diff options
Diffstat (limited to 'hex.c')
| -rw-r--r-- | hex.c | 155 |
1 files changed, 155 insertions, 0 deletions
@@ -0,0 +1,155 @@ +#include "cache.h" + +const signed char hexval_table[256] = { + -1, -1, -1, -1, -1, -1, -1, -1, /* 00-07 */ + -1, -1, -1, -1, -1, -1, -1, -1, /* 08-0f */ + -1, -1, -1, -1, -1, -1, -1, -1, /* 10-17 */ + -1, -1, -1, -1, -1, -1, -1, -1, /* 18-1f */ + -1, -1, -1, -1, -1, -1, -1, -1, /* 20-27 */ + -1, -1, -1, -1, -1, -1, -1, -1, /* 28-2f */ + 0, 1, 2, 3, 4, 5, 6, 7, /* 30-37 */ + 8, 9, -1, -1, -1, -1, -1, -1, /* 38-3f */ + -1, 10, 11, 12, 13, 14, 15, -1, /* 40-47 */ + -1, -1, -1, -1, -1, -1, -1, -1, /* 48-4f */ + -1, -1, -1, -1, -1, -1, -1, -1, /* 50-57 */ + -1, -1, -1, -1, -1, -1, -1, -1, /* 58-5f */ + -1, 10, 11, 12, 13, 14, 15, -1, /* 60-67 */ + -1, -1, -1, -1, -1, -1, -1, -1, /* 68-67 */ + -1, -1, -1, -1, -1, -1, -1, -1, /* 70-77 */ + -1, -1, -1, -1, -1, -1, -1, -1, /* 78-7f */ + -1, -1, -1, -1, -1, -1, -1, -1, /* 80-87 */ + -1, -1, -1, -1, -1, -1, -1, -1, /* 88-8f */ + -1, -1, -1, -1, -1, -1, -1, -1, /* 90-97 */ + -1, -1, -1, -1, -1, -1, -1, -1, /* 98-9f */ + -1, -1, -1, -1, -1, -1, -1, -1, /* a0-a7 */ + -1, -1, -1, -1, -1, -1, -1, -1, /* a8-af */ + -1, -1, -1, -1, -1, -1, -1, -1, /* b0-b7 */ + -1, -1, -1, -1, -1, -1, -1, -1, /* b8-bf */ + -1, -1, -1, -1, -1, -1, -1, -1, /* c0-c7 */ + -1, -1, -1, -1, -1, -1, -1, -1, /* c8-cf */ + -1, -1, -1, -1, -1, -1, -1, -1, /* d0-d7 */ + -1, -1, -1, -1, -1, -1, -1, -1, /* d8-df */ + -1, -1, -1, -1, -1, -1, -1, -1, /* e0-e7 */ + -1, -1, -1, -1, -1, -1, -1, -1, /* e8-ef */ + -1, -1, -1, -1, -1, -1, -1, -1, /* f0-f7 */ + -1, -1, -1, -1, -1, -1, -1, -1, /* f8-ff */ +}; + +int hex_to_bytes(unsigned char *binary, const char *hex, size_t len) +{ + for (; len; len--, hex += 2) { + unsigned int val = (hexval(hex[0]) << 4) | hexval(hex[1]); + + if (val & ~0xff) + return -1; + *binary++ = val; + } + return 0; +} + +static int get_hash_hex_algop(const char *hex, unsigned char *hash, + const struct git_hash_algo *algop) +{ + int i; + for (i = 0; i < algop->rawsz; i++) { + int val = hex2chr(hex); + if (val < 0) + return -1; + *hash++ = val; + hex += 2; + } + return 0; +} + +int get_sha1_hex(const char *hex, unsigned char *sha1) +{ + return get_hash_hex_algop(hex, sha1, the_hash_algo); +} + +int get_oid_hex_algop(const char *hex, struct object_id *oid, + const struct git_hash_algo *algop) +{ + return get_hash_hex_algop(hex, oid->hash, algop); +} + +/* + * NOTE: This function relies on hash algorithms being in order from shortest + * length to longest length. + */ +int get_oid_hex_any(const char *hex, struct object_id *oid) +{ + int i; + for (i = GIT_HASH_NALGOS - 1; i > 0; i--) { + if (!get_hash_hex_algop(hex, oid->hash, &hash_algos[i])) + return i; + } + return GIT_HASH_UNKNOWN; +} + +int get_oid_hex(const char *hex, struct object_id *oid) +{ + return get_oid_hex_algop(hex, oid, the_hash_algo); +} + +int parse_oid_hex_algop(const char *hex, struct object_id *oid, + const char **end, + const struct git_hash_algo *algop) +{ + int ret = get_hash_hex_algop(hex, oid->hash, algop); + if (!ret) + *end = hex + algop->hexsz; + return ret; +} + +int parse_oid_hex_any(const char *hex, struct object_id *oid, const char **end) +{ + int ret = get_oid_hex_any(hex, oid); + if (ret) + *end = hex + hash_algos[ret].hexsz; + return ret; +} + +int parse_oid_hex(const char *hex, struct object_id *oid, const char **end) +{ + return parse_oid_hex_algop(hex, oid, end, the_hash_algo); +} + +char *hash_to_hex_algop_r(char *buffer, const unsigned char *hash, + const struct git_hash_algo *algop) +{ + static const char hex[] = "0123456789abcdef"; + char *buf = buffer; + int i; + + for (i = 0; i < algop->rawsz; i++) { + unsigned int val = *hash++; + *buf++ = hex[val >> 4]; + *buf++ = hex[val & 0xf]; + } + *buf = '\0'; + + return buffer; +} + +char *oid_to_hex_r(char *buffer, const struct object_id *oid) +{ + return hash_to_hex_algop_r(buffer, oid->hash, the_hash_algo); +} + +char *hash_to_hex_algop(const unsigned char *hash, const struct git_hash_algo *algop) +{ + static int bufno; + static char hexbuffer[4][GIT_MAX_HEXSZ + 1]; + bufno = (bufno + 1) % ARRAY_SIZE(hexbuffer); + return hash_to_hex_algop_r(hexbuffer[bufno], hash, algop); +} + +char *hash_to_hex(const unsigned char *hash) +{ + return hash_to_hex_algop(hash, the_hash_algo); +} + +char *oid_to_hex(const struct object_id *oid) +{ + return hash_to_hex_algop(oid->hash, the_hash_algo); +} |