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OS_File_System.py
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583 lines (538 loc) · 39.6 KB
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from math import ceil
import gc
#from pyautogui import typewrite
import curses
import npyscreen
import os
from tkinter import *
sector_size = 512
number_of_sectors = 1000
free_disk_space={x:True for x in range(0,number_of_sectors)}
hard_disk=[None for x in range(0,number_of_sectors)]
sectors_occupied=0
data_sectors=0
dir_sectors=0
dir_sectors_obj_track={}
file_seek_position={}
class DataSector:
def __init__(self):
self.forward_sector=0
self.backward_sector=0
self.sector_data=[]
def initializeForwardPointer(self, forward_pointer):
self.forward_sector=forward_pointer
def initializeBackwardPointer(self, backward_pointer):
self.backward_sector=backward_pointer
def initializeSectorData(self, sector_data):
self.sector_data.clear()
self.sector_data.extend(sector_data)
class DirectorySector:
forward_sector=0
backward_sector=0
filler=""
empty_space=""
number_of_records=0
dir_data=[]
if __name__ == "__main__":
os.system('clear')
root_dir = DirectorySector()
root_dir.backward_sector=-1
root_dir.forward_sector=-1
root_dir.filler=""
root_dir.empty_space=""
hard_disk[0]=root_dir
#sectors_occupied+=1
dir_sectors_obj_track[root_dir]=0
free_disk_space[0]=False
print('Below are the valid commands and their syntax')
print('\ncommand: exit -- exits the file system program -- syntax: exit')
print('\ncommand: ls -- lists all the files on the disk -- syntax: ls')
print('\ncommand: vi -- creates a new file if the file does not exist else a prompt is shown to edit existing file -- syntax: vi <file_name_with_extension>')
print('\ncommand: del -- deletes the mention file -- syntax: del <file_name_with_extension>')
print('\ncommand: seek -- moves the pointer of the file to given position and prints data from that position to end -- syntax: seek <file_name_with_extension> <pointer_position>')
print('\n--seek -> gives an error if the position of the cursor goes out of bounds')
print('\ncommand: cat -- prints the contents of the file -- syntax: cat <file_name_with_extension>')
print('\ncommand: clear -- clears the terminal -- syntax: clear')
print('\ncommand: help -- lists all the commands -- syntax: help\n')
while(1):
cmd = input('Akshay/filesystemcode> ')
if cmd=="exit":
hard_disk.clear()
exit()
else:
if cmd=="ls":
#print(hard_disk)
for ob in gc.get_objects():
if isinstance(ob, DirectorySector):
#print(str(ob.forward_sector)+" "+str(ob.backward_sector))
#print(ob.dir_data)
for x in ob.dir_data:
if x[0]=="u":
print(x[1]+" "+str(x[3]))
elif cmd.startswith("vi"):
forward_pointer_list=[]
backward_pointer_list=[]
file_exists=False
new_filename = cmd.split(' ')[1]
for ob in gc.get_objects():
if isinstance(ob, DirectorySector):
for x in ob.dir_data:
if x[1]==new_filename and x[0]!='A':
file_exists=True
input_selection=input('File already exists, do you want to edit it? (Y/N): ')
if input_selection=="N":
pass
else:
current_file_editing_data=""
if hard_disk[x[2]].forward_sector==-1:
current_sector_data=(hard_disk[x[2]].sector_data)[:]
current_file_editing_data=''.join(current_sector_data)
else:
#print("inside")
file_sector_track=x[2]
current_sector_data=(hard_disk[file_sector_track].sector_data)[:]
ccurrent_file_editing_data=''.join(current_sector_data)
while hard_disk[file_sector_track].forward_sector!=-1:
current_file_editing_data+=''.join((hard_disk[file_sector_track].sector_data)[:])
file_sector_track=hard_disk[file_sector_track].forward_sector
