| 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 "file.h" |
| 21 | #include "internal.h" |
| 22 | #include "log.h" |
| 23 | #include "mem.h" |
| 24 | #include <fcntl.h> |
| 25 | #include <sys/stat.h> |
| 26 | #if HAVE_UNISTD_H |
| 27 | #include <unistd.h> |
| 28 | #endif |
| 29 | #if HAVE_IO_H |
| 30 | #include <io.h> |
| 31 | #endif |
| 32 | #if HAVE_MMAP |
| 33 | #include <sys/mman.h> |
| 34 | #elif HAVE_MAPVIEWOFFILE |
| 35 | #include <windows.h> |
| 36 | #endif |
| 37 | |
| 38 | typedef struct { |
| 39 | const AVClass *class; |
| 40 | int log_offset; |
| 41 | void *log_ctx; |
| 42 | } FileLogContext; |
| 43 | |
| 44 | static const AVClass file_log_ctx_class = { |
| 45 | "FILE", av_default_item_name, NULL, LIBAVUTIL_VERSION_INT, |
| 46 | offsetof(FileLogContext, log_offset), offsetof(FileLogContext, log_ctx) |
| 47 | }; |
| 48 | |
| 49 | int av_file_map(const char *filename, uint8_t **bufptr, size_t *size, |
| 50 | int log_offset, void *log_ctx) |
| 51 | { |
| 52 | FileLogContext file_log_ctx = { &file_log_ctx_class, log_offset, log_ctx }; |
| 53 | int err, fd = avpriv_open(filename, O_RDONLY); |
| 54 | struct stat st; |
| 55 | av_unused void *ptr; |
| 56 | off_t off_size; |
| 57 | char errbuf[128]; |
| 58 | *bufptr = NULL; |
| 59 | |
| 60 | if (fd < 0) { |
| 61 | err = AVERROR(errno); |
| 62 | av_strerror(err, errbuf, sizeof(errbuf)); |
| 63 | av_log(&file_log_ctx, AV_LOG_ERROR, "Cannot read file '%s': %s\n", filename, errbuf); |
| 64 | return err; |
| 65 | } |
| 66 | |
| 67 | if (fstat(fd, &st) < 0) { |
| 68 | err = AVERROR(errno); |
| 69 | av_strerror(err, errbuf, sizeof(errbuf)); |
| 70 | av_log(&file_log_ctx, AV_LOG_ERROR, "Error occurred in fstat(): %s\n", errbuf); |
| 71 | close(fd); |
| 72 | return err; |
| 73 | } |
| 74 | |
| 75 | off_size = st.st_size; |
| 76 | if (off_size > SIZE_MAX) { |
| 77 | av_log(&file_log_ctx, AV_LOG_ERROR, |
| 78 | "File size for file '%s' is too big\n", filename); |
| 79 | close(fd); |
| 80 | return AVERROR(EINVAL); |
| 81 | } |
| 82 | *size = off_size; |
| 83 | |
| 84 | #if HAVE_MMAP |
| 85 | ptr = mmap(NULL, *size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0); |
| 86 | if (ptr == MAP_FAILED) { |
| 87 | err = AVERROR(errno); |
| 88 | av_strerror(err, errbuf, sizeof(errbuf)); |
| 89 | av_log(&file_log_ctx, AV_LOG_ERROR, "Error occurred in mmap(): %s\n", errbuf); |
| 90 | close(fd); |
| 91 | return err; |
| 92 | } |
| 93 | *bufptr = ptr; |
| 94 | #elif HAVE_MAPVIEWOFFILE |
| 95 | { |
| 96 | HANDLE mh, fh = (HANDLE)_get_osfhandle(fd); |
| 97 | |
| 98 | mh = CreateFileMapping(fh, NULL, PAGE_READONLY, 0, 0, NULL); |
| 99 | if (!mh) { |
| 100 | av_log(&file_log_ctx, AV_LOG_ERROR, "Error occurred in CreateFileMapping()\n"); |
| 101 | close(fd); |
| 102 | return -1; |
| 103 | } |
| 104 | |
| 105 | ptr = MapViewOfFile(mh, FILE_MAP_READ, 0, 0, *size); |
| 106 | CloseHandle(mh); |
