Interchange File Format types - operator1/op1 GitHub Wiki

As per the Audio IFF spec, here is a reference of the types that are used:

Type	Description
char	8 bits, signed. A char can contain more than just ASCII characters. It can contain any number from -128 to 127 (inclusive).
unsigned char	8 bits, unsigned. Contains any number from zero to 255 (inclusive).
short	16 bits, signed. Contains any number from -32,768 to 32,767 (inclusive).
unsigned short	16 bits, unsigned. Contains any number from zero to 65,535 (inclusive).
long	32 bits, signed. Contains any number from -2,147,483,648 to 2,147,483,647 (inclusive).
unsigned long	32 bits, unsigned. Contains any number from zero to 4,294,967,295 (inclusive).
extended	80 bit IEEE Standard 754 floating point number (Standard Apple Numeric Environment [SANE] data type Extended).
pstring	Pascal-style string, a one byte count followed by text bytes. The total number of bytes in this data type should be even. A pad byte can be added at the end of the text to accomplish this. This pad byte is not reflected in the count.
ID	32 bits, the concatenation of four printable ASCII character in the range ' ' (SP, 0x20) through '~' (0x7E). Spaces (0x20) cannot precede printing characters; trailing spaces are allowed. Control characters are forbidden.
OSType	32 bits. A concatenation of four characters, as defined in Inside Macintosh, vol II.