2008-06-29 Tatsuhiro Tsujikawa <tujikawa at rednoah dot com>

	Added gzip, deflate decoding support in HTTP using libz. If 
compiled
	with this feature, aria2 sends "Accept-Encoding: deflate, gzip" 
header
	to a HTTP server. If a server returns "Content-Encoding: gzip" 
or
	"Content-Encoding: deflate" then, aria2 decodes the response 
body on the
	fly and writes decoded data to a local disk.
	* README
	* README.html
	* configure.ac
	* m4/aria2_arg.m4: Added ARIA2_ARG_WITH and ARIA2_ARG_ENABLE, 
they are
	wrapper function for AC_ARG_WITH and AC_ARG_ENABLE respectively.
	* m4/libz.m4
	* src/Decoder.h
	* src/DownloadCommand.cc
	* src/DownloadCommand.h
	* src/Exception.h
	* src/GZipDecoder.cc
	* src/GZipDecoder.h
	* src/HttpHeader.cc
	* src/HttpHeader.h
	* src/HttpRequest.cc
	* src/HttpRequest.h
	* src/HttpResponse.cc
	* src/HttpResponse.h
	* src/HttpResponseCommand.cc
	* src/Makefile.am
	* test/GZipDecoderTest.cc
	* test/HttpRequestTest.cc
	* test/HttpResponseTest.cc
	* test/Makefile.am
	* test/Makefile.in
	* test/gzip_decode_test.gz

1 files changed, 119 insertions, 0 deletions

diff --git a/src/GZipDecoder.cc b/src/GZipDecoder.cc
new file mode 100644
index 00000000..81f46d2c
--- /dev/null
+++ b/src/GZipDecoder.cc
@@ -0,0 +1,119 @@
+/* <!-- 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 "GZipDecoder.h"
+#include "StringFormat.h"
+#include "DlAbortEx.h"
+
+namespace aria2 {
+
+const std::string GZipDecoder::NAME("GZipDecoder");
+
+GZipDecoder::GZipDecoder():_strm(0), _finished(false) {}
+
+GZipDecoder::~GZipDecoder()
+{
+  release();
+}
+
+void GZipDecoder::init()
+{
+  _strm = new z_stream();
+  _strm->zalloc = Z_NULL;
+  _strm->zfree = Z_NULL;
+  _strm->opaque = Z_NULL;
+  _strm->avail_in = 0;
+  _strm->next_in = Z_NULL;
+
+  // initalize z_stream with gzip/zlib format auto detection enabled.
+  if(Z_OK != inflateInit2(_strm, 47)) {
+    throw DlAbortEx("Initializing z_stream failed.");
+  }
+}
+
+void GZipDecoder::release()
+{
+  if(_strm) {
+    inflateEnd(_strm);
+    _strm = 0;
+  }
+}
+
+std::string GZipDecoder::decode(const unsigned char* in, size_t length)
+{
+  std::string out;
+
+  if(length == 0) {
+    return out;
+  }
+
+  _strm->avail_in = length;
+  _strm->next_in = const_cast<unsigned char*>(in);
+
+  unsigned char outbuf[OUTBUF_LENGTH];
+  while(1) {
+    _strm->avail_out = OUTBUF_LENGTH;
+    _strm->next_out = outbuf;
+
+    int ret = ::inflate(_strm, Z_NO_FLUSH);
+
+    if(ret == Z_STREAM_END) {
+      _finished = true;
+    } else if(ret != Z_OK) {
+      throw DlAbortEx(StringFormat("libz::inflate() failed. cause:%s",
+				   _strm->msg).str());
+    }
+
+    size_t produced = OUTBUF_LENGTH-_strm->avail_out;
+
+    out.insert(out.end(), &outbuf[0], &outbuf[produced]);
+
+    if(_strm->avail_out > 0) {
+      break;
+    }
+  }
+  return out;
+}
+
+bool GZipDecoder::finished()
+{
+  return _finished;
+}
+
+const std::string& GZipDecoder::getName() const
+{
+  return NAME;
+}
+
+} // namespace aria2