+struct exfat_dev* exfat_open(const char* spec, enum exfat_mode mode)
+{
+ struct exfat_dev* dev;
+ struct stat stbuf;
+#ifdef USE_UBLIO
+ struct ublio_param up;
+#endif
+
+ dev = malloc(sizeof(struct exfat_dev));
+ if (dev == NULL)
+ {
+ exfat_error("failed to allocate memory for device structure");
+ return NULL;
+ }
+
+ switch (mode)
+ {
+ case EXFAT_MODE_RO:
+ dev->fd = open_ro(spec);
+ if (dev->fd == -1)
+ {
+ free(dev);
+ exfat_error("failed to open `%s' in read-only mode", spec);
+ return NULL;
+ }
+ dev->mode = EXFAT_MODE_RO;
+ break;
+ case EXFAT_MODE_RW:
+ dev->fd = open_rw(spec);
+ if (dev->fd == -1)
+ {
+ free(dev);
+ exfat_error("failed to open `%s' in read-write mode", spec);
+ return NULL;
+ }
+ dev->mode = EXFAT_MODE_RW;
+ break;
+ case EXFAT_MODE_ANY:
+ dev->fd = open_rw(spec);
+ if (dev->fd != -1)
+ {
+ dev->mode = EXFAT_MODE_RW;
+ break;
+ }
+ dev->fd = open_ro(spec);
+ if (dev->fd != -1)
+ {
+ dev->mode = EXFAT_MODE_RO;
+ exfat_warn("`%s' is write-protected, mounting read-only", spec);
+ break;
+ }
+ free(dev);
+ exfat_error("failed to open `%s'", spec);
+ return NULL;
+ }
+
+ if (fstat(dev->fd, &stbuf) != 0)
+ {
+ close(dev->fd);
+ free(dev);
+ exfat_error("failed to fstat `%s'", spec);
+ return NULL;
+ }
+ if (!S_ISBLK(stbuf.st_mode) &&
+ !S_ISCHR(stbuf.st_mode) &&
+ !S_ISREG(stbuf.st_mode))
+ {
+ close(dev->fd);
+ free(dev);
+ exfat_error("`%s' is neither a device, nor a regular file", spec);
+ return NULL;
+ }
+
+#ifdef __APPLE__
+ if (!S_ISREG(stbuf.st_mode))
+ {
+ uint32_t block_size = 0;
+ uint64_t blocks = 0;
+
+ if (ioctl(dev->fd, DKIOCGETBLOCKSIZE, &block_size) != 0)
+ {
+ close(dev->fd);
+ free(dev);
+ exfat_error("failed to get block size");
+ return NULL;
+ }
+ if (ioctl(dev->fd, DKIOCGETBLOCKCOUNT, &blocks) != 0)
+ {
+ close(dev->fd);
+ free(dev);
+ exfat_error("failed to get blocks count");
+ return NULL;
+ }
+ dev->size = blocks * block_size;
+ }
+ else
+#endif
+ {
+ /* works for Linux, FreeBSD, Solaris */
+ dev->size = exfat_seek(dev, 0, SEEK_END);
+ if (dev->size <= 0)
+ {
+ close(dev->fd);
+ free(dev);
+ exfat_error("failed to get size of `%s'", spec);
+ return NULL;
+ }
+ if (exfat_seek(dev, 0, SEEK_SET) == -1)
+ {
+ close(dev->fd);
+ free(dev);
+ exfat_error("failed to seek to the beginning of `%s'", spec);
+ return NULL;
+ }
+ }
+
+#ifdef USE_UBLIO
+ memset(&up, 0, sizeof(struct ublio_param));
+ up.up_blocksize = 256 * 1024;
+ up.up_items = 64;
+ up.up_grace = 32;
+ up.up_priv = &dev->fd;
+
+ dev->pos = 0;
+ dev->ufh = ublio_open(&up);
+ if (dev->ufh == NULL)
+ {
+ close(dev->fd);
+ free(dev);
+ exfat_error("failed to initialize ublio");
+ return NULL;
+ }
+#endif
+
+ return dev;
+}
+
+int exfat_close(struct exfat_dev* dev)
+{
+#ifdef USE_UBLIO
+ if (ublio_close(dev->ufh) != 0)
+ exfat_error("failed to close ublio");
+#endif
+ if (close(dev->fd) != 0)
+ {
+ free(dev);
+ exfat_error("failed to close device");
+ return 1;
+ }
+ free(dev);
+ return 0;
+}
+
+int exfat_fsync(struct exfat_dev* dev)
+{
+#ifdef USE_UBLIO
+ if (ublio_fsync(dev->ufh) != 0)
+#else
+ if (fsync(dev->fd) != 0)
+#endif
+ {
+ exfat_error("fsync failed");
+ return 1;
+ }
+ return 0;
+}
+
+enum exfat_mode exfat_get_mode(const struct exfat_dev* dev)
+{
+ return dev->mode;
+}
+
+off_t exfat_get_size(const struct exfat_dev* dev)
+{
+ return dev->size;
+}
+
+off_t exfat_seek(struct exfat_dev* dev, off_t offset, int whence)
+{
+#ifdef USE_UBLIO
+ /* XXX SEEK_CUR will be handled incorrectly */
+ return dev->pos = lseek(dev->fd, offset, whence);
+#else
+ return lseek(dev->fd, offset, whence);
+#endif
+}
+
+ssize_t exfat_read(struct exfat_dev* dev, void* buffer, size_t size)
+{
+#ifdef USE_UBLIO
+ ssize_t result = ublio_pread(dev->ufh, buffer, size, dev->pos);
+ if (result >= 0)
+ dev->pos += size;
+ return result;
+#else
+ return read(dev->fd, buffer, size);
+#endif
+}
+
+ssize_t exfat_write(struct exfat_dev* dev, const void* buffer, size_t size)
+{
+#ifdef USE_UBLIO
+ ssize_t result = ublio_pwrite(dev->ufh, buffer, size, dev->pos);
+ if (result >= 0)
+ dev->pos += size;
+ return result;
+#else
+ return write(dev->fd, buffer, size);
+#endif
+}
+
+void exfat_pread(struct exfat_dev* dev, void* buffer, size_t size,
+ off_t offset)
+{
+#ifdef USE_UBLIO
+ if (ublio_pread(dev->ufh, buffer, size, offset) != size)
+#else
+ if (pread(dev->fd, buffer, size, offset) != size)
+#endif
+ exfat_bug("failed to read %zu bytes from file at %"PRIu64, size,
+ (uint64_t) offset);
+}
+
+void exfat_pwrite(struct exfat_dev* dev, const void* buffer, size_t size,
+ off_t offset)
+{
+#ifdef USE_UBLIO
+ if (ublio_pwrite(dev->ufh, buffer, size, offset) != size)
+#else
+ if (pwrite(dev->fd, buffer, size, offset) != size)
+#endif
+ exfat_bug("failed to write %zu bytes to file at %"PRIu64, size,
+ (uint64_t) offset);
+}
+
+ssize_t exfat_generic_pread(const struct exfat* ef, struct exfat_node* node,