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/* <!-- 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 "GZipEncoder.h"
#include <cstring>
#include "fmt.h"
#include "DlAbortEx.h"
#include "util.h"
namespace aria2 {
namespace {
const int OUTBUF_LENGTH = 4096;
} // namespace
GZipEncoder::GZipEncoder():strm_(0), finished_(false) {}
GZipEncoder::~GZipEncoder()
{
release();
}
void GZipEncoder::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;
if(Z_OK != deflateInit2
(strm_, Z_DEFAULT_COMPRESSION, Z_DEFLATED, 31, 9, Z_DEFAULT_STRATEGY)) {
throw DL_ABORT_EX("Initializing z_stream failed.");
}
}
void GZipEncoder::release()
{
if(strm_) {
deflateEnd(strm_);
delete strm_;
strm_ = 0;
}
}
std::string GZipEncoder::encode
(const unsigned char* in, size_t length, int flush)
{
std::string 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 = ::deflate(strm_, flush);
if(ret == Z_STREAM_END) {
finished_ = true;
} else if(ret != Z_OK) {
throw DL_ABORT_EX(fmt("libz::deflate() 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 GZipEncoder::finished()
{
return finished_;
}
std::string GZipEncoder::str()
{
internalBuf_ += encode(0, 0, Z_FINISH);
return internalBuf_;
}
GZipEncoder& GZipEncoder::operator<<(const char* s)
{
internalBuf_ += encode(reinterpret_cast<const unsigned char*>(s), strlen(s));
return *this;
}
GZipEncoder& GZipEncoder::operator<<(const std::string& s)
{
internalBuf_ += encode
(reinterpret_cast<const unsigned char*>(s.data()), s.size());
return *this;
}
GZipEncoder& GZipEncoder::operator<<(int64_t i)
{
std::string s = util::itos(i);
(*this) << s;
return *this;
}
} // namespace aria2
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