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