Repository navigation
Expand file tree
/
Copy pathmz_os.c
More file actions
563 lines (446 loc) · 15 KB
/
Copy pathmz_os.c
File metadata and controls
563 lines (446 loc) · 15 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
/* mz_os.c -- System functions
part of the minizip-ng project
Copyright (C) Nathan Moinvaziri
https://github.com/zlib-ng/minizip-ng
Copyright (C) 1998-2010 Gilles Vollant
https://www.winimage.com/zLibDll/minizip.html
This program is distributed under the terms of the same license as zlib.
See the accompanying LICENSE file for the full text of the license.
*/
#include "mz.h"
#include "mz_crypt.h"
#include "mz_os.h"
#include "mz_strm.h"
#include "mz_strm_os.h"
#include <ctype.h> /* tolower */
#include <string.h>
/***************************************************************************/
int32_t mz_path_combine(char *path, const char *join, int32_t max_path) {
int32_t path_len = 0;
if (!path || !join || !max_path)
return MZ_PARAM_ERROR;
if (*path == 0) {
strncpy(path, join, max_path - 1);
path[max_path - 1] = 0;
} else {
mz_path_append_slash(path, max_path, MZ_PATH_SLASH_PLATFORM);
path_len = (int32_t)strlen(path);
if (max_path > path_len)
strncat(path, join, max_path - path_len - 1);
}
return MZ_OK;
}
int32_t mz_path_combine_safe(char *path, const char *join, int32_t max_path) {
if (!path || !join || !max_path)
return MZ_PARAM_ERROR;
/* Drop a drive letter and any leading separators so an absolute join stays under path */
#if defined(_WIN32)
if (*join != 0 && join[1] == ':' && isalpha((unsigned char)*join))
join += 2;
#endif
while (mz_os_is_dir_separator(*join))
join += 1;
if (*join == 0)
return MZ_EXIST_ERROR;
return mz_path_combine(path, join, max_path);
}
int32_t mz_path_append_slash(char *path, int32_t max_path, char slash) {
int32_t path_len = (int32_t)strlen(path);
if ((path_len + 2) >= max_path)
return MZ_BUF_ERROR;
if (!mz_os_is_dir_separator(path[path_len - 1])) {
path[path_len] = slash;
path[path_len + 1] = 0;
}
return MZ_OK;
}
int32_t mz_path_remove_slash(char *path) {
int32_t path_len = (int32_t)strlen(path);
while (path_len > 0) {
if (mz_os_is_dir_separator(path[path_len - 1]))
path[path_len - 1] = 0;
else
break;
path_len -= 1;
}
return MZ_OK;
}
int32_t mz_path_has_slash(const char *path) {
int32_t path_len = (int32_t)strlen(path);
if (path_len > 0 && !mz_os_is_dir_separator(path[path_len - 1]))
return MZ_EXIST_ERROR;
return MZ_OK;
}
int32_t mz_path_convert_slashes(char *path, char slash) {
int32_t i = 0;
for (i = 0; i < (int32_t)strlen(path); i += 1) {
if (mz_os_is_dir_separator(path[i]))
path[i] = slash;
}
return MZ_OK;
}
int32_t mz_path_compare_wc(const char *path, const char *wildcard, uint8_t ignore_case) {
while (*path != 0) {
switch (*wildcard) {
case '*':
if (*(wildcard + 1) == 0)
return MZ_OK;
while (*path != 0) {
if (mz_path_compare_wc(path, (wildcard + 1), ignore_case) == MZ_OK)
return MZ_OK;
path += 1;
}
return MZ_EXIST_ERROR;
default:
/* Ignore differences in path slashes on platforms */
if ((*path == '\\' && *wildcard == '/') || (*path == '/' && *wildcard == '\\'))
break;
if (ignore_case) {
if (tolower(*path) != tolower(*wildcard))
return MZ_EXIST_ERROR;
} else {
if (*path != *wildcard)
return MZ_EXIST_ERROR;
}
break;
}
path += 1;
wildcard += 1;
}
if ((*wildcard != 0) && (*wildcard != '*'))
return MZ_EXIST_ERROR;
return MZ_OK;
}
int32_t mz_path_resolve(const char *path, char *output, int32_t max_output) {
const char *source = path;
const char *check = output;
char *target = output;
if (max_output <= 0)
return MZ_PARAM_ERROR;
while (*source != 0 && max_output > 1) {
check = source;
if (mz_os_is_dir_separator(*check))
check += 1;
if (source == path || target == output || check != source) {
/* Skip double paths */
if (mz_os_is_dir_separator(*check)) {
source += 1;
continue;
}
if (*check == '.') {
check += 1;
/* Remove . if at end of string and not at the beginning */
if (*check == 0 && source != path && target != output) {
/* Copy last slash */
