| /* |
| * 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_ */ |