current_file_editing_data+=''.join((hard_disk[file_sector_track].sector_data)[:])
#print(current_file_editing_data)
stdscr = curses.initscr()
curses.noecho() # Disable automatic echoing of keys to the screen
curses.cbreak() # Take input without requiring Enter key
stdscr.keypad(True)
F = npyscreen.Form(name="Text Editor")
my_text = F.add(npyscreen.Textfield, value=current_file_editing_data)
# Display the form
F.edit()
curses.endwin()
file_data = list(my_text.value)
number_of_sectors_required = ceil(len(file_data)/504)
#print(number_of_sectors_required)
if number_of_sectors_required==1 and hard_disk[x[2]].forward_sector==-1:
hard_disk[x[2]].sector_data.clear()
temp_hold=file_data[0:len(file_data)]
hard_disk[x[2]].sector_data.extend(temp_hold)
x[3]=len(file_data)
else:
if hard_disk[x[2]].forward_sector==-1:
number_of_sectors_required-=1
current_sectors_indexes=[]
current_sectors_indexes.append(x[2])
prev_index=0
count_temp=0
prev_sector=x[2]
backward_pointer_list.append(-1)
for disk_space_index in range(1,len(hard_disk)):
if hard_disk[disk_space_index]==None and free_disk_space[disk_space_index]==True and count_temp<number_of_sectors_required:
if count_temp==0:
current_sectors_indexes.append(disk_space_index)
free_disk_space[disk_space_index]=False
forward_pointer_list.append(disk_space_index)
backward_pointer_list.append(prev_sector)
prev_sector=disk_space_index
count_temp+=1
else:
current_sectors_indexes.append(disk_space_index)
free_disk_space[disk_space_index]=False
forward_pointer_list.append(disk_space_index)
backward_pointer_list.append(prev_sector)
prev_sector=disk_space_index
count_temp+=1
forward_pointer_list.append(-1)
prev_index=0
for sector_index in range(len(current_sectors_indexes)):
if sector_index==0:
hard_disk[x[2]].sector_data.clear()
hard_disk[x[2]].sector_data.extend(file_data[prev_index:prev_index+504])
hard_disk[x[2]].forward_sector=forward_pointer_list[sector_index]
x[3]=len(file_data)
prev_index+=504
if sector_index<len(current_sectors_indexes)-1:
file = DataSector()
file.initializeBackwardPointer(backward_pointer_list[sector_index])
file.initializeForwardPointer(forward_pointer_list[sector_index])
file.initializeSectorData(file_data[prev_index:prev_index+504])
hard_disk[current_sectors_indexes[sector_index]]=file
prev_index+=504
else:
file=DataSector()
file.initializeBackwardPointer(backward_pointer_list[sector_index])
file.initializeBackwardPointer(forward_pointer_list[sector_index])
file.initializeSectorData(file_data[prev_index:len(file_data)])
hard_disk[current_sectors_indexes[sector_index]]=file
else:
current_sectors_indexes=[]
file_sector_track=x[2]
current_sectors_indexes.append(x[2])
while file_sector_track!=-1:
if hard_disk[hard_disk[file_sector_track].forward_sector].forward_sector!=-1:
current_sectors_indexes.append(hard_disk[file_sector_track].forward_sector)
file_sector_track=hard_disk[hard_disk[file_sector_track].forward_sector].forward_sector
else:
current_sectors_indexes.append(hard_disk[file_sector_track].forward_sector)
file_sector_track=-1
#print(current_sectors_indexes)
if len(current_sectors_indexes) == number_of_sectors_required:
for i in range(number_of_sectors_required):
if i!=number_of_sectors_required-1:
hard_disk[current_sectors_indexes[i]].sector_data.clear()
temp_hold=file_data[prev_index:prev_index+504]
hard_disk[current_sectors_indexes[i]].sector_data.extend(temp_hold)
prev_index+=504
else:
hard_disk[current_sectors_indexes[i]].sector_data.clear()
temp_hold=file_data[prev_index:len(file_data)]
hard_disk[current_sectors_indexes[i]].sector_data.extend(temp_hold)
x[3]=len(file_data)
elif len(current_sectors_indexes) < number_of_sectors_required:
