forked from mirror/libbpg
222 lines
7.4 KiB
C++
222 lines
7.4 KiB
C++
/* The copyright in this software is being made available under the BSD
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* License, included below. This software may be subject to other third party
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* and contributor rights, including patent rights, and no such rights are
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* granted under this license.
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*
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* Copyright (c) 2010-2014, ITU/ISO/IEC
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* * Neither the name of the ITU/ISO/IEC nor the names of its contributors may
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* be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "TComPicYuv.h"
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#include "libmd5/MD5.h"
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//! \ingroup TLibCommon
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//! \{
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/**
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* Update md5 using n samples from plane, each sample is adjusted to
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* OUTBIT_BITDEPTH_DIV8.
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*/
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template<UInt OUTPUT_BITDEPTH_DIV8>
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static Void md5_block(MD5& md5, const Pel* plane, UInt n)
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{
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/* create a 64 byte buffer for packing Pel's into */
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UChar buf[64/OUTPUT_BITDEPTH_DIV8][OUTPUT_BITDEPTH_DIV8];
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for (UInt i = 0; i < n; i++)
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{
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Pel pel = plane[i];
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/* perform bitdepth and endian conversion */
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for (UInt d = 0; d < OUTPUT_BITDEPTH_DIV8; d++)
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{
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buf[i][d] = pel >> (d*8);
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}
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}
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md5.update((UChar*)buf, n * OUTPUT_BITDEPTH_DIV8);
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}
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/**
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* Update md5 with all samples in plane in raster order, each sample
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* is adjusted to OUTBIT_BITDEPTH_DIV8.
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*/
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template<UInt OUTPUT_BITDEPTH_DIV8>
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static Void md5_plane(MD5& md5, const Pel* plane, UInt width, UInt height, UInt stride)
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{
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/* N is the number of samples to process per md5 update.
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* All N samples must fit in buf */
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UInt N = 32;
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UInt width_modN = width % N;
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UInt width_less_modN = width - width_modN;
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for (UInt y = 0; y < height; y++)
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{
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/* convert pels into unsigned chars in little endian byte order.
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* NB, for 8bit data, data is truncated to 8bits. */
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for (UInt x = 0; x < width_less_modN; x += N)
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md5_block<OUTPUT_BITDEPTH_DIV8>(md5, &plane[y*stride + x], N);
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/* mop up any of the remaining line */
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md5_block<OUTPUT_BITDEPTH_DIV8>(md5, &plane[y*stride + width_less_modN], width_modN);
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}
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}
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UInt compCRC(Int bitdepth, const Pel* plane, UInt width, UInt height, UInt stride, TComDigest &digest)
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{
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UInt crcMsb;
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UInt bitVal;
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UInt crcVal = 0xffff;
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UInt bitIdx;
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for (UInt y = 0; y < height; y++)
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{
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for (UInt x = 0; x < width; x++)
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{
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// take CRC of first pictureData byte
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for(bitIdx=0; bitIdx<8; bitIdx++)
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{
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crcMsb = (crcVal >> 15) & 1;
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bitVal = (plane[y*stride+x] >> (7 - bitIdx)) & 1;
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crcVal = (((crcVal << 1) + bitVal) & 0xffff) ^ (crcMsb * 0x1021);
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}
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// take CRC of second pictureData byte if bit depth is greater than 8-bits
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if(bitdepth > 8)
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{
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for(bitIdx=0; bitIdx<8; bitIdx++)
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{
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crcMsb = (crcVal >> 15) & 1;
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bitVal = (plane[y*stride+x] >> (15 - bitIdx)) & 1;
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crcVal = (((crcVal << 1) + bitVal) & 0xffff) ^ (crcMsb * 0x1021);
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}
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}
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}
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}
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for(bitIdx=0; bitIdx<16; bitIdx++)
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{
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crcMsb = (crcVal >> 15) & 1;
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crcVal = ((crcVal << 1) & 0xffff) ^ (crcMsb * 0x1021);
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}
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digest.hash.push_back((crcVal>>8) & 0xff);
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digest.hash.push_back( crcVal & 0xff);
