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/* inflatestream.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/inflatestream.h"
#include <cxxtools/log.h>
#include <cxxtools/dynbuffer.h>
#include <sstream>
log_define("tntnet.inflatestream")
namespace tnt
{
namespace
{
void checkError(int ret, z_stream& stream)
{
if (ret != Z_OK)
{
log_error("InflateError " << ret << ": \"" << (stream.msg ? stream.msg : "") << '"');
std::ostringstream msg;
msg << "inflate-error " << ret;
if (stream.msg)
msg << ": " << stream.msg;
throw InflateError(ret, msg.str());
}
}
}
InflateStreamBuf::InflateStreamBuf(std::streambuf* sink_, unsigned bufsize_)
: obuffer(new char_type[bufsize_]),
bufsize(bufsize_),
sink(sink_)
{
stream.zalloc = Z_NULL;
stream.zfree = Z_NULL;
stream.opaque = 0;
stream.total_out = 0;
stream.total_in = 0;
checkError(::inflateInit(&stream), stream);
setp(obuffer, obuffer + bufsize);
}
InflateStreamBuf::~InflateStreamBuf()
{
::inflateEnd(&stream);
delete obuffer;
}
InflateStreamBuf::int_type InflateStreamBuf::overflow(int_type c)
{
log_debug("InflateStreamBuf::overflow");
// initialize input-stream for
stream.next_in = (Bytef*)obuffer;
stream.avail_in = pptr() - pbase();
do
{
// initialize zbuffer
cxxtools::Dynbuffer<Bytef> zbuffer(bufsize);
stream.next_out = zbuffer.data();
stream.avail_out = bufsize;
log_debug("pre:avail_out=" << stream.avail_out << " avail_in=" << stream.avail_in);
checkError(::inflate(&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 = bufsize - stream.avail_out;
std::streamsize n = sink->sputn(reinterpret_cast<char*>(zbuffer.data()), count);
if (n < count)
return traits_type::eof();
} while (stream.avail_in > 0);
// reset outbuffer
setp(obuffer, obuffer + bufsize);
if (c != traits_type::eof())
sputc(traits_type::to_char_type(c));
return 0;
}
InflateStreamBuf::int_type InflateStreamBuf::underflow()
{
return traits_type::eof();
}
int InflateStreamBuf::sync()
{
if (overflow(traits_type::eof()) == traits_type::eof())
return -1;
return 0;
}
}
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