From e976b23728d3d1fc1047cd00fef42ed8013bb295 Mon Sep 17 00:00:00 2001
From: Tatsuhiro Tsujikawa <tatsuhiro.t@gmail.com>
Date: Thu, 22 Oct 2009 15:35:33 +0000
Subject: [PATCH] 2009-10-23  Tatsuhiro Tsujikawa 
 <t-tujikawa@users.sourceforge.net>

	Renamed Util.{cc,h} as util.{cc,h}
	* src/Util.cc
	* src/Util.h
	* src/util.cc
	* src/util.h
---
 ChangeLog                               | 8 ++++++++
 src/AbstractCommand.cc                  | 2 +-
 src/AbstractDiskWriter.cc               | 2 +-
 src/AnnounceList.cc                     | 2 +-
 src/AsyncNameResolver.cc                | 2 +-
 src/AuthConfigFactory.cc                | 2 +-
 src/BitfieldMan.cc                      | 2 +-
 src/BtBitfieldMessage.cc                | 2 +-
 src/BtDependency.cc                     | 2 +-
 src/BtExtendedMessage.cc                | 2 +-
 src/BtHandshakeMessage.cc               | 2 +-
 src/BtHandshakeMessageValidator.h       | 2 +-
 src/BtPieceMessage.cc                   | 2 +-
 src/BtPortMessage.cc                    | 2 +-
 src/BtPostDownloadHandler.cc            | 2 +-
 src/BtSetup.cc                          | 2 +-
 src/ByteArrayDiskWriter.cc              | 2 +-
 src/ChunkedDecoder.cc                   | 2 +-
 src/ConsoleStatCalc.cc                  | 2 +-
 src/ContentTypeRequestGroupCriteria.cc  | 2 +-
 src/Cookie.cc                           | 2 +-
 src/CookieParser.cc                     | 2 +-
 src/CookieStorage.cc                    | 2 +-
 src/DHTAbstractNodeLookupTask.cc        | 2 +-
 src/DHTAbstractTask.cc                  | 2 +-
 src/DHTAnnouncePeerMessage.cc           | 2 +-
 src/DHTAutoSaveCommand.cc               | 2 +-
 src/DHTBucket.cc                        | 2 +-
 src/DHTBucketRefreshTask.cc             | 2 +-
 src/DHTConnectionImpl.cc                | 2 +-
 src/DHTEntryPointNameResolveCommand.cc  | 2 +-
 src/DHTFindNodeMessage.cc               | 2 +-
 src/DHTFindNodeReplyMessage.cc          | 2 +-
 src/DHTGetPeersMessage.cc               | 2 +-
 src/DHTGetPeersReplyMessage.cc          | 2 +-
 src/DHTMessage.cc                       | 2 +-
 src/DHTMessageFactoryImpl.cc            | 2 +-
 src/DHTMessageReceiver.cc               | 2 +-
 src/DHTMessageTracker.cc                | 2 +-
 src/DHTMessageTrackerEntry.cc           | 2 +-
 src/DHTNode.cc                          | 2 +-
 src/DHTNodeLookupTask.cc                | 2 +-
 src/DHTPeerAnnounceStorage.cc           | 2 +-
 src/DHTPeerLookupTask.cc                | 2 +-
 src/DHTQueryMessage.cc                  | 2 +-
 src/DHTResponseMessage.cc               | 2 +-
 src/DHTRoutingTable.cc                  | 2 +-
 src/DHTRoutingTableDeserializer.cc      | 2 +-
 src/DHTRoutingTableSerializer.cc        | 2 +-
 src/DHTSetup.cc                         | 2 +-
 src/DHTTokenTracker.cc                  | 2 +-
 src/DHTUnknownMessage.cc                | 2 +-
 src/DefaultBtAnnounce.cc                | 2 +-
 src/DefaultBtInteractive.cc             | 2 +-
 src/DefaultBtProgressInfoFile.cc        | 2 +-
 src/DefaultPieceStorage.cc              | 2 +-
 src/DownloadCommand.cc                  | 2 +-
 src/DownloadEngine.cc                   | 2 +-
 src/ExpatMetalinkProcessor.cc           | 2 +-
 src/ExpatXmlRpcRequestProcessor.cc      | 2 +-
 src/FeatureConfig.cc                    | 2 +-
 src/File.cc                             | 2 +-
 src/FileAllocationCommand.cc            | 2 +-
 src/FileEntry.cc                        | 2 +-
 src/FixedWidthNumberDecorator.h         | 2 +-
 src/FtpConnection.cc                    | 2 +-
 src/FtpNegotiationCommand.cc            | 2 +-
 src/HandshakeExtensionMessage.cc        | 2 +-
 src/HttpConnection.cc                   | 2 +-
 src/HttpHeader.cc                       | 2 +-
 src/HttpHeaderProcessor.cc              | 2 +-
 src/HttpRequest.cc                      | 2 +-
 src/HttpRequestCommand.cc               | 2 +-
 src/HttpResponse.cc                     | 2 +-
 src/HttpResponseCommand.cc              | 2 +-
 src/HttpServer.cc                       | 2 +-
 src/HttpServerCommand.cc                | 2 +-
 src/HttpSkipResponseCommand.cc          | 2 +-
 src/IndexBtMessage.cc                   | 2 +-
 src/IteratableChecksumValidator.cc      | 2 +-
 src/IteratableChunkChecksumValidator.cc | 2 +-
 src/MSEHandshake.cc                     | 2 +-
 src/Makefile.am                         | 2 +-
 src/Makefile.in                         | 8 ++++----
 src/MessageDigestHelper.cc              | 2 +-
 src/Metalink2RequestGroup.cc            | 2 +-
 src/MetalinkEntry.cc                    | 2 +-
 src/MetalinkParserController.cc         | 2 +-
 src/MetalinkParserStateImpl.cc          | 2 +-
 src/MultiDiskAdaptor.cc                 | 2 +-
 src/MultiUrlRequestInfo.cc              | 2 +-
 src/NameMatchOptionHandler.h            | 2 +-
 src/NameResolver.cc                     | 2 +-
 src/Netrc.cc                            | 2 +-
 src/NsCookieParser.cc                   | 2 +-
 src/OptionHandlerFactory.cc             | 2 +-
 src/OptionHandlerImpl.h                 | 2 +-
 src/OptionParser.cc                     | 2 +-
 src/ParameterizedStringParser.cc        | 2 +-
 src/Peer.cc                             | 2 +-
 src/PeerReceiveHandshakeCommand.cc      | 2 +-
 src/Piece.cc                            | 4 ++--
 src/RangeBtMessage.cc                   | 2 +-
 src/Request.cc                          | 2 +-
 src/RequestGroup.cc                     | 2 +-
 src/RequestGroupMan.cc                  | 2 +-
 src/RequestSlot.cc                      | 2 +-
 src/SegmentMan.cc                       | 2 +-
 src/ServerStatMan.cc                    | 2 +-
 src/SimpleLogger.cc                     | 2 +-
 src/SingleFileAllocationIterator.cc     | 2 +-
 src/SocketCore.cc                       | 2 +-
 src/Sqlite3MozCookieParser.cc           | 2 +-
 src/TimeA2.cc                           | 2 +-
 src/UTPexExtensionMessage.cc            | 2 +-
 src/UriListParser.cc                    | 2 +-
 src/XML2SAXMetalinkProcessor.cc         | 2 +-
 src/Xml2XmlRpcRequestProcessor.cc       | 2 +-
 src/XmlRpcMethodImpl.cc                 | 2 +-
 src/XmlRpcRequestParserStateImpl.cc     | 2 +-
 src/XmlRpcResponse.cc                   | 2 +-
 src/bitfield.h                          | 2 +-
 src/bittorrent_helper.cc                | 2 +-
 src/bittorrent_helper.h                 | 2 +-
 src/download_helper.cc                  | 2 +-
 src/main.cc                             | 2 +-
 src/messageDigest.cc                    | 2 +-
 src/option_processing.cc                | 2 +-
 src/{Util.cc => util.cc}                | 2 +-
 src/{Util.h => util.h}                  | 0
 src/version_usage.cc                    | 2 +-
 test/ARC4Test.cc                        | 2 +-
 test/BDETest.cc                         | 2 +-
 test/BNodeTest.cc                       | 2 +-
 test/BittorrentHelperTest.cc            | 2 +-
 test/BtAllowedFastMessageTest.cc        | 2 +-
 test/BtBitfieldMessageTest.cc           | 2 +-
 test/BtHandshakeMessageTest.cc          | 2 +-
 test/BtPortMessageTest.cc               | 2 +-
 test/CookieStorageTest.cc               | 2 +-
 test/CookieTest.cc                      | 2 +-
 test/DHKeyExchangeTest.cc               | 2 +-
 test/DHTAnnouncePeerMessageTest.cc      | 2 +-
 test/DHTAnnouncePeerReplyMessageTest.cc | 2 +-
 test/DHTBucketTest.cc                   | 2 +-
 test/DHTFindNodeMessageTest.cc          | 2 +-
 test/DHTFindNodeReplyMessageTest.cc     | 2 +-
 test/DHTGetPeersMessageTest.cc          | 2 +-
 test/DHTGetPeersReplyMessageTest.cc     | 2 +-
 test/DHTIDCloserTest.cc                 | 2 +-
 test/DHTMessageFactoryImplTest.cc       | 2 +-
 test/DHTMessageTrackerEntryTest.cc      | 2 +-
 test/DHTMessageTrackerTest.cc           | 2 +-
 test/DHTNodeTest.cc                     | 2 +-
 test/DHTPeerAnnounceEntryTest.cc        | 2 +-
 test/DHTPeerAnnounceStorageTest.cc      | 2 +-
 test/DHTPingMessageTest.cc              | 2 +-
 test/DHTPingReplyMessageTest.cc         | 2 +-
 test/DHTRoutingTableDeserializerTest.cc | 2 +-
 test/DHTRoutingTableSerializerTest.cc   | 2 +-
 test/DHTRoutingTableTest.cc             | 2 +-
 test/DHTTokenTrackerTest.cc             | 2 +-
 test/DefaultBtAnnounceTest.cc           | 2 +-
 test/DefaultBtMessageDispatcherTest.cc  | 2 +-
 test/DefaultBtProgressInfoFileTest.cc   | 2 +-
 test/DefaultPeerStorageTest.cc          | 2 +-
 test/DefaultPieceStorageTest.cc         | 2 +-
 test/DirectDiskAdaptorTest.cc           | 2 +-
 test/DownloadHelperTest.cc              | 2 +-
 test/FeatureConfigTest.cc               | 2 +-
 test/FeedbackURISelectorTest.cc         | 2 +-
 test/FtpConnectionTest.cc               | 2 +-
 test/GZipDecoderTest.cc                 | 2 +-
 test/HttpRequestTest.cc                 | 2 +-
 test/InOrderURISelectorTest.cc          | 2 +-
 test/MSEHandshakeTest.cc                | 2 +-
 test/MessageDigestHelperTest.cc         | 2 +-
 test/NsCookieParserTest.cc              | 2 +-
 test/OptionParserTest.cc                | 2 +-
 test/PeerSessionResourceTest.cc         | 2 +-
 test/ProtocolDetectorTest.cc            | 2 +-
 test/ServerStatManTest.cc               | 2 +-
 test/ServerStatTest.cc                  | 2 +-
 test/Sqlite3MozCookieParserTest.cc      | 2 +-
 test/StringFormatTest.cc                | 2 +-
 test/TimeSeedCriteriaTest.cc            | 2 +-
 test/TimeTest.cc                        | 2 +-
 test/UTPexExtensionMessageTest.cc       | 2 +-
 test/UriListParserTest.cc               | 2 +-
 test/UtilTest.cc                        | 2 +-
 test/XORCloserTest.cc                   | 2 +-
 191 files changed, 201 insertions(+), 193 deletions(-)
 rename src/{Util.cc => util.cc} (99%)
 rename src/{Util.h => util.h} (100%)

diff --git a/ChangeLog b/ChangeLog
index 7396c41a..7ef8a29c 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+2009-10-23  Tatsuhiro Tsujikawa  <t-tujikawa@users.sourceforge.net>
+
+	Renamed Util.{cc,h} as util.{cc,h}
+	* src/Util.cc
+	* src/Util.h
+	* src/util.cc
+	* src/util.h
+
 2009-10-22  Tatsuhiro Tsujikawa  <t-tujikawa@users.sourceforge.net>
 
 	Moved static functions in Util class to namespace util.
diff --git a/src/AbstractCommand.cc b/src/AbstractCommand.cc
index a0774350..71ebe860 100644
--- a/src/AbstractCommand.cc
+++ b/src/AbstractCommand.cc
@@ -61,7 +61,7 @@
 #include "ServerStat.h"
 #include "RequestGroupMan.h"
 #include "A2STR.h"
-#include "Util.h"
+#include "util.h"
 #include "LogFactory.h"
 #include "DownloadContext.h"
 
diff --git a/src/AbstractDiskWriter.cc b/src/AbstractDiskWriter.cc
index 0491b896..78e9ffed 100644
--- a/src/AbstractDiskWriter.cc
+++ b/src/AbstractDiskWriter.cc
@@ -45,7 +45,7 @@
 #endif // __MINGW32__
 
