thodg/libgit2/tests/core/buffer.c

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• Hash : caab22c0
  Author :
  Date : 2015-06-23T15:41:58
  

  buffer: don't allow growing borrowed buffers When we don't own a buffer (asize=0) we currently allow the usage of grow to copy the memory into a buffer we do own. This muddles the meaning of grow, and lets us be a bit cavalier with ownership semantics. Don't allow this any more. Usage of grow should be restricted to buffers which we know own their own memory. If unsure, we must not attempt to modify it.

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• tests/core/buffer.c

• #include "clar_libgit2.h"
  #include "buffer.h"
  #include "buf_text.h"
  #include "git2/sys/hashsig.h"
  #include "fileops.h"
  
  #define TESTSTR "Have you seen that? Have you seeeen that??"
  const char *test_string = TESTSTR;
  const char *test_string_x2 = TESTSTR TESTSTR;
  
  #define TESTSTR_4096 REP1024("1234")
  #define TESTSTR_8192 REP1024("12341234")
  const char *test_4096 = TESTSTR_4096;
  const char *test_8192 = TESTSTR_8192;
  
  /* test basic data concatenation */
  void test_core_buffer__0(void)
  {
  	git_buf buf = GIT_BUF_INIT;
  
  	cl_assert(buf.size == 0);
  
  	git_buf_puts(&buf, test_string);
  	cl_assert(git_buf_oom(&buf) == 0);
  	cl_assert_equal_s(test_string, git_buf_cstr(&buf));
  
  	git_buf_puts(&buf, test_string);
  	cl_assert(git_buf_oom(&buf) == 0);
  	cl_assert_equal_s(test_string_x2, git_buf_cstr(&buf));
  
  	git_buf_free(&buf);
  }
  
  /* test git_buf_printf */
  void test_core_buffer__1(void)
  {
  	git_buf buf = GIT_BUF_INIT;
  
  	git_buf_printf(&buf, "%s %s %d ", "shoop", "da", 23);
  	cl_assert(git_buf_oom(&buf) == 0);
  	cl_assert_equal_s("shoop da 23 ", git_buf_cstr(&buf));
  
  	git_buf_printf(&buf, "%s %d", "woop", 42);
  	cl_assert(git_buf_oom(&buf) == 0);
  	cl_assert_equal_s("shoop da 23 woop 42", git_buf_cstr(&buf));
  
  	git_buf_free(&buf);
  }
  
  /* more thorough test of concatenation options */
  void test_core_buffer__2(void)
  {
  	git_buf buf = GIT_BUF_INIT;
  	int i;
  	char data[128];
  
  	cl_assert(buf.size == 0);
  
  	/* this must be safe to do */
  	git_buf_free(&buf);
  	cl_assert(buf.size == 0);
  	cl_assert(buf.asize == 0);
  
  	/* empty buffer should be empty string */
  	cl_assert_equal_s("", git_buf_cstr(&buf));
  	cl_assert(buf.size == 0);
  	/* cl_assert(buf.asize == 0); -- should not assume what git_buf does */
  
  	/* free should set us back to the beginning */
  	git_buf_free(&buf);
  	cl_assert(buf.size == 0);
  	cl_assert(buf.asize == 0);
  
  	/* add letter */
  	git_buf_putc(&buf, '+');
  	cl_assert(git_buf_oom(&buf) == 0);
  	cl_assert_equal_s("+", git_buf_cstr(&buf));
  
  	/* add letter again */
  	git_buf_putc(&buf, '+');
  	cl_assert(git_buf_oom(&buf) == 0);
  	cl_assert_equal_s("++", git_buf_cstr(&buf));
  
  	/* let's try that a few times */
  	for (i = 0; i < 16; ++i) {
  		git_buf_putc(&buf, '+');
  		cl_assert(git_buf_oom(&buf) == 0);
  	}
  	cl_assert_equal_s("++++++++++++++++++", git_buf_cstr(&buf));
  
  	git_buf_free(&buf);
  
  	/* add data */
  	git_buf_put(&buf, "xo", 2);
  	cl_assert(git_buf_oom(&buf) == 0);
  	cl_assert_equal_s("xo", git_buf_cstr(&buf));
  
  	/* add letter again */
  	git_buf_put(&buf, "xo", 2);
  	cl_assert(git_buf_oom(&buf) == 0);
  	cl_assert_equal_s("xoxo", git_buf_cstr(&buf));
  
  	/* let's try that a few times */
  	for (i = 0; i < 16; ++i) {
  		git_buf_put(&buf, "xo", 2);
  		cl_assert(git_buf_oom(&buf) == 0);
  	}
  	cl_assert_equal_s("xoxoxoxoxoxoxoxoxoxoxoxoxoxoxoxoxoxo",
  					   git_buf_cstr(&buf));
  
  	git_buf_free(&buf);
  
  	/* set to string */
  	git_buf_sets(&buf, test_string);
  	cl_assert(git_buf_oom(&buf) == 0);
  	cl_assert_equal_s(test_string, git_buf_cstr(&buf));
  
  	/* append string */
  	git_buf_puts(&buf, test_string);
  	cl_assert(git_buf_oom(&buf) == 0);
  	cl_assert_equal_s(test_string_x2, git_buf_cstr(&buf));
  
  	/* set to string again (should overwrite - not append) */
  	git_buf_sets(&buf, test_string);
  	cl_assert(git_buf_oom(&buf) == 0);
  	cl_assert_equal_s(test_string, git_buf_cstr(&buf));
  
  	/* test clear */
  	git_buf_clear(&buf);
  	cl_assert_equal_s("", git_buf_cstr(&buf));
  
  	git_buf_free(&buf);
  
  	/* test extracting data into buffer */
  	git_buf_puts(&buf, REP4("0123456789"));
  	cl_assert(git_buf_oom(&buf) == 0);
  
  	git_buf_copy_cstr(data, sizeof(data), &buf);
  	cl_assert_equal_s(REP4("0123456789"), data);
  	git_buf_copy_cstr(data, 11, &buf);
  	cl_assert_equal_s("0123456789", data);
  	git_buf_copy_cstr(data, 3, &buf);
  	cl_assert_equal_s("01", data);
  	git_buf_copy_cstr(data, 1, &buf);
  	cl_assert_equal_s("", data);
  
  	git_buf_copy_cstr(data, sizeof(data), &buf);
  	cl_assert_equal_s(REP4("0123456789"), data);
  
  	git_buf_sets(&buf, REP256("x"));
  	git_buf_copy_cstr(data, sizeof(data), &buf);
  	/* since sizeof(data) == 128, only 127 bytes should be copied */
  	cl_assert_equal_s(REP4(REP16("x")) REP16("x") REP16("x")
  					   REP16("x") "xxxxxxxxxxxxxxx", data);
  
  	git_buf_free(&buf);
  
  	git_buf_copy_cstr(data, sizeof(data), &buf);
  	cl_assert_equal_s("", data);
  }
  
  /* let's do some tests with larger buffers to push our limits */
  void test_core_buffer__3(void)
  {
  	git_buf buf = GIT_BUF_INIT;
  
