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dir_entry.c
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#include <errno.h>
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "utils.h"
#include "fatfs.h"
#include "dir_entry.h"
unsigned char * extract_long_name(fat_lfn_entry_t *lfn)
{
int i;
unsigned char temp[2];
unsigned char buf[14];
unsigned char *final = NULL;
memset(temp, 0, sizeof(unsigned char)*2);
memset(buf, 0, sizeof(unsigned char)*14);
/* Get first five ascii */
for(i = 0; i < 5; i++)
{
memcpy(temp, &lfn->FNPart1[i*2], 1);
strcat(buf, temp);
}
/* Next six ascii */
for(i = 0; i < 6; i++)
{
memcpy(temp, &lfn->FNPart2[i*2], 1);
strcat(buf, temp);
}
/* Last two ascii */
for(i = 0; i < 2; i++)
{
memcpy(temp, &lfn->FNPart3[i*2], 1);
strcat(buf, temp);
}
buf[13] = '\0';
/* Remove filler chars at end of the long file name */
final = remove_all_chars(buf, 0xFF);
return final;
}
int fat_read_data(fatfs_t *fat, node_entry_t *file, unsigned char **buf, int count, int pointer)
{
int i;
int ptr = pointer;
int cnt = count;
int numOfSector = 0;
int clusterNodeNum = 0;
int curSectorPos = 0;
int sector_loc = 0;
int numToRead = 0;
const int bytes_per_sector = fat->boot_sector.bytes_per_sector;
unsigned char *sector = malloc(512*sizeof(unsigned char)); /* Each sector is 512 bytes long */
/* Clear */
memset(*buf, 0, sizeof(unsigned char)*count);
/* While we still have more to read, do it */
while(cnt)
{
/* Get the number of the sector in the cluster we want to read */
numOfSector = ptr / bytes_per_sector;
/* Figure out which cluster we are reading from */
clusterNodeNum = numOfSector / fat->boot_sector.sectors_per_cluster;
/* If new cluster is needed, get it */
if(file->NumCluster != clusterNodeNum)
{
if((file->NumCluster+1) == clusterNodeNum) /* If its just the next cluster, only have to read fat table once */
{
file->CurrCluster = read_fat_table_value(fat, file->CurrCluster*fat->byte_offset);
file->NumCluster++;
}
else /* Its not the next cluster, find it starting from the beginning */
{
/* Set to first cluster */
file->CurrCluster = file->StartCluster;
/* Advance to the cluster we want to read from. */
for(i = 0; i < clusterNodeNum; i++)
{
file->CurrCluster = read_fat_table_value(fat, file->CurrCluster*fat->byte_offset);
}
file->NumCluster = clusterNodeNum;
}
}
/* Calculate Sector Location from cluster and sector we want to read */
sector_loc = fat->data_sec_loc + ((file->CurrCluster - 2) * fat->boot_sector.sectors_per_cluster) + (numOfSector - (clusterNodeNum * fat->boot_sector.sectors_per_cluster));
/* Read 1 sector */
if(fat->dev->read_blocks(fat->dev, sector_loc, 1, sector) != 0)
{
#ifdef FATFS_DEBUG
printf("fat_read_data(dir_entry.c): Couldn't read the sector %d\n", sector_loc);
#endif
return -1;
}
/* Calculate current byte position in the sector we want to start reading from */
curSectorPos = ptr - (numOfSector * bytes_per_sector);
/* Calculate the number of chars to read */
numToRead = ((bytes_per_sector - curSectorPos) > cnt) ? cnt : (bytes_per_sector - curSectorPos);
/* Concat */
strncat(*buf, sector + curSectorPos, numToRead);
/* Advance variables */
ptr += numToRead; /* Advance file pointer */
cnt -= numToRead; /* Decrease bytes left to read */
