Merge branch 'gt/t-hash-unit-test'

A pair of test helpers that essentially are unit tests on hash
algorithms have been rewritten using the unit-tests framework.

* gt/t-hash-unit-test:
  t/: migrate helper/test-{sha1, sha256} to unit-tests/t-hash
  strbuf: introduce strbuf_addstrings() to repeatedly add a string

Author: gitster

Makefile

@@ -1334,6 +1334,7 @@ THIRD_PARTY_SOURCES += sha1collisiondetection/%
 THIRD_PARTY_SOURCES += sha1dc/%
 
 UNIT_TEST_PROGRAMS += t-ctype
+UNIT_TEST_PROGRAMS += t-hash
 UNIT_TEST_PROGRAMS += t-mem-pool
 UNIT_TEST_PROGRAMS += t-prio-queue
 UNIT_TEST_PROGRAMS += t-reftable-basics

builtin/submodule--helper.c

@@ -256,11 +256,9 @@ static void module_list_active(struct module_list *list)
 
 static char *get_up_path(const char *path)
 {
-	int i;
 	struct strbuf sb = STRBUF_INIT;
 
-	for (i = count_slashes(path); i; i--)
-		strbuf_addstr(&sb, "../");
+	strbuf_addstrings(&sb, "../", count_slashes(path));
 
 	/*
 	 * Check if 'path' ends with slash or not

json-writer.c

@@ -46,10 +46,7 @@ static void append_quoted_string(struct strbuf *out, const char *in)
 
 static void indent_pretty(struct json_writer *jw)
 {
-	int k;
-
-	for (k = 0; k < jw->open_stack.len; k++)
-		strbuf_addstr(&jw->json, "  ");
+	strbuf_addstrings(&jw->json, "  ", jw->open_stack.len);
 }
 
 /*

strbuf.c

@@ -313,6 +313,15 @@ void strbuf_add(struct strbuf *sb, const void *data, size_t len)
 	strbuf_setlen(sb, sb->len + len);
 }
 
+void strbuf_addstrings(struct strbuf *sb, const char *s, size_t n)
+{
+	size_t len = strlen(s);
+
+	strbuf_grow(sb, st_mult(len, n));
+	for (size_t i = 0; i < n; i++)
+		strbuf_add(sb, s, len);
+}
+
 void strbuf_addbuf(struct strbuf *sb, const struct strbuf *sb2)
 {
 	strbuf_grow(sb, sb2->len);

strbuf.h

@@ -310,6 +310,11 @@ static inline void strbuf_addstr(struct strbuf *sb, const char *s)
 	strbuf_add(sb, s, strlen(s));
 }
 
+/**
+ * Add a NUL-terminated string the specified number of times to the buffer.
+ */
+void strbuf_addstrings(struct strbuf *sb, const char *s, size_t n);
+
 /**
  * Copy the contents of another buffer at the end of the current one.
  */

