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lsfs_16-bit
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lsfs_16-bit/implementation/lsfs.h

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#ifndef LSFS_H
#define LSFS_H
#include "../main.h"
typedef struct lsfs_file lsfs_file;
typedef struct Directory_Table Directory_Table;
typedef struct Table_Entry Table_Entry;
int lsfs_disk_getattr(find_file, path, fsci);
int lsfs_disk_read_data_from_file(file, buffer_size, data, offset_to_next_entry);
Directory_Table* lsfs_find_directory(path, drop_filename, fsci);
typedef enum Table_Entry_Kind
{
/* These are specific values since, is has to corrospond to the implementation in assembly*/
ENTRY_EMPTY = 0,
ENTRY_FILE = 1,
ENTRY_DIRECTORY = 2,
} Table_Entry_Kind;
struct Table_Entry
{
char filename[256];
unsigned long file_id[2];
unsigned long file_size[2];
void* ext_file_data_low;
void* ext_file_data_high;
long number_sector_s; /* <- Just try to remove the last undercore and compile . */
short entry_kind;
short extra_control_bits1;
short extra_control_bits2;
short extra_control_bits3;
long table_entry_sector_index[2];
long data_pointer[NUM_DATA_POINTERS * 2]; /* if it is a directory, the first pointer will be to the next table. */
};
struct lsfs_file {
unsigned long file_id[2];
long table_entry_pointer[2];
Table_Entry_Kind entry_kind;
char* filename;
long owner_id;
unsigned long size[2];
long creation_date[2];
long access_time[2];
long modification_time[2];
long number_sector;
long table_entry_sector_index[2];
long data_pointer[NUM_DATA_POINTERS * 2];
};
struct Directory_Table
{
Table_Entry entries[DEFAULT_TABLE_SIZE];
};
/*typedef struct File_System_Control_Information
{
char filesystem_information[256];
long master_table_index[2];
long this_partition_offset_on_disk[2];
long next_free_sector[2];
long next_uniqe_id[2]; /* both files and directories gets this.
long next_sector_reuse_pointer[2];
long last_sector_index_on_partition[2];
long maximum_sectors_on_disk[2];
long sector_size_on_disk[2];
long not_used[48];
} FSCI;
*/
int lsfs_disk_getattr(find_file, path, fsci)
lsfs_file* find_file;
char *path;
FSCI *fsci;
{
int i;
String_Array *split_path = string_split_c(path, '/', false);
Length_String *filename = split_path->strings[split_path->length-1];
/* Start from the master table*/
Directory_Table *dir_table = lsfs_find_directory(path, true, fsci);
for (i = 0; i < DEFAULT_TABLE_SIZE; i++)
{
int j;
/*
print(dir_table->entries[i].filename);
print(filename->chars);
print_newline();
print_newline();
print("Size of table_entry: ");
dump_ax(sizeof(Table_Entry));
print_newline();
print_newline();
*/
if(strcmp( filename->chars, dir_table->entries[i].filename ) == 0) {
find_file->file_id[0] = dir_table->entries[i].file_id[0];
find_file->entry_kind = dir_table->entries[i].entry_kind;
find_file->table_entry_pointer[0] = i;
find_file->filename = dir_table->entries[i].filename;
find_file->table_entry_sector_index[0] = dir_table->entries[i].table_entry_sector_index;
find_file->owner_id = 1;
find_file->size[0] = dir_table->entries[i].file_size[0]; /* dir_table->entries[i].data_pointer[0]; ;*/
find_file->creation_date[0] = 0;
find_file->access_time[0] = 0;
find_file->modification_time[0] = 0;
/* memcpy(find_file->data_pointer, dir_table->entries[i].data_pointer, NUM_DATA_POINTERS * 8); */
for (j = 0; j < NUM_DATA_POINTERS; j = j + 2)
{
find_file->data_pointer[j] = dir_table->entries[i].data_pointer[j];
}
find_file->number_sector = 1; /* TODO: should be loaded from disk.*/
return 1;
}
}
return 0;
}
Directory_Table* lsfs_find_directory(path, drop_filename, fsci)
char *path;
short drop_filename;
FSCI *fsci;
{
int number_of_traversal;
int i, j;
String_Array *split_path;
Directory_Table *dir_table = calloc(1, sizeof(Directory_Table));
/* printf("Table index: %lu \n",fsci->master_table_index ); */
