b/src/BtRequestMessage.h
@@ -46,11 +46,11 @@ typedef SharedHandle<BtRequestMessage> BtRequestMessageHandle;
 
 class BtRequestMessage : public SimpleBtMessage {
 private:
-  uint32_t index;
-  uint32_t begin;
+  int32_t index;
+  int32_t begin;
   uint32_t length;
-  uint32_t blockIndex;
-  char* msg;
+  int32_t blockIndex;
+  unsigned char* msg;
 
   static uint32_t MESSAGE_LENGTH;
 
@@ -67,10 +67,10 @@ private:
 
   typedef SharedHandle<BtAbortOutstandingRequestEventListener> BtAbortOutstandingRequestEventListenerHandle;
 public:
-  BtRequestMessage(uint32_t index = 0,
-		   uint32_t begin = 0,
+  BtRequestMessage(int32_t index = 0,
+		   int32_t begin = 0,
 		   uint32_t length = 0,
-		   uint32_t blockIndex = 0)
+		   int32_t blockIndex = 0)
     :index(index),
      begin(begin),
      length(length),
@@ -88,22 +88,25 @@ public:
     ID = 6
   };
 
-  uint32_t getIndex() const { return index; }
-  void setIndex(uint32_t index) { this->index = index; }
-  uint32_t getBegin() const { return begin; }
-  void setBegin(uint32_t begin) { this->begin = begin; }
+  int32_t getIndex() const { return index; }
+  void setIndex(int32_t index) { this->index = index; }
+
+  int32_t getBegin() const { return begin; }
+  void setBegin(int32_t begin) { this->begin = begin; }
+
   uint32_t getLength() const { return length; }
   void setLength(uint32_t length) { this->length = length; }
-  uint32_t getBlockIndex() const { return blockIndex; }
-  void setBlockIndex(uint32_t blockIndex) { this->blockIndex = blockIndex; }
+
+  int32_t getBlockIndex() const { return blockIndex; }
+  void setBlockIndex(int32_t blockIndex) { this->blockIndex = blockIndex; }
 
   static BtRequestMessageHandle create(const unsigned char* data, uint32_t dataLength);
 
-  virtual int32_t getId() const { return ID; }
+  virtual uint8_t getId() const { return ID; }
 
   virtual void doReceivedAction();
 
-  virtual const char* getMessage();
+  virtual const unsigned char* getMessage();
 
   virtual uint32_t getMessageLength();
 
diff --git a/src/BtSuggestPieceMessage.cc b/src/BtSuggestPieceMessage.cc
index fd68d3e6..79ce496c 100644
--- a/src/BtSuggestPieceMessage.cc
+++ b/src/BtSuggestPieceMessage.cc
@@ -39,11 +39,11 @@
 
 BtSuggestPieceMessageHandle BtSuggestPieceMessage::create(const unsigned char* data, uint32_t dataLength) {
   if(dataLength != 5) {
-    throw new DlAbortEx("invalid payload size for %s, size = %d. It should be %d", "suggest piece", dataLength, 5);
+    throw new DlAbortEx("invalid payload size for %s, size = %u. It should be %d", "suggest piece", dataLength, 5);
   }
-  int32_t id = PeerMessageUtil::getId(data);
+  uint8_t id = PeerMessageUtil::getId(data);
   if(id != ID) {
-    throw new DlAbortEx("invalid ID=%d for %s. It should be %d.",
+    throw new DlAbortEx("invalid ID=%u for %s. It should be %d.",
 			id, "suggest piece", ID);
   }
   BtSuggestPieceMessageHandle message = new BtSuggestPieceMessage();
@@ -53,7 +53,7 @@ BtSuggestPieceMessageHandle BtSuggestPieceMessage::create(const unsigned char* d
 
 uint32_t BtSuggestPieceMessage::MESSAGE_LENGTH = 9;
 
-const char* BtSuggestPieceMessage::getMessage() {
+const unsigned char* BtSuggestPieceMessage::getMessage() {
   if(!msg) {
     /**
      * len --- 5, 4bytes
@@ -61,7 +61,7 @@ const char* BtSuggestPieceMessage::getMessage() {
      * piece index --- index, 4bytes
      * total: 9bytes
      */
-    msg = new char[MESSAGE_LENGTH];
+    msg = new unsigned char[MESSAGE_LENGTH];
     PeerMessageUtil::createPeerMessageString(msg, MESSAGE_LENGTH, 5, ID);
     PeerMessageUtil::setIntParam(&msg[5], index);
   }
@@ -73,5 +73,5 @@ uint32_t BtSuggestPieceMessage::getMessageLength() {
 }
 
 string BtSuggestPieceMessage::toString() const {
-  return "suggest piece index="+Util::uitos(index);
+  return "suggest piece index="+Util::itos(index);
 }
diff --git a/src/BtSuggestPieceMessage.h b/src/BtSuggestPieceMessage.h
index 5143a74a..00a906af 100644
--- a/src/BtSuggestPieceMessage.h
+++ b/src/BtSuggestPieceMessage.h
@@ -43,8 +43,8 @@ typedef SharedHandle<BtSuggestPieceMessage> BtSuggestPieceMessageHandle;
 
 class BtSuggestPieceMessage : public SimpleBtMessage {
 private:
-  uint32_t index;
-  char* msg;
+  int32_t index;
+  unsigned char* msg;
   static uint32_t MESSAGE_LENGTH;
 public:
   BtSuggestPieceMessage():index(0), msg(0) {}
@@ -57,21 +57,21 @@ public:
     ID = 13
   };
 
-  void setIndex(uint32_t index) {
+  void setIndex(int32_t index) {
     this->index = index;
   }
 
-  uint32_t getIndex() const { return index; }
+  int32_t getIndex() const { return index; }
 
   static BtSuggestPieceMessageHandle create(const unsigned char* data, uint32_t dataLength);
 
-  virtual int32_t getId() const { return ID; }
+  virtual uint8_t getId() const { return ID; }
 
   virtual void doReceivedAction() {
     // TODO Current implementation ignores this message.
   }
 
-  virtual const char* getMessage();
+  virtual const unsigned char* getMessage();
 
   virtual uint32_t getMessageLength();
 
diff --git a/src/BtUnchokeMessage.cc b/src/BtUnchokeMessage.cc
index e96d9d96..8a4964ad 100644
--- a/src/BtUnchokeMessage.cc
+++ b/src/BtUnchokeMessage.cc
@@ -40,7 +40,7 @@ BtUnchokeMessageHandle BtUnchokeMessage::create(const unsigned char* data, uint3
   if(dataLength != 1) {
     throw new DlAbortEx("invalid payload size for %s, size = %d. It should be %d", "unchoke", dataLength, 1);
   }
-  int32_t id = PeerMessageUtil::getId(data);
+  uint8_t id = PeerMessageUtil::getId(data);
   if(id != ID) {
     throw new DlAbortEx("invalid ID=%d for %s. It should be %d.",
 			id, "unchoke", ID);
@@ -59,14 +59,14 @@ bool BtUnchokeMessage::sendPredicate() const {
 
 uint32_t BtUnchokeMessage::MESSAGE_LENGTH = 5;
 
-const char* BtUnchokeMessage::getMessage() {
+const unsigned char* BtUnchokeMessage::getMessage() {
   if(!msg) {
     /**
      * len --- 1, 4bytes
      * id --- 1, 1byte
      * total: 5bytes
      */
-    msg = new char[MESSAGE_LENGTH];
+    msg = new unsigned char[MESSAGE_LENGTH];
     PeerMessageUtil::createPeerMessageString(msg, MESSAGE_LENGTH, 1, ID);
   }
   return msg;
diff --git a/src/BtUnchokeMessage.h b/src/BtUnchokeMessage.h
index b673621e..06a4f82f 100644
--- a/src/BtUnchokeMessage.h
+++ b/src/BtUnchokeMessage.h
@@ -43,7 +43,7 @@ typedef SharedHandle<BtUnchokeMessage> BtUnchokeMessageHandle;
 
 class BtUnchokeMessage : public SimpleBtMessage {
 private:
-  char* msg;
+  unsigned char* msg;
   static uint32_t MESSAGE_LENGTH;
 public:
   BtUnchokeMessage():msg(0) {}
@@ -58,11 +58,11 @@ public:
 
   static BtUnchokeMessageHandle create(const unsigned char* data, uint32_t dataLength);
 
-  virtual int32_t getId() const { return ID; }
+  virtual uint8_t getId() const { return ID; }
 
   virtual void doReceivedAction();
 
-  virtual const char* getMessage();
+  virtual const unsigned char* getMessage();
 
   virtual uint32_t getMessageLength();
 
diff --git a/src/DefaultBtMessageDispatcher.cc b/src/DefaultBtMessageDispatcher.cc
index 18d0dbc0..2a47f21f 100644
--- a/src/DefaultBtMessageDispatcher.cc
+++ b/src/DefaultBtMessageDispatcher.cc
@@ -80,10 +80,10 @@ void DefaultBtMessageDispatcher::sendMessages() {
 }
 
