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/*
* Copyright (C) the libgit2 contributors. All rights reserved.
*
* This file is part of libgit2, distributed under the GNU GPL v2 with
* a Linking Exception. For full terms see the included COPYING file.
*/
#ifndef INCLUDE_oid_h__
#define INCLUDE_oid_h__
#include "common.h"
#include "git2/oid.h"
extern const git_oid git_oid__empty_blob_sha1;
extern const git_oid git_oid__empty_tree_sha1;
/**
* Format a git_oid into a newly allocated c-string.
*
* The c-string is owned by the caller and needs to be manually freed.
*
* @param id the oid structure to format
* @return the c-string; NULL if memory is exhausted. Caller must
* deallocate the string with git__free().
*/
char *git_oid_allocfmt(const git_oid *id);
GIT_INLINE(int) git_oid_raw_ncmp(
const unsigned char *sha1,
const unsigned char *sha2,
size_t len)
{
if (len > GIT_OID_HEXSZ)
len = GIT_OID_HEXSZ;
while (len > 1) {
if (*sha1 != *sha2)
return 1;
sha1++;
sha2++;
len -= 2;
};
if (len)
if ((*sha1 ^ *sha2) & 0xf0)
return 1;
return 0;
}
GIT_INLINE(int) git_oid_raw_cmp(
const unsigned char *sha1,
const unsigned char *sha2)
{
return memcmp(sha1, sha2, GIT_OID_RAWSZ);
}
GIT_INLINE(int) git_oid_raw_cpy(
unsigned char *dst,
const unsigned char *src)
{
memcpy(dst, src, GIT_OID_RAWSZ);
return 0;
}
/*
* Compare two oid structures.
*
* @param a first oid structure.
* @param b second oid structure.
* @return <0, 0, >0 if a < b, a == b, a > b.
*/
GIT_INLINE(int) git_oid__cmp(const git_oid *a, const git_oid *b)
{
return git_oid_raw_cmp(a->id, b->id);
}
GIT_INLINE(void) git_oid__cpy_prefix(
git_oid *out, const git_oid *id, size_t len)
{
memcpy(&out->id, id->id, (len + 1) / 2);
if (len & 1)
out->id[len / 2] &= 0xF0;
}
GIT_INLINE(bool) git_oid__is_hexstr(const char *str)
{
size_t i;
for (i = 0; str[i] != '\0'; i++) {
if (git__fromhex(str[i]) < 0)
return false;
}
return (i == GIT_OID_HEXSZ);
}
#endif
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