disk_service_read_data_from_disk(fsci->master_table_index[0], (long) DEFAULT_TABLE_SIZE, dir_table, 0x7e0);
split_path = string_split_c(path, '/', false);
number_of_traversal = split_path->length;
if (drop_filename)
{
number_of_traversal -= 1;
}
/* Start from the master table */
for (i = 0; i < number_of_traversal; ++i)
{
for (j = 0; j < DEFAULT_TABLE_SIZE; ++j)
{
/*
print_newline();
print("New: ");
print(dir_table->entries[j].filename);
print("vs ");
print(split_path->strings[i]->chars);
print_newline();
*/
if (strcmp(dir_table->entries[j].filename, split_path->strings[i]->chars) == 0)
{
long index_sector = dir_table->entries[j].data_pointer[0];
/* printf("Table index: %lu \n",index_sector ); */
/* print(dir_table->entries[j].filename); */
disk_service_read_data_from_disk(index_sector, (long) DEFAULT_TABLE_SIZE, dir_table, 0x7e0);
break;
}
}
}
return dir_table;
}
int lsfs_disk_read_data_from_file(file, buffer_size, data, offset_to_next_entry, data_segment)
lsfs_file *file;
unsigned int buffer_size;
char *data;
long offset_to_next_entry;
unsigned int data_segment;
{
unsigned int integer_file_size = file->size[0];
unsigned int integer_offset = offset_to_next_entry;
unsigned int integer_datapointer = 0;
unsigned int data_length = integer_file_size - integer_offset;
unsigned int amount_read = 0;
unsigned int amount_to_read = 0;
unsigned int remaining_offset = offset_to_next_entry;
void *next_data;
/* printf("READ: buffer_size: %d\n", buffer_size); */
/* printf("READ: Data length: %d\n", data_length); */
/* printf("READ: Offset length: %d\n", offset_to_next_entry); */
int data_pointer_index = 0; /* start at first data pointer. */
if (data_length > buffer_size)
{
data_length = buffer_size;
}
while(data_length > 0) /* We have more to write */
{
/* printf("READ: Remaing Data length: %d\n", data_length); */
if (remaining_offset == 0)
{
char *tmp_buffer = calloc(DEFAULT_DATA_POINTER_SIZE, SECTOR_SIZE);
/* assert(tmp_buffer); */
if (data_length < (DEFAULT_DATA_POINTER_SIZE * SECTOR_SIZE))
{
amount_to_read = data_length;
}
else
{
amount_to_read = (DEFAULT_DATA_POINTER_SIZE * SECTOR_SIZE);
}
/* disk_service_read_data_from_disk(lsfs_sector_offset index, uint32_t number_sector, void* data_buffer) */
integer_datapointer = file->data_pointer[data_pointer_index];
if (integer_datapointer == 0)
{
break;
}
next_data = data + amount_read;
disk_service_read_data_from_disk(file->data_pointer[data_pointer_index], (long) DEFAULT_DATA_POINTER_SIZE, next_data, data_segment);
/* memcpy((data + amount_read), data_segment, tmp_buffer, 0x7e0, amount_to_read); */
data_length -= amount_to_read;
amount_read += amount_to_read;
data_pointer_index = data_pointer_index + 2; /* Rember that we only use 32-bit, and thats why we jump to at a time*/
/* free(tmp_buffer); */
}
else if (remaining_offset < (DEFAULT_DATA_POINTER_SIZE * SECTOR_SIZE))
{
char *tmp_buffer = calloc(1, (DEFAULT_DATA_POINTER_SIZE * SECTOR_SIZE));
/* assert(tmp_buffer); */
if (data_length < ((DEFAULT_DATA_POINTER_SIZE * SECTOR_SIZE) - remaining_offset) )
{
amount_to_read = data_length;
}
else
{
amount_to_read = ((DEFAULT_DATA_POINTER_SIZE * SECTOR_SIZE) - remaining_offset);
}
disk_service_read_data_from_disk(file->data_pointer[data_pointer_index], (long) DEFAULT_DATA_POINTER_SIZE, tmp_buffer, 0x7e0);
memcpy(data, data_segment, (tmp_buffer + remaining_offset), 0x7e0, amount_to_read);
data_length -= amount_to_read;
amount_read += amount_to_read;
remaining_offset -= amount_to_read;
data_pointer_index = data_pointer_index + 2; /* Rember that we only use 32-bit, and thats why we jump to at a time*/
/* free(tmp_buffer); */
}
else
{
/* We have to skip a whole data pointer: */
remaining_offset -= (DEFAULT_DATA_POINTER_SIZE * SECTOR_SIZE);
data_pointer_index = data_pointer_index + 2;
}
}
/*
time_t current_time;
time ( &current_time );
file->access_time = current_time;
*/
return amount_read;
}
#endif