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Ian Skinner 2023-08-20 02:25:12 -04:00 committed by GitHub
parent c22e4ccdca
commit 2565dbd7c9
1 changed files with 33 additions and 7 deletions
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40
extract-gigaleak-csu.sh
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@ -1,6 +1,4 @@
# extract-gigaleak-csu # extract-gigaleak-csu
# Lillian Skinner
# Last modified 2023/08/19
# Extracts firmware CIAs from the RomFS of "SystemUpdater-0_13-0927-UnFixedKey.csu". This can't be done with other tools as 0.13.0 doesn't use the normal RomFS format. # Extracts firmware CIAs from the RomFS of "SystemUpdater-0_13-0927-UnFixedKey.csu". This can't be done with other tools as 0.13.0 doesn't use the normal RomFS format.
echo "Finding CIA headers in file..." echo "Finding CIA headers in file..."
@ -23,7 +21,6 @@ do
echo "Finding CIA $i end from CIA $((i + 1)) header... " echo "Finding CIA $i end from CIA $((i + 1)) header... "
y="00" y="00"
x=0 x=0
z="00"
while [ "$y" = "00" ]; do while [ "$y" = "00" ]; do
x+=1 x+=1
y=$(od -j $((NEXT_HEADER - x)) -N 1 -x -A n romfs.bin | sed 's|[ ,]||g' | sed 's/^..//'); y=$(od -j $((NEXT_HEADER - x)) -N 1 -x -A n romfs.bin | sed 's|[ ,]||g' | sed 's/^..//');
@ -35,7 +32,7 @@ do
echo "End found!" echo "End found!"
echo "Non-zerobyte ($y) at $((NEXT_HEADER - x))" echo "Non-zerobyte ($y) at $((NEXT_HEADER - x))"
echo "Padding from CIA $i to $((i + 1)) is $((x - 1)) bytes." echo "Padding from CIA $i to $((i + 1)) is $((x - 1)) bytes."
echo " Extract CIA:" echo " Extract CIA"
CIA_LENGTH=$(((NEXT_HEADER - START_HEADER) - x + 1)) CIA_LENGTH=$(((NEXT_HEADER - START_HEADER) - x + 1))
dd skip=${START_HEADER} count=${CIA_LENGTH} if=romfs.bin of="$i.cia" bs=1 dd skip=${START_HEADER} count=${CIA_LENGTH} if=romfs.bin of="$i.cia" bs=1
echo "CIA $i saved as '$i.cia'" echo "CIA $i saved as '$i.cia'"
@ -43,6 +40,7 @@ do
i+=2 i+=2
done < romfs-dir.txt done < romfs-dir.txt
i=2
echo "Extracting even CIAs..." echo "Extracting even CIAs..."
echo "=================================================" echo "================================================="
sed 1d romfs-dir.txt | while IFS=, read -r START_HEADER; read NEXT_HEADER sed 1d romfs-dir.txt | while IFS=, read -r START_HEADER; read NEXT_HEADER
@ -53,7 +51,6 @@ do
echo "Finding CIA $i end from CIA $((i + 1)) header... " echo "Finding CIA $i end from CIA $((i + 1)) header... "
y="00" y="00"
x=0 x=0
z="00"
while [ "$y" = "00" ]; do while [ "$y" = "00" ]; do
x+=1 x+=1
y=$(od -j $((NEXT_HEADER - x)) -N 1 -x -A n romfs.bin | sed 's|[ ,]||g' | sed 's/^..//'); y=$(od -j $((NEXT_HEADER - x)) -N 1 -x -A n romfs.bin | sed 's|[ ,]||g' | sed 's/^..//');
@ -65,12 +62,41 @@ do
echo "End found!" echo "End found!"
echo "Non-zerobyte ($y) at $((NEXT_HEADER - x))" echo "Non-zerobyte ($y) at $((NEXT_HEADER - x))"
echo "Padding from CIA $i to $((i + 1)) is $((x - 1)) bytes." echo "Padding from CIA $i to $((i + 1)) is $((x - 1)) bytes."
echo " Extract CIA:" echo " Extract CIA"
CIA_LENGTH=$(((NEXT_HEADER - START_HEADER) - x + 1)) CIA_LENGTH=$(((NEXT_HEADER - START_HEADER) - x + 1))
CIA_NUMBER+=1
dd skip=${START_HEADER} count=${CIA_LENGTH} if=romfs.bin of="$i.cia" bs=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." echo "CIA $i output as '$i.cia', ${CIA_LENGTH} bytes."
CIA_LENGTH="" CIA_LENGTH=""
echo "=================================================" echo "================================================="
i+=2 i+=2
done done
i=$((i - 1))
START_HEADER=$( tail -n 1 romfs-dir.txt )
NEXT_HEADER=$(xxd romfs.bin | grep "226e 6f6e 6522" | sed 's/: .*//' | sed 's/^0*//');
# 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 "Contents.cnt end at ${NEXT_HEADER}"
echo "Finding end of CIA $i from Contents.cnt end..."
y="00"
x=16
# Start x as 16 to skip changing data and go right to padding
while [ "$y" = "00" ]; do
x+=1
y=$(od -j $((NEXT_HEADER - x)) -N 1 -x -A n romfs.bin | sed 's|[ ,]||g' | sed 's/^..//');
# Get bytes one backwards from next header
# printf '%x\n' $((NEXT_HEADER - x))
# echo $y
# echo $x
done
echo "End found!"
echo "Non-zerobyte ($y) at $((NEXT_HEADER - x))"
echo "Padding from CIA $i to Content.cnt end is $((x - 1)) bytes."
echo " Extract CIA"
CIA_LENGTH=$(((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."
echo "================================================="
echo "All CIAs extracted from RomFS!"