 // Cancel sending piece message to peer.
-void DefaultBtMessageDispatcher::doCancelSendingPieceAction(uint32_t index, uint32_t begin, uint32_t blockLength)
+void DefaultBtMessageDispatcher::doCancelSendingPieceAction(int32_t index, int32_t begin, uint32_t length)
 {
   BtCancelSendingPieceEventHandle event =
-    new BtCancelSendingPieceEvent(index, begin, blockLength);
+    new BtCancelSendingPieceEvent(index, begin, length);
 
   BtMessages tempQueue = messageQueue;
   for(BtMessages::iterator itr = tempQueue.begin(); itr != tempQueue.end(); itr++) {
@@ -202,7 +202,7 @@ uint32_t DefaultBtMessageDispatcher::countOutstandingRequest()
   return requestSlots.size();
 }
 
-bool DefaultBtMessageDispatcher::isOutstandingRequest(uint32_t index, uint32_t blockIndex) {
+bool DefaultBtMessageDispatcher::isOutstandingRequest(int32_t index, int32_t blockIndex) {
   for(RequestSlots::const_iterator itr = requestSlots.begin();
       itr != requestSlots.end(); itr++) {
     const RequestSlot& slot = *itr;
diff --git a/src/DefaultBtMessageDispatcher.h b/src/DefaultBtMessageDispatcher.h
index de325f65..6bba3f33 100644
--- a/src/DefaultBtMessageDispatcher.h
+++ b/src/DefaultBtMessageDispatcher.h
@@ -82,7 +82,7 @@ public:
 
   virtual void sendMessages();
 
-  virtual void doCancelSendingPieceAction(uint32_t index, uint32_t begin, uint32_t blockLength);
+  virtual void doCancelSendingPieceAction(int32_t index, int32_t begin, uint32_t length);
 
   virtual void doCancelSendingPieceAction(const PieceHandle& piece);
 
@@ -102,14 +102,14 @@ public:
 
   virtual uint32_t countOutstandingRequest();
 
-  virtual bool isOutstandingRequest(uint32_t index, uint32_t blockIndex);
+  virtual bool isOutstandingRequest(int32_t index, int32_t blockIndex);
 
-  virtual RequestSlot getOutstandingRequest(uint32_t index, uint32_t begin, uint32_t blockLength) {
+  virtual RequestSlot getOutstandingRequest(int32_t index, int32_t begin, uint32_t length) {
     for(RequestSlots::iterator itr = requestSlots.begin();
 	itr != requestSlots.end(); itr++) {
       if(itr->getIndex() == index &&
 	 itr->getBegin() == begin &&
-	 itr->getLength() == blockLength) {
+	 itr->getLength() == length) {
 	return *itr;
       }
     }
diff --git a/src/DefaultBtMessageFactory.cc b/src/DefaultBtMessageFactory.cc
index 219635be..3e1435a2 100644
--- a/src/DefaultBtMessageFactory.cc
+++ b/src/DefaultBtMessageFactory.cc
@@ -70,7 +70,7 @@ DefaultBtMessageFactory::createBtMessage(const unsigned char* data, uint32_t dat
     // keep-alive
     msg = new BtKeepAliveMessage();
   } else {
-    int32_t id = PeerMessageUtil::getId(data);
+    uint8_t id = PeerMessageUtil::getId(data);
     switch(id) {
     case BtChokeMessage::ID:
       msg = BtChokeMessage::create(data, dataLength);
@@ -162,7 +162,7 @@ DefaultBtMessageFactory::createBtMessage(const unsigned char* data, uint32_t dat
       break;
     }
     default:
-      throw new DlAbortEx("Invalid message id. id = %d", id);
+      throw new DlAbortEx("Invalid message id. id = %u", id);
     }
   }
   setCommonProperty(msg);
@@ -201,7 +201,7 @@ DefaultBtMessageFactory::createHandshakeMessage(const unsigned char* infoHash,
 }
 
 BtMessageHandle
-DefaultBtMessageFactory::createRequestMessage(const PieceHandle& piece, uint32_t blockIndex)
+DefaultBtMessageFactory::createRequestMessage(const PieceHandle& piece, int32_t blockIndex)
 {
   BtRequestMessageHandle msg =
     new BtRequestMessage(piece->getIndex(),
@@ -218,7 +218,7 @@ DefaultBtMessageFactory::createRequestMessage(const PieceHandle& piece, uint32_t
 }
 
 BtMessageHandle
-DefaultBtMessageFactory::createCancelMessage(uint32_t index, uint32_t begin, uint32_t length)
+DefaultBtMessageFactory::createCancelMessage(int32_t index, int32_t begin, uint32_t length)
 {
   BtCancelMessageHandle msg = new BtCancelMessage(index, begin, length);
   BtMessageValidatorHandle validator =
@@ -231,7 +231,7 @@ DefaultBtMessageFactory::createCancelMessage(uint32_t index, uint32_t begin, uin
 }
 
 BtMessageHandle
-DefaultBtMessageFactory::createPieceMessage(uint32_t index, uint32_t begin, uint32_t length)
+DefaultBtMessageFactory::createPieceMessage(int32_t index, int32_t begin, uint32_t length)
 {
   BtPieceMessageHandle msg = new BtPieceMessage(index, begin, length);
   BtMessageValidatorHandle validator =
@@ -244,7 +244,7 @@ DefaultBtMessageFactory::createPieceMessage(uint32_t index, uint32_t begin, uint
 }
 
 BtMessageHandle
-DefaultBtMessageFactory::createHaveMessage(uint32_t index)
+DefaultBtMessageFactory::createHaveMessage(int32_t index)
 {
   BtHaveMessageHandle msg = new BtHaveMessage(index);
   msg->setBtMessageValidator(new BtHaveMessageValidator(msg.get(),
@@ -322,7 +322,7 @@ DefaultBtMessageFactory::createHaveNoneMessage()
 }
 
 BtMessageHandle
-DefaultBtMessageFactory::createRejectMessage(uint32_t index, uint32_t begin, uint32_t length)
+DefaultBtMessageFactory::createRejectMessage(int32_t index, int32_t begin, uint32_t length)
 {
   BtRejectMessageHandle msg = new BtRejectMessage(index, begin, length);
   BtMessageValidatorHandle validator =
@@ -335,7 +335,7 @@ DefaultBtMessageFactory::createRejectMessage(uint32_t index, uint32_t begin, uin
 }
 
 BtMessageHandle
-DefaultBtMessageFactory::createAllowedFastMessage(uint32_t index)
+DefaultBtMessageFactory::createAllowedFastMessage(int32_t index)
 {
   BtAllowedFastMessageHandle msg = new BtAllowedFastMessage(index);
   BtMessageValidatorHandle validator =
diff --git a/src/DefaultBtMessageFactory.h b/src/DefaultBtMessageFactory.h
index b0e4b14e..400fe3fa 100644
--- a/src/DefaultBtMessageFactory.h
+++ b/src/DefaultBtMessageFactory.h
@@ -73,15 +73,15 @@ public:
 			 const unsigned char* peerId);
 
   virtual BtMessageHandle
-  createRequestMessage(const PieceHandle& piece, uint32_t blockIndex);
+  createRequestMessage(const PieceHandle& piece, int32_t blockIndex);
 
   virtual BtMessageHandle
-  createCancelMessage(uint32_t index, uint32_t begin, uint32_t length);
+  createCancelMessage(int32_t index, int32_t begin, uint32_t length);
 
   virtual BtMessageHandle
-  createPieceMessage(uint32_t index, uint32_t begin, uint32_t length);
+  createPieceMessage(int32_t index, int32_t begin, uint32_t length);
 
-  virtual BtMessageHandle createHaveMessage(uint32_t index);
+  virtual BtMessageHandle createHaveMessage(int32_t index);
 
   virtual BtMessageHandle createChokeMessage();
 
@@ -100,9 +100,9 @@ public:
   virtual BtMessageHandle createHaveNoneMessage();
 
   virtual BtMessageHandle
-  createRejectMessage(uint32_t index, uint32_t begin, uint32_t length);
+  createRejectMessage(int32_t index, int32_t begin, uint32_t length);
 
-  virtual BtMessageHandle createAllowedFastMessage(uint32_t index);
+  virtual BtMessageHandle createAllowedFastMessage(int32_t index);
 
   void setPeer(const PeerHandle& peer) {
     this->peer = peer;
diff --git a/src/DefaultBtRequestFactory.cc b/src/DefaultBtRequestFactory.cc
index 657f0631..58effe0c 100644
--- a/src/DefaultBtRequestFactory.cc
+++ b/src/DefaultBtRequestFactory.cc
@@ -62,12 +62,12 @@ void DefaultBtRequestFactory::removeAllTargetPiece() {
   pieces.clear();
 }
 