}
free(sector);
return 0;
}
int fat_write_data(fatfs_t *fat, node_entry_t *file, unsigned char *bbuf, int count, int pointer)
{
int i;
int ptr = pointer;
int cnt = count;
int numOfSector = 0;
int clusterNodeNum = 0;
int curSectorPos = 0;
int sector_loc = 0;
int numToWrite = 0;
unsigned char *buf = bbuf;
const int bytes_per_sector = fat->boot_sector.bytes_per_sector;
unsigned char *sector = malloc(512*sizeof(unsigned char)); /* Each sector is 512 bytes long */
/* While we still have more to write, do it */
while(cnt)
{
/* Get the number of the sector in the cluster we want to write to */
numOfSector = ptr / bytes_per_sector;
/* Figure out which cluster we are writing to */
clusterNodeNum = numOfSector / fat->boot_sector.sectors_per_cluster;
/* This file has no clusters allocated to it, allocate one */
if(file->StartCluster == 0)
{
file->StartCluster = allocate_cluster(fat, 0);
file->EndCluster = file->StartCluster;
file->CurrCluster = file->StartCluster;
file->NumCluster = 0;
}
else
{
/* If new cluster is needed, get it */
if(file->NumCluster != clusterNodeNum)
{
if((file->NumCluster+1) == clusterNodeNum) /* If its just the next cluster, only have to read fat table once */
{
file->CurrCluster = read_fat_table_value(fat, file->CurrCluster*fat->byte_offset);
/* Check if the next cluster exists. If it doesn't then allocate another cluster for this file and break */
if((fat->fat_type == FAT16 && file->CurrCluster >= 0xFFF8)
|| (fat->fat_type == FAT32 && file->CurrCluster >= 0xFFFFFF8))
{
if((file->CurrCluster = allocate_cluster(fat, file->EndCluster)) == 0)
{
#ifdef FATFS_DEBUG
printf("fat_write_data(dir_entry.c): All out of clusters to Allocate\n");
#endif
return -1;
}
file->EndCluster = file->CurrCluster;
}
file->NumCluster++;
}
else
{
/* Set to first cluster */
file->CurrCluster = file->StartCluster;
/* Advance to the cluster we want to write to */
for(i = 0; i < clusterNodeNum; i++)
{
/* Grab the next cluster */
file->CurrCluster = read_fat_table_value(fat, file->CurrCluster*fat->byte_offset);
/* Check if the next cluster exists. If it doesn't then allocate another cluster for this file and break */
if((fat->fat_type == FAT16 && file->CurrCluster >= 0xFFF8)
|| (fat->fat_type == FAT32 && file->CurrCluster >= 0xFFFFFF8))
{
if((file->CurrCluster = allocate_cluster(fat, file->EndCluster)) == 0)
{
#ifdef FATFS_DEBUG
printf("fat_write_data(dir_entry.c): All out of clusters to Allocate\n");
#endif
return -1;
}
file->EndCluster = file->CurrCluster;
break;
}
}
file->NumCluster = clusterNodeNum;
}
}
}
/* Calculate Sector Location from cluster and sector we want to read and then write to */
sector_loc = fat->data_sec_loc + ((file->CurrCluster - 2) * fat->boot_sector.sectors_per_cluster) + (numOfSector - (clusterNodeNum * fat->boot_sector.sectors_per_cluster));
/* Read 1 sector */
if(fat->dev->read_blocks(fat->dev, sector_loc, 1, sector) != 0)
{
#ifdef FATFS_DEBUG
printf("fat_write_data(dir_entry.c): Couldn't read the sector %d\n", sector_loc);
#endif
return -1;
}
/* Calculate current byte position in the sector we want to start writing to */
curSectorPos = ptr - (numOfSector * bytes_per_sector);
/* Calculate the number of chars to write */