*target = *source;
target += 1;
max_output -= 1;
source += (check - source);
continue;
}
/* Remove . if not at end of string */
else if (mz_os_is_dir_separator(*check)) {
source += (check - source);
/* Skip slash if at beginning of string */
if (target == output && *source != 0)
source += 1;
continue;
}
/* Go to parent directory .. */
else if (*check == '.') {
check += 1;
if (*check == 0 || mz_os_is_dir_separator(*check)) {
source += (check - source);
/* Search backwards for previous slash or the start of the output string */
if (target != output) {
target -= 1;
do {
if (target == output || mz_os_is_dir_separator(*target))
break;
target -= 1;
max_output += 1;
} while (target > output);
}
if ((target == output) && *source != 0)
source += 1;
if (mz_os_is_dir_separator(*target) && *source == 0)
target += 1;
*target = 0;
continue;
}
}
}
}
*target = *source;
source += 1;
target += 1;
max_output -= 1;
}
*target = 0;
if (*path == 0)
return MZ_INTERNAL_ERROR;
return MZ_OK;
}
int32_t mz_path_remove_filename(char *path) {
char *path_ptr = NULL;
if (!path)
return MZ_PARAM_ERROR;
path_ptr = path + strlen(path) - 1;
while (path_ptr > path) {
if (mz_os_is_dir_separator(*path_ptr)) {
*path_ptr = 0;
break;
}
path_ptr -= 1;
}
if (path_ptr == path)
*path_ptr = 0;
return MZ_OK;
}
int32_t mz_path_remove_extension(char *path) {
char *path_ptr = NULL;
if (!path)
return MZ_PARAM_ERROR;
path_ptr = path + strlen(path) - 1;
while (path_ptr > path) {
if (mz_os_is_dir_separator(*path_ptr))
break;
if (*path_ptr == '.') {
*path_ptr = 0;
break;
}
path_ptr -= 1;
}
if (path_ptr == path)
*path_ptr = 0;
return MZ_OK;
}
int32_t mz_path_get_filename(const char *path, const char **filename) {
const char *match = NULL;
if (!path || !filename)
return MZ_PARAM_ERROR;
*filename = NULL;
for (match = path; *match != 0; match += 1) {
if (mz_os_is_dir_separator(*match))
*filename = match + 1;
}
if (!*filename)
return MZ_EXIST_ERROR;
return MZ_OK;
}
int32_t mz_path_is_symlink_target_safe(const char *link_path, const char *target, const char *base_path) {
char *combined = NULL;
char *resolved = NULL;
size_t max_path = 0;
size_t base_len = 0;
size_t parent_len = 0;
int32_t err = MZ_OK;
if (!link_path || !target || !base_path)
return MZ_PARAM_ERROR;
/* Absolute symlink targets are not allowed */
if (mz_os_is_dir_separator(target[0]))
return MZ_EXIST_ERROR;
base_len = strlen(base_path);
/* Remove trailing slash from base_path for comparison */
while (base_len > 0 && mz_os_is_dir_separator(base_path[base_len - 1]))
base_len--;
max_path = strlen(link_path) + strlen(target) + 2;
combined = (char *)calloc(1, max_path);
resolved = (char *)calloc(1, max_path);
if (!combined || !resolved) {
err = MZ_MEM_ERROR;
goto target_cleanup;
}
/* Find parent directory length by scanning backwards past filename and trailing slashes */
parent_len = strlen(link_path);
while (parent_len > 0 && !mz_os_is_dir_separator(link_path[parent_len - 1]))
parent_len--;
while (parent_len > 0 && mz_os_is_dir_separator(link_path[parent_len - 1]))
parent_len--;
/* Combine parent + target */
combined[0] = 0;
if (parent_len > 0) {
strncpy(combined, link_path, parent_len);
combined[parent_len] = 0;
mz_path_append_slash(combined, (int32_t)max_path, MZ_PATH_SLASH_PLATFORM);
}
strncat(combined, target, max_path - strlen(combined) - 1);
/* Resolve the combined path to eliminate .. */
if (mz_path_resolve(combined, resolved, (int32_t)max_path) != MZ_OK) {
err = MZ_EXIST_ERROR;
goto target_cleanup;
}
/* Check that resolved path stays within base_path */
if (strlen(resolved) < base_len || strncmp(resolved, base_path, base_len) != 0 ||
(resolved[base_len] != 0 && !mz_os_is_dir_separator(resolved[base_len])))
err = MZ_EXIST_ERROR;
target_cleanup:
free(combined);
free(resolved);
return err;
}
int32_t mz_dir_has_unsafe_symlink(const char *path, const char *base_path) {
char *check_path = NULL;
char *symlink_target = NULL;
size_t path_len = 0;
size_t base_len = 0;
int32_t max_path = 1024;
size_t pos = 0;