-BtMessages DefaultBtRequestFactory::createRequestMessages(int max) {
+BtMessages DefaultBtRequestFactory::createRequestMessages(uint32_t max) {
   BtMessages requests;
   for(Pieces::iterator itr = pieces.begin();
       itr != pieces.end() && requests.size() < (size_t)max; itr++) {
     PieceHandle& piece = *itr;
-    int blockIndex;
+    int32_t blockIndex;
     while(requests.size() < (size_t)max &&
 	  (blockIndex = piece->getMissingUnusedBlockIndex()) != -1) {
       requests.push_back(BT_MESSAGE_FACTORY(btContext, peer)->
@@ -77,7 +77,7 @@ BtMessages DefaultBtRequestFactory::createRequestMessages(int max) {
   return requests;
 }
 
-BtMessages DefaultBtRequestFactory::createRequestMessagesOnEndGame(int max) {
+BtMessages DefaultBtRequestFactory::createRequestMessagesOnEndGame(uint32_t max) {
   BtMessages requests;
   for(Pieces::iterator itr = pieces.begin();
       itr != pieces.end() && requests.size() < (size_t)max; itr++) {
@@ -87,7 +87,7 @@ BtMessages DefaultBtRequestFactory::createRequestMessagesOnEndGame(int max) {
     for(BlockIndexes::const_iterator bitr = missingBlockIndexes.begin();
 	bitr != missingBlockIndexes.end() && requests.size() < (size_t)max;
 	bitr++) {
-      int blockIndex = *bitr;
+      int32_t blockIndex = *bitr;
       if(!dispatcher->isOutstandingRequest(piece->getIndex(),
 					   blockIndex)) {
 	requests.push_back(BT_MESSAGE_FACTORY(btContext, peer)->
diff --git a/src/DefaultBtRequestFactory.h b/src/DefaultBtRequestFactory.h
index c8c95a9a..b6c7e8de 100644
--- a/src/DefaultBtRequestFactory.h
+++ b/src/DefaultBtRequestFactory.h
@@ -46,7 +46,7 @@
 
 class DefaultBtRequestFactory : public BtRequestFactory {
 private:
-  int cuid;
+  int32_t cuid;
   BtContextHandle btContext;
   PieceStorageHandle pieceStorage;
   PeerHandle peer;
@@ -82,9 +82,9 @@ public:
 
   virtual void removeCompletedPiece();
 
-  virtual BtMessages createRequestMessages(int max);
+  virtual BtMessages createRequestMessages(uint32_t max);
 
-  virtual BtMessages createRequestMessagesOnEndGame(int max);
+  virtual BtMessages createRequestMessagesOnEndGame(uint32_t max);
 
   Pieces& getTargetPieces() {
     return pieces;
diff --git a/src/DefaultPieceStorage.h b/src/DefaultPieceStorage.h
index 2a41a4ce..4821b899 100644
--- a/src/DefaultPieceStorage.h
+++ b/src/DefaultPieceStorage.h
@@ -70,7 +70,7 @@ private:
   BitfieldMan* bitfieldMan;
   DiskAdaptor* diskAdaptor;
   Pieces usedPieces;
-  int endGamePieceNum;
+  uint32_t endGamePieceNum;
   Logger* logger;
   const Option* option;
   Haves haves;
@@ -125,11 +125,11 @@ public:
 
   virtual const unsigned char* getBitfield();
 
-  void setEndGamePieceNum(int num) {
+  void setEndGamePieceNum(uint32_t num) {
     endGamePieceNum = num;
   }
 
-  int getEndGamePieceNum() const {
+  uint32_t getEndGamePieceNum() const {
     return endGamePieceNum;
   }
 
diff --git a/src/DiskAdaptor.cc b/src/DiskAdaptor.cc
index 9044b31b..557a2f65 100644
--- a/src/DiskAdaptor.cc
+++ b/src/DiskAdaptor.cc
@@ -60,15 +60,15 @@ void DiskAdaptor::initAndOpenFile() {
   diskWriter->initAndOpenFile(getFilePath());
 }
 
-void DiskAdaptor::writeData(const char* data, int len, long long int position) {
-  diskWriter->writeData(data, len, position);
+void DiskAdaptor::writeData(const unsigned char* data, uint32_t len, int64_t offset) {
+  diskWriter->writeData(data, len, offset);
 }
 
-int DiskAdaptor::readData(char* data, int len, long long int position) {
-  return diskWriter->readData(data, len, position);
+int DiskAdaptor::readData(unsigned char* data, uint32_t len, int64_t offset) {
+  return diskWriter->readData(data, len, offset);
 }
 
-string DiskAdaptor::sha1Sum(long long int offset, long long int length) {
+string DiskAdaptor::sha1Sum(int64_t offset, uint64_t length) {
   return diskWriter->sha1Sum(offset, length);
 }
 
@@ -79,7 +79,7 @@ FileEntryHandle DiskAdaptor::getFileEntryFromPath(const string& fileEntryPath) c
       return *itr;
     }
   }
-  throw new DlAbortEx("no such file entry <%s>", fileEntryPath.c_str());
+  throw new DlAbortEx("No such file entry <%s>", fileEntryPath.c_str());
 }
 
 bool DiskAdaptor::addDownloadEntry(const string& fileEntryPath) {
diff --git a/src/DiskAdaptor.h b/src/DiskAdaptor.h
index a172cd4f..d0ddac47 100644
--- a/src/DiskAdaptor.h
+++ b/src/DiskAdaptor.h
@@ -57,9 +57,16 @@ public:
   virtual void closeFile();
   virtual void openExistingFile();
   virtual void initAndOpenFile();
-  void writeData(const char* data, int len, long long int position);
-  int readData(char* data, int len, long long int position);
-  string sha1Sum(long long int offset, long long int length);
+  void writeData(const unsigned char* data, uint32_t len, int64_t offset);
+  void writeData(const char* data, uint32_t len, int64_t offset) {
+    writeData((const unsigned char*)data, len, offset);
+  }
+  int readData(unsigned char* data, uint32_t len, int64_t offset);
+  int readData(char* data, uint32_t len, int64_t offset) {
+    return readData((unsigned char*)data, len, offset);
+  }
+
+  string sha1Sum(int64_t offset, uint64_t length);
 
   virtual void onDownloadComplete() = 0;  
 
diff --git a/src/DiskWriter.h b/src/DiskWriter.h
index daea1f3c..924b2fb0 100644
--- a/src/DiskWriter.h
+++ b/src/DiskWriter.h
@@ -79,8 +79,15 @@ public:
    * @param position the offset of this binary stream
    */
   virtual void writeData(const char* data, int len, long long int position = 0) = 0;
+  virtual void writeData(const unsigned char* data, int len, long long int position = 0)
+  {
+    writeData((const char*)data, len, position);
+  }
 
   virtual int readData(char* data, int len, long long int position) = 0;
+  virtual int readData(unsigned char* data, int len, long long int position) {
+    return readData((char*)data, len, position);
+  }
 
   virtual string sha1Sum(long long int offset, long long int length) = 0;
 
diff --git a/src/PeerConnection.h b/src/PeerConnection.h
index 5787db80..af2040e8 100644
--- a/src/PeerConnection.h
+++ b/src/PeerConnection.h
@@ -63,14 +63,8 @@ public:
   
   // Returns the number of bytes written
   uint32_t sendMessage(const unsigned char* data, uint32_t dataLength);
-  uint32_t sendMessage(const char* msg, int length) {
-    return sendMessage((const unsigned char*)msg, (uint32_t)length);
-  }
 
   bool receiveMessage(unsigned char* data, uint32_t& dataLength);
-  bool receiveMessage(char* msg, int& length) {
-    return receiveMessage((unsigned char*)msg, (uint32_t&)length);
-  }
 
   /**
    * Returns true if a handshake message is fully received, otherwise returns
@@ -79,9 +73,6 @@ public:
    * is assigned to 'length'.
    */
   bool receiveHandshake(unsigned char* data, uint32_t& dataLength);
-  bool receiveHandshake(char* msg, int& length) {
-    return receiveHandshake((unsigned char*)msg, (uint32_t&)length);
-  }
 };
 
 typedef SharedHandle<PeerConnection> PeerConnectionHandle;
diff --git a/src/PeerMessageUtil.cc b/src/PeerMessageUtil.cc
index 21bd28ec..c48f8616 100644
--- a/src/PeerMessageUtil.cc
+++ b/src/PeerMessageUtil.cc
@@ -37,8 +37,8 @@
 #include "Util.h"
 #include <netinet/in.h>
 
-int32_t PeerMessageUtil::getId(const unsigned char* msg) {
-  return (int32_t)msg[0];
+uint8_t PeerMessageUtil::getId(const unsigned char* msg) {
+  return msg[0];
 }
 
 uint32_t PeerMessageUtil::getIntParam(const unsigned char* msg, int32_t offset) {
@@ -53,14 +53,14 @@ uint16_t PeerMessageUtil::getShortIntParam(const unsigned char* msg, int32_t off
   return ntohs(nParam);
 }
 
