sha1-array.c

   1 #include "cache.h"
   2 #include "sha1-array.h"
   3 #include "sha1-lookup.h"
   4
   5 void oid_array_append(struct oid_array *array, const struct object_id *oid)
   6 {
   7         ALLOC_GROW(array->oid, array->nr + 1, array->alloc);
   8         oidcpy(&array->oid[array->nr++], oid);
   9         array->sorted = 0;
  10 }
  11
  12 static int void_hashcmp(const void *a, const void *b)
  13 {
  14         return oidcmp(a, b);
  15 }
  16
  17 static void oid_array_sort(struct oid_array *array)
  18 {
  19         QSORT(array->oid, array->nr, void_hashcmp);
  20         array->sorted = 1;
  21 }
  22
  23 static const unsigned char *sha1_access(size_t index, void *table)
  24 {
  25         struct object_id *array = table;
  26         return array[index].hash;
  27 }
  28
  29 int oid_array_lookup(struct oid_array *array, const struct object_id *oid)
  30 {
  31         if (!array->sorted)
  32                 oid_array_sort(array);
  33         return sha1_pos(oid->hash, array->oid, array->nr, sha1_access);
  34 }
  35
  36 void oid_array_clear(struct oid_array *array)
  37 {
  38         FREE_AND_NULL(array->oid);
  39         array->nr = 0;
  40         array->alloc = 0;
  41         array->sorted = 0;
  42 }
  43
  44
  45 int oid_array_for_each(struct oid_array *array,
  46                        for_each_oid_fn fn,
  47                        void *data)
  48 {
  49         int i;
  50
  51         /* No oid_array_sort() here! See the api-oid-array.txt docs! */
  52
  53         for (i = 0; i < array->nr; i++) {
  54                 int ret = fn(array->oid + i, data);
  55                 if (ret)
  56                         return ret;
  57         }
  58         return 0;
  59 }
  60
  61 int oid_array_for_each_unique(struct oid_array *array,
  62                               for_each_oid_fn fn,
  63                               void *data)
  64 {
  65         int i;
  66
  67         if (!array->sorted)
  68                 oid_array_sort(array);
  69
  70         for (i = 0; i < array->nr; i++) {
  71                 int ret;
  72                 if (i > 0 && oideq(array->oid + i, array->oid + i - 1))
  73                         continue;
  74                 ret = fn(array->oid + i, data);
  75                 if (ret)
  76                         return ret;
  77         }
  78         return 0;
  79 }
  80
  81 void oid_array_filter(struct oid_array *array,
  82                       for_each_oid_fn want,
  83                       void *cb_data)
  84 {
  85         unsigned nr = array->nr, src, dst;
  86         struct object_id *oids = array->oid;
  87
  88         for (src = dst = 0; src < nr; src++) {
  89                 if (want(&oids[src], cb_data)) {
  90                         if (src != dst)
  91                                 oidcpy(&oids[dst], &oids[src]);
  92                         dst++;
  93                 }
  94         }
  95         array->nr = dst;
  96 }