 #include "File.h"
-#include "Util.h"
+#include "util.h"
 #include "message.h"
 #include "LogFactory.h"
 #include "Logger.h"
diff --git a/src/AnnounceList.cc b/src/AnnounceList.cc
index b98825aa..67260a98 100644
--- a/src/AnnounceList.cc
+++ b/src/AnnounceList.cc
@@ -39,7 +39,7 @@
 #include "A2STR.h"
 #include "SimpleRandomizer.h"
 #include "bencode.h"
-#include "Util.h"
+#include "util.h"
 
 namespace aria2 {
 
diff --git a/src/AsyncNameResolver.cc b/src/AsyncNameResolver.cc
index 9546b6c8..62f826ae 100644
--- a/src/AsyncNameResolver.cc
+++ b/src/AsyncNameResolver.cc
@@ -33,7 +33,7 @@
  */
 /* copyright --> */
 #include "AsyncNameResolver.h"
-#include "Util.h"
+#include "util.h"
 #include "A2STR.h"
 #include <cstring>
 
diff --git a/src/AuthConfigFactory.cc b/src/AuthConfigFactory.cc
index dd9c0a79..c3dfc823 100644
--- a/src/AuthConfigFactory.cc
+++ b/src/AuthConfigFactory.cc
@@ -43,7 +43,7 @@
 #include "NetrcAuthResolver.h"
 #include "prefs.h"
 #include "Request.h"
-#include "Util.h"
+#include "util.h"
 
 namespace aria2 {
 
diff --git a/src/BitfieldMan.cc b/src/BitfieldMan.cc
index 70776894..94cec879 100644
--- a/src/BitfieldMan.cc
+++ b/src/BitfieldMan.cc
@@ -38,7 +38,7 @@
 #include <cstring>
 
 #include "Randomizer.h"
-#include "Util.h"
+#include "util.h"
 #include "array_fun.h"
 #include "bitfield.h"
 
diff --git a/src/BtBitfieldMessage.cc b/src/BtBitfieldMessage.cc
index 9451cf5d..40972105 100644
--- a/src/BtBitfieldMessage.cc
+++ b/src/BtBitfieldMessage.cc
@@ -37,7 +37,7 @@
 #include <cstring>
 
 #include "bittorrent_helper.h"
-#include "Util.h"
+#include "util.h"
 #include "DlAbortEx.h"
 #include "message.h"
 #include "Peer.h"
diff --git a/src/BtDependency.cc b/src/BtDependency.cc
index 936923d4..6041a9ef 100644
--- a/src/BtDependency.cc
+++ b/src/BtDependency.cc
@@ -41,7 +41,7 @@
 #include "RecoverableException.h"
 #include "message.h"
 #include "prefs.h"
-#include "Util.h"
+#include "util.h"
 #include "PieceStorage.h"
 #include "DiskAdaptor.h"
 #include "File.h"
diff --git a/src/BtExtendedMessage.cc b/src/BtExtendedMessage.cc
index 913085ca..eec37cda 100644
--- a/src/BtExtendedMessage.cc
+++ b/src/BtExtendedMessage.cc
@@ -43,7 +43,7 @@
 #include "Peer.h"
 #include "DlAbortEx.h"
 #include "message.h"
-#include "Util.h"
+#include "util.h"
 #include "StringFormat.h"
 #include "a2functional.h"
 
diff --git a/src/BtHandshakeMessage.cc b/src/BtHandshakeMessage.cc
index 1be54862..aaf8b643 100644
--- a/src/BtHandshakeMessage.cc
+++ b/src/BtHandshakeMessage.cc
@@ -36,7 +36,7 @@
 
 #include <cstring>
 
-#include "Util.h"
+#include "util.h"
 #include "BtConstants.h"
 #include "a2functional.h"
 
diff --git a/src/BtHandshakeMessageValidator.h b/src/BtHandshakeMessageValidator.h
index 59a4ce0f..8e618650 100644
--- a/src/BtHandshakeMessageValidator.h
+++ b/src/BtHandshakeMessageValidator.h
@@ -40,7 +40,7 @@
 #include <cstring>
 
 #include "BtHandshakeMessage.h"
-#include "Util.h"
+#include "util.h"
 #include "StringFormat.h"
 
 namespace aria2 {
diff --git a/src/BtPieceMessage.cc b/src/BtPieceMessage.cc
index 4ff4e897..c97e570b 100644
--- a/src/BtPieceMessage.cc
+++ b/src/BtPieceMessage.cc
@@ -39,7 +39,7 @@
 #include <cassert>
 
 #include "bittorrent_helper.h"
-#include "Util.h"
+#include "util.h"
 #include "message.h"
 #include "DlAbortEx.h"
 #include "MessageDigestHelper.h"
diff --git a/src/BtPortMessage.cc b/src/BtPortMessage.cc
index 28a4a8d3..8baf0c0f 100644
--- a/src/BtPortMessage.cc
+++ b/src/BtPortMessage.cc
@@ -35,7 +35,7 @@
 #include "BtPortMessage.h"
 #include "bittorrent_helper.h"
 #include "DlAbortEx.h"
-#include "Util.h"
+#include "util.h"
 #include "message.h"
 #include "Logger.h"
 #include "Peer.h"
diff --git a/src/BtPostDownloadHandler.cc b/src/BtPostDownloadHandler.cc
index 2888495e..fa0b8b2e 100644
--- a/src/BtPostDownloadHandler.cc
+++ b/src/BtPostDownloadHandler.cc
@@ -41,7 +41,7 @@
 #include "File.h"
 #include "PieceStorage.h"
 #include "DiskAdaptor.h"
-#include "Util.h"
+#include "util.h"
 #include "ContentTypeRequestGroupCriteria.h"
 #include "Exception.h"
 #include "DownloadContext.h"
diff --git a/src/BtSetup.cc b/src/BtSetup.cc
index 67775860..d2242ccf 100644
--- a/src/BtSetup.cc
+++ b/src/BtSetup.cc
@@ -49,7 +49,7 @@
 #include "prefs.h"
 #include "LogFactory.h"
 #include "Logger.h"
-#include "Util.h"
+#include "util.h"
 #include "IntSequence.h"
 #include "DHTGetPeersCommand.h"
 #include "DHTPeerAnnounceStorage.h"
diff --git a/src/ByteArrayDiskWriter.cc b/src/ByteArrayDiskWriter.cc
index 612f9db1..5849142b 100644
--- a/src/ByteArrayDiskWriter.cc
+++ b/src/ByteArrayDiskWriter.cc
@@ -33,7 +33,7 @@
  */
 /* copyright --> */
 #include "ByteArrayDiskWriter.h"
-#include "Util.h"
+#include "util.h"
 #include "A2STR.h"
 
 namespace aria2 {
diff --git a/src/ChunkedDecoder.cc b/src/ChunkedDecoder.cc
index 77462fe8..a18f3fd9 100644
--- a/src/ChunkedDecoder.cc
+++ b/src/ChunkedDecoder.cc
@@ -33,7 +33,7 @@
  */
 /* copyright --> */
 #include "ChunkedDecoder.h"
-#include "Util.h"
+#include "util.h"
 #include "message.h"
 #include "DlAbortEx.h"
 #include "StringFormat.h"
diff --git a/src/ConsoleStatCalc.cc b/src/ConsoleStatCalc.cc
index 5219f35e..fca59adc 100644
--- a/src/ConsoleStatCalc.cc
+++ b/src/ConsoleStatCalc.cc
@@ -56,7 +56,7 @@
 #include "FileAllocationEntry.h"
 #include "CheckIntegrityMan.h"
 #include "CheckIntegrityEntry.h"
-#include "Util.h"
+#include "util.h"
 #include "DownloadContext.h"
 #ifdef ENABLE_BITTORRENT
 # include "bittorrent_helper.h"
diff --git a/src/ContentTypeRequestGroupCriteria.cc b/src/ContentTypeRequestGroupCriteria.cc
index ce3a3a2f..8f726332 100644
--- a/src/ContentTypeRequestGroupCriteria.cc
+++ b/src/ContentTypeRequestGroupCriteria.cc
@@ -37,7 +37,7 @@
 #include <algorithm>
 
 #include "RequestGroup.h"
-#include "Util.h"
+#include "util.h"
 #include "FileEntry.h"
 #include "DownloadContext.h"
 
diff --git a/src/Cookie.cc b/src/Cookie.cc
index 3d16b9e0..e541623d 100644
--- a/src/Cookie.cc
+++ b/src/Cookie.cc
@@ -37,7 +37,7 @@
 #include <algorithm>
 #include <sstream>
 
-#include "Util.h"
+#include "util.h"
 #include "A2STR.h"
 #include "TimeA2.h"
 #include "a2functional.h"
diff --git a/src/CookieParser.cc b/src/CookieParser.cc
index 1a9d5be9..55112392 100644
--- a/src/CookieParser.cc
+++ b/src/CookieParser.cc
@@ -41,7 +41,7 @@
 #include <map>
 #include <vector>
 
-#include "Util.h"
+#include "util.h"
 #include "A2STR.h"
 #include "TimeA2.h"
 
diff --git a/src/CookieStorage.cc b/src/CookieStorage.cc
index e716bd85..793e6213 100644
--- a/src/CookieStorage.cc
+++ b/src/CookieStorage.cc
@@ -38,7 +38,7 @@
 #include <algorithm>
 #include <fstream>
 
-#include "Util.h"
+#include "util.h"
 #include "LogFactory.h"
 #include "Logger.h"
 #include "DlAbortEx.h"
diff --git a/src/DHTAbstractNodeLookupTask.cc b/src/DHTAbstractNodeLookupTask.cc
index fbee6455..f4752b0c 100644
--- a/src/DHTAbstractNodeLookupTask.cc
+++ b/src/DHTAbstractNodeLookupTask.cc
@@ -43,7 +43,7 @@
 #include "DHTBucket.h"
 #include "LogFactory.h"
 #include "Logger.h"
-#include "Util.h"
+#include "util.h"
 #include "DHTIDCloser.h"
 #include <cstring>
 #include <algorithm>
diff --git a/src/DHTAbstractTask.cc b/src/DHTAbstractTask.cc
index 9e6c4f52..3665d71e 100644
--- a/src/DHTAbstractTask.cc
+++ b/src/DHTAbstractTask.cc
@@ -42,7 +42,7 @@
 #include "DHTBucket.h"
 #include "DHTTaskQueue.h"
 #include "LogFactory.h"
-#include "Util.h"
+#include "util.h"
 
 namespace aria2 {
 
diff --git a/src/DHTAnnouncePeerMessage.cc b/src/DHTAnnouncePeerMessage.cc
index 07ef5178..6eaeb032 100644
--- a/src/DHTAnnouncePeerMessage.cc
+++ b/src/DHTAnnouncePeerMessage.cc
@@ -41,7 +41,7 @@
 #include "DHTMessageFactory.h"
 #include "DHTMessageDispatcher.h"
 #include "DHTMessageCallback.h"
-#include "Util.h"
+#include "util.h"
 #include "DHTPeerAnnounceStorage.h"
 #include "DHTTokenTracker.h"
 #include "DlAbortEx.h"
diff --git a/src/DHTAutoSaveCommand.cc b/src/DHTAutoSaveCommand.cc
index 11247a1b..c376bb3a 100644
--- a/src/DHTAutoSaveCommand.cc
+++ b/src/DHTAutoSaveCommand.cc
@@ -44,7 +44,7 @@
 #include "DHTRoutingTableSerializer.h"
 #include "RecoverableException.h"
 #include "DownloadEngine.h"
-#include "Util.h"
+#include "util.h"
 #include "DHTBucket.h"
 #include "RequestGroupMan.h"
 #include "prefs.h"
diff --git a/src/DHTBucket.cc b/src/DHTBucket.cc
index abcdb53d..e838b522 100644
--- a/src/DHTBucket.cc
+++ b/src/DHTBucket.cc
@@ -41,7 +41,7 @@
 #include "DHTNode.h"
 #include "LogFactory.h"
 #include "Logger.h"
-#include "Util.h"
+#include "util.h"
 #include "DHTConstants.h"
 #include "a2functional.h"
 #include "bittorrent_helper.h"
diff --git a/src/DHTBucketRefreshTask.cc b/src/DHTBucketRefreshTask.cc
index 90a743fe..47af91fc 100644
--- a/src/DHTBucketRefreshTask.cc
+++ b/src/DHTBucketRefreshTask.cc
@@ -39,7 +39,7 @@
 #include "DHTTaskQueue.h"
 #include "DHTNode.h"
 #include "DHTNodeLookupEntry.h"
-#include "Util.h"
+#include "util.h"
 #include "Logger.h"
 
 namespace aria2 {
diff --git a/src/DHTConnectionImpl.cc b/src/DHTConnectionImpl.cc
index 96088ab3..5d22481d 100644
--- a/src/DHTConnectionImpl.cc
+++ b/src/DHTConnectionImpl.cc
@@ -41,7 +41,7 @@
 #include "LogFactory.h"
 #include "Logger.h"
 #include "RecoverableException.h"
-#include "Util.h"
+#include "util.h"
 #include "Socket.h"
 #include "SimpleRandomizer.h"
 
