xref: /third_party/ffmpeg/libavutil/file_open.c (revision cabdff1a) 
1/*
2 * This file is part of FFmpeg.
3 *
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19#include "config.h"
20#include "internal.h"
21#include "mem.h"
22#include <stdarg.h>
23#include <fcntl.h>
24#include <sys/stat.h>
25#if HAVE_UNISTD_H
26#include <unistd.h>
27#endif
28#if HAVE_IO_H
29#include <io.h>
30#endif
31
32#ifdef _WIN32
33#undef open
34#undef lseek
35#undef stat
36#undef fstat
37#include <windows.h>
38#include <share.h>
39#include <errno.h>
40#include "wchar_filename.h"
41
42static int win32_open(const char *filename_utf8, int oflag, int pmode)
43{
44    int fd;
45    wchar_t *filename_w;
46
47    /* convert UTF-8 to wide chars */
48    if (get_extended_win32_path(filename_utf8, &filename_w))
49        return -1;
50    if (!filename_w)
51        goto fallback;
52
53    fd = _wsopen(filename_w, oflag, SH_DENYNO, pmode);
54    av_freep(&filename_w);
55
56    if (fd != -1 || (oflag & O_CREAT))
57        return fd;
58
59fallback:
60    /* filename may be in CP_ACP */
61    return _sopen(filename_utf8, oflag, SH_DENYNO, pmode);
62}
63#define open win32_open
64#endif
65
66int avpriv_open(const char *filename, int flags, ...)
67{
68    int fd;
69    unsigned int mode = 0;
70    va_list ap;
71
72    va_start(ap, flags);
73    if (flags & O_CREAT)
74        mode = va_arg(ap, unsigned int);
75    va_end(ap);
76
77#ifdef O_CLOEXEC
78    flags |= O_CLOEXEC;
79#endif
80#ifdef O_NOINHERIT
81    flags |= O_NOINHERIT;
82#endif
83
84    fd = open(filename, flags, mode);
85#if HAVE_FCNTL
86    if (fd != -1) {
87        if (fcntl(fd, F_SETFD, FD_CLOEXEC) == -1)
88            av_log(NULL, AV_LOG_DEBUG, "Failed to set close on exec\n");
89    }
90#endif
91
92    return fd;
93}
94
95typedef struct FileLogContext {
96    const AVClass *class;
97    int   log_offset;
98    void *log_ctx;
99} FileLogContext;
100
101static const AVClass file_log_ctx_class = {
102    .class_name                = "TEMPFILE",
103    .item_name                 = av_default_item_name,
104    .option                    = NULL,
105    .version                   = LIBAVUTIL_VERSION_INT,
106    .log_level_offset_offset   = offsetof(FileLogContext, log_offset),
107    .parent_log_context_offset = offsetof(FileLogContext, log_ctx),
108};
109
110int avpriv_tempfile(const char *prefix, char **filename, int log_offset, void *log_ctx)
111{
112    FileLogContext file_log_ctx = { &file_log_ctx_class, log_offset, log_ctx };
113    int fd = -1;
114#if !HAVE_MKSTEMP
115    void *ptr= tempnam(NULL, prefix);
116    if(!ptr)
117        ptr= tempnam(".", prefix);
118    *filename = av_strdup(ptr);
119#undef free
120    free(ptr);
121#else
122    size_t len = strlen(prefix) + 12; /* room for "/tmp/" and "XXXXXX\0" */
123    *filename  = av_malloc(len);
124#endif
125    /* -----common section-----*/
126    if (!*filename) {
127        av_log(&file_log_ctx, AV_LOG_ERROR, "ff_tempfile: Cannot allocate file name\n");
128        return AVERROR(ENOMEM);
129    }
130#if !HAVE_MKSTEMP
131#   ifndef O_BINARY
132#       define O_BINARY 0
133#   endif
134#   ifndef O_EXCL
135#       define O_EXCL 0
136#   endif
137    fd = open(*filename, O_RDWR | O_BINARY | O_CREAT | O_EXCL, 0600);
138#else
139    snprintf(*filename, len, "/tmp/%sXXXXXX", prefix);
140    fd = mkstemp(*filename);
141#if defined(_WIN32) || defined (__ANDROID__) || defined(__DJGPP__)
142    if (fd < 0) {
143        snprintf(*filename, len, "./%sXXXXXX", prefix);
144        fd = mkstemp(*filename);
145    }
146#endif
147#endif
148    /* -----common section-----*/
149    if (fd < 0) {
150        int err = AVERROR(errno);
151        av_log(&file_log_ctx, AV_LOG_ERROR, "ff_tempfile: Cannot open temporary file %s\n", *filename);
152        av_freep(filename);
153        return err;
154    }
155    return fd; /* success */
156}
157
158FILE *avpriv_fopen_utf8(const char *path, const char *mode)
159{
160    int fd;
161    int access;
162    const char *m = mode;
163
164    switch (*m++) {
165    case 'r': access = O_RDONLY; break;
166    case 'w': access = O_CREAT|O_WRONLY|O_TRUNC; break;
167    case 'a': access = O_CREAT|O_WRONLY|O_APPEND; break;
168    default :
169        errno = EINVAL;
170        return NULL;
171    }
172    while (*m) {
173        if (*m == '+') {
174            access &= ~(O_RDONLY | O_WRONLY);
175            access |= O_RDWR;
176        } else if (*m == 'b') {
177#ifdef O_BINARY
178            access |= O_BINARY;
179#endif
180        } else if (*m) {
181            errno = EINVAL;
182            return NULL;
183        }
184        m++;
185    }
186    fd = avpriv_open(path, access, 0666);
187    if (fd == -1)
188        return NULL;
189    return fdopen(fd, mode);
190}
191
192#if FF_API_AV_FOPEN_UTF8
193FILE *av_fopen_utf8(const char *path, const char *mode)
194{
195    return avpriv_fopen_utf8(path, mode);
196}
197#endif
198