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Viewing changes to Foundation/src/InflatingStream.cpp

  • Committer: Bazaar Package Importer
  • Author(s): Krzysztof Burghardt
  • Date: 2007-04-27 18:33:48 UTC
  • Revision ID: james.westby@ubuntu.com-20070427183348-xgnpct0qd6a2ip34
Tags: upstream-1.2.9
Import upstream version 1.2.9

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Foundation/src/InflatingStream.cpp
 
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//
 
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// InflatingStream.cpp
 
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//
 
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// $Id: //poco/1.2/Foundation/src/InflatingStream.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/InflatingStream.h"
 
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#include "Poco/Exception.h"
 
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namespace Poco {
 
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InflatingStreamBuf::InflatingStreamBuf(std::istream& istr, StreamType type): 
 
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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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        int rc = inflateInit2(&_zstr, 15 + (type == STREAM_GZIP ? 16 : 0));
 
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        if (rc != Z_OK) throw IOException(zError(rc)); 
 
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        _buffer = new char[INFLATE_BUFFER_SIZE];
 
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}
 
63
 
 
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InflatingStreamBuf::InflatingStreamBuf(std::ostream& ostr, StreamType type): 
 
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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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        int rc = inflateInit2(&_zstr, 15 + (type == STREAM_GZIP ? 16 : 0));
 
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        if (rc != Z_OK) throw IOException(zError(rc));
 
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        _buffer = new char[INFLATE_BUFFER_SIZE];
 
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}
 
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InflatingStreamBuf::~InflatingStreamBuf()
 
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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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}
 
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int InflatingStreamBuf::close()
 
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{
 
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        sync();
 
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        if (_pIstr || _pOstr)
 
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        {
 
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                int rc = inflateEnd(&_zstr);
 
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                if (rc != Z_OK) throw IOException(zError(rc));
 
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                _pIstr = 0;
 
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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 InflatingStreamBuf::readFromDevice(char* buffer, std::streamsize length)
 
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{
 
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        if (_eof || !_pIstr) return 0;
 
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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, INFLATE_BUFFER_SIZE);
 
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                        n = _pIstr->gcount();
 
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                }
 
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                if (n == 0) return 0;
 
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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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        _zstr.next_out  = (unsigned char*) buffer;
 
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        _zstr.avail_out = length;
 
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        for (;;)
 
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        {
 
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                int rc = inflate(&_zstr, Z_NO_FLUSH);
 
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                if (rc == Z_STREAM_END)
 
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                {
 
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                        _eof = true;
 
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                        return 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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                        return length;
 
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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, INFLATE_BUFFER_SIZE);
 
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                                n = _pIstr->gcount();
 
149
                        }
 
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                        if (n > 0)
 
151
                        {
 
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                                _zstr.next_in  = (unsigned char*) _buffer;
 
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                                _zstr.avail_in = n;
 
154
                        }
 
155
                }
 
156
        }
 
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}
 
158
 
 
159
 
 
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int InflatingStreamBuf::writeToDevice(const char* buffer, std::streamsize length)
 
161
{
 
162
        if (length == 0 || !_pOstr) return 0;
 
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164
        _zstr.next_in   = (unsigned char*) buffer;
 
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        _zstr.avail_in  = length;
 
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        _zstr.next_out  = (unsigned char*) _buffer;
 
167
        _zstr.avail_out = INFLATE_BUFFER_SIZE;
 
168
        for (;;)
 
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        {
 
170
                int rc = inflate(&_zstr, Z_NO_FLUSH);
 
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                if (rc == Z_STREAM_END)
 
172
                {
 
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                        _pOstr->write(_buffer, INFLATE_BUFFER_SIZE - _zstr.avail_out);
 
174
                        if (!_pOstr->good()) throw IOException(zError(rc));
 
175
                        break;
 
176
                }
 
177
                if (rc != Z_OK) throw IOException(zError(rc)); 
 
178
                if (_zstr.avail_out == 0)
 
179
                {
 
180
                        _pOstr->write(_buffer, INFLATE_BUFFER_SIZE);
 
181
                        if (!_pOstr->good()) throw IOException(zError(rc));
 
182
                        _zstr.next_out  = (unsigned char*) _buffer;
 
183
                        _zstr.avail_out = INFLATE_BUFFER_SIZE;
 
184
                }
 
185
                if (_zstr.avail_in == 0)
 
186
                {
 
187
                        _pOstr->write(_buffer, INFLATE_BUFFER_SIZE - _zstr.avail_out);
 
188
                        if (!_pOstr->good()) throw IOException(zError(rc)); 
 
189
                        _zstr.next_out  = (unsigned char*) _buffer;
 
190
                        _zstr.avail_out = INFLATE_BUFFER_SIZE;
 
191
                        break;
 
192
                }
 
193
        }
 
194
        return length;
 
195
}
 
196
 
 
197
 
 
198
InflatingIOS::InflatingIOS(std::ostream& ostr, InflatingStreamBuf::StreamType type):
 
199
        _buf(ostr, type)
 
200
{
 
201
        poco_ios_init(&_buf);
 
202
}
 
203
 
 
204
 
 
205
InflatingIOS::InflatingIOS(std::istream& istr, InflatingStreamBuf::StreamType type):
 
206
        _buf(istr, type)
 
207
{
 
208
        poco_ios_init(&_buf);
 
209
}
 
210
 
 
211
 
 
212
InflatingIOS::~InflatingIOS()
 
213
{
 
214
}
 
215
 
 
216
 
 
217
InflatingStreamBuf* InflatingIOS::rdbuf()
 
218
{
 
219
        return &_buf;
 
220
}
 
221
 
 
222
 
 
223
InflatingOutputStream::InflatingOutputStream(std::ostream& ostr, InflatingStreamBuf::StreamType type):
 
224
        InflatingIOS(ostr, type),
 
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        std::ostream(&_buf)
 
226
{
 
227
}
 
228
 
 
229
 
 
230
InflatingOutputStream::~InflatingOutputStream()
 
231
{
 
232
}
 
233
 
 
234
 
 
235
int InflatingOutputStream::close()
 
236
{
 
237
        return _buf.close();
 
238
}
 
239
 
 
240
 
 
241
InflatingInputStream::InflatingInputStream(std::istream& istr, InflatingStreamBuf::StreamType type):
 
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        InflatingIOS(istr, type),
 
243
        std::istream(&_buf)
 
244
{
 
245
}
 
246
 
 
247
 
 
248
InflatingInputStream::~InflatingInputStream()
 
249
{
 
250
}
 
251
 
 
252
 
 
253
} // namespace Poco