/*
  * Copyright (c) 2003-2010 Michael Niedermayer <michaelni@gmx.at>
  *
  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
  * FFmpeg is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /**
  * @file
  * Accelerated start code search function for start codes common to
  * MPEG-1/2/4 video, VC-1, H.264/5
  * @author Michael Niedermayer <michaelni@gmx.at>
  */
 
 #include "startcode.h"
 #include "config.h"
 
 int ff_startcode_find_candidate_c(const uint8_t *buf, int size)
 {
     int i = 0;
 #if HAVE_FAST_UNALIGNED
     /* we check i < size instead of i + 3 / 7 because it is

      * simpler and there must be AV_INPUT_BUFFER_PADDING_SIZE

      * bytes at the end.
      */

 #if HAVE_FAST_64BIT

     while (i < size &&
             !((~*(const uint64_t *)(buf + i) &
                     (*(const uint64_t *)(buf + i) - 0x0101010101010101ULL)) &
                     0x8080808080808080ULL))
         i += 8;

 #else

     while (i < size &&
             !((~*(const uint32_t *)(buf + i) &
                     (*(const uint32_t *)(buf + i) - 0x01010101U)) &
                     0x80808080U))
         i += 4;

 #endif

 #endif
     for (; i < size; i++)
         if (!buf[i])
             break;
     return i;
 }