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#! /bin/sh -e
#DIFF=zdc
DIFF=bsdiff
srcA=$1
srcB=$2
if test -z "$srcA" -o -z "$srcB"; then
echo "syntax: bdiff.sh srcA srcB"
exit 1
fi
(cd $srcB && find . -type f) | while read fn; do
if test -f "$srcA/$fn"; then
if ! test -f "$srcB/$fn"; then
echo "DELETE $fn"
else
if ! cmp "$srcA/$fn" "$srcB/$fn" > /dev/null; then
echo "FILE DELTA FOR $fn"
TMPFILE=/tmp/__bsdiff
$DIFF "$srcA/$fn" "$srcB/$fn" $TMPFILE
cat $TMPFILE
diffSize=$(stat -c '%s' $TMPFILE)
# For comparison.
bzipSize=$(bzip2 < "$srcB/$fn" | wc -m)
gain=$(echo "scale=2; ($diffSize - $bzipSize) / $bzipSize * 100" | bc)
ouch=$(if test "${gain:0:1}" != "-"; then echo "!"; fi)
printf "%7.2f %1s %10d %10d %s\n" \
"$gain" "$ouch" "$diffSize" "$bzipSize" "$fn" >&2
# echo "$fn -> $diffSize $bzipSize ==> $gain $ouch" >&2
rm $TMPFILE
fi
fi
# Note: be silent about unchanged files.
else
echo "NEW FILE $fn"
cat "$srcB/$fn"
fi
done
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