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61e2a70ff2
There are some places where we need to parse a hex object ID in any algorithm without knowing beforehand which algorithm is in use. An example is when parsing fast-import marks. Add a get_oid_hex_any to parse an object ID and return the algorithm it belongs to, and additionally add parse_oid_hex_any which is the equivalent change for parse_oid_hex. If the object is not parseable, we return GIT_HASH_UNKNOWN. Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
155 lines
4.2 KiB
C
155 lines
4.2 KiB
C
#include "cache.h"
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const signed char hexval_table[256] = {
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-1, -1, -1, -1, -1, -1, -1, -1, /* 00-07 */
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-1, -1, -1, -1, -1, -1, -1, -1, /* 08-0f */
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-1, -1, -1, -1, -1, -1, -1, -1, /* 10-17 */
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-1, -1, -1, -1, -1, -1, -1, -1, /* 18-1f */
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-1, -1, -1, -1, -1, -1, -1, -1, /* 20-27 */
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-1, -1, -1, -1, -1, -1, -1, -1, /* 28-2f */
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0, 1, 2, 3, 4, 5, 6, 7, /* 30-37 */
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8, 9, -1, -1, -1, -1, -1, -1, /* 38-3f */
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-1, 10, 11, 12, 13, 14, 15, -1, /* 40-47 */
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-1, -1, -1, -1, -1, -1, -1, -1, /* 48-4f */
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-1, -1, -1, -1, -1, -1, -1, -1, /* 50-57 */
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-1, -1, -1, -1, -1, -1, -1, -1, /* 58-5f */
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-1, 10, 11, 12, 13, 14, 15, -1, /* 60-67 */
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-1, -1, -1, -1, -1, -1, -1, -1, /* 68-67 */
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-1, -1, -1, -1, -1, -1, -1, -1, /* 70-77 */
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-1, -1, -1, -1, -1, -1, -1, -1, /* 78-7f */
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-1, -1, -1, -1, -1, -1, -1, -1, /* 80-87 */
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-1, -1, -1, -1, -1, -1, -1, -1, /* 88-8f */
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-1, -1, -1, -1, -1, -1, -1, -1, /* 90-97 */
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-1, -1, -1, -1, -1, -1, -1, -1, /* 98-9f */
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-1, -1, -1, -1, -1, -1, -1, -1, /* a0-a7 */
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-1, -1, -1, -1, -1, -1, -1, -1, /* a8-af */
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-1, -1, -1, -1, -1, -1, -1, -1, /* b0-b7 */
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-1, -1, -1, -1, -1, -1, -1, -1, /* b8-bf */
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-1, -1, -1, -1, -1, -1, -1, -1, /* c0-c7 */
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-1, -1, -1, -1, -1, -1, -1, -1, /* c8-cf */
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-1, -1, -1, -1, -1, -1, -1, -1, /* d0-d7 */
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-1, -1, -1, -1, -1, -1, -1, -1, /* d8-df */
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-1, -1, -1, -1, -1, -1, -1, -1, /* e0-e7 */
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-1, -1, -1, -1, -1, -1, -1, -1, /* e8-ef */
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-1, -1, -1, -1, -1, -1, -1, -1, /* f0-f7 */
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-1, -1, -1, -1, -1, -1, -1, -1, /* f8-ff */
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};
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int hex_to_bytes(unsigned char *binary, const char *hex, size_t len)
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{
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for (; len; len--, hex += 2) {
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unsigned int val = (hexval(hex[0]) << 4) | hexval(hex[1]);
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if (val & ~0xff)
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return -1;
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*binary++ = val;
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}
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return 0;
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}
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static int get_hash_hex_algop(const char *hex, unsigned char *hash,
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const struct git_hash_algo *algop)
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{
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int i;
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for (i = 0; i < algop->rawsz; i++) {
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int val = hex2chr(hex);
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if (val < 0)
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return -1;
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*hash++ = val;
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hex += 2;
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}
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return 0;
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}
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int get_sha1_hex(const char *hex, unsigned char *sha1)
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{
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return get_hash_hex_algop(hex, sha1, the_hash_algo);
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}
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int get_oid_hex_algop(const char *hex, struct object_id *oid,
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const struct git_hash_algo *algop)
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{
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return get_hash_hex_algop(hex, oid->hash, algop);
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}
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/*
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* NOTE: This function relies on hash algorithms being in order from shortest
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* length to longest length.
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*/
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int get_oid_hex_any(const char *hex, struct object_id *oid)
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{
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int i;
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for (i = GIT_HASH_NALGOS - 1; i > 0; i--) {
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if (!get_hash_hex_algop(hex, oid->hash, &hash_algos[i]))
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return i;
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}
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return GIT_HASH_UNKNOWN;
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}
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int get_oid_hex(const char *hex, struct object_id *oid)
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{
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return get_oid_hex_algop(hex, oid, the_hash_algo);
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}
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int parse_oid_hex_algop(const char *hex, struct object_id *oid,
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const char **end,
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const struct git_hash_algo *algop)
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{
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int ret = get_hash_hex_algop(hex, oid->hash, algop);
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if (!ret)
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*end = hex + algop->hexsz;
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return ret;
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}
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int parse_oid_hex_any(const char *hex, struct object_id *oid, const char **end)
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{
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int ret = get_oid_hex_any(hex, oid);
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if (ret)
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*end = hex + hash_algos[ret].hexsz;
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return ret;
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}
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int parse_oid_hex(const char *hex, struct object_id *oid, const char **end)
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{
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return parse_oid_hex_algop(hex, oid, end, the_hash_algo);
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}
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char *hash_to_hex_algop_r(char *buffer, const unsigned char *hash,
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const struct git_hash_algo *algop)
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{
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static const char hex[] = "0123456789abcdef";
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char *buf = buffer;
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int i;
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for (i = 0; i < algop->rawsz; i++) {
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unsigned int val = *hash++;
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*buf++ = hex[val >> 4];
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*buf++ = hex[val & 0xf];
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}
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*buf = '\0';
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return buffer;
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}
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char *oid_to_hex_r(char *buffer, const struct object_id *oid)
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{
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return hash_to_hex_algop_r(buffer, oid->hash, the_hash_algo);
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}
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char *hash_to_hex_algop(const unsigned char *hash, const struct git_hash_algo *algop)
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{
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static int bufno;
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static char hexbuffer[4][GIT_MAX_HEXSZ + 1];
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bufno = (bufno + 1) % ARRAY_SIZE(hexbuffer);
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return hash_to_hex_algop_r(hexbuffer[bufno], hash, algop);
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}
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char *hash_to_hex(const unsigned char *hash)
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{
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return hash_to_hex_algop(hash, the_hash_algo);
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}
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char *oid_to_hex(const struct object_id *oid)
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{
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return hash_to_hex_algop(oid->hash, the_hash_algo);
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}
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