mirror of
https://github.com/pocoproject/poco.git
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400 lines
10 KiB
C++
400 lines
10 KiB
C++
//
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// DeflatingStream.cpp
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//
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// $Id: //poco/1.4/Foundation/src/DeflatingStream.cpp#1 $
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//
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// Library: Foundation
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// Package: Streams
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// Module: ZLibStream
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//
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// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
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// and Contributors.
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//
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// Permission is hereby granted, free of charge, to any person or organization
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// obtaining a copy of the software and accompanying documentation covered by
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// this license (the "Software") to use, reproduce, display, distribute,
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// execute, and transmit the Software, and to prepare derivative works of the
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// Software, and to permit third-parties to whom the Software is furnished to
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// do so, all subject to the following:
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//
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// The copyright notices in the Software and this entire statement, including
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// the above license grant, this restriction and the following disclaimer,
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// must be included in all copies of the Software, in whole or in part, and
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// all derivative works of the Software, unless such copies or derivative
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// works are solely in the form of machine-executable object code generated by
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// a source language processor.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
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// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
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// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
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// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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//
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#include "Poco/DeflatingStream.h"
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#include "Poco/Exception.h"
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namespace Poco {
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DeflatingStreamBuf::DeflatingStreamBuf(std::istream& istr, StreamType type, int level):
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BufferedStreamBuf(STREAM_BUFFER_SIZE, std::ios::in),
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_pIstr(&istr),
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_pOstr(0),
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_eof(false)
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{
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_zstr.zalloc = Z_NULL;
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_zstr.zfree = Z_NULL;
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_zstr.opaque = Z_NULL;
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_zstr.next_in = 0;
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_zstr.avail_in = 0;
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_zstr.next_out = 0;
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_zstr.avail_out = 0;
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_buffer = new char[DEFLATE_BUFFER_SIZE];
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int rc = deflateInit2(&_zstr, level, Z_DEFLATED, 15 + (type == STREAM_GZIP ? 16 : 0), 8, Z_DEFAULT_STRATEGY);
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if (rc != Z_OK)
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{
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delete [] _buffer;
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throw IOException(zError(rc));
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}
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}
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DeflatingStreamBuf::DeflatingStreamBuf(std::istream& istr, int windowBits, int level):
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BufferedStreamBuf(STREAM_BUFFER_SIZE, std::ios::in),
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_pIstr(&istr),
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_pOstr(0),
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_eof(false)
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{
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_zstr.zalloc = Z_NULL;
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_zstr.zfree = Z_NULL;
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_zstr.opaque = Z_NULL;
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_zstr.next_in = 0;
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_zstr.avail_in = 0;
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_zstr.next_out = 0;
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_zstr.avail_out = 0;
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_buffer = new char[DEFLATE_BUFFER_SIZE];
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int rc = deflateInit2(&_zstr, level, Z_DEFLATED, windowBits, 8, Z_DEFAULT_STRATEGY);
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if (rc != Z_OK)
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{
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delete [] _buffer;
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throw IOException(zError(rc));
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}
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}
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DeflatingStreamBuf::DeflatingStreamBuf(std::ostream& ostr, StreamType type, int level):
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BufferedStreamBuf(STREAM_BUFFER_SIZE, std::ios::out),
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_pIstr(0),
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_pOstr(&ostr),
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_eof(false)
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{
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_zstr.zalloc = Z_NULL;
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_zstr.zfree = Z_NULL;
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_zstr.opaque = Z_NULL;
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_zstr.next_in = 0;
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_zstr.avail_in = 0;
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_zstr.next_out = 0;
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_zstr.avail_out = 0;
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_buffer = new char[DEFLATE_BUFFER_SIZE];
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int rc = deflateInit2(&_zstr, level, Z_DEFLATED, 15 + (type == STREAM_GZIP ? 16 : 0), 8, Z_DEFAULT_STRATEGY);
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if (rc != Z_OK)
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{
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delete [] _buffer;
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throw IOException(zError(rc));
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}
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}
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DeflatingStreamBuf::DeflatingStreamBuf(std::ostream& ostr, int windowBits, int level):
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BufferedStreamBuf(STREAM_BUFFER_SIZE, std::ios::out),
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_pIstr(0),
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_pOstr(&ostr),
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_eof(false)
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{
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_zstr.zalloc = Z_NULL;
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_zstr.zfree = Z_NULL;
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_zstr.opaque = Z_NULL;
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_zstr.next_in = 0;
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_zstr.avail_in = 0;
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_zstr.next_out = 0;
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_zstr.avail_out = 0;
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_buffer = new char[DEFLATE_BUFFER_SIZE];
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int rc = deflateInit2(&_zstr, level, Z_DEFLATED, windowBits, 8, Z_DEFAULT_STRATEGY);
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if (rc != Z_OK)
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{
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delete [] _buffer;
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throw IOException(zError(rc));
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}
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}
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DeflatingStreamBuf::~DeflatingStreamBuf()
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{
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try
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{
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close();
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}
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catch (...)
