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611 lines
17 KiB
C
611 lines
17 KiB
C
/*
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fatdir.c
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Functions used by the newlib disc stubs to interface with
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this library
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Copyright (c) 2006 Michael "Chishm" Chisholm
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Redistribution and use in source and binary forms, with or without modification,
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are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation and/or
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other materials provided with the distribution.
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3. The name of the author may not be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <string.h>
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#include <errno.h>
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#include <ctype.h>
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#include <unistd.h>
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#include <sys/dir.h>
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#include "fatdir.h"
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#include "cache.h"
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#include "file_allocation_table.h"
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#include "partition.h"
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#include "directory.h"
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#include "bit_ops.h"
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#include "filetime.h"
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#include "lock.h"
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int _FAT_stat_r (struct _reent *r, const char *path, struct stat *st) {
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PARTITION* partition = NULL;
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DIR_ENTRY dirEntry;
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// Get the partition this file is on
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partition = _FAT_partition_getPartitionFromPath (path);
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if (partition == NULL) {
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r->_errno = ENODEV;
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return -1;
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}
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// Move the path pointer to the start of the actual path
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if (strchr (path, ':') != NULL) {
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path = strchr (path, ':') + 1;
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}
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if (strchr (path, ':') != NULL) {
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r->_errno = EINVAL;
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return -1;
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}
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_FAT_lock(&partition->lock);
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// Search for the file on the disc
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if (!_FAT_directory_entryFromPath (partition, &dirEntry, path, NULL)) {
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_FAT_unlock(&partition->lock);
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r->_errno = ENOENT;
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return -1;
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}
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// Fill in the stat struct
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_FAT_directory_entryStat (partition, &dirEntry, st);
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_FAT_unlock(&partition->lock);
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return 0;
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}
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int _FAT_link_r (struct _reent *r, const char *existing, const char *newLink) {
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r->_errno = ENOTSUP;
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return -1;
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}
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int _FAT_unlink_r (struct _reent *r, const char *path) {
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PARTITION* partition = NULL;
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DIR_ENTRY dirEntry;
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DIR_ENTRY dirContents;
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uint32_t cluster;
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bool nextEntry;
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bool errorOccured = false;
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// Get the partition this directory is on
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partition = _FAT_partition_getPartitionFromPath (path);
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if (partition == NULL) {
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r->_errno = ENODEV;
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return -1;
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}
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// Make sure we aren't trying to write to a read-only disc
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if (partition->readOnly) {
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r->_errno = EROFS;
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return -1;
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}
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// Move the path pointer to the start of the actual path
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if (strchr (path, ':') != NULL) {
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path = strchr (path, ':') + 1;
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}
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if (strchr (path, ':') != NULL) {
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r->_errno = EINVAL;
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return -1;
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}
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_FAT_lock(&partition->lock);
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// Search for the file on the disc
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if (!_FAT_directory_entryFromPath (partition, &dirEntry, path, NULL)) {
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_FAT_unlock(&partition->lock);
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r->_errno = ENOENT;
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return -1;
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}
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cluster = _FAT_directory_entryGetCluster (partition, dirEntry.entryData);
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// If this is a directory, make sure it is empty
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if (_FAT_directory_isDirectory (&dirEntry)) {
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nextEntry = _FAT_directory_getFirstEntry (partition, &dirContents, cluster);
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while (nextEntry) {
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if (!_FAT_directory_isDot (&dirContents)) {
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// The directory had something in it that isn't a reference to itself or it's parent
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_FAT_unlock(&partition->lock);
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r->_errno = EPERM;
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return -1;
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}
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nextEntry = _FAT_directory_getNextEntry (partition, &dirContents);
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}
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}
