sha1-array.c

   1 #include "cache.h"
   2 #include "sha1-array.h"
   3 #include "sha1-lookup.h"
   4
   5 void sha1_array_append(struct sha1_array *array, const unsigned char *sha1)
   6 {
   7         ALLOC_GROW(array->sha1, array->nr + 1, array->alloc);
   8         hashcpy(array->sha1[array->nr++], sha1);
   9         array->sorted = 0;
  10 }
  11
  12 static int void_hashcmp(const void *a, const void *b)
  13 {
  14         return hashcmp(a, b);
  15 }
  16
  17 static void sha1_array_sort(struct sha1_array *array)
  18 {
  19         qsort(array->sha1, array->nr, sizeof(*array->sha1), void_hashcmp);
  20         array->sorted = 1;
  21 }
  22
  23 static const unsigned char *sha1_access(size_t index, void *table)
  24 {
  25         unsigned char (*array)[20] = table;
  26         return array[index];
  27 }
  28
  29 int sha1_array_lookup(struct sha1_array *array, const unsigned char *sha1)
  30 {
  31         if (!array->sorted)
  32                 sha1_array_sort(array);
  33         return sha1_pos(sha1, array->sha1, array->nr, sha1_access);
  34 }
  35
  36 void sha1_array_clear(struct sha1_array *array)
  37 {
  38         free(array->sha1);
  39         array->sha1 = NULL;
  40         array->nr = 0;
  41         array->alloc = 0;
  42         array->sorted = 0;
  43 }
  44
  45 int sha1_array_for_each_unique(struct sha1_array *array,
  46                                 for_each_sha1_fn fn,
  47                                 void *data)
  48 {
  49         int i;
  50
  51         if (!array->sorted)
  52                 sha1_array_sort(array);
  53
  54         for (i = 0; i < array->nr; i++) {
  55                 int ret;
  56                 if (i > 0 && !hashcmp(array->sha1[i], array->sha1[i-1]))
  57                         continue;
  58                 ret = fn(array->sha1[i], data);
  59                 if (ret)
  60                         return ret;
  61         }
  62         return 0;
  63 }