rlz/lib/crc32_wrapper.cc

   1 // Copyright (c) 2012 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 // A wrapper around ZLib's CRC functions to put them in the rlz_lib namespace
   6 // and use our types.
   7
   8 #include "rlz/lib/assert.h"
   9 #include "rlz/lib/crc32.h"
  10 #include "rlz/lib/string_utils.h"
  11 #include "third_party/zlib/zlib.h"
  12
  13 namespace rlz_lib {
  14
  15 int Crc32(const unsigned char* buf, int length) {
  16   return crc32(0L, buf, length);
  17 }
  18
  19 bool Crc32(const char* text, int* crc) {
  20   if (!crc) {
  21     ASSERT_STRING("Crc32: crc is NULL.");
  22     return false;
  23   }
  24
  25   *crc = 0;
  26   for (int i = 0; text[i]; i++) {
  27     if (!IsAscii(text[i]))
  28       return false;
  29
  30     *crc = crc32(*crc, reinterpret_cast<const unsigned char*>(text + i), 1);
  31   }
  32
  33   return true;
  34 }
  35
  36 }  // namespace rlz_lib