Disabled external gits

cs440-acg/ext/openexr/OpenEXR/IlmImf/ImfRle.cpp

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+///////////////////////////////////////////////////////////////////////////
+//
+// Copyright (c) 2002, Industrial Light & Magic, a division of Lucas
+// Digital Ltd. LLC
+// 
+// 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 Industrial Light & Magic 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 <string.h>
+#include "ImfRle.h"
+#include "ImfNamespace.h"
+
+OPENEXR_IMF_INTERNAL_NAMESPACE_SOURCE_ENTER
+
+namespace {
+
+const int MIN_RUN_LENGTH = 3;
+const int MAX_RUN_LENGTH = 127;
+
+}
+
+//
+// Compress an array of bytes, using run-length encoding,
+// and return the length of the compressed data.
+//
+
+int
+rleCompress (int inLength, const char in[], signed char out[])
+{
+    const char *inEnd = in + inLength;
+    const char *runStart = in;
+    const char *runEnd = in + 1;
+    signed char *outWrite = out;
+
+    while (runStart < inEnd)
+    {
+	while (runEnd < inEnd &&
+	       *runStart == *runEnd &&
+	       runEnd - runStart - 1 < MAX_RUN_LENGTH)
+	{
+	    ++runEnd;
+	}
+
+	if (runEnd - runStart >= MIN_RUN_LENGTH)
+	{
+	    //
+	    // Compressable run
+	    //
+
+	    *outWrite++ = (runEnd - runStart) - 1;
+	    *outWrite++ = *(signed char *) runStart;
+	    runStart = runEnd;
+	}
+	else
+	{
+	    //
+	    // Uncompressable run
+	    //
+
+	    while (runEnd < inEnd &&
+		   ((runEnd + 1 >= inEnd ||
+		     *runEnd != *(runEnd + 1)) ||
+		    (runEnd + 2 >= inEnd ||
+		     *(runEnd + 1) != *(runEnd + 2))) &&
+		   runEnd - runStart < MAX_RUN_LENGTH)
+	    {
+		++runEnd;
+	    }
+
+	    *outWrite++ = runStart - runEnd;
+
+	    while (runStart < runEnd)
+	    {
+		*outWrite++ = *(signed char *) (runStart++);
+	    }
+	}
+
+	++runEnd;
+    }
+
+    return outWrite - out;
+}
+
+
+//
+// Uncompress an array of bytes compressed with rleCompress().
+// Returns the length of the oncompressed data, or 0 if the
+// length of the uncompressed data would be more than maxLength.
+//
+
+int
+rleUncompress (int inLength, int maxLength, const signed char in[], char out[])
+{
+    char *outStart = out;
+
+    while (inLength > 0)
+    {
+	if (*in < 0)
+	{
+	    int count = -((int)*in++);
+	    inLength -= count + 1;
+
+	    if (0 > (maxLength -= count))
+		return 0;
+
+        memcpy(out, in, count);
+        out += count;
+        in  += count;
+	}
+	else
+	{
+	    int count = *in++;
+	    inLength -= 2;
+
+	    if (0 > (maxLength -= count + 1))
+		return 0;
+
+        memset(out, *(char*)in, count+1);
+        out += count+1;
+
+	    in++;
+	}
+    }
+
+    return out - outStart;
+}
+
+
+
+
+OPENEXR_IMF_INTERNAL_NAMESPACE_SOURCE_EXIT