1 /* 2 * Copyright 2012 The LibYuv Project Authors. All rights reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 #include "libyuv/mjpeg_decoder.h" 12 13 #ifdef __cplusplus 14 namespace libyuv { 15 extern "C" { 16 #endif 17 18 // Helper function to validate the jpeg appears intact. 19 // TODO(fbarchard): Optimize case where SOI is found but EOI is not. 20 LIBYUV_BOOL ValidateJpeg(const uint8* sample, size_t sample_size) { 21 size_t i; 22 if (sample_size < 64) { 23 // ERROR: Invalid jpeg size: sample_size 24 return LIBYUV_FALSE; 25 } 26 if (sample[0] != 0xff || sample[1] != 0xd8) { // Start Of Image 27 // ERROR: Invalid jpeg initial start code 28 return LIBYUV_FALSE; 29 } 30 for (i = sample_size - 2; i > 1;) { 31 if (sample[i] != 0xd9) { 32 if (sample[i] == 0xff && sample[i + 1] == 0xd9) { // End Of Image 33 return LIBYUV_TRUE; // Success: Valid jpeg. 34 } 35 --i; 36 } 37 --i; 38 } 39 // ERROR: Invalid jpeg end code not found. Size sample_size 40 return LIBYUV_FALSE; 41 } 42 43 #ifdef __cplusplus 44 } // extern "C" 45 } // namespace libyuv 46 #endif 47 48
