Sprites in .obj files are composed of Y null-separated records with a probable type field

scripts/try-uncompress

@@ -202,17 +202,17 @@ def display(data, blocksize=8, skip=0, header: false)
   nrows = (bytes.count / blocksize)
 
   0.upto(nrows) do |i|
-    header!(blocksize) if i%16==0 || i == skip
+    header!(blocksize) if header && (i%16==0 || i == skip)
     block = bytes[(i*blocksize)...(i*blocksize+blocksize)]
 
     block.concat([nil]*(blocksize-block.size)) if block.size < blocksize
 
     out = [
-      "0x#{hex(i*blocksize, 4)}",
+#      "0x#{hex(i*blocksize, 4)}",
       block.map { |b| hex(b, 2) },                          # hex
-      "    | " + block.map { |b| text(b) }.join("") + " |",   # ascii
-      block.map { |b| ascii(b) } ,# decimal bytes
-      "",# decimal 2-bytes
+#      "    | " + block.map { |b| text(b) }.join("") + " |",   # ascii
+#      block.map { |b| ascii(b) } ,# decimal bytes
+#      "",# decimal 2-bytes
       # decimal 4-bytes
     ]
 
@@ -266,7 +266,6 @@ def decompress(filename)
     loop do
       break if data.empty?
 
-      type = data.shift(1)[0]
       right = data.index(0)
       
 
@@ -278,12 +277,18 @@ def decompress(filename)
       rec = data.shift(right)
       _ = data.shift(1) # drop the record separator
 
-      decompressed << [ type, rec[0] ]
+      decompressed << rec
     end
+    puts ": #{decompressed.size} records. Sprite pixels: #{hdr.width*hdr.height}"
 
-    puts ": #{data.size} bytes remaining. Decompressed: #{decompressed.size} bytes. Sprite pixels: #{hdr.width*hdr.height}"
-    pp decompressed
-#    display(decompressed.map(&:chr).join(""))
+    puts "WARNING: #{data.size} bytes left over" if data.size > 0
+
+    header!
+    decompressed.each_with_index do |line, y|
+      x = line.size
+      padding = (sprite.header.width - x) / 2
+      display((["\x00"]*padding + line.map(&:chr)).join(""), line.size+padding.size)
+    end
   end
 end