libgit-thin/ltsha1.c

   1 /**
   2  * @file
   3  *
   4  * SHA-1 handling related functions
   5  *
   6  * Luiz Fernando N. Capitulino
   7  * <lcapitulino@gmail.com>
   8  */
   9 #include <string.h>
  10 #include <errno.h>
  11
  12 #include <cache.h>
  13
  14 #include "ltsha1.h"
  15
  16 /**
  17  * Convert a 40-byte hexadecimal string SHA1 representation into
  18  * a (raw) 20 byte sequence.
  19  *
  20  * \param hex hexdecimal string to be converted
  21  * \param sha1 20-byte array to return the conversion result into
  22  *
  23  * \return 0 on success, -1 otherwise.
  24  */
  25 int git_hex_to_sha1(const char *hex, unsigned char *sha1)
  26 {
  27         if (!hex || !sha1) {
  28                 errno = EINVAL;
  29                 return -1;
  30         }
  31
  32         return get_sha1_hex(hex, sha1);
  33 }
  34
  35 /**
  36  * Convert a (raw) 20-byte SHA1 sequence into a 40-byte hexadecimal
  37  * string representation.
  38  *
  39  * \param sha1 20-byte SHA1 array to be converted
  40  * \param hex 41-byte array to be filled with the 40-byte hexadecimal
  41  *            representation plus the trailing \\0 character
  42  *
  43  * \return 0 on success, -1 otherwise.
  44  */
  45 int git_sha1_to_hex(const unsigned char *sha1, char *hex)
  46 {
  47         char *p;
  48
  49         if (!sha1 || !hex) {
  50                 errno = EINVAL;
  51                 return -1;
  52         }
  53
  54         p = sha1_to_hex(sha1);
  55         if (!p)
  56                 return -1;
  57
  58         strncpy(hex, p, GIT_HEX_LENGTH+1);
  59         return 0;
  60 }