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/* <!-- 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 "fmt.h"
#include "DlAbortEx.h"
namespace aria2 {
const std::string GZipDecoder::NAME("GZipDecoder");
GZipDecoder::GZipDecoder() : strm_(nullptr), finished_(false) {}
GZipDecoder::~GZipDecoder() { release(); }
void GZipDecoder::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;
// initialize z_stream with gzip/zlib format auto detection enabled.
if (Z_OK != inflateInit2(strm_, 47)) {
throw DL_ABORT_EX("Initializing z_stream failed.");
}
}
void GZipDecoder::release()
{
if (strm_) {
inflateEnd(strm_);
delete strm_;
strm_ = nullptr;
}
}
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 DL_ABORT_EX(fmt("libz::inflate() failed. cause:%s", strm_->msg));
}
size_t produced = OUTBUF_LENGTH - strm_->avail_out;
out.append(&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
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