FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavutil/bprint.c
Date: 2025-10-27 14:11:36
Exec Total Coverage
Lines: 158 182 86.8%
Functions: 13 13 100.0%
Branches: 97 127 76.4%
Line Branch Exec Source
1 /*
2 * Copyright (c) 2012 Nicolas George
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 #include <limits.h>
22 #include <stdarg.h>
23 #include <stdio.h>
24 #include <string.h>
25 #include <time.h>
26 #include "avstring.h"
27 #include "bprint.h"
28 #include "compat/va_copy.h"
29 #include "error.h"
30 #include "macros.h"
31 #include "mem.h"
32
33 #define av_bprint_room(buf) ((buf)->size - FFMIN((buf)->len, (buf)->size))
34 #define av_bprint_is_allocated(buf) ((buf)->str != (buf)->reserved_internal_buffer)
35
36 67477 static int av_bprint_alloc(AVBPrint *buf, unsigned room)
37 {
38 char *old_str, *new_str;
39 unsigned min_size, new_size;
40
41
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 67477 if (buf->size == buf->size_max)
42 67304 return AVERROR(EIO);
43
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 173 if (!av_bprint_is_complete(buf))
44 ✗ return AVERROR_INVALIDDATA; /* it is already truncated anyway */
45 173 min_size = buf->len + 1 + FFMIN(UINT_MAX - buf->len - 1, room);
46
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 173 new_size = buf->size > buf->size_max / 2 ? buf->size_max : buf->size * 2;
47
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 173 if (new_size < min_size)
48 24 new_size = FFMIN(buf->size_max, min_size);
49
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 173 old_str = av_bprint_is_allocated(buf) ? buf->str : NULL;
50 173 new_str = av_realloc(old_str, new_size);
51
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 173 if (!new_str)
52 ✗ return AVERROR(ENOMEM);
53
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 173 if (!old_str)
54 76 memcpy(new_str, buf->str, buf->len + 1);
55 173 buf->str = new_str;
56 173 buf->size = new_size;
57 173 return 0;
58 }
59
60 14182000 static void av_bprint_grow(AVBPrint *buf, unsigned extra_len)
61 {
62 /* arbitrary margin to avoid small overflows */
63 14182000 extra_len = FFMIN(extra_len, UINT_MAX - 5 - buf->len);
64 14182000 buf->len += extra_len;
65
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 14182000 if (buf->size)
66 14115378 buf->str[FFMIN(buf->len, buf->size - 1)] = 0;
67 14182000 }
68
69 2545073 void av_bprint_init(AVBPrint *buf, unsigned size_init, unsigned size_max)
70 {
71 2545073 unsigned size_auto = (char *)buf + sizeof(*buf) -
72 buf->reserved_internal_buffer;
73
74
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 2545073 if (size_max == AV_BPRINT_SIZE_AUTOMATIC)
75 1874293 size_max = size_auto;
76 2545073 buf->str = buf->reserved_internal_buffer;
77 2545073 buf->len = 0;
78 2545073 buf->size = FFMIN(size_auto, size_max);
79 2545073 buf->size_max = size_max;
80 2545073 *buf->str = 0;
81
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 2545073 if (size_init > buf->size)
82 41 av_bprint_alloc(buf, size_init - 1);
83 2545073 }
84
85 29730 void av_bprint_init_for_buffer(AVBPrint *buf, char *buffer, unsigned size)
86 {
87
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 29730 if (size == 0) {
88 32 av_bprint_init(buf, 0, AV_BPRINT_SIZE_COUNT_ONLY);
89 32 return;
90 }
91
92 29698 buf->str = buffer;
93 29698 buf->len = 0;
94 29698 buf->size = size;
95 29698 buf->size_max = size;
96 29698 *buf->str = 0;
97 }
98
99 1745691 void av_vbprintf(AVBPrint *buf, const char *fmt, va_list vl_arg)
100 {
101 unsigned room;
102 char *dst;
103 int extra_len;
104 va_list vl;
105
106 while (1) {
107 1745708 room = av_bprint_room(buf);
108
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 1745708 dst = room ? buf->str + buf->len : NULL;
109 1745708 va_copy(vl, vl_arg);
110 1745708 extra_len = vsnprintf(dst, room, fmt, vl);
111 1745708 va_end(vl);
112
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 1745708 if (extra_len <= 0)
113 17122 return;
114
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 1728586 if (extra_len < room)
115 1727126 break;
116
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 1460 if (av_bprint_alloc(buf, extra_len))
117 1443 break;
118 }
119 1728569 av_bprint_grow(buf, extra_len);
120 }
121
122 1270114 void av_bprintf(AVBPrint *buf, const char *fmt, ...)