-void PeerMessageUtil::checkIndex(uint32_t index, uint32_t pieces) {
-  if(!(0 <= index && index < pieces)) {
+void PeerMessageUtil::checkIndex(int32_t index, uint32_t pieces) {
+  if(!(0 <= index && index < (int32_t)pieces)) {
     throw new DlAbortEx("invalid index = %u", index);
   }
 }
 
-void PeerMessageUtil::checkBegin(uint32_t begin, uint32_t pieceLength) {
-  if(!(0 <= begin && begin < pieceLength)) {
+void PeerMessageUtil::checkBegin(int32_t begin, uint32_t pieceLength) {
+  if(!(0 <= begin && begin < (int32_t)pieceLength)) {
     throw new DlAbortEx("invalid begin = %u", begin);
   }  
 }
@@ -79,7 +79,7 @@ void PeerMessageUtil::checkLength(uint32_t length) {
   }
 }
 
-void PeerMessageUtil::checkRange(uint32_t begin, uint32_t length, uint32_t pieceLength) {
+void PeerMessageUtil::checkRange(int32_t begin, uint32_t length, uint32_t pieceLength) {
   if(!(0 <= begin && 0 < length)) {
     throw new DlAbortEx("invalid range, begin = %u, length = %u",
 			begin, length);
@@ -119,9 +119,9 @@ void PeerMessageUtil::setShortIntParam(unsigned char* dest, uint16_t param) {
 void PeerMessageUtil::createPeerMessageString(unsigned char* msg,
 					      uint32_t msgLength,
 					      uint32_t payloadLength,
-					      int32_t messageId) {
+					      uint8_t messageId) {
   assert(msgLength >= 5);
   memset(msg, 0, msgLength);
   setIntParam(msg, payloadLength);
-  msg[4] = (char)messageId;
+  msg[4] = messageId;
 }
diff --git a/src/PeerMessageUtil.h b/src/PeerMessageUtil.h
index a4fad679..110cef54 100644
--- a/src/PeerMessageUtil.h
+++ b/src/PeerMessageUtil.h
@@ -44,53 +44,27 @@ private:
   PeerMessageUtil() {}
 public:
   static uint32_t getIntParam(const unsigned char* msg, int32_t offset);
-  static uint32_t getIntParam(const char* msg, int32_t offset) {
-    return getIntParam((const unsigned char*)msg, offset);
-  }
 
   static uint16_t getShortIntParam(const unsigned char* msg, int32_t offset);
-  static uint16_t getShortIntParam(const char* msg, int32_t offset) {
-    return getShortIntParam((const unsigned char*)msg, offset);
-  }
 
   static void setIntParam(unsigned char* dest, uint32_t param);
-  static void setIntParam(char* dest, uint32_t param) {
-    setIntParam((unsigned char*)dest, param);
-  }
 
   static void setShortIntParam(unsigned char* dest, uint16_t param);
-  static void setShortIntParam(char* dest, uint16_t param) {
-    setShortIntParam((unsigned char*)dest, param);
-  }
 
-  static int32_t getId(const unsigned char* msg);
-  static int32_t getId(const char* msg) {
-    return getId((const unsigned char*)msg);
-  }
+  static uint8_t getId(const unsigned char* msg);
   
-  static void checkIndex(uint32_t index, uint32_t pieces);
-  static void checkBegin(uint32_t begin, uint32_t pieceLength);
+  static void checkIndex(int32_t index, uint32_t pieces);
+  static void checkBegin(int32_t begin, uint32_t pieceLength);
   static void checkLength(uint32_t length);
-  static void checkRange(uint32_t begin, uint32_t length, uint32_t pieceLength);
+  static void checkRange(int32_t begin, uint32_t length, uint32_t pieceLength);
   static void checkBitfield(const unsigned char* bitfield,
 			    uint32_t bitfieldLength,
 			    uint32_t pieces);
-  static void checkBitfield(const char* bitfield,
-			    uint32_t bitfieldLength,
-			    uint32_t pieces) {
-    checkBitfield((unsigned char*)bitfield, bitfieldLength, pieces);
-  }
 
   static void createPeerMessageString(unsigned char* msg,
 				      uint32_t msgLength,
 				      uint32_t payloadLength,
-				      int32_t messageId);
-  static void createPeerMessageString(char* msg,
-				      uint32_t msgLength,
-				      uint32_t payloadLength,
-				      int32_t messageId) {
-    createPeerMessageString((unsigned char*)msg, msgLength, payloadLength, messageId);
-  }
+				      uint8_t messageId);
 };
 
 #endif // _D_PEER_MESSAGE_UTIL_H_
diff --git a/src/RequestSlot.cc b/src/RequestSlot.cc
index 9d677bf8..6d6b4f87 100644
--- a/src/RequestSlot.cc
+++ b/src/RequestSlot.cc
@@ -35,7 +35,7 @@
 #include "RequestSlot.h"
 #include "Util.h"
 
-RequestSlot::RequestSlot(uint32_t index, uint32_t begin, uint32_t length, uint32_t blockIndex)
+RequestSlot::RequestSlot(int32_t index, int32_t begin, uint32_t length, int32_t blockIndex)
   :index(index), begin(begin), length(length), blockIndex(blockIndex) {}
 
 RequestSlot::RequestSlot(const RequestSlot& requestSlot) {
diff --git a/src/RequestSlot.h b/src/RequestSlot.h
index 20a6078d..288d555e 100644
--- a/src/RequestSlot.h
+++ b/src/RequestSlot.h
@@ -41,13 +41,13 @@
 class RequestSlot {
 private:
   Time dispatchedTime;
-  uint32_t index;
-  uint32_t begin;
+  int32_t index;
+  int32_t begin;
   uint32_t length;
-  uint32_t blockIndex;
+  int32_t blockIndex;
   void copy(const RequestSlot& requestSlot);
 public:
-  RequestSlot(uint32_t index, uint32_t begin, uint32_t length, uint32_t blockIndex);
+  RequestSlot(int32_t index, int32_t begin, uint32_t length, int32_t blockIndex);
   RequestSlot(const RequestSlot& requestSlot);
   ~RequestSlot() {}
 
@@ -70,14 +70,17 @@ public:
   bool isTimeout(time_t timeoutSec) const;
   int getLatencyInMillis() const;
 
-  uint32_t getIndex() const { return index; }
-  void setIndex(uint32_t index) { this->index = index; }
-  uint32_t getBegin() const { return begin; }
-  void setBegin(uint32_t begin) { this->begin = begin; }
+  int32_t getIndex() const { return index; }
+  void setIndex(int32_t index) { this->index = index; }
+
+  int32_t getBegin() const { return begin; }
+  void setBegin(int32_t begin) { this->begin = begin; }
+
   uint32_t getLength() const { return length; }
   void setLength(uint32_t length) { this->length = length; }
-  uint32_t getBlockIndex() const { return blockIndex; }
-  void setBlockIndex(uint32_t blockIndex) { this->blockIndex = blockIndex; }
+
+  int32_t getBlockIndex() const { return blockIndex; }
+  void setBlockIndex(int32_t blockIndex) { this->blockIndex = blockIndex; }
 
   static RequestSlot nullSlot;
 
diff --git a/src/SegmentMan.cc b/src/SegmentMan.cc
index 5d8dfe2f..efd9f2c0 100644
--- a/src/SegmentMan.cc
+++ b/src/SegmentMan.cc
@@ -363,7 +363,7 @@ bool SegmentMan::getSegment(Segment& segment, int cuid, int index) {
   if(!bitfield) {
     return onNullBitfield(segment, cuid);
   }
-  if(index < 0 || bitfield->countBlock() <= index) {
+  if(index < 0 || (int32_t)bitfield->countBlock() <= index) {
     return false;
   }
   if(bitfield->isBitSet(index) || bitfield->isUseBitSet(index)) {
diff --git a/src/SimpleBtMessage.cc b/src/SimpleBtMessage.cc
index ff08a287..a79f5091 100644
--- a/src/SimpleBtMessage.cc
+++ b/src/SimpleBtMessage.cc
@@ -45,7 +45,7 @@ void SimpleBtMessage::send() {
     return;
   }
   if(sendPredicate() || sendingInProgress) {
-    const char* msg = getMessage();
+    const unsigned char* msg = getMessage();
     int msgLength = getMessageLength();
     if(!sendingInProgress) {
       logger->info(MSG_SEND_PEER_MESSAGE,
diff --git a/src/SimpleBtMessage.h b/src/SimpleBtMessage.h
index b1a25310..ab1dc0e1 100644
--- a/src/SimpleBtMessage.h
+++ b/src/SimpleBtMessage.h
@@ -47,7 +47,7 @@ public:
 
   virtual void send();
 