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if (_FAT_fat_isValidCluster(partition, cluster)) {
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// Remove the cluster chain for this file
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if (!_FAT_fat_clearLinks (partition, cluster)) {
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r->_errno = EIO;
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errorOccured = true;
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}
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}
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// Remove the directory entry for this file
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if (!_FAT_directory_removeEntry (partition, &dirEntry)) {
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r->_errno = EIO;
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errorOccured = true;
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}
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// Flush any sectors in the disc cache
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if (!_FAT_cache_flush(partition->cache)) {
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r->_errno = EIO;
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errorOccured = true;
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}
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_FAT_unlock(&partition->lock);
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if (errorOccured) {
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return -1;
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} else {
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return 0;
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}
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}
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int _FAT_chdir_r (struct _reent *r, const char *path) {
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PARTITION* partition = NULL;
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// Get the partition this directory is on
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partition = _FAT_partition_getPartitionFromPath (path);
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if (partition == NULL) {
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r->_errno = ENODEV;
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return -1;
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}
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// Move the path pointer to the start of the actual path
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if (strchr (path, ':') != NULL) {
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path = strchr (path, ':') + 1;
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}
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if (strchr (path, ':') != NULL) {
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r->_errno = EINVAL;
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return -1;
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}
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_FAT_lock(&partition->lock);
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// Try changing directory
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if (_FAT_directory_chdir (partition, path)) {
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// Successful
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_FAT_unlock(&partition->lock);
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return 0;
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} else {
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// Failed
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_FAT_unlock(&partition->lock);
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r->_errno = ENOTDIR;
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return -1;
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}
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}
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int _FAT_rename_r (struct _reent *r, const char *oldName, const char *newName) {
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PARTITION* partition = NULL;
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DIR_ENTRY oldDirEntry;
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DIR_ENTRY newDirEntry;
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const char *pathEnd;
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uint32_t dirCluster;
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// Get the partition this directory is on
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partition = _FAT_partition_getPartitionFromPath (oldName);
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if (partition == NULL) {
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r->_errno = ENODEV;
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return -1;
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}
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_FAT_lock(&partition->lock);
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// Make sure the same partition is used for the old and new names
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if (partition != _FAT_partition_getPartitionFromPath (newName)) {
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_FAT_unlock(&partition->lock);
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r->_errno = EXDEV;
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return -1;
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}
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// Make sure we aren't trying to write to a read-only disc
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if (partition->readOnly) {
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_FAT_unlock(&partition->lock);
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r->_errno = EROFS;
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return -1;
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}
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// Move the path pointer to the start of the actual path
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if (strchr (oldName, ':') != NULL) {
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oldName = strchr (oldName, ':') + 1;
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}
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if (strchr (oldName, ':') != NULL) {
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_FAT_unlock(&partition->lock);
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r->_errno = EINVAL;
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return -1;
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}
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if (strchr (newName, ':') != NULL) {
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newName = strchr (newName, ':') + 1;
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}
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if (strchr (newName, ':') != NULL) {
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_FAT_unlock(&partition->lock);
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r->_errno = EINVAL;
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return -1;
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}
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// Search for the file on the disc
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if (!_FAT_directory_entryFromPath (partition, &oldDirEntry, oldName, NULL)) {
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_FAT_unlock(&partition->lock);
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r->_errno = ENOENT;
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return -1;
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}
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// Make sure there is no existing file / directory with the new name
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if (_FAT_directory_entryFromPath (partition, &newDirEntry, newName, NULL)) {
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_FAT_unlock(&partition->lock);
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r->_errno = EEXIST;
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return -1;
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}
