| 0,0 → 1,90 |
|---|
| /* |
| * Copyright (C) 2013 Reimar Döffinger <Reimar.Doeffinger@gmx.de> |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #ifndef AVUTIL_HASH_H |
| #define AVUTIL_HASH_H |
| |
| #include <stdint.h> |
| |
| struct AVHashContext; |
| |
| /** |
| * Allocate a hash context for the algorithm specified by name. |
| * |
| * @return >= 0 for success, a negative error code for failure |
| * @note The context is not initialized, you must call av_hash_init(). |
| */ |
| int av_hash_alloc(struct AVHashContext **ctx, const char *name); |
| |
| /** |
| * Get the names of available hash algorithms. |
| * |
| * This function can be used to enumerate the algorithms. |
| * |
| * @param i index of the hash algorithm, starting from 0 |
| * @return a pointer to a static string or NULL if i is out of range |
| */ |
| const char *av_hash_names(int i); |
| |
| /** |
| * Get the name of the algorithm corresponding to the given hash context. |
| */ |
| const char *av_hash_get_name(const struct AVHashContext *ctx); |
| |
| /** |
| * Maximum value that av_hash_get_size will currently return. |
| * |
| * You can use this if you absolutely want or need to use static allocation |
| * and are fine with not supporting hashes newly added to libavutil without |
| * recompilation. |
| * Note that you still need to check against av_hash_get_size, adding new hashes |
| * with larger sizes will not be considered an ABI change and should not cause |
| * your code to overflow a buffer. |
| */ |
| #define AV_HASH_MAX_SIZE 64 |
| |
| /** |
| * Get the size of the resulting hash value in bytes. |
| * |
| * The pointer passed to av_hash_final have space for at least this many bytes. |
| */ |
| int av_hash_get_size(const struct AVHashContext *ctx); |
| |
| /** |
| * Initialize or reset a hash context. |
| */ |
| void av_hash_init(struct AVHashContext *ctx); |
| |
| /** |
| * Update a hash context with additional data. |
| */ |
| void av_hash_update(struct AVHashContext *ctx, const uint8_t *src, int len); |
| |
| /** |
| * Finalize a hash context and compute the actual hash value. |
| */ |
| void av_hash_final(struct AVHashContext *ctx, uint8_t *dst); |
| |
| /** |
| * Free hash context. |
| */ |
| void av_hash_freep(struct AVHashContext **ctx); |
| |
| #endif /* AVUTIL_HASH_H */ |