-  virtual const char* getMessage() = 0;
+  virtual const unsigned char* getMessage() = 0;
 
   virtual uint32_t getMessageLength() = 0;
 
diff --git a/src/Util.cc b/src/Util.cc
index f767a163..86d1e80e 100644
--- a/src/Util.cc
+++ b/src/Util.cc
@@ -50,13 +50,9 @@
 
 
 template<typename T>
-string int2str(T value, bool comma) {
+string uint2str(T value, bool comma) {
   string str;
-  bool flag = false;
-  if(value < 0) {
-    flag = true;
-    value = -value;
-  } else if(value == 0) {
+  if(value == 0) {
     str = "0";
     return str;
   }
@@ -70,14 +66,27 @@ string int2str(T value, bool comma) {
       str.insert(str.begin()+1, ',');
     }
   }
+  return str;
+}
+
+template<typename T>
+string int2str(T value, bool comma) {
+  bool flag = false;
+  if(value < 0) {
+    flag = true;
+    value = -value;
+  }
+  string str = uint2str<T>(value, comma);
   if(flag) {
     str.insert(str.begin(), '-');
   }
   return str;
 }
 
+
+
 string Util::uitos(uint16_t value, bool comma) {
-  return int2str<uint16_t>(value, comma);
+  return uint2str<uint16_t>(value, comma);
 }
 
 string Util::itos(int16_t value, bool comma) {
@@ -85,7 +94,7 @@ string Util::itos(int16_t value, bool comma) {
 }
 
 string Util::uitos(uint32_t value, bool comma) {
-  return int2str<uint32_t>(value, comma);
+  return uint2str<uint32_t>(value, comma);
 }
 
 string Util::itos(int32_t value, bool comma) {
@@ -558,7 +567,7 @@ static int nbits[] = {
   4, 5, 5, 6, 5, 6, 6, 7, 5, 6, 6, 7, 6, 7, 7, 8, 
 };
 
-int Util::countBit(unsigned int n) {
+uint32_t Util::countBit(uint32_t n) {
   /*
   return
     nbits[n & 0xffu]+
@@ -566,8 +575,8 @@ int Util::countBit(unsigned int n) {
     nbits[(n >> 16) & 0xffu]+
     nbits[(n >> 24) & 0xffu];
   */
-  int count = 0;
-  int size = sizeof(unsigned int);
+  uint32_t count = 0;
+  int size = sizeof(uint32_t);
   for(int i = 0; i < size; i++) {
     count += nbits[(n >> i*8) & 0xffu];
   }
diff --git a/src/Util.h b/src/Util.h
index 1fdaa4c1..e6369c54 100644
--- a/src/Util.h
+++ b/src/Util.h
@@ -122,7 +122,7 @@ public:
 				int pieces, int fastSetSize);
 #endif // ENABLE_BITTORRENT
 
-  static int countBit(unsigned int);
+  static uint32_t countBit(uint32_t n);
 
   static string randomAlpha(int length);
 
diff --git a/test/BitfieldManTest.cc b/test/BitfieldManTest.cc
index e3dfff20..479ffef3 100644
--- a/test/BitfieldManTest.cc
+++ b/test/BitfieldManTest.cc
@@ -42,12 +42,12 @@ CPPUNIT_TEST_SUITE_REGISTRATION( BitfieldManTest );
 
 void BitfieldManTest::testGetBlockSize() {
   BitfieldMan bt1(1024, 1024*10);
-  CPPUNIT_ASSERT_EQUAL(1024, bt1.getBlockLength(9));
+  CPPUNIT_ASSERT_EQUAL((uint32_t)1024, bt1.getBlockLength(9));
 
   BitfieldMan bt2(1024, 1024*10+1);
-  CPPUNIT_ASSERT_EQUAL(1024, bt2.getBlockLength(9));
-  CPPUNIT_ASSERT_EQUAL(1, bt2.getBlockLength(10));
-  CPPUNIT_ASSERT_EQUAL(0, bt2.getBlockLength(11));
+  CPPUNIT_ASSERT_EQUAL((uint32_t)1024, bt2.getBlockLength(9));
+  CPPUNIT_ASSERT_EQUAL((uint32_t)1, bt2.getBlockLength(10));
+  CPPUNIT_ASSERT_EQUAL((uint32_t)0, bt2.getBlockLength(11));
 }
 
 void BitfieldManTest::testGetFirstMissingUnusedIndex() {
@@ -84,7 +84,7 @@ void BitfieldManTest::testIsAllBitSet() {
   }
   CPPUNIT_ASSERT(!bt1.isAllBitSet());
 
-  for(int i = 0; i < bt1.countBlock(); i++) {
+  for(uint32_t i = 0; i < bt1.countBlock(); i++) {
     CPPUNIT_ASSERT(bt1.setBit(i));
   }
   CPPUNIT_ASSERT(bt1.isAllBitSet());
@@ -122,7 +122,7 @@ void BitfieldManTest::testFilter() {
   index = btman.getMissingUnusedIndex(peerBt, sizeof(peerBt));
   btman.setUseBit(index);
   CPPUNIT_ASSERT_EQUAL(-1, index);
-  CPPUNIT_ASSERT_EQUAL((long long int)12, btman.getFilteredTotalLength());
+  CPPUNIT_ASSERT_EQUAL((uint64_t)12, btman.getFilteredTotalLength());
 
   // test offset=5, length=2
   btman.clearAllBit();
@@ -141,13 +141,13 @@ void BitfieldManTest::testFilter() {
   index = btman.getMissingUnusedIndex(peerBt, sizeof(peerBt));
   btman.setUseBit(index);
   CPPUNIT_ASSERT_EQUAL(-1, index);
-  CPPUNIT_ASSERT_EQUAL((long long int)4, btman.getFilteredTotalLength());
+  CPPUNIT_ASSERT_EQUAL((uint64_t)4, btman.getFilteredTotalLength());
   CPPUNIT_ASSERT(btman.isAllBitSet());
 
   BitfieldMan btman2(2, 31);
   btman2.addFilter(0, 31);
   btman2.enableFilter();
-  CPPUNIT_ASSERT_EQUAL((long long int)31, btman2.getFilteredTotalLength());
+  CPPUNIT_ASSERT_EQUAL((uint64_t)31, btman2.getFilteredTotalLength());
 
 }
 
diff --git a/test/BtAllowedFastMessageTest.cc b/test/BtAllowedFastMessageTest.cc
index 635a4389..abf787fd 100644
--- a/test/BtAllowedFastMessageTest.cc
+++ b/test/BtAllowedFastMessageTest.cc
@@ -35,8 +35,8 @@ void BtAllowedFastMessageTest::testCreate() {
   PeerMessageUtil::createPeerMessageString(msg, sizeof(msg), 5, 17);
   PeerMessageUtil::setIntParam(&msg[5], 12345);
   BtAllowedFastMessageHandle pm = BtAllowedFastMessage::create(&msg[4], 5);
-  CPPUNIT_ASSERT_EQUAL(17, pm->getId());
-  CPPUNIT_ASSERT_EQUAL((uint32_t)12345, pm->getIndex());
+  CPPUNIT_ASSERT_EQUAL((uint8_t)17, pm->getId());
+  CPPUNIT_ASSERT_EQUAL(12345, pm->getIndex());
 
   // case: payload size is wrong
   try {
diff --git a/test/BtBitfieldMessageTest.cc b/test/BtBitfieldMessageTest.cc
index d0430983..91002702 100644
--- a/test/BtBitfieldMessageTest.cc
+++ b/test/BtBitfieldMessageTest.cc
@@ -35,7 +35,7 @@ void BtBitfieldMessageTest::testCreate() {
   memset(bitfield, 0xff, sizeof(bitfield));
   memcpy(&msg[5], bitfield, sizeof(bitfield));
   BtBitfieldMessageHandle pm = BtBitfieldMessage::create(&msg[4], 3);
-  CPPUNIT_ASSERT_EQUAL(5, pm->getId());
+  CPPUNIT_ASSERT_EQUAL((uint8_t)5, pm->getId());
   CPPUNIT_ASSERT(memcmp(bitfield, pm->getBitfield(), sizeof(bitfield)) == 0);
   CPPUNIT_ASSERT_EQUAL((uint32_t)2, pm->getBitfieldLength());
   // case: payload size is wrong
diff --git a/test/BtCancelMessageTest.cc b/test/BtCancelMessageTest.cc
index cb766a47..adf82b1f 100644
--- a/test/BtCancelMessageTest.cc
+++ b/test/BtCancelMessageTest.cc
@@ -37,15 +37,15 @@ public:
 
   class MockBtMessageDispatcher2 : public MockBtMessageDispatcher {
   public:
-    uint32_t index;
-    uint32_t begin;
+    int32_t index;
+    int32_t begin;
     uint32_t length;
   public:
     MockBtMessageDispatcher2():index(0),
 			       begin(0),
 			       length(0) {}
 
