binhexedit

#!/bin/bash
if [ $# == 0 ]
then
   cat << EOF
binedit by Al Williams http://www.awce.com
Usage:
  binedit [--o offset] [--unfill byte size] [--obs blksize] [--line-length length] [editor_options] -r filename.ext

This calls a binary editor (bless by default)  after converting 
known file types to .bin for writing or converting bin files after reading.

--o: Offset for file conversion (see srec_cat)
--unfill: Unfil blocks of at least size of byte (see srec_cat)
--obs: Output block size (see srec_cat)
--line-length: Output line length max (see srec_cat)

Assumes bless and srec_cat are on the path.

NOTE: Some versions of bless will report they are out of space
when saving a file if the temporary directory is not set 
in the Edit | Preferences menu. Just set it to /tmp and
all will work! See https://bugs.launchpad.net/bless/+bug/876021


EOF
fi

BEDITOR=bless
# Options for bless
OPTS=
# The -r or -w
RWOPT=
# Real file name
FN=
# Extension provided
EXT=
# Options for srec_copy
SRECOPTS=
# Place to put stuff
TMPDIR=/tmp

# parse arguments and sort them out
while [ $# != 0 ]
do
# note --obs x becomes --obs=x
  if [ "$1" == "--obs" ]
  then
      SRECOPTS="$SRECOPTS $1=$2"
      shift
      shift
      continue
  fi
# note --line-length x becomes --line-length=x
  if [ "$1" == "--line-length" ]
  then
      SRECOPTS="$SRECOPTS $1=$2"
  fi
  if [ "$1" == "--unfill" ]
  then
      SRECOPTS="$SRECOPTS $1 $2 $3"
      shift
      shift
      shift
      continue
  fi
  if [ "$1" == "--offset" ] 
  then
      SRECOPTS="$SRECOPTS $1 $2"
      shift
      shift
      continue
  fi
  if [ "$1" == "-r" ] 
  then
    RWOPT=-r
    shift
    FN=$1
  else
    OPTS="$OPTS $1"
  fi
  shift
done
# Pick apart file name
filename=$(basename "$FN")
extension="${filename##*.}"
fileprefix="${filename%.*}"

# for each case decide the real file name (RFILE)
# and what you have to do before or after
# to get the right answer
case "$extension" in
bin)
# no conversion needed
RFILE="$FN"
PRECVT=
POSTCVT=
;;
hex)
RFILE="$TMPDIR/$$.bin"
PRECVT="srec_cat $FN --intel -o $SRECOPT $RFILE --binary"
POSTCVT="srec_cat $RFILE --binary $SRECOPTS -o $FN --intel"
;;
srec)
RFILE=$TMPDIR/$$.bin
PRECVT="srec_cat $FN --motorola -o $SRECOPT $RFILE --binary"
POSTCVT="srec_cat $RFILE --binary $SRECOPTS -o $FN --motorola"
;;
txt)  # special case
exec ${EDITOR:-nano} "$FN"
;;
*) 
# Who knows?
RFILE="$FN"
PRECVT=
POSTCVT=
esac
$PRECVT
bless $OPTS $RFILE
$POSTCVT