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 #include "sha1.h"
  29
  30 struct git_hash_ctx {
  31         SHA_CTX c;
  32 };
  33
  34 git_hash_ctx *git_hash_new_ctx(void)
  35 {
  36         git_hash_ctx *ctx = git__malloc(sizeof(*ctx));
  37
  38         if (!ctx)
  39                 return NULL;
  40
  41         SHA1_Init(&ctx->c);
  42
  43         return ctx;
  44 }
  45
  46 void git_hash_free_ctx(git_hash_ctx *ctx)
  47 {
  48         free(ctx);
  49 }
  50
  51 void git_hash_init(git_hash_ctx *ctx)
  52 {
  53         assert(ctx);
  54         SHA1_Init(&ctx->c);
  55 }
  56
  57 void git_hash_update(git_hash_ctx *ctx, const void *data, size_t len)
  58 {
  59         assert(ctx);
  60         SHA1_Update(&ctx->c, data, len);
  61 }
  62
  63 void git_hash_final(git_oid *out, git_hash_ctx *ctx)
  64 {
  65         assert(ctx);
  66         SHA1_Final(out->id, &ctx->c);
  67 }
  68
  69 void git_hash_buf(git_oid *out, const void *data, size_t len)
  70 {
  71         SHA_CTX c;
  72
  73         SHA1_Init(&c);
  74         SHA1_Update(&c, data, len);
  75         SHA1_Final(out->id, &c);
  76 }
  77
  78 void git_hash_vec(git_oid *out, git_buf_vec *vec, size_t n)
  79 {
  80         SHA_CTX c;
  81         size_t i;
  82
  83         SHA1_Init(&c);
  84         for (i = 0; i < n; i++)
  85                 SHA1_Update(&c, vec[i].data, vec[i].len);
  86         SHA1_Final(out->id, &c);
  87 }