src/hash.c

   1 /*
   2  * Copyright (C) 2009-2011 the libgit2 contributors
   3  *
   4  * This file is part of libgit2, distributed under the GNU GPL v2 with
   5  * a Linking Exception. For full terms see the included COPYING file.
   6  */
   7
   8 #include "common.h"
   9 #include "hash.h"
  10
  11 #if defined(PPC_SHA1)
  12 # include "ppc/sha1.h"
  13 #else
  14 # include "sha1.h"
  15 #endif
  16
  17 struct git_hash_ctx {
  18         SHA_CTX c;
  19 };
  20
  21 git_hash_ctx *git_hash_new_ctx(void)
  22 {
  23         git_hash_ctx *ctx = git__malloc(sizeof(*ctx));
  24
  25         if (!ctx)
  26                 return NULL;
  27
  28         SHA1_Init(&ctx->c);
  29
  30         return ctx;
  31 }
  32
  33 void git_hash_free_ctx(git_hash_ctx *ctx)
  34 {
  35         free(ctx);
  36 }
  37
  38 void git_hash_init(git_hash_ctx *ctx)
  39 {
  40         assert(ctx);
  41         SHA1_Init(&ctx->c);
  42 }
  43
  44 void git_hash_update(git_hash_ctx *ctx, const void *data, size_t len)
  45 {
  46         assert(ctx);
  47         SHA1_Update(&ctx->c, data, len);
  48 }
  49
  50 void git_hash_final(git_oid *out, git_hash_ctx *ctx)
  51 {
  52         assert(ctx);
  53         SHA1_Final(out->id, &ctx->c);
  54 }
  55
  56 void git_hash_buf(git_oid *out, const void *data, size_t len)
  57 {
  58         SHA_CTX c;
  59
  60         SHA1_Init(&c);
  61         SHA1_Update(&c, data, len);
  62         SHA1_Final(out->id, &c);
  63 }
  64
  65 void git_hash_vec(git_oid *out, git_buf_vec *vec, size_t n)
  66 {
  67         SHA_CTX c;
  68         size_t i;
  69
  70         SHA1_Init(&c);
  71         for (i = 0; i < n; i++)
  72                 SHA1_Update(&c, vec[i].data, vec[i].len);
  73         SHA1_Final(out->id, &c);
  74 }