numToWrite = ((bytes_per_sector - curSectorPos) > cnt) ? cnt : (bytes_per_sector - curSectorPos);
/* Memcpy */
memcpy(sector + curSectorPos, buf, numToWrite);
/* Write one sector */
if(fat->dev->write_blocks(fat->dev, sector_loc, 1, sector) != 0)
{
#ifdef FATFS_DEBUG
printf("fat_write_data(dir_entry.c): Couldnt write the sector %d\n", sector_loc);
#endif
return -1;
}
/* Advance variables */
ptr += numToWrite; /* Advance file pointer */
buf += numToWrite; /* Advance buf pointer */
cnt -= numToWrite; /* Decrease bytes left to write */
}
free(sector);
return 0;
}
void update_sd_entry(fatfs_t *fat, node_entry_t *file)
{
short clusthi = 0;
short clustlo = 0;
unsigned char *sector = malloc(512*sizeof(unsigned char)); /* Each sector is 512 bytes long */
time_t rawtime;
short tme = 0;
short date = 0;
struct tm * timeinfo;
time (&rawtime);
timeinfo = localtime(&rawtime);
tme = generate_time(timeinfo->tm_hour, timeinfo->tm_min, timeinfo->tm_sec/2);
date = generate_date(1900 + timeinfo->tm_year, timeinfo->tm_mon+1, timeinfo->tm_mday);
/* Read sector */
if(fat->dev->read_blocks(fat->dev, file->Location[0], 1, sector) != 0)
{
#ifdef FATFS_DEBUG
printf("update_sd_entry(dir_entry.c): Couldn't read the sector %d\n", file->Location[0]);
#endif
return;
}
/* Edit Entry */
memcpy(sector + file->Location[1] + FILESIZE, &(file->FileSize), 4);
clusthi = (file->StartCluster >> 16);
clustlo = (file->StartCluster & 0xFFFF);
memcpy(sector + file->Location[1] + STARTCLUSTERHI, &(clusthi), 2);
memcpy(sector + file->Location[1] + STARTCLUSTERLOW, &(clustlo), 2);
memcpy(sector + file->Location[1] + LASTACCESSDATE, &(date), 2);
memcpy(sector + file->Location[1] + LASTWRITETIME, &(tme), 2);
memcpy(sector + file->Location[1] + LASTWRITEDATE, &(date), 2);
/* Write it back */
if(fat->dev->write_blocks(fat->dev, file->Location[0], 1, sector) != 0)
{
#ifdef FATFS_DEBUG
printf("update_sd_entry(dir_entry.c): Couldn't write the sector %d\n", file->Location[0]);
#endif
return;
}
free(sector);
}
void delete_struct_entry(node_entry_t * node)
{
if(node == NULL)
return;
free(node->Name); /* Free the name */
free(node->ShortName); /* Free the shortname */
free(node);
node = NULL;
}
unsigned int allocate_cluster(fatfs_t *fat, unsigned int end_clust)
{
unsigned int fat_index = fat->next_free_fat_index;
unsigned int cap = fat_index;
unsigned int marker = (fat->fat_type == FAT16) ? 0xFFFF : 0x0FFFFFFF;
unsigned int cluster_num = 0;
/* Search for a free cluster starting at index 2 or the last index where we found a free cluster(makes future calls faster) */
while(fat_index < fat->boot_sector.bytes_per_sector*fat->table_size) { /* Go through Table one index at a time */
cluster_num = read_fat_table_value(fat, fat_index*fat->byte_offset);
/* If we found a free entry */
if(cluster_num == 0x00)
{
#ifdef FATFS_DEBUG
printf("allocate_cluster(dir_entry.c): Found a free cluster entry -- Index: %d\n", fat_index);
#endif
if(end_clust != 0) /* Cant change what doesnt exist */
{
write_fat_table_value(fat, end_clust*fat->byte_offset, fat_index); /* Change the table to indicate an allocated cluster */
}
write_fat_table_value(fat, fat_index*fat->byte_offset, marker); /* Put the marker(0xFFFF or 0x0FFFFFFF) at the allocated cluster index */
