src/hash.c

   1 /*
   2  * This file is free software; you can redistribute it and/or modify
   3  * it under the terms of the GNU General Public License, version 2,
   4  * as published by the Free Software Foundation.
   5  *
   6  * In addition to the permissions in the GNU General Public License,
   7  * the authors give you unlimited permission to link the compiled
   8  * version of this file into combinations with other programs,
   9  * and to distribute those combinations without any restriction
  10  * coming from the use of this file.  (The General Public License
  11  * restrictions do apply in other respects; for example, they cover
  12  * modification of the file, and distribution when not linked into
  13  * a combined executable.)
  14  *
  15  * This file is distributed in the hope that it will be useful, but
  16  * WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  * General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; see the file COPYING.  If not, write to
  22  * the Free Software Foundation, 51 Franklin Street, Fifth Floor,
  23  * Boston, MA 02110-1301, USA.
  24  */
  25
  26 #include "common.h"
  27 #include "hash.h"
  28
  29 #if defined(PPC_SHA1)
  30 # include "ppc/sha1.h"
  31 #else
  32 # include "sha1.h"
  33 #endif
  34
  35 struct git_hash_ctx {
  36         SHA_CTX c;
  37 };
  38
  39 git_hash_ctx *git_hash_new_ctx(void)
  40 {
  41         git_hash_ctx *ctx = git__malloc(sizeof(*ctx));
  42
  43         if (!ctx)
  44                 return NULL;
  45
  46         SHA1_Init(&ctx->c);
  47
  48         return ctx;
  49 }
  50
  51 void git_hash_free_ctx(git_hash_ctx *ctx)
  52 {
  53         free(ctx);
  54 }
  55
  56 void git_hash_init(git_hash_ctx *ctx)
  57 {
  58         assert(ctx);
  59         SHA1_Init(&ctx->c);
  60 }
  61
  62 void git_hash_update(git_hash_ctx *ctx, const void *data, size_t len)
  63 {
  64         assert(ctx);
  65         SHA1_Update(&ctx->c, data, len);
  66 }
  67
  68 void git_hash_final(git_oid *out, git_hash_ctx *ctx)
  69 {
  70         assert(ctx);
  71         SHA1_Final(out->id, &ctx->c);
  72 }
  73
  74 void git_hash_buf(git_oid *out, const void *data, size_t len)
  75 {
  76         SHA_CTX c;
  77
  78         SHA1_Init(&c);
  79         SHA1_Update(&c, data, len);
  80         SHA1_Final(out->id, &c);
  81 }
  82
  83 void git_hash_vec(git_oid *out, git_buf_vec *vec, size_t n)
  84 {
  85         SHA_CTX c;
  86         size_t i;
  87
  88         SHA1_Init(&c);
  89         for (i = 0; i < n; i++)
  90                 SHA1_Update(&c, vec[i].data, vec[i].len);
  91         SHA1_Final(out->id, &c);
  92 }