michael@0: /*
michael@0:  *  Copyright 2012 The LibYuv Project Authors. All rights reserved.
michael@0:  *
michael@0:  *  Use of this source code is governed by a BSD-style license
michael@0:  *  that can be found in the LICENSE file in the root of the source
michael@0:  *  tree. An additional intellectual property rights grant can be found
michael@0:  *  in the file PATENTS. All contributing project authors may
michael@0:  *  be found in the AUTHORS file in the root of the source tree.
michael@0:  */
michael@0: 
michael@0: #include "libyuv/mjpeg_decoder.h"
michael@0: 
michael@0: #ifdef __cplusplus
michael@0: namespace libyuv {
michael@0: extern "C" {
michael@0: #endif
michael@0: 
michael@0: // Helper function to validate the jpeg appears intact.
michael@0: // TODO(fbarchard): Optimize case where SOI is found but EOI is not.
michael@0: LIBYUV_BOOL ValidateJpeg(const uint8* sample, size_t sample_size) {
michael@0:   size_t i;
michael@0:   if (sample_size < 64) {
michael@0:     // ERROR: Invalid jpeg size: sample_size
michael@0:     return LIBYUV_FALSE;
michael@0:   }
michael@0:   if (sample[0] != 0xff || sample[1] != 0xd8) {  // Start Of Image
michael@0:     // ERROR: Invalid jpeg initial start code
michael@0:     return LIBYUV_FALSE;
michael@0:   }
michael@0:   for (i = sample_size - 2; i > 1;) {
michael@0:     if (sample[i] != 0xd9) {
michael@0:       if (sample[i] == 0xff && sample[i + 1] == 0xd9) {  // End Of Image
michael@0:         return LIBYUV_TRUE;  // Success: Valid jpeg.
michael@0:       }
michael@0:       --i;
michael@0:     }
michael@0:     --i;
michael@0:   }
michael@0:   // ERROR: Invalid jpeg end code not found. Size sample_size
michael@0:   return LIBYUV_FALSE;
michael@0: }
michael@0: 
michael@0: #ifdef __cplusplus
michael@0: }  // extern "C"
michael@0: }  // namespace libyuv
michael@0: #endif
michael@0: