t/helper/test-sha1: prepare for an unsafe mode

With the new "unsafe" SHA-1 build knob, it would be convenient to have
a test-tool that can exercise Git's unsafe SHA-1 wrappers for testing,
similar to 't/helper/test-tool sha1'.

Prepare for such a helper by altering the implementation of that
test-tool (in cmd_hash_impl(), which is generic and parameterized over
different hash functions) to conditionally run the unsafe variants of
the chosen hash function.

The following commit will add a new test-tool which makes use of this
new parameter.

Signed-off-by: Taylor Blau <[email protected]>
base-commit: d8c1fc7
Signed-off-by: Junio C Hamano <[email protected]>

Author: ttaylorr

t/helper/test-hash.c

@@ -1,7 +1,7 @@
 #include "test-tool.h"
 #include "hex.h"
 
-int cmd_hash_impl(int ac, const char **av, int algo)
+int cmd_hash_impl(int ac, const char **av, int algo, int unsafe)
 {
 	git_hash_ctx ctx;
 	unsigned char hash[GIT_MAX_HEXSZ];
@@ -27,7 +27,10 @@ int cmd_hash_impl(int ac, const char **av, int algo)
 			die("OOPS");
 	}
 
-	algop->init_fn(&ctx);
+	if (unsafe)
+		algop->unsafe_init_fn(&ctx);
+	else
+		algop->init_fn(&ctx);
 
 	while (1) {
 		ssize_t sz, this_sz;
@@ -46,9 +49,15 @@ int cmd_hash_impl(int ac, const char **av, int algo)
 		}
 		if (this_sz == 0)
 			break;
-		algop->update_fn(&ctx, buffer, this_sz);
+		if (unsafe)
+			algop->unsafe_update_fn(&ctx, buffer, this_sz);
+		else
+			algop->update_fn(&ctx, buffer, this_sz);
 	}
-	algop->final_fn(hash, &ctx);
+	if (unsafe)
+		algop->unsafe_final_fn(hash, &ctx);
+	else
+		algop->final_fn(hash, &ctx);
 
 	if (binary)
 		fwrite(hash, 1, algop->rawsz, stdout);

t/helper/test-sha1.c

@@ -3,7 +3,7 @@
 
 int cmd__sha1(int ac, const char **av)
 {
-	return cmd_hash_impl(ac, av, GIT_HASH_SHA1);
+	return cmd_hash_impl(ac, av, GIT_HASH_SHA1, 0);
 }
 
 int cmd__sha1_is_sha1dc(int argc UNUSED, const char **argv UNUSED)

t/helper/test-sha256.c

@@ -3,5 +3,5 @@
 
 int cmd__sha256(int ac, const char **av)
 {
-	return cmd_hash_impl(ac, av, GIT_HASH_SHA256);
+	return cmd_hash_impl(ac, av, GIT_HASH_SHA256, 0);
 }

t/helper/test-tool.h

@@ -81,6 +81,6 @@ int cmd__windows_named_pipe(int argc, const char **argv);
 #endif
 int cmd__write_cache(int argc, const char **argv);
 
-int cmd_hash_impl(int ac, const char **av, int algo);
+int cmd_hash_impl(int ac, const char **av, int algo, int unsafe);
 
 #endif