1 files changed, 101 insertions, 0 deletions
diff --git a/src/MessageDigestHelper.cc b/src/MessageDigestHelper.cc
new file mode 100644
index 00000000..8819dcdc
--- /dev/null
+++ b/src/MessageDigestHelper.cc
@@ -0,0 +1,101 @@
+/* <!-- 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 --> */
+#include "MessageDigestHelper.h"
+#include "messageDigest.h"
+#include "DlAbortEx.h"
+#include "message.h"
+#include "DefaultDiskWriter.h"
+#include "Util.h"
+#include <errno.h>
+
+string MessageDigestHelper::digest(const string& algo, DiskWriterHandle diskWriter, int64_t offset, int64_t length)
+{
+  MessageDigestContext ctx;
+  ctx.trySetAlgo(algo);
+  ctx.digestInit();
+
+  int32_t BUFSIZE = 4096;
+  char BUF[BUFSIZE];
+  int64_t iteration = length/BUFSIZE;
+  int32_t tail = length%BUFSIZE;
+  for(int64_t i = 0; i < iteration; ++i) {
+    int32_t readLength = diskWriter->readData(BUF, BUFSIZE, offset);
+    if(readLength != BUFSIZE) {
+      throw new DlAbortEx(EX_FILE_READ, "n/a", strerror(errno));
+    }
+    ctx.digestUpdate(BUF, readLength);
+    offset += readLength;
+  }
+  if(tail) {
+    int32_t readLength = diskWriter->readData(BUF, tail, offset);
+    if(readLength != tail) {
+      throw new DlAbortEx(EX_FILE_READ, "n/a", strerror(errno));
+    }
+    ctx.digestUpdate(BUF, readLength);
+  }
+  string rawMD = ctx.digestFinal();
+  return Util::toHex((const unsigned char*)rawMD.c_str(), rawMD.size());
+}
+
+string MessageDigestHelper::digest(const string& algo, const string& filename)
+{
+  DiskWriterHandle writer = new DefaultDiskWriter();
+  writer->openExistingFile(filename);
+  return digest(algo, writer);
+}
+
+string MessageDigestHelper::digest(const string& algo, const void* data, int32_t length)
+{
+  MessageDigestContext ctx;
+  ctx.trySetAlgo(algo);
+  ctx.digestInit();
+  ctx.digestUpdate(data, length);
+  string rawMD = ctx.digestFinal();
+  return Util::toHex((const unsigned char*)rawMD.c_str(), rawMD.size());
+}
+
+void MessageDigestHelper::digest(unsigned char* md, int32_t mdLength,
+				 const string& algo, const void* data, int32_t length)
+{
+  if(mdLength < MessageDigestContext::digestLength(algo)) {
+    throw new DlAbortEx("Insufficient space for storing message digest: %d required, but only %d is allocated", MessageDigestContext::digestLength(algo), mdLength);
+  }
+  MessageDigestContext ctx;
+  ctx.trySetAlgo(algo);
+  ctx.digestInit();
+  ctx.digestUpdate(data, length);
+  ctx.digestFinal(md);
+}
+