thodg/libgit2/src/hash.c

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• Hash : 007e0753
  Author :
  Date : 2008-12-27T18:58:25
  

  Add some routines for SHA1 hash computation [sp: Changed signature for output to use git_oid, and added a test case to verify an allocated git_hash_ctx can be reinitialized and reused.] Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk> Signed-off-by: Shawn O. Pearce <spearce@spearce.org>

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• src/hash.c

• /*
   * This file is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License, version 2,
   * as published by the Free Software Foundation.
   *
   * In addition to the permissions in the GNU General Public License,
   * the authors give you unlimited permission to link the compiled
   * version of this file into combinations with other programs,
   * and to distribute those combinations without any restriction
   * coming from the use of this file.  (The General Public License
   * restrictions do apply in other respects; for example, they cover
   * modification of the file, and distribution when not linked into
   * a combined executable.)
   *
   * This file is distributed in the hope that it will be useful, but
   * WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   * General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program; see the file COPYING.  If not, write to
   * the Free Software Foundation, 51 Franklin Street, Fifth Floor,
   * Boston, MA 02110-1301, USA.
   */
  
  #include "common.h"
  #include "hash.h"
  #include <openssl/sha.h>
  
  struct git_hash_ctx {
  	SHA_CTX c;
  };
  
  git_hash_ctx *git_hash_new_ctx(void)
  {
  	git_hash_ctx *ctx = malloc(sizeof(*ctx));
  
  	if (!ctx)
  		return NULL;
  
  	SHA1_Init(&ctx->c);
  
  	return ctx;
  }
  
  void git_hash_free_ctx(git_hash_ctx *ctx)
  {
  	free(ctx);
  }
  
  void git_hash_init(git_hash_ctx *ctx)
  {
  	assert(ctx);
  	SHA1_Init(&ctx->c);
  }
  
  void git_hash_update(git_hash_ctx *ctx, const void *data, size_t len)
  {
  	assert(ctx);
  	SHA1_Update(&ctx->c, data, len);
  }
  
  void git_hash_final(git_oid *out, git_hash_ctx *ctx)
  {
  	assert(ctx);
  	SHA1_Final(out->id, &ctx->c);
  }
  
  void git_hash_buf(git_oid *out, const void *data, size_t len)
  {
  	SHA_CTX c;
  
  	SHA1_Init(&c);
  	SHA1_Update(&c, data, len);
  	SHA1_Final(out->id, &c);
  }
  
  void git_hash_vec(git_oid *out, git_buf_vec *vec, size_t n)
  {
  	SHA_CTX c;
  	size_t i;
  
  	SHA1_Init(&c);
  	for (i = 0; i < n; i++)
  		SHA1_Update(&c, vec[i].data, vec[i].len);
  	SHA1_Final(out->id, &c);
  }
  

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