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// Create the new file entry
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// Get the directory it has to go in
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pathEnd = strrchr (newName, DIR_SEPARATOR);
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if (pathEnd == NULL) {
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// No path was specified
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dirCluster = partition->cwdCluster;
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pathEnd = newName;
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} else {
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// Path was specified -- get the right dirCluster
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// Recycling newDirEntry, since it needs to be recreated anyway
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if (!_FAT_directory_entryFromPath (partition, &newDirEntry, newName, pathEnd) ||
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!_FAT_directory_isDirectory(&newDirEntry)) {
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_FAT_unlock(&partition->lock);
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r->_errno = ENOTDIR;
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return -1;
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}
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dirCluster = _FAT_directory_entryGetCluster (partition, newDirEntry.entryData);
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// Move the pathEnd past the last DIR_SEPARATOR
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pathEnd += 1;
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}
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// Copy the entry data
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memcpy (&newDirEntry, &oldDirEntry, sizeof(DIR_ENTRY));
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// Set the new name
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strncpy (newDirEntry.filename, pathEnd, MAX_FILENAME_LENGTH - 1);
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// Write the new entry
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if (!_FAT_directory_addEntry (partition, &newDirEntry, dirCluster)) {
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_FAT_unlock(&partition->lock);
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r->_errno = ENOSPC;
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return -1;
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}
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// Remove the old entry
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if (!_FAT_directory_removeEntry (partition, &oldDirEntry)) {
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_FAT_unlock(&partition->lock);
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r->_errno = EIO;
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return -1;
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}
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// Flush any sectors in the disc cache
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if (!_FAT_cache_flush (partition->cache)) {
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_FAT_unlock(&partition->lock);
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r->_errno = EIO;
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return -1;
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}
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_FAT_unlock(&partition->lock);
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return 0;
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}
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int _FAT_mkdir_r (struct _reent *r, const char *path, int mode) {
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PARTITION* partition = NULL;
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bool fileExists;
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DIR_ENTRY dirEntry;
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const char* pathEnd;
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uint32_t parentCluster, dirCluster;
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uint8_t newEntryData[DIR_ENTRY_DATA_SIZE];
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partition = _FAT_partition_getPartitionFromPath (path);
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if (partition == NULL) {
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r->_errno = ENODEV;
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return -1;
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}
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// Move the path pointer to the start of the actual path
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if (strchr (path, ':') != NULL) {
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path = strchr (path, ':') + 1;
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}
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if (strchr (path, ':') != NULL) {
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r->_errno = EINVAL;
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return -1;
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}
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_FAT_lock(&partition->lock);
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// Search for the file/directory on the disc
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fileExists = _FAT_directory_entryFromPath (partition, &dirEntry, path, NULL);
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// Make sure it doesn't exist
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if (fileExists) {
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_FAT_unlock(&partition->lock);
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r->_errno = EEXIST;
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return -1;
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}
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if (partition->readOnly) {
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// We can't write to a read-only partition
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_FAT_unlock(&partition->lock);
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r->_errno = EROFS;
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return -1;
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}
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// Get the directory it has to go in
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pathEnd = strrchr (path, DIR_SEPARATOR);
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if (pathEnd == NULL) {
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// No path was specified
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parentCluster = partition->cwdCluster;
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pathEnd = path;
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} else {
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// Path was specified -- get the right parentCluster
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// Recycling dirEntry, since it needs to be recreated anyway
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if (!_FAT_directory_entryFromPath (partition, &dirEntry, path, pathEnd) ||
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!_FAT_directory_isDirectory(&dirEntry)) {
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_FAT_unlock(&partition->lock);
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r->_errno = ENOTDIR;
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return -1;
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}
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parentCluster = _FAT_directory_entryGetCluster (partition, dirEntry.entryData);
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// Move the pathEnd past the last DIR_SEPARATOR
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pathEnd += 1;
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}
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// Create the entry data
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strncpy (dirEntry.filename, pathEnd, MAX_FILENAME_LENGTH - 1);
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memset (dirEntry.entryData, 0, DIR_ENTRY_DATA_SIZE);
