resources/region_files: add a zlib compressed chunk

resources/region_files/first_chunk.sh

@@ -5,9 +5,18 @@ else
     VERBOSE=false
 fi
 
+if [ "$1" = "-n" ]; then
+    DECOMPRESS=false
+    shift
+else
+    DECOMPRESS=true
+fi
+
+
 if [ ! -f "$1" ]; then
-    echo "Usage: $0 [-v] FILE"
+    echo "Usage: $0 [-v] [-n] FILE"
     echo "  -v   display raw content and NBT dump"
+    echo "  -n   don't decompress"
     exit 1
 fi
 
@@ -62,13 +71,20 @@ sys.stdout.buffer.flush()
 esac
 echo "  format: $FORMAT ($FORMAT_HEX)"
 
+
+if $DECOMPRESS; then
+  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
+else
+  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
+fi
+
 if $VERBOSE; then
     echo "Raw chunk data:"
     echo "$DATA"
     echo "NBT dump:"
 
     #TODO: use pipes instead of a file
-    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
+    #TODO: fix this up to work with both compressed and uncompressed NBT
     dumpnbt /tmp/chunk_uncompressed_nbt
     rm /tmp/chunk_uncompressed_nbt
 fi