| Line | Branch | Exec | Source |
|---|---|---|---|
| 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 "error.h" | ||
| 21 | #include "file.h" | ||
| 22 | #include "file_open.h" | ||
| 23 | #include "internal.h" | ||
| 24 | #include "log.h" | ||
| 25 | #include "mem.h" | ||
| 26 | #include <fcntl.h> | ||
| 27 | #include <sys/stat.h> | ||
| 28 | #if HAVE_UNISTD_H | ||
| 29 | #include <unistd.h> | ||
| 30 | #endif | ||
| 31 | #if HAVE_IO_H | ||
| 32 | #include <io.h> | ||
| 33 | #endif | ||
| 34 | #if HAVE_MMAP | ||
| 35 | #include <sys/mman.h> | ||
| 36 | #elif HAVE_MAPVIEWOFFILE | ||
| 37 | #include <windows.h> | ||
| 38 | #endif | ||
| 39 | |||
| 40 | #ifdef _WIN32 | ||
| 41 | /* struct stat has a 32 bit st_size with the Windows SDK, use the 64 bit variants */ | ||
| 42 | #undef stat | ||
| 43 | #undef fstat | ||
| 44 | #define stat _stat64 | ||
| 45 | #define fstat _fstat64 | ||
| 46 | #endif | ||
| 47 | |||
| 48 | typedef struct FileLogContext { | ||
| 49 | const AVClass *class; | ||
| 50 | int log_offset; | ||
| 51 | void *log_ctx; | ||
| 52 | } FileLogContext; | ||
| 53 | |||
| 54 | static const AVClass file_log_ctx_class = { | ||
| 55 | .class_name = "FILE", | ||
| 56 | .item_name = av_default_item_name, | ||
| 57 | .option = NULL, | ||
| 58 | .version = LIBAVUTIL_VERSION_INT, | ||
| 59 | .log_level_offset_offset = offsetof(FileLogContext, log_offset), | ||
| 60 | .parent_log_context_offset = offsetof(FileLogContext, log_ctx), | ||
| 61 | }; | ||
| 62 | |||
| 63 | #if HAVE_MMAP || HAVE_MAPVIEWOFFILE | ||
| 64 | /* Map the first size bytes of the file, as a private copy or shared and | ||
| 65 | * writable. The shared mapping extends the file to size, on Windows the | ||
| 66 | * mapping object does it. */ | ||
| 67 | 8 | static int map_file(int fd, size_t size, int shared, void **ptr) | |
| 68 | { | ||
| 69 | #if HAVE_MMAP | ||
| 70 |
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8 | if (shared) { |
| 71 | struct stat st; | ||
| 72 | ✗ | if (fstat(fd, &st) < 0) | |
| 73 | ✗ | return AVERROR(errno); | |
| 74 | ✗ | if (st.st_size < size && ftruncate(fd, size) < 0) | |
| 75 | ✗ | return AVERROR(errno); | |
| 76 | } | ||
| 77 | |||
| 78 |
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8 | void *map = mmap(NULL, size, PROT_READ | PROT_WRITE, |
| 79 | shared ? MAP_SHARED : MAP_PRIVATE, fd, 0); | ||
| 80 |
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8 | if (map == MAP_FAILED) |
| 81 | ✗ | return AVERROR(errno); | |
| 82 | #else | ||
| 83 | HANDLE fh = (HANDLE)_get_osfhandle(fd); | ||
| 84 | if (fh == INVALID_HANDLE_VALUE) | ||
| 85 | return AVERROR(EBADF); | ||
| 86 | |||
| 87 | HANDLE mh = CreateFileMapping(fh, NULL, | ||
| 88 | shared ? PAGE_READWRITE : PAGE_READONLY, | ||
| 89 | (uint64_t)size >> 32, size, NULL); | ||
| 90 | if (!mh) | ||
| 91 | return AVERROR(EIO); | ||
| 92 | |||
| 93 | void *map = MapViewOfFile(mh, shared ? FILE_MAP_ALL_ACCESS : FILE_MAP_COPY, | ||
| 94 | 0, 0, size); | ||
| 95 | CloseHandle(mh); | ||
| 96 | if (!map) | ||
| 97 | return AVERROR(EIO); | ||
| 98 | #endif | ||
| 99 | |||
| 100 | 8 | *ptr = map; | |
| 101 | 8 | return 0; | |
| 102 | } | ||
| 103 | |||
| 104 | 8 | static void unmap_file(void *ptr, size_t size) | |
| 105 | { | ||
| 106 | #if HAVE_MMAP | ||
| 107 | 8 | munmap(ptr, size); | |
| 108 | #else | ||
| 109 | UnmapViewOfFile(ptr); | ||
| 110 | #endif | ||
| 111 | 8 | } | |