fat->next_free_fat_index = fat_index; /* Save this index for next time */
return fat_index;
}
fat_index++;
}
/* In case we did not find one above and started from a fat_index that was not 2 */
for(fat_index = 2;fat_index < cap; fat_index++)
{
cluster_num = read_fat_table_value(fat, fat_index*fat->byte_offset);
/* If we found a free entry */
if(cluster_num == 0x00)
{
#ifdef FATFS_DEBUG
printf("allocate_cluster(dir_entry.c): Found a free cluster entry -- Index: %d\n", fat_index);
#endif
if(end_clust != 0) /* Cant change what doesnt exist */
{
write_fat_table_value(fat, end_clust*fat->byte_offset, fat_index); /* Change the table to indicate an allocated cluster */
}
write_fat_table_value(fat, fat_index*fat->byte_offset, marker); /* Put the marker(0xFFFF or 0x0FFFFFFF) at the allocated cluster index */
fat->next_free_fat_index = fat_index; /* Save this index for next time */
return fat_index;
}
}
#ifdef FATFS_DEBUG
printf("allocate_cluster(dir_entry.c): Didnt find a free Cluster\n");
#endif
/* Didn't find a free cluster */
return 0;
}
void delete_cluster_list(fatfs_t *fat, node_entry_t *f)
{
const short int clear = 0;
unsigned int clust = f->StartCluster;
unsigned int value;
if(clust == 0)
return;
while((fat->fat_type == FAT16 && clust < 0xFFF8)
|| (fat->fat_type == FAT32 && clust < 0xFFFFFF8))
{
value = read_fat_table_value(fat, clust*fat->byte_offset);
write_fat_table_value(fat, clust*fat->byte_offset, clear);
#ifdef FATFS_DEBUG
printf("delete_cluster_list(dir_entry.c) Freed Cluster: %d\n", clust);
#endif
clust = value;
}
f->StartCluster = 0;
f->EndCluster = 0;
}
int generate_and_write_entry(fatfs_t *fat, char *entry_name, node_entry_t *newfile, node_entry_t *parent)
{
int i;
int *loc = NULL;
int last;
unsigned char order = 1;
unsigned int offset = 0;
char *shortname = NULL;
unsigned char checksum;
int longfilename = 0;
unsigned char res = 0x00;
fat_dir_entry_t entry;
fat_lfn_entry_t *lfn_entry_list[20]; /* Can have a maximum of 20 long file name entries */
for(i = 0; i < 20; i++)
lfn_entry_list[i] = NULL;
shortname = generate_short_filename(fat, parent, entry_name, &longfilename, &res);
checksum = generate_checksum(shortname);
newfile->ShortName = malloc(strlen(shortname) + 1);
strncpy(newfile->ShortName, shortname, strlen(shortname));
newfile->ShortName[strlen(shortname)] = '\0';
/* Make lfn entries */
if(longfilename)
{
i = 0;
while(offset < strlen(entry_name))
{
/* Build long name entries */
lfn_entry_list[i++] = generate_long_filename_entry(entry_name+offset, checksum, order++);
offset += 13;
}
last = i - 1; /* Refers to last entry in array */
lfn_entry_list[last]->Order |= 0x40; /* Set(OR) last one to special value order to signify it is the last lfn entry */
/* Get loc for order amount of entries plus 1(shortname entry). Returns an int array Sector(loc[0]), ptr(loc[1]) */
loc = get_free_locations(fat, parent, (int)order);
/* Write it(reverse order) */
for(i = last; i >= 0; i--)
{
write_entry(fat, lfn_entry_list[i], LONGFILENAME, loc);
/* Do calculations for sector if need be */
loc[1] += 32;
if((loc[1]/fat->boot_sector.bytes_per_sector) >= 1)
{
loc[0]++; /* New sector */