size_t cmp_len = 0;
int32_t err = MZ_OK;
if (!path || *path == 0 || !base_path)
return MZ_PARAM_ERROR;
path_len = strlen(path);
base_len = strlen(base_path);
/* Remove trailing slash from base_path for comparison */
while (base_len > 0 && mz_os_is_dir_separator(base_path[base_len - 1]))
base_len--;
check_path = (char *)calloc(1, path_len + 1);
if (!check_path)
return MZ_MEM_ERROR;
/* Walk through each path component */
while (err == MZ_OK && pos < path_len) {
/* Copy separator if present */
if (mz_os_is_dir_separator(path[pos])) {
check_path[pos] = path[pos];
pos++;
}
/* Copy next path component */
while (pos < path_len && !mz_os_is_dir_separator(path[pos])) {
check_path[pos] = path[pos];
pos++;
}
check_path[pos] = 0;
/* Check if this existing path component is a symlink */
if (mz_os_is_symlink(check_path) != MZ_OK)
continue;
/* Skip components at or above the base dir. */
cmp_len = pos;
if (mz_path_has_slash(check_path) == MZ_OK)
cmp_len--;
if (cmp_len <= base_len && strncmp(check_path, base_path, cmp_len) == 0) {
/* Verify that the prefix match is on a directory boundary. */
if (cmp_len == base_len || mz_os_is_dir_separator(base_path[cmp_len]))
continue;
}
/* Allocate symlink target buffer on first use */
if (!symlink_target) {
symlink_target = (char *)calloc(1, max_path);
if (!symlink_target) {
err = MZ_MEM_ERROR;
break;
}
}
if (mz_os_read_symlink(check_path, symlink_target, max_path) != MZ_OK) {
err = MZ_EXIST_ERROR;
break;
}
/* Reject the component if its symlink target escapes the base path */
err = mz_path_is_symlink_target_safe(check_path, symlink_target, base_path);
if (err != MZ_OK)
break;
}
free(check_path);
free(symlink_target);
return err;
}
int32_t mz_dir_make(const char *path) {
int32_t err = MZ_OK;
char *current_dir = NULL;
char *match = NULL;
char hold = 0;
if (!*path)
return MZ_OK;
current_dir = strdup(path);
if (!current_dir)
return MZ_MEM_ERROR;
mz_path_remove_slash(current_dir);
err = mz_os_make_dir(current_dir);
if (err != MZ_OK) {
match = current_dir + 1;
while (1) {
while (*match != 0 && !mz_os_is_dir_separator(*match))
match += 1;
hold = *match;
*match = 0;
err = mz_os_make_dir(current_dir);
if (err != MZ_OK)
break;
if (hold == 0)
break;
*match = hold;
match += 1;
}
}
free(current_dir);
return err;
}
int32_t mz_file_get_crc(const char *path, uint32_t *result_crc) {
void *stream = NULL;
uint32_t crc32 = 0;
int32_t read = 0;
int32_t err = MZ_OK;
uint8_t buf[16384];
stream = mz_stream_os_create();
if (!stream)
return MZ_MEM_ERROR;
err = mz_stream_os_open(stream, path, MZ_OPEN_MODE_READ);
if (err == MZ_OK) {
do {
read = mz_stream_os_read(stream, buf, sizeof(buf));
if (read < 0) {
err = read;
6E34
break;
}
crc32 = mz_crypt_crc32_update(crc32, buf, read);
} while ((err == MZ_OK) && (read > 0));
mz_stream_os_close(stream);
}
*result_crc = crc32;
mz_stream_os_delete(&stream);
return err;
}
/* Checks that a string is a valid utf8 byte sequence; rejects invalid lead and
continuation bytes, overlong encodings, surrogates, and code points beyond
U+10FFFF. */
int32_t mz_os_utf8_string_is_valid(const char *string) {
const uint8_t *s = (const uint8_t *)string;
uint32_t cp = 0;
uint32_t min_cp = 0;
int32_t trail = 0;
uint8_t c = 0;
if (!string)
return MZ_PARAM_ERROR;
while (*s != 0) {
c = *s++;
if (c < 0x80)
continue;
if ((c & 0xe0) == 0xc0) {
cp = c & 0x1f;
trail = 1;
min_cp = 0x80;
} else if ((c & 0xf0) == 0xe0) {
cp = c & 0x0f;
trail = 2;
min_cp = 0x800;
} else if ((c & 0xf8) == 0xf0) {
cp = c & 0x07;
trail = 3;
min_cp = 0x10000;
} else {
/* Invalid lead byte (0x80-0xbf continuation or 0xf8-0xff) */
return MZ_DATA_ERROR;
}
while (trail-- > 0) {
c = *s++;
if ((c & 0xc0) != 0x80)
return MZ_DATA_ERROR;
cp = (cp << 6) | (c & 0x3f);
}
/* Reject overlong encodings, surrogates, and out of range code points */
if (cp < min_cp || cp > 0x10ffff || (cp >= 0xd800 && cp <= 0xdfff))
return MZ_DATA_ERROR;
}
return MZ_OK;
}
/***************************************************************************/