number_of_sectors_required-=len(current_sectors_indexes)
count_temp=0
for disk_space_index in range(1,len(hard_disk)):
if hard_disk[disk_space_index]==None and free_disk_space[disk_space_index]==True and count_temp<number_of_sectors_required:
current_sectors_indexes.append(disk_space_index)
count_temp+=1
else:
if count_temp==number_of_sectors_required:
break
#print(current_sectors_indexes)
forward_pointer_list.clear()
backward_pointer_list.clear()
for i in range(len(current_sectors_indexes)):
if i==0:
forward_pointer_list.append(current_sectors_indexes[i+1])
backward_pointer_list.append(-1)
elif i==len(current_sectors_indexes)-1:
forward_pointer_list.append(-1)
backward_pointer_list.append(current_sectors_indexes[i-1])
else:
forward_pointer_list.append(current_sectors_indexes[i+1])
backward_pointer_list.append(current_sectors_indexes[i-1])
#print(forward_pointer_list)
#print(backward_pointer_list)
for i in range(len(current_sectors_indexes)):
if i!=len(current_sectors_indexes)-1:
if hard_disk[current_sectors_indexes[i]]!=None:
hard_disk[current_sectors_indexes[i]].sector_data.clear()
hard_disk[current_sectors_indexes[i]].forward_sector=forward_pointer_list[i]
hard_disk[current_sectors_indexes[i]].backward_sector=backward_pointer_list[i]
temp_hold=file_data[prev_index:prev_index+504]
hard_disk[current_sectors_indexes[i]].sector_data.extend(temp_hold)
prev_index+=504
else:
temp_hold=file_data[prev_index:prev_index+504]
file = DataSector()
file.initializeForwardPointer(forward_pointer_list[i])
file.initializeBackwardPointer(backward_pointer_list[i])
file.initializeSectorData(temp_hold)
hard_disk[current_sectors_indexes[i]]=file
free_disk_space[current_sectors_indexes[i]]=False
prev_index+=504
else:
if hard_disk[current_sectors_indexes[i]]!=None:
hard_disk[current_sectors_indexes[i]].sector_data.clear()
hard_disk[current_sectors_indexes[i]].forward_sector=forward_pointer_list[i]
hard_disk[current_sectors_indexes[i]].backward_sector=backward_pointer_list[i]
temp_hold=file_data[prev_index:len(file_data)]
hard_disk[current_sectors_indexes[i]].sector_data.extend(temp_hold)
else:
temp_hold=file_data[prev_index:len(file_data)]
file = DataSector()
file.initializeForwardPointer(forward_pointer_list[i])
file.initializeBackwardPointer(backward_pointer_list[i])
file.initializeSectorData(temp_hold)
hard_disk[current_sectors_indexes[i]]=file
free_disk_space[current_sectors_indexes[i]]=False
elif len(current_sectors_indexes) > number_of_sectors_required:
prev_index=0
for i in range(len(current_sectors_indexes)):
if i<number_of_sectors_required:
if i!=number_of_sectors_required-1:
temp_hold=file_data[prev_index:prev_index+504]
hard_disk[current_sectors_indexes[i]].sector_data.clear()
hard_disk[current_sectors_indexes[i]].sector_data.extend(temp_hold)
prev_index+=504
else:
temp_hold=file_data[prev_index:len(file_data)]
hard_disk[current_sectors_indexes[i]].forward_pointer=-1
hard_disk[current_sectors_indexes[i]].sector_data.clear()
hard_disk[current_sectors_indexes[i]].sector_data.extend(temp_hold)
else:
del hard_disk[current_sectors_indexes[i]]
hard_disk[current_sectors_indexes[i]]=None
free_disk_space[current_sectors_indexes[i]]=True
x[3]=len(file_data)
if not file_exists:
file_data = list(input())
if len(file_data)>504:
current_sectors_indexes=[]
prev_index=0
count_temp=0
prev_sector=0
backward_pointer_list.append(-1)
number_of_sectors_required = ceil(len(file_data)/504)
for disk_space_index in range(1,len(hard_disk)):
if hard_disk[disk_space_index]==None and free_disk_space[disk_space_index]==True and count_temp<number_of_sectors_required:
if count_temp==0:
current_sectors_indexes.append(disk_space_index)
free_disk_space[disk_space_index]=False
#forward_pointer_list.append(disk_space_index)
backward_pointer_list.append(disk_space_index)
prev_sector=disk_space_index
count_temp+=1
elif count_temp==number_of_sectors_required-1:
current_sectors_indexes.append(disk_space_index)
free_disk_space[disk_space_index]=False
forward_pointer_list.append(disk_space_index)
forward_pointer_list.append(-1)
#backward_pointer_list.append(prev_sector)
count_temp+=1
elif count_temp<number_of_sectors_required:
current_sectors_indexes.append(disk_space_index)
free_disk_space[disk_space_index]=False
forward_pointer_list.insert(len(forward_pointer_list)-1,disk_space_index)
backward_pointer_list.append(prev_sector)
prev_sector=disk_space_index
count_temp+=1
else:
break
if len(root_dir.dir_data)<30:
root_dir.dir_data.append(['u',new_filename,current_sectors_indexes[0],len(file_data)])
root_dir.number_of_records+=1
dir_sectors_obj_track[root_dir]=root_dir.number_of_records
for pointer in range(number_of_sectors_required):
if pointer<number_of_sectors_required-1:
file = DataSector()
file.initializeForwardPointer(forward_pointer_list[pointer])
file.initializeBackwardPointer(backward_pointer_list[pointer])
temp_hold=file_data[prev_index:prev_index+504]
file.initializeSectorData(temp_hold[:])
hard_disk[current_sectors_indexes[pointer]]=file
prev_index+=504
else:
file1 = DataSector()
file1.initializeForwardPointer(forward_pointer_list[pointer])
file1.initializeBackwardPointer(backward_pointer_list[pointer])
temp_hold1=file_data[prev_index:len(file_data)]
file1.initializeSectorData(temp_hold1[:])
hard_disk[current_sectors_indexes[pointer]]=file1
else:
for key,value in dir_sectors_obj_track.items():
if value==31:
continue
elif value==30:
prev_sector_pointer=0
for i in range(len(hard_disk)):
if hard_disk[i]==key:
prev_sector_pointer=i
dir_general = DirectorySector()
dir_general.backward_sector=prev_sector_pointer
dir_general.forward_sector=-1
dir_general.filler=""
dir_general.empty_space=""
for disk_space_index in range(0,len(hard_disk)):
if hard_disk[disk_space_index] == None and free_disk_space[disk_space_index]==True:
key.dir_data.append(['d','d'+str(disk_space_index),disk_space_index,512])
key.forward_sector=disk_space_index
key.number_of_records+=1
dir_sectors_obj_track[key]=key.number_of_records
hard_disk[disk_space_index]=dir_general
free_disk_space[disk_space_index]=False
dir_general.dir_data.append(['u',new_filename,current_sectors_indexes[0],len(file_data)])
dir_general.number_of_records+=1
dir_sectors_obj_track[dir_general]=dir_general.number_of_records
break
for pointer in range(number_of_sectors_required):
if pointer<number_of_sectors:
file = DataSector()
file.initializeForwardPointer(forward_pointer_list[pointer])
file.initializeBackwardPointer(backward_pointer_list[pointer])
file.initializeSectorData(file_data[prev_index:prev_index+504])
hard_disk[current_sectors_indexes[pointer]]=file
prev_index+=504
else:
file=DataSector()
file.initializeForwardPointer(forward_pointer_list[pointer])
file.initializeBackwardPointer(backward_pointer_list[pointer])
file.initializeSectorData(file_data[prev_index:len(file_data)])
hard_disk[current_sectors_indexes[pointer]]=file
break
else:
key.dir_data.append(['u',new_filename,current_sectors_indexes[0],len(file_data)])
key.number_of_records+=1
dir_sectors_obj_track[key]=key.number_of_records
for pointer in range(number_of_sectors_required):
if pointer<number_of_sectors:
file = DataSector()
file.initializeForwardPointer(forward_pointer_list[pointer])