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{
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}
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delete [] _buffer;
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deflateEnd(&_zstr);
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}
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int DeflatingStreamBuf::close()
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{
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BufferedStreamBuf::sync();
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_pIstr = 0;
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if (_pOstr)
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{
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if (_zstr.next_out)
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{
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int rc = deflate(&_zstr, Z_FINISH);
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if (rc != Z_OK && rc != Z_STREAM_END) throw IOException(zError(rc));
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_pOstr->write(_buffer, DEFLATE_BUFFER_SIZE - _zstr.avail_out);
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if (!_pOstr->good()) throw IOException(zError(rc));
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_zstr.next_out = (unsigned char*) _buffer;
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_zstr.avail_out = DEFLATE_BUFFER_SIZE;
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while (rc != Z_STREAM_END)
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{
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rc = deflate(&_zstr, Z_FINISH);
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if (rc != Z_OK && rc != Z_STREAM_END) throw IOException(zError(rc));
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_pOstr->write(_buffer, DEFLATE_BUFFER_SIZE - _zstr.avail_out);
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if (!_pOstr->good()) throw IOException(zError(rc));
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_zstr.next_out = (unsigned char*) _buffer;
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_zstr.avail_out = DEFLATE_BUFFER_SIZE;
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}
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}
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_pOstr = 0;
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}
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return 0;
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}
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int DeflatingStreamBuf::sync()
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{
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if (BufferedStreamBuf::sync())
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return -1;
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if (_pOstr && _zstr.next_out)
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{
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int rc = deflate(&_zstr, Z_SYNC_FLUSH);
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if (rc != Z_OK) throw IOException(zError(rc));
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_pOstr->write(_buffer, DEFLATE_BUFFER_SIZE - _zstr.avail_out);
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if (!_pOstr->good()) throw IOException(zError(rc));
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while (_zstr.avail_out == 0)
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{
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_zstr.next_out = (unsigned char*) _buffer;
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_zstr.avail_out = DEFLATE_BUFFER_SIZE;
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rc = deflate(&_zstr, Z_SYNC_FLUSH);
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if (rc != Z_OK) throw IOException(zError(rc));
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_pOstr->write(_buffer, DEFLATE_BUFFER_SIZE - _zstr.avail_out);
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if (!_pOstr->good()) throw IOException(zError(rc));
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};
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_zstr.next_out = (unsigned char*) _buffer;
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_zstr.avail_out = DEFLATE_BUFFER_SIZE;
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}
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return 0;
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}
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int DeflatingStreamBuf::readFromDevice(char* buffer, std::streamsize length)
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{
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if (!_pIstr) return 0;
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if (_zstr.avail_in == 0 && !_eof)
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{
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int n = 0;
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if (_pIstr->good())
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{
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_pIstr->read(_buffer, DEFLATE_BUFFER_SIZE);
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n = static_cast<int>(_pIstr->gcount());
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}
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if (n > 0)
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{
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_zstr.next_in = (unsigned char*) _buffer;
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_zstr.avail_in = n;
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}
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else
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{
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_zstr.next_in = 0;
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_zstr.avail_in = 0;
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_eof = true;
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}
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}
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_zstr.next_out = (unsigned char*) buffer;
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_zstr.avail_out = static_cast<unsigned>(length);
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for (;;)
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{
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int rc = deflate(&_zstr, _eof ? Z_FINISH : Z_NO_FLUSH);
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if (_eof && rc == Z_STREAM_END)
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{
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_pIstr = 0;
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return static_cast<int>(length) - _zstr.avail_out;
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}
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if (rc != Z_OK) throw IOException(zError(rc));
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if (_zstr.avail_out == 0)
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{
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return static_cast<int>(length);
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}
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if (_zstr.avail_in == 0)
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{
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int n = 0;
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if (_pIstr->good())
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{
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_pIstr->read(_buffer, DEFLATE_BUFFER_SIZE);
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n = static_cast<int>(_pIstr->gcount());
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}
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if (n > 0)
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{
