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-rw-r--r--diffcore-delta.c43
1 files changed, 43 insertions, 0 deletions
diff --git a/diffcore-delta.c b/diffcore-delta.c
new file mode 100644
index 0000000000..1e6a6911ec
--- /dev/null
+++ b/diffcore-delta.c
@@ -0,0 +1,43 @@
+#include "cache.h"
+#include "diff.h"
+#include "diffcore.h"
+#include "delta.h"
+#include "count-delta.h"
+
+static int diffcore_count_changes_1(void *src, unsigned long src_size,
+ void *dst, unsigned long dst_size,
+ unsigned long delta_limit,
+ unsigned long *src_copied,
+ unsigned long *literal_added)
+{
+ void *delta;
+ unsigned long delta_size;
+
+ delta = diff_delta(src, src_size,
+ dst, dst_size,
+ &delta_size, delta_limit);
+ if (!delta)
+ /* If delta_limit is exceeded, we have too much differences */
+ return -1;
+
+ /* Estimate the edit size by interpreting delta. */
+ if (count_delta(delta, delta_size, src_copied, literal_added)) {
+ free(delta);
+ return -1;
+ }
+ free(delta);
+ return 0;
+}
+
+int diffcore_count_changes(void *src, unsigned long src_size,
+ void *dst, unsigned long dst_size,
+ unsigned long delta_limit,
+ unsigned long *src_copied,
+ unsigned long *literal_added)
+{
+ return diffcore_count_changes_1(src, src_size,
+ dst, dst_size,
+ delta_limit,
+ src_copied,
+ literal_added);
+}