2007-08-08 Tatsuhiro Tsujikawa <tujikawa at rednoah dot com>

	MessageDigestHelper is introduced in order to simplify the use
	of message digest. Removed repeated code.
	The message digest algorithm is now specified by string, like 
"sha1",
	"md5".
	* src/messageDigest.{h, cc}
	* src/MessageDigestHelper.{h, cc}: New class.
	* src/DefaultPieceStorage.cc
	* src/DefaultBtContext.{h, cc}
	(computeFastSet): New function.
	(setInfoHash): Added for unit testing.
	(setNumPieces): Added for unit testing.
	* src/DefaultBtInteractive.cc
	* src/BtPieceMessage.cc
	* src/Peer.cc
	* src/Checksum.h
	* src/message.h
	* src/IteratableChecksumValidator.h
	* src/ChunkChecksumValidator.{h, cc}: Use 
IteratableChecksumValidator
	inside it.
	* src/SegmentMan.{h, cc}
	(checkIntegrity): Removed.
	* src/IteratableChunkChecksumValidator.{h, cc}
	* src/Util.h
	(sha1Sum): Removed.
	(simpleMessageDigest): Removed.
	(fileChecksum): Removed.
	(computeFastSet): Removed.
	* src/ShaVisitor.cc
	* src/ChunkChecksum.h
	* src/DownloadCommand.cc

	Removed messageDigest virtual functions.
	* src/MultiDiskAdaptor.{h, cc}
	* src/DiskAdaptor.h
	* src/ByteArrayDiskWriter.h
	* src/DiskWriter.h
	* src/DiskAdaptorWriter.h
	* src/AbstractSingleDiskAdaptor.{h, cc}
	* src/AbstractDiskWriter.{h, cc}
	
	Fixed comilation error when message digest is disabled.
	* src/MetalinkEntry.{h, cc}
	* src/MetalinkRequestInfo.cc
	
	Removed srandom and random.
	* src/SimpleRandomizer.h

	Added size() virtual function to DiskAdaptor
	* src/MultiDiskAdaptor.h

	Fixed the bug that causes that files are not opened correctly in
	multi-file torrent.
	* src/TorrentRequestInfo.cc
	* src/MultiDiskAdaptor.cc
	
	Added SHA256 support
	* src/messageDigest.cc
	* src/Xml2MetalinkProcessor.cc

	Show supported message digest algorithms
	* src/main.cc

	Updated contact info.
	* src/main.cc

1 files changed, 77 insertions, 0 deletions

diff --git a/src/MessageDigestHelper.h b/src/MessageDigestHelper.h
new file mode 100644
index 00000000..21e4a215
--- /dev/null
+++ b/src/MessageDigestHelper.h
@@ -0,0 +1,77 @@
+/* <!-- copyright */
+/*
+ * aria2 - The high speed download utility
+ *
+ * Copyright (C) 2006 Tatsuhiro Tsujikawa
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * In addition, as a special exception, the copyright holders give
+ * permission to link the code of portions of this program with the
+ * OpenSSL library under certain conditions as described in each
+ * individual source file, and distribute linked combinations
+ * including the two.
+ * You must obey the GNU General Public License in all respects
+ * for all of the code used other than OpenSSL.  If you modify
+ * file(s) with this exception, you may extend this exception to your
+ * version of the file(s), but you are not obligated to do so.  If you
+ * do not wish to do so, delete this exception statement from your
+ * version.  If you delete this exception statement from all source
+ * files in the program, then also delete it here.
+ */
+/* copyright --> */
+#ifndef _D_MESSAGE_DIGEST_HELPER_H_
+#define _D_MESSAGE_DIGEST_HELPER_H_
+
+#include "common.h"
+#include "DiskWriter.h"
+
+class MessageDigestHelper {
+public:
+  /**
+   * Returns message digest in hexadecimal notation.
+   * Digest algorithm is specified by algo.
+   */
+  static string digest(const string& algo, DiskWriterHandle diskWriter, int64_t offset, int64_t length);
+
+  /**
+   * Calculates message digest of file opened by diskWriter.
+   */
+  static string digest(const string& algo, DiskWriterHandle diskWriter)
+  {
+    return digest(algo, diskWriter, 0, diskWriter->size());
+  }
+
+  /**
+   * Calculates message digest of file denoted by filename.
+   */
+  static string digest(const string& algo, const string& filename);
+
+  static string digest(const string& algo, const void* data, int32_t length);
+
+  static string digestString(const string& algo, const string& data)
+  {
+    return digest(algo, data.c_str(), data.size());
+  }
+
+  /**
+   * Stores *raw* message digest into md.
+   * Throws exception when mdLength is less than the size of message digest.
+   */
+  static void digest(unsigned char* md, int32_t mdLength,
+		     const string& algo, const void* data, int32_t length);
+};
+
+#endif // _D_MESSAGE_DIGEST_HELPER_H_