thodg/libgit2/src/oid.c

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• Hash : af795e49
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  Date : 2008-12-02T09:56:23
  

  Add routines to convert git_oid to hex strings [sp: Credit for some of this implementation goes to Pieter, I started off a patch he proposed for libgit2 but reworked enough of it that I don't want to blame him for any bugs.] Suggested-by: Pieter de Bie <pdebie@ai.rug.nl> Signed-off-by: Shawn O. Pearce <spearce@spearce.org>

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• src/oid.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 "git/oid.h"
  #include <string.h>
  
  static signed char from_hex[] = {
  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* 00 */
  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* 10 */
  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* 20 */
   0,  1,  2,  3,  4,  5,  6,  7,  8,  9, -1, -1, -1, -1, -1, -1, /* 30 */
  -1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* 40 */
  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* 50 */
  -1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* 60 */
  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* 70 */
  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* 80 */
  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* 90 */
  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* a0 */
  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* b0 */
  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* c0 */
  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* d0 */
  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* e0 */
  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* f0 */
  };
  static char to_hex[] = "0123456789abcdef";
  
  int git_oid_mkstr(git_oid *out, const char *str)
  {
  	int p;
  	for (p = 0; p < sizeof(out->id); p++, str += 2) {
  		int v = (from_hex[(unsigned char)str[0]] << 4)
  		       | from_hex[(unsigned char)str[1]];
  		if (v < 0)
  			return GIT_ENOTOID;
  		out->id[p] = (unsigned char)v;
  	}
  	return GIT_SUCCESS;
  }
  
  static inline char *fmt_one(char *str, unsigned int val)
  {
  	*str++ = to_hex[val >> 4];
  	*str++ = to_hex[val & 0xf];
  	return str;
  }
  
  void git_oid_fmt(char *str, const git_oid *oid)
  {
  	int i;
  
  	for (i = 0; i < sizeof(oid->id); i++)
  		str = fmt_one(str, oid->id[i]);
  }
  
  void git_oid_pathfmt(char *str, const git_oid *oid)
  {
  	int i;
  
  	str = fmt_one(str, oid->id[0]);
  	*str++ = '/';
  	for (i = 1; i < sizeof(oid->id); i++)
  		str = fmt_one(str, oid->id[i]);
  }
  
  char *git_oid_allocfmt(const git_oid *oid)
  {
  	char *str = malloc(GIT_OID_HEXSZ + 1);
  	if (!str)
  		return NULL;
  	git_oid_fmt(str, oid);
  	str[GIT_OID_HEXSZ] = '\0';
  	return str;
  }
  

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