1 /*
2  * Copyright (c) 2018 Stefan Sperling <stsp@openbsd.org>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include <sys/queue.h>
18 
19 #include <stdio.h>
20 #include <stdlib.h>
21 #include <string.h>
22 #include <err.h>
23 #include <unistd.h>
24 
25 #include "got_error.h"
26 #include "got_opentemp.h"
27 
28 #include "got_lib_delta.h"
29 #include "got_lib_path.h"
30 
31 #ifndef nitems
32 #define nitems(_a) (sizeof(_a) / sizeof((_a)[0]))
33 #endif
34 
35 struct delta_test {
36 	const char *base;
37 	const char *delta;
38 	size_t delta_len;
39 	const char *expected;
40 } delta_tests[] = {
41 	/* base len 0, target len 4, append 4 'x' */
42 	{ "", "\x00\x04\x04xxxx", 7, "xxxx" },
43 	/* copy 4 bytes at offset 0 from base, append 4 'x' */
44 	{ "aabbccdd", "\x08\x08\x90\x04\x04xxxx", 9, "aabbxxxx" },
45 	/* copy 4 bytes at offset 4 from base, append 4 'x' */
46 	{ "aabbccdd", "\x08\x08\x91\x04\x04\x04xxxx", 10, "ccddxxxx" },
47 };
48 
49 static int
50 delta_apply()
51 {
52 	const struct got_error *err = NULL;
53 	int i;
54 	FILE *result_file;
55 
56 	result_file = got_opentemp();
57 	if (result_file == NULL)
58 		return 1;
59 
60 	for (i = 0; i < nitems(delta_tests); i++) {
61 		struct delta_test *dt = &delta_tests[i];
62 		FILE *base_file;
63 		char buf[1024];
64 		size_t n, len, result_len;
65 
66 		len = strlen(dt->base);
67 		base_file = got_opentemp();
68 		if (base_file == NULL) {
69 			err = got_error_from_errno();
70 			break;
71 		}
72 
73 		n = fwrite(dt->base, 1, len, base_file);
74 		if (n != len) {
75 			err = got_ferror(base_file, GOT_ERR_IO);
76 			break;
77 		}
78 		rewind(base_file);
79 
80 		err = got_delta_apply(base_file, dt->delta, dt->delta_len,
81 		    result_file, &len);
82 		fclose(base_file);
83 		if (err)
84 			break;
85 		result_len = strlen(dt->expected);
86 		if (result_len != len) {
87 			err = got_ferror(result_file, GOT_ERR_BAD_DELTA);
88 			break;
89 		}
90 		n = fread(buf, result_len, 1, result_file);
91 		if (n != 1 || strncmp(buf, dt->expected, result_len) != 0) {
92 			err = got_ferror(result_file, GOT_ERR_BAD_DELTA);
93 			break;
94 		}
95 		rewind(result_file);
96 	}
97 
98 	fclose(result_file);
99 	return (err == NULL);
100 }
101 
102 #define RUN_TEST(expr, name) \
103 	{ test_ok = (expr);  \
104 	printf("test %s %s\n", (name), test_ok ? "ok" : "failed"); \
105 	failure = (failure || !test_ok); }
106 
107 int
108 main(int argc, const char *argv[])
109 {
110 	int test_ok;
111 	int failure = 0;
112 
113 	if (argc != 1) {
114 		fprintf(stderr, "usage: delta_test [REPO_PATH]\n");
115 		return 1;
116 	}
117 
118 	if (pledge("stdio rpath wpath cpath", NULL) == -1)
119 		err(1, "pledge");
120 
121 	RUN_TEST(delta_apply(), "delta_apply");
122 
123 	return failure ? 1 : 0;
124 }