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-rw-r--r--t/helper/test-sha1.c56
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);
+}