summaryrefslogtreecommitdiff
path: root/package/source/zipapi/Deflater.cxx
blob: 70fe26dde1072183fb004e722a6848286f3aec7b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
 * This file is part of the LibreOffice project.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * This file incorporates work covered by the following license notice:
 *
 *   Licensed to the Apache Software Foundation (ASF) under one or more
 *   contributor license agreements. See the NOTICE file distributed
 *   with this work for additional information regarding copyright
 *   ownership. The ASF licenses this file to you under the Apache
 *   License, Version 2.0 (the "License"); you may not use this file
 *   except in compliance with the License. You may obtain a copy of
 *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
 */

#include <package/Deflater.hxx>
#include <zlib.h>
#include <com/sun/star/packages/zip/ZipConstants.hpp>
#include <osl/diagnose.h>
#include <string.h>

using namespace com::sun::star::packages::zip::ZipConstants;
using namespace com::sun::star;
using namespace ZipUtils;

/** Provides general purpose compression using the ZLIB compression
 * library.
 */

Deflater::~Deflater(void)
{
    end();
}
void Deflater::init (sal_Int32 nLevelArg, sal_Int32 nStrategyArg, bool bNowrap)
{
    pStream = new z_stream;
    /* Memset it to 0...sets zalloc/zfree/opaque to NULL */
    memset (pStream, 0, sizeof(*pStream));

    switch (deflateInit2(pStream, nLevelArg, Z_DEFLATED, bNowrap? -MAX_WBITS : MAX_WBITS,
                DEF_MEM_LEVEL, nStrategyArg))
    {
        case Z_OK:
            break;
        case Z_MEM_ERROR:
            delete pStream;
            break;
        case Z_STREAM_ERROR:
            delete pStream;
            break;
        default:
             break;
    }
}

Deflater::Deflater(sal_Int32 nSetLevel, bool bNowrap)
: bFinish(false)
, bFinished(false)
, nStrategy(DEFAULT_STRATEGY)
, nOffset(0)
, nLength(0)
{
    init(nSetLevel, DEFAULT_STRATEGY, bNowrap);
}

sal_Int32 Deflater::doDeflateBytes (uno::Sequence < sal_Int8 > &rBuffer, sal_Int32 nNewOffset, sal_Int32 nNewLength)
{
    sal_Int32 nResult;
    pStream->next_in   = (unsigned char*) sInBuffer.getConstArray() + nOffset;
    pStream->next_out  = (unsigned char*) rBuffer.getArray()+nNewOffset;
    pStream->avail_in  = nLength;
    pStream->avail_out = nNewLength;

#if !defined Z_PREFIX
    nResult = deflate(pStream, bFinish ? Z_FINISH : Z_NO_FLUSH);
#else
    nResult = z_deflate(pStream, bFinish ? Z_FINISH : Z_NO_FLUSH);
#endif
    switch (nResult)
    {
        case Z_STREAM_END:
            bFinished = true;
        case Z_OK:
            nOffset += nLength - pStream->avail_in;
            nLength = pStream->avail_in;
            return nNewLength - pStream->avail_out;
        default:
            return 0;
    }
}

void SAL_CALL Deflater::setInputSegment( const uno::Sequence< sal_Int8 >& rBuffer )
{
    sInBuffer = rBuffer;
    nOffset = 0;
    nLength = rBuffer.getLength();
}

bool SAL_CALL Deflater::needsInput(  )
{
    return nLength <=0;
}
void SAL_CALL Deflater::finish(  )
{
    bFinish = true;
}
sal_Int32 SAL_CALL Deflater::doDeflateSegment( uno::Sequence< sal_Int8 >& rBuffer, sal_Int32 nNewOffset, sal_Int32 nNewLength )
{
    OSL_ASSERT( !(nNewOffset < 0 || nNewLength < 0 || nNewOffset + nNewLength > rBuffer.getLength()));
    return doDeflateBytes(rBuffer, nNewOffset, nNewLength);
}
sal_Int64 SAL_CALL Deflater::getTotalIn(  )
{
    return pStream->total_in; // FIXME64: zlib doesn't look 64bit clean here
}
sal_Int64 SAL_CALL Deflater::getTotalOut(  )
{
    return pStream->total_out; // FIXME64: zlib doesn't look 64bit clean here
}
void SAL_CALL Deflater::reset(  )
{
#if !defined Z_PREFIX
    deflateReset(pStream);
#else
    z_deflateReset(pStream);
#endif
    bFinish = false;
    bFinished = false;
    nOffset = nLength = 0;
}
void SAL_CALL Deflater::end(  )
{
    if (pStream != NULL)
    {
#if !defined Z_PREFIX
        deflateEnd(pStream);
#else
        z_deflateEnd(pStream);
#endif
        delete pStream;
    }
    pStream = NULL;
}

/* vim:set shiftwidth=4 softtabstop=4 expandtab: */