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// Set the creation time and date
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dirEntry.entryData[DIR_ENTRY_cTime_ms] = 0;
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u16_to_u8array (dirEntry.entryData, DIR_ENTRY_cTime, _FAT_filetime_getTimeFromRTC());
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u16_to_u8array (dirEntry.entryData, DIR_ENTRY_cDate, _FAT_filetime_getDateFromRTC());
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u16_to_u8array (dirEntry.entryData, DIR_ENTRY_mTime, _FAT_filetime_getTimeFromRTC());
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u16_to_u8array (dirEntry.entryData, DIR_ENTRY_mDate, _FAT_filetime_getDateFromRTC());
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u16_to_u8array (dirEntry.entryData, DIR_ENTRY_aDate, _FAT_filetime_getDateFromRTC());
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// Set the directory attribute
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dirEntry.entryData[DIR_ENTRY_attributes] = ATTRIB_DIR;
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// Get a cluster for the new directory
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dirCluster = _FAT_fat_linkFreeClusterCleared (partition, CLUSTER_FREE);
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if (!_FAT_fat_isValidCluster(partition, dirCluster)) {
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// No space left on disc for the cluster
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_FAT_unlock(&partition->lock);
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r->_errno = ENOSPC;
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return -1;
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}
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u16_to_u8array (dirEntry.entryData, DIR_ENTRY_cluster, dirCluster);
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u16_to_u8array (dirEntry.entryData, DIR_ENTRY_clusterHigh, dirCluster >> 16);
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// Write the new directory's entry to it's parent
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if (!_FAT_directory_addEntry (partition, &dirEntry, parentCluster)) {
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_FAT_unlock(&partition->lock);
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r->_errno = ENOSPC;
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return -1;
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}
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// Create the dot entry within the directory
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memset (newEntryData, 0, DIR_ENTRY_DATA_SIZE);
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memset (newEntryData, ' ', 11);
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newEntryData[DIR_ENTRY_name] = '.';
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newEntryData[DIR_ENTRY_attributes] = ATTRIB_DIR;
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u16_to_u8array (newEntryData, DIR_ENTRY_cluster, dirCluster);
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u16_to_u8array (newEntryData, DIR_ENTRY_clusterHigh, dirCluster >> 16);
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// Write it to the directory, erasing that sector in the process
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_FAT_cache_eraseWritePartialSector ( partition->cache, newEntryData,
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_FAT_fat_clusterToSector (partition, dirCluster), 0, DIR_ENTRY_DATA_SIZE);
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// Create the double dot entry within the directory
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// if ParentDir == Rootdir then ".."" always link to Cluster 0
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if(parentCluster == partition->rootDirCluster)
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parentCluster = FAT16_ROOT_DIR_CLUSTER;
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newEntryData[DIR_ENTRY_name + 1] = '.';
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u16_to_u8array (newEntryData, DIR_ENTRY_cluster, parentCluster);
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u16_to_u8array (newEntryData, DIR_ENTRY_clusterHigh, parentCluster >> 16);
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// Write it to the directory
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_FAT_cache_writePartialSector ( partition->cache, newEntryData,
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_FAT_fat_clusterToSector (partition, dirCluster), DIR_ENTRY_DATA_SIZE, DIR_ENTRY_DATA_SIZE);
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// Flush any sectors in the disc cache
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if (!_FAT_cache_flush(partition->cache)) {
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_FAT_unlock(&partition->lock);
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r->_errno = EIO;
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return -1;
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}
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_FAT_unlock(&partition->lock);
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return 0;
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}
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int _FAT_statvfs_r (struct _reent *r, const char *path, struct statvfs *buf)
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{
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PARTITION* partition = NULL;
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unsigned int freeClusterCount;
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// Get the partition of the requested path
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partition = _FAT_partition_getPartitionFromPath (path);
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if (partition == NULL) {
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r->_errno = ENODEV;
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return -1;
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}
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_FAT_lock(&partition->lock);
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freeClusterCount = _FAT_fat_freeClusterCount (partition);
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// FAT clusters = POSIX blocks
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buf->f_bsize = partition->bytesPerCluster; // File system block size.
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buf->f_frsize = partition->bytesPerCluster; // Fundamental file system block size.
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buf->f_blocks = partition->fat.lastCluster - CLUSTER_FIRST + 1; // Total number of blocks on file system in units of f_frsize.
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buf->f_bfree = freeClusterCount; // Total number of free blocks.
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buf->f_bavail = freeClusterCount; // Number of free blocks available to non-privileged process.
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// Treat requests for info on inodes as clusters
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buf->f_files = partition->fat.lastCluster - CLUSTER_FIRST + 1; // Total number of file serial numbers.
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buf->f_ffree = freeClusterCount; // Total number of free file serial numbers.
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buf->f_favail = freeClusterCount; // Number of file serial numbers available to non-privileged process.
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// File system ID. 32bit ioType value
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buf->f_fsid = _FAT_disc_hostType(partition->disc);
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// Bit mask of f_flag values.
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buf->f_flag = ST_NOSUID /* No support for ST_ISUID and ST_ISGID file mode bits */
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| (partition->readOnly ? ST_RDONLY /* Read only file system */ : 0 ) ;
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// Maximum filename length.
