mirror of https://github.com/aria2/aria2
114 lines
3.1 KiB
C++
114 lines
3.1 KiB
C++
/* <!-- copyright */
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/*
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* aria2 - The high speed download utility
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*
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* Copyright (C) 2006 Tatsuhiro Tsujikawa
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* In addition, as a special exception, the copyright holders give
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* permission to link the code of portions of this program with the
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* OpenSSL library under certain conditions as described in each
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* individual source file, and distribute linked combinations
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* including the two.
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* You must obey the GNU General Public License in all respects
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* for all of the code used other than OpenSSL. If you modify
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* file(s) with this exception, you may extend this exception to your
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* version of the file(s), but you are not obligated to do so. If you
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* do not wish to do so, delete this exception statement from your
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* version. If you delete this exception statement from all source
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* files in the program, then also delete it here.
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*/
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/* copyright --> */
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#include "GZipDecoder.h"
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#include "fmt.h"
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#include "DlAbortEx.h"
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namespace aria2 {
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const std::string GZipDecoder::NAME("GZipDecoder");
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GZipDecoder::GZipDecoder() : strm_(nullptr), finished_(false) {}
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GZipDecoder::~GZipDecoder() { release(); }
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void GZipDecoder::init()
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{
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finished_ = false;
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release();
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strm_ = new z_stream();
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strm_->zalloc = Z_NULL;
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strm_->zfree = Z_NULL;
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strm_->opaque = Z_NULL;
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strm_->avail_in = 0;
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strm_->next_in = Z_NULL;
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// initialize z_stream with gzip/zlib format auto detection enabled.
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if (Z_OK != inflateInit2(strm_, 47)) {
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throw DL_ABORT_EX("Initializing z_stream failed.");
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}
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}
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void GZipDecoder::release()
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{
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if (strm_) {
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inflateEnd(strm_);
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delete strm_;
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strm_ = nullptr;
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}
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}
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std::string GZipDecoder::decode(const unsigned char* in, size_t length)
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{
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std::string out;
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if (length == 0) {
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return out;
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}
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strm_->avail_in = length;
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strm_->next_in = const_cast<unsigned char*>(in);
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unsigned char outbuf[OUTBUF_LENGTH];
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while (1) {
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strm_->avail_out = OUTBUF_LENGTH;
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strm_->next_out = outbuf;
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int ret = ::inflate(strm_, Z_NO_FLUSH);
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if (ret == Z_STREAM_END) {
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finished_ = true;
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}
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else if (ret != Z_OK) {
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throw DL_ABORT_EX(fmt("libz::inflate() failed. cause:%s", strm_->msg));
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}
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size_t produced = OUTBUF_LENGTH - strm_->avail_out;
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out.append(&outbuf[0], &outbuf[produced]);
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if (strm_->avail_out > 0) {
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break;
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}
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}
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return out;
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}
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bool GZipDecoder::finished() { return finished_; }
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const std::string& GZipDecoder::getName() const { return NAME; }
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} // namespace aria2
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