1 files changed, 131 insertions, 0 deletions
diff --git a/src/GZipDecodingStreamFilter.cc b/src/GZipDecodingStreamFilter.cc
new file mode 100644
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--- /dev/null
+++ b/src/GZipDecodingStreamFilter.cc
@@ -0,0 +1,131 @@
+/* <!-- copyright */
+/*
+ * aria2 - The high speed download utility
+ *
+ * Copyright (C) 2010 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 "GZipDecodingStreamFilter.h"
+
+#include <cassert>
+
+#include "StringFormat.h"
+#include "DlAbortEx.h"
+
+namespace aria2 {
+
+const std::string GZipDecodingStreamFilter::NAME("GZipDecodingStreamFilter");
+
+GZipDecodingStreamFilter::GZipDecodingStreamFilter
+(const SharedHandle<StreamFilter>& delegate):
+  StreamFilter(delegate), strm_(0), finished_(false), bytesProcessed_(0) {}
+
+GZipDecodingStreamFilter::~GZipDecodingStreamFilter()
+{
+  release();
+}
+
+void GZipDecodingStreamFilter::init()
+{
+  finished_ = false;
+  release();
+  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 DL_ABORT_EX("Initializing z_stream failed.");
+  }
+}
+
+void GZipDecodingStreamFilter::release()
+{
+  if(strm_) {
+    inflateEnd(strm_);
+    delete strm_;
+    strm_ = 0;
+  }
+}
+
+ssize_t GZipDecodingStreamFilter::transform
+(const SharedHandle<BinaryStream>& out,
+ const SharedHandle<Segment>& segment,
+ const unsigned char* inbuf, size_t inlen)
+{
+  bytesProcessed_ = 0;
+  ssize_t outlen = 0;
+  if(inlen == 0) {
+    return outlen;
+  }
+
+  strm_->avail_in = inlen;
+  strm_->next_in = const_cast<unsigned char*>(inbuf);
+
+  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 DL_ABORT_EX(StringFormat("libz::inflate() failed. cause:%s",
+                                     strm_->msg).str());
+    }
+
+    size_t produced = OUTBUF_LENGTH-strm_->avail_out;
+
+    outlen += getDelegate()->transform(out, segment, outbuf, produced);
+    if(strm_->avail_out > 0) {
+      break;
+    }
+  }
+  assert(inlen >= strm_->avail_in);
+  bytesProcessed_ = inlen-strm_->avail_in;
+  return outlen;
+}
+
+bool GZipDecodingStreamFilter::finished()
+{
+  return finished_ && getDelegate()->finished();
+}
+
+const std::string& GZipDecodingStreamFilter::getName() const
+{
+  return NAME;
+}
+
+} // namespace aria2