courgette/crc.cc

   1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "courgette/crc.h"
   6
   7 #ifdef COURGETTE_USE_CRC_LIB
   8 #  include "zlib.h"
   9 #else
  10 extern "C" {
  11 #  include "third_party/lzma_sdk/7zCrc.h"
  12 }
  13 #endif
  14
  15 #include "base/basictypes.h"
  16
  17 namespace courgette {
  18
  19 uint32 CalculateCrc(const uint8* buffer, size_t size) {
  20   uint32 crc;
  21
  22 #ifdef COURGETTE_USE_CRC_LIB
  23   // Calculate Crc by calling CRC method in zlib
  24   crc = crc32(0, buffer, size);
  25 #else
  26   // Calculate Crc by calling CRC method in LZMA SDK
  27   CrcGenerateTable();
  28   crc = CrcCalc(buffer, size);
  29 #endif
  30
  31   return ~crc;
  32 }
  33
  34 }  // namespace