diff --git a/src/DHTEntryPointNameResolveCommand.cc b/src/DHTEntryPointNameResolveCommand.cc
index dbe9ae9a..9ff27565 100644
--- a/src/DHTEntryPointNameResolveCommand.cc
+++ b/src/DHTEntryPointNameResolveCommand.cc
@@ -41,7 +41,7 @@
 #include "DlAbortEx.h"
 #include "prefs.h"
 #include "message.h"
-#include "Util.h"
+#include "util.h"
 #include "Option.h"
 #include "DHTNode.h"
 #include "DHTTaskQueue.h"
diff --git a/src/DHTFindNodeMessage.cc b/src/DHTFindNodeMessage.cc
index f35c40dd..bd722044 100644
--- a/src/DHTFindNodeMessage.cc
+++ b/src/DHTFindNodeMessage.cc
@@ -41,7 +41,7 @@
 #include "DHTMessageFactory.h"
 #include "DHTMessageDispatcher.h"
 #include "DHTMessageCallback.h"
-#include "Util.h"
+#include "util.h"
 #include "bencode.h"
 
 namespace aria2 {
diff --git a/src/DHTFindNodeReplyMessage.cc b/src/DHTFindNodeReplyMessage.cc
index cadab099..64a78a0b 100644
--- a/src/DHTFindNodeReplyMessage.cc
+++ b/src/DHTFindNodeReplyMessage.cc
@@ -43,7 +43,7 @@
 #include "DHTMessageDispatcher.h"
 #include "DHTMessageCallback.h"
 #include "bittorrent_helper.h"
-#include "Util.h"
+#include "util.h"
 #include "bencode.h"
 
 namespace aria2 {
diff --git a/src/DHTGetPeersMessage.cc b/src/DHTGetPeersMessage.cc
index 20f58ee0..0e814a42 100644
--- a/src/DHTGetPeersMessage.cc
+++ b/src/DHTGetPeersMessage.cc
@@ -44,7 +44,7 @@
 #include "DHTPeerAnnounceStorage.h"
 #include "Peer.h"
 #include "DHTTokenTracker.h"
-#include "Util.h"
+#include "util.h"
 #include "bencode.h"
 
 namespace aria2 {
diff --git a/src/DHTGetPeersReplyMessage.cc b/src/DHTGetPeersReplyMessage.cc
index 2f096610..ad6a02cb 100644
--- a/src/DHTGetPeersReplyMessage.cc
+++ b/src/DHTGetPeersReplyMessage.cc
@@ -44,7 +44,7 @@
 #include "DHTMessageCallback.h"
 #include "bittorrent_helper.h"
 #include "Peer.h"
-#include "Util.h"
+#include "util.h"
 #include "bencode.h"
 #include "a2functional.h"
 
diff --git a/src/DHTMessage.cc b/src/DHTMessage.cc
index 86f51e2a..515e6d5d 100644
--- a/src/DHTMessage.cc
+++ b/src/DHTMessage.cc
@@ -34,7 +34,7 @@
 /* copyright --> */
 #include "DHTMessage.h"
 #include "DHTNode.h"
-#include "Util.h"
+#include "util.h"
 
 namespace aria2 {
 
diff --git a/src/DHTMessageFactoryImpl.cc b/src/DHTMessageFactoryImpl.cc
index 36e78901..bf95ff1a 100644
--- a/src/DHTMessageFactoryImpl.cc
+++ b/src/DHTMessageFactoryImpl.cc
@@ -57,7 +57,7 @@
 #include "DHTMessageCallback.h"
 #include "bittorrent_helper.h"
 #include "BtRuntime.h"
-#include "Util.h"
+#include "util.h"
 #include "Peer.h"
 #include "Logger.h"
 #include "StringFormat.h"
diff --git a/src/DHTMessageReceiver.cc b/src/DHTMessageReceiver.cc
index 4a7b1180..9146e165 100644
--- a/src/DHTMessageReceiver.cc
+++ b/src/DHTMessageReceiver.cc
@@ -49,7 +49,7 @@
 #include "DlAbortEx.h"
 #include "LogFactory.h"
 #include "Logger.h"
-#include "Util.h"
+#include "util.h"
 #include "bencode.h"
 
 namespace aria2 {
diff --git a/src/DHTMessageTracker.cc b/src/DHTMessageTracker.cc
index af994e50..e3fc44a6 100644
--- a/src/DHTMessageTracker.cc
+++ b/src/DHTMessageTracker.cc
@@ -42,7 +42,7 @@
 #include "DHTNode.h"
 #include "DHTRoutingTable.h"
 #include "DHTMessageFactory.h"
-#include "Util.h"
+#include "util.h"
 #include "LogFactory.h"
 #include "Logger.h"
 #include "DlAbortEx.h"
diff --git a/src/DHTMessageTrackerEntry.cc b/src/DHTMessageTrackerEntry.cc
index 6267370b..1ff741c7 100644
--- a/src/DHTMessageTrackerEntry.cc
+++ b/src/DHTMessageTrackerEntry.cc
@@ -37,7 +37,7 @@
 #include "DHTMessage.h"
 #include "DHTMessageCallback.h"
 #include "DHTConstants.h"
-#include "Util.h"
+#include "util.h"
 
 namespace aria2 {
 
diff --git a/src/DHTNode.cc b/src/DHTNode.cc
index ca33f7ea..82beff41 100644
--- a/src/DHTNode.cc
+++ b/src/DHTNode.cc
@@ -36,7 +36,7 @@
 
 #include <cstring>
 
-#include "Util.h"
+#include "util.h"
 #include "a2functional.h"
 #include "bittorrent_helper.h"
 
diff --git a/src/DHTNodeLookupTask.cc b/src/DHTNodeLookupTask.cc
index 6a94322d..b1cc73ef 100644
--- a/src/DHTNodeLookupTask.cc
+++ b/src/DHTNodeLookupTask.cc
@@ -38,7 +38,7 @@
 #include "DHTNode.h"
 #include "DHTNodeLookupEntry.h"
 #include "LogFactory.h"
-#include "Util.h"
+#include "util.h"
 #include <cassert>
 
 namespace aria2 {
diff --git a/src/DHTPeerAnnounceStorage.cc b/src/DHTPeerAnnounceStorage.cc
index 764f0156..6229e703 100644
--- a/src/DHTPeerAnnounceStorage.cc
+++ b/src/DHTPeerAnnounceStorage.cc
@@ -46,7 +46,7 @@
 #include "DHTTask.h"
 #include "LogFactory.h"
 #include "Logger.h"
-#include "Util.h"
+#include "util.h"
 #include "a2functional.h"
 
 namespace aria2 {
diff --git a/src/DHTPeerLookupTask.cc b/src/DHTPeerLookupTask.cc
index fc74f898..76fd5f44 100644
--- a/src/DHTPeerLookupTask.cc
+++ b/src/DHTPeerLookupTask.cc
@@ -43,7 +43,7 @@
 #include "DHTMessageCallback.h"
 #include "PeerStorage.h"
 #include "BtRuntime.h"
-#include "Util.h"
+#include "util.h"
 #include "DHTBucket.h"
 #include "bittorrent_helper.h"
 
diff --git a/src/DHTQueryMessage.cc b/src/DHTQueryMessage.cc
index b0424294..71166005 100644
--- a/src/DHTQueryMessage.cc
+++ b/src/DHTQueryMessage.cc
@@ -34,7 +34,7 @@
 /* copyright --> */
 #include "DHTQueryMessage.h"
 #include "DHTNode.h"
-#include "Util.h"
+#include "util.h"
 #include "bencode.h"
 #include "a2functional.h"
 
diff --git a/src/DHTResponseMessage.cc b/src/DHTResponseMessage.cc
index 7180bc3f..92768e4a 100644
--- a/src/DHTResponseMessage.cc
+++ b/src/DHTResponseMessage.cc
@@ -34,7 +34,7 @@
 /* copyright --> */
 #include "DHTResponseMessage.h"
 #include "DHTNode.h"
-#include "Util.h"
+#include "util.h"
 #include "bencode.h"
 #include "a2functional.h"
 
diff --git a/src/DHTRoutingTable.cc b/src/DHTRoutingTable.cc
index f1e50e6e..d4d1defc 100644
--- a/src/DHTRoutingTable.cc
+++ b/src/DHTRoutingTable.cc
@@ -42,7 +42,7 @@
 #include "DHTTaskQueue.h"
 #include "DHTTaskFactory.h"
 #include "DHTTask.h"
-#include "Util.h"
+#include "util.h"
 #include "LogFactory.h"
 #include "Logger.h"
 
diff --git a/src/DHTRoutingTableDeserializer.cc b/src/DHTRoutingTableDeserializer.cc
index eae6d5d4..65059750 100644
--- a/src/DHTRoutingTableDeserializer.cc
+++ b/src/DHTRoutingTableDeserializer.cc
@@ -47,7 +47,7 @@
 #include "Logger.h"
 #include "a2netcompat.h"
 #include "StringFormat.h"
-#include "Util.h"
+#include "util.h"
 #include "array_fun.h"
 
 namespace aria2 {
diff --git a/src/DHTRoutingTableSerializer.cc b/src/DHTRoutingTableSerializer.cc
index 763e3c61..f20485cb 100644
--- a/src/DHTRoutingTableSerializer.cc
+++ b/src/DHTRoutingTableSerializer.cc
@@ -45,7 +45,7 @@
 #include "Logger.h"
 #include "a2netcompat.h"
 #include "StringFormat.h"
-#include "Util.h"
+#include "util.h"
 
 namespace aria2 {
 
diff --git a/src/DHTSetup.cc b/src/DHTSetup.cc
index 4bb9cdad..1cf421df 100644
--- a/src/DHTSetup.cc
+++ b/src/DHTSetup.cc
@@ -39,7 +39,7 @@
 
 #include "LogFactory.h"
 #include "Logger.h"
-#include "Util.h"
+#include "util.h"
 #include "File.h"
 #include "DHTNode.h"
 #include "DHTConnectionImpl.h"
diff --git a/src/DHTTokenTracker.cc b/src/DHTTokenTracker.cc
index 852775cf..54cc5c32 100644
--- a/src/DHTTokenTracker.cc
+++ b/src/DHTTokenTracker.cc
@@ -36,7 +36,7 @@
 
 #include <cstring>
 
-#include "Util.h"
+#include "util.h"
 #include "bittorrent_helper.h"
 #include "DlAbortEx.h"
 #include "DHTConstants.h"
diff --git a/src/DHTUnknownMessage.cc b/src/DHTUnknownMessage.cc
index 931111f9..55f074e4 100644
--- a/src/DHTUnknownMessage.cc
+++ b/src/DHTUnknownMessage.cc
@@ -38,7 +38,7 @@
 #include <cstdlib>
 
 #include "DHTNode.h"
-#include "Util.h"
+#include "util.h"
 #include "a2functional.h"
 
 namespace aria2 {
diff --git a/src/DefaultBtAnnounce.cc b/src/DefaultBtAnnounce.cc
index 99b686f9..483986cd 100644
--- a/src/DefaultBtAnnounce.cc
+++ b/src/DefaultBtAnnounce.cc
@@ -36,7 +36,7 @@
 #include "LogFactory.h"
 #include "Logger.h"
 #include "PeerListProcessor.h"
-#include "Util.h"
+#include "util.h"
 #include "prefs.h"
 #include "DlAbortEx.h"
 #include "message.h"
diff --git a/src/DefaultBtInteractive.cc b/src/DefaultBtInteractive.cc
index f5b88d20..9b6147ee 100644
--- a/src/DefaultBtInteractive.cc
+++ b/src/DefaultBtInteractive.cc
@@ -39,7 +39,7 @@
 #include "prefs.h"
 #include "message.h"
 #include "BtHandshakeMessage.h"
-#include "Util.h"
+#include "util.h"
 #include "BtKeepAliveMessage.h"
 #include "BtChokeMessage.h"
 #include "BtUnchokeMessage.h"
diff --git a/src/DefaultBtProgressInfoFile.cc b/src/DefaultBtProgressInfoFile.cc
index 6d80f914..1636caee 100644
--- a/src/DefaultBtProgressInfoFile.cc
+++ b/src/DefaultBtProgressInfoFile.cc
@@ -49,7 +49,7 @@
 #include "DlAbortEx.h"
 #include "message.h"
 #include "File.h"
-#include "Util.h"
+#include "util.h"
 #include "a2io.h"
 #include "DownloadFailureException.h"
 #include "StringFormat.h"
diff --git a/src/DefaultPieceStorage.cc b/src/DefaultPieceStorage.cc
index a9edf5ca..9e7e816f 100644
--- a/src/DefaultPieceStorage.cc
+++ b/src/DefaultPieceStorage.cc
@@ -52,7 +52,7 @@
 #include "DefaultDiskWriterFactory.h"
 #include "FileEntry.h"
 #include "DlAbortEx.h"
-#include "Util.h"
+#include "util.h"
 #include "a2functional.h"
 #include "Option.h"
 #include "StringFormat.h"
diff --git a/src/DownloadCommand.cc b/src/DownloadCommand.cc
index fe8a3f14..44c2157c 100644
--- a/src/DownloadCommand.cc
+++ b/src/DownloadCommand.cc
@@ -51,7 +51,7 @@
 #include "DiskAdaptor.h"
 #include "DownloadContext.h"
 #include "Option.h"
-#include "Util.h"
+#include "util.h"
 #include "Socket.h"
 #include "message.h"
 #include "prefs.h"
diff --git a/src/DownloadEngine.cc b/src/DownloadEngine.cc
index 03a51844..800672ad 100644
--- a/src/DownloadEngine.cc
+++ b/src/DownloadEngine.cc
@@ -51,7 +51,7 @@
 #include "TimeA2.h"
 #include "a2time.h"
 #include "Socket.h"
-#include "Util.h"
+#include "util.h"
 #include "a2functional.h"
 #include "DlAbortEx.h"
 #include "ServerStatMan.h"
diff --git a/src/ExpatMetalinkProcessor.cc b/src/ExpatMetalinkProcessor.cc
index 70f681df..a1918b92 100644
--- a/src/ExpatMetalinkProcessor.cc
+++ b/src/ExpatMetalinkProcessor.cc
@@ -37,7 +37,7 @@
 #include "MetalinkParserStateMachine.h"
 #include "Metalinker.h"
 #include "MetalinkEntry.h"
-#include "Util.h"
+#include "util.h"
 #include "message.h"
 #include "DlAbortEx.h"
 
diff --git a/src/ExpatXmlRpcRequestProcessor.cc b/src/ExpatXmlRpcRequestProcessor.cc
index 60597fdb..46d8b4b3 100644
--- a/src/ExpatXmlRpcRequestProcessor.cc
+++ b/src/ExpatXmlRpcRequestProcessor.cc
@@ -39,7 +39,7 @@
 #include <expat.h>
 
