poco/Foundation/src/DeflatingStream.cpp

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//
// DeflatingStream.cpp
//
// $Id: //poco/Main/Foundation/src/DeflatingStream.cpp#14 $
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//
// Library: Foundation
// Package: Streams
// Module: ZLibStream
//
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// Permission is hereby granted, free of charge, to any person or organization
// obtaining a copy of the software and accompanying documentation covered by
// this license (the "Software") to use, reproduce, display, distribute,
// execute, and transmit the Software, and to prepare derivative works of the
// Software, and to permit third-parties to whom the Software is furnished to
// do so, all subject to the following:
//
// The copyright notices in the Software and this entire statement, including
// the above license grant, this restriction and the following disclaimer,
// must be included in all copies of the Software, in whole or in part, and
// all derivative works of the Software, unless such copies or derivative
// works are solely in the form of machine-executable object code generated by
// a source language processor.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//
#include "Poco/DeflatingStream.h"
#include "Poco/Exception.h"
namespace Poco {
DeflatingStreamBuf::DeflatingStreamBuf(std::istream& istr, StreamType type, int level):
BufferedStreamBuf(STREAM_BUFFER_SIZE, std::ios::in),
_pIstr(&istr),
_pOstr(0),
_eof(false)
{
_zstr.zalloc = Z_NULL;
_zstr.zfree = Z_NULL;
_zstr.opaque = Z_NULL;
_zstr.next_in = 0;
_zstr.avail_in = 0;
_zstr.next_out = 0;
_zstr.avail_out = 0;
int rc = deflateInit2(&_zstr, level, Z_DEFLATED, 15 + (type == STREAM_GZIP ? 16 : 0), 8, Z_DEFAULT_STRATEGY);
if (rc != Z_OK) throw IOException(zError(rc));
_buffer = new char[DEFLATE_BUFFER_SIZE];
}
DeflatingStreamBuf::DeflatingStreamBuf(std::ostream& ostr, StreamType type, int level):
BufferedStreamBuf(STREAM_BUFFER_SIZE, std::ios::out),
_pIstr(0),
_pOstr(&ostr),
_eof(false)
{
_zstr.zalloc = Z_NULL;
_zstr.zfree = Z_NULL;
_zstr.opaque = Z_NULL;
_zstr.next_in = 0;
_zstr.avail_in = 0;
_zstr.next_out = 0;
_zstr.avail_out = 0;
int rc = deflateInit2(&_zstr, level, Z_DEFLATED, 15 + (type == STREAM_GZIP ? 16 : 0), 8, Z_DEFAULT_STRATEGY);
if (rc != Z_OK) throw IOException(zError(rc));
_buffer = new char[DEFLATE_BUFFER_SIZE];
}
DeflatingStreamBuf::~DeflatingStreamBuf()
{
try
{
close();
}
catch (...)
{
}
delete [] _buffer;
}
int DeflatingStreamBuf::close()
{
sync();
if (_pIstr)
{
int rc = deflateEnd(&_zstr);
if (rc != Z_OK) throw IOException(zError(rc));
_pIstr = 0;
}
else if (_pOstr)
{
if (_zstr.next_out)
{
int rc = deflate(&_zstr, Z_FINISH);
if (rc != Z_OK && rc != Z_STREAM_END) throw IOException(zError(rc));
_pOstr->write(_buffer, DEFLATE_BUFFER_SIZE - _zstr.avail_out);
if (!_pOstr->good()) throw IOException(zError(rc));
_zstr.next_out = (unsigned char*) _buffer;
_zstr.avail_out = DEFLATE_BUFFER_SIZE;
while (rc != Z_STREAM_END)
{
rc = deflate(&_zstr, Z_FINISH);
if (rc != Z_OK && rc != Z_STREAM_END) throw IOException(zError(rc));
_pOstr->write(_buffer, DEFLATE_BUFFER_SIZE - _zstr.avail_out);
if (!_pOstr->good()) throw IOException(zError(rc));
_zstr.next_out = (unsigned char*) _buffer;
_zstr.avail_out = DEFLATE_BUFFER_SIZE;
}
rc = deflateEnd(&_zstr);