| 107 | if (!ptr) { |
| 108 | av_log(&file_log_ctx, AV_LOG_ERROR, "Error occurred in MapViewOfFile()\n"); |
| 109 | close(fd); |
| 110 | return -1; |
| 111 | } |
| 112 | |
| 113 | *bufptr = ptr; |
| 114 | } |
| 115 | #else |
| 116 | *bufptr = av_malloc(*size); |
| 117 | if (!*bufptr) { |
| 118 | av_log(&file_log_ctx, AV_LOG_ERROR, "Memory allocation error occurred\n"); |
| 119 | close(fd); |
| 120 | return AVERROR(ENOMEM); |
| 121 | } |
| 122 | read(fd, *bufptr, *size); |
| 123 | #endif |
| 124 | |
| 125 | close(fd); |
| 126 | return 0; |
| 127 | } |
| 128 | |
| 129 | void av_file_unmap(uint8_t *bufptr, size_t size) |
| 130 | { |
| 131 | #if HAVE_MMAP |
| 132 | munmap(bufptr, size); |
| 133 | #elif HAVE_MAPVIEWOFFILE |
| 134 | UnmapViewOfFile(bufptr); |
| 135 | #else |
| 136 | av_free(bufptr); |
| 137 | #endif |
| 138 | } |
| 139 | |
| 140 | int av_tempfile(const char *prefix, char **filename, int log_offset, void *log_ctx) |
| 141 | { |
| 142 | FileLogContext file_log_ctx = { &file_log_ctx_class, log_offset, log_ctx }; |
| 143 | int fd = -1; |
| 144 | #if !HAVE_MKSTEMP |
| 145 | void *ptr= tempnam(NULL, prefix); |
| 146 | if(!ptr) |
| 147 | ptr= tempnam(".", prefix); |
| 148 | *filename = av_strdup(ptr); |
| 149 | #undef free |
| 150 | free(ptr); |
| 151 | #else |
| 152 | size_t len = strlen(prefix) + 12; /* room for "/tmp/" and "XXXXXX\0" */ |
| 153 | *filename = av_malloc(len); |
| 154 | #endif |
| 155 | /* -----common section-----*/ |
| 156 | if (!*filename) { |
| 157 | av_log(&file_log_ctx, AV_LOG_ERROR, "ff_tempfile: Cannot allocate file name\n"); |
| 158 | return AVERROR(ENOMEM); |
| 159 | } |
| 160 | #if !HAVE_MKSTEMP |
| 161 | # ifndef O_BINARY |
| 162 | # define O_BINARY 0 |
| 163 | # endif |
| 164 | # ifndef O_EXCL |
| 165 | # define O_EXCL 0 |
| 166 | # endif |
| 167 | fd = open(*filename, O_RDWR | O_BINARY | O_CREAT | O_EXCL, 0600); |
| 168 | #else |
| 169 | snprintf(*filename, len, "/tmp/%sXXXXXX", prefix); |
| 170 | fd = mkstemp(*filename); |
| 171 | #ifdef _WIN32 |
| 172 | if (fd < 0) { |
| 173 | snprintf(*filename, len, "./%sXXXXXX", prefix); |
| 174 | fd = mkstemp(*filename); |
| 175 | } |
| 176 | #endif |
| 177 | #endif |
| 178 | /* -----common section-----*/ |
| 179 | if (fd < 0) { |
| 180 | int err = AVERROR(errno); |
| 181 | av_log(&file_log_ctx, AV_LOG_ERROR, "ff_tempfile: Cannot open temporary file %s\n", *filename); |
| 182 | av_freep(filename); |
| 183 | return err; |
| 184 | } |
| 185 | return fd; /* success */ |
| 186 | } |
| 187 | |
| 188 | #ifdef TEST |
| 189 | |
| 190 | #undef printf |
| 191 | |
| 192 | int main(void) |
| 193 | { |
| 194 | uint8_t *buf; |
| 195 | size_t size; |
| 196 | if (av_file_map("file.c", &buf, &size, 0, NULL) < 0) |
| 197 | return 1; |
| 198 | |
| 199 | buf[0] = 's'; |
| 200 | printf("%s", buf); |
| 201 | av_file_unmap(buf, size); |
| 202 | return 0; |
| 203 | } |
| 204 | #endif |
| 205 | |