From c8bae7493d2f2910b57f13ded012e86bdcfb0532 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 7 Apr 2024 16:47:53 +0200
Subject: Adding upstream version 1:2.39.2.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 t/helper/test-delta.c | 86 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 86 insertions(+)
 create mode 100644 t/helper/test-delta.c

(limited to 't/helper/test-delta.c')

diff --git a/t/helper/test-delta.c b/t/helper/test-delta.c
new file mode 100644
index 0000000..b15481e
--- /dev/null
+++ b/t/helper/test-delta.c
@@ -0,0 +1,86 @@
+/*
+ * 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 "cache.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 stat st;
+	void *from_buf = NULL, *data_buf = NULL, *out_buf = NULL;
+	unsigned long from_size, data_size, out_size;
+	int ret = 1;
+
+	if (argc != 5 || (strcmp(argv[1], "-d") && strcmp(argv[1], "-p"))) {
+		fprintf(stderr, "usage: %s\n", usage_str);
+		return 1;
+	}
+
+	fd = open(argv[2], O_RDONLY);
+	if (fd < 0 || fstat(fd, &st)) {
+		perror(argv[2]);
+		return 1;
+	}
+	from_size = st.st_size;
+	from_buf = xmalloc(from_size);
+	if (read_in_full(fd, from_buf, from_size) < 0) {
+		perror(argv[2]);
+		close(fd);
+		goto cleanup;
+	}
+	close(fd);
+
+	fd = open(argv[3], O_RDONLY);
+	if (fd < 0 || fstat(fd, &st)) {
+		perror(argv[3]);
+		goto cleanup;
+	}
+	data_size = st.st_size;
+	data_buf = xmalloc(data_size);
+	if (read_in_full(fd, data_buf, data_size) < 0) {
+		perror(argv[3]);
+		close(fd);
+		goto cleanup;
+	}
+	close(fd);
+
+	if (argv[1][1] == 'd')
+		out_buf = diff_delta(from_buf, from_size,
+				     data_buf, data_size,
+				     &out_size, 0);
+	else
+		out_buf = patch_delta(from_buf, from_size,
+				      data_buf, data_size,
+				      &out_size);
+	if (!out_buf) {
+		fprintf(stderr, "delta operation failed (returned NULL)\n");
+		goto cleanup;
+	}
+
+	fd = open (argv[4], O_WRONLY|O_CREAT|O_TRUNC, 0666);
+	if (fd < 0 || write_in_full(fd, out_buf, out_size) < 0) {
+		perror(argv[4]);
+		goto cleanup;
+	}
+
+	ret = 0;
+cleanup:
+	free(from_buf);
+	free(data_buf);
+	free(out_buf);
+
+	return ret;
+}
-- 
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