 #include "XmlRpcRequestParserStateMachine.h"
-#include "Util.h"
+#include "util.h"
 #include "DlAbortEx.h"
 #include "message.h"
 
diff --git a/src/FeatureConfig.cc b/src/FeatureConfig.cc
index 6a67b886..c3a94931 100644
--- a/src/FeatureConfig.cc
+++ b/src/FeatureConfig.cc
@@ -37,7 +37,7 @@
 #include <numeric>
 
 #include "array_fun.h"
-#include "Util.h"
+#include "util.h"
 #include "Request.h"
 
 namespace aria2 {
diff --git a/src/File.cc b/src/File.cc
index 944f2d75..23ab3933 100644
--- a/src/File.cc
+++ b/src/File.cc
@@ -43,7 +43,7 @@
 #include <cstring>
 #include <cstdio>
 
-#include "Util.h"
+#include "util.h"
 #include "A2STR.h"
 #include "array_fun.h"
 
diff --git a/src/FileAllocationCommand.cc b/src/FileAllocationCommand.cc
index dfa669f3..993c4f0b 100644
--- a/src/FileAllocationCommand.cc
+++ b/src/FileAllocationCommand.cc
@@ -40,7 +40,7 @@
 #include "Logger.h"
 #include "message.h"
 #include "prefs.h"
-#include "Util.h"
+#include "util.h"
 #include "DownloadEngine.h"
 #include "DownloadContext.h"
 
diff --git a/src/FileEntry.cc b/src/FileEntry.cc
index ba092b34..be57587d 100644
--- a/src/FileEntry.cc
+++ b/src/FileEntry.cc
@@ -37,7 +37,7 @@
 #include <cassert>
 #include <algorithm>
 
-#include "Util.h"
+#include "util.h"
 #include "URISelector.h"
 #include "LogFactory.h"
 
diff --git a/src/FixedWidthNumberDecorator.h b/src/FixedWidthNumberDecorator.h
index cdcce232..6d3dcc45 100644
--- a/src/FixedWidthNumberDecorator.h
+++ b/src/FixedWidthNumberDecorator.h
@@ -36,7 +36,7 @@
 #define _D_FIXED_WIDTH_NUMBER_DECORATOR_H_
 
 #include "NumberDecorator.h"
-#include "Util.h"
+#include "util.h"
 
 namespace aria2 {
 
diff --git a/src/FtpConnection.cc b/src/FtpConnection.cc
index 3b82c562..1bcc837e 100644
--- a/src/FtpConnection.cc
+++ b/src/FtpConnection.cc
@@ -41,7 +41,7 @@
 #include "Request.h"
 #include "Segment.h"
 #include "Option.h"
-#include "Util.h"
+#include "util.h"
 #include "message.h"
 #include "prefs.h"
 #include "LogFactory.h"
diff --git a/src/FtpNegotiationCommand.cc b/src/FtpNegotiationCommand.cc
index 2c7bc051..ce06d639 100644
--- a/src/FtpNegotiationCommand.cc
+++ b/src/FtpNegotiationCommand.cc
@@ -49,7 +49,7 @@
 #include "DlAbortEx.h"
 #include "message.h"
 #include "prefs.h"
-#include "Util.h"
+#include "util.h"
 #include "Option.h"
 #include "Logger.h"
 #include "Segment.h"
diff --git a/src/HandshakeExtensionMessage.cc b/src/HandshakeExtensionMessage.cc
index 6573b2a2..5ce2bd7f 100644
--- a/src/HandshakeExtensionMessage.cc
+++ b/src/HandshakeExtensionMessage.cc
@@ -34,7 +34,7 @@
 /* copyright --> */
 #include "HandshakeExtensionMessage.h"
 #include "Peer.h"
-#include "Util.h"
+#include "util.h"
 #include "DlAbortEx.h"
 #include "LogFactory.h"
 #include "Logger.h"
diff --git a/src/HttpConnection.cc b/src/HttpConnection.cc
index 19f3583f..4d2fb3a0 100644
--- a/src/HttpConnection.cc
+++ b/src/HttpConnection.cc
@@ -36,7 +36,7 @@
 
 #include <sstream>
 
-#include "Util.h"
+#include "util.h"
 #include "message.h"
 #include "prefs.h"
 #include "LogFactory.h"
diff --git a/src/HttpHeader.cc b/src/HttpHeader.cc
index ba8a9234..e70db2cc 100644
--- a/src/HttpHeader.cc
+++ b/src/HttpHeader.cc
@@ -37,7 +37,7 @@
 #include <istream>
 
 #include "Range.h"
-#include "Util.h"
+#include "util.h"
 #include "A2STR.h"
 
 namespace aria2 {
diff --git a/src/HttpHeaderProcessor.cc b/src/HttpHeaderProcessor.cc
index 51fe501b..53d036bd 100644
--- a/src/HttpHeaderProcessor.cc
+++ b/src/HttpHeaderProcessor.cc
@@ -39,7 +39,7 @@
 
 #include "HttpHeader.h"
 #include "message.h"
-#include "Util.h"
+#include "util.h"
 #include "DlRetryEx.h"
 #include "DlAbortEx.h"
 #include "A2STR.h"
diff --git a/src/HttpRequest.cc b/src/HttpRequest.cc
index d4dbad6f..84ad260d 100644
--- a/src/HttpRequest.cc
+++ b/src/HttpRequest.cc
@@ -42,7 +42,7 @@
 #include "Range.h"
 #include "CookieStorage.h"
 #include "Option.h"
-#include "Util.h"
+#include "util.h"
 #include "Base64.h"
 #include "prefs.h"
 #include "AuthConfigFactory.h"
diff --git a/src/HttpRequestCommand.cc b/src/HttpRequestCommand.cc
index 9ce7e5a9..d4bea72c 100644
--- a/src/HttpRequestCommand.cc
+++ b/src/HttpRequestCommand.cc
@@ -48,7 +48,7 @@
 #include "Socket.h"
 #include "prefs.h"
 #include "a2functional.h"
-#include "Util.h"
+#include "util.h"
 #include "CookieStorage.h"
 #include "AuthConfigFactory.h"
 #include "AuthConfig.h"
diff --git a/src/HttpResponse.cc b/src/HttpResponse.cc
index fce66f7e..f56abdd1 100644
--- a/src/HttpResponse.cc
+++ b/src/HttpResponse.cc
@@ -43,7 +43,7 @@
 #include "Range.h"
 #include "LogFactory.h"
 #include "Logger.h"
-#include "Util.h"
+#include "util.h"
 #include "message.h"
 #include "DlAbortEx.h"
 #include "DlRetryEx.h"
diff --git a/src/HttpResponseCommand.cc b/src/HttpResponseCommand.cc
index 682f0764..101b58c1 100644
--- a/src/HttpResponseCommand.cc
+++ b/src/HttpResponseCommand.cc
@@ -50,7 +50,7 @@
 #include "DefaultBtProgressInfoFile.h"
 #include "DownloadFailureException.h"
 #include "DlAbortEx.h"
-#include "Util.h"
+#include "util.h"
 #include "File.h"
 #include "Option.h"
 #include "Logger.h"
diff --git a/src/HttpServer.cc b/src/HttpServer.cc
index ec39253f..9483196c 100644
--- a/src/HttpServer.cc
+++ b/src/HttpServer.cc
@@ -41,7 +41,7 @@
 #include "HttpHeaderProcessor.h"
 #include "DlAbortEx.h"
 #include "message.h"
-#include "Util.h"
+#include "util.h"
 #include "LogFactory.h"
 #include "Logger.h"
 #include "Base64.h"
diff --git a/src/HttpServerCommand.cc b/src/HttpServerCommand.cc
index aa69ea13..b6c20754 100644
--- a/src/HttpServerCommand.cc
+++ b/src/HttpServerCommand.cc
@@ -45,7 +45,7 @@
 #include "RecoverableException.h"
 #include "prefs.h"
 #include "Option.h"
-#include "Util.h"
+#include "util.h"
 #include "DownloadContext.h"
 
 namespace aria2 {
diff --git a/src/HttpSkipResponseCommand.cc b/src/HttpSkipResponseCommand.cc
index 31322c1b..09a874a3 100644
--- a/src/HttpSkipResponseCommand.cc
+++ b/src/HttpSkipResponseCommand.cc
@@ -44,7 +44,7 @@
 #include "Logger.h"
 #include "HttpRequest.h"
 #include "Segment.h"
-#include "Util.h"
+#include "util.h"
 #include "StringFormat.h"
 #include "DlAbortEx.h"
 #include "HttpHeader.h"
diff --git a/src/IndexBtMessage.cc b/src/IndexBtMessage.cc
index 589248be..576db3a0 100644
--- a/src/IndexBtMessage.cc
+++ b/src/IndexBtMessage.cc
@@ -33,7 +33,7 @@
  */
 /* copyright --> */
 #include "IndexBtMessage.h"
-#include "Util.h"
+#include "util.h"
 #include "a2functional.h"
 #include "bittorrent_helper.h"
 
diff --git a/src/IteratableChecksumValidator.cc b/src/IteratableChecksumValidator.cc
index 5d59ab3f..799b7ad2 100644
--- a/src/IteratableChecksumValidator.cc
+++ b/src/IteratableChecksumValidator.cc
@@ -36,7 +36,7 @@
 
 #include <cstdlib>
 
-#include "Util.h"
+#include "util.h"
 #include "message.h"
 #include "PieceStorage.h"
 #include "messageDigest.h"
diff --git a/src/IteratableChunkChecksumValidator.cc b/src/IteratableChunkChecksumValidator.cc
index 98b1719e..dc8081e0 100644
--- a/src/IteratableChunkChecksumValidator.cc
+++ b/src/IteratableChunkChecksumValidator.cc
@@ -38,7 +38,7 @@
 #include <cstring>
 #include <cstdlib>
 
-#include "Util.h"
+#include "util.h"
 #include "message.h"
 #include "MessageDigestHelper.h"
 #include "DiskAdaptor.h"
diff --git a/src/MSEHandshake.cc b/src/MSEHandshake.cc
index 0e1f0c74..0f293ae0 100644
--- a/src/MSEHandshake.cc
+++ b/src/MSEHandshake.cc
@@ -49,7 +49,7 @@
 #include "ARC4Decryptor.h"
 #include "MessageDigestHelper.h"
 #include "SimpleRandomizer.h"
-#include "Util.h"
+#include "util.h"
 #include "DownloadContext.h"
 #include "prefs.h"
 #include "Option.h"
diff --git a/src/Makefile.am b/src/Makefile.am
index 36fac928..a3ea139e 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -30,7 +30,7 @@ SRCS =  Socket.h\
 	GrowSegment.cc GrowSegment.h\
 	PiecedSegment.cc PiecedSegment.h\
 	SegmentMan.cc SegmentMan.h\
-	Util.cc Util.h\
+	util.cc util.h\
 	Request.cc Request.h\
 	common.h\
 	message.h\
diff --git a/src/Makefile.in b/src/Makefile.in
index ad582868..d21dacc6 100644
--- a/src/Makefile.in
+++ b/src/Makefile.in
@@ -312,7 +312,7 @@ am__libaria2c_a_SOURCES_DIST = Socket.h SocketCore.cc SocketCore.h \
 	FtpTunnelResponseCommand.h SleepCommand.cc SleepCommand.h \
 	DownloadEngine.cc DownloadEngine.h Segment.h GrowSegment.cc \
 	GrowSegment.h PiecedSegment.cc PiecedSegment.h SegmentMan.cc \
-	SegmentMan.h Util.cc Util.h Request.cc Request.h common.h \
+	SegmentMan.h util.cc util.h Request.cc Request.h common.h \
 	message.h Exception.cc Exception.h FatalException.h \
 	RecoverableException.h DlAbortEx.h DlRetryEx.h \
 	DownloadFailureException.h Logger.cc Logger.h SimpleLogger.cc \
@@ -739,7 +739,7 @@ am__objects_27 = SocketCore.$(OBJEXT) Command.$(OBJEXT) \
 	FtpTunnelRequestCommand.$(OBJEXT) \
 	FtpTunnelResponseCommand.$(OBJEXT) SleepCommand.$(OBJEXT) \
 	DownloadEngine.$(OBJEXT) GrowSegment.$(OBJEXT) \
-	PiecedSegment.$(OBJEXT) SegmentMan.$(OBJEXT) Util.$(OBJEXT) \
+	PiecedSegment.$(OBJEXT) SegmentMan.$(OBJEXT) util.$(OBJEXT) \
 	Request.$(OBJEXT) Exception.$(OBJEXT) Logger.$(OBJEXT) \
 	SimpleLogger.$(OBJEXT) AbstractDiskWriter.$(OBJEXT) \
 	DefaultDiskWriter.$(OBJEXT) DefaultDiskWriterFactory.$(OBJEXT) \
@@ -1038,7 +1038,7 @@ SRCS = Socket.h SocketCore.cc SocketCore.h BinaryStream.h Command.cc \
 	FtpTunnelResponseCommand.h SleepCommand.cc SleepCommand.h \
 	DownloadEngine.cc DownloadEngine.h Segment.h GrowSegment.cc \
 	GrowSegment.h PiecedSegment.cc PiecedSegment.h SegmentMan.cc \
-	SegmentMan.h Util.cc Util.h Request.cc Request.h common.h \
+	SegmentMan.h util.cc util.h Request.cc Request.h common.h \
 	message.h Exception.cc Exception.h FatalException.h \
 	RecoverableException.h DlAbortEx.h DlRetryEx.h \
 	DownloadFailureException.h Logger.cc Logger.h SimpleLogger.cc \
@@ -1514,7 +1514,6 @@ distclean-compile:
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/UTPexExtensionMessage.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/UnknownLengthPieceStorage.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/UriListParser.Po@am__quote@
-@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/Util.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/XML2SAXMetalinkProcessor.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/Xml2XmlRpcRequestProcessor.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/XmlRpcElements.Po@am__quote@
@@ -1544,6 +1543,7 @@ distclean-compile:
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/prefs.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/strptime.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/timegm.Po@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/util.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/version_usage.Po@am__quote@
 
