The K Desktop Environment
The KPsion handbook
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Chapter 6. Internals

6.1. The backup files

The backup files, created by KPsion are simply gzipped tar files. The files follow the following naming scheme:

TYPE-YYYY-MO-DD-HH-MI-SS.tar.gz

where

TYPE

is a single character, representing the backup type. 'I' stands for incremental and 'F' stands for full.

YYYY

is the year of creation.

MO

is the month of creation.

DD

is the day of creation.

HH

is the hour of creation.

MI

is the minute of creation.

SS

is the second of creation.

The file names in the tar archives are converted to fit into general naming scheme. All occurences of the character '%' are changed into the string '%25', all ocurrences of '/' are changed into '%2f' and all occurences of '\' are changed into '/'.

In addition to the data files on the psion, every archive contains a special index file, where the original file attributes and the Psion's 64-bit hires filetime is stored. This file is named KPsionIncrementalIndex for incremental backups or KPsionFullIndex for full backups. The index file is stored in the archive's toplevel directory and is an ASCII file, containing one line per data file with the following fields:

hhhhhhhh llllllll ssssssss aaaaaaaa fn

where

hhhhhhhh

is an 8-digit hexadecimal number, representing the upper half of the file's modification time.

llllllll

is an 8-digit hexadecimal number, representing the lower half of the file's modification time.

ssssssss

is an 8-digit hexadecimal number, representing the size of the file.

aaaaaaaa

is an 8-digit hexadecimal number, representing the native attributes of the file.

fn

is the unconverted original absolute file name.

The first line of the index file contains a header of the following format:
#plpbackup index T

where

T

is a single character, representing the backup type. 'I' stands for incremental and 'F' stands for full.

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