gistfile1.coffee

 parseRLE: ->
    Log.debug "Attempting to parse RLE encoded image..."

    # RLE stores the scan line byte counts in the first chunk of data
    byteCounts = []
    for i in [[email protected]]
      for j in [0...@height]
        byteCounts.push @file.readShortInt()

    Log.debug "Read byte counts. Current pos = #{@file.tell()}, Pixels = #{@length}"

    # And then it stores the compressed image data
    @channelData = []
    @channelData.push 0 for x in [0...@length]

    chanPos = 0
    lineIndex = 0

    for i in [[email protected]] # i = plane num
      console.log "Parsing channel ##{i}, Start = #{@file.tell()}"

      for j in [0...@height]
        byteCount = byteCounts[lineIndex++]
        start = @file.tell()

        while @file.tell() < start + byteCount
          [len] = @file.read(1)

          if len < 128
            len++
            data = @file.read len

            # memcpy!
            @channelData[chanPos...chanPos+len] = data
            chanPos += len
          else if len > 128
            len ^= 0xff
            len += 2

            [val] = @file.read(1)
            data = []
            data.push val for z in [0...len]

            @channelData[chanPos...chanPos+len] = data
            chanPos += len

    switch @header.mode
      when 3 # RGBColor
        @combineRGB8Channel() if @header.depth is 8
        @combineRGB16Channel() if @header.depth is 16