def path_to_inode_number(path, directory):
if (plain_name(path)):
return file_name_layer.name_to_inode_number(path, directory)
else:
directory = file_name_layer.lookup(first(path), directory)
path = rest(path)
return path_to_inode_number(path, directory)
def cat(filename):
num_blocks = 0
pointer = 0
count = 0
inum = file_name_layer.lookup(filename, path_name_layer._wd)
i = inode_number.inode_number_to_inode(inum)
for b in i.blocks:
if (b != -1):
num_blocks += 1
buf = [""] * (blockLayer._block_size * num_blocks)
while(pointer < num_blocks):
block = blockLayer.block_number_to_block(i.blocks[pointer])
buf = block.read(0, buf, count, block.size)
pointer += 1
count += blockLayer._block_size
buf = "".join(buf)
print buf
def append(filename, writer):
inum = file_name_layer.lookup(filename, path_name_layer._wd)
i = inode_number.inode_number_to_inode(inum)
bnum = i.blocks[i.size - 1]
blk = blockLayer.block_number_to_block(bnum)
buf = list(writer)
b_start = 0
while (b_start < len(buf)):
while (blk.size < blockLayer._block_size):
if(b_start == len(writer)):
return 0
buf_string = "".join(buf[b_start])
blk.write(blk.size, buf_string, 0, 1)
b_start += 1
if(b_start < len(buf)):
bnum = i.add_block()
blk = blockLayer.block_number_to_block(bnum)
def rmdir(directory):
inum = file_name_layer.lookup(directory, path_name_layer._wd)
i = inode_number.inode_number_to_inode(inum)
if (i.inode_type == FileType.directory):
blockLayer.release_block(i.blocks[0])
inode_number.release_inode(inum)
inode_directory = inode_number.inode_number_to_inode(path_name_layer._wd)
block_directory = blockLayer.block_number_to_block(inode_directory.blocks[0])
buf = [""] * block_directory.size
buf = block_directory.read(0, buf, 0, block_directory.size)
buf = "".join(buf)
search = directory + "|" + str(inum) + ","
buf = buf.replace(search, "")
clear = "_" * 512
block_directory.write(0, clear, 0, len(clear))
block_directory.write(0, buf, 0, len(buf))
if(len(buf) == 0): # checks to see if the directory is now empty
block_directory.size = 0
else:
raise Exception("Inode %r is not of type directory." % inum)
def rm(filename):
num = 0
inum = file_name_layer.lookup(filename, path_name_layer._wd)
i = inode_number.inode_number_to_inode(inum)
for b in i.blocks:
if (b != -1):
blockLayer.release_block(i.blocks[num])
num += 1
inode_number.release_inode(inum)
inode_directory = inode_number.inode_number_to_inode(path_name_layer._wd)
block_directory = blockLayer.block_number_to_block(inode_directory.blocks[0])
buf = [""] * block_directory.size
buf = block_directory.read(0, buf, 0, block_directory.size)
buf = "".join(buf)
search = filename + "|" + str(inum) + ","
buf = buf.replace(search, "")
clear = "_" * 512
block_directory.write(0, clear, 0, len(clear))
block_directory.write(0, buf, 0, len(buf))
if(len(buf) == 0): # checks to see if the directory is now empty
block_directory.size = 0