123 {
124 va_list vl;
125 1270114 va_start(vl, fmt);
126 1270114 av_vbprintf(buf, fmt, vl);
127 1270114 va_end(vl);
128 1270114 }
129
130 12209660 void av_bprint_chars(AVBPrint *buf, char c, unsigned n)
131 {
132 unsigned room, real_n;
133
134 while (1) {
135 12209660 room = av_bprint_room(buf);
136
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 12209660 if (n < room)
137 12143800 break;
138
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 65860 if (av_bprint_alloc(buf, n))
139 65860 break;
140 }
141
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 12209660 if (room) {
142 12143800 real_n = FFMIN(n, room - 1);
143 12143800 memset(buf->str + buf->len, c, real_n);
144 }
145 12209660 av_bprint_grow(buf, n);
146 12209660 }
147
148 243770 void av_bprint_append_data(AVBPrint *buf, const char *data, unsigned size)
149 {
150 unsigned room, real_n;
151
152 while (1) {
153 243873 room = av_bprint_room(buf);
154
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 243873 if (size < room)
155 243770 break;
156
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 103 if (av_bprint_alloc(buf, size))
157 ✗ break;
158 }
159
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 243770 if (room) {
160 243770 real_n = FFMIN(size, room - 1);
161 243770 memcpy(buf->str + buf->len, data, real_n);
162 }
163 243770 av_bprint_grow(buf, size);
164 243770 }
165
166 2 void av_bprint_strftime(AVBPrint *buf, const char *fmt, const struct tm *tm)
167 {
168 unsigned room;
169 size_t l;
170 2 size_t fmt_len = strlen(fmt);
171
172
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 2 if (!*fmt)
173 ✗ return;
174 while (1) {
175 2 room = av_bprint_room(buf);
176
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 2 if (room && (l = strftime(buf->str + buf->len, room, fmt, tm)))
177 1 break;
178
179 /* Due to the limitations of strftime() it is not possible to know if
180 * the output buffer is too small or the output is empty.
181 * However, a 256x output space requirement compared to the format
182 * string length is so unlikely we can safely assume empty output. This
183 * allows supporting possibly empty format strings like "%p". */
184
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 1 if (room >> 8 > fmt_len)
185 ✗ break;
186
187 /* strftime does not tell us how much room it would need: let us
188 retry with twice as much until the buffer is large enough */
189
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 1 room = !room ? fmt_len + 1 :
190 room <= INT_MAX / 2 ? room * 2 : INT_MAX;
191
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 1 if (av_bprint_alloc(buf, room)) {
192 /* impossible to grow, try to manage something useful anyway */
193 1 room = av_bprint_room(buf);
194
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 1 if (room < 1024) {
195 /* if strftime fails because the buffer has (almost) reached
196 its maximum size, let us try in a local buffer; 1k should
197 be enough to format any real date+time string */
198 char buf2[1024];
199
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 1 if ((l = strftime(buf2, sizeof(buf2), fmt, tm))) {
200 1 av_bprintf(buf, "%s", buf2);
201 1 return;
202 }
203 }
204 ✗ if (room) {
205 /* if anything else failed and the buffer is not already
206 truncated, let us add a stock string and force truncation */
207 static const char txt[] = "[truncated strftime output]";
208 ✗ memset(buf->str + buf->len, '!', room);
209 ✗ memcpy(buf->str + buf->len, txt, FFMIN(sizeof(txt) - 1, room));
210 ✗ av_bprint_grow(buf, room); /* force truncation */
211 }
212 ✗ return;
213 }
214 }
215 1 av_bprint_grow(buf, l);
216 }
217
218 18 void av_bprint_get_buffer(AVBPrint *buf, unsigned size,
219 unsigned char **mem, unsigned *actual_size)
220 {
221
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 18 if (size > av_bprint_room(buf))
222 12 av_bprint_alloc(buf, size);
223 18 *actual_size = av_bprint_room(buf);
224
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 18 *mem = *actual_size ? buf->str + buf->len : NULL;
225 18 }
226
227 85686 void av_bprint_clear(AVBPrint *buf)
228 {
229
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 85686 if (buf->len) {