 .c.o:
diff --git a/src/MessageDigestHelper.cc b/src/MessageDigestHelper.cc
index c5a71307..93917f9b 100644
--- a/src/MessageDigestHelper.cc
+++ b/src/MessageDigestHelper.cc
@@ -37,7 +37,7 @@
 #include "DlAbortEx.h"
 #include "message.h"
 #include "DefaultDiskWriter.h"
-#include "Util.h"
+#include "util.h"
 #include "StringFormat.h"
 #include <cerrno>
 #include <cstring>
diff --git a/src/Metalink2RequestGroup.cc b/src/Metalink2RequestGroup.cc
index c70f01e9..8e74871c 100644
--- a/src/Metalink2RequestGroup.cc
+++ b/src/Metalink2RequestGroup.cc
@@ -41,7 +41,7 @@
 #include "LogFactory.h"
 #include "Logger.h"
 #include "prefs.h"
-#include "Util.h"
+#include "util.h"
 #include "message.h"
 #include "DownloadContext.h"
 #include "MetalinkHelper.h"
diff --git a/src/MetalinkEntry.cc b/src/MetalinkEntry.cc
index 8f1d1eaa..af8dfb0a 100644
--- a/src/MetalinkEntry.cc
+++ b/src/MetalinkEntry.cc
@@ -38,7 +38,7 @@
 
 #include "MetalinkResource.h"
 #include "FileEntry.h"
-#include "Util.h"
+#include "util.h"
 #include "a2functional.h"
 #ifdef ENABLE_MESSAGE_DIGEST
 # include "Checksum.h"
diff --git a/src/MetalinkParserController.cc b/src/MetalinkParserController.cc
index d6cfc923..5d154c34 100644
--- a/src/MetalinkParserController.cc
+++ b/src/MetalinkParserController.cc
@@ -49,7 +49,7 @@
 # include "messageDigest.h"
 #endif // ENABLE_MESSAGE_DIGEST
 #include "Signature.h"
-#include "Util.h"
+#include "util.h"
 
 namespace aria2 {
 
diff --git a/src/MetalinkParserStateImpl.cc b/src/MetalinkParserStateImpl.cc
index 14239381..27d0ff5c 100644
--- a/src/MetalinkParserStateImpl.cc
+++ b/src/MetalinkParserStateImpl.cc
@@ -35,7 +35,7 @@
 #include "MetalinkParserStateImpl.h"
 #include "MetalinkParserStateMachine.h"
 #include "RecoverableException.h"
-#include "Util.h"
+#include "util.h"
 
 namespace aria2 {
 
diff --git a/src/MultiDiskAdaptor.cc b/src/MultiDiskAdaptor.cc
index 2d0d1743..1f6f41e4 100644
--- a/src/MultiDiskAdaptor.cc
+++ b/src/MultiDiskAdaptor.cc
@@ -40,7 +40,7 @@
 
 #include "DefaultDiskWriter.h"
 #include "message.h"
-#include "Util.h"
+#include "util.h"
 #include "FileEntry.h"
 #include "MultiFileAllocationIterator.h"
 #include "DefaultDiskWriterFactory.h"
diff --git a/src/MultiUrlRequestInfo.cc b/src/MultiUrlRequestInfo.cc
index 20318146..d1c531a7 100644
--- a/src/MultiUrlRequestInfo.cc
+++ b/src/MultiUrlRequestInfo.cc
@@ -47,7 +47,7 @@
 #include "DownloadEngineFactory.h"
 #include "RecoverableException.h"
 #include "message.h"
-#include "Util.h"
+#include "util.h"
 #include "Option.h"
 #include "StatCalc.h"
 #include "CookieStorage.h"
diff --git a/src/NameMatchOptionHandler.h b/src/NameMatchOptionHandler.h
index c34a8279..cb68bab6 100644
--- a/src/NameMatchOptionHandler.h
+++ b/src/NameMatchOptionHandler.h
@@ -44,7 +44,7 @@
 #include <iterator>
 
 #include "A2STR.h"
-#include "Util.h"
+#include "util.h"
 #include "OptionHandlerException.h"
 
 #define NO_DESCRIPTION A2STR::NIL
diff --git a/src/NameResolver.cc b/src/NameResolver.cc
index 596cfd58..1bb28a80 100644
--- a/src/NameResolver.cc
+++ b/src/NameResolver.cc
@@ -36,7 +36,7 @@
 #include "DlAbortEx.h"
 #include "message.h"
 #include "StringFormat.h"
-#include "Util.h"
+#include "util.h"
 #include <cstring>
 
 namespace aria2 {
diff --git a/src/Netrc.cc b/src/Netrc.cc
index cbdffac8..cb60e977 100644
--- a/src/Netrc.cc
+++ b/src/Netrc.cc
@@ -41,7 +41,7 @@
 #include "DlAbortEx.h"
 #include "StringFormat.h"
 #include "A2STR.h"
-#include "Util.h"
+#include "util.h"
 
 namespace aria2 {
 
diff --git a/src/NsCookieParser.cc b/src/NsCookieParser.cc
index b5ec205c..be60e4e6 100644
--- a/src/NsCookieParser.cc
+++ b/src/NsCookieParser.cc
@@ -37,7 +37,7 @@
 #include <fstream>
 #include <vector>
 
-#include "Util.h"
+#include "util.h"
 #include "A2STR.h"
 #include "DlAbortEx.h"
 #include "StringFormat.h"
diff --git a/src/OptionHandlerFactory.cc b/src/OptionHandlerFactory.cc
index af4a48f0..6a695ef9 100644
--- a/src/OptionHandlerFactory.cc
+++ b/src/OptionHandlerFactory.cc
@@ -38,7 +38,7 @@
 #include "array_fun.h"
 #include "usage_text.h"
 #include "A2STR.h"
-#include "Util.h"
+#include "util.h"
 #include "help_tags.h"
 #include "StringFormat.h"
 #include "File.h"
diff --git a/src/OptionHandlerImpl.h b/src/OptionHandlerImpl.h
index ae3194b2..30b75d21 100644
--- a/src/OptionHandlerImpl.h
+++ b/src/OptionHandlerImpl.h
@@ -45,7 +45,7 @@
 #include <iterator>
 
 #include "NameMatchOptionHandler.h"
-#include "Util.h"
+#include "util.h"
 #include "DlAbortEx.h"
 #include "prefs.h"
 #include "Option.h"
diff --git a/src/OptionParser.cc b/src/OptionParser.cc
index 275944c4..4d208803 100644
--- a/src/OptionParser.cc
+++ b/src/OptionParser.cc
@@ -41,7 +41,7 @@
 #include <istream>
 #include <utility>
 
-#include "Util.h"
+#include "util.h"
 #include "OptionHandlerImpl.h"
 #include "Option.h"
 #include "A2STR.h"
diff --git a/src/ParameterizedStringParser.cc b/src/ParameterizedStringParser.cc
index 3752f1c6..dc6d750c 100644
--- a/src/ParameterizedStringParser.cc
+++ b/src/ParameterizedStringParser.cc
@@ -37,7 +37,7 @@
 #include <utility>
 
 #include "DlAbortEx.h"
-#include "Util.h"
+#include "util.h"
 #include "PStringSegment.h"
 #include "PStringSelect.h"
 #include "PStringNumLoop.h"
diff --git a/src/Peer.cc b/src/Peer.cc
index eebe23ae..16d694a6 100644
--- a/src/Peer.cc
+++ b/src/Peer.cc
@@ -37,7 +37,7 @@
 #include <cstring>
 #include <cassert>
 
-#include "Util.h"
+#include "util.h"
 #include "a2functional.h"
 #include "PeerSessionResource.h"
 #ifdef ENABLE_MESSAGE_DIGEST
diff --git a/src/PeerReceiveHandshakeCommand.cc b/src/PeerReceiveHandshakeCommand.cc
index 69ab8c37..8052dda5 100644
--- a/src/PeerReceiveHandshakeCommand.cc
+++ b/src/PeerReceiveHandshakeCommand.cc
@@ -36,7 +36,7 @@
 #include "PeerConnection.h"
 #include "DownloadEngine.h"
 #include "BtHandshakeMessage.h"
-#include "Util.h"
+#include "util.h"
 #include "DownloadContext.h"
 #include "DlAbortEx.h"
 #include "PeerInteractionCommand.h"
diff --git a/src/Piece.cc b/src/Piece.cc
index 72d25d7d..fdcd51c0 100644
--- a/src/Piece.cc
+++ b/src/Piece.cc
@@ -33,11 +33,11 @@
  */
 /* copyright --> */
 #include "Piece.h"
-#include "Util.h"
+#include "util.h"
 #include "BitfieldManFactory.h"
 #include "BitfieldMan.h"
 #include "A2STR.h"
-#include "Util.h"
+#include "util.h"
 #include "a2functional.h"
 #ifdef ENABLE_MESSAGE_DIGEST
 # include "messageDigest.h"
diff --git a/src/RangeBtMessage.cc b/src/RangeBtMessage.cc
index b060fbd1..dd54de32 100644
--- a/src/RangeBtMessage.cc
+++ b/src/RangeBtMessage.cc
@@ -33,7 +33,7 @@
  */
 /* copyright --> */
 #include "RangeBtMessage.h"
-#include "Util.h"
+#include "util.h"
 #include "a2functional.h"
 #include "bittorrent_helper.h"
 
diff --git a/src/Request.cc b/src/Request.cc
index 8341e4cf..a6fa8a1e 100644
--- a/src/Request.cc
+++ b/src/Request.cc
@@ -36,7 +36,7 @@
 
 #include <utility>
 
-#include "Util.h"
+#include "util.h"
 #include "FeatureConfig.h"
 #include "RecoverableException.h"
 #include "StringFormat.h"
diff --git a/src/RequestGroup.cc b/src/RequestGroup.cc
index 7961b2bd..b16b9989 100644
--- a/src/RequestGroup.cc
+++ b/src/RequestGroup.cc
@@ -47,7 +47,7 @@
 #include "CreateRequestCommand.h"
 #include "File.h"
 #include "message.h"
-#include "Util.h"
+#include "util.h"
 #include "LogFactory.h"
 #include "Logger.h"
 #include "DiskAdaptor.h"
diff --git a/src/RequestGroupMan.cc b/src/RequestGroupMan.cc
index ba88d7e4..e55eef7a 100644
--- a/src/RequestGroupMan.cc
+++ b/src/RequestGroupMan.cc
@@ -63,7 +63,7 @@
 #include "Option.h"
 #include "prefs.h"
 #include "File.h"
-#include "Util.h"
+#include "util.h"
 #include "Command.h"
 #include "FileEntry.h"
 
diff --git a/src/RequestSlot.cc b/src/RequestSlot.cc
index 01f83d70..e1838a35 100644
--- a/src/RequestSlot.cc
+++ b/src/RequestSlot.cc
@@ -33,7 +33,7 @@
  */
 /* copyright --> */
 #include "RequestSlot.h"
-#include "Util.h"
+#include "util.h"
 
 namespace aria2 {
 
diff --git a/src/SegmentMan.cc b/src/SegmentMan.cc
index 3b383588..0d157838 100644
--- a/src/SegmentMan.cc
+++ b/src/SegmentMan.cc
@@ -38,7 +38,7 @@
 #include <algorithm>
 #include <numeric>
 