  	/* set to string */
  	git_buf_set(&buf, test_4096, 4096);
  	cl_assert(git_buf_oom(&buf) == 0);
  	cl_assert_equal_s(test_4096, git_buf_cstr(&buf));
  
  	/* append string */
  	git_buf_puts(&buf, test_4096);
  	cl_assert(git_buf_oom(&buf) == 0);
  	cl_assert_equal_s(test_8192, git_buf_cstr(&buf));
  
  	/* set to string again (should overwrite - not append) */
  	git_buf_set(&buf, test_4096, 4096);
  	cl_assert(git_buf_oom(&buf) == 0);
  	cl_assert_equal_s(test_4096, git_buf_cstr(&buf));
  
  	git_buf_free(&buf);
  }
  
  /* let's try some producer/consumer tests */
  void test_core_buffer__4(void)
  {
  	git_buf buf = GIT_BUF_INIT;
  	int i;
  
  	for (i = 0; i < 10; ++i) {
  		git_buf_puts(&buf, "1234"); /* add 4 */
  		cl_assert(git_buf_oom(&buf) == 0);
  		git_buf_consume(&buf, buf.ptr + 2); /* eat the first two */
  		cl_assert(strlen(git_buf_cstr(&buf)) == (size_t)((i + 1) * 2));
  	}
  	/* we have appended 1234 10x and removed the first 20 letters */
  	cl_assert_equal_s("12341234123412341234", git_buf_cstr(&buf));
  
  	git_buf_consume(&buf, NULL);
  	cl_assert_equal_s("12341234123412341234", git_buf_cstr(&buf));
  
  	git_buf_consume(&buf, "invalid pointer");
  	cl_assert_equal_s("12341234123412341234", git_buf_cstr(&buf));
  
  	git_buf_consume(&buf, buf.ptr);
  	cl_assert_equal_s("12341234123412341234", git_buf_cstr(&buf));
  
  	git_buf_consume(&buf, buf.ptr + 1);
  	cl_assert_equal_s("2341234123412341234", git_buf_cstr(&buf));
  
  	git_buf_consume(&buf, buf.ptr + buf.size);
  	cl_assert_equal_s("", git_buf_cstr(&buf));
  
  	git_buf_free(&buf);
  }
  
  
  static void
  check_buf_append(
  	const char* data_a,
  	const char* data_b,
  	const char* expected_data,
  	size_t expected_size,
  	size_t expected_asize)
  {
  	git_buf tgt = GIT_BUF_INIT;
  
  	git_buf_sets(&tgt, data_a);
  	cl_assert(git_buf_oom(&tgt) == 0);
  	git_buf_puts(&tgt, data_b);
  	cl_assert(git_buf_oom(&tgt) == 0);
  	cl_assert_equal_s(expected_data, git_buf_cstr(&tgt));
  	cl_assert(tgt.size == expected_size);
  	if (expected_asize > 0)
  		cl_assert(tgt.asize == expected_asize);
  
  	git_buf_free(&tgt);
  }
  
  static void
  check_buf_append_abc(
  	const char* buf_a,
  	const char* buf_b,
  	const char* buf_c,
  	const char* expected_ab,
  	const char* expected_abc,
  	const char* expected_abca,
  	const char* expected_abcab,
  	const char* expected_abcabc)
  {
  	git_buf buf = GIT_BUF_INIT;
  
  	git_buf_sets(&buf, buf_a);
  	cl_assert(git_buf_oom(&buf) == 0);
  	cl_assert_equal_s(buf_a, git_buf_cstr(&buf));
  
  	git_buf_puts(&buf, buf_b);
  	cl_assert(git_buf_oom(&buf) == 0);
  	cl_assert_equal_s(expected_ab, git_buf_cstr(&buf));
  
  	git_buf_puts(&buf, buf_c);
  	cl_assert(git_buf_oom(&buf) == 0);
  	cl_assert_equal_s(expected_abc, git_buf_cstr(&buf));
  
  	git_buf_puts(&buf, buf_a);
  	cl_assert(git_buf_oom(&buf) == 0);
  	cl_assert_equal_s(expected_abca, git_buf_cstr(&buf));
  
  	git_buf_puts(&buf, buf_b);
  	cl_assert(git_buf_oom(&buf) == 0);
  	cl_assert_equal_s(expected_abcab, git_buf_cstr(&buf));
  
  	git_buf_puts(&buf, buf_c);
  	cl_assert(git_buf_oom(&buf) == 0);
  	cl_assert_equal_s(expected_abcabc, git_buf_cstr(&buf));
  
  	git_buf_free(&buf);
  }
  
  /* more variations on append tests */
  void test_core_buffer__5(void)
  {
  	check_buf_append("", "", "", 0, 0);
  	check_buf_append("a", "", "a", 1, 0);
  	check_buf_append("", "a", "a", 1, 8);
  	check_buf_append("", "a", "a", 1, 8);
  	check_buf_append("a", "b", "ab", 2, 8);
  	check_buf_append("", "abcdefgh", "abcdefgh", 8, 16);
  	check_buf_append("abcdefgh", "", "abcdefgh", 8, 16);
  
  	/* buffer with starting asize will grow to:
  	 *  1 ->  2,  2 ->  3,  3 ->  5,  4 ->  6,  5 ->  8,  6 ->  9,
  	 *  7 -> 11,  8 -> 12,  9 -> 14, 10 -> 15, 11 -> 17, 12 -> 18,
  	 * 13 -> 20, 14 -> 21, 15 -> 23, 16 -> 24, 17 -> 26, 18 -> 27,
  	 * 19 -> 29, 20 -> 30, 21 -> 32, 22 -> 33, 23 -> 35, 24 -> 36,
  	 * ...
  	 * follow sequence until value > target size,
  	 * then round up to nearest multiple of 8.
  	 */
  
  	check_buf_append("abcdefgh", "/", "abcdefgh/", 9, 16);
  	check_buf_append("abcdefgh", "ijklmno", "abcdefghijklmno", 15, 16);
  	check_buf_append("abcdefgh", "ijklmnop", "abcdefghijklmnop", 16, 24);
  	check_buf_append("0123456789", "0123456789",
  					 "01234567890123456789", 20, 24);
  	check_buf_append(REP16("x"), REP16("o"),
  					 REP16("x") REP16("o"), 32, 40);
  
  	check_buf_append(test_4096, "", test_4096, 4096, 4104);
  	check_buf_append(test_4096, test_4096, test_8192, 8192, 9240);
  
  	/* check sequences of appends */
  	check_buf_append_abc("a", "b", "c",
  						 "ab", "abc", "abca", "abcab", "abcabc");
  	check_buf_append_abc("a1", "b2", "c3",
  						 "a1b2", "a1b2c3", "a1b2c3a1",
  						 "a1b2c3a1b2", "a1b2c3a1b2c3");
  	check_buf_append_abc("a1/", "b2/", "c3/",
  						 "a1/b2/", "a1/b2/c3/", "a1/b2/c3/a1/",
  						 "a1/b2/c3/a1/b2/", "a1/b2/c3/a1/b2/c3/");
  }
  
  /* test swap */
  void test_core_buffer__6(void)
  {
  	git_buf a = GIT_BUF_INIT;
  	git_buf b = GIT_BUF_INIT;
  
  	git_buf_sets(&a, "foo");
  	cl_assert(git_buf_oom(&a) == 0);
  	git_buf_sets(&b, "bar");
  	cl_assert(git_buf_oom(&b) == 0);
  
  	cl_assert_equal_s("foo", git_buf_cstr(&a));
  	cl_assert_equal_s("bar", git_buf_cstr(&b));
  
  	git_buf_swap(&a, &b);
  
  	cl_assert_equal_s("bar", git_buf_cstr(&a));
  	cl_assert_equal_s("foo", git_buf_cstr(&b));
  
  	git_buf_free(&a);
  	git_buf_free(&b);
  }
  
  
  /* test detach/attach data */
  void test_core_buffer__7(void)
  {
  	const char *fun = "This is fun";
  	git_buf a = GIT_BUF_INIT;
  	char *b = NULL;
  
  	git_buf_sets(&a, "foo");
  	cl_assert(git_buf_oom(&a) == 0);
  	cl_assert_equal_s("foo", git_buf_cstr(&a));
  
  	b = git_buf_detach(&a);
  
  	cl_assert_equal_s("foo", b);
  	cl_assert_equal_s("", a.ptr);
  	git__free(b);
  
  	b = git_buf_detach(&a);
  
  	cl_assert_equal_s(NULL, b);
  	cl_assert_equal_s("", a.ptr);
  
  	git_buf_free(&a);
  
  	b = git__strdup(fun);
  	git_buf_attach(&a, b, 0);
  
  	cl_assert_equal_s(fun, a.ptr);
  	cl_assert(a.size == strlen(fun));
  	cl_assert(a.asize == strlen(fun) + 1);
  
  	git_buf_free(&a);
  
  	b = git__strdup(fun);
  	git_buf_attach(&a, b, strlen(fun) + 1);
  
  	cl_assert_equal_s(fun, a.ptr);
  	cl_assert(a.size == strlen(fun));
  	cl_assert(a.asize == strlen(fun) + 1);
  
  	git_buf_free(&a);
  }
  
  
  static void
  check_joinbuf_2(
  	const char *a,
  	const char *b,
  	const char *expected)
  {
  	char sep = '/';
  	git_buf buf = GIT_BUF_INIT;
  
  	git_buf_join(&buf, sep, a, b);
  	cl_assert(git_buf_oom(&buf) == 0);
  	cl_assert_equal_s(expected, git_buf_cstr(&buf));
  	git_buf_free(&buf);
  }
  
  static void
  check_joinbuf_overlapped(
  	const char *oldval,
  	int ofs_a,
  	const char *b,
  	const char *expected)
  {
  	char sep = '/';
  	git_buf buf = GIT_BUF_INIT;
  
  	git_buf_sets(&buf, oldval);
  	git_buf_join(&buf, sep, buf.ptr + ofs_a, b);
  	cl_assert(git_buf_oom(&buf) == 0);
  	cl_assert_equal_s(expected, git_buf_cstr(&buf));
  	git_buf_free(&buf);
  }
  
  static void
  check_joinbuf_n_2(
  	const char *a,
  	const char *b,
  	const char *expected)
  {
  	char sep = '/';
  	git_buf buf = GIT_BUF_INIT;
  
  	git_buf_sets(&buf, a);
  	cl_assert(git_buf_oom(&buf) == 0);
  
  	git_buf_join_n(&buf, sep, 1, b);
  	cl_assert(git_buf_oom(&buf) == 0);
  	cl_assert_equal_s(expected, git_buf_cstr(&buf));
  
  	git_buf_free(&buf);
  }
  
  static void
  check_joinbuf_n_4(
  	const char *a,
  	const char *b,
  	const char *c,
  	const char *d,
  	const char *expected)
  {
  	char sep = ';';
  	git_buf buf = GIT_BUF_INIT;
  	git_buf_join_n(&buf, sep, 4, a, b, c, d);
  	cl_assert(git_buf_oom(&buf) == 0);
  	cl_assert_equal_s(expected, git_buf_cstr(&buf));
  	git_buf_free(&buf);
  }
  
  /* test join */
  void test_core_buffer__8(void)
  {
  	git_buf a = GIT_BUF_INIT;
  
  	git_buf_join_n(&a, '/', 1, "foo");
  	cl_assert(git_buf_oom(&a) == 0);
  	cl_assert_equal_s("foo", git_buf_cstr(&a));
  
  	git_buf_join_n(&a, '/', 1, "bar");
  	cl_assert(git_buf_oom(&a) == 0);
  	cl_assert_equal_s("foo/bar", git_buf_cstr(&a));
  
  	git_buf_join_n(&a, '/', 1, "baz");
  	cl_assert(git_buf_oom(&a) == 0);
  	cl_assert_equal_s("foo/bar/baz", git_buf_cstr(&a));
  
  	git_buf_free(&a);
  
  	check_joinbuf_2(NULL, "", "");
  	check_joinbuf_2(NULL, "a", "a");
  	check_joinbuf_2(NULL, "/a", "/a");
  	check_joinbuf_2("", "", "");
  	check_joinbuf_2("", "a", "a");
  	check_joinbuf_2("", "/a", "/a");
  	check_joinbuf_2("a", "", "a/");
  	check_joinbuf_2("a", "/", "a/");
  	check_joinbuf_2("a", "b", "a/b");
  	check_joinbuf_2("/", "a", "/a");
  	check_joinbuf_2("/", "", "/");
  	check_joinbuf_2("/a", "/b", "/a/b");
  	check_joinbuf_2("/a", "/b/", "/a/b/");
  	check_joinbuf_2("/a/", "b/", "/a/b/");
  	check_joinbuf_2("/a/", "/b/", "/a/b/");
  	check_joinbuf_2("/a/", "//b/", "/a/b/");
  	check_joinbuf_2("/abcd", "/defg", "/abcd/defg");
  	check_joinbuf_2("/abcd", "/defg/", "/abcd/defg/");
  	check_joinbuf_2("/abcd/", "defg/", "/abcd/defg/");
  	check_joinbuf_2("/abcd/", "/defg/", "/abcd/defg/");
  
