Logo convertion tool

[Vidar Madsen]

Hi.

I whipped up a little script to convert PPM and PGM files to Nokia's NOL
and NGG formats. Now you can use GIMP, xpaint or whatever to make yourself
a logo. :) 

>From the source;

  # ppm2nokia v1.0 - Convert PPM/PGM files to Nokia's NOL or NGG format.
  #
  # (c) 2002 by Vidar Madsen - Free software - see the GPL for details.
  #
  # Usage: ppm2nokia [-i] < logo.ppm > logo.nol
  #
  # Only raw PPM and PGM files are supported.
  #
  # Output format will be selected automatically based on the geometry
  # of the input image. Currently, 78x21 means NOL, and 72x14 means NGG.
  #
  # Verify the output file with;  gnokii --viewlogo logo.nol
  # Send it to your phone with;   gnokii --setlogo op logo.nol

Hope you like it. :)

Vidar

#!/bin/sh
#
# ppm2nokia v1.0 - Convert PPM/PGM files to Nokia's NOL or NGG format.
#
# (c) 2002 by Vidar Madsen - Free software - see the GPL for details.
#
# Usage: ppm2nokia [-i] < logo.ppm > logo.nol
#
# Only raw PPM and PGM files are supported.
#
# Output format will be selected automatically based on the geometry
# of the input image. Currently, 78x21 means NOL, and 72x14 means NGG.
#
# Verify the output file with;  gnokii --viewlogo logo.nol
# Send it to your phone with;   gnokii --setlogo op logo.nol
#
# Have fun. :)
# -- Vidar

black=1
white=0

while [ "$1" != "" ]; do
  arg="$1"
  shift
  if [ "$arg" = "-i" ]; then black=0; white=1; continue; fi
  echo "ppm2nokia: Unknown argument \"$arg\"" >&2
  exit
done

function readline {
  while true; do
    read line
    if [ "${line:0:1}" != "#" ]; then break; fi
  done
}

readline
if [ "$line" == "P6" ]; then
  ppm=true
elif [ "$line" == "P5" ]; then
  ppm=false
else
  echo "ppm2nokia: PPM/PGM marker not found ($line)." >&2
  exit
fi

readline
set -f -- $line
size="${1}x${2}"
pad=$[((($1*$2)+7)/8)*8 - ($1*$2)]
if [ "$size" == "78x21" ]; then
  hdr='NOL\x00\x01\x00\xF2\x00\x01\x00\x4E\x00\x15\x00\x01\x00\x01\x00\x00\x00'
elif [ "$size" == "72x14" ]; then
  hdr='NGG\x00\x01\x00\x48\x00\x0E\x00\x01\x00\x01\x00\x00\x00'
else
  echo "ppm2nokia: Invalid size (${size}). Only 78x21 and 72x14 is supported." 
>&2
  exit
fi

readline
if [ "$line" != "255" ]; then
  echo "ppm2nokia: Invalid depth ($line)." >&2
  exit
fi

echo -ne $hdr

cat | tr '\000-\177\200-\377' "[$black*128][$white*128]" | \
        if $ppm; then sed 's/\(.\)../\1/g'; else cat; fi

# Pad file to multiple of 8 bytes
printf "%0${pad}d" 0