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/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef EBMLUTIL_H_
#define EBMLUTIL_H_
#include <stdint.h>
namespace webm {
// Encode the id and/or size of an EBML element bytes by setting a leading length descriptor bit:
//
// 1xxxxxxx - 1-byte values
// 01xxxxxx xxxxxxxx -
// 001xxxxx xxxxxxxx xxxxxxxx -
// 0001xxxx xxxxxxxx xxxxxxxx xxxxxxxx - ...
// 00001xxx xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx -
// 000001xx xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx -
// 0000001x xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx -
// 00000001 xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx - 8-byte values
//
// This function uses the least the number of bytes possible.
uint64_t encodeUnsigned(uint64_t u);
// Like above but pads the input value with leading zeros up to the specified width. The length
// descriptor is calculated based on width.
uint64_t encodeUnsigned(uint64_t u, int width);
// Serialize an EBML coded id or size in big-endian order.
int serializeCodedUnsigned(uint64_t u, uint8_t* bary);
// Calculate the length of an EBML coded id or size from its length descriptor.
int sizeOf(uint64_t u);
}
#endif /* EBMLUTIL_H_ */
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