rvtr/extract-updater-rofs.sh
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Ian Skinner 2023-08-20 05:22:48 -04:00 committed by GitHub
parent a4eb0307a7
commit 83aadd766a
1 changed files with 8 additions and 8 deletions
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extract-updater-rofs.sh
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@ -1,5 +1,6 @@
# extract-updater-rofs
# Extracts firmware CIAs from ROFS containers for some gigaleak SystemUpdaters.
# Place in same directory as ROFS named "romfs.bin"
echo "Finding CIA headers in file..."
od -t x -A d romfs.bin | grep "00002020 00000000 00000a00 00000350" | sed 's/ .*//' | sed 's/^0*//' > romfs-dir.txt
@ -71,15 +72,14 @@ do
i+=2
done
i=$((i - 1))
START_HEADER=$( tail -n 1 romfs-dir.txt )
NEXT_HEADER=$(xxd romfs.bin | grep "226e 6f6e 6522" | sed 's/: .*//' | sed 's/^0*//');
NEXT_HEADER=$((16#$(xxd romfs.bin | grep "226e 6f6e 6522" | sed 's/: .*//' | sed 's/^0*//')));
# Find "226e 6f6e 6522" as it is the last predictable data to mark the end of Contents.cnt and the last CIA.
# Upsettingly I have to use xxd because od wouldn't turn up any results for this... I liked od's formatting more :despair:
echo " Check CIA length"
echo "CIA $i header at ${START_HEADER}"
echo "Final CIA header at ${START_HEADER}"
echo "Contents.cnt end at ${NEXT_HEADER}"
echo "Finding end of CIA $i from Contents.cnt end..."
echo "Finding end of final CIA from Contents.cnt end..."
y="00"
x=16
# Start x as 16 to skip changing data and go right to padding
@ -93,10 +93,10 @@ while [ "$y" = "00" ]; do
done
echo "End found!"
echo "Non-zerobyte ($y) at $((NEXT_HEADER - x))"
echo "Padding from CIA $i to Content.cnt end is $((x - 1)) bytes."
echo "Padding from final CIA to Content.cnt end is $((x - 1)) bytes."
echo " Extract CIA"
CIA_LENGTH=$(((NEXT_HEADER - START_HEADER) - x + 1))
dd skip=${START_HEADER} count=${CIA_LENGTH} if=romfs.bin of="$i.cia" bs=1
echo "CIA $i output as '$i.cia', ${CIA_LENGTH} bytes."
dd skip=${START_HEADER} count=${CIA_LENGTH} if=romfs.bin of="0.cia" bs=1
echo "Final CIA output as '0.cia', ${CIA_LENGTH} bytes."
echo "================================================="
echo "All CIAs extracted from RomFS!"