static int bochs_open(BlockDriverState *bs, const char *filename, int flags) { BDRVBochsState *s = bs->opaque; int fd, i; struct bochs_header bochs; struct bochs_header_v1 header_v1; fd = open(filename, O_RDWR | O_BINARY); if (fd < 0) { fd = open(filename, O_RDONLY | O_BINARY); if (fd < 0) return -1; } bs->read_only = 1; // no write support yet s->fd = fd; if (read(fd, &bochs, sizeof(bochs)) != sizeof(bochs)) { goto fail; } if (strcmp(bochs.magic, HEADER_MAGIC) || strcmp(bochs.type, REDOLOG_TYPE) || strcmp(bochs.subtype, GROWING_TYPE) || ((le32_to_cpu(bochs.version) != HEADER_VERSION) && (le32_to_cpu(bochs.version) != HEADER_V1))) { goto fail; } if (le32_to_cpu(bochs.version) == HEADER_V1) { memcpy(&header_v1, &bochs, sizeof(bochs)); bs->total_sectors = le64_to_cpu(header_v1.extra.redolog.disk) / 512; } else { bs->total_sectors = le64_to_cpu(bochs.extra.redolog.disk) / 512; } lseek(s->fd, le32_to_cpu(bochs.header), SEEK_SET); s->catalog_size = le32_to_cpu(bochs.extra.redolog.catalog); s->catalog_bitmap = qemu_malloc(s->catalog_size * 4); if (read(s->fd, s->catalog_bitmap, s->catalog_size * 4) != s->catalog_size * 4) goto fail; for (i = 0; i < s->catalog_size; i++) le32_to_cpus(&s->catalog_bitmap[i]); s->data_offset = le32_to_cpu(bochs.header) + (s->catalog_size * 4); s->bitmap_blocks = 1 + (le32_to_cpu(bochs.extra.redolog.bitmap) - 1) / 512; s->extent_blocks = 1 + (le32_to_cpu(bochs.extra.redolog.extent) - 1) / 512; s->extent_size = le32_to_cpu(bochs.extra.redolog.extent); return 0; fail: close(fd); return -1; }