io.c (02.09.09)
exFAT file system implementation library.
- Copyright (C) 2010-2012 Andrew Nayenko
+ Free exFAT implementation.
+ Copyright (C) 2010-2013 Andrew Nayenko
- This program is free software: you can redistribute it and/or modify
+ This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
- the Free Software Foundation, either version 3 of the License, or
+ the Free Software Foundation, either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>.
+ You should have received a copy of the GNU General Public License along
+ with this program; if not, write to the Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "exfat.h"
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
+#include <errno.h>
#ifdef __APPLE__
#include <sys/disk.h>
#endif
#include <ublio.h>
#endif
-#if !defined(_FILE_OFFSET_BITS) || (_FILE_OFFSET_BITS != 64)
- #error You should define _FILE_OFFSET_BITS=64
-#endif
-
struct exfat_dev
{
int fd;
{
close(dev->fd);
free(dev);
- exfat_error("failed to get device size");
+ 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;
}
}
int exfat_close(struct exfat_dev* dev)
{
+ int rc = 0;
+
#ifdef USE_UBLIO
if (ublio_close(dev->ufh) != 0)
+ {
exfat_error("failed to close ublio");
+ rc = -EIO;
+ }
#endif
if (close(dev->fd) != 0)
{
- free(dev);
exfat_error("failed to close device");
- return 1;
+ rc = -EIO;
}
free(dev);
- return 0;
+ return rc;
}
int exfat_fsync(struct exfat_dev* dev)
{
+ int rc = 0;
+
#ifdef USE_UBLIO
if (ublio_fsync(dev->ufh) != 0)
-#else
- if (fsync(dev->fd) != 0)
+ {
+ exfat_error("ublio fsync failed");
+ rc = -EIO;
+ }
#endif
+ if (fsync(dev->fd) != 0)
{
exfat_error("fsync failed");
- return 1;
+ rc = -EIO;
}
- return 0;
+ return rc;
}
enum exfat_mode exfat_get_mode(const struct exfat_dev* dev)
#endif
}
-void exfat_pread(struct exfat_dev* dev, void* buffer, size_t size,
+ssize_t 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)
+ return ublio_pread(dev->ufh, buffer, size, offset);
#else
- if (pread(dev->fd, buffer, size, offset) != size)
+ return pread(dev->fd, buffer, size, offset);
#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,
+ssize_t 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)
+ return ublio_pwrite(dev->ufh, buffer, size, offset);
#else
- if (pwrite(dev->fd, buffer, size, offset) != size)
+ return pwrite(dev->fd, buffer, size, offset);
#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,
return -1;
}
lsize = MIN(CLUSTER_SIZE(*ef->sb) - loffset, remainder);
- exfat_pread(ef->dev, bufp, lsize, exfat_c2o(ef, cluster) + loffset);
+ if (exfat_pread(ef->dev, bufp, lsize,
+ exfat_c2o(ef, cluster) + loffset) < 0)
+ {
+ exfat_error("failed to read cluster %#x", cluster);
+ return -1;
+ }
bufp += lsize;
loffset = 0;
remainder -= lsize;
}
if (!ef->ro && !ef->noatime)
exfat_update_atime(node);
- return size - remainder;
+ return MIN(size, node->size - offset) - remainder;
}
ssize_t exfat_generic_pwrite(struct exfat* ef, struct exfat_node* node,
const char* bufp = buffer;
off_t lsize, loffset, remainder;
- if (offset + size > node->size)
- {
- int rc = exfat_truncate(ef, node, offset + size);
- if (rc != 0)
- return rc;
- }
+ if (offset > node->size)
+ if (exfat_truncate(ef, node, offset, true) != 0)
+ return -1;
+ if (offset + size > node->size)
+ if (exfat_truncate(ef, node, offset + size, false) != 0)
+ return -1;
if (size == 0)
return 0;
return -1;
}
lsize = MIN(CLUSTER_SIZE(*ef->sb) - loffset, remainder);
- exfat_pwrite(ef->dev, bufp, lsize, exfat_c2o(ef, cluster) + loffset);
+ if (exfat_pwrite(ef->dev, bufp, lsize,
+ exfat_c2o(ef, cluster) + loffset) < 0)
+ {
+ exfat_error("failed to write cluster %#x", cluster);
+ return -1;
+ }
bufp += lsize;
loffset = 0;
remainder -= lsize;
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