-#include "Util.h"
+#include "util.h"
 #include "message.h"
 #include "prefs.h"
 #include "PiecedSegment.h"
diff --git a/src/ServerStatMan.cc b/src/ServerStatMan.cc
index efb30757..e1e12a8b 100644
--- a/src/ServerStatMan.cc
+++ b/src/ServerStatMan.cc
@@ -41,7 +41,7 @@
 #include <vector>
 
 #include "ServerStat.h"
-#include "Util.h"
+#include "util.h"
 #include "RecoverableException.h"
 
 namespace aria2 {
diff --git a/src/SimpleLogger.cc b/src/SimpleLogger.cc
index 2baeaa44..d9cf1fa5 100644
--- a/src/SimpleLogger.cc
+++ b/src/SimpleLogger.cc
@@ -36,7 +36,7 @@
 
 #include <cassert>
 
-#include "Util.h"
+#include "util.h"
 #include "a2time.h"
 #include "A2STR.h"
 #include "StringFormat.h"
diff --git a/src/SingleFileAllocationIterator.cc b/src/SingleFileAllocationIterator.cc
index 52b8b382..cbf6d214 100644
--- a/src/SingleFileAllocationIterator.cc
+++ b/src/SingleFileAllocationIterator.cc
@@ -34,7 +34,7 @@
 /* copyright --> */
 #include "SingleFileAllocationIterator.h"
 #include "BinaryStream.h"
-#include "Util.h"
+#include "util.h"
 #include "a2io.h"
 #include <cstring>
 #include <cstdlib>
diff --git a/src/SocketCore.cc b/src/SocketCore.cc
index 986c256b..423d5efd 100644
--- a/src/SocketCore.cc
+++ b/src/SocketCore.cc
@@ -48,7 +48,7 @@
 #include "DlRetryEx.h"
 #include "DlAbortEx.h"
 #include "StringFormat.h"
-#include "Util.h"
+#include "util.h"
 #include "TimeA2.h"
 #include "a2functional.h"
 #ifdef ENABLE_SSL
diff --git a/src/Sqlite3MozCookieParser.cc b/src/Sqlite3MozCookieParser.cc
index 497a4066..d17a3a5f 100644
--- a/src/Sqlite3MozCookieParser.cc
+++ b/src/Sqlite3MozCookieParser.cc
@@ -39,7 +39,7 @@
 #include <sqlite3.h>
 
 #include "DlAbortEx.h"
-#include "Util.h"
+#include "util.h"
 #include "StringFormat.h"
 #include "A2STR.h"
 #ifndef HAVE_SQLITE3_OPEN_V2
diff --git a/src/TimeA2.cc b/src/TimeA2.cc
index 05705305..955cb07c 100644
--- a/src/TimeA2.cc
+++ b/src/TimeA2.cc
@@ -37,7 +37,7 @@
 
 #include <cstring>
 
-#include "Util.h"
+#include "util.h"
 #include "array_fun.h"
 
 namespace aria2 {
diff --git a/src/UTPexExtensionMessage.cc b/src/UTPexExtensionMessage.cc
index 7031a90e..27eb0755 100644
--- a/src/UTPexExtensionMessage.cc
+++ b/src/UTPexExtensionMessage.cc
@@ -34,7 +34,7 @@
 /* copyright --> */
 #include "UTPexExtensionMessage.h"
 #include "Peer.h"
-#include "Util.h"
+#include "util.h"
 #include "bittorrent_helper.h"
 #include "PeerStorage.h"
 #include "PeerListProcessor.h"
diff --git a/src/UriListParser.cc b/src/UriListParser.cc
index 1a6ed3dc..f2c62b60 100644
--- a/src/UriListParser.cc
+++ b/src/UriListParser.cc
@@ -37,7 +37,7 @@
 #include <istream>
 #include <sstream>
 
-#include "Util.h"
+#include "util.h"
 #include "Option.h"
 #include "OptionHandlerFactory.h"
 #include "OptionHandler.h"
diff --git a/src/XML2SAXMetalinkProcessor.cc b/src/XML2SAXMetalinkProcessor.cc
index 39061101..15a0e3f9 100644
--- a/src/XML2SAXMetalinkProcessor.cc
+++ b/src/XML2SAXMetalinkProcessor.cc
@@ -37,7 +37,7 @@
 #include "MetalinkParserStateMachine.h"
 #include "Metalinker.h"
 #include "MetalinkEntry.h"
-#include "Util.h"
+#include "util.h"
 #include "message.h"
 #include "DlAbortEx.h"
 
diff --git a/src/Xml2XmlRpcRequestProcessor.cc b/src/Xml2XmlRpcRequestProcessor.cc
index 0a568606..e88966bc 100644
--- a/src/Xml2XmlRpcRequestProcessor.cc
+++ b/src/Xml2XmlRpcRequestProcessor.cc
@@ -39,7 +39,7 @@
 #include <libxml/parser.h>
 
 #include "XmlRpcRequestParserStateMachine.h"
-#include "Util.h"
+#include "util.h"
 #include "DlAbortEx.h"
 #include "message.h"
 
diff --git a/src/XmlRpcMethodImpl.cc b/src/XmlRpcMethodImpl.cc
index ed97d6e5..9f90d228 100644
--- a/src/XmlRpcMethodImpl.cc
+++ b/src/XmlRpcMethodImpl.cc
@@ -46,7 +46,7 @@
 #include "DownloadEngine.h"
 #include "RequestGroup.h"
 #include "download_helper.h"
-#include "Util.h"
+#include "util.h"
 #include "RequestGroupMan.h"
 #include "StringFormat.h"
 #include "XmlRpcRequest.h"
diff --git a/src/XmlRpcRequestParserStateImpl.cc b/src/XmlRpcRequestParserStateImpl.cc
index b4c4764a..a18a7e65 100644
--- a/src/XmlRpcRequestParserStateImpl.cc
+++ b/src/XmlRpcRequestParserStateImpl.cc
@@ -36,7 +36,7 @@
 #include "XmlRpcRequestParserStateMachine.h"
 #include "XmlRpcElements.h"
 #include "RecoverableException.h"
-#include "Util.h"
+#include "util.h"
 #include "Base64.h"
 
 namespace aria2 {
diff --git a/src/XmlRpcResponse.cc b/src/XmlRpcResponse.cc
index bccc95a5..4cc09b21 100644
--- a/src/XmlRpcResponse.cc
+++ b/src/XmlRpcResponse.cc
@@ -37,7 +37,7 @@
 #include <cassert>
 #include <sstream>
 
-#include "Util.h"
+#include "util.h"
 
 namespace aria2 {
 
diff --git a/src/bitfield.h b/src/bitfield.h
index 26f4d024..38d3b0a7 100644
--- a/src/bitfield.h
+++ b/src/bitfield.h
@@ -40,7 +40,7 @@
 #include <cassert>
 #include <cstdlib>
 
-#include "Util.h"
+#include "util.h"
 
 namespace aria2 {
 
diff --git a/src/bittorrent_helper.cc b/src/bittorrent_helper.cc
index 7b55f12a..60bc11bc 100644
--- a/src/bittorrent_helper.cc
+++ b/src/bittorrent_helper.cc
@@ -41,7 +41,7 @@
 #include "DownloadContext.h"
 #include "Randomizer.h"
 #include "bencode.h"
-#include "Util.h"
+#include "util.h"
 #include "DlAbortEx.h"
 #include "message.h"
 #include "StringFormat.h"
diff --git a/src/bittorrent_helper.h b/src/bittorrent_helper.h
index c9d64579..bc9c8fe9 100644
--- a/src/bittorrent_helper.h
+++ b/src/bittorrent_helper.h
@@ -45,7 +45,7 @@
 #include "SharedHandle.h"
 #include "AnnounceTier.h"
 #include "BDE.h"
-#include "Util.h"
+#include "util.h"
 
 namespace aria2 {
 
diff --git a/src/download_helper.cc b/src/download_helper.cc
index 418ea96c..900604ac 100644
--- a/src/download_helper.cc
+++ b/src/download_helper.cc
@@ -56,7 +56,7 @@
 #include "FileEntry.h"
 #include "LogFactory.h"
 #include "File.h"
-#include "Util.h"
+#include "util.h"
 #include "array_fun.h"
 #include "OptionHandler.h"
 #include "ByteArrayDiskWriter.h"
diff --git a/src/main.cc b/src/main.cc
index d5b4ab19..62a14e28 100644
--- a/src/main.cc
+++ b/src/main.cc
@@ -46,7 +46,7 @@
 #include "SharedHandle.h"
 #include "LogFactory.h"
 #include "Logger.h"
-#include "Util.h"
+#include "util.h"
 #include "BitfieldManFactory.h"
 #include "FeatureConfig.h"
 #include "MultiUrlRequestInfo.h"
diff --git a/src/messageDigest.cc b/src/messageDigest.cc
index 1f498edd..06e79704 100644
--- a/src/messageDigest.cc
+++ b/src/messageDigest.cc
@@ -33,7 +33,7 @@
  */
 /* copyright --> */
 #include "messageDigest.h"
-#include "Util.h"
+#include "util.h"
 
 namespace aria2 {
 
diff --git a/src/option_processing.cc b/src/option_processing.cc
index 6ae461a6..847b4f55 100644
--- a/src/option_processing.cc
+++ b/src/option_processing.cc
@@ -45,7 +45,7 @@
 #include "OptionParser.h"
 #include "OptionHandlerFactory.h"
 #include "OptionHandler.h"
-#include "Util.h"
+#include "util.h"
 #include "message.h"
 #include "Exception.h"
 #include "a2io.h"
diff --git a/src/Util.cc b/src/util.cc
similarity index 99%
rename from src/Util.cc
rename to src/util.cc
index 77532c61..bcaa1a77 100644
--- a/src/Util.cc
+++ b/src/util.cc
@@ -32,7 +32,7 @@
  * files in the program, then also delete it here.
  */
 /* copyright --> */
-#include "Util.h"
+#include "util.h"
 
 #include <signal.h>
 #include <limits.h>
diff --git a/src/Util.h b/src/util.h
similarity index 100%
rename from src/Util.h
rename to src/util.h
diff --git a/src/version_usage.cc b/src/version_usage.cc
index 8658faf6..746cca59 100644
--- a/src/version_usage.cc
+++ b/src/version_usage.cc
@@ -49,7 +49,7 @@
 #include "StringFormat.h"
 #include "OptionParser.h"
 #include "OptionHandler.h"
-#include "Util.h"
+#include "util.h"
 
 namespace aria2 {
 
diff --git a/test/ARC4Test.cc b/test/ARC4Test.cc
index 804d749b..0f6b672b 100644
--- a/test/ARC4Test.cc
+++ b/test/ARC4Test.cc
@@ -5,7 +5,7 @@
 
 #include "ARC4Decryptor.h"
 #include "Exception.h"
-#include "Util.h"
+#include "util.h"
 
 namespace aria2 {
 
diff --git a/test/BDETest.cc b/test/BDETest.cc
index e311cf86..b70da967 100644
--- a/test/BDETest.cc
+++ b/test/BDETest.cc
@@ -4,7 +4,7 @@
 
 #include <cppunit/extensions/HelperMacros.h>
 
-#include "Util.h"
+#include "util.h"
 
 namespace aria2 {
 
diff --git a/test/BNodeTest.cc b/test/BNodeTest.cc
index a01329d2..0cf1d8a2 100644
--- a/test/BNodeTest.cc
+++ b/test/BNodeTest.cc
@@ -6,7 +6,7 @@
 #include "DHTNode.h"
 #include "DHTBucket.h"
 #include "Exception.h"
-#include "Util.h"
+#include "util.h"
 
 namespace aria2 {
 
diff --git a/test/BittorrentHelperTest.cc b/test/BittorrentHelperTest.cc
index 0d498c61..246a98d0 100644
--- a/test/BittorrentHelperTest.cc
+++ b/test/BittorrentHelperTest.cc
@@ -6,7 +6,7 @@
 #include <cppunit/extensions/HelperMacros.h>
 
 #include "DownloadContext.h"
-#include "Util.h"
+#include "util.h"
 #include "RecoverableException.h"
 #include "AnnounceTier.h"
 #include "FixedNumberRandomizer.h"
diff --git a/test/BtAllowedFastMessageTest.cc b/test/BtAllowedFastMessageTest.cc
index 8bd7b162..0a180d84 100644
--- a/test/BtAllowedFastMessageTest.cc
+++ b/test/BtAllowedFastMessageTest.cc
@@ -4,7 +4,7 @@
 #include <cppunit/extensions/HelperMacros.h>
 
 #include "bittorrent_helper.h"
-#include "Util.h"
+#include "util.h"
 #include "Peer.h"
 
 namespace aria2 {
diff --git a/test/BtBitfieldMessageTest.cc b/test/BtBitfieldMessageTest.cc
index 68fbd042..5f51c6c9 100644
--- a/test/BtBitfieldMessageTest.cc
+++ b/test/BtBitfieldMessageTest.cc
@@ -5,7 +5,7 @@
 #include <cppunit/extensions/HelperMacros.h>
 
 #include "bittorrent_helper.h"
-#include "Util.h"
+#include "util.h"
 #include "Peer.h"
 #include "MockPieceStorage.h"
 #include "DlAbortEx.h"
diff --git a/test/BtHandshakeMessageTest.cc b/test/BtHandshakeMessageTest.cc
index c70ed360..b49f2227 100644
--- a/test/BtHandshakeMessageTest.cc
+++ b/test/BtHandshakeMessageTest.cc
@@ -4,7 +4,7 @@
 
