hex.c

   1 #include "cache.h"
   2
   3 const 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
  38 int hex_to_bytes(unsigned char *binary, const char *hex, size_t len)
  39 {
  40         for (; len; len--, hex += 2) {
  41                 unsigned int val = (hexval(hex[0]) << 4) | hexval(hex[1]);
  42
  43                 if (val & ~0xff)
  44                         return -1;
  45                 *binary++ = val;
  46         }
  47         return 0;
  48 }
  49
  50 int get_sha1_hex(const char *hex, unsigned char *sha1)
  51 {
  52         int i;
  53         for (i = 0; i < GIT_SHA1_RAWSZ; i++) {
  54                 int val = hex2chr(hex);
  55                 if (val < 0)
  56                         return -1;
  57                 *sha1++ = val;
  58                 hex += 2;
  59         }
  60         return 0;
  61 }
  62
  63 int get_oid_hex(const char *hex, struct object_id *oid)
  64 {
  65         return get_sha1_hex(hex, oid->hash);
  66 }
  67
  68 int parse_oid_hex(const char *hex, struct object_id *oid, const char **end)
  69 {
  70         int ret = get_oid_hex(hex, oid);
  71         if (!ret)
  72                 *end = hex + GIT_SHA1_HEXSZ;
  73         return ret;
  74 }
  75
  76 char *sha1_to_hex_r(char *buffer, const unsigned char *sha1)
  77 {
  78         static const char hex[] = "0123456789abcdef";
  79         char *buf = buffer;
  80         int i;
  81
  82         for (i = 0; i < GIT_SHA1_RAWSZ; i++) {
  83                 unsigned int val = *sha1++;
  84                 *buf++ = hex[val >> 4];
  85                 *buf++ = hex[val & 0xf];
  86         }
  87         *buf = '\0';
  88
  89         return buffer;
  90 }
  91
  92 char *oid_to_hex_r(char *buffer, const struct object_id *oid)
  93 {
  94         return sha1_to_hex_r(buffer, oid->hash);
  95 }
  96
  97 char *sha1_to_hex(const unsigned char *sha1)
  98 {
  99         static int bufno;
 100         static char hexbuffer[4][GIT_MAX_HEXSZ + 1];
 101         bufno = (bufno + 1) % ARRAY_SIZE(hexbuffer);
 102         return sha1_to_hex_r(hexbuffer[bufno], sha1);
 103 }
 104
 105 char *oid_to_hex(const struct object_id *oid)
 106 {
 107         return sha1_to_hex(oid->hash);
 108 }