experimental disk decoding ... (slow)
0cd510990e9c440912e6117811a25935e7a466dd
1 files changed
build.sh
diff --git a/build.sh b/build.sh
index 8f33ade..232aa6f 100755
--- a/build.sh
+++ b/build.sh
@@ -1,6 +1,6 @@
#!/bin/sh
#
-ME="Bootsector Linux loader 1.1 (C) 2023 By Alphons van der Heijden"
+ME="Bootsector Linux loader 1.2 (C) 2023 By Alphons van der Heijden"
#
# Making bootable disk file and an additional .vmdk file for booting in vmware
#
@@ -10,6 +10,7 @@ ME="Bootsector Linux loader 1.1 (C) 2023 By Alphons van der Heijden"
# HEADS=128, SECTORS=32 ; disksize > 1GB && disksize < 2GB
# HEADS=255, SECTORS=63 ; disksize > 2GB
#
+# Experimental disk decoding (to kernel and initrd.gz)
# 2014- Dr Gareth Owen (www.ghowen.me). All rights reserved.
#
@@ -42,8 +43,45 @@ echo
BOOT="bsect.asm"
TMPINITRD=/tmp/initrd.gz
SECTORSIZE=512
-HEADS=64
-SECTORS=32
+
+if [ "$#" -gt 0 ]; then
+ if [ "$#" != 2 ]; then
+ echo "Usage: $0 <disk> <outputdirectory>"
+ echo
+ exit 1
+ fi
+ INPUT=$1
+ DIR=$2
+ if [ ! -d $DIR ]; then
+ echo "Directory does not exist"
+ exit 1
+ fi
+ if [ ! -f $INPUT ]; then
+ echo "Input file $INPUT not found"
+ echo
+ exit 1
+ fi
+ TOTAL=$(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"
+ exit 0
+fi
# preprocessing INITRD for multiple entries
echo -n > $TMPINITRD