1 files changed, 71 insertions, 0 deletions
diff --git a/src/core/HashUtils.cpp b/src/core/HashUtils.cpp
new file mode 100644
index 0000000..5b9acd1
--- /dev/null
+++ b/src/core/HashUtils.cpp
@@ -0,0 +1,71 @@
+/*
+Copyright (c) 2003-2010 Sony Pictures Imageworks Inc., et al.
+All Rights Reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+* Redistributions of source code must retain the above copyright
+  notice, this list of conditions and the following disclaimer.
+* Redistributions in binary form must reproduce the above copyright
+  notice, this list of conditions and the following disclaimer in the
+  documentation and/or other materials provided with the distribution.
+* Neither the name of Sony Pictures Imageworks nor the names of its
+  contributors may be used to endorse or promote products derived from
+  this software without specific prior written permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+#include <OpenColorIO/OpenColorIO.h>
+
+#include "HashUtils.h"
+#include "md5/md5.h"
+
+#include <sstream>
+#include <iostream>
+
+OCIO_NAMESPACE_ENTER
+{
+    std::string CacheIDHash(const char * array, int size)
+    {
+        md5_state_t state;
+        md5_byte_t digest[16];
+        
+        md5_init(&state);
+        md5_append(&state, (const md5_byte_t *)array, size);
+        md5_finish(&state, digest);
+        
+        return GetPrintableHash(digest);
+    }
+    
+    std::string GetPrintableHash(const md5_byte_t * digest)
+    {
+        static char charmap[] = "0123456789abcdef";
+        
+        char printableResult[34];
+        char *ptr = printableResult;
+        
+        // build a printable string from unprintable chars.  first character
+        // of hashed cache IDs is '$', to later check if it's already been hashed
+        *ptr++ = '$';
+        for (int i=0;i<16;++i)
+        {
+            *ptr++ = charmap[(digest[i] & 0x0F)];
+            *ptr++ = charmap[(digest[i] >> 4)];
+        }
+        *ptr++ = 0;
+        
+        return std::string(printableResult);
+    }
+}
+OCIO_NAMESPACE_EXIT