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PATH: usr / include / ffmpeg / libavutil

/*
 * 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);

/**
 * Finalize a hash context and compute the actual hash value.
 * If size is smaller than the hash size, the hash is truncated;
 * if size is larger, the buffer is padded with 0.
 */
void av_hash_final_bin(struct AVHashContext *ctx, uint8_t *dst, int size);

/**
 * Finalize a hash context and compute the actual hash value as a hex string.
 * The string is always 0-terminated.
 * If size is smaller than 2 * hash_size + 1, the hex string is truncated.
 */
void av_hash_final_hex(struct AVHashContext *ctx, uint8_t *dst, int size);

/**
 * Finalize a hash context and compute the actual hash value as a base64 string.
 * The string is always 0-terminated.
 * If size is smaller than AV_BASE64_SIZE(hash_size), the base64 string is
 * truncated.
 */
void av_hash_final_b64(struct AVHashContext *ctx, uint8_t *dst, int size);

/**
 * Free hash context.
 */
void av_hash_freep(struct AVHashContext **ctx);

#endif /* AVUTIL_HASH_H */

[-] dict.h [edit]
[-] md5.h [edit]
[-] file.h [edit]
[-] version.h [edit]
[-] eval.h [edit]
[-] aes.h [edit]
[-] sha512.h [edit]
[-] replaygain.h [edit]
[-] samplefmt.h [edit]
[-] threadmessage.h [edit]
[-] motion_vector.h [edit]
[-] pixdesc.h [edit]
[-] old_pix_fmts.h [edit]
[-] intreadwrite.h [edit]
[-] tea.h [edit]
[+] ..
[-] base64.h [edit]
[-] stereo3d.h [edit]
[-] avassert.h [edit]
[-] opt.h [edit]
[-] mem.h [edit]
[-] parseutils.h [edit]
[-] camellia.h [edit]
[-] random_seed.h [edit]
[-] cast5.h [edit]
[-] bswap.h [edit]
[-] pixelutils.h [edit]
[-] attributes.h [edit]
[-] log.h [edit]
[-] avstring.h [edit]
[-] imgutils.h [edit]
[-] adler32.h [edit]
[-] crc.h [edit]
[-] time.h [edit]
[-] audio_fifo.h [edit]
[-] hash.h [edit]
[-] intfloat.h [edit]
[-] timecode.h [edit]
[-] lzo.h [edit]
[-] ffversion.h [edit]
[-] frame.h [edit]
[-] hmac.h [edit]
[-] cpu.h [edit]
[-] lfg.h [edit]
[-] bprint.h [edit]
[-] xtea.h [edit]
[-] murmur3.h [edit]
[-] rational.h [edit]
[-] avconfig.h [edit]
[-] downmix_info.h [edit]
[-] display.h [edit]
[-] error.h [edit]
[-] twofish.h [edit]
[-] pixfmt.h [edit]
[-] common.h [edit]
[-] avutil.h [edit]
[-] audioconvert.h [edit]
[-] channel_layout.h [edit]
[-] macros.h [edit]
[-] timestamp.h [edit]
[-] mathematics.h [edit]
[-] sha.h [edit]
[-] ripemd.h [edit]
[-] blowfish.h [edit]
[-] fifo.h [edit]
[-] buffer.h [edit]