file.initializeBackwardPointer(backward_pointer_list[pointer])
file.initializeSectorData(file_data[prev_index:prev_index+504])
hard_disk[current_sectors_indexes[pointer]]=file
prev_index+=504
else:
file=DataSector()
file.initializeForwardPointer(forward_pointer_list[pointer])
file.initializeBackwardPointer(backward_pointer_list[pointer])
file.initializeSectorData(file_data[prev_index:len(file_data)])
hard_disk[current_sectors_indexes[pointer]]=file
break
else:
if len(root_dir.dir_data)<30:
file = DataSector()
file.initializeBackwardPointer(-1)
file.initializeForwardPointer(-1)
file.initializeSectorData(file_data)
for disk_space_index in range(0,len(hard_disk)):
if hard_disk[disk_space_index] == None and free_disk_space[disk_space_index]==True:
free_disk_space[disk_space_index]=False
hard_disk[disk_space_index]=file
root_dir.dir_data.append(['u',new_filename,disk_space_index,len(file_data)])
root_dir.number_of_records+=1
dir_sectors_obj_track[root_dir]=root_dir.number_of_records
break
else:
for key,value in dir_sectors_obj_track.items():
if value==31:
continue
elif value==30:
for i in range(len(hard_disk)):
if hard_disk[i]==key:
prev_sector_pointer=i
dir_general = DirectorySector()
dir_general.backward_sector=prev_sector_pointer
dir_general.forward_sector=-1
dir_general.filler=""
dir_general.empty_space=""
for disk_space_index in range(0,len(hard_disk)):
if hard_disk[disk_space_index] == None and free_disk_space[disk_space_index]==True:
key.dir_data.append(['d','d'+str(disk_space_index),disk_space_index,512])
key.forward_sector=disk_space_index
key.number_of_records+=1
dir_sectors_obj_track[key]=key.number_of_records
hard_disk[disk_space_index]=dir_general
free_disk_space[disk_space_index]=False
file = DataSector()
file.initializeBackwardPointer(-1)
file.initializeForwardPointer(-1)
file.initializeSectorData(file_data)
for disk_space_index in range(0,len(hard_disk)):
if hard_disk[disk_space_index] == None and free_disk_space[disk_space_index]==True:
free_disk_space[disk_space_index]=False
hard_disk[disk_space_index]=file
dir_general.dir_data.append(['u',new_filename,disk_space_index,len(file_data)])
dir_general.number_of_records+=1
dir_sectors_obj_track[dir_general]=dir_general.number_of_records
break
else:
file = DataSector()
file.initializeBackwardPointer(-1)
file.initializeForwardPointer(-1)
file.initializeSectorData(file_data)
for disk_space_index in range(0,len(hard_disk)):
if hard_disk[disk_space_index] == None and free_disk_space[disk_space_index]==True:
free_disk_space[disk_space_index]=False
hard_disk[disk_space_index]=file
key.dir_data.append(['u',new_filename,disk_space_index,len(file_data)])
key.number_of_records+=1
dir_sectors_obj_track[key]=key.number_of_records
break
elif cmd.startswith("del"):
file_found=False
file_name = cmd.split(' ')[1]
for ob in gc.get_objects():
if isinstance(ob, DirectorySector):
for f_name in ob.dir_data:
if f_name[1]==file_name and f_name[0]!='A':
file_found=True
f_name[0]='A'
if hard_disk[f_name[2]].forward_sector==-1:
del hard_disk[f_name[2]]
hard_disk[f_name[2]]=None
free_disk_space[f_name[2]]=True
f_name[3]=0
break
else:
current_sectors_indexes=[]
current_sectors_indexes.append(f_name[2])
c_forward_sector=hard_disk[f_name[2]].forward_sector
while c_forward_sector!=-1:
current_sectors_indexes.append(c_forward_sector)
c_forward_sector=hard_disk[c_forward_sector].forward_sector
for i in range(len(current_sectors_indexes)):
del hard_disk[current_sectors_indexes[i]]
hard_disk[current_sectors_indexes[i]]=None
free_disk_space[current_sectors_indexes[i]]=True
f_name[3]=0
break
if not file_found:
print("File not found!")
