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kbzip2filter.cpp
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1/* This file is part of the KDE libraries
2 Copyright (C) 2000-2005 David Faure <faure@kde.org>
3
4 This library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Library General Public
6 License as published by the Free Software Foundation; either
7 version 2 of the License, or (at your option) any later version.
8
9 This library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Library General Public License for more details.
13
14 You should have received a copy of the GNU Library General Public License
15 along with this library; see the file COPYING.LIB. If not, write to
16 the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
17 Boston, MA 02110-1301, USA.
18*/
19
20#include "kbzip2filter.h"
21
22#include <config-compression.h>
23
24#if HAVE_BZIP2_SUPPORT
25
26// we don't need that
27#define BZ_NO_STDIO
28extern "C" {
29 #include <bzlib.h>
30}
31
32#if NEED_BZ2_PREFIX
33 #define bzDecompressInit(x,y,z) BZ2_bzDecompressInit(x,y,z)
34 #define bzDecompressEnd(x) BZ2_bzDecompressEnd(x)
35 #define bzCompressEnd(x) BZ2_bzCompressEnd(x)
36 #define bzDecompress(x) BZ2_bzDecompress(x)
37 #define bzCompress(x,y) BZ2_bzCompress(x, y)
38 #define bzCompressInit(x,y,z,a) BZ2_bzCompressInit(x, y, z, a);
39#endif
40
41#include <kdebug.h>
42
43#include <QDebug>
44
45#include <qiodevice.h>
46
47
48
49// For docu on this, see /usr/doc/bzip2-0.9.5d/bzip2-0.9.5d/manual_3.html
50
51class KBzip2Filter::Private
52{
53public:
54 Private()
55 : isInitialized(false)
56 {
57 memset(&zStream, 0, sizeof(zStream));
58 mode = 0;
59 }
60
61 bz_stream zStream;
62 int mode;
63 bool isInitialized;
64};
65
66KBzip2Filter::KBzip2Filter()
67 :d(new Private)
68{
69}
70
71
72KBzip2Filter::~KBzip2Filter()
73{
74 delete d;
75}
76
77void KBzip2Filter::init( int mode )
78{
79 if (d->isInitialized) {
80 terminate();
81 }
82
83 d->zStream.next_in = 0;
84 d->zStream.avail_in = 0;
85 if ( mode == QIODevice::ReadOnly )
86 {
87 (void)bzDecompressInit(&d->zStream, 0, 0);
88 //qDebug() << "bzDecompressInit returned " << result;
89 // TODO: test result and return false on error
90 } else if ( mode == QIODevice::WriteOnly ) {
91 (void)bzCompressInit(&d->zStream, 5, 0, 0);
92 //qDebug() << "bzDecompressInit returned " << result;
93 // TODO: test result and return false on error
94 } else {
95 qWarning() << "Unsupported mode " << mode << ". Only QIODevice::ReadOnly and QIODevice::WriteOnly supported";
96 // TODO return false
97 }
98 d->mode = mode;
99 d->isInitialized = true;
100}
101
102int KBzip2Filter::mode() const
103{
104 return d->mode;
105}
106
107void KBzip2Filter::terminate()
108{
109 if (d->mode == QIODevice::ReadOnly) {
110 int result = bzDecompressEnd(&d->zStream);
111 // TODO: test result and return false on error
112 //qDebug() << "bzDecompressEnd returned " << result;
113 } else if (d->mode == QIODevice::WriteOnly) {
114 int result = bzCompressEnd(&d->zStream);
115 // TODO: test result and return false on error
116 //qDebug() << "bzCompressEnd returned " << result;
117 } else {
118 qWarning() << "Unsupported mode " << d->mode << ". Only QIODevice::ReadOnly and QIODevice::WriteOnly supported";
119 // TODO return false
120 }
121 d->isInitialized = false;
122}
123
124
125void KBzip2Filter::reset()
126{
127 // bzip2 doesn't seem to have a reset call...
128 terminate();
129 init( d->mode );
130}
131
132void KBzip2Filter::setOutBuffer( char * data, uint maxlen )
133{
134 d->zStream.avail_out = maxlen;
135 d->zStream.next_out = data;
136}
137
138void KBzip2Filter::setInBuffer( const char *data, unsigned int size )
139{
140 d->zStream.avail_in = size;
141 d->zStream.next_in = const_cast<char *>(data);
142}
143
144int KBzip2Filter::inBufferAvailable() const
145{
146 return d->zStream.avail_in;
147}
148
149int KBzip2Filter::outBufferAvailable() const
150{
151 return d->zStream.avail_out;
152}
153
154KBzip2Filter::Result KBzip2Filter::uncompress()
155{
156 //qDebug() << "Calling bzDecompress with avail_in=" << inBufferAvailable() << " avail_out=" << outBufferAvailable();
157 int result = bzDecompress(&d->zStream);
158 if ( result < BZ_OK )
159 {
160 kWarning() << "bzDecompress returned" << result;
161 }
162
163 switch (result) {
164 case BZ_OK:
165 return KFilterBase::Ok;
166 case BZ_STREAM_END:
167 return KFilterBase::End;
168 default:
169 return KFilterBase::Error;
170 }
171}
172
173KBzip2Filter::Result KBzip2Filter::compress( bool finish )
174{
175 //qDebug() << "Calling bzCompress with avail_in=" << inBufferAvailable() << " avail_out=" << outBufferAvailable();
176 int result = bzCompress(&d->zStream, finish ? BZ_FINISH : BZ_RUN );
177
178 switch (result) {
179 case BZ_OK:
180 case BZ_FLUSH_OK:
181 case BZ_RUN_OK:
182 case BZ_FINISH_OK:
183 return KFilterBase::Ok;
184 break;
185 case BZ_STREAM_END:
186 //qDebug() << " bzCompress returned " << result;
187 return KFilterBase::End;
188 break;
189 default:
190 //qDebug() << " bzCompress returned " << result;
191 return KFilterBase::Error;
192 break;
193 }
194}
195
196#endif /* HAVE_BZIP2_SUPPORT */
KFilterBase::Error
@ Error
Definition: kfilterbase.h:82
KFilterBase::End
@ End
Definition: kfilterbase.h:82
KFilterBase::Ok
@ Ok
Definition: kfilterbase.h:82
kWarning
#define kWarning
Definition: kdebug.h:322
kbzip2filter.h
kdebug.h
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