#!/bin/bash
# By Ashok Argent-Katwala <http://ashok.videdot.com/>. No rights reserved, do with it as you please.

# v0.6

# If the sfv is correct, this script says nothing and exits

if [ `sed --version >/dev/null 2>/dev/null && echo 1` ]; then
    sed='sed -r' # GNU sed (e.g. on Linux)
else
    sed='sed -E' # BSD sed (e.g. on Mac OS X)
fi

if [ -z "$1" ]; then
    echo 1>&2 "Usage: $0 sfvfile"
    exit 1
fi

if [ ! -f "$1" ]; then
    echo 1>&2 "No file found."
    exit 1
fi

tab=$'\t'
sfvfile="$1"
exit_status=0

cd "$(dirname "$sfvfile")"

sfv_values=$(cat "$(basename "$sfvfile")"| grep -v '^\s*;')

ORIGIFS=$IFS

IFS=`echo -en "\n\b"`

for line in $sfv_values; do
    IFS=$ORIGIFS

    crc=`echo $line | $sed -e 's/.*[[:space:]]+([0-9A-Fa-f]{8})[[:space:]]*$/\\1/' | tr A-Z a-z | $sed -e 's/^0+//'`
    file=`echo $line | $sed -e 's/(.*)[[:space:]]+[0-9A-Fa-f]{8}[[:space:]]*$/\\1/'`
    if [ ! -f "$file" ]; then
	echo "MISSING$tab$file"
	exit_status=5
    else
	actual=`cksum -o 3 "$file" | cut -f 1 -d' ' | $sed -e 's:^:obase=16;:' | bc | tr A-Z a-z | $sed -e 's/^0+//'`
	if [ "$crc" !=  "$actual" ]; then
	    echo "BAD$tab$file"
	    exit_status=5
	fi
    fi
done

exit $exit_status