elif cmd.startswith("seek"):
file_found=False
file_name = cmd.split(' ')[1]
seek_position = int(cmd.split(' ')[2])
for ob in gc.get_objects():
if isinstance(ob, DirectorySector):
for f_name in ob.dir_data:
if f_name[1]==file_name and f_name[0]!='A':
file_found=True
if seek_position<=f_name[3] and seek_position>0:
file_seek_position[file_name]=seek_position
current_file_editing_data=""
if hard_disk[f_name[2]].forward_sector==-1:
current_sector_data=(hard_disk[f_name[2]].sector_data)[:]
current_file_editing_data=''.join(current_sector_data)
else:
file_sector_track=f_name[2]
current_sector_data=(hard_disk[file_sector_track].sector_data)[:]
ccurrent_file_editing_data=''.join(current_sector_data)
while hard_disk[file_sector_track].forward_sector!=-1:
current_file_editing_data+=''.join((hard_disk[file_sector_track].sector_data)[:])
file_sector_track=hard_disk[file_sector_track].forward_sector
current_file_editing_data+=''.join((hard_disk[file_sector_track].sector_data)[:])
print(current_file_editing_data[seek_position:])
break
else:
print("Pointer position goes out of bounds!")
break
if not file_found:
print("File not found!")
elif cmd.startswith("cat"):
file_found=False
file_name = cmd.split(' ')[1]
for ob in gc.get_objects():
if isinstance(ob, DirectorySector):
for f_name in ob.dir_data:
if f_name[1]==file_name and f_name[0]!='A':
file_found=True
current_file_editing_data=""
if hard_disk[f_name[2]].forward_sector==-1:
current_sector_data=(hard_disk[f_name[2]].sector_data)[:]
current_file_editing_data=''.join(current_sector_data)
else:
file_sector_track=f_name[2]
current_sector_data=(hard_disk[file_sector_track].sector_data)[:]
ccurrent_file_editing_data=''.join(current_sector_data)
while hard_disk[file_sector_track].forward_sector!=-1:
current_file_editing_data+=''.join((hard_disk[file_sector_track].sector_data)[:])
file_sector_track=hard_disk[file_sector_track].forward_sector
current_file_editing_data+=''.join((hard_disk[file_sector_track].sector_data)[:])
print(current_file_editing_data)
break
if not file_found:
print("File not found!")
elif cmd.startswith("help"):
print('\n\nBelow are the valid commands and their syntax')
print('\ncommand: exit -- exits the file system program -- syntax: exit')
print('\ncommand: ls -- lists all the files on the disk -- syntax: ls')
print('\ncommand: vi -- creates a new file if the file does not exist else a prompt is shown to edit existing file -- syntax: vi <file_name_with_extension>')
print('\ncommand: del -- deletes the mention file -- syntax: del <file_name_with_extension>')
print('\ncommand: seek -- moves the pointer of the file to given position and prints data from that position to end -- syntax: seek <file_name_with_extension> <pointer_position>')
print('\n--seek -> gives an error if the position of the cursor goes out of bounds')
print('\ncommand: cat -- prints the contents of the file -- syntax: cat <file_name_with_extension>')
print('\ncommand: clear -- clears the terminal -- syntax: clear\n')
elif cmd.startswith("clear"):
os.system('clear')
elif cmd=="":
pass
else:
print("Command not found!")