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
|
/*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "config.h"
#include "file.h"
#include "internal.h"
#include "log.h"
#include "mem.h"
#include <fcntl.h>
#include <sys/stat.h>
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#if HAVE_IO_H
#include <io.h>
#endif
#if HAVE_MMAP
#include <sys/mman.h>
#elif HAVE_MAPVIEWOFFILE
#include <windows.h>
#endif
typedef struct {
const AVClass *class;
int log_offset;
void *log_ctx;
} FileLogContext;
static const AVClass file_log_ctx_class = {
"FILE", av_default_item_name, NULL, LIBAVUTIL_VERSION_INT,
offsetof(FileLogContext, log_offset), offsetof(FileLogContext, log_ctx)
};
int av_file_map(const char *filename, uint8_t **bufptr, size_t *size,
int log_offset, void *log_ctx)
{
FileLogContext file_log_ctx = { &file_log_ctx_class, log_offset, log_ctx };
int err, fd = avpriv_open(filename, O_RDONLY);
struct stat st;
av_unused void *ptr;
off_t off_size;
char errbuf[128];
*bufptr = NULL;
if (fd < 0) {
err = AVERROR(errno);
av_strerror(err, errbuf, sizeof(errbuf));
av_log(&file_log_ctx, AV_LOG_ERROR, "Cannot read file '%s': %s\n", filename, errbuf);
return err;
}
if (fstat(fd, &st) < 0) {
err = AVERROR(errno);
av_strerror(err, errbuf, sizeof(errbuf));
av_log(&file_log_ctx, AV_LOG_ERROR, "Error occurred in fstat(): %s\n", errbuf);
close(fd);
return err;
}
off_size = st.st_size;
if (off_size > SIZE_MAX) {
av_log(&file_log_ctx, AV_LOG_ERROR,
"File size for file '%s' is too big\n", filename);
close(fd);
return AVERROR(EINVAL);
}
*size = off_size;
#if HAVE_MMAP
ptr = mmap(NULL, *size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
if (ptr == MAP_FAILED) {
err = AVERROR(errno);
av_strerror(err, errbuf, sizeof(errbuf));
av_log(&file_log_ctx, AV_LOG_ERROR, "Error occurred in mmap(): %s\n", errbuf);
close(fd);
return err;
}
*bufptr = ptr;
#elif HAVE_MAPVIEWOFFILE
{
HANDLE mh, fh = (HANDLE)_get_osfhandle(fd);
mh = CreateFileMapping(fh, NULL, PAGE_READONLY, 0, 0, NULL);
if (!mh) {
av_log(&file_log_ctx, AV_LOG_ERROR, "Error occurred in CreateFileMapping()\n");
close(fd);
return -1;
}
ptr = MapViewOfFile(mh, FILE_MAP_READ, 0, 0, *size);
CloseHandle(mh);
if (!ptr) {
av_log(&file_log_ctx, AV_LOG_ERROR, "Error occurred in MapViewOfFile()\n");
close(fd);
return -1;
}
*bufptr = ptr;
}
#else
*bufptr = av_malloc(*size);
if (!*bufptr) {
av_log(&file_log_ctx, AV_LOG_ERROR, "Memory allocation error occurred\n");
close(fd);
return AVERROR(ENOMEM);
}
read(fd, *bufptr, *size);
#endif
close(fd);
return 0;
}
void av_file_unmap(uint8_t *bufptr, size_t size)
{
#if HAVE_MMAP
munmap(bufptr, size);
#elif HAVE_MAPVIEWOFFILE
UnmapViewOfFile(bufptr);
#else
av_free(bufptr);
#endif
}
int av_tempfile(const char *prefix, char **filename, int log_offset, void *log_ctx)
{
FileLogContext file_log_ctx = { &file_log_ctx_class, log_offset, log_ctx };
int fd = -1;
#if !HAVE_MKSTEMP
void *ptr= tempnam(NULL, prefix);
if(!ptr)
ptr= tempnam(".", prefix);
*filename = av_strdup(ptr);
#undef free
free(ptr);
#else
size_t len = strlen(prefix) + 12; /* room for "/tmp/" and "XXXXXX\0" */
*filename = av_malloc(len);
#endif
/* -----common section-----*/
if (!*filename) {
av_log(&file_log_ctx, AV_LOG_ERROR, "ff_tempfile: Cannot allocate file name\n");
return AVERROR(ENOMEM);
}
#if !HAVE_MKSTEMP
# ifndef O_BINARY
# define O_BINARY 0
# endif
# ifndef O_EXCL
# define O_EXCL 0
# endif
fd = open(*filename, O_RDWR | O_BINARY | O_CREAT | O_EXCL, 0600);
#else
snprintf(*filename, len, "/tmp/%sXXXXXX", prefix);
fd = mkstemp(*filename);
#ifdef _WIN32
if (fd < 0) {
snprintf(*filename, len, "./%sXXXXXX", prefix);
fd = mkstemp(*filename);
}
#endif
#endif
/* -----common section-----*/
if (fd < 0) {
int err = AVERROR(errno);
av_log(&file_log_ctx, AV_LOG_ERROR, "ff_tempfile: Cannot open temporary file %s\n", *filename);
av_freep(filename);
return err;
}
return fd; /* success */
}
#ifdef TEST
#undef printf
int main(void)
{
uint8_t *buf;
size_t size;
if (av_file_map("file.c", &buf, &size, 0, NULL) < 0)
return 1;
buf[0] = 's';
printf("%s", buf);
av_file_unmap(buf, size);
return 0;
}
#endif
|