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return 2;
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}
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UInt calcCRC(const TComPicYuv& pic, TComDigest &digest)
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{
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UInt digestLen=0;
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digest.hash.clear();
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for(Int chan=0; chan<pic.getNumberValidComponents(); chan++)
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{
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const ComponentID compID=ComponentID(chan);
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digestLen=compCRC(g_bitDepth[toChannelType(compID)], pic.getAddr(compID), pic.getWidth(compID), pic.getHeight(compID), pic.getStride(compID), digest);
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}
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return digestLen;
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}
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UInt compChecksum(Int bitdepth, const Pel* plane, UInt width, UInt height, UInt stride, TComDigest &digest)
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{
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UInt checksum = 0;
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UChar xor_mask;
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for (UInt y = 0; y < height; y++)
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{
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for (UInt x = 0; x < width; x++)
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{
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xor_mask = (x & 0xff) ^ (y & 0xff) ^ (x >> 8) ^ (y >> 8);
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checksum = (checksum + ((plane[y*stride+x] & 0xff) ^ xor_mask)) & 0xffffffff;
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if(bitdepth > 8)
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{
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checksum = (checksum + ((plane[y*stride+x]>>8) ^ xor_mask)) & 0xffffffff;
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}
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}
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}
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digest.hash.push_back((checksum>>24) & 0xff);
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digest.hash.push_back((checksum>>16) & 0xff);
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digest.hash.push_back((checksum>>8) & 0xff);
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digest.hash.push_back( checksum & 0xff);
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return 4;
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}
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UInt calcChecksum(const TComPicYuv& pic, TComDigest &digest)
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{
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UInt digestLen=0;
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digest.hash.clear();
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for(Int chan=0; chan<pic.getNumberValidComponents(); chan++)
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{
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const ComponentID compID=ComponentID(chan);
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digestLen=compChecksum(g_bitDepth[toChannelType(compID)], pic.getAddr(compID), pic.getWidth(compID), pic.getHeight(compID), pic.getStride(compID), digest);
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}
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return digestLen;
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}
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/**
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* Calculate the MD5sum of pic, storing the result in digest.
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* MD5 calculation is performed on Y' then Cb, then Cr; each in raster order.
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* Pel data is inserted into the MD5 function in little-endian byte order,
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* using sufficient bytes to represent the picture bitdepth. Eg, 10bit data
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* uses little-endian two byte words; 8bit data uses single byte words.
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*/
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UInt calcMD5(const TComPicYuv& pic, TComDigest &digest)
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{
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/* choose an md5_plane packing function based on the system bitdepth */
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typedef Void (*MD5PlaneFunc)(MD5&, const Pel*, UInt, UInt, UInt);
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MD5PlaneFunc md5_plane_func;
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MD5 md5[MAX_NUM_COMPONENT];
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digest.hash.clear();
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for(Int chan=0; chan<pic.getNumberValidComponents(); chan++)
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{
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const ComponentID compID=ComponentID(chan);
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md5_plane_func = g_bitDepth[toChannelType(compID)] <= 8 ? (MD5PlaneFunc)md5_plane<1> : (MD5PlaneFunc)md5_plane<2>;
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UChar tmp_digest[MD5_DIGEST_STRING_LENGTH];
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md5_plane_func(md5[compID], pic.getAddr(compID), pic.getWidth(compID), pic.getHeight(compID), pic.getStride(compID));
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md5[compID].finalize(tmp_digest);
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for(UInt i=0; i<MD5_DIGEST_STRING_LENGTH; i++)
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{
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digest.hash.push_back(tmp_digest[i]);
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}
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}
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return 16;
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}
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std::string digestToString(const TComDigest &digest, Int numChar)
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{
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static const Char* hex = "0123456789abcdef";
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std::string result;
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for(Int pos=0; pos<Int(digest.hash.size()); pos++)
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{
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if ((pos % numChar) == 0 && pos!=0 ) result += ',';
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result += hex[digest.hash[pos] >> 4];
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result += hex[digest.hash[pos] & 0xf];
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}
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return result;
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}
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//! \}
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