Andrew's git - gitweb.git/blob

   1#include "cache.h"
   2
   3const signed char hexval_table[256] = {
   4         -1, -1, -1, -1, -1, -1, -1, -1,                /* 00-07 */
   5         -1, -1, -1, -1, -1, -1, -1, -1,                /* 08-0f */
   6         -1, -1, -1, -1, -1, -1, -1, -1,                /* 10-17 */
   7         -1, -1, -1, -1, -1, -1, -1, -1,                /* 18-1f */
   8         -1, -1, -1, -1, -1, -1, -1, -1,                /* 20-27 */
   9         -1, -1, -1, -1, -1, -1, -1, -1,                /* 28-2f */
  10          0,  1,  2,  3,  4,  5,  6,  7,                /* 30-37 */
  11          8,  9, -1, -1, -1, -1, -1, -1,                /* 38-3f */
  12         -1, 10, 11, 12, 13, 14, 15, -1,                /* 40-47 */
  13         -1, -1, -1, -1, -1, -1, -1, -1,                /* 48-4f */
  14         -1, -1, -1, -1, -1, -1, -1, -1,                /* 50-57 */
  15         -1, -1, -1, -1, -1, -1, -1, -1,                /* 58-5f */
  16         -1, 10, 11, 12, 13, 14, 15, -1,                /* 60-67 */
  17         -1, -1, -1, -1, -1, -1, -1, -1,                /* 68-67 */
  18         -1, -1, -1, -1, -1, -1, -1, -1,                /* 70-77 */
  19         -1, -1, -1, -1, -1, -1, -1, -1,                /* 78-7f */
  20         -1, -1, -1, -1, -1, -1, -1, -1,                /* 80-87 */
  21         -1, -1, -1, -1, -1, -1, -1, -1,                /* 88-8f */
  22         -1, -1, -1, -1, -1, -1, -1, -1,                /* 90-97 */
  23         -1, -1, -1, -1, -1, -1, -1, -1,                /* 98-9f */
  24         -1, -1, -1, -1, -1, -1, -1, -1,                /* a0-a7 */
  25         -1, -1, -1, -1, -1, -1, -1, -1,                /* a8-af */
  26         -1, -1, -1, -1, -1, -1, -1, -1,                /* b0-b7 */
  27         -1, -1, -1, -1, -1, -1, -1, -1,                /* b8-bf */
  28         -1, -1, -1, -1, -1, -1, -1, -1,                /* c0-c7 */
  29         -1, -1, -1, -1, -1, -1, -1, -1,                /* c8-cf */
  30         -1, -1, -1, -1, -1, -1, -1, -1,                /* d0-d7 */
  31         -1, -1, -1, -1, -1, -1, -1, -1,                /* d8-df */
  32         -1, -1, -1, -1, -1, -1, -1, -1,                /* e0-e7 */
  33         -1, -1, -1, -1, -1, -1, -1, -1,                /* e8-ef */
  34         -1, -1, -1, -1, -1, -1, -1, -1,                /* f0-f7 */
  35         -1, -1, -1, -1, -1, -1, -1, -1,                /* f8-ff */
  36};
  37
  38int get_sha1_hex(const char *hex, unsigned char *sha1)
  39{
  40        int i;
  41        for (i = 0; i < 20; i++) {
  42                unsigned int val;
  43                /*
  44                 * hex[1]=='\0' is caught when val is checked below,
  45                 * but if hex[0] is NUL we have to avoid reading
  46                 * past the end of the string:
  47                 */
  48                if (!hex[0])
  49                        return -1;
  50                val = (hexval(hex[0]) << 4) | hexval(hex[1]);
  51                if (val & ~0xff)
  52                        return -1;
  53                *sha1++ = val;
  54                hex += 2;
  55        }
  56        return 0;
  57}
  58
  59char *sha1_to_hex(const unsigned char *sha1)
  60{
  61        static int bufno;
  62        static char hexbuffer[4][41];
  63        static const char hex[] = "0123456789abcdef";
  64        char *buffer = hexbuffer[3 & ++bufno], *buf = buffer;
  65        int i;
  66
  67        for (i = 0; i < 20; i++) {
  68                unsigned int val = *sha1++;
  69                *buf++ = hex[val >> 4];
  70                *buf++ = hex[val & 0xf];
  71        }
  72        *buf = '\0';
  73
  74        return buffer;
  75}