2 * Copyright (C) 2013 Reimar Döffinger <Reimar.Doeffinger@gmx.de>
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
31 #include "intreadwrite.h"
45 typedef struct AVHashContext {
57 [MURMUR3] = {"murmur3", 16},
58 [SHA160] = {"SHA160", 20},
59 [SHA224] = {"SHA224", 28},
60 [SHA256] = {"SHA256", 32},
61 [CRC32] = {"CRC32", 4},
62 [ADLER32] = {"adler32", 4},
65 const char *av_hash_names(int i)
67 if (i < 0 || i >= NUM_HASHES) return NULL;
68 return hashdesc[i].name;
71 const char *av_hash_get_name(const AVHashContext *ctx)
73 return hashdesc[ctx->type].name;
76 int av_hash_get_size(const AVHashContext *ctx)
78 return hashdesc[ctx->type].size;
81 int av_hash_alloc(AVHashContext **ctx, const char *name)
86 for (i = 0; i < NUM_HASHES; i++)
87 if (av_strcasecmp(name, hashdesc[i].name) == 0)
89 if (i >= NUM_HASHES) return AVERROR(EINVAL);
90 res = av_mallocz(sizeof(*res));
91 if (!res) return AVERROR(ENOMEM);
94 case MD5: res->ctx = av_md5_alloc(); break;
95 case MURMUR3: res->ctx = av_murmur3_alloc(); break;
98 case SHA256: res->ctx = av_sha_alloc(); break;
99 case CRC32: res->crctab = av_crc_get_table(AV_CRC_32_IEEE_LE); break;
102 if (i != ADLER32 && i != CRC32 && !res->ctx) {
104 return AVERROR(ENOMEM);
110 void av_hash_init(AVHashContext *ctx)
113 case MD5: av_md5_init(ctx->ctx); break;
114 case MURMUR3: av_murmur3_init(ctx->ctx); break;
115 case SHA160: av_sha_init(ctx->ctx, 160); break;
116 case SHA224: av_sha_init(ctx->ctx, 224); break;
117 case SHA256: av_sha_init(ctx->ctx, 256); break;
118 case CRC32: ctx->crc = UINT32_MAX; break;
119 case ADLER32: ctx->crc = 1; break;
123 void av_hash_update(AVHashContext *ctx, const uint8_t *src, int len)
126 case MD5: av_md5_update(ctx->ctx, src, len); break;
127 case MURMUR3: av_murmur3_update(ctx->ctx, src, len); break;
130 case SHA256: av_sha_update(ctx->ctx, src, len); break;
131 case CRC32: ctx->crc = av_crc(ctx->crctab, ctx->crc, src, len); break;
132 case ADLER32: ctx->crc = av_adler32_update(ctx->crc, src, len); break;
136 void av_hash_final(AVHashContext *ctx, uint8_t *dst)
139 case MD5: av_md5_final(ctx->ctx, dst); break;
140 case MURMUR3: av_murmur3_final(ctx->ctx, dst); break;
143 case SHA256: av_sha_final(ctx->ctx, dst); break;
144 case CRC32: AV_WB32(dst, ctx->crc ^ UINT32_MAX); break;
145 case ADLER32: AV_WB32(dst, ctx->crc); break;
149 void av_hash_freep(AVHashContext **ctx)
152 av_freep(&(*ctx)->ctx);