-    virtual void doCancelSendingPieceAction(uint32_t index, uint32_t begin, uint32_t length) {
+    virtual void doCancelSendingPieceAction(int32_t index, int32_t begin, uint32_t length) {
       this->index = index;
       this->begin = begin;
       this->length = length;
@@ -65,9 +65,9 @@ void BtCancelMessageTest::testCreate() {
   PeerMessageUtil::setIntParam(&msg[9], 256);
   PeerMessageUtil::setIntParam(&msg[13], 1024);
   BtCancelMessageHandle pm = BtCancelMessage::create(&msg[4], 13);
-  CPPUNIT_ASSERT_EQUAL(8, pm->getId());
-  CPPUNIT_ASSERT_EQUAL((uint32_t)12345, pm->getIndex());
-  CPPUNIT_ASSERT_EQUAL((uint32_t)256, pm->getBegin());
+  CPPUNIT_ASSERT_EQUAL((uint8_t)8, pm->getId());
+  CPPUNIT_ASSERT_EQUAL(12345, pm->getIndex());
+  CPPUNIT_ASSERT_EQUAL(256, pm->getBegin());
   CPPUNIT_ASSERT_EQUAL((uint32_t)1024, pm->getLength());
 
   // case: payload size is wrong
diff --git a/test/BtChokeMessageTest.cc b/test/BtChokeMessageTest.cc
index c267d847..1a4f1684 100644
--- a/test/BtChokeMessageTest.cc
+++ b/test/BtChokeMessageTest.cc
@@ -65,7 +65,7 @@ void BtChokeMessageTest::testCreate() {
   unsigned char msg[5];
   PeerMessageUtil::createPeerMessageString(msg, sizeof(msg), 1, 0);
   BtChokeMessageHandle pm = BtChokeMessage::create(&msg[4], 1);
-  CPPUNIT_ASSERT_EQUAL(0, pm->getId());
+  CPPUNIT_ASSERT_EQUAL((uint8_t)0, pm->getId());
 
   // case: payload size is wrong
   try {
diff --git a/test/BtHandshakeMessageTest.cc b/test/BtHandshakeMessageTest.cc
index 9ccb7771..918542b6 100644
--- a/test/BtHandshakeMessageTest.cc
+++ b/test/BtHandshakeMessageTest.cc
@@ -52,7 +52,7 @@ void BtHandshakeMessageTest::testCreate() {
   unsigned char msg[68];
   createHandshakeMessageData(msg);
   BtHandshakeMessageHandle message = BtHandshakeMessage::create(&msg[0], sizeof(msg));
-  CPPUNIT_ASSERT_EQUAL(INT32_MAX, message->getId());
+  CPPUNIT_ASSERT_EQUAL((uint8_t)UINT8_MAX, message->getId());
   CPPUNIT_ASSERT_EQUAL((uint8_t)19, message->getPstrlen());
   CPPUNIT_ASSERT_EQUAL(Util::toHex((const unsigned char*)BTPSTR.c_str(), BTPSTR.size()),
 		       Util::toHex(message->getPstr(), BtHandshakeMessage::PSTR_LENGTH));
diff --git a/test/BtHaveAllMessageTest.cc b/test/BtHaveAllMessageTest.cc
index e5fe31f3..b9cec34b 100644
--- a/test/BtHaveAllMessageTest.cc
+++ b/test/BtHaveAllMessageTest.cc
@@ -29,7 +29,7 @@ void BtHaveAllMessageTest::testCreate() {
   unsigned char msg[5];
   PeerMessageUtil::createPeerMessageString(msg, sizeof(msg), 1, 14);
   BtHaveAllMessageHandle pm = BtHaveAllMessage::create(&msg[4], 1);
-  CPPUNIT_ASSERT_EQUAL(14, pm->getId());
+  CPPUNIT_ASSERT_EQUAL((uint8_t)14, pm->getId());
 
   // case: payload size is wrong
   try {
diff --git a/test/BtHaveMessageTest.cc b/test/BtHaveMessageTest.cc
index edff817b..46494b12 100644
--- a/test/BtHaveMessageTest.cc
+++ b/test/BtHaveMessageTest.cc
@@ -32,8 +32,8 @@ void BtHaveMessageTest::testCreate() {
   PeerMessageUtil::createPeerMessageString(msg, sizeof(msg), 5, 4);
   PeerMessageUtil::setIntParam(&msg[5], 12345);
   BtHaveMessageHandle pm = BtHaveMessage::create(&msg[4], 5);
-  CPPUNIT_ASSERT_EQUAL(4, pm->getId());
-  CPPUNIT_ASSERT_EQUAL((uint32_t)12345, pm->getIndex());
+  CPPUNIT_ASSERT_EQUAL((uint8_t)4, pm->getId());
+  CPPUNIT_ASSERT_EQUAL(12345, pm->getIndex());
 
   // case: payload size is wrong
   try {
diff --git a/test/BtHaveNoneMessageTest.cc b/test/BtHaveNoneMessageTest.cc
index fc78643c..c4da9e58 100644
--- a/test/BtHaveNoneMessageTest.cc
+++ b/test/BtHaveNoneMessageTest.cc
@@ -31,7 +31,7 @@ void BtHaveNoneMessageTest::testCreate() {
   unsigned char msg[5];
   PeerMessageUtil::createPeerMessageString(msg, sizeof(msg), 1, 15);
   BtHaveNoneMessageHandle pm = BtHaveNoneMessage::create(&msg[4], 1);
-  CPPUNIT_ASSERT_EQUAL(15, pm->getId());
+  CPPUNIT_ASSERT_EQUAL((uint8_t)15, pm->getId());
 
   // case: payload size is wrong
   try {
diff --git a/test/BtInterestedMessageTest.cc b/test/BtInterestedMessageTest.cc
index 5989c044..8937b906 100644
--- a/test/BtInterestedMessageTest.cc
+++ b/test/BtInterestedMessageTest.cc
@@ -33,7 +33,7 @@ void BtInterestedMessageTest::testCreate() {
   unsigned char msg[5];
   PeerMessageUtil::createPeerMessageString(msg, sizeof(msg), 1, 2);
   BtInterestedMessageHandle pm = BtInterestedMessage::create(&msg[4], 1);
-  CPPUNIT_ASSERT_EQUAL(2, pm->getId());
+  CPPUNIT_ASSERT_EQUAL((uint8_t)2, pm->getId());
 
   // case: payload size is wrong
   try {
diff --git a/test/BtNotInterestedMessageTest.cc b/test/BtNotInterestedMessageTest.cc
index c242512e..4b45917e 100644
--- a/test/BtNotInterestedMessageTest.cc
+++ b/test/BtNotInterestedMessageTest.cc
@@ -33,7 +33,7 @@ void BtNotInterestedMessageTest::testCreate() {
   unsigned char msg[5];
   PeerMessageUtil::createPeerMessageString(msg, sizeof(msg), 1, 3);
   BtNotInterestedMessageHandle pm = BtNotInterestedMessage::create(&msg[4], 1);
-  CPPUNIT_ASSERT_EQUAL(3, pm->getId());
+  CPPUNIT_ASSERT_EQUAL((uint8_t)3, pm->getId());
 
   // case: payload size is wrong
   try {
@@ -55,7 +55,7 @@ void BtNotInterestedMessageTest::testCreate() {
 
 void BtNotInterestedMessageTest::testGetMessage() {
   BtNotInterestedMessage msg;
-  char data[5];
+  unsigned char data[5];
   PeerMessageUtil::createPeerMessageString(data, sizeof(data), 1, 3);
   CPPUNIT_ASSERT(memcmp(msg.getMessage(), data, 5) == 0);
 }
diff --git a/test/BtPieceMessageTest.cc b/test/BtPieceMessageTest.cc
index 0b628108..8a396c4d 100644
--- a/test/BtPieceMessageTest.cc
+++ b/test/BtPieceMessageTest.cc
@@ -46,11 +46,11 @@ public:
 
   class MockBtMessage2 : public MockBtMessage {
   public:
-    uint32_t index;
-    uint32_t begin;
+    int32_t index;
+    int32_t begin;
     uint32_t length;
   public:
-    MockBtMessage2(uint32_t index, uint32_t begin, uint32_t length):index(index), begin(begin), length(length) {}
+    MockBtMessage2(int32_t index, int32_t begin, uint32_t length):index(index), begin(begin), length(length) {}
 
   };
 
