perl.pack.unpack.printf.cheat.sheet.doc

Perl pack/unpack Summary
Usage:
pack TEMPLATE, LIST
unpack TEMPLATE, EXPR
Template parameter summary:
Parameter
Description
a
A string with arbitrary binary data, will be null padded.
A
A text (ASCII) string, will be space padded.
Z
A null terminated (ASCIZ) string, will be null padded.
b
A bit string (ascending bit order inside each byte, like vec()).
B
A bit string (descending bit order inside each byte).
h
A hex string (low nibble first).
H
A hex string (high nibble first).
c
A signed char value.
C
An unsigned char value. Only does bytes. See U for Unicode.
s
A signed short value.
S
An unsigned short value. (This 'short' is _exactly_ 16 bits, which may differ from what a local piler calls 'short'. If you want native-length shorts, use the '!' suffix.)
i
A signed integer value.
I
An unsigned integer value. (This 'integer' is _at_least_ 32 bits wide. Its exact size depends on what a local piler calls 'int', and may even be larger than the 'long' described in the next item.)
l
A signed long value.
L
An unsigned long value. (This 'long' is _exactly_ 32 bits, which may differ from what a local piler calls 'long'. If you want native-length longs, use the '!' suffix.)
n
An unsigned short in "network" (big-endian) order.
N
An unsigned long in "network" (big-endian) order.
v
An unsigned short in "VAX" (little-endian) order.
V
An unsigned lo