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buf->f_namemax = MAX_FILENAME_LENGTH;
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_FAT_unlock(&partition->lock);
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return 0;
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}
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DIR_ITER* _FAT_diropen_r(struct _reent *r, DIR_ITER *dirState, const char *path) {
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DIR_ENTRY dirEntry;
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DIR_STATE_STRUCT* state = (DIR_STATE_STRUCT*) (dirState->dirStruct);
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bool fileExists;
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state->partition = _FAT_partition_getPartitionFromPath (path);
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if (state->partition == NULL) {
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r->_errno = ENODEV;
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return NULL;
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}
|
|
|
|
// Move the path pointer to the start of the actual path
|
|
if (strchr (path, ':') != NULL) {
|
|
path = strchr (path, ':') + 1;
|
|
}
|
|
if (strchr (path, ':') != NULL) {
|
|
r->_errno = EINVAL;
|
|
return NULL;
|
|
}
|
|
|
|
_FAT_lock(&state->partition->lock);
|
|
|
|
// Get the start cluster of the directory
|
|
fileExists = _FAT_directory_entryFromPath (state->partition, &dirEntry, path, NULL);
|
|
|
|
if (!fileExists) {
|
|
_FAT_unlock(&state->partition->lock);
|
|
r->_errno = ENOENT;
|
|
return NULL;
|
|
}
|
|
|
|
// Make sure it is a directory
|
|
if (! _FAT_directory_isDirectory (&dirEntry)) {
|
|
_FAT_unlock(&state->partition->lock);
|
|
r->_errno = ENOTDIR;
|
|
return NULL;
|
|
}
|
|
|
|
// Save the start cluster for use when resetting the directory data
|
|
state->startCluster = _FAT_directory_entryGetCluster (state->partition, dirEntry.entryData);
|
|
|
|
// Get the first entry for use with a call to dirnext
|
|
state->validEntry =
|
|
_FAT_directory_getFirstEntry (state->partition, &(state->currentEntry), state->startCluster);
|
|
|
|
// We are now using this entry
|
|
state->inUse = true;
|
|
_FAT_unlock(&state->partition->lock);
|
|
return (DIR_ITER*) state;
|
|
}
|
|
|
|
int _FAT_dirreset_r (struct _reent *r, DIR_ITER *dirState) {
|
|
DIR_STATE_STRUCT* state = (DIR_STATE_STRUCT*) (dirState->dirStruct);
|
|
|
|
_FAT_lock(&state->partition->lock);
|
|
|
|
// Make sure we are still using this entry
|
|
if (!state->inUse) {
|
|
_FAT_unlock(&state->partition->lock);
|
|
r->_errno = EBADF;
|
|
return -1;
|
|
}
|
|
|
|
// Get the first entry for use with a call to dirnext
|
|
state->validEntry =
|
|
_FAT_directory_getFirstEntry (state->partition, &(state->currentEntry), state->startCluster);
|
|
|
|
_FAT_unlock(&state->partition->lock);
|
|
return 0;
|
|
}
|
|
|
|
int _FAT_dirnext_r (struct _reent *r, DIR_ITER *dirState, char *filename, struct stat *filestat) {
|
|
DIR_STATE_STRUCT* state = (DIR_STATE_STRUCT*) (dirState->dirStruct);
|
|
|
|
_FAT_lock(&state->partition->lock);
|
|
|
|
// Make sure we are still using this entry
|
|
if (!state->inUse) {
|
|
_FAT_unlock(&state->partition->lock);
|
|
r->_errno = EBADF;
|
|
return -1;
|
|
}
|
|
|
|
// Make sure there is another file to report on
|
|
if (! state->validEntry) {
|
|
_FAT_unlock(&state->partition->lock);
|
|
r->_errno = ENOENT;
|
|
return -1;
|
|
}
|
|
|
|
// Get the filename
|
|
strncpy (filename, state->currentEntry.filename, MAX_FILENAME_LENGTH);
|
|
// Get the stats, if requested
|
|
if (filestat != NULL) {
|
|
_FAT_directory_entryStat (state->partition, &(state->currentEntry), filestat);
|
|
}
|
|
|
|
// Look for the next entry for use next time
|
|
state->validEntry =
|
|
_FAT_directory_getNextEntry (state->partition, &(state->currentEntry));
|
|
|
|
_FAT_unlock(&state->partition->lock);
|
|
return 0;
|
|
}
|
|
|
|
int _FAT_dirclose_r (struct _reent *r, DIR_ITER *dirState) {
|
|
DIR_STATE_STRUCT* state = (DIR_STATE_STRUCT*) (dirState->dirStruct);
|
|
|
|
// We are no longer using this entry
|
|
_FAT_lock(&state->partition->lock);
|
|
state->inUse = false;
|
|
_FAT_unlock(&state->partition->lock);
|
|
|
|
return 0;
|
|
}
|