loc[1] = 0; /* Reset ptr in new sector */
}
}
}
/* Allocate a cluster. Folders Only. */
if(newfile->Attr & DIRECTORY)
{
newfile->StartCluster = allocate_cluster(fat, 0);
newfile->EndCluster = newfile->StartCluster;
clear_cluster(fat, newfile->StartCluster);
if(fat->fat_type == FAT32)
set_fsinfo_nextfree(fat); /* Write it to FSInfo sector which only exists for Fat32 */
}
/* Make regular entry and write it to SD FAT */
strncpy(entry.FileName, shortname, 8);
entry.FileName[8] = '\0';
strncpy(entry.Ext, shortname+9, 3 ); /* Skip filename and '.' */
entry.Ext[3] = '\0';
entry.Attr = newfile->Attr;
entry.Res = res;
entry.FileSize = 0; /* For both new files and new folders */
if(newfile->Attr & DIRECTORY) /* Folder */
{
entry.FstClusHI = newfile->StartCluster >> 16;
entry.FstClusLO = newfile->StartCluster & 0xFFFF;
}
else /* File */
{
entry.FstClusHI = 0;
entry.FstClusLO = 0;
}
/* Write it (after long file name entries) */
if(longfilename)
{
write_entry(fat, &entry, newfile->Attr, loc);
} else
{
loc = get_free_locations(fat, parent, 1);
write_entry(fat, &entry, newfile->Attr, loc);
}
/* Save the locations */
newfile->Location[0] = loc[0];
newfile->Location[1] = loc[1];
free(shortname);
free(loc);
return 0;
}
void delete_sd_entry(fatfs_t *fat, node_entry_t *file)
{
unsigned int sector_loc = file->Location[0];
int ptr = file->Location[1];
unsigned char sector[512];
/* Delete Long file name entries (if any) */
ptr -= 32;
if(ptr < 0)
{
sector_loc -= 1;
ptr = fat->boot_sector.bytes_per_sector - 32;
}
/* Read fat sector */
fat->dev->read_blocks(fat->dev, sector_loc, 1, sector);
/* Edit Entry */
while((sector+ptr)[ATTRIBUTE] == LONGFILENAME && (sector+ptr)[0] != 0xE5)
{
(sector+ptr)[0] = 0xE5;
ptr -= 32;
if(ptr < 0)
{
fat->dev->write_blocks(fat->dev, sector_loc, 1, sector);
sector_loc -= 1;
ptr = fat->boot_sector.bytes_per_sector - 32;
fat->dev->read_blocks(fat->dev, sector_loc, 1, sector);
}
}
if(sector_loc != file->Location[0]) /* Dont write and read the same block if we dont have to */
{
/* Write it back */
fat->dev->write_blocks(fat->dev, sector_loc, 1, sector);
/* Read a diff sector */
fat->dev->read_blocks(fat->dev, file->Location[0], 1, sector);
}
/* Delete file/folder entry */
(sector + file->Location[1])[0] = 0xE5;
fat->dev->write_blocks(fat->dev, file->Location[0], 1, sector);
}
node_entry_t *fat_search_by_path(fatfs_t *fat, const char *fn)
{
unsigned char *ufn = malloc(strlen(fn)+1);
unsigned char *pch = NULL;
node_entry_t *temp = NULL;
node_entry_t *rv = NULL;
unsigned int cluster = fat->root_cluster_num;
/* Make sure the files/folders are captialized */
strcpy(ufn, fn);
ufn[strlen(fn)] = '\0';
/* Build Root */
temp = malloc(sizeof(node_entry_t));
temp->Name = (unsigned char *)remove_all_chars(fat->mount, '/'); /* */
temp->ShortName = (unsigned char *)remove_all_chars(fat->mount, '/');
temp->Attr = DIRECTORY; /* Root directory is obviously a directory */
temp->StartCluster = cluster; /* Root directory has no data clusters associated with it(FAT16). Non-NULL with FAT32 */
temp->EndCluster = end_cluster(fat, temp->StartCluster);
rv = temp;
pch = strtok(ufn,"/"); /* Grab Root */
if(strcasecmp(pch, temp->Name) == 0) {
pch = strtok (NULL, "/");
while(pch != NULL) {
