1 files changed, 56 insertions, 0 deletions
diff --git a/t/helper/test-sha1.c b/t/helper/test-sha1.c
new file mode 100644
index 0000000000..a1c13f54ec
--- /dev/null
+++ b/t/helper/test-sha1.c
@@ -0,0 +1,56 @@
+#include "cache.h"
+
+int cmd_main(int ac, const char **av)
+{
+	git_SHA_CTX ctx;
+	unsigned char sha1[20];
+	unsigned bufsz = 8192;
+	int binary = 0;
+	char *buffer;
+
+	if (ac == 2) {
+		if (!strcmp(av[1], "-b"))
+			binary = 1;
+		else
+			bufsz = strtoul(av[1], NULL, 10) * 1024 * 1024;
+	}
+
+	if (!bufsz)
+		bufsz = 8192;
+
+	while ((buffer = malloc(bufsz)) == NULL) {
+		fprintf(stderr, "bufsz %u is too big, halving...\n", bufsz);
+		bufsz /= 2;
+		if (bufsz < 1024)
+			die("OOPS");
+	}
+
+	git_SHA1_Init(&ctx);
+
+	while (1) {
+		ssize_t sz, this_sz;
+		char *cp = buffer;
+		unsigned room = bufsz;
+		this_sz = 0;
+		while (room) {
+			sz = xread(0, cp, room);
+			if (sz == 0)
+				break;
+			if (sz < 0)
+				die_errno("test-sha1");
+			this_sz += sz;
+			cp += sz;
+			room -= sz;
+		}
+		if (this_sz == 0)
+			break;
+		git_SHA1_Update(&ctx, buffer, this_sz);
+	}
+	git_SHA1_Final(sha1, &ctx);
+
+	if (binary)
+		fwrite(sha1, 1, 20, stdout);
+	else
+		puts(sha1_to_hex(sha1));
+	exit(0);
+}