EcchiShell v1.0

usr

lib64

' else: strflag = '<' self.file = file self.chunkname = file.read(4) if len(self.chunkname) < 4: raise EOFError try: self.chunksize = struct.unpack(strflag+'L', file.read(4))[0] except struct.error: raise EOFError if inclheader: self.chunksize = self.chunksize - 8 # subtract header self.size_read = 0 try: self.offset = self.file.tell() except (AttributeError, IOError): self.seekable = False else: self.seekable = True def getname(self): """Return the name (ID) of the current chunk.""" return self.chunkname def getsize(self): """Return the size of the current chunk.""" return self.chunksize def close(self): if not self.closed: self.skip() self.closed = True def isatty(self): if self.closed: raise ValueError, "I/O operation on closed file" return False def seek(self, pos, whence=0): """Seek to specified position into the chunk. Default position is 0 (start of chunk). If the file is not seekable, this will result in an error. """ if self.closed: raise ValueError, "I/O operation on closed file" if not self.seekable: raise IOError, "cannot seek" if whence == 1: pos = pos + self.size_read elif whence == 2: pos = pos + self.chunksize if pos < 0 or pos > self.chunksize: raise RuntimeError self.file.seek(self.offset + pos, 0) self.size_read = pos def tell(self): if self.closed: raise ValueError, "I/O operation on closed file" return self.size_read def read(self, size=-1): """Read at most size bytes from the chunk. If size is omitted or negative, read until the end of the chunk. """ if self.closed: raise ValueError, "I/O operation on closed file" if self.size_read >= self.chunksize: return '' if size < 0: size = self.chunksize - self.size_read if size > self.chunksize - self.size_read: size = self.chunksize - self.size_read data = self.file.read(size) self.size_read = self.size_read + len(data) if self.size_read == self.chunksize and \ self.align and \ (self.chunksize & 1): dummy = self.file.read(1) self.size_read = self.size_read + len(dummy) return data def skip(self): """Skip the rest of the chunk. If you are not interested in the contents of the chunk, this method should be called so that the file points to the start of the next chunk. """ if self.closed: raise ValueError, "I/O operation on closed file" if self.seekable: try: n = self.chunksize - self.size_read # maybe fix alignment if self.align and (self.chunksize & 1): n = n + 1 self.file.seek(n, 1) self.size_read = self.size_read + n return except IOError: pass while self.size_read < self.chunksize: n = min(8192, self.chunksize - self.size_read) dummy = self.read(n) if not dummy: raise EOFError