32 lines
1.3 KiB
32 lines
1.3 KiB
#ifndef SHA1_LOOKUP_H |
|
#define SHA1_LOOKUP_H |
|
|
|
typedef const unsigned char *sha1_access_fn(size_t index, void *table); |
|
|
|
extern int sha1_pos(const unsigned char *sha1, |
|
void *table, |
|
size_t nr, |
|
sha1_access_fn fn); |
|
|
|
/* |
|
* Searches for sha1 in table, using the given fanout table to determine the |
|
* interval to search, then using binary search. Returns 1 if found, 0 if not. |
|
* |
|
* Takes the following parameters: |
|
* |
|
* - sha1: the hash to search for |
|
* - fanout_nbo: a 256-element array of NETWORK-order 32-bit integers; the |
|
* integer at position i represents the number of elements in table whose |
|
* first byte is less than or equal to i |
|
* - table: a sorted list of hashes with optional extra information in between |
|
* - stride: distance between two consecutive elements in table (should be |
|
* GIT_MAX_RAWSZ or greater) |
|
* - result: if not NULL, this function stores the element index of the |
|
* position found (if the search is successful) or the index of the least |
|
* element that is greater than sha1 (if the search is not successful) |
|
* |
|
* This function does not verify the validity of the fanout table. |
|
*/ |
|
int bsearch_hash(const unsigned char *sha1, const uint32_t *fanout_nbo, |
|
const unsigned char *table, size_t stride, uint32_t *result); |
|
#endif
|
|
|