@@ -58,8 +58,8 @@ public:
 
   class MockBtMessageFactory2 : public MockBtMessageFactory {
   public:
-    virtual BtMessageHandle createRejectMessage(uint32_t index,
-						uint32_t begin,
+    virtual BtMessageHandle createRejectMessage(int32_t index,
+						int32_t begin,
 						uint32_t length) {
       MockBtMessage2Handle msg = new MockBtMessage2(index, begin, length);
       return msg;
@@ -109,9 +109,9 @@ void BtPieceMessageTest::testCreate() {
   PeerMessageUtil::setIntParam(&msg[9], 256);
   memcpy(&msg[13], data, sizeof(data));
   BtPieceMessageHandle pm = BtPieceMessage::create(&msg[4], 11);
-  CPPUNIT_ASSERT_EQUAL(7, pm->getId());
-  CPPUNIT_ASSERT_EQUAL((uint32_t)12345, pm->getIndex());
-  CPPUNIT_ASSERT_EQUAL((uint32_t)256, pm->getBegin());
+  CPPUNIT_ASSERT_EQUAL((uint8_t)7, pm->getId());
+  CPPUNIT_ASSERT_EQUAL(12345, pm->getIndex());
+  CPPUNIT_ASSERT_EQUAL(256, pm->getBegin());
   CPPUNIT_ASSERT(memcmp(data, pm->getBlock(), sizeof(data)) == 0);
   CPPUNIT_ASSERT_EQUAL((uint32_t)2, pm->getBlockLength());
 
@@ -170,8 +170,8 @@ void BtPieceMessageTest::testChokingEvent_allowedFastEnabled() {
   CPPUNIT_ASSERT(msg->isInvalidate());  
   CPPUNIT_ASSERT_EQUAL((size_t)1, btMessageDispatcher->messageQueue.size());
   MockBtMessage2* rej = (MockBtMessage2*)btMessageDispatcher->messageQueue.front().get();
-  CPPUNIT_ASSERT_EQUAL((uint32_t)1, rej->index);
-  CPPUNIT_ASSERT_EQUAL((uint32_t)1024, rej->begin);
+  CPPUNIT_ASSERT_EQUAL(1, rej->index);
+  CPPUNIT_ASSERT_EQUAL(1024, rej->begin);
   CPPUNIT_ASSERT_EQUAL((uint32_t)16*1024, rej->length);
 }
 
@@ -255,8 +255,8 @@ void BtPieceMessageTest::testCancelSendingPieceEvent_allowedFastEnabled() {
   CPPUNIT_ASSERT(msg->isInvalidate());
   CPPUNIT_ASSERT_EQUAL((size_t)1, btMessageDispatcher->messageQueue.size());
   MockBtMessage2* rej = (MockBtMessage2*)btMessageDispatcher->messageQueue.front().get();
-  CPPUNIT_ASSERT_EQUAL((uint32_t)1, rej->index);
-  CPPUNIT_ASSERT_EQUAL((uint32_t)1024, rej->begin);
+  CPPUNIT_ASSERT_EQUAL(1, rej->index);
+  CPPUNIT_ASSERT_EQUAL(1024, rej->begin);
   CPPUNIT_ASSERT_EQUAL((uint32_t)16*1024, rej->length);
 }
 
diff --git a/test/BtPortMessageTest.cc b/test/BtPortMessageTest.cc
index a50e8382..5e1d66c4 100644
--- a/test/BtPortMessageTest.cc
+++ b/test/BtPortMessageTest.cc
@@ -29,7 +29,7 @@ void BtPortMessageTest::testCreate() {
   PeerMessageUtil::createPeerMessageString(msg, sizeof(msg), 3, 9);
   PeerMessageUtil::setShortIntParam(&msg[5], 12345);
   BtPortMessageHandle pm = BtPortMessage::create(&msg[4], 3);
-  CPPUNIT_ASSERT_EQUAL(9, pm->getId());
+  CPPUNIT_ASSERT_EQUAL((uint8_t)9, pm->getId());
   CPPUNIT_ASSERT_EQUAL((uint16_t)12345, pm->getPort());
 
   // case: payload size is wrong
diff --git a/test/BtRejectMessageTest.cc b/test/BtRejectMessageTest.cc
index 8fab5895..3746cf25 100644
--- a/test/BtRejectMessageTest.cc
+++ b/test/BtRejectMessageTest.cc
@@ -37,7 +37,7 @@ public:
       this->slot = slot;
     }
 
-    virtual RequestSlot getOutstandingRequest(uint32_t index, uint32_t begin,
+    virtual RequestSlot getOutstandingRequest(int32_t index, int32_t begin,
 					      uint32_t length) {
       if(slot.getIndex() == index && slot.getBegin() == begin &&
 	 slot.getLength() == length) {
@@ -97,9 +97,9 @@ void BtRejectMessageTest::testCreate() {
   PeerMessageUtil::setIntParam(&msg[9], 256);
   PeerMessageUtil::setIntParam(&msg[13], 1024);
   BtRejectMessageHandle pm = BtRejectMessage::create(&msg[4], 13);
-  CPPUNIT_ASSERT_EQUAL(16, pm->getId());
-  CPPUNIT_ASSERT_EQUAL((uint32_t)12345, pm->getIndex());
-  CPPUNIT_ASSERT_EQUAL((uint32_t)256, pm->getBegin());
+  CPPUNIT_ASSERT_EQUAL((uint8_t)16, pm->getId());
+  CPPUNIT_ASSERT_EQUAL(12345, pm->getIndex());
+  CPPUNIT_ASSERT_EQUAL(256, pm->getBegin());
   CPPUNIT_ASSERT_EQUAL((uint32_t)1024, pm->getLength());
 
   // case: payload size is wrong
diff --git a/test/BtRequestMessageTest.cc b/test/BtRequestMessageTest.cc
index 42a1f89b..3331a099 100644
--- a/test/BtRequestMessageTest.cc
+++ b/test/BtRequestMessageTest.cc
@@ -53,11 +53,11 @@ public:
   class MockBtMessage2 : public MockBtMessage {
   public:
     string type;
-    uint32_t index;
-    uint32_t begin;
+    int32_t index;
+    int32_t begin;
     uint32_t length;
   public:
-    MockBtMessage2(string type, uint32_t index, uint32_t begin, uint32_t length):type(type), index(index), begin(begin), length(length) {}
+    MockBtMessage2(string type, int32_t index, int32_t begin, uint32_t length):type(type), index(index), begin(begin), length(length) {}
   };
 
   typedef SharedHandle<MockBtMessage2> MockBtMessage2Handle;
@@ -65,13 +65,13 @@ public:
   class MockBtMessageFactory2 : public MockBtMessageFactory {
   public:
     virtual BtMessageHandle
-    createPieceMessage(uint32_t index, uint32_t begin, uint32_t length) {
+    createPieceMessage(int32_t index, int32_t begin, uint32_t length) {
       MockBtMessage2Handle btMsg = new MockBtMessage2("piece", index, begin, length);
       return btMsg;
     }
 
     virtual BtMessageHandle
-    createRejectMessage(uint32_t index, uint32_t begin, uint32_t length) {
+    createRejectMessage(int32_t index, int32_t begin, uint32_t length) {
       MockBtMessage2Handle btMsg = new MockBtMessage2("reject", index, begin, length);
       return btMsg;
     }
@@ -129,9 +129,9 @@ void BtRequestMessageTest::testCreate() {
   PeerMessageUtil::setIntParam(&msg[9], 256);
   PeerMessageUtil::setIntParam(&msg[13], 1024);
   BtRequestMessageHandle pm = BtRequestMessage::create(&msg[4], 13);
-  CPPUNIT_ASSERT_EQUAL(6, pm->getId());
-  CPPUNIT_ASSERT_EQUAL((uint32_t)12345, pm->getIndex());
-  CPPUNIT_ASSERT_EQUAL((uint32_t)256, pm->getBegin());
+  CPPUNIT_ASSERT_EQUAL((uint8_t)6, pm->getId());
+  CPPUNIT_ASSERT_EQUAL(12345, pm->getIndex());
+  CPPUNIT_ASSERT_EQUAL(256, pm->getBegin());
   CPPUNIT_ASSERT_EQUAL((uint32_t)1024, pm->getLength());
 
   // case: payload size is wrong
@@ -172,8 +172,8 @@ void BtRequestMessageTest::testDoReceivedAction_hasPieceAndAmNotChoking() {
   CPPUNIT_ASSERT_EQUAL((size_t)1, dispatcher->messageQueue.size());
   MockBtMessage2* pieceMsg = (MockBtMessage2*)dispatcher->messageQueue.front().get();
   CPPUNIT_ASSERT_EQUAL(string("piece"), pieceMsg->type);
-  CPPUNIT_ASSERT_EQUAL((uint32_t)1, pieceMsg->index);
-  CPPUNIT_ASSERT_EQUAL((uint32_t)16, pieceMsg->begin);
+  CPPUNIT_ASSERT_EQUAL(1, pieceMsg->index);
+  CPPUNIT_ASSERT_EQUAL(16, pieceMsg->begin);
   CPPUNIT_ASSERT_EQUAL((uint32_t)32, pieceMsg->length);
 }
 
