mirror of https://github.com/aria2/aria2
138 lines
3.6 KiB
C++
138 lines
3.6 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) 2010 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 "GZipEncoder.h"
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#include <cstring>
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#include "fmt.h"
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#include "DlAbortEx.h"
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#include "util.h"
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namespace aria2 {
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namespace {
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const int OUTBUF_LENGTH = 4096;
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} // namespace
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GZipEncoder::GZipEncoder():strm_(0) {}
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GZipEncoder::~GZipEncoder()
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{
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release();
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}
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void GZipEncoder::init()
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{
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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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if(Z_OK != deflateInit2
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(strm_, Z_DEFAULT_COMPRESSION, Z_DEFLATED, 31, 9, Z_DEFAULT_STRATEGY)) {
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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 GZipEncoder::release()
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{
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if(strm_) {
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deflateEnd(strm_);
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delete strm_;
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strm_ = 0;
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}
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}
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std::string GZipEncoder::encode
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(const unsigned char* in, size_t length, int flush)
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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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std::string out;
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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 = ::deflate(strm_, flush);
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if(ret == Z_STREAM_ERROR) {
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throw DL_ABORT_EX(fmt("libz::deflate() failed. cause:%s",
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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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std::string GZipEncoder::str()
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{
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internalBuf_ += encode(0, 0, Z_FINISH);
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return internalBuf_;
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}
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GZipEncoder& GZipEncoder::operator<<(const char* s)
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{
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internalBuf_ += encode(reinterpret_cast<const unsigned char*>(s), strlen(s));
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return *this;
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}
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GZipEncoder& GZipEncoder::operator<<(const std::string& s)
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{
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internalBuf_ += encode
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(reinterpret_cast<const unsigned char*>(s.data()), s.size());
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return *this;
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}
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GZipEncoder& GZipEncoder::operator<<(int64_t i)
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{
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std::string s = util::itos(i);
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(*this) << s;
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return *this;
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}
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GZipEncoder& GZipEncoder::write(const char* s, size_t length)
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{
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internalBuf_ += encode(reinterpret_cast<const unsigned char*>(s), length);
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return *this;
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}
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} // namespace aria2
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