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_zstr.next_in = (unsigned char*) _buffer;
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_zstr.avail_in = n;
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}
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else
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{
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_zstr.next_in = 0;
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_zstr.avail_in = 0;
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_eof = true;
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}
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}
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}
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}
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int DeflatingStreamBuf::writeToDevice(const char* buffer, std::streamsize length)
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{
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if (length == 0 || !_pOstr) return 0;
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_zstr.next_in = (unsigned char*) buffer;
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_zstr.avail_in = static_cast<unsigned>(length);
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_zstr.next_out = (unsigned char*) _buffer;
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_zstr.avail_out = DEFLATE_BUFFER_SIZE;
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for (;;)
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{
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int rc = deflate(&_zstr, Z_NO_FLUSH);
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if (rc != Z_OK) throw IOException(zError(rc));
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if (_zstr.avail_out == 0)
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{
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_pOstr->write(_buffer, DEFLATE_BUFFER_SIZE);
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if (!_pOstr->good()) throw IOException(zError(rc));
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_zstr.next_out = (unsigned char*) _buffer;
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_zstr.avail_out = DEFLATE_BUFFER_SIZE;
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}
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if (_zstr.avail_in == 0)
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{
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_pOstr->write(_buffer, DEFLATE_BUFFER_SIZE - _zstr.avail_out);
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if (!_pOstr->good()) throw IOException(zError(rc));
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_zstr.next_out = (unsigned char*) _buffer;
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_zstr.avail_out = DEFLATE_BUFFER_SIZE;
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break;
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}
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}
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return static_cast<int>(length);
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}
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DeflatingIOS::DeflatingIOS(std::ostream& ostr, DeflatingStreamBuf::StreamType type, int level):
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_buf(ostr, type, level)
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{
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poco_ios_init(&_buf);
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}
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DeflatingIOS::DeflatingIOS(std::ostream& ostr, int windowBits, int level):
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_buf(ostr, windowBits, level)
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{
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poco_ios_init(&_buf);
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}
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DeflatingIOS::DeflatingIOS(std::istream& istr, DeflatingStreamBuf::StreamType type, int level):
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_buf(istr, type, level)
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{
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poco_ios_init(&_buf);
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}
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DeflatingIOS::DeflatingIOS(std::istream& istr, int windowBits, int level):
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_buf(istr, windowBits, level)
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{
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poco_ios_init(&_buf);
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}
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DeflatingIOS::~DeflatingIOS()
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{
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}
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DeflatingStreamBuf* DeflatingIOS::rdbuf()
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{
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return &_buf;
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}
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DeflatingOutputStream::DeflatingOutputStream(std::ostream& ostr, DeflatingStreamBuf::StreamType type, int level):
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DeflatingIOS(ostr, type, level),
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std::ostream(&_buf)
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{
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}
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DeflatingOutputStream::DeflatingOutputStream(std::ostream& ostr, int windowBits, int level):
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DeflatingIOS(ostr, windowBits, level),
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std::ostream(&_buf)
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{
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}
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DeflatingOutputStream::~DeflatingOutputStream()
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{
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}
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int DeflatingOutputStream::close()
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{
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return _buf.close();
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}
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int DeflatingOutputStream::sync()
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{
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return _buf.pubsync();
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}
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DeflatingInputStream::DeflatingInputStream(std::istream& istr, DeflatingStreamBuf::StreamType type, int level):
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DeflatingIOS(istr, type, level),
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std::istream(&_buf)
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{
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}
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DeflatingInputStream::DeflatingInputStream(std::istream& istr, int windowBits, int level):
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DeflatingIOS(istr, windowBits, level),
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std::istream(&_buf)
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{
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}
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DeflatingInputStream::~DeflatingInputStream()
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{
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}
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} // namespace Poco
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