if (rc != Z_OK) throw IOException(zError(rc));
}
_pOstr = 0;
}
return 0;
}
int DeflatingStreamBuf::readFromDevice(char* buffer, std::streamsize length)
{
if (!_pIstr) return 0;
if (_zstr.avail_in == 0 && !_eof)
{
int n = 0;
if (_pIstr->good())
{
_pIstr->read(_buffer, DEFLATE_BUFFER_SIZE);
n = static_cast<int>(_pIstr->gcount());
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}
if (n > 0)
{
_zstr.next_in = (unsigned char*) _buffer;
_zstr.avail_in = n;
}
else
{
_zstr.next_in = 0;
_zstr.avail_in = 0;
_eof = true;
}
}
_zstr.next_out = (unsigned char*) buffer;
_zstr.avail_out = static_cast<unsigned>(length);
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for (;;)
{
int rc = deflate(&_zstr, _eof ? Z_FINISH : Z_NO_FLUSH);
if (_eof && rc == Z_STREAM_END)
{
rc = deflateEnd(&_zstr);
if (rc != Z_OK) throw IOException(zError(rc));
_pIstr = 0;
return static_cast<int>(length) - _zstr.avail_out;
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}
if (rc != Z_OK) throw IOException(zError(rc));
if (_zstr.avail_out == 0)
{
return static_cast<int>(length);
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}
if (_zstr.avail_in == 0)
{
int n = 0;
if (_pIstr->good())
{
_pIstr->read(_buffer, DEFLATE_BUFFER_SIZE);
n = static_cast<int>(_pIstr->gcount());
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}
if (n > 0)
{
_zstr.next_in = (unsigned char*) _buffer;
_zstr.avail_in = n;
}
else
{
_zstr.next_in = 0;
_zstr.avail_in = 0;
_eof = true;
}
}
}
}
int DeflatingStreamBuf::writeToDevice(const char* buffer, std::streamsize length)
{
if (length == 0 || !_pOstr) return 0;
_zstr.next_in = (unsigned char*) buffer;
_zstr.avail_in = static_cast<unsigned>(length);
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_zstr.next_out = (unsigned char*) _buffer;
_zstr.avail_out = DEFLATE_BUFFER_SIZE;
for (;;)
{
int rc = deflate(&_zstr, Z_NO_FLUSH);
if (rc != Z_OK) throw IOException(zError(rc));
if (_zstr.avail_out == 0)
{
_pOstr->write(_buffer, DEFLATE_BUFFER_SIZE);
if (!_pOstr->good()) throw IOException(zError(rc));
_zstr.next_out = (unsigned char*) _buffer;
_zstr.avail_out = DEFLATE_BUFFER_SIZE;
}
if (_zstr.avail_in == 0)
{
_pOstr->write(_buffer, DEFLATE_BUFFER_SIZE - _zstr.avail_out);
if (!_pOstr->good()) throw IOException(zError(rc));
_zstr.next_out = (unsigned char*) _buffer;
_zstr.avail_out = DEFLATE_BUFFER_SIZE;
break;
}
}
return static_cast<int>(length);
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}
DeflatingIOS::DeflatingIOS(std::ostream& ostr, DeflatingStreamBuf::StreamType type, int level):
_buf(ostr, type, level)
{
poco_ios_init(&_buf);
}
DeflatingIOS::DeflatingIOS(std::istream& istr, DeflatingStreamBuf::StreamType type, int level):
_buf(istr, type, level)
{
poco_ios_init(&_buf);
}
DeflatingIOS::~DeflatingIOS()
{
}
DeflatingStreamBuf* DeflatingIOS::rdbuf()
{
return &_buf;
}
DeflatingOutputStream::DeflatingOutputStream(std::ostream& ostr, DeflatingStreamBuf::StreamType type, int level):
DeflatingIOS(ostr, type, level),
std::ostream(&_buf)
{
}
DeflatingOutputStream::~DeflatingOutputStream()
{
}
int DeflatingOutputStream::close()
{
return _buf.close();
}
DeflatingInputStream::DeflatingInputStream(std::istream& istr, DeflatingStreamBuf::StreamType type, int level):
DeflatingIOS(istr, type, level),
std::istream(&_buf)
{
}
DeflatingInputStream::~DeflatingInputStream()
{
}
} // namespace Poco