if((rv = search_directory(fat, temp, pch)) != NULL)
{
pch = strtok (NULL, "/");
delete_struct_entry(temp);
temp = rv;
}
else
{
#ifdef FATFS_DEBUG
printf("Couldnt find \"%s\" in \"%s\"\n", pch, temp->Name);
#endif
delete_struct_entry(temp);
free(ufn);
return NULL;
}
}
}
free(ufn);
return rv;
}
node_entry_t *create_entry(fatfs_t *fat, const char *fn, unsigned char attr)
{
int loc[2];
char *pch;
char *filename;
char *ufn = malloc(strlen(fn)+1);
node_entry_t *newfile;
node_entry_t *temp = NULL;
node_entry_t *rv = NULL;
unsigned int cluster = fat->root_cluster_num;
fat_dir_entry_t entry;
/* Make a copy of fn */
memcpy(ufn, fn, strlen(fn));
ufn[strlen(fn)] = '\0';
/* Build Root */
temp = malloc(sizeof(node_entry_t));
temp->Name = (unsigned char *)remove_all_chars(fat->mount, '/'); /* */
temp->ShortName = (unsigned char *)remove_all_chars(fat->mount, '/');
temp->Attr = DIRECTORY; /* Root directory is obviously a directory */
temp->StartCluster = cluster; /* Root directory has no data clusters associated with it(FAT16). Non-NULL with FAT32 */
temp->EndCluster = end_cluster(fat, temp->StartCluster);
rv = temp;
pch = strtok(ufn,"/"); /* Grab Root */
if(strcasecmp(pch, temp->Name) == 0) {
pch = strtok (NULL, "/");
while(pch != NULL) {
if((rv = search_directory(fat, temp, pch)) != NULL)
{
if(rv->Attr & READ_ONLY) /* Check and make sure directory is not read only. */
{
free(ufn);
errno = EROFS;
delete_struct_entry(temp);
delete_struct_entry(rv);
return NULL;
}
pch = strtok (NULL, "/");
delete_struct_entry(temp);
temp = rv;
}
else
{
filename = pch; /* We possibly have the filename */
/* Return NULL if we encounter a directory that doesn't exist */
if((pch = strtok (NULL, "/"))) { /* See if there is more to parse through */
free(ufn);
errno = ENOTDIR;
delete_struct_entry(temp);
return NULL; /* if there is that means we are looking in a directory */
} /* that doesn't exist. */
/* Make sure the filename is valid */
if(correct_filename(filename) == -1) {
free(ufn);
delete_struct_entry(temp);
return NULL;
}
/* Create file/folder */
newfile = (node_entry_t *) malloc(sizeof(node_entry_t));
newfile->Name = malloc(strlen(filename)+1);
memcpy(newfile->Name, filename, strlen(filename));
newfile->Name[strlen(filename)] = '\0';
newfile->Attr = attr;
newfile->FileSize = 0;
newfile->StartCluster = 0;
newfile->EndCluster = 0;
if(generate_and_write_entry(fat, newfile->Name, newfile, temp) == -1)
{
#ifdef FATFS_DEBUG
printf("create_entry(dir_entry.c) : Didnt Create file/folder named %s\n", newfile->Name);
#endif
free(ufn);
errno = EDQUOT;
delete_struct_entry(temp);
delete_struct_entry(newfile); /* This doesn't take care of removing clusters from SD card */
return NULL;
}
/* If its a folder, add the hidden files "." and ".." */
if(attr & DIRECTORY)
{
/* Add '.' folder entry */
strncpy(entry.FileName, ". ", 8);
entry.FileName[8] = '\0';
strncpy(entry.Ext, " ", 3 );
entry.Ext[3] = '\0';
entry.Attr = DIRECTORY;
entry.FileSize = 0;
entry.FstClusHI = newfile->StartCluster >> 16;
entry.FstClusLO = newfile->StartCluster & 0xFFFF;
loc[0] = fat->data_sec_loc + (newfile->StartCluster - 2) * fat->boot_sector.sectors_per_cluster;
loc[1] = 0;
write_entry(fat, &entry, DIRECTORY, loc);
