#!/bin/sh
# (C) 2003-2007 Willem Jan Hengeveld <itsme@xs4all.nl>
# Web: http://www.xs4all.nl/~itsme/
#      http://wiki.xda-developers.com/
#
# $Id: $
#
# script to compress a gsm rom image, with bcl.sourceforge.net
# as found in recent HTC smartphones

blocksize=$[0x60000]
split -b $blocksize $1 _bcl
for i in _bcl*; do bcl c lz $i _y$i.nb >/dev/null; done
rm _bcl*
rm -f $2
args=
offset=0
for i in _y*.nb; do
    filesize=`wc -c<$i`
    args="$args `printf ' -pl %x:%s:%x:%x' $offset $i 0 $filesize`"
    offset=$[$offset+0x50000]
done
args="$args `printf ' -pb %x:00' $[$offset-1] `"
touch $2
hexedit $2 $args

# note : other method of creating aligned blocks:
# n=1
# for i in _y*.nb; do
# cat $i >> $2
# dd if=/dev/null bs=320k of=$2 seek=$n
# n=$[$n+1]
# done

rm _y*.nb