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[thirdparty/git.git] / 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 static int get_hash_hex_algop(const char *hex, unsigned char *hash,
51 const struct git_hash_algo *algop)
52 {
53 int i;
54 for (i = 0; i < algop->rawsz; i++) {
55 int val = hex2chr(hex);
56 if (val < 0)
57 return -1;
58 *hash++ = val;
59 hex += 2;
60 }
61 return 0;
62 }
63
64 int get_sha1_hex(const char *hex, unsigned char *sha1)
65 {
66 return get_hash_hex_algop(hex, sha1, the_hash_algo);
67 }
68
69 int get_oid_hex_algop(const char *hex, struct object_id *oid,
70 const struct git_hash_algo *algop)
71 {
72 return get_hash_hex_algop(hex, oid->hash, algop);
73 }
74
75 /*
76 * NOTE: This function relies on hash algorithms being in order from shortest
77 * length to longest length.
78 */
79 int get_oid_hex_any(const char *hex, struct object_id *oid)
80 {
81 int i;
82 for (i = GIT_HASH_NALGOS - 1; i > 0; i--) {
83 if (!get_hash_hex_algop(hex, oid->hash, &hash_algos[i]))
84 return i;
85 }
86 return GIT_HASH_UNKNOWN;
87 }
88
89 int get_oid_hex(const char *hex, struct object_id *oid)
90 {
91 return get_oid_hex_algop(hex, oid, the_hash_algo);
92 }
93
94 int parse_oid_hex_algop(const char *hex, struct object_id *oid,
95 const char **end,
96 const struct git_hash_algo *algop)
97 {
98 int ret = get_hash_hex_algop(hex, oid->hash, algop);
99 if (!ret)
100 *end = hex + algop->hexsz;
101 return ret;
102 }
103
104 int parse_oid_hex_any(const char *hex, struct object_id *oid, const char **end)
105 {
106 int ret = get_oid_hex_any(hex, oid);
107 if (ret)
108 *end = hex + hash_algos[ret].hexsz;
109 return ret;
110 }
111
112 int parse_oid_hex(const char *hex, struct object_id *oid, const char **end)
113 {
114 return parse_oid_hex_algop(hex, oid, end, the_hash_algo);
115 }
116
117 char *hash_to_hex_algop_r(char *buffer, const unsigned char *hash,
118 const struct git_hash_algo *algop)
119 {
120 static const char hex[] = "0123456789abcdef";
121 char *buf = buffer;
122 int i;
123
124 for (i = 0; i < algop->rawsz; i++) {
125 unsigned int val = *hash++;
126 *buf++ = hex[val >> 4];
127 *buf++ = hex[val & 0xf];
128 }
129 *buf = '\0';
130
131 return buffer;
132 }
133
134 char *oid_to_hex_r(char *buffer, const struct object_id *oid)
135 {
136 return hash_to_hex_algop_r(buffer, oid->hash, the_hash_algo);
137 }
138
139 char *hash_to_hex_algop(const unsigned char *hash, const struct git_hash_algo *algop)
140 {
141 static int bufno;
142 static char hexbuffer[4][GIT_MAX_HEXSZ + 1];
143 bufno = (bufno + 1) % ARRAY_SIZE(hexbuffer);
144 return hash_to_hex_algop_r(hexbuffer[bufno], hash, algop);
145 }
146
147 char *hash_to_hex(const unsigned char *hash)
148 {
149 return hash_to_hex_algop(hash, the_hash_algo);
150 }
151
152 char *oid_to_hex(const struct object_id *oid)
153 {
154 return hash_to_hex_algop(oid->hash, the_hash_algo);
155 }