t/t0015-hash.sh

@@ -0,0 +1,84 @@
+#include "test-lib.h"
+#include "hex.h"
+#include "strbuf.h"
+
+static void check_hash_data(const void *data, size_t data_length,
+			    const char *expected_hashes[])
+{
+	if (!check(data != NULL)) {
+		test_msg("BUG: NULL data pointer provided");
+		return;
+	}
+
+	for (size_t i = 1; i < ARRAY_SIZE(hash_algos); i++) {
+		git_hash_ctx ctx;
+		unsigned char hash[GIT_MAX_HEXSZ];
+		const struct git_hash_algo *algop = &hash_algos[i];
+
+		algop->init_fn(&ctx);
+		algop->update_fn(&ctx, data, data_length);
+		algop->final_fn(hash, &ctx);
+
+		if (!check_str(hash_to_hex_algop(hash, algop), expected_hashes[i - 1]))
+			test_msg("result does not match with the expected for %s\n", hash_algos[i].name);
+	}
+}
+
+/* Works with a NUL terminated string. Doesn't work if it should contain a NUL character. */
+#define TEST_HASH_STR(data, expected_sha1, expected_sha256) do { \
+		const char *expected_hashes[] = { expected_sha1, expected_sha256 }; \
+		TEST(check_hash_data(data, strlen(data), expected_hashes), \
+		     "SHA1 and SHA256 (%s) works", #data); \
+	} while (0)
+
+/* Only works with a literal string, useful when it contains a NUL character. */
+#define TEST_HASH_LITERAL(literal, expected_sha1, expected_sha256) do { \
+		const char *expected_hashes[] = { expected_sha1, expected_sha256 }; \
+		TEST(check_hash_data(literal, (sizeof(literal) - 1), expected_hashes), \
+		     "SHA1 and SHA256 (%s) works", #literal); \
+	} while (0)
+
+int cmd_main(int argc, const char **argv)
+{
+	struct strbuf aaaaaaaaaa_100000 = STRBUF_INIT;
+	struct strbuf alphabet_100000 = STRBUF_INIT;
+
+	strbuf_addstrings(&aaaaaaaaaa_100000, "aaaaaaaaaa", 100000);
+	strbuf_addstrings(&alphabet_100000, "abcdefghijklmnopqrstuvwxyz", 100000);
+
+	TEST_HASH_STR("",
+		"da39a3ee5e6b4b0d3255bfef95601890afd80709",
+		"e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855");
+	TEST_HASH_STR("a",
+		"86f7e437faa5a7fce15d1ddcb9eaeaea377667b8",
+		"ca978112ca1bbdcafac231b39a23dc4da786eff8147c4e72b9807785afee48bb");
+	TEST_HASH_STR("abc",
+		"a9993e364706816aba3e25717850c26c9cd0d89d",
+		"ba7816bf8f01cfea414140de5dae2223b00361a396177a9cb410ff61f20015ad");
+	TEST_HASH_STR("message digest",
+		"c12252ceda8be8994d5fa0290a47231c1d16aae3",
+		"f7846f55cf23e14eebeab5b4e1550cad5b509e3348fbc4efa3a1413d393cb650");
+	TEST_HASH_STR("abcdefghijklmnopqrstuvwxyz",
+		"32d10c7b8cf96570ca04ce37f2a19d84240d3a89",
+		"71c480df93d6ae2f1efad1447c66c9525e316218cf51fc8d9ed832f2daf18b73");
+	TEST_HASH_STR(aaaaaaaaaa_100000.buf,
+		"34aa973cd4c4daa4f61eeb2bdbad27316534016f",
+		"cdc76e5c9914fb9281a1c7e284d73e67f1809a48a497200e046d39ccc7112cd0");
+	TEST_HASH_STR(alphabet_100000.buf,
+		"e7da7c55b3484fdf52aebec9cbe7b85a98f02fd4",
+		"e406ba321ca712ad35a698bf0af8d61fc4dc40eca6bdcea4697962724ccbde35");
+	TEST_HASH_LITERAL("blob 0\0",
+		"e69de29bb2d1d6434b8b29ae775ad8c2e48c5391",
+		"473a0f4c3be8a93681a267e3b1e9a7dcda1185436fe141f7749120a303721813");
+	TEST_HASH_LITERAL("blob 3\0abc",
+		"f2ba8f84ab5c1bce84a7b441cb1959cfc7093b7f",
+		"c1cf6e465077930e88dc5136641d402f72a229ddd996f627d60e9639eaba35a6");
+	TEST_HASH_LITERAL("tree 0\0",
+		"4b825dc642cb6eb9a060e54bf8d69288fbee4904",
+		"6ef19b41225c5369f1c104d45d8d85efa9b057b53b14b4b9b939dd74decc5321");
+
+	strbuf_release(&aaaaaaaaaa_100000);
+	strbuf_release(&alphabet_100000);
+
+	return test_done();
+}