This module provides an interface for reading files that use EA IFF 85 chunks.14.1 This format is used in at least the Audio Interchange File Format (AIFF/AIFF-C), the Real Media File Format (RMFF), and the Tagged Image File Format (TIFF).
A chunk has the following structure:
|4||4||Size of chunk in big-endian byte order, including the header|
|8||n||Data bytes, where n is the size given in the preceeding field|
|8 + n||0 or 1||Pad byte needed if n is odd and chunk alignment is used|
The ID is a 4-byte string which identifies the type of chunk.
The size field (a 32-bit value, encoded using big-endian byte order) gives the size of the whole chunk, including the 8-byte header.
Usually an IFF-type file consists of one or more chunks. The proposed usage of the Chunk class defined here is to instantiate an instance at the start of each chunk and read from the instance until it reaches the end, after which a new instance can be instantiated. At the end of the file, creating a new instance will fail with a EOFError exception.
A Chunk object supports the following methods:
The remaining methods will raise IOError if called after the close() method has been called.
0(absolute file positioning); other values are
1(seek relative to the current position) and
2(seek relative to the file's end). There is no return value. If the underlying file does not allow seek, only forward seeks are allowed.
''. 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.