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-rw-r--r--sha1-array.c59
1 files changed, 59 insertions, 0 deletions
diff --git a/sha1-array.c b/sha1-array.c
new file mode 100644
index 0000000000..b2f47f98fb
--- /dev/null
+++ b/sha1-array.c
@@ -0,0 +1,59 @@
+#include "cache.h"
+#include "sha1-array.h"
+#include "sha1-lookup.h"
+
+void sha1_array_append(struct sha1_array *array, const unsigned char *sha1)
+{
+ ALLOC_GROW(array->sha1, array->nr + 1, array->alloc);
+ hashcpy(array->sha1[array->nr++], sha1);
+ array->sorted = 0;
+}
+
+static int void_hashcmp(const void *a, const void *b)
+{
+ return hashcmp(a, b);
+}
+
+void sha1_array_sort(struct sha1_array *array)
+{
+ qsort(array->sha1, array->nr, sizeof(*array->sha1), void_hashcmp);
+ array->sorted = 1;
+}
+
+static const unsigned char *sha1_access(size_t index, void *table)
+{
+ unsigned char (*array)[20] = table;
+ return array[index];
+}
+
+int sha1_array_lookup(struct sha1_array *array, const unsigned char *sha1)
+{
+ if (!array->sorted)
+ sha1_array_sort(array);
+ return sha1_pos(sha1, array->sha1, array->nr, sha1_access);
+}
+
+void sha1_array_clear(struct sha1_array *array)
+{
+ free(array->sha1);
+ array->sha1 = NULL;
+ array->nr = 0;
+ array->alloc = 0;
+ array->sorted = 0;
+}
+
+void sha1_array_for_each_unique(struct sha1_array *array,
+ for_each_sha1_fn fn,
+ void *data)
+{
+ int i;
+
+ if (!array->sorted)
+ sha1_array_sort(array);
+
+ for (i = 0; i < array->nr; i++) {
+ if (i > 0 && !hashcmp(array->sha1[i], array->sha1[i-1]))
+ continue;
+ fn(array->sha1[i], data);
+ }
+}