 #include <cppunit/extensions/HelperMacros.h>
 
-#include "Util.h"
+#include "util.h"
 #include "BtConstants.h"
 
 namespace aria2 {
diff --git a/test/BtPortMessageTest.cc b/test/BtPortMessageTest.cc
index b2ebe841..8f212d70 100644
--- a/test/BtPortMessageTest.cc
+++ b/test/BtPortMessageTest.cc
@@ -5,7 +5,7 @@
 #include <cppunit/extensions/HelperMacros.h>
 
 #include "bittorrent_helper.h"
-#include "Util.h"
+#include "util.h"
 #include "array_fun.h"
 #include "Peer.h"
 #include "DHTNode.h"
diff --git a/test/CookieStorageTest.cc b/test/CookieStorageTest.cc
index 7c6957f4..29044a6b 100644
--- a/test/CookieStorageTest.cc
+++ b/test/CookieStorageTest.cc
@@ -6,7 +6,7 @@
 #include <cppunit/extensions/HelperMacros.h>
 
 #include "Exception.h"
-#include "Util.h"
+#include "util.h"
 #include "TimeA2.h"
 #include "CookieParser.h"
 #include "RecoverableException.h"
diff --git a/test/CookieTest.cc b/test/CookieTest.cc
index 0ec0727e..e18bf96d 100644
--- a/test/CookieTest.cc
+++ b/test/CookieTest.cc
@@ -5,7 +5,7 @@
 #include <cppunit/extensions/HelperMacros.h>
 
 #include "Exception.h"
-#include "Util.h"
+#include "util.h"
 #include "TimeA2.h"
 
 namespace aria2 {
diff --git a/test/DHKeyExchangeTest.cc b/test/DHKeyExchangeTest.cc
index 8c31d6eb..4ec10ecf 100644
--- a/test/DHKeyExchangeTest.cc
+++ b/test/DHKeyExchangeTest.cc
@@ -1,6 +1,6 @@
 #include "DHKeyExchange.h"
 #include "Exception.h"
-#include "Util.h"
+#include "util.h"
 #include <cppunit/extensions/HelperMacros.h>
 
 namespace aria2 {
diff --git a/test/DHTAnnouncePeerMessageTest.cc b/test/DHTAnnouncePeerMessageTest.cc
index 698d0201..e1908154 100644
--- a/test/DHTAnnouncePeerMessageTest.cc
+++ b/test/DHTAnnouncePeerMessageTest.cc
@@ -4,7 +4,7 @@
 
 #include "DHTNode.h"
 #include "Exception.h"
-#include "Util.h"
+#include "util.h"
 #include "MockDHTMessageFactory.h"
 #include "MockDHTMessageDispatcher.h"
 #include "MockDHTMessage.h"
diff --git a/test/DHTAnnouncePeerReplyMessageTest.cc b/test/DHTAnnouncePeerReplyMessageTest.cc
index af3ab22e..de7e0f92 100644
--- a/test/DHTAnnouncePeerReplyMessageTest.cc
+++ b/test/DHTAnnouncePeerReplyMessageTest.cc
@@ -4,7 +4,7 @@
 
 #include "DHTNode.h"
 #include "Exception.h"
-#include "Util.h"
+#include "util.h"
 #include "bencode.h"
 
 namespace aria2 {
diff --git a/test/DHTBucketTest.cc b/test/DHTBucketTest.cc
index 28ce240b..3ee56497 100644
--- a/test/DHTBucketTest.cc
+++ b/test/DHTBucketTest.cc
@@ -7,7 +7,7 @@
 
 #include "DHTNode.h"
 #include "Exception.h"
-#include "Util.h"
+#include "util.h"
 
 namespace aria2 {
 
diff --git a/test/DHTFindNodeMessageTest.cc b/test/DHTFindNodeMessageTest.cc
index 93354586..8e01b2b3 100644
--- a/test/DHTFindNodeMessageTest.cc
+++ b/test/DHTFindNodeMessageTest.cc
@@ -4,7 +4,7 @@
 
 #include "DHTNode.h"
 #include "Exception.h"
-#include "Util.h"
+#include "util.h"
 #include "MockDHTMessageFactory.h"
 #include "MockDHTMessage.h"
 #include "MockDHTMessageDispatcher.h"
diff --git a/test/DHTFindNodeReplyMessageTest.cc b/test/DHTFindNodeReplyMessageTest.cc
index 0e58e60d..e5bba6b1 100644
--- a/test/DHTFindNodeReplyMessageTest.cc
+++ b/test/DHTFindNodeReplyMessageTest.cc
@@ -4,7 +4,7 @@
 
 #include "DHTNode.h"
 #include "Exception.h"
-#include "Util.h"
+#include "util.h"
 #include "DHTBucket.h"
 #include "bittorrent_helper.h"
 #include "bencode.h"
diff --git a/test/DHTGetPeersMessageTest.cc b/test/DHTGetPeersMessageTest.cc
index bbe96ccb..28c5d229 100644
--- a/test/DHTGetPeersMessageTest.cc
+++ b/test/DHTGetPeersMessageTest.cc
@@ -4,7 +4,7 @@
 
 #include "DHTNode.h"
 #include "Exception.h"
-#include "Util.h"
+#include "util.h"
 #include "MockDHTMessageFactory.h"
 #include "MockDHTMessage.h"
 #include "MockDHTMessageDispatcher.h"
diff --git a/test/DHTGetPeersReplyMessageTest.cc b/test/DHTGetPeersReplyMessageTest.cc
index b509b8a3..b3176365 100644
--- a/test/DHTGetPeersReplyMessageTest.cc
+++ b/test/DHTGetPeersReplyMessageTest.cc
@@ -4,7 +4,7 @@
 
 #include "DHTNode.h"
 #include "Exception.h"
-#include "Util.h"
+#include "util.h"
 #include "DHTBucket.h"
 #include "bittorrent_helper.h"
 #include "Peer.h"
diff --git a/test/DHTIDCloserTest.cc b/test/DHTIDCloserTest.cc
index e5d3cdf5..09a0e519 100644
--- a/test/DHTIDCloserTest.cc
+++ b/test/DHTIDCloserTest.cc
@@ -2,7 +2,7 @@
 #include "DHTNodeLookupEntry.h"
 #include "DHTIDCloser.h"
 #include "Exception.h"
-#include "Util.h"
+#include "util.h"
 #include <cstring>
 #include <algorithm>
 #include <cppunit/extensions/HelperMacros.h>
diff --git a/test/DHTMessageFactoryImplTest.cc b/test/DHTMessageFactoryImplTest.cc
index c312bd6f..de0af760 100644
--- a/test/DHTMessageFactoryImplTest.cc
+++ b/test/DHTMessageFactoryImplTest.cc
@@ -6,7 +6,7 @@
 #include <cppunit/extensions/HelperMacros.h>
 
 #include "RecoverableException.h"
-#include "Util.h"
+#include "util.h"
 #include "DHTNode.h"
 #include "DHTRoutingTable.h"
 #include "Peer.h"
diff --git a/test/DHTMessageTrackerEntryTest.cc b/test/DHTMessageTrackerEntryTest.cc
index 9dea3874..891fd4b9 100644
--- a/test/DHTMessageTrackerEntryTest.cc
+++ b/test/DHTMessageTrackerEntryTest.cc
@@ -5,7 +5,7 @@
 #include <cppunit/extensions/HelperMacros.h>
 
 #include "Exception.h"
-#include "Util.h"
+#include "util.h"
 #include "MockDHTMessage.h"
 #include "DHTNode.h"
 #include "DHTMessageCallback.h"
diff --git a/test/DHTMessageTrackerTest.cc b/test/DHTMessageTrackerTest.cc
index cd4d5d2e..0b8e49a4 100644
--- a/test/DHTMessageTrackerTest.cc
+++ b/test/DHTMessageTrackerTest.cc
@@ -3,7 +3,7 @@
 #include <cppunit/extensions/HelperMacros.h>
 
 #include "Exception.h"
-#include "Util.h"
+#include "util.h"
 #include "MockDHTMessage.h"
 #include "MockDHTMessageCallback.h"
 #include "DHTNode.h"
diff --git a/test/DHTNodeTest.cc b/test/DHTNodeTest.cc
index 179ead55..3ec16ab4 100644
--- a/test/DHTNodeTest.cc
+++ b/test/DHTNodeTest.cc
@@ -1,6 +1,6 @@
 #include "DHTNode.h"
 #include "Exception.h"
-#include "Util.h"
+#include "util.h"
 #include <iostream>
 #include <cppunit/extensions/HelperMacros.h>
 
diff --git a/test/DHTPeerAnnounceEntryTest.cc b/test/DHTPeerAnnounceEntryTest.cc
index b679d783..cc79afce 100644
--- a/test/DHTPeerAnnounceEntryTest.cc
+++ b/test/DHTPeerAnnounceEntryTest.cc
@@ -5,7 +5,7 @@
 #include <cppunit/extensions/HelperMacros.h>
 
 #include "Exception.h"
-#include "Util.h"
+#include "util.h"
 #include "MockPeerStorage.h"
 #include "FileEntry.h"
 
diff --git a/test/DHTPeerAnnounceStorageTest.cc b/test/DHTPeerAnnounceStorageTest.cc
index 698fc72a..48a3d71a 100644
--- a/test/DHTPeerAnnounceStorageTest.cc
+++ b/test/DHTPeerAnnounceStorageTest.cc
@@ -5,7 +5,7 @@
 #include <cppunit/extensions/HelperMacros.h>
 
 #include "Exception.h"
-#include "Util.h"
+#include "util.h"
 #include "DownloadContext.h"
 #include "MockPeerStorage.h"
 #include "DHTConstants.h"
diff --git a/test/DHTPingMessageTest.cc b/test/DHTPingMessageTest.cc
index af93b854..e81983e6 100644
--- a/test/DHTPingMessageTest.cc
+++ b/test/DHTPingMessageTest.cc
@@ -4,7 +4,7 @@
 
 #include "DHTNode.h"
 #include "Exception.h"
-#include "Util.h"
+#include "util.h"
 #include "MockDHTMessageFactory.h"
 #include "MockDHTMessageDispatcher.h"
 #include "MockDHTMessage.h"
diff --git a/test/DHTPingReplyMessageTest.cc b/test/DHTPingReplyMessageTest.cc
index d8fdb5b8..38a4dbde 100644
--- a/test/DHTPingReplyMessageTest.cc
+++ b/test/DHTPingReplyMessageTest.cc
@@ -4,7 +4,7 @@
 
 #include "DHTNode.h"
 #include "Exception.h"
-#include "Util.h"
+#include "util.h"
 #include "bencode.h"
 
 namespace aria2 {
diff --git a/test/DHTRoutingTableDeserializerTest.cc b/test/DHTRoutingTableDeserializerTest.cc
index ee4ab142..f5026b8e 100644
--- a/test/DHTRoutingTableDeserializerTest.cc
+++ b/test/DHTRoutingTableDeserializerTest.cc
@@ -8,7 +8,7 @@
 
 #include "DHTRoutingTableSerializer.h"
 #include "Exception.h"
-#include "Util.h"
+#include "util.h"
 #include "DHTNode.h"
 #include "array_fun.h"
 #include "DHTConstants.h"
diff --git a/test/DHTRoutingTableSerializerTest.cc b/test/DHTRoutingTableSerializerTest.cc
index 428b2e34..09409c76 100644
--- a/test/DHTRoutingTableSerializerTest.cc
+++ b/test/DHTRoutingTableSerializerTest.cc
@@ -1,6 +1,6 @@
 #include "DHTRoutingTableSerializer.h"
 #include "Exception.h"
-#include "Util.h"
+#include "util.h"
 #include "DHTNode.h"
 #include "array_fun.h"
 #include "DHTConstants.h"
diff --git a/test/DHTRoutingTableTest.cc b/test/DHTRoutingTableTest.cc
index 486da953..67a3bb9f 100644
--- a/test/DHTRoutingTableTest.cc
+++ b/test/DHTRoutingTableTest.cc
@@ -4,7 +4,7 @@
 #include <cppunit/extensions/HelperMacros.h>
 
 #include "Exception.h"
-#include "Util.h"
+#include "util.h"
 #include "DHTNode.h"
 #include "DHTBucket.h"
 #include "MockDHTTaskQueue.h"
diff --git a/test/DHTTokenTrackerTest.cc b/test/DHTTokenTrackerTest.cc
index 990e4e09..da779ac5 100644
--- a/test/DHTTokenTrackerTest.cc
+++ b/test/DHTTokenTrackerTest.cc
@@ -3,7 +3,7 @@
 #include <cppunit/extensions/HelperMacros.h>
 
 #include "Exception.h"
-#include "Util.h"
+#include "util.h"
 #include "DHTConstants.h"
 
 namespace aria2 {
diff --git a/test/DefaultBtAnnounceTest.cc b/test/DefaultBtAnnounceTest.cc
index 8205c3f9..78d8d9ce 100644
--- a/test/DefaultBtAnnounceTest.cc
+++ b/test/DefaultBtAnnounceTest.cc
@@ -5,7 +5,7 @@
 #include <cppunit/extensions/HelperMacros.h>
 
