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Code Issues Releases Wiki Activity

Code cleanup

pull/24/head
Tatsuhiro Tsujikawa 2012-07-04 22:59:15 +09:00
parent 995c07c184
commit b25d8a9923
1 changed files with 15 additions and 15 deletions
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30
src/base64.h
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@ -127,30 +127,30 @@ std::string decode(InputIterator first, InputIterator last)
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1
};
std::string res;
InputIterator k[5];
InputIterator k[4];
int eq = 0;
for(; first != last;) {
for(int i = 1; i <= 4; ++i) {
k[i] = getNext(first, last, INDEX_TABLE);
if(k[i] == last) {
k[i-1] = getNext(first, last, INDEX_TABLE);
if(k[i-1] == last) {
// If i == 1, input may look like this: "TWFu\n" (i.e.,
// garbage at the end)
if(i != 1) {
res.clear();
}
return res;
} else if(*k[i] == '=' && eq == 0) {
} else if(*k[i-1] == '=' && eq == 0) {
eq = i;
}
first = k[i]+1;
first = k[i-1]+1;
}
if(eq) {
break;
}
int n = (INDEX_TABLE[static_cast<unsigned char>(*k[1])] << 18)+
(INDEX_TABLE[static_cast<unsigned char>(*k[2])] << 12)+
(INDEX_TABLE[static_cast<unsigned char>(*k[3])] << 6)+
INDEX_TABLE[static_cast<unsigned char>(*k[4])];
int n = (INDEX_TABLE[static_cast<unsigned char>(*k[0])] << 18)+
(INDEX_TABLE[static_cast<unsigned char>(*k[1])] << 12)+
(INDEX_TABLE[static_cast<unsigned char>(*k[2])] << 6)+
INDEX_TABLE[static_cast<unsigned char>(*k[3])];
res += n >> 16;
res += n >> 8 & 0xffu;
res += n & 0xffu;
@ -161,19 +161,19 @@ std::string decode(InputIterator first, InputIterator last)
return res;
} else {
for(int i = eq; i <= 4; ++i) {
if(*k[i] != '=') {
if(*k[i-1] != '=') {
res.clear();
return res;
}
}
if(eq == 3) {
int n = (INDEX_TABLE[static_cast<unsigned char>(*k[1])] << 18)+
(INDEX_TABLE[static_cast<unsigned char>(*k[2])] << 12);
int n = (INDEX_TABLE[static_cast<unsigned char>(*k[0])] << 18)+
(INDEX_TABLE[static_cast<unsigned char>(*k[1])] << 12);
res += n >> 16;
} else if(eq == 4) {
int n = (INDEX_TABLE[static_cast<unsigned char>(*k[1])] << 18)+
(INDEX_TABLE[static_cast<unsigned char>(*k[2])] << 12)+
(INDEX_TABLE[static_cast<unsigned char>(*k[3])] << 6);
int n = (INDEX_TABLE[static_cast<unsigned char>(*k[0])] << 18)+
(INDEX_TABLE[static_cast<unsigned char>(*k[1])] << 12)+
(INDEX_TABLE[static_cast<unsigned char>(*k[2])] << 6);
res += n >> 16;
res += n >> 8 & 0xffu;
}