Esempio n. 1
0
        private static IList <RasterLayerChunk> CountRasterChunks(BufferedBinaryReader reader, int layerCount, ushort majorVersion)
        {
            List <RasterLayerChunk> rasterChunks = new List <RasterLayerChunk>(layerCount);

            int index = 0;

            while (index < layerCount)
            {
                uint head = reader.ReadUInt32();
                if (head != PSPConstants.blockIdentifier)
                {
                    throw new FormatException(Properties.Resources.InvalidBlockSignature);
                }
                PSPBlockID blockID = (PSPBlockID)reader.ReadUInt16();
#pragma warning disable IDE0059 // Value assigned to symbol is never used
                uint initialBlockLength = majorVersion <= PSPConstants.majorVersion5 ? reader.ReadUInt32() : 0;
#pragma warning restore IDE0059 // Value assigned to symbol is never used
                uint blockLength = reader.ReadUInt32();

                if (blockID == PSPBlockID.Layer)
                {
                    index++;
                    long endOffset = reader.Position + blockLength;

                    LayerInfoChunk chunk         = new LayerInfoChunk(reader, majorVersion);
                    long           currentOffset = reader.Position;

                    switch (chunk.type)
                    {
                    case PSPLayerType.Raster:
                    case PSPLayerType.FloatingRasterSelection:
                        if (majorVersion >= PSPConstants.majorVersion12)
                        {
                            // Paint Shop Pro X2 and later insert an unknown block (0x21) before the start of the LayerBitmapInfo chunk.
                            bool ok = false;
                            if (reader.ReadUInt32() == PSPConstants.blockIdentifier)
                            {
                                ushort block  = reader.ReadUInt16();
                                uint   length = reader.ReadUInt32();

                                if (block == 0x21)
                                {
                                    reader.Position += length;
                                    if (reader.ReadUInt32() == LayerBitmapInfoChunk.HeaderSize)
                                    {
                                        reader.Position -= 4L;
                                        currentOffset    = reader.Position;
                                        ok = true;
                                    }
                                }
                            }

                            if (!ok)
                            {
                                throw new FormatException(Properties.Resources.UnsupportedFormatVersion);
                            }
                        }

                        rasterChunks.Add(new RasterLayerChunk(chunk, currentOffset));
                        break;
                    }

                