| 112 | #endif | ||
| 113 | |||
| 114 | 10 | int av_file_map(const char *filename, uint8_t **bufptr, size_t *size, | |
| 115 | int log_offset, void *log_ctx) | ||
| 116 | { | ||
| 117 | 10 | FileLogContext file_log_ctx = { &file_log_ctx_class, log_offset, log_ctx }; | |
| 118 | 10 | int err, fd = avpriv_open(filename, O_RDONLY); | |
| 119 | struct stat st; | ||
| 120 | av_unused void *ptr; | ||
| 121 | 10 | *bufptr = NULL; | |
| 122 | 10 | *size = 0; | |
| 123 | |||
| 124 |
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10 | if (fd < 0) { |
| 125 | 2 | err = AVERROR(errno); | |
| 126 | 2 | av_log(&file_log_ctx, AV_LOG_ERROR, "Cannot read file '%s': %s\n", filename, av_err2str(err)); | |
| 127 | 2 | return err; | |
| 128 | } | ||
| 129 | |||
| 130 |
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8 | if (fstat(fd, &st) < 0) { |
| 131 | ✗ | err = AVERROR(errno); | |
| 132 | ✗ | av_log(&file_log_ctx, AV_LOG_ERROR, "Error occurred in fstat(): %s\n", av_err2str(err)); | |
| 133 | ✗ | close(fd); | |
| 134 | ✗ | return err; | |
| 135 | } | ||
| 136 | |||
| 137 | if (st.st_size > SIZE_MAX) { | ||
| 138 | av_log(&file_log_ctx, AV_LOG_ERROR, | ||
| 139 | "File size for file '%s' is too big\n", filename); | ||
| 140 | close(fd); | ||
| 141 | return AVERROR(EINVAL); | ||
| 142 | } | ||
| 143 | 8 | *size = st.st_size; | |
| 144 | |||
| 145 |
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8 | if (!*size) { |
| 146 | ✗ | *bufptr = NULL; | |
| 147 | ✗ | goto out; | |
| 148 | } | ||
| 149 | |||
| 150 | #if HAVE_MMAP || HAVE_MAPVIEWOFFILE | ||
| 151 | 8 | err = map_file(fd, *size, 0, &ptr); | |
| 152 |
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8 | if (err < 0) { |
| 153 | ✗ | av_log(&file_log_ctx, AV_LOG_ERROR, "Cannot map file '%s': %s\n", filename, av_err2str(err)); | |
| 154 | ✗ | close(fd); | |
| 155 | ✗ | *size = 0; | |
| 156 | ✗ | return err; | |
| 157 | } | ||
| 158 | 8 | *bufptr = ptr; | |
| 159 | #else | ||
| 160 | *bufptr = av_malloc(*size); | ||
| 161 | if (!*bufptr) { | ||
| 162 | av_log(&file_log_ctx, AV_LOG_ERROR, "Memory allocation error occurred\n"); | ||
| 163 | close(fd); | ||
| 164 | *size = 0; | ||
| 165 | return AVERROR(ENOMEM); | ||
| 166 | } | ||
| 167 | read(fd, *bufptr, *size); | ||
| 168 | #endif | ||
| 169 | |||
| 170 | 8 | out: | |
| 171 | 8 | close(fd); | |
| 172 | 8 | return 0; | |
| 173 | } | ||
| 174 | |||
| 175 | 9 | void av_file_unmap(uint8_t *bufptr, size_t size) | |
| 176 | { | ||
| 177 |
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9 | if (!size || !bufptr) |
| 178 | 1 | return; | |
| 179 | #if HAVE_MMAP || HAVE_MAPVIEWOFFILE | ||
| 180 | 8 | unmap_file(bufptr, size); | |
| 181 | #else | ||
| 182 | av_free(bufptr); | ||
| 183 | #endif | ||
| 184 | } | ||
| 185 | |||
| 186 | ✗ | int av_file_map_shared(int fd, size_t size, void **bufptr) | |
| 187 | { | ||
| 188 | ✗ | *bufptr = NULL; | |
| 189 | ✗ | if (!size) | |
| 190 | ✗ | return AVERROR(EINVAL); | |
| 191 | #if HAVE_MMAP || HAVE_MAPVIEWOFFILE | ||
| 192 | ✗ | return map_file(fd, size, 1, bufptr); | |
| 193 | #else | ||
| 194 | return AVERROR(ENOSYS); | ||
| 195 | #endif | ||
| 196 | } | ||
| 197 | |||
| 198 | ✗ | void av_file_unmap_shared(void *bufptr, size_t size) | |
| 199 | { | ||
| 200 | #if HAVE_MMAP || HAVE_MAPVIEWOFFILE | ||
| 201 | ✗ | if (size && bufptr) | |
| 202 | ✗ | unmap_file(bufptr, size); | |
| 203 | #endif | ||
| 204 | ✗ | } | |
| 205 |