86       self.idx = self.size - amount
92     if self.idx > self.size:
93       self.idx = self.size
102   def __init__(self, fs, cluster, size=None):  argument
111     self.size = size
113     if self.size is None:
114       self.size = fs.get_chain_size(cluster)
118   def read(self, size):  argument
120     if self.idx + size > self.size:
121       size = self.size - self.idx
122     got = self.fs.read_file(self.start_cluster, self.idx, size)
131     if self.idx > self.size:
132       self.size = self.idx
154     to_read = self.backing.size / 32
169       size):  argument
182         longname, first_cluster, size)
220     size = 0
223       size = data.tell()
226     chunk = self.backing.fs.allocate(size) if size > 0 else 0
228     self.add_dentry(0, shortname, ext, name, chunk, size)
233     data_file = fat_file(self.backing.fs, chunk, size)
285       first_cluster, size):  argument
305     self.size = size
318     return self.name() + " (" + str(self.size) + \
328     return fat_file(self.fs, self.first_cluster, self.size)
392         self.size)
425     self.size = fs.root_entries * 32
431     if self.idx + count > self.size:
432       count = self.size - self.idx
442     if self.idx + len(data) > self.size:
443       data = data[:self.size - self.idx]
447     if self.idx > self.size:
448       self.size = self.idx
560     size = read_le_long(f)
572       size), consumed)
574   def read_file(self, head_cluster, start_byte, size):  argument
583     assert size >= 0, "Can't read a negative amount"
584     if size == 0:
590       size_now = size
591       if start_byte + size > self.bytes_per_cluster:
595         size -= size_now
606         if size == 0:
686     for cluster, size in grabbed_zones:
687       entries = range(cluster + 1, cluster + size)