91 lines
2.3 KiB
Bash
91 lines
2.3 KiB
Bash
if [ "$1" = "-v" ]; then
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VERBOSE=true
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shift
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else
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VERBOSE=false
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fi
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if [ "$1" = "-n" ]; then
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DECOMPRESS=false
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shift
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else
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DECOMPRESS=true
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fi
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if [ ! -f "$1" ]; then
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echo "Usage: $0 [-v] [-n] FILE"
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echo " -v display raw content and NBT dump"
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echo " -n don't decompress"
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exit 1
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fi
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# pointer data
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OFFSET_HEX="0x$(dd bs=1 if="$1" count=3 2>/dev/null | hexdump -e '3/1 "%02x" "\n"')"
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OFFSET="$(baseconvert -d $OFFSET_HEX)"
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echo " offset: $OFFSET ($OFFSET_HEX)"
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LENGTH_HEX="0x$(dd bs=1 if="$1" count=1 skip=3 2>/dev/null | hexdump -e '1/1 "%02x" "\n"')"
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LENGTH="$(baseconvert -d $LENGTH_HEX)"
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echo " length: $LENGTH ($LENGTH_HEX)"
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#TODO: last modified
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# chunk
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DATA="$(dd if="$1" bs=4096 count=$LENGTH skip=$OFFSET 2>/dev/null | hexdump -v -e '16/1 "%02x" "\n"' | tr -d '
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')"
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# blob header
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# bs=2 because each byte is two digits hex
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COMPRESSED_LENGTH_HEX="0x$(dd bs=2 count=4 2> /dev/null <<< $DATA)"
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COMPRESSED_LENGTH="$(baseconvert -d $COMPRESSED_LENGTH_HEX)"
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echo " compressed length in bytes: $COMPRESSED_LENGTH ($COMPRESSED_LENGTH_HEX)"
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FORMAT_HEX="0x$(dd bs=2 skip=4 count=1 2> /dev/null <<< $DATA)"
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case $FORMAT_HEX in
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"0x01")
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FORMAT="gzip"
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function UNCOMPRESS {
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gzip -dc
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}
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;;
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"0x02")
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FORMAT="zlib"
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function UNCOMPRESS {
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cat > /tmp/chunk_zlib_decompress
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python3 <<< "
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import zlib,sys
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a = open('/tmp/chunk_zlib_decompress', 'rb')
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data = a.read()
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a.close()
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sys.stdout.buffer.write(zlib.decompress(data))
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sys.stdout.buffer.flush()
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"
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rm /tmp/chunk_zlib_decompress
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}
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;;
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*)
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FORMAT="unknown"
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function UNCOMPRESS {
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false
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}
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;;
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esac
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echo " format: $FORMAT ($FORMAT_HEX)"
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if $DECOMPRESS; then
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dd if="$1" bs=4096 count=$LENGTH skip=$OFFSET 2>/dev/null | dd bs=1 skip=5 count=$(($COMPRESSED_LENGTH-1)) 2>/dev/null | UNCOMPRESS > /tmp/chunk_uncompressed_nbt
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else
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dd if="$1" bs=4096 count=$LENGTH skip=$OFFSET 2>/dev/null | dd bs=1 skip=5 count=$(($COMPRESSED_LENGTH-1)) 2>/dev/null > /tmp/chunk_compressed_nbt
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fi
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if $VERBOSE; then
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echo "Raw chunk data:"
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echo "$DATA"
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echo "NBT dump:"
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#TODO: use pipes instead of a file
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#TODO: fix this up to work with both compressed and uncompressed NBT
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dumpnbt /tmp/chunk_uncompressed_nbt
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rm /tmp/chunk_uncompressed_nbt
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fi
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