#!/bin/sh

# (c) Ricardas Cepas <rch@pub.osf.lt>. Copying policy: GNU GPL V2.

set -o errexit

#set -x

if [ $# != 1 ]

then	echo '  Usage: psfsplit <psf_bitmap_font_filename> '

	exit

fi

if [ `hexdump -e '/2 "%X" ' -n2 $1 ` != "436" ]

then	echo $1 -- non .psf file

	exit

fi

size=`hexdump -e '/1 "%i" ' -n1 -s2 $1 `

size=$[ ($size % 2 + 1) * 256 ]

height=`hexdump -e '/1 "%i" ' -n1 -s3 $1 `

echo $size chars, height=$height

mkdir $1_

dd bs=4 count=1 if=$1 of=$1_/#psf_header &>/dev/null

i=0

while let $[ i < $size ]

do

	dd bs=1 count=$height skip=$[ $i * $height + 4 ] if=$1 \

		of=$1_/`printf "%.3x" $i` &>/dev/null

	let i+=1

done

dd bs=1 skip=$[ $i * $height + 4 ] if=$1 of=$1_/map_tables &>/dev/null