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lavu/hash: Fix CRC32 calculation 

Initialize it with UINT32_MAX and xor the result with UINT32_MAX
as well.

Signed-off-by: James Almer <jamrial@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
James Almer 2013-05-15 18:36:40 -03:00 committed by Michael Niedermayer
parent c55c715c81
commit 35188e91ef
1 changed files with 3 additions and 3 deletions
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6
libavutil/hash.c
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@ -96,7 +96,7 @@ int av_hash_alloc(AVHashContext **ctx, const char *name)
case SHA160:
case SHA224:
case SHA256: res->ctx = av_sha_alloc(); break;
case CRC32: res->crctab = av_crc_get_table(AV_CRC_32_IEEE); break;
case CRC32: res->crctab = av_crc_get_table(AV_CRC_32_IEEE_LE); break;
case ADLER32: break;
}
if (i != ADLER32 && i != CRC32 && !res->ctx) {
@ -115,7 +115,7 @@ void av_hash_init(AVHashContext *ctx)
case SHA160: av_sha_init(ctx->ctx, 160); break;
case SHA224: av_sha_init(ctx->ctx, 224); break;
case SHA256: av_sha_init(ctx->ctx, 256); break;
case CRC32: ctx->crc = 0; break;
case CRC32: ctx->crc = UINT32_MAX; break;
case ADLER32: ctx->crc = 1; break;
}
}
@ -141,7 +141,7 @@ void av_hash_final(AVHashContext *ctx, uint8_t *dst)
case SHA160:
case SHA224:
case SHA256: av_sha_final(ctx->ctx, dst); break;
case CRC32: AV_WL32(dst, ctx->crc); break;
case CRC32: AV_WB32(dst, ctx->crc ^ UINT32_MAX); break;
case ADLER32: AV_WB32(dst, ctx->crc); break;
}
}