/src/core/HashUtils.cpp

 1/*
 2Copyright (c) 2003-2010 Sony Pictures Imageworks Inc., et al.
 3All Rights Reserved.
 4
 5Redistribution and use in source and binary forms, with or without
 6modification, are permitted provided that the following conditions are
 7met:
 8* Redistributions of source code must retain the above copyright
 9  notice, this list of conditions and the following disclaimer.
10* Redistributions in binary form must reproduce the above copyright
11  notice, this list of conditions and the following disclaimer in the
12  documentation and/or other materials provided with the distribution.
13* Neither the name of Sony Pictures Imageworks nor the names of its
14  contributors may be used to endorse or promote products derived from
15  this software without specific prior written permission.
16THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27*/
28
29#include <OpenColorIO/OpenColorIO.h>
30
31#include "HashUtils.h"
32#include "md5/md5.h"
33
34#include <sstream>
35#include <iostream>
36
37OCIO_NAMESPACE_ENTER
38{
39    std::string CacheIDHash(const char * array, int size)
40    {
41        md5_state_t state;
42        md5_byte_t digest[16];
43        
44        md5_init(&state);
45        md5_append(&state, (const md5_byte_t *)array, size);
46        md5_finish(&state, digest);
47        
48        return GetPrintableHash(digest);
49    }
50    
51    std::string GetPrintableHash(const md5_byte_t * digest)
52    {
53        static char charmap[] = "0123456789abcdef";
54        
55        char printableResult[34];
56        char *ptr = printableResult;
57        
58        // build a printable string from unprintable chars.  first character
59        // of hashed cache IDs is '$', to later check if it's already been hashed
60        *ptr++ = '$';
61        for (int i=0;i<16;++i)
62        {
63            *ptr++ = charmap[(digest[i] & 0x0F)];
64            *ptr++ = charmap[(digest[i] >> 4)];
65        }
66        *ptr++ = 0;
67        
68        return std::string(printableResult);
69    }
70}
71OCIO_NAMESPACE_EXIT