| #ifndef HEX_H |
| #define HEX_H |
| |
| #include "hash-ll.h" |
| |
| extern const signed char hexval_table[256]; |
| static inline unsigned int hexval(unsigned char c) |
| { |
| return hexval_table[c]; |
| } |
| |
| /* |
| * Convert two consecutive hexadecimal digits into a char. Return a |
| * negative value on error. Don't run over the end of short strings. |
| */ |
| static inline int hex2chr(const char *s) |
| { |
| unsigned int val = hexval(s[0]); |
| return (val & ~0xf) ? val : (val << 4) | hexval(s[1]); |
| } |
| |
| /* |
| * Try to read a hash (specified by the_hash_algo) in hexadecimal |
| * format from the 40 (or whatever length the hash algorithm uses) |
| * characters starting at hex. Write the 20-byte (or the length of |
| * the hash) result to hash in binary form. |
| * Return 0 on success. Reading stops if a NUL is encountered in the |
| * input, so it is safe to pass this function an arbitrary |
| * null-terminated string. |
| */ |
| int get_hash_hex(const char *hex, unsigned char *hash); |
| int get_oid_hex(const char *hex, struct object_id *oid); |
| |
| /* Like get_oid_hex, but for an arbitrary hash algorithm. */ |
| int get_oid_hex_algop(const char *hex, struct object_id *oid, const struct git_hash_algo *algop); |
| |
| /* |
| * Read `len` pairs of hexadecimal digits from `hex` and write the |
| * values to `binary` as `len` bytes. Return 0 on success, or -1 if |
| * the input does not consist of hex digits). |
| */ |
| int hex_to_bytes(unsigned char *binary, const char *hex, size_t len); |
| |
| /* |
| * Convert a binary hash in "unsigned char []" or an object name in |
| * "struct object_id *" to its hex equivalent. The `_r` variant is reentrant, |
| * and writes the NUL-terminated output to the buffer `out`, which must be at |
| * least `GIT_MAX_HEXSZ + 1` bytes, and returns a pointer to out for |
| * convenience. |
| * |
| * The non-`_r` variant returns a static buffer, but uses a ring of 4 |
| * buffers, making it safe to make multiple calls for a single statement, like: |
| * |
| * printf("%s -> %s", hash_to_hex(one), hash_to_hex(two)); |
| * printf("%s -> %s", oid_to_hex(one), oid_to_hex(two)); |
| */ |
| char *hash_to_hex_algop_r(char *buffer, const unsigned char *hash, const struct git_hash_algo *); |
| char *oid_to_hex_r(char *out, const struct object_id *oid); |
| char *hash_to_hex_algop(const unsigned char *hash, const struct git_hash_algo *); /* static buffer result! */ |
| char *hash_to_hex(const unsigned char *hash); /* same static buffer */ |
| char *oid_to_hex(const struct object_id *oid); /* same static buffer */ |
| |
| /* |
| * Parse a 40-character hexadecimal object ID starting from hex, updating the |
| * pointer specified by end when parsing stops. The resulting object ID is |
| * stored in oid. Returns 0 on success. Parsing will stop on the first NUL or |
| * other invalid character. end is only updated on success; otherwise, it is |
| * unmodified. |
| */ |
| int parse_oid_hex(const char *hex, struct object_id *oid, const char **end); |
| |
| /* Like parse_oid_hex, but for an arbitrary hash algorithm. */ |
| int parse_oid_hex_algop(const char *hex, struct object_id *oid, const char **end, |
| const struct git_hash_algo *algo); |
| |
| |
| /* |
| * These functions work like get_oid_hex and parse_oid_hex, but they will parse |
| * a hex value for any algorithm. The algorithm is detected based on the length |
| * and the algorithm in use is returned. If this is not a hex object ID in any |
| * algorithm, returns GIT_HASH_UNKNOWN. |
| */ |
| int get_oid_hex_any(const char *hex, struct object_id *oid); |
| int parse_oid_hex_any(const char *hex, struct object_id *oid, const char **end); |
| |
| #endif |