decoder made fast
985439724ebb262321d07d2a84f04ae0da7a1679
1 files changed
build.sh
diff --git a/build.sh b/build.sh
index 517eca9..995d7b5 100755
--- a/build.sh
+++ b/build.sh
@@ -65,23 +65,20 @@ if [ "$#" -gt 0 ]; then
fi
TOTAL=$(stat -c %s $INPUT)
TOTALSECTORS=$(($TOTAL / $SECTORSIZE))
- echo "(experimental) Decoding $INPUT to directory $DIR processing $TOTALSECTORS sectors"
- i=1
- while [ $i -lt $TOTALSECTORS ]
- do
- echo -e -n "$i\r"
- PROBE=$(dd if=$INPUT count=1 skip=$i 2>/dev/null | hexdump -n 4 -e '/1 "%02x"')
- if [[ "$PROBE" == "1f8b0800" ]]; then
- echo "initrd.gz found at sector $i"
- dd if=$INPUT count=$(($i - 1)) skip=1 2>/dev/null > $DIR/kernel
- dd if=$INPUT count=$(($TOTALSECTORS - $i)) skip=$i 2>/dev/null > $DIR/initrd.gz
- echo "ready"
- echo
- exit 0
- fi
- i=$(( $i + 1 ))
- done
- echo "No initrd.gz found"
+ echo "Decoding $INPUT to directory $DIR processing..."
+ HEXADDRESS=$(hexdump $INPUT | grep '8b1f 0008 0000' | sed 's/ .*//' | tr '[a-z]' '[A-Z]')
+ if [[ $HEXADDRESS == "" ]]; then
+ echo "No initrd.gz found"
+ exit 1
+ fi
+ echo
+ ADDRESS=$(echo "obase=10; ibase=16; $HEXADDRESS" | bc)
+ SECTOR=$(($ADDRESS / SECTORSIZE))
+ echo "writing: $DIR/kernel"
+ dd if=$INPUT count=$(($SECTOR - 1)) skip=1 2>/dev/null > $DIR/kernel
+ echo "writing: $DIR/initrd.gz"
+ dd if=$INPUT count=$(($TOTALSECTORS - $SECTOR)) skip=$SECTOR 2>/dev/null > $DIR/initrd.gz
+ echo
exit 0
fi