 #include "Option.h"
-#include "Util.h"
+#include "util.h"
 #include "Exception.h"
 #include "MockPieceStorage.h"
 #include "MockPeerStorage.h"
diff --git a/test/DefaultBtMessageDispatcherTest.cc b/test/DefaultBtMessageDispatcherTest.cc
index 4c620406..6e37e531 100644
--- a/test/DefaultBtMessageDispatcherTest.cc
+++ b/test/DefaultBtMessageDispatcherTest.cc
@@ -4,7 +4,7 @@
 
 #include <cppunit/extensions/HelperMacros.h>
 
-#include "Util.h"
+#include "util.h"
 #include "Exception.h"
 #include "MockPieceStorage.h"
 #include "MockPeerStorage.h"
diff --git a/test/DefaultBtProgressInfoFileTest.cc b/test/DefaultBtProgressInfoFileTest.cc
index 0e077e1a..cbdbb15b 100644
--- a/test/DefaultBtProgressInfoFileTest.cc
+++ b/test/DefaultBtProgressInfoFileTest.cc
@@ -5,7 +5,7 @@
 #include <cppunit/extensions/HelperMacros.h>
 
 #include "Option.h"
-#include "Util.h"
+#include "util.h"
 #include "Exception.h"
 #include "MockPieceStorage.h"
 #include "prefs.h"
diff --git a/test/DefaultPeerStorageTest.cc b/test/DefaultPeerStorageTest.cc
index 6779cacd..8f910c9c 100644
--- a/test/DefaultPeerStorageTest.cc
+++ b/test/DefaultPeerStorageTest.cc
@@ -4,7 +4,7 @@
 
 #include <cppunit/extensions/HelperMacros.h>
 
-#include "Util.h"
+#include "util.h"
 #include "Exception.h"
 #include "Peer.h"
 #include "Option.h"
diff --git a/test/DefaultPieceStorageTest.cc b/test/DefaultPieceStorageTest.cc
index ef787c19..9693ca27 100644
--- a/test/DefaultPieceStorageTest.cc
+++ b/test/DefaultPieceStorageTest.cc
@@ -2,7 +2,7 @@
 
 #include <cppunit/extensions/HelperMacros.h>
 
-#include "Util.h"
+#include "util.h"
 #include "Exception.h"
 #include "FixedNumberRandomizer.h"
 #include "BitfieldManFactory.h"
diff --git a/test/DirectDiskAdaptorTest.cc b/test/DirectDiskAdaptorTest.cc
index b393ffb2..d5c642a2 100644
--- a/test/DirectDiskAdaptorTest.cc
+++ b/test/DirectDiskAdaptorTest.cc
@@ -5,7 +5,7 @@
 #include "FileEntry.h"
 #include "DefaultDiskWriter.h"
 #include "Exception.h"
-#include "Util.h"
+#include "util.h"
 #include "TestUtil.h"
 
 namespace aria2 {
diff --git a/test/DownloadHelperTest.cc b/test/DownloadHelperTest.cc
index 7255d63b..f0b9d393 100644
--- a/test/DownloadHelperTest.cc
+++ b/test/DownloadHelperTest.cc
@@ -13,7 +13,7 @@
 #include "array_fun.h"
 #include "prefs.h"
 #include "Exception.h"
-#include "Util.h"
+#include "util.h"
 
 namespace aria2 {
 
diff --git a/test/FeatureConfigTest.cc b/test/FeatureConfigTest.cc
index c2feb3a8..f28260a4 100644
--- a/test/FeatureConfigTest.cc
+++ b/test/FeatureConfigTest.cc
@@ -6,7 +6,7 @@
 
 #include "a2functional.h"
 #include "array_fun.h"
-#include "Util.h"
+#include "util.h"
 
 namespace aria2 {
 
diff --git a/test/FeedbackURISelectorTest.cc b/test/FeedbackURISelectorTest.cc
index 783f5680..4e3c33eb 100644
--- a/test/FeedbackURISelectorTest.cc
+++ b/test/FeedbackURISelectorTest.cc
@@ -3,7 +3,7 @@
 #include <cppunit/extensions/HelperMacros.h>
 
 #include "Exception.h"
-#include "Util.h"
+#include "util.h"
 #include "array_fun.h"
 #include "ServerStatMan.h"
 #include "ServerStat.h"
diff --git a/test/FtpConnectionTest.cc b/test/FtpConnectionTest.cc
index 5d636a40..caad1965 100644
--- a/test/FtpConnectionTest.cc
+++ b/test/FtpConnectionTest.cc
@@ -6,7 +6,7 @@
 #include <cppunit/extensions/HelperMacros.h>
 
 #include "Exception.h"
-#include "Util.h"
+#include "util.h"
 #include "SocketCore.h"
 #include "Request.h"
 #include "Option.h"
diff --git a/test/GZipDecoderTest.cc b/test/GZipDecoderTest.cc
index c42019fc..31aa8f2f 100644
--- a/test/GZipDecoderTest.cc
+++ b/test/GZipDecoderTest.cc
@@ -1,6 +1,6 @@
 #include "GZipDecoder.h"
 #include "Exception.h"
-#include "Util.h"
+#include "util.h"
 #ifdef ENABLE_MESSAGE_DIGEST
 # include "MessageDigestHelper.h"
 #endif // ENABLE_MESSAGE_DIGEST
diff --git a/test/HttpRequestTest.cc b/test/HttpRequestTest.cc
index 99d3e6aa..9c1f9cc3 100644
--- a/test/HttpRequestTest.cc
+++ b/test/HttpRequestTest.cc
@@ -13,7 +13,7 @@
 #include "Option.h"
 #include "array_fun.h"
 #include "CookieStorage.h"
-#include "Util.h"
+#include "util.h"
 #include "AuthConfig.h"
 
 namespace aria2 {
diff --git a/test/InOrderURISelectorTest.cc b/test/InOrderURISelectorTest.cc
index 3663a9f9..9efc2f3c 100644
--- a/test/InOrderURISelectorTest.cc
+++ b/test/InOrderURISelectorTest.cc
@@ -3,7 +3,7 @@
 #include <cppunit/extensions/HelperMacros.h>
 
 #include "Exception.h"
-#include "Util.h"
+#include "util.h"
 #include "array_fun.h"
 #include "FileEntry.h"
 
diff --git a/test/MSEHandshakeTest.cc b/test/MSEHandshakeTest.cc
index 3eb78b5c..9750304f 100644
--- a/test/MSEHandshakeTest.cc
+++ b/test/MSEHandshakeTest.cc
@@ -5,7 +5,7 @@
 #include <cppunit/extensions/HelperMacros.h>
 
 #include "Exception.h"
-#include "Util.h"
+#include "util.h"
 #include "prefs.h"
 #include "Socket.h"
 #include "Option.h"
diff --git a/test/MessageDigestHelperTest.cc b/test/MessageDigestHelperTest.cc
index 576d3c03..b07bd48a 100644
--- a/test/MessageDigestHelperTest.cc
+++ b/test/MessageDigestHelperTest.cc
@@ -2,7 +2,7 @@
 
 #include <cppunit/extensions/HelperMacros.h>
 
-#include "Util.h"
+#include "util.h"
 #include "DefaultDiskWriter.h"
 
 namespace aria2 {
diff --git a/test/NsCookieParserTest.cc b/test/NsCookieParserTest.cc
index 055e9c14..21ca56c6 100644
--- a/test/NsCookieParserTest.cc
+++ b/test/NsCookieParserTest.cc
@@ -5,7 +5,7 @@
 #include <cppunit/extensions/HelperMacros.h>
 
 #include "RecoverableException.h"
-#include "Util.h"
+#include "util.h"
 
 namespace aria2 {
 
diff --git a/test/OptionParserTest.cc b/test/OptionParserTest.cc
index e4188123..f70b32ef 100644
--- a/test/OptionParserTest.cc
+++ b/test/OptionParserTest.cc
@@ -8,7 +8,7 @@
 
 #include "OptionHandlerImpl.h"
 #include "Exception.h"
-#include "Util.h"
+#include "util.h"
 #include "Option.h"
 #include "array_fun.h"
 
diff --git a/test/PeerSessionResourceTest.cc b/test/PeerSessionResourceTest.cc
index f7a8a767..fc1078f9 100644
--- a/test/PeerSessionResourceTest.cc
+++ b/test/PeerSessionResourceTest.cc
@@ -4,7 +4,7 @@
 
 #include "MockBtMessageDispatcher.h"
 #include "Exception.h"
-#include "Util.h"
+#include "util.h"
 
 namespace aria2 {
 
diff --git a/test/ProtocolDetectorTest.cc b/test/ProtocolDetectorTest.cc
index e785bf83..7b6ccd99 100644
--- a/test/ProtocolDetectorTest.cc
+++ b/test/ProtocolDetectorTest.cc
@@ -1,6 +1,6 @@
 #include "ProtocolDetector.h"
 #include "Exception.h"
-#include "Util.h"
+#include "util.h"
 #include <iostream>
 #include <cppunit/extensions/HelperMacros.h>
 
diff --git a/test/ServerStatManTest.cc b/test/ServerStatManTest.cc
index 265c04e1..8aa9f627 100644
--- a/test/ServerStatManTest.cc
+++ b/test/ServerStatManTest.cc
@@ -7,7 +7,7 @@
 
 #include "ServerStat.h"
 #include "Exception.h"
-#include "Util.h"
+#include "util.h"
 
 namespace aria2 {
 
diff --git a/test/ServerStatTest.cc b/test/ServerStatTest.cc
index 92903c7b..af9cd0ab 100644
--- a/test/ServerStatTest.cc
+++ b/test/ServerStatTest.cc
@@ -6,7 +6,7 @@
 #include <cppunit/extensions/HelperMacros.h>
 
 #include "Exception.h"
-#include "Util.h"
+#include "util.h"
 
 namespace aria2 {
 
diff --git a/test/Sqlite3MozCookieParserTest.cc b/test/Sqlite3MozCookieParserTest.cc
index b0d528c2..ff685c64 100644
--- a/test/Sqlite3MozCookieParserTest.cc
+++ b/test/Sqlite3MozCookieParserTest.cc
@@ -5,7 +5,7 @@
 #include <cppunit/extensions/HelperMacros.h>
 
 #include "RecoverableException.h"
-#include "Util.h"
+#include "util.h"
 
 namespace aria2 {
 
diff --git a/test/StringFormatTest.cc b/test/StringFormatTest.cc
index 8e7e36be..528d00b2 100644
--- a/test/StringFormatTest.cc
+++ b/test/StringFormatTest.cc
@@ -1,6 +1,6 @@
 #include "StringFormat.h"
 #include "Exception.h"
-#include "Util.h"
+#include "util.h"
 #include <iostream>
 #include <cppunit/extensions/HelperMacros.h>
 
diff --git a/test/TimeSeedCriteriaTest.cc b/test/TimeSeedCriteriaTest.cc
index 1653f6f6..216dce71 100644
--- a/test/TimeSeedCriteriaTest.cc
+++ b/test/TimeSeedCriteriaTest.cc
@@ -2,7 +2,7 @@
 
 #include <cppunit/extensions/HelperMacros.h>
 
-#include "Util.h"
+#include "util.h"
 
 namespace aria2 {
 
diff --git a/test/TimeTest.cc b/test/TimeTest.cc
index b51e7ce5..b6a0d5c4 100644
--- a/test/TimeTest.cc
+++ b/test/TimeTest.cc
@@ -5,7 +5,7 @@
 #include <cppunit/extensions/HelperMacros.h>
 
 #include "Exception.h"
-#include "Util.h"
+#include "util.h"
 
 namespace aria2 {
 
diff --git a/test/UTPexExtensionMessageTest.cc b/test/UTPexExtensionMessageTest.cc
index e4085bd0..b6653035 100644
--- a/test/UTPexExtensionMessageTest.cc
+++ b/test/UTPexExtensionMessageTest.cc
@@ -6,7 +6,7 @@
 
 #include "Peer.h"
 #include "a2netcompat.h"
-#include "Util.h"
+#include "util.h"
 #include "bittorrent_helper.h"
 #include "MockPeerStorage.h"
 #include "Exception.h"
diff --git a/test/UriListParserTest.cc b/test/UriListParserTest.cc
index 4ad0f16e..d996172b 100644
--- a/test/UriListParserTest.cc
+++ b/test/UriListParserTest.cc
@@ -9,7 +9,7 @@
 #include <cppunit/extensions/HelperMacros.h>
 
 #include "Exception.h"
-#include "Util.h"
+#include "util.h"
 #include "prefs.h"
 #include "OptionHandler.h"
 
diff --git a/test/UtilTest.cc b/test/UtilTest.cc
index d0e1eede..b27e6181 100644
--- a/test/UtilTest.cc
+++ b/test/UtilTest.cc
@@ -1,4 +1,4 @@
-#include "Util.h"
+#include "util.h"
 
 #include <cstring>
 #include <string>
diff --git a/test/XORCloserTest.cc b/test/XORCloserTest.cc
index 6da4bccf..08e905e3 100644
--- a/test/XORCloserTest.cc
+++ b/test/XORCloserTest.cc
@@ -1,6 +1,6 @@
 #include "XORCloser.h"
 #include "Exception.h"
-#include "Util.h"
+#include "util.h"
 #include "DHTNodeLookupEntry.h"
 #include "DHTNode.h"
 #include <cstring>