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 = 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 ((int)(ptr) == -1) { 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; }