MANUAL FOR UNZIP (BBC BASIC)

This file describes the program UNZIP which opens and extracts the contents
of a ZIP file into the currently selected directory.
The manual and software are (C)1999 SPROW

INSTRUCTIONS-
At the BASIC prompt,type CHAIN"UNZIP"

The program will then ask for the source filename of the ZIP file.Enter this.

After some checks have been made on the ZIP file then the stored files will be
unpacked to the currently selected directory,telling you also the date they were
stored on and a CRC number.

KNOWN PROBLEMS/FUTURE ENHANCEMENTS-
No known problems
The ability to add files to the archive would be handy.
The checksum is not currently used.

EXIT MESSAGES-
File not found - the specified source file could not be opened
Not a ZIP file - the specified start file did not start with the ZIP id
Only stored files can be unZIPed - compression is not handled
Not enough memory for extras field - the extras field exceeded 128 bytes
Extras field not written on an Acorn - the extras field contains the load and
                                       exec addresses but these are missing so
                                       they will be set to &00001900 &FFFF8023
Extras field of an unknown format - the extras field contains the load and
                                    exec addresses but these are missing so
                                    they will be set to &00001900 &FFFF8023

HISTORY-
1.00 Original to replace the inflexible RPSencoding file format on my webpages
1.01 If the 'extras' field was missing the extracted file was 1 byte too small
