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/*
* Copyright (C) 2003-2005 Tommi Maekitalo
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* As a special exception, you may use this file as part of a free
* software library without restriction. Specifically, if other files
* instantiate templates or use macros or inline functions from this
* file, or you compile this file and link it with other files to
* produce an executable, this file does not by itself cause the
* resulting executable to be covered by the GNU General Public
* License. This exception does not however invalidate any other
* reasons why the executable file might be covered by the GNU Library
* General Public License.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "tnt/deflatestream.h"
#include <cxxtools/log.h>
#include <sstream>
#include <string.h>
log_define("tntnet.deflatestream")
namespace tnt
{
namespace
{
int checkError(int ret, z_stream& stream)
{
if (ret != Z_OK && ret != Z_STREAM_END)
{
log_error("DeflateError " << ret << ": \"" << (stream.msg ? stream.msg : "") << '"');
std::ostringstream msg;
msg << "deflate-error " << ret;
if (stream.msg)
msg << ": " << stream.msg;
throw DeflateError(ret, msg.str());
}
return ret;
}
}
DeflateStreamBuf::DeflateStreamBuf(std::streambuf* sink, int level, int windowBits, unsigned bufsize)
: _obuffer(bufsize),
_sink(sink)
{
memset(&_stream, 0, sizeof(z_stream));
_stream.zalloc = Z_NULL;
_stream.zfree = Z_NULL;
_stream.opaque = 0;
_stream.total_out = 0;
_stream.total_in = 0;
_stream.next_in = Z_NULL;
_stream.next_out = Z_NULL;
_stream.avail_in = 0;
_stream.avail_out = 0;
int strategy = Z_DEFAULT_STRATEGY;
log_debug("deflateInit2(" << static_cast<const void*>(&_stream) << ')');
checkError(::deflateInit2(&_stream, level, Z_DEFLATED, windowBits, 8, strategy), _stream);
setp(&_obuffer[0], &_obuffer[0] + _obuffer.size());
}
DeflateStreamBuf::~DeflateStreamBuf()
{
log_debug("deflateEnd(" << static_cast<const void*>(&_stream) << ')');
::deflateEnd(&_stream);
}
DeflateStreamBuf::int_type DeflateStreamBuf::overflow(int_type c)
{
// initialize input-stream
_stream.next_in = reinterpret_cast<Bytef*>(&_obuffer[0]);
_stream.avail_in = pptr() - &_obuffer[0];
// initialize zbuffer for deflated data
char zbuffer[8192];
_stream.next_out = reinterpret_cast<Bytef*>(zbuffer);
_stream.avail_out = sizeof(zbuffer);
// deflate
log_debug("deflate(" << static_cast<const void*>(&_stream) << ", Z_NO_FLUSH)");
checkError(::deflate(&_stream, Z_NO_FLUSH), _stream);
// copy zbuffer to sink / consume deflated data
std::streamsize count = sizeof(zbuffer) - _stream.avail_out;
if (count > 0)
{
std::streamsize n = _sink->sputn(zbuffer, count);
if (n < count)
return traits_type::eof();
}
// move remaining characters to start of obuffer
if (_stream.avail_in > 0)
memmove(&_obuffer[0], _stream.next_in, _stream.avail_in);
// reset outbuffer
setp(&_obuffer[0] + _stream.avail_in, &_obuffer[0] + _obuffer.size());
if (c != traits_type::eof())
sputc(traits_type::to_char_type(c));
return 0;
}
DeflateStreamBuf::int_type DeflateStreamBuf::underflow()
{
return traits_type::eof();
}
int DeflateStreamBuf::sync()
{
// initialize input-stream for
_stream.next_in = reinterpret_cast<Bytef*>(&_obuffer[0]);
_stream.avail_in = pptr() - pbase();
char zbuffer[8192];
while (_stream.avail_in > 0)
{
// initialize zbuffer
_stream.next_out = (Bytef*)zbuffer;
_stream.avail_out = sizeof(zbuffer);
log_debug("deflate(" << static_cast<const void*>(&_stream) << ", Z_SYNC_FLUSH)");
checkError(::deflate(&_stream, Z_SYNC_FLUSH), _stream);
// copy zbuffer to sink
std::streamsize count = sizeof(zbuffer) - _stream.avail_out;
if (count > 0)
{
std::streamsize n = _sink->sputn(zbuffer, count);
if (n < count)
return -1;
}
};
// reset outbuffer
setp(&_obuffer[0], &_obuffer[0] + _obuffer.size());
return 0;
}
int DeflateStreamBuf::end()
{
char zbuffer[8192];
// initialize input-stream for
_stream.next_in = reinterpret_cast<Bytef*>(&_obuffer[0]);
_stream.avail_in = pptr() - pbase();
while (true)
{
// initialize zbuffer
_stream.next_out = (Bytef*)zbuffer;
_stream.avail_out = sizeof(zbuffer);
log_debug("deflate(" << static_cast<const void*>(&_stream) << ", Z_FINISH)");
int ret = checkError(::deflate(&_stream, Z_FINISH), _stream);
// copy zbuffer to sink
std::streamsize count = sizeof(zbuffer) - _stream.avail_out;
if (count > 0)
{
std::streamsize n = _sink->sputn(zbuffer, count);
if (n < count)
return -1;
}
if (ret == Z_STREAM_END)
break;
};
// reset outbuffer
setp(&_obuffer[0], &_obuffer[0] + _obuffer.size());
return 0;
}
void DeflateStreamBuf::reinitialize()
{
log_debug("deflateReset(" << static_cast<const void*>(&_stream) << ')');
checkError(::deflateReset(&_stream), _stream);
}
void DeflateStream::end()
{
if (_streambuf.end() != 0)
setstate(failbit);
}
}
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