src/oid.h

   1 /*
   2  * Copyright (C) the libgit2 contributors. All rights reserved.
   3  *
   4  * This file is part of libgit2, distributed under the GNU GPL v2 with
   5  * a Linking Exception. For full terms see the included COPYING file.
   6  */
   7 #ifndef INCLUDE_oid_h__
   8 #define INCLUDE_oid_h__
   9
  10 #include "common.h"
  11
  12 #include "git2/oid.h"
  13
  14 /**
  15  * Format a git_oid into a newly allocated c-string.
  16  *
  17  * The c-string is owned by the caller and needs to be manually freed.
  18  *
  19  * @param id the oid structure to format
  20  * @return the c-string; NULL if memory is exhausted. Caller must
  21  *                      deallocate the string with git__free().
  22  */
  23 char *git_oid_allocfmt(const git_oid *id);
  24
  25 GIT_INLINE(int) git_oid__hashcmp(const unsigned char *sha1, const unsigned char *sha2)
  26 {
  27         return memcmp(sha1, sha2, GIT_OID_RAWSZ);
  28 }
  29
  30 /*
  31  * Compare two oid structures.
  32  *
  33  * @param a first oid structure.
  34  * @param b second oid structure.
  35  * @return <0, 0, >0 if a < b, a == b, a > b.
  36  */
  37 GIT_INLINE(int) git_oid__cmp(const git_oid *a, const git_oid *b)
  38 {
  39         return git_oid__hashcmp(a->id, b->id);
  40 }
  41
  42 GIT_INLINE(void) git_oid__cpy_prefix(
  43         git_oid *out, const git_oid *id, size_t len)
  44 {
  45         memcpy(&out->id, id->id, (len + 1) / 2);
  46
  47         if (len & 1)
  48                 out->id[len / 2] &= 0xF0;
  49 }
  50
  51 #endif