230 61917 *buf->str = 0;
231 61917 buf->len = 0;
232 }
233 85686 }
234
235 778613 int av_bprint_finalize(AVBPrint *buf, char **ret_str)
236 {
237 778613 unsigned real_size = FFMIN(buf->len + 1, buf->size);
238 char *str;
239 778613 int ret = 0;
240
241
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 778613 if (ret_str) {
242
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 13150 if (av_bprint_is_allocated(buf)) {
243 69 str = av_realloc(buf->str, real_size);
244
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 69 if (!str)
245 ✗ str = buf->str;
246 69 buf->str = NULL;
247 } else {
248 13081 str = av_memdup(buf->str, real_size);
249
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 13081 if (!str)
250 ✗ ret = AVERROR(ENOMEM);
251 }
252 13150 *ret_str = str;
253 } else {
254
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 765463 if (av_bprint_is_allocated(buf))
255 10 av_freep(&buf->str);
256 }
257 778613 buf->size = real_size;
258 778613 return ret;
259 }
260
261 #define WHITESPACES " \n\t\r"
262
263 10519 void av_bprint_escape(AVBPrint *dstbuf, const char *src, const char *special_chars,
264 enum AVEscapeMode mode, int flags)
265 {
266 10519 const char *src0 = src;
267
268
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 10519 if (mode == AV_ESCAPE_MODE_AUTO)
269 ✗ mode = AV_ESCAPE_MODE_BACKSLASH; /* TODO: implement a heuristic */
270
271
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 10519 switch (mode) {
272 ✗ case AV_ESCAPE_MODE_QUOTE:
273 /* enclose the string between '' */
274 ✗ av_bprint_chars(dstbuf, '\'', 1);
275 ✗ for (; *src; src++) {
276 ✗ if (*src == '\'')
277 ✗ av_bprintf(dstbuf, "'\\''");
278 else
279 ✗ av_bprint_chars(dstbuf, *src, 1);
280 }
281 ✗ av_bprint_chars(dstbuf, '\'', 1);
282 ✗ break;
283
284 1293 case AV_ESCAPE_MODE_XML:
285 /* escape XML non-markup character data as per 2.4 by default: */
286 /* [^<&]* - ([^<&]* ']]>' [^<&]*) */
287
288 /* additionally, given one of the AV_ESCAPE_FLAG_XML_* flags, */
289 /* escape those specific characters as required. */
290
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 22498 for (; *src; src++) {
291
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 21205 switch (*src) {
292 2 case '&' : av_bprintf(dstbuf, "%s", "&amp;"); break;
293 17 case '<' : av_bprintf(dstbuf, "%s", "&lt;"); break;
294 12 case '>' : av_bprintf(dstbuf, "%s", "&gt;"); break;
295 39 case '\'':
296
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 39 if (!(flags & AV_ESCAPE_FLAG_XML_SINGLE_QUOTES))
297 39 goto XML_DEFAULT_HANDLING;
298
299 ✗ av_bprintf(dstbuf, "%s", "&apos;");
300 ✗ break;
301 4 case '"' :
302
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 4 if (!(flags & AV_ESCAPE_FLAG_XML_DOUBLE_QUOTES))
303 ✗ goto XML_DEFAULT_HANDLING;
304
305 4 av_bprintf(dstbuf, "%s", "&quot;");
306 4 break;
307 39 XML_DEFAULT_HANDLING:
308 21170 default: av_bprint_chars(dstbuf, *src, 1);
309 }
310 }
311 1293 break;
312
313 /* case AV_ESCAPE_MODE_BACKSLASH or unknown mode */
314 9226 default:
315 /* \-escape characters */
316
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 235804 for (; *src; src++) {
317
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 226578 int is_first_last = src == src0 || !*(src+1);
318 226578 int is_ws = !!strchr(WHITESPACES, *src);
319
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 226578 int is_strictly_special = special_chars && strchr(special_chars, *src);
320 226578 int is_special =
321
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 226604 is_strictly_special || strchr("'\\", *src) ||
322
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 26 (is_ws && (flags & AV_ESCAPE_FLAG_WHITESPACE));
323
324
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 226578 if (is_strictly_special ||
325
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 226510 (!(flags & AV_ESCAPE_FLAG_STRICT) &&
326
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 226460 (is_special || (is_ws && is_first_last))))
327 118 av_bprint_chars(dstbuf, '\\', 1);
328 226578 av_bprint_chars(dstbuf, *src, 1);
329 }
330 9226 break;
331 }
332 10519 }
333