/* Add '..' folder entry */
strncpy(entry.FileName, ".. ", 8);
entry.FileName[8] = '\0';
strncpy(entry.Ext, " ", 3 );
entry.Ext[3] = '\0';
entry.Attr = DIRECTORY;
entry.FileSize = 0;
if(strcasecmp(temp->Name, fat->mount) == 0) /* If parent of this folder is the root directory, set first cluster number to 0 */
{
entry.FstClusHI = 0;
entry.FstClusLO = 0;
}
else
{
entry.FstClusHI = temp->StartCluster >> 16;
entry.FstClusLO = temp->StartCluster & 0xFFFF;
}
loc[1] = 32; /* loc[0] Doesnt change */
write_entry(fat, &entry, DIRECTORY, loc);
}
free(ufn);
delete_struct_entry(temp);
return newfile;
}
}
}
free(ufn);
delete_struct_entry(temp);
/* Path was invalid from the beginning */
errno = ENOTDIR;
return NULL;
}
node_entry_t *search_directory(fatfs_t *fat, node_entry_t *node, const char *fn)
{
int i;
unsigned int sector_loc = 0;
unsigned int clust = node->StartCluster;
node_entry_t *rv = NULL;
/* If the directory is the root directory and if fat->fat_type = FAT16 consider it a special case */
if(fat->fat_type == FAT16 && strcasecmp(node->Name, fat->mount) == 0) /* Go through special(static number) sectors. No clusters. */
{
for(i = 0; i < fat->root_dir_sectors_num; i++) {
sector_loc = fat->root_dir_sec_loc + i;
/* Search in a sector for fn */
rv = browse_sector(fat, sector_loc, 0, fn);
if(rv != NULL) /* If we found it return it, otherwise go to the next sector */
{
return rv;
}
}
}
else /* Go through clusters/sectors */
{
while((fat->fat_type == FAT16 && clust < 0xFFF8)
|| (fat->fat_type == FAT32 && clust < 0xFFFFFF8))
{
/* Go through all the sectors in this cluster */
for(i = 0; i < fat->boot_sector.sectors_per_cluster; i++)
{
sector_loc = fat->data_sec_loc + ((clust - 2) * fat->boot_sector.sectors_per_cluster) + i;
/* Search in a sector for fn */
rv = browse_sector(fat, sector_loc, 0, fn);
if(rv != NULL) /* If we found it return it, otherwise go to the next sector */
{
return rv;
}
}
/* Advance to next cluster */
clust = read_fat_table_value(fat, clust*fat->byte_offset);
}
}
return NULL;
}
/* If fn is NULL, then just grab the first entry encountered */
node_entry_t *browse_sector(fatfs_t *fat, unsigned int sector_loc, unsigned int ptr, const char *fn)
{
int j, k;
int var = ptr;
static int contin = 0;
unsigned char *str_temp;
static int last_sec = 0;
static unsigned char buf[512];
fat_lfn_entry_t lfn;
fat_dir_entry_t temp;
static unsigned char lfnbuf1[256]; /* Longest a filename can be is 255 chars */
static unsigned char lfnbuf2[256]; /* Longest a filename can be is 255 chars */
node_entry_t *new_entry;
/* Only wipe if there wasnt a long file name entry in the last sector that wasnt attached to a shortname entry */
if(contin == 0)
{
memset(lfnbuf1, 0, sizeof(unsigned char)*256);
memset(lfnbuf2, 0, sizeof(unsigned char)*256);
}
if(sector_loc != last_sec) /* Only read a new sector when we have to */
{
/* Read 1 sector */
fat->dev->read_blocks(fat->dev, sector_loc, 1, buf);
last_sec = sector_loc;
}
for(j = var/32; j < 16; j++) /* How many entries per sector(32 byte entry x 16 = 512 bytes = 1 sector) */
{
/* Entry does not exist if it has been deleted(0xE5) or is an empty entry(0) */
if((buf+var)[0] == DELETED || (buf+var)[0] == EMPTY)
{
