1 ///////////////////////////////////////////////////////////////////////////
2 //
3 // Copyright (c) 2004, Industrial Light & Magic, a division of Lucas
4 // Digital Ltd. LLC
5 //
6 // All rights reserved.
7 //
8 // Redistribution and use in source and binary forms, with or without
9 // modification, are permitted provided that the following conditions are
10 // met:
11 // * Redistributions of source code must retain the above copyright
12 // notice, this list of conditions and the following disclaimer.
13 // * Redistributions in binary form must reproduce the above
14 // copyright notice, this list of conditions and the following disclaimer
15 // in the documentation and/or other materials provided with the
16 // distribution.
17 // * Neither the name of Industrial Light & Magic nor the names of
18 // its contributors may be used to endorse or promote products derived
19 // from this software without specific prior written permission.
20 //
21 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
24 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
25 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
26 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
27 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
31 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 //
33 ///////////////////////////////////////////////////////////////////////////
34
35
36
37 //-----------------------------------------------------------------------------
38 //
39 // class ZipCompressor
40 //
41 //-----------------------------------------------------------------------------
42
43 #include "ImfZipCompressor.h"
44 #include "ImfCheckedArithmetic.h"
45 #include "Iex.h"
46 #include <zlib.h>
47 #include "ImfNamespace.h"
48
49 OPENEXR_IMF_INTERNAL_NAMESPACE_SOURCE_ENTER
50
51
ZipCompressor(const Header & hdr,size_t maxScanLineSize,size_t numScanLines)52 ZipCompressor::ZipCompressor
53 (const Header &hdr,
54 size_t maxScanLineSize,
55 size_t numScanLines)
56 :
57 Compressor (hdr),
58 _maxScanLineSize (maxScanLineSize),
59 _numScanLines (numScanLines),
60 _outBuffer (0),
61 _zip(maxScanLineSize, numScanLines)
62 {
63 _outBuffer = new char[_zip.maxCompressedSize()];
64 }
65
66
~ZipCompressor()67 ZipCompressor::~ZipCompressor ()
68 {
69 delete [] _outBuffer;
70 }
71
72
73 int
numScanLines() const74 ZipCompressor::numScanLines () const
75 {
76 return _numScanLines;
77 }
78
79
80 int
compress(const char * inPtr,int inSize,int minY,const char * & outPtr)81 ZipCompressor::compress (const char *inPtr,
82 int inSize,
83 int minY,
84 const char *&outPtr)
85 {
86 //
87 // Special case �- empty input buffer
88 //
89
90 if (inSize == 0)
91 {
92 outPtr = _outBuffer;
93 return 0;
94 }
95
96 int outSize = _zip.compress(inPtr, inSize, _outBuffer);
97
98 outPtr = _outBuffer;
99 return outSize;
100 }
101
102
103 int
uncompress(const char * inPtr,int inSize,int minY,const char * & outPtr)104 ZipCompressor::uncompress (const char *inPtr,
105 int inSize,
106 int minY,
107 const char *&outPtr)
108 {
109 //
110 // Special case �- empty input buffer
111 //
112
113 if (inSize == 0)
114 {
115 outPtr = _outBuffer;
116 return 0;
117 }
118
119 int outSize = _zip.uncompress(inPtr, inSize, _outBuffer);
120
121 outPtr = _outBuffer;
122 return outSize;
123 }
124
125
126 OPENEXR_IMF_INTERNAL_NAMESPACE_SOURCE_EXIT
127
128