usbloadergx/source/libs/libfat/libfat.c

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/*
libfat.c
Simple functionality for startup, mounting and unmounting of FAT-based devices.
Copyright (c) 2006 Michael "Chishm" Chisholm
Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation and/or
other materials provided with the distribution.
3. The name of the author may not be used to endorse or promote products derived
from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/iosupport.h>
#include <unistd.h>
#include <string.h>
#include <stdio.h>
#include "common.h"
#include "partition.h"
#include "fatfile.h"
#include "fatdir.h"
#include "lock.h"
#include "mem_allocate.h"
#include "disc.h"
static const devoptab_t dotab_fat = {
"fat",
sizeof (FILE_STRUCT),
_FAT_open_r,
_FAT_close_r,
_FAT_write_r,
_FAT_read_r,
_FAT_seek_r,
_FAT_fstat_r,
_FAT_stat_r,
_FAT_link_r,
_FAT_unlink_r,
_FAT_chdir_r,
_FAT_rename_r,
_FAT_mkdir_r,
sizeof (DIR_STATE_STRUCT),
_FAT_diropen_r,
_FAT_dirreset_r,
_FAT_dirnext_r,
_FAT_dirclose_r,
_FAT_statvfs_r,
_FAT_ftruncate_r,
_FAT_fsync_r,
NULL, /* Device data */
NULL,
NULL
};
bool fatMount (const char* name, const DISC_INTERFACE* interface, sec_t startSector, uint32_t cacheSize, uint32_t SectorsPerPage) {
PARTITION* partition;
devoptab_t* devops;
char* nameCopy;
if(!name || strlen(name) > 8 || !interface)
return false;
if(!interface->startup())
return false;
if(!interface->isInserted())
return false;
char devname[10];
sprintf(devname, "%s:", name);
if(FindDevice(devname) >= 0)
return true;
devops = _FAT_mem_allocate (sizeof(devoptab_t) + strlen(name) + 1);
if (!devops) {
return false;
}
// Use the space allocated at the end of the devoptab struct for storing the name
nameCopy = (char*)(devops+1);
// Initialize the file system
partition = _FAT_partition_constructor (interface, cacheSize, SectorsPerPage, startSector);
if (!partition) {
_FAT_mem_free (devops);
return false;
}
// Add an entry for this device to the devoptab table
memcpy (devops, &dotab_fat, sizeof(dotab_fat));
strcpy (nameCopy, name);
devops->name = nameCopy;
devops->deviceData = partition;
AddDevice (devops);
return true;
}
bool fatMountSimple (const char* name, const DISC_INTERFACE* interface) {
return fatMount (name, interface, 0, DEFAULT_CACHE_PAGES, DEFAULT_SECTORS_PAGE);
}
void fatUnmount (const char* name) {
devoptab_t *devops;
PARTITION* partition;
if(!name)
return;
devops = (devoptab_t*)GetDeviceOpTab (name);
if (!devops) {
return;
}
// Perform a quick check to make sure we're dealing with a libfat controlled device
if (devops->open_r != dotab_fat.open_r) {
return;
}
if (RemoveDevice (name) == -1) {
return;
}
partition = (PARTITION*)devops->deviceData;
_FAT_partition_destructor (partition);
_FAT_mem_free (devops);
}
bool fatInit (uint32_t cacheSize, bool setAsDefaultDevice) {
int i;
int defaultDevice = -1;
const DISC_INTERFACE *disc;
for (i = 0;
_FAT_disc_interfaces[i].name != NULL && _FAT_disc_interfaces[i].getInterface != NULL;
i++)
{
disc = _FAT_disc_interfaces[i].getInterface();
if (fatMount (_FAT_disc_interfaces[i].name, disc, 0, cacheSize, DEFAULT_SECTORS_PAGE)) {
// The first device to successfully mount is set as the default
if (defaultDevice < 0) {
defaultDevice = i;
}
}
}
if (defaultDevice < 0) {
// None of our devices mounted
return false;
}
if (setAsDefaultDevice) {
char filePath[MAXPATHLEN * 2];
strcpy (filePath, _FAT_disc_interfaces[defaultDevice].name);
strcat (filePath, ":/");
#ifdef ARGV_MAGIC
if ( __system_argv->argvMagic == ARGV_MAGIC && __system_argv->argc >= 1 && strrchr( __system_argv->argv[0], '/' )!=NULL ) {
// Check the app's path against each of our mounted devices, to see
// if we can support it. If so, change to that path.
for (i = 0;
_FAT_disc_interfaces[i].name != NULL && _FAT_disc_interfaces[i].getInterface != NULL;
i++)
{
if ( !strncasecmp( __system_argv->argv[0], _FAT_disc_interfaces[i].name,
strlen(_FAT_disc_interfaces[i].name)))
{
char *lastSlash;
strcpy(filePath, __system_argv->argv[0]);
lastSlash = strrchr( filePath, '/' );
if ( NULL != lastSlash) {
if ( *(lastSlash - 1) == ':') lastSlash++;
*lastSlash = 0;
}
}
}
}
#endif
chdir (filePath);
}
return true;
}
bool fatInitDefault (void) {
return fatInit (DEFAULT_CACHE_PAGES, true);
}
void fatGetVolumeLabel (const char* name, char *label) {
devoptab_t *devops;
PARTITION* partition;
char *buf;
int namelen,i;
if(!name || !label)
return;
namelen = strlen(name);
buf=(char*)_FAT_mem_allocate(sizeof(char)*namelen+2);
strcpy(buf,name);
if (name[namelen-1] == '/') {
buf[namelen-1]='\0';
namelen--;
}
if (name[namelen-1] != ':') {
buf[namelen]=':';
buf[namelen+1]='\0';
}
devops = (devoptab_t*)GetDeviceOpTab(buf);
for(i=0;buf[i]!='\0' && buf[i]!=':';i++);
if (!devops || strncasecmp(buf,devops->name,i)) {
_FAT_mem_free(buf);
return;
}
_FAT_mem_free(buf);
// Perform a quick check to make sure we're dealing with a libfat controlled device
if (devops->open_r != dotab_fat.open_r) {
return;
}
partition = (PARTITION*)devops->deviceData;
if(!_FAT_directory_getVolumeLabel(partition, label)) {
strncpy(label,partition->label,11);
label[11]='\0';
}
if(!strncmp(label, "NO NAME", 7)) label[0]='\0';
}