@@ -185,8 +185,8 @@ void BtRequestMessageTest::testDoReceivedAction_hasPieceAndAmChokingAndFastExten
   CPPUNIT_ASSERT_EQUAL((size_t)1, dispatcher->messageQueue.size());
   MockBtMessage2* pieceMsg = (MockBtMessage2*)dispatcher->messageQueue.front().get();
   CPPUNIT_ASSERT_EQUAL(string("reject"), pieceMsg->type);
-  CPPUNIT_ASSERT_EQUAL((uint32_t)1, pieceMsg->index);
-  CPPUNIT_ASSERT_EQUAL((uint32_t)16, pieceMsg->begin);
+  CPPUNIT_ASSERT_EQUAL(1, pieceMsg->index);
+  CPPUNIT_ASSERT_EQUAL(16, pieceMsg->begin);
   CPPUNIT_ASSERT_EQUAL((uint32_t)32, pieceMsg->length);
 }
 
@@ -206,8 +206,8 @@ void BtRequestMessageTest::testDoReceivedAction_doesntHavePieceAndFastExtensionE
   CPPUNIT_ASSERT_EQUAL((size_t)1, dispatcher->messageQueue.size());
   MockBtMessage2* pieceMsg = (MockBtMessage2*)dispatcher->messageQueue.front().get();
   CPPUNIT_ASSERT_EQUAL(string("reject"), pieceMsg->type);
-  CPPUNIT_ASSERT_EQUAL((uint32_t)2, pieceMsg->index);
-  CPPUNIT_ASSERT_EQUAL((uint32_t)16, pieceMsg->begin);
+  CPPUNIT_ASSERT_EQUAL(2, pieceMsg->index);
+  CPPUNIT_ASSERT_EQUAL(16, pieceMsg->begin);
   CPPUNIT_ASSERT_EQUAL((uint32_t)32, pieceMsg->length);
 }
 
diff --git a/test/BtSuggestPieceMessageTest.cc b/test/BtSuggestPieceMessageTest.cc
index b62e9655..2eba021a 100644
--- a/test/BtSuggestPieceMessageTest.cc
+++ b/test/BtSuggestPieceMessageTest.cc
@@ -30,8 +30,8 @@ void BtSuggestPieceMessageTest::testCreate() {
   PeerMessageUtil::createPeerMessageString(msg, sizeof(msg), 5, 13);
   PeerMessageUtil::setIntParam(&msg[5], 12345);
   BtSuggestPieceMessageHandle pm = BtSuggestPieceMessage::create(&msg[4], 5);
-  CPPUNIT_ASSERT_EQUAL(13, pm->getId());
-  CPPUNIT_ASSERT_EQUAL((uint32_t)12345, pm->getIndex());
+  CPPUNIT_ASSERT_EQUAL((uint8_t)13, pm->getId());
+  CPPUNIT_ASSERT_EQUAL(12345, pm->getIndex());
 
   // case: payload size is wrong
   try {
diff --git a/test/BtUnchokeMessageTest.cc b/test/BtUnchokeMessageTest.cc
index 82125b4a..3134b1e8 100644
--- a/test/BtUnchokeMessageTest.cc
+++ b/test/BtUnchokeMessageTest.cc
@@ -32,7 +32,7 @@ void BtUnchokeMessageTest::testCreate() {
   unsigned char msg[5];
   PeerMessageUtil::createPeerMessageString(msg, sizeof(msg), 1, 1);
   BtUnchokeMessageHandle pm = BtUnchokeMessage::create(&msg[4], 1);
-  CPPUNIT_ASSERT_EQUAL(1, pm->getId());
+  CPPUNIT_ASSERT_EQUAL((uint8_t)1, pm->getId());
 
   // case: payload size is wrong
   try {
diff --git a/test/DefaultBtMessageDispatcherTest.cc b/test/DefaultBtMessageDispatcherTest.cc
index 6e8b9e94..a8f6f91e 100644
--- a/test/DefaultBtMessageDispatcherTest.cc
+++ b/test/DefaultBtMessageDispatcherTest.cc
@@ -122,7 +122,7 @@ public:
   class MockBtMessageFactory2 : public MockBtMessageFactory {
   public:
     virtual BtMessageHandle
-    createCancelMessage(uint32_t index, uint32_t begin, uint32_t length) {
+    createCancelMessage(int32_t index, int32_t begin, uint32_t length) {
       MockBtMessage2Handle btMsg = new MockBtMessage2();
       btMsg->type = "cancel";
       return btMsg;
diff --git a/test/DefaultBtRequestFactoryTest.cc b/test/DefaultBtRequestFactoryTest.cc
index c36d31e3..d03f95ce 100644
--- a/test/DefaultBtRequestFactoryTest.cc
+++ b/test/DefaultBtRequestFactoryTest.cc
@@ -43,14 +43,14 @@ public:
   class MockBtMessageFactory2 : public MockBtMessageFactory {
   public:
     virtual BtMessageHandle
-    createRequestMessage(const PieceHandle& piece, uint32_t blockIndex) {
+    createRequestMessage(const PieceHandle& piece, int32_t blockIndex) {
       return new MockBtRequestMessage(piece->getIndex(), blockIndex);
     }
   };
 
   class MockBtMessageDispatcher2 : public MockBtMessageDispatcher {
   public:
-    virtual bool isOutstandingRequest(uint32_t index, uint32_t blockIndex) {
+    virtual bool isOutstandingRequest(int32_t index, int32_t blockIndex) {
       return index == 0 && blockIndex == 0;
     }
   };
diff --git a/test/MockBtMessage.h b/test/MockBtMessage.h
index 63d59cb6..8550f558 100644
--- a/test/MockBtMessage.h
+++ b/test/MockBtMessage.h
@@ -42,7 +42,7 @@ private:
   bool sendingInProgress;
   bool invalidate;
   bool uploading;
-  int32_t id;
+  uint8_t id;
 public:
   MockBtMessage() {}
 
@@ -71,12 +71,12 @@ public:
   void setUploading(bool flag) {
     this->uploading = flag;
   }
-
-  virtual int32_t getId() {
+  
+  virtual uint8_t getId() {
     return id;
   }
 
-  void setId(int32_t id) {
+  void setId(uint8_t id) {
     this->id = id;
   }
 
diff --git a/test/MockBtMessageDispatcher.h b/test/MockBtMessageDispatcher.h
index 5243ef0f..f46f3684 100644
--- a/test/MockBtMessageDispatcher.h
+++ b/test/MockBtMessageDispatcher.h
@@ -19,7 +19,7 @@ public:
 
   virtual void sendMessages() {}
 
-  virtual void doCancelSendingPieceAction(uint32_t index, uint32_t begin, uint32_t blockLength) {}
+  virtual void doCancelSendingPieceAction(int32_t index, int32_t begin, uint32_t length) {}
 
   virtual void doCancelSendingPieceAction(const PieceHandle& piece) {}
 
@@ -43,11 +43,11 @@ public:
     return 0;
   }
 
-  virtual bool isOutstandingRequest(uint32_t index, uint32_t blockIndex) {
+  virtual bool isOutstandingRequest(int32_t index, int32_t blockIndex) {
     return false;
   }
 
-  virtual RequestSlot getOutstandingRequest(uint32_t index, uint32_t begin, uint32_t blockLength) {
+  virtual RequestSlot getOutstandingRequest(int32_t index, int32_t begin, uint32_t length) {
     return RequestSlot::nullSlot;
   }
 
diff --git a/test/MockBtMessageFactory.h b/test/MockBtMessageFactory.h
index 69df2ff1..3348f88b 100644
--- a/test/MockBtMessageFactory.h
+++ b/test/MockBtMessageFactory.h
@@ -26,21 +26,21 @@ public:
   }
 
   virtual BtMessageHandle
-  createRequestMessage(const PieceHandle& piece, uint32_t blockIndex) {
+  createRequestMessage(const PieceHandle& piece, int32_t blockIndex) {
     return BtMessageHandle(0);
   }
 
   virtual BtMessageHandle
-  createCancelMessage(uint32_t index, uint32_t begin, uint32_t length) {
+  createCancelMessage(int32_t index, int32_t begin, uint32_t length) {
     return BtMessageHandle(0);
   }
 
   virtual BtMessageHandle
-  createPieceMessage(uint32_t index, uint32_t begin, uint32_t length) {
+  createPieceMessage(int32_t index, int32_t begin, uint32_t length) {
     return BtMessageHandle(0);
   }
 
-  virtual BtMessageHandle createHaveMessage(uint32_t index) {
+  virtual BtMessageHandle createHaveMessage(int32_t index) {
     return BtMessageHandle(0);
   }
 
@@ -77,11 +77,11 @@ public:
   }
 
   virtual BtMessageHandle
-  createRejectMessage(uint32_t index, uint32_t begin, uint32_t length) {
+  createRejectMessage(int32_t index, int32_t begin, uint32_t length) {
     return BtMessageHandle(0);
   }
 
-  virtual BtMessageHandle createAllowedFastMessage(uint32_t index) {
+  virtual BtMessageHandle createAllowedFastMessage(int32_t index) {
     return BtMessageHandle(0);
   }
 };