busybox/applets/usage_compressed

#!/bin/sh

target="$1"
loc="$2"

test "$target" || exit 1
test "$loc" || loc=.
test -x "$loc/usage" || exit 1
test "$SED" || SED=sed
test "$DD" || DD=dd

# Some people were bitten by their system lacking a (proper) od
od -v -b </dev/null >/dev/null
if test $? != 0; then
	echo 'od tool is not installed or cannot accept "-v -b" options'
	exit 1
fi

exec >"$target.$$"

echo '#define UNPACKED_USAGE "" \'
"$loc/usage" | od -v -b \
| grep -v '^ ' \
| $SED -e 's/^[^ ]*//' \
	-e 's/ //g' \
	-e '/^$/d' \
	-e 's/\(...\)/\\\1/g' \
	-e 's/^/"/' \
	-e 's/$/" \\/'
echo ''
# "grep -v '^ '" is for toybox's od bug: od -b prints some extra lines:
#0000000 010 000 010 000 133 055 144 146 135 040 133 055 143 040 103 117
#         000010 000010 026533 063144 020135 026533 020143 047503
#0000020 116 106 104 111 122 135 040 133 055 154 040 114 117 107 106 111
#         043116 044504 056522 055440 066055 046040 043517 044506
#0000040 114 105 135 040 133 055 141 040 101 103 124 111 117 116 106 111
#         042514 020135 026533 020141 041501 044524 047117 044506

echo "#define UNPACKED_USAGE_LENGTH `$loc/usage | wc -c`"
echo

echo '#define PACKED_USAGE \'
## Breaks on big-endian systems!
## # Extra effort to avoid using "od -t x1": -t is not available
## # in non-CONFIG_DESKTOPed busybox od
##
## "$loc/usage" | bzip2 -1 | od -v -x \
## | $SED -e 's/^[^ ]*//' \
##	-e 's/ //g' \
##	-e '/^$/d' \
##	-e 's/\(..\)\(..\)/0x\2,0x\1,/g'
##	-e 's/$/ \\/'
"$loc/usage" | bzip2 -1 | $DD bs=2 skip=1 2>/dev/null | od -v -b \
| grep -v '^ ' \
| $SED -e 's/^[^ ]*//' \
	-e 's/ //g' \
	-e '/^$/d' \
	-e 's/\(...\)/0\1,/g' \
	-e 's/$/ \\/'
echo ''

mv -- "$target.$$" "$target"