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:
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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
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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 // Utility routines to test quickly if a given
38 // file is an OpenEXR file, and whether the
39 // file is scanline-based or tiled.
40 //
41 //-----------------------------------------------------------------------------
42
43
44 #include <ImfTestFile.h>
45 #include <ImfStdIO.h>
46 #include <ImfXdr.h>
47 #include <ImfVersion.h>
48
49 namespace Imf {
50
51
52 bool
isOpenExrFile(const char fileName[],bool & tiled)53 isOpenExrFile (const char fileName[], bool &tiled)
54 {
55 try
56 {
57 StdIFStream is (fileName);
58
59 int magic, version;
60 Xdr::read <StreamIO> (is, magic);
61 Xdr::read <StreamIO> (is, version);
62
63 tiled = isTiled (version);
64 return magic == MAGIC;
65 }
66 catch (...)
67 {
68 tiled = false;
69 return false;
70 }
71 }
72
73
74 bool
isOpenExrFile(const char fileName[])75 isOpenExrFile (const char fileName[])
76 {
77 bool tiled;
78 return isOpenExrFile (fileName, tiled);
79 }
80
81
82 bool
isTiledOpenExrFile(const char fileName[])83 isTiledOpenExrFile (const char fileName[])
84 {
85 bool exr, tiled;
86 exr = isOpenExrFile (fileName, tiled);
87 return exr && tiled;
88 }
89
90
91 bool
isOpenExrFile(IStream & is,bool & tiled)92 isOpenExrFile (IStream &is, bool &tiled)
93 {
94 try
95 {
96 Int64 pos = is.tellg();
97
98 if (pos != 0)
99 is.seekg (0);
100
101 int magic, version;
102 Xdr::read <StreamIO> (is, magic);
103 Xdr::read <StreamIO> (is, version);
104
105 is.seekg (pos);
106
107 tiled = isTiled (version);
108 return magic == MAGIC;
109 }
110 catch (...)
111 {
112 is.clear();
113 tiled = false;
114 return false;
115 }
116 }
117
118
119 bool
isOpenExrFile(IStream & is)120 isOpenExrFile (IStream &is)
121 {
122 bool tiled;
123 return isOpenExrFile (is, tiled);
124 }
125
126
127 bool
isTiledOpenExrFile(IStream & is)128 isTiledOpenExrFile (IStream &is)
129 {
130 bool exr, tiled;
131 exr = isOpenExrFile (is, tiled);
132 return exr && tiled;
133 }
134
135 } // namespace Imf
136