Disabled external gits

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

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+///////////////////////////////////////////////////////////////////////////
+//
+// Copyright (c) 2004, 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 "ImfZip.h"
+#include "ImfCheckedArithmetic.h"
+#include "ImfNamespace.h"
+#include "Iex.h"
+
+#include <math.h>
+#include <zlib.h>
+
+OPENEXR_IMF_INTERNAL_NAMESPACE_SOURCE_ENTER
+
+Imf::Zip::Zip(size_t maxRawSize):
+    _maxRawSize(maxRawSize),
+    _tmpBuffer(0)
+{
+    _tmpBuffer = new char[_maxRawSize];
+}
+
+Imf::Zip::Zip(size_t maxScanLineSize, size_t numScanLines):
+    _maxRawSize(0),
+    _tmpBuffer(0)
+{
+    _maxRawSize = uiMult (maxScanLineSize, numScanLines);
+    _tmpBuffer  = new char[_maxRawSize];
+}
+
+Imf::Zip::~Zip()
+{
+    if (_tmpBuffer) delete[] _tmpBuffer;
+}
+
+size_t
+Imf::Zip::maxRawSize()
+{
+    return _maxRawSize;
+}
+
+size_t
+Imf::Zip::maxCompressedSize()
+{
+    return uiAdd (uiAdd (_maxRawSize,
+               size_t (ceil (_maxRawSize * 0.01))),
+                  size_t (100));
+}
+
+int
+Imf::Zip::compress(const char *raw, int rawSize, char *compressed)
+{
+    //
+    // Reorder the pixel data.
+    //
+
+    {
+        char *t1 = _tmpBuffer;
+        char *t2 = _tmpBuffer + (rawSize + 1) / 2;
+        const char *stop = raw + rawSize;
+
+        while (true)
+        {
+            if (raw < stop)
+            *(t1++) = *(raw++);
+            else
+            break;
+
+            if (raw < stop)
+            *(t2++) = *(raw++);
+            else
+            break;
+        }
+    }
+
+    //
+    // Predictor.
+    //
+
+    {
+        unsigned char *t    = (unsigned char *) _tmpBuffer + 1;
+        unsigned char *stop = (unsigned char *) _tmpBuffer + rawSize;
+        int p = t[-1];
+
+        while (t < stop)
+        {
+            int d = int (t[0]) - p + (128 + 256);
+            p = t[0];
+            t[0] = d;
+            ++t;
+        }
+    }
+
+    //
+    // Compress the data using zlib
+    //
+
+    uLongf outSize = int(ceil(rawSize * 1.01)) + 100;
+
+    if (Z_OK != ::compress ((Bytef *)compressed, &outSize,
+                (const Bytef *) _tmpBuffer, rawSize))
+    {
+        throw Iex::BaseExc ("Data compression (zlib) failed.");
+    }
+
+    return outSize;
+}
+
+int
+Imf::Zip::uncompress(const char *compressed, int compressedSize,
+                                            char *raw)
+{
+    //
+    // Decompress the data using zlib
+    //
+
+    uLongf outSize = _maxRawSize;
+
+    if (Z_OK != ::uncompress ((Bytef *)_tmpBuffer, &outSize,
+                     (const Bytef *) compressed, compressedSize))
+    {
+        throw Iex::InputExc ("Data decompression (zlib) failed.");
+    }
+
+    //
+    // Predictor.
+    //
+    {
+        unsigned char *t    = (unsigned char *) _tmpBuffer + 1;
+        unsigned char *stop = (unsigned char *) _tmpBuffer + outSize;
+
+        while (t < stop)
+        {
+            int d = int (t[-1]) + int (t[0]) - 128;
+            t[0] = d;
+            ++t;
+        }
+    }
+
+    //
+    // Reorder the pixel data.
+    //
+
+    {
+        const char *t1 = _tmpBuffer;
+        const char *t2 = _tmpBuffer + (outSize + 1) / 2;
+        char *s = raw;
+        char *stop = s + outSize;
+
+        while (true)
+        {
+            if (s < stop)
+            *(s++) = *(t1++);
+            else
+            break;
+
+            if (s < stop)
+            *(s++) = *(t2++);
+            else
+            break;
+        }
+    }
+
+    return outSize;
+}
+
+OPENEXR_IMF_INTERNAL_NAMESPACE_SOURCE_EXIT