var += ENTRYSIZE; /* Increment to next entry */
continue;
}
/* Check if it is a long filename entry */
if((buf+var)[ATTRIBUTE] == LONGFILENAME) {
memset(&lfn, 0, sizeof(fat_lfn_entry_t));
memcpy(&lfn, buf+var, sizeof(fat_lfn_entry_t));
if(lfnbuf1[0] == '\0')
{
str_temp = extract_long_name(&lfn);
strcpy(lfnbuf1, str_temp);
free(str_temp);
if(lfnbuf2[0] != '\0') {
strcat(lfnbuf1, lfnbuf2);
memset(lfnbuf2, 0, sizeof(unsigned char)*256);
}
}
else if(lfnbuf2[0] == '\0')
{
str_temp = extract_long_name(&lfn);
strcpy(lfnbuf2, str_temp);
free(str_temp);
if(lfnbuf1[0] != '\0') {
strcat(lfnbuf2, lfnbuf1);
memset(lfnbuf1, 0, sizeof(unsigned char)*256);
}
}
contin = 1;
var += ENTRYSIZE;
continue; /* Continue on to the next entry */
}
/* Its a file/folder entry */
else {
memset(&temp, 0, sizeof(fat_dir_entry_t));
memcpy(temp.FileName, (buf+var+FILENAME), 8);
memcpy(temp.Ext, (buf+var+EXTENSION), 3);
memcpy(&(temp.Attr), (buf+var+ATTRIBUTE), 1);
memcpy(&(temp.Res), (buf+var+RESERVED), 1);
memcpy(&(temp.FstClusHI), (buf+var+STARTCLUSTERHI), 2);
memcpy(&(temp.FstClusLO), (buf+var+STARTCLUSTERLOW), 2);
memcpy(&(temp.FileSize), (buf+var+FILESIZE), 4);
temp.FileName[8] = '\0';
temp.Ext[3] = '\0';
contin = 0;
/* Dont care about these hidden entries */
if(strcmp(temp.FileName, ". ") == 0 || strcmp(temp.FileName, ".. ") == 0)
{
var += ENTRYSIZE;
continue; /* Continue on to the next entry */
}
/* Deal with no long name */
if(lfnbuf1[0] == '\0' && lfnbuf2[0] == '\0')
{
strcat(lfnbuf1, temp.FileName);
strcat(lfnbuf2, temp.FileName);
if(temp.Res & 0x08) /* If the filename is supposed to appear lowercase...make it so */
{
k = 0;
while(lfnbuf2[k])
{
lfnbuf2[k] = tolower((int)lfnbuf2[k]);
k++;
}
}
if(temp.Ext[0] != ' ') { /* If we actually have an extension....add it in */
if(temp.Attr == VOLUME_ID) { /* Extension is part of the VOLUME name(node->FileName) */
strcat(lfnbuf1, temp.Ext);
}
else {
strcat(lfnbuf1, ".");
strcat(lfnbuf1, temp.Ext);
strcat(lfnbuf2, ".");
strcat(lfnbuf2, temp.Ext);
if(temp.Res & 0x10) /* If the extension is supposed to appear lowercase...make it so */
{
k = strlen(temp.FileName) + 1; /* + 1 for period */
while(lfnbuf2[k])
{
lfnbuf2[k] = tolower((int)lfnbuf2[k]);
k++;
}
}
}
}
str_temp = remove_all_chars(lfnbuf1,' ');
strcpy(lfnbuf1, str_temp);
free(str_temp);
str_temp = remove_all_chars(lfnbuf2,' ');
strcpy(lfnbuf2, str_temp);
free(str_temp);
if(fn == NULL || strcasecmp(lfnbuf1, fn) == 0) /* We found the file we are looking for */
{
new_entry = malloc(sizeof(node_entry_t));
new_entry->Name = malloc(strlen(lfnbuf2));
new_entry->ShortName = malloc(strlen(lfnbuf1));
strcpy(new_entry->Name, lfnbuf2);
strcpy(new_entry->ShortName, lfnbuf1);
memset(lfnbuf1, 0, sizeof(unsigned char)*256);
memset(lfnbuf2, 0, sizeof(unsigned char)*256);
}
else
{
var += ENTRYSIZE;
memset(lfnbuf1, 0, sizeof(unsigned char)*256);
memset(lfnbuf2, 0, sizeof(unsigned char)*256);
continue; /* Continue on to the next entry */
}
}
else if(lfnbuf1[0] != '\0')
{
strcat(lfnbuf2, temp.FileName);
if(temp.Ext[0] != ' ') { /* If we actually have an extension....add it in */
if(temp.Attr == VOLUME_ID) { /* Extension is part of the VOLUME name(node->FileName) */
strcat(lfnbuf2, temp.Ext);
}