2 * This file is part of FFmpeg.
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.
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.
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
25 #elif HAVE_MAPVIEWOFFILE
36 static const AVClass file_log_ctx_class = {
37 "FILE", av_default_item_name, NULL, LIBAVUTIL_VERSION_INT,
38 offsetof(FileLogContext, log_offset), offsetof(FileLogContext, log_ctx)
41 int av_file_map(const char *filename, uint8_t **bufptr, size_t *size,
42 int log_offset, void *log_ctx)
44 FileLogContext file_log_ctx = { &file_log_ctx_class, log_offset, log_ctx };
45 int err, fd = open(filename, O_RDONLY);
54 av_strerror(err, errbuf, sizeof(errbuf));
55 av_log(&file_log_ctx, AV_LOG_ERROR, "Cannot read file '%s': %s\n", filename, errbuf);
59 if (fstat(fd, &st) < 0) {
61 av_strerror(err, errbuf, sizeof(errbuf));
62 av_log(&file_log_ctx, AV_LOG_ERROR, "Error occurred in fstat(): %s\n", errbuf);
67 off_size = st.st_size;
68 if (off_size > SIZE_MAX) {
69 av_log(&file_log_ctx, AV_LOG_ERROR,
70 "File size for file '%s' is too big\n", filename);
72 return AVERROR(EINVAL);
77 ptr = mmap(NULL, *size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
78 if (ptr == MAP_FAILED) {
80 av_strerror(err, errbuf, sizeof(errbuf));
81 av_log(&file_log_ctx, AV_LOG_ERROR, "Error occurred in mmap(): %s\n", errbuf);
86 #elif HAVE_MAPVIEWOFFILE
88 HANDLE mh, fh = (HANDLE)_get_osfhandle(fd);
90 mh = CreateFileMapping(fh, NULL, PAGE_READONLY, 0, 0, NULL);
92 av_log(&file_log_ctx, AV_LOG_ERROR, "Error occurred in CreateFileMapping()\n");
97 ptr = MapViewOfFile(mh, FILE_MAP_READ, 0, 0, *size);
100 av_log(&file_log_ctx, AV_LOG_ERROR, "Error occurred in MapViewOfFile()\n");
108 *bufptr = av_malloc(*size);
110 av_log(&file_log_ctx, AV_LOG_ERROR, "Memory allocation error occurred\n");
112 return AVERROR(ENOMEM);
114 read(fd, *bufptr, *size);
121 void av_file_unmap(uint8_t *bufptr, size_t size)
124 munmap(bufptr, size);
125 #elif HAVE_MAPVIEWOFFILE
126 UnmapViewOfFile(bufptr);
140 if (av_file_map("file.c", &buf, &size, 0, NULL) < 0)
145 av_file_unmap(buf, size);