Utils

class utils.FilePtr(fp, total_length=None, offset=0)

A wrapper for file object to maintain some more states during parsing.

• In file mode, total_length can be left None and will be read from file system.
• In streaming mode, you must provide total_length to specify the end of the stream.

Parameters:

• fp – Original file object.
• total_length – Length of this.
• offset – Offset to the original file.

close()

Set internal references to None.

Note that it will not close the original file object.

static get_file_length(fp)

Get length of the file from local file system.

read(n)

Read bytes.

Parameters:n – Count of bytes to read. Returns:Bytes.

restore_state()

Restore last internal state.

save_state()

Save internal state.

seek(pos, mode=0)

Seek position in sub file.

Parameters:

• pos – Position.
• mode – Seek mode.

tell()

Current position in sub file.

Returns:Current position.