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/* deflatestream.cpp
* Copyright (C) 2003-2005 Tommi Maekitalo
*
* 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
* is provided AS IS, WITHOUT ANY WARRANTY; without even the implied
* warranty of MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, and
* NON-INFRINGEMENT. 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 St, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#include "tnt/deflatestream.h"
#include <cxxtools/log.h>
#include <sstream>
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, 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;
//checkError(::deflateInit(&stream, level), stream);
int strategy = Z_DEFAULT_STRATEGY;
level = 6;
checkError(::deflateInit2(&stream, level, Z_DEFLATED, -MAX_WBITS, 8, strategy), stream);
setp(obuffer.begin(), obuffer.end());
}
DeflateStreamBuf::~DeflateStreamBuf()
{
::deflateEnd(&stream);
}
DeflateStreamBuf::int_type DeflateStreamBuf::overflow(int_type c)
{
log_debug("DeflateStreamBuf::overflow");
// initialize input-stream
stream.next_in = (Bytef*)obuffer.data();
stream.avail_in = pptr() - obuffer.data();
// initialize zbuffer for deflated data
char zbuffer[8192];
stream.next_out = (Bytef*)zbuffer;
stream.avail_out = sizeof(zbuffer);
// deflate
log_debug("pre:avail_out=" << stream.avail_out << " avail_in=" << stream.avail_in);
checkError(::deflate(&stream, Z_NO_FLUSH), stream);
log_debug("post:avail_out=" << stream.avail_out << " avail_in=" << stream.avail_in);
// 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.data(), stream.next_in, stream.avail_in);
// reset outbuffer
setp(obuffer.begin() + stream.avail_in, obuffer.end());
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()
{
log_debug("DeflateStreamBuf::sync");
// initialize input-stream for
stream.next_in = (Bytef*)obuffer.data();
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("pre:avail_out=" << stream.avail_out << " avail_in=" << stream.avail_in);
checkError(::deflate(&stream, Z_SYNC_FLUSH), stream);
log_debug("post:avail_out=" << stream.avail_out << " avail_in=" << stream.avail_in);
// 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.begin(), obuffer.end());
return 0;
}
int DeflateStreamBuf::end()
{
char zbuffer[8192];
// initialize input-stream for
stream.next_in = (Bytef*)obuffer.data();
stream.avail_in = pptr() - pbase();
while (true)
{
// initialize zbuffer
stream.next_out = (Bytef*)zbuffer;
stream.avail_out = sizeof(zbuffer);
log_debug("pre:avail_out=" << stream.avail_out << " avail_in=" << stream.avail_in);
int ret = checkError(::deflate(&stream, Z_FINISH), stream);
log_debug("post:avail_out=" << stream.avail_out << " avail_in=" << stream.avail_in);
// 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.begin(), obuffer.end());
return 0;
}
void DeflateStream::end()
{
if (streambuf.end() != 0)
setstate(failbit);
}
}
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