1 files changed, 56 insertions, 0 deletions
diff --git a/t/helper/test-delta.c b/t/helper/test-delta.c
new file mode 100644
index 0000000000..52ea00c937
--- /dev/null
+++ b/t/helper/test-delta.c
@@ -0,0 +1,56 @@
+/*
+ * test-delta.c: test code to exercise diff-delta.c and patch-delta.c
+ *
+ * (C) 2005 Nicolas Pitre <nico@fluxnic.net>
+ *
+ * This code is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "test-tool.h"
+#include "git-compat-util.h"
+#include "delta.h"
+#include "strbuf.h"
+
+static const char usage_str[] =
+	"test-tool delta (-d|-p) <from_file> <data_file> <out_file>";
+
+int cmd__delta(int argc, const char **argv)
+{
+	int fd;
+	struct strbuf from = STRBUF_INIT, data = STRBUF_INIT;
+	char *out_buf;
+	unsigned long out_size;
+
+	if (argc != 5 || (strcmp(argv[1], "-d") && strcmp(argv[1], "-p")))
+		usage(usage_str);
+
+	if (strbuf_read_file(&from, argv[2], 0) < 0)
+		die_errno("unable to read '%s'", argv[2]);
+	if (strbuf_read_file(&data, argv[3], 0) < 0)
+		die_errno("unable to read '%s'", argv[3]);
+
+	if (argv[1][1] == 'd')
+		out_buf = diff_delta(from.buf, from.len,
+				     data.buf, data.len,
+				     &out_size, 0);
+	else
+		out_buf = patch_delta(from.buf, from.len,
+				      data.buf, data.len,
+				      &out_size);
+	if (!out_buf)
+		die("delta operation failed (returned NULL)");
+
+	fd = xopen(argv[4], O_WRONLY|O_CREAT|O_TRUNC, 0666);
+	if (write_in_full(fd, out_buf, out_size) < 0)
+		die_errno("write(%s)", argv[4]);
+	if (close(fd) < 0)
+		die_errno("close(%s)", argv[4]);
+
+	strbuf_release(&from);
+	strbuf_release(&data);
+	free(out_buf);
+
+	return 0;
+}