Fix read with offset

run/moros-fuse.py

@@ -136,18 +136,19 @@ def getattr(self, path, handle=None):
 
  def read(self, path, size, offset, handle):
  with self.rwlock:
- (kind, next_block_addr, size, time, name) = self.__scan(path)
- res = b""
+ (kind, next_block_addr, file_size, time, name) = self.__scan(path)
+ size = min(size, file_size - offset)
+ res = bytes()
  while next_block_addr != 0 and size > 0:
  self.image.seek(next_block_addr)
  next_block_addr = int.from_bytes(self.image.read(4), "big") * self.block_size
  if offset < self.block_size - 4:
- buf = self.image.read(max(0, min(self.block_size - 4, size)))
- res = b"".join([res, buf[offset:]])
+ buf = self.image.read(max(0, min(self.block_size - 4, size)))[offset:]
+ res += buf
+ size -= min(self.block_size - 4, len(buf))
  offset = 0
  else:
  offset -= self.block_size - 4
- size -= self.block_size - 4
  return res
 
  def readdir(self, path, handle):