  	check_joinbuf_overlapped("abcd", 0, "efg", "abcd/efg");
  	check_joinbuf_overlapped("abcd", 1, "efg", "bcd/efg");
  	check_joinbuf_overlapped("abcd", 2, "efg", "cd/efg");
  	check_joinbuf_overlapped("abcd", 3, "efg", "d/efg");
  	check_joinbuf_overlapped("abcd", 4, "efg", "efg");
  	check_joinbuf_overlapped("abc/", 2, "efg", "c/efg");
  	check_joinbuf_overlapped("abc/", 3, "efg", "/efg");
  	check_joinbuf_overlapped("abc/", 4, "efg", "efg");
  	check_joinbuf_overlapped("abcd", 3, "", "d/");
  	check_joinbuf_overlapped("abcd", 4, "", "");
  	check_joinbuf_overlapped("abc/", 2, "", "c/");
  	check_joinbuf_overlapped("abc/", 3, "", "/");
  	check_joinbuf_overlapped("abc/", 4, "", "");
  
  	check_joinbuf_n_2("", "", "");
  	check_joinbuf_n_2("", "a", "a");
  	check_joinbuf_n_2("", "/a", "/a");
  	check_joinbuf_n_2("a", "", "a/");
  	check_joinbuf_n_2("a", "/", "a/");
  	check_joinbuf_n_2("a", "b", "a/b");
  	check_joinbuf_n_2("/", "a", "/a");
  	check_joinbuf_n_2("/", "", "/");
  	check_joinbuf_n_2("/a", "/b", "/a/b");
  	check_joinbuf_n_2("/a", "/b/", "/a/b/");
  	check_joinbuf_n_2("/a/", "b/", "/a/b/");
  	check_joinbuf_n_2("/a/", "/b/", "/a/b/");
  	check_joinbuf_n_2("/abcd", "/defg", "/abcd/defg");
  	check_joinbuf_n_2("/abcd", "/defg/", "/abcd/defg/");
  	check_joinbuf_n_2("/abcd/", "defg/", "/abcd/defg/");
  	check_joinbuf_n_2("/abcd/", "/defg/", "/abcd/defg/");
  
  	check_joinbuf_n_4("", "", "", "", "");
  	check_joinbuf_n_4("", "a", "", "", "a;");
  	check_joinbuf_n_4("a", "", "", "", "a;");
  	check_joinbuf_n_4("", "", "", "a", "a");
  	check_joinbuf_n_4("a", "b", "", ";c;d;", "a;b;c;d;");
  	check_joinbuf_n_4("a", "b", "", ";c;d", "a;b;c;d");
  	check_joinbuf_n_4("abcd", "efgh", "ijkl", "mnop", "abcd;efgh;ijkl;mnop");
  	check_joinbuf_n_4("abcd;", "efgh;", "ijkl;", "mnop;", "abcd;efgh;ijkl;mnop;");
  	check_joinbuf_n_4(";abcd;", ";efgh;", ";ijkl;", ";mnop;", ";abcd;efgh;ijkl;mnop;");
  }
  
  void test_core_buffer__9(void)
  {
  	git_buf buf = GIT_BUF_INIT;
  
  	/* just some exhaustive tests of various separator placement */
  	char *a[] = { "", "-", "a-", "-a", "-a-" };
  	char *b[] = { "", "-", "b-", "-b", "-b-" };
  	char sep[] = { 0, '-', '/' };
  	char *expect_null[] = { "",    "-",     "a-",     "-a",     "-a-",
  							"-",   "--",    "a--",    "-a-",    "-a--",
  							"b-",  "-b-",   "a-b-",   "-ab-",   "-a-b-",
  							"-b",  "--b",   "a--b",   "-a-b",   "-a--b",
  							"-b-", "--b-",  "a--b-",  "-a-b-",  "-a--b-" };
  	char *expect_dash[] = { "",    "-",     "a-",     "-a-",    "-a-",
  							"-",   "-",     "a-",     "-a-",    "-a-",
  							"b-",  "-b-",   "a-b-",   "-a-b-",  "-a-b-",
  							"-b",  "-b",    "a-b",    "-a-b",   "-a-b",
  							"-b-", "-b-",   "a-b-",   "-a-b-",  "-a-b-" };
  	char *expect_slas[] = { "",    "-/",    "a-/",    "-a/",    "-a-/",
  							"-",   "-/-",   "a-/-",   "-a/-",   "-a-/-",
  							"b-",  "-/b-",  "a-/b-",  "-a/b-",  "-a-/b-",
  							"-b",  "-/-b",  "a-/-b",  "-a/-b",  "-a-/-b",
  							"-b-", "-/-b-", "a-/-b-", "-a/-b-", "-a-/-b-" };
  	char **expect_values[] = { expect_null, expect_dash, expect_slas };
  	char separator, **expect;
  	unsigned int s, i, j;
  
  	for (s = 0; s < sizeof(sep) / sizeof(char); ++s) {
  		separator = sep[s];
  		expect = expect_values[s];
  
  		for (j = 0; j < sizeof(b) / sizeof(char*); ++j) {
  			for (i = 0; i < sizeof(a) / sizeof(char*); ++i) {
  				git_buf_join(&buf, separator, a[i], b[j]);
  				cl_assert_equal_s(*expect, buf.ptr);
  				expect++;
  			}
  		}
  	}
  
  	git_buf_free(&buf);
  }
  
  void test_core_buffer__10(void)
  {
  	git_buf a = GIT_BUF_INIT;
  
  	cl_git_pass(git_buf_join_n(&a, '/', 1, "test"));
  	cl_assert_equal_s(a.ptr, "test");
  	cl_git_pass(git_buf_join_n(&a, '/', 1, "string"));
  	cl_assert_equal_s(a.ptr, "test/string");
  	git_buf_clear(&a);
  	cl_git_pass(git_buf_join_n(&a, '/', 3, "test", "string", "join"));
  	cl_assert_equal_s(a.ptr, "test/string/join");
  	cl_git_pass(git_buf_join_n(&a, '/', 2, a.ptr, "more"));
  	cl_assert_equal_s(a.ptr, "test/string/join/test/string/join/more");
  
  	git_buf_free(&a);
  }
  
  void test_core_buffer__join3(void)
  {
  	git_buf a = GIT_BUF_INIT;
  
  	cl_git_pass(git_buf_join3(&a, '/', "test", "string", "join"));
  	cl_assert_equal_s("test/string/join", a.ptr);
  	cl_git_pass(git_buf_join3(&a, '/', "test/", "string", "join"));
  	cl_assert_equal_s("test/string/join", a.ptr);
  	cl_git_pass(git_buf_join3(&a, '/', "test/", "/string", "join"));
  	cl_assert_equal_s("test/string/join", a.ptr);
  	cl_git_pass(git_buf_join3(&a, '/', "test/", "/string/", "join"));
  	cl_assert_equal_s("test/string/join", a.ptr);
  	cl_git_pass(git_buf_join3(&a, '/', "test/", "/string/", "/join"));
  	cl_assert_equal_s("test/string/join", a.ptr);
  
  	cl_git_pass(git_buf_join3(&a, '/', "", "string", "join"));
  	cl_assert_equal_s("string/join", a.ptr);
  	cl_git_pass(git_buf_join3(&a, '/', "", "string/", "join"));
  	cl_assert_equal_s("string/join", a.ptr);
  	cl_git_pass(git_buf_join3(&a, '/', "", "string/", "/join"));
  	cl_assert_equal_s("string/join", a.ptr);
  
  	cl_git_pass(git_buf_join3(&a, '/', "string", "", "join"));
  	cl_assert_equal_s("string/join", a.ptr);
  	cl_git_pass(git_buf_join3(&a, '/', "string/", "", "join"));
  	cl_assert_equal_s("string/join", a.ptr);
  	cl_git_pass(git_buf_join3(&a, '/', "string/", "", "/join"));
  	cl_assert_equal_s("string/join", a.ptr);
  
  	git_buf_free(&a);
  }
  
  void test_core_buffer__11(void)
  {
  	git_buf a = GIT_BUF_INIT;
  	git_strarray t;
  	char *t1[] = { "nothing", "in", "common" };
  	char *t2[] = { "something", "something else", "some other" };
  	char *t3[] = { "something", "some fun", "no fun" };
  	char *t4[] = { "happy", "happier", "happiest" };
  	char *t5[] = { "happiest", "happier", "happy" };
  	char *t6[] = { "no", "nope", "" };
  	char *t7[] = { "", "doesn't matter" };
  
  	t.strings = t1;
  	t.count = 3;
  	cl_git_pass(git_buf_text_common_prefix(&a, &t));
  	cl_assert_equal_s(a.ptr, "");
  
  	t.strings = t2;
  	t.count = 3;
  	cl_git_pass(git_buf_text_common_prefix(&a, &t));
  	cl_assert_equal_s(a.ptr, "some");
  
  	t.strings = t3;
  	t.count = 3;
  	cl_git_pass(git_buf_text_common_prefix(&a, &t));
  	cl_assert_equal_s(a.ptr, "");
  
  	t.strings = t4;
  	t.count = 3;
  	cl_git_pass(git_buf_text_common_prefix(&a, &t));
  	cl_assert_equal_s(a.ptr, "happ");
  
  	t.strings = t5;
  	t.count = 3;
  	cl_git_pass(git_buf_text_common_prefix(&a, &t));
  	cl_assert_equal_s(a.ptr, "happ");
  
  	t.strings = t6;
  	t.count = 3;
  	cl_git_pass(git_buf_text_common_prefix(&a, &t));
  	cl_assert_equal_s(a.ptr, "");
  
  	t.strings = t7;
  	t.count = 3;
  	cl_git_pass(git_buf_text_common_prefix(&a, &t));
  	cl_assert_equal_s(a.ptr, "");
  
  	git_buf_free(&a);
  }
  
  void test_core_buffer__rfind_variants(void)
  {
  	git_buf a = GIT_BUF_INIT;
  	ssize_t len;
  
  	cl_git_pass(git_buf_sets(&a, "/this/is/it/"));
  
  	len = (ssize_t)git_buf_len(&a);
  
  	cl_assert(git_buf_rfind(&a, '/') == len - 1);
  	cl_assert(git_buf_rfind_next(&a, '/') == len - 4);
  
  	cl_assert(git_buf_rfind(&a, 'i') == len - 3);
  	cl_assert(git_buf_rfind_next(&a, 'i') == len - 3);
  
  	cl_assert(git_buf_rfind(&a, 'h') == 2);
  	cl_assert(git_buf_rfind_next(&a, 'h') == 2);
  
  	cl_assert(git_buf_rfind(&a, 'q') == -1);
  	cl_assert(git_buf_rfind_next(&a, 'q') == -1);
  
  	git_buf_free(&a);
  }
  
  void test_core_buffer__puts_escaped(void)
  {
  	git_buf a = GIT_BUF_INIT;
  
  	git_buf_clear(&a);
  	cl_git_pass(git_buf_text_puts_escaped(&a, "this is a test", "", ""));
  	cl_assert_equal_s("this is a test", a.ptr);
  
  	git_buf_clear(&a);
  	cl_git_pass(git_buf_text_puts_escaped(&a, "this is a test", "t", "\\"));
  	cl_assert_equal_s("\\this is a \\tes\\t", a.ptr);
  
  	git_buf_clear(&a);
  	cl_git_pass(git_buf_text_puts_escaped(&a, "this is a test", "i ", "__"));
  	cl_assert_equal_s("th__is__ __is__ a__ test", a.ptr);
  
  	git_buf_clear(&a);
  	cl_git_pass(git_buf_text_puts_escape_regex(&a, "^match\\s*[A-Z]+.*"));
  	cl_assert_equal_s("\\^match\\\\s\\*\\[A-Z\\]\\+\\.\\*", a.ptr);
  
  	git_buf_free(&a);
  }
  
  static void assert_unescape(char *expected, char *to_unescape) {
  	git_buf buf = GIT_BUF_INIT;
  
  	cl_git_pass(git_buf_sets(&buf, to_unescape));
  	git_buf_text_unescape(&buf);
  	cl_assert_equal_s(expected, buf.ptr);
  	cl_assert_equal_sz(strlen(expected), buf.size);
  
  	git_buf_free(&buf);
  }
  
  void test_core_buffer__unescape(void)
  {
  	assert_unescape("Escaped\\", "Es\\ca\\ped\\");
  	assert_unescape("Es\\caped\\", "Es\\\\ca\\ped\\\\");
  	assert_unescape("\\", "\\");
  	assert_unescape("\\", "\\\\");
  	assert_unescape("", "");
  }
  
  void test_core_buffer__encode_base64(void)
  {
  	git_buf buf = GIT_BUF_INIT;
  
  	/*     t  h  i  s
  	 * 0x 74 68 69 73
       * 0b 01110100 01101000 01101001 01110011
  	 * 0b 011101 000110 100001 101001 011100 110000
  	 * 0x 1d 06 21 29 1c 30
  	 *     d  G  h  p  c  w
  	 */
  	cl_git_pass(git_buf_encode_base64(&buf, "this", 4));
  	cl_assert_equal_s("dGhpcw==", buf.ptr);
  
  	git_buf_clear(&buf);
  	cl_git_pass(git_buf_encode_base64(&buf, "this!", 5));
  	cl_assert_equal_s("dGhpcyE=", buf.ptr);
  
  	git_buf_clear(&buf);
  	cl_git_pass(git_buf_encode_base64(&buf, "this!\n", 6));
  	cl_assert_equal_s("dGhpcyEK", buf.ptr);
  
  	git_buf_free(&buf);
  }
  
  void test_core_buffer__decode_base64(void)
  {
  	git_buf buf = GIT_BUF_INIT;
  
  	cl_git_pass(git_buf_decode_base64(&buf, "dGhpcw==", 8));
  	cl_assert_equal_s("this", buf.ptr);
  
  	git_buf_clear(&buf);
  	cl_git_pass(git_buf_decode_base64(&buf, "dGhpcyE=", 8));
  	cl_assert_equal_s("this!", buf.ptr);
  
  	git_buf_clear(&buf);
  	cl_git_pass(git_buf_decode_base64(&buf, "dGhpcyEK", 8));
  	cl_assert_equal_s("this!\n", buf.ptr);
  
  	cl_git_fail(git_buf_decode_base64(&buf, "This is not a valid base64 string!!!", 36));
  	cl_assert_equal_s("this!\n", buf.ptr);
  
  	git_buf_free(&buf);
  }
  
  void test_core_buffer__encode_base85(void)
  {
  	git_buf buf = GIT_BUF_INIT;
  
  	cl_git_pass(git_buf_encode_base85(&buf, "this", 4));
  	cl_assert_equal_s("bZBXF", buf.ptr);
  	git_buf_clear(&buf);
  
  	cl_git_pass(git_buf_encode_base85(&buf, "two rnds", 8));
  	cl_assert_equal_s("ba!tca&BaE", buf.ptr);
  	git_buf_clear(&buf);
  
  	cl_git_pass(git_buf_encode_base85(&buf, "this is base 85 encoded",
  		strlen("this is base 85 encoded")));
  	cl_assert_equal_s("bZBXFAZc?TVqtS-AUHK3Wo~0{WMyOk", buf.ptr);
  	git_buf_clear(&buf);
  
  	git_buf_free(&buf);
  }
  
  void test_core_buffer__classify_with_utf8(void)
  {
  	char *data0 = "Simple text\n";
  	size_t data0len = 12;
  	char *data1 = "Is that UTF-8 data I see…\nYep!\n";
  	size_t data1len = 31;
  	char *data2 = "Internal NUL!!!\000\n\nI see you!\n";
  	size_t data2len = 29;
  	char *data3 = "\xef\xbb\xbfThis is UTF-8 with a BOM.\n";
  	size_t data3len = 20;
  	git_buf b;
  
  	b.ptr = data0; b.size = b.asize = data0len;
  	cl_assert(!git_buf_text_is_binary(&b));
  	cl_assert(!git_buf_text_contains_nul(&b));
  
  	b.ptr = data1; b.size = b.asize = data1len;
  	cl_assert(!git_buf_text_is_binary(&b));
  	cl_assert(!git_buf_text_contains_nul(&b));
  
  	b.ptr = data2; b.size = b.asize = data2len;
  	cl_assert(git_buf_text_is_binary(&b));
  	cl_assert(git_buf_text_contains_nul(&b));
  
  	b.ptr = data3; b.size = b.asize = data3len;
  	cl_assert(!git_buf_text_is_binary(&b));
  	cl_assert(!git_buf_text_contains_nul(&b));
  }
  
  #define SIMILARITY_TEST_DATA_1 \
  	"000\n001\n002\n003\n004\n005\n006\n007\n008\n009\n" \
  	"010\n011\n012\n013\n014\n015\n016\n017\n018\n019\n" \
  	"020\n021\n022\n023\n024\n025\n026\n027\n028\n029\n" \
  	"030\n031\n032\n033\n034\n035\n036\n037\n038\n039\n" \
  	"040\n041\n042\n043\n044\n045\n046\n047\n048\n049\n"
  
  void test_core_buffer__similarity_metric(void)
  {
  	git_hashsig *a, *b;
  	git_buf buf = GIT_BUF_INIT;
  	int sim;
  
  	/* in the first case, we compare data to itself and expect 100% match */
  
  	cl_git_pass(git_buf_sets(&buf, SIMILARITY_TEST_DATA_1));
  	cl_git_pass(git_hashsig_create(&a, buf.ptr, buf.size, GIT_HASHSIG_NORMAL));
  	cl_git_pass(git_hashsig_create(&b, buf.ptr, buf.size, GIT_HASHSIG_NORMAL));
  
  	cl_assert_equal_i(100, git_hashsig_compare(a, b));
  
  	git_hashsig_free(a);
  	git_hashsig_free(b);
  
  	/* if we change just a single byte, how much does that change magnify? */
  
  	cl_git_pass(git_buf_sets(&buf, SIMILARITY_TEST_DATA_1));
  	cl_git_pass(git_hashsig_create(&a, buf.ptr, buf.size, GIT_HASHSIG_NORMAL));
  	cl_git_pass(git_buf_sets(&buf,
  		"000\n001\n002\n003\n004\n005\n006\n007\n008\n009\n" \
  		"010\n011\n012\n013\n014\n015\n016\n017\n018\n019\n" \
  		"x020x\n021\n022\n023\n024\n025\n026\n027\n028\n029\n" \
  		"030\n031\n032\n033\n034\n035\n036\n037\n038\n039\n" \
  		"040\n041\n042\n043\n044\n045\n046\n047\n048\n049\n"
  		));
  	cl_git_pass(git_hashsig_create(&b, buf.ptr, buf.size, GIT_HASHSIG_NORMAL));
  
  	sim = git_hashsig_compare(a, b);
  
  	cl_assert_in_range(95, sim, 100); /* expect >95% similarity */
  
  	git_hashsig_free(a);
  	git_hashsig_free(b);
  
  	/* let's try comparing data to a superset of itself */
  
  	cl_git_pass(git_buf_sets(&buf, SIMILARITY_TEST_DATA_1));
  	cl_git_pass(git_hashsig_create(&a, buf.ptr, buf.size, GIT_HASHSIG_NORMAL));
  	cl_git_pass(git_buf_sets(&buf, SIMILARITY_TEST_DATA_1
  		"050\n051\n052\n053\n054\n055\n056\n057\n058\n059\n"));
  	cl_git_pass(git_hashsig_create(&b, buf.ptr, buf.size, GIT_HASHSIG_NORMAL));
  
  	sim = git_hashsig_compare(a, b);
  	/* 20% lines added ~= 10% lines changed */
  
  	cl_assert_in_range(85, sim, 95); /* expect similarity around 90% */
  
  	git_hashsig_free(a);
  	git_hashsig_free(b);
  
  	/* what if we keep about half the original data and add half new */
  
  	cl_git_pass(git_buf_sets(&buf, SIMILARITY_TEST_DATA_1));
  	cl_git_pass(git_hashsig_create(&a, buf.ptr, buf.size, GIT_HASHSIG_NORMAL));
  	cl_git_pass(git_buf_sets(&buf,
  		"000\n001\n002\n003\n004\n005\n006\n007\n008\n009\n" \
  		"010\n011\n012\n013\n014\n015\n016\n017\n018\n019\n" \
  		"020x\n021\n022\n023\n024\n" \
  		"x25\nx26\nx27\nx28\nx29\n" \
  		"x30\nx31\nx32\nx33\nx34\nx35\nx36\nx37\nx38\nx39\n" \
  		"x40\nx41\nx42\nx43\nx44\nx45\nx46\nx47\nx48\nx49\n"
  		));
  	cl_git_pass(git_hashsig_create(&b, buf.ptr, buf.size, GIT_HASHSIG_NORMAL));
  
  	sim = git_hashsig_compare(a, b);
  	/* 50% lines changed */
  
  	cl_assert_in_range(40, sim, 60); /* expect in the 40-60% similarity range */
  
  	git_hashsig_free(a);
  	git_hashsig_free(b);
  
  	/* lastly, let's check that we can hash file content as well */
  
  	cl_git_pass(git_buf_sets(&buf, SIMILARITY_TEST_DATA_1));
  	cl_git_pass(git_hashsig_create(&a, buf.ptr, buf.size, GIT_HASHSIG_NORMAL));
  
  	cl_git_pass(git_futils_mkdir("scratch", NULL, 0755, GIT_MKDIR_PATH));
  	cl_git_mkfile("scratch/testdata", SIMILARITY_TEST_DATA_1);
  	cl_git_pass(git_hashsig_create_fromfile(
  		&b, "scratch/testdata", GIT_HASHSIG_NORMAL));
  
  	cl_assert_equal_i(100, git_hashsig_compare(a, b));
  
  	git_hashsig_free(a);
  	git_hashsig_free(b);
  
  	git_buf_free(&buf);
  	git_futils_rmdir_r("scratch", NULL, GIT_RMDIR_REMOVE_FILES);
  }
  
  
  void test_core_buffer__similarity_metric_whitespace(void)
  {
  	git_hashsig *a, *b;
  	git_buf buf = GIT_BUF_INIT;
  	int sim, i, j;
  	git_hashsig_option_t opt;
  	const char *tabbed =
  		"	for (s = 0; s < sizeof(sep) / sizeof(char); ++s) {\n"
  		"		separator = sep[s];\n"
  		"		expect = expect_values[s];\n"
  		"\n"
  		"		for (j = 0; j < sizeof(b) / sizeof(char*); ++j) {\n"
  		"			for (i = 0; i < sizeof(a) / sizeof(char*); ++i) {\n"
  		"				git_buf_join(&buf, separator, a[i], b[j]);\n"
  		"				cl_assert_equal_s(*expect, buf.ptr);\n"
  		"				expect++;\n"
  		"			}\n"
  		"		}\n"
  		"	}\n";
  	const char *spaced =
  		"   for (s = 0; s < sizeof(sep) / sizeof(char); ++s) {\n"
  		"       separator = sep[s];\n"
  		"       expect = expect_values[s];\n"
  		"\n"
  		"       for (j = 0; j < sizeof(b) / sizeof(char*); ++j) {\n"
  		"           for (i = 0; i < sizeof(a) / sizeof(char*); ++i) {\n"
  		"               git_buf_join(&buf, separator, a[i], b[j]);\n"
  		"               cl_assert_equal_s(*expect, buf.ptr);\n"
  		"               expect++;\n"
  		"           }\n"
  		"       }\n"
  		"   }\n";
  	const char *crlf_spaced2 =
  		"  for (s = 0; s < sizeof(sep) / sizeof(char); ++s) {\r\n"
  		"    separator = sep[s];\r\n"
  		"    expect = expect_values[s];\r\n"
  		"\r\n"
  		"    for (j = 0; j < sizeof(b) / sizeof(char*); ++j) {\r\n"
  		"      for (i = 0; i < sizeof(a) / sizeof(char*); ++i) {\r\n"
  		"        git_buf_join(&buf, separator, a[i], b[j]);\r\n"
  		"        cl_assert_equal_s(*expect, buf.ptr);\r\n"
  		"        expect++;\r\n"
  		"      }\r\n"
  		"    }\r\n"
  		"  }\r\n";
  	const char *text[3] = { tabbed, spaced, crlf_spaced2 };
  
  	/* let's try variations of our own code with whitespace changes */
  
  	for (opt = GIT_HASHSIG_NORMAL; opt <= GIT_HASHSIG_SMART_WHITESPACE; ++opt) {
  		for (i = 0; i < 3; ++i) {
  			for (j = 0; j < 3; ++j) {
  				cl_git_pass(git_buf_sets(&buf, text[i]));
  				cl_git_pass(git_hashsig_create(&a, buf.ptr, buf.size, opt));
  
  				cl_git_pass(git_buf_sets(&buf, text[j]));
  				cl_git_pass(git_hashsig_create(&b, buf.ptr, buf.size, opt));
  
  				sim = git_hashsig_compare(a, b);
  
  				if (opt == GIT_HASHSIG_NORMAL) {
  					if (i == j)
  						cl_assert_equal_i(100, sim);
  					else
  						cl_assert_in_range(0, sim, 30); /* pretty different */
  				} else {
  					cl_assert_equal_i(100, sim);
  				}
  
  				git_hashsig_free(a);
  				git_hashsig_free(b);
  			}
  		}
  	}
  
  	git_buf_free(&buf);
  }
  
  #include "../filter/crlf.h"
  
  #define check_buf(expected,buf) do { \
  	cl_assert_equal_s(expected, buf.ptr); \
  	cl_assert_equal_sz(strlen(expected), buf.size); } while (0)
  
  void test_core_buffer__lf_and_crlf_conversions(void)
  {
  	git_buf src = GIT_BUF_INIT, tgt = GIT_BUF_INIT;
  
  	/* LF source */
  
  	git_buf_sets(&src, "lf\nlf\nlf\nlf\n");
  
  	cl_git_pass(git_buf_text_lf_to_crlf(&tgt, &src));
  	check_buf("lf\r\nlf\r\nlf\r\nlf\r\n", tgt);
  
  	cl_git_pass(git_buf_text_crlf_to_lf(&tgt, &src));
  	check_buf(src.ptr, tgt);
  
  	git_buf_sets(&src, "\nlf\nlf\nlf\nlf\nlf");
  
  	cl_git_pass(git_buf_text_lf_to_crlf(&tgt, &src));
  	check_buf("\r\nlf\r\nlf\r\nlf\r\nlf\r\nlf", tgt);
  
  	cl_git_pass(git_buf_text_crlf_to_lf(&tgt, &src));
  	check_buf(src.ptr, tgt);
  
  	/* CRLF source */
  
  	git_buf_sets(&src, "crlf\r\ncrlf\r\ncrlf\r\ncrlf\r\n");
  
  	cl_git_pass(git_buf_text_lf_to_crlf(&tgt, &src));
  	check_buf("crlf\r\ncrlf\r\ncrlf\r\ncrlf\r\n", tgt);
  
  	git_buf_sets(&src, "crlf\r\ncrlf\r\ncrlf\r\ncrlf\r\n");
  
  	cl_git_pass(git_buf_text_crlf_to_lf(&tgt, &src));
  	check_buf("crlf\ncrlf\ncrlf\ncrlf\n", tgt);
  
  	git_buf_sets(&src, "\r\ncrlf\r\ncrlf\r\ncrlf\r\ncrlf\r\ncrlf");
  
  	cl_git_pass(git_buf_text_lf_to_crlf(&tgt, &src));
  	check_buf("\r\ncrlf\r\ncrlf\r\ncrlf\r\ncrlf\r\ncrlf", tgt);
  
  	git_buf_sets(&src, "\r\ncrlf\r\ncrlf\r\ncrlf\r\ncrlf\r\ncrlf");
  
  	cl_git_pass(git_buf_text_crlf_to_lf(&tgt, &src));
  	check_buf("\ncrlf\ncrlf\ncrlf\ncrlf\ncrlf", tgt);
  
  	/* CRLF in LF text */
  
  	git_buf_sets(&src, "\nlf\nlf\ncrlf\r\nlf\nlf\ncrlf\r\n");
  
  	cl_git_pass(git_buf_text_lf_to_crlf(&tgt, &src));
  	check_buf("\r\nlf\r\nlf\r\ncrlf\r\nlf\r\nlf\r\ncrlf\r\n", tgt);
  
  	git_buf_sets(&src, "\nlf\nlf\ncrlf\r\nlf\nlf\ncrlf\r\n");
  
  	cl_git_pass(git_buf_text_crlf_to_lf(&tgt, &src));
  	check_buf("\nlf\nlf\ncrlf\nlf\nlf\ncrlf\n", tgt);
  
  	/* LF in CRLF text */
  
  	git_buf_sets(&src, "\ncrlf\r\ncrlf\r\nlf\ncrlf\r\ncrlf");
  
  	cl_git_pass(git_buf_text_lf_to_crlf(&tgt, &src));
  	check_buf("\r\ncrlf\r\ncrlf\r\nlf\r\ncrlf\r\ncrlf", tgt);
  
  	cl_git_pass(git_buf_text_crlf_to_lf(&tgt, &src));
  	check_buf("\ncrlf\ncrlf\nlf\ncrlf\ncrlf", tgt);
  
  	/* bare CR test */
  
  	git_buf_sets(&src, "\rcrlf\r\nlf\nlf\ncr\rcrlf\r\nlf\ncr\r");
  
  	cl_git_pass(git_buf_text_lf_to_crlf(&tgt, &src));
  	check_buf("\rcrlf\r\nlf\r\nlf\r\ncr\rcrlf\r\nlf\r\ncr\r", tgt);
  
  	git_buf_sets(&src, "\rcrlf\r\nlf\nlf\ncr\rcrlf\r\nlf\ncr\r");
  
  	cl_git_pass(git_buf_text_crlf_to_lf(&tgt, &src));
  	check_buf("\rcrlf\nlf\nlf\ncr\rcrlf\nlf\ncr\r", tgt);
  
  	git_buf_sets(&src, "\rcr\r");
  	cl_git_pass(git_buf_text_lf_to_crlf(&tgt, &src));
  	check_buf(src.ptr, tgt);
  	cl_git_pass(git_buf_text_crlf_to_lf(&tgt, &src));
  	check_buf("\rcr\r", tgt);
  
  	git_buf_free(&src);
  	git_buf_free(&tgt);
  
  	/* blob correspondence tests */
  
  	git_buf_sets(&src, ALL_CRLF_TEXT_RAW);
  	cl_git_pass(git_buf_text_lf_to_crlf(&tgt, &src));
  	check_buf(ALL_CRLF_TEXT_AS_CRLF, tgt);
  	git_buf_sets(&src, ALL_CRLF_TEXT_RAW);
  	cl_git_pass(git_buf_text_crlf_to_lf(&tgt, &src));
  	check_buf(ALL_CRLF_TEXT_AS_LF, tgt);
  	git_buf_free(&src);
  	git_buf_free(&tgt);
  
  	git_buf_sets(&src, ALL_LF_TEXT_RAW);
  	cl_git_pass(git_buf_text_lf_to_crlf(&tgt, &src));
  	check_buf(ALL_LF_TEXT_AS_CRLF, tgt);
  	git_buf_sets(&src, ALL_LF_TEXT_RAW);
  	cl_git_pass(git_buf_text_crlf_to_lf(&tgt, &src));
  	check_buf(ALL_LF_TEXT_AS_LF, tgt);
  	git_buf_free(&src);
  	git_buf_free(&tgt);
  
  	git_buf_sets(&src, MORE_CRLF_TEXT_RAW);
  	cl_git_pass(git_buf_text_lf_to_crlf(&tgt, &src));
  	check_buf(MORE_CRLF_TEXT_AS_CRLF, tgt);
  	git_buf_sets(&src, MORE_CRLF_TEXT_RAW);
  	cl_git_pass(git_buf_text_crlf_to_lf(&tgt, &src));
  	check_buf(MORE_CRLF_TEXT_AS_LF, tgt);
  	git_buf_free(&src);
  	git_buf_free(&tgt);
  
  	git_buf_sets(&src, MORE_LF_TEXT_RAW);
  	cl_git_pass(git_buf_text_lf_to_crlf(&tgt, &src));
  	check_buf(MORE_LF_TEXT_AS_CRLF, tgt);
  	git_buf_sets(&src, MORE_LF_TEXT_RAW);
  	cl_git_pass(git_buf_text_crlf_to_lf(&tgt, &src));
  	check_buf(MORE_LF_TEXT_AS_LF, tgt);
  	git_buf_free(&src);
  	git_buf_free(&tgt);
  }
  
  void test_core_buffer__dont_grow_borrowed(void)
  {
  	const char *somestring = "blah blah";
  	git_buf buf = GIT_BUF_INIT;
  
  	git_buf_attach_notowned(&buf, somestring, strlen(somestring) + 1);
  	cl_assert_equal_p(somestring, buf.ptr);
  	cl_assert_equal_i(0, buf.asize);
  	cl_assert_equal_i(strlen(somestring) + 1, buf.size);
  
  	cl_git_fail_with(GIT_EINVALIDSPEC, git_buf_grow(&buf, 1024));
  }
  

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