8380dcd700
When we are looking up an oid in an array, we obviously don't need to write to the array. Let's mark it as const in the function interfaces, as well as in the local variables we use to derference the void pointer (note a few cases use pointers-to-pointers, so we mark everything const). Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
33 lines
1.3 KiB
C
33 lines
1.3 KiB
C
#ifndef HASH_LOOKUP_H
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#define HASH_LOOKUP_H
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typedef const struct object_id *oid_access_fn(size_t index, const void *table);
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int oid_pos(const struct object_id *oid,
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const void *table,
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size_t nr,
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oid_access_fn fn);
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/*
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* Searches for hash in table, using the given fanout table to determine the
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* interval to search, then using binary search. Returns 1 if found, 0 if not.
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*
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* Takes the following parameters:
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*
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* - hash: the hash to search for
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* - fanout_nbo: a 256-element array of NETWORK-order 32-bit integers; the
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* integer at position i represents the number of elements in table whose
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* first byte is less than or equal to i
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* - table: a sorted list of hashes with optional extra information in between
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* - stride: distance between two consecutive elements in table (should be
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* GIT_MAX_RAWSZ or greater)
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* - result: if not NULL, this function stores the element index of the
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* position found (if the search is successful) or the index of the least
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* element that is greater than hash (if the search is not successful)
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*
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* This function does not verify the validity of the fanout table.
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*/
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int bsearch_hash(const unsigned char *hash, const uint32_t *fanout_nbo,
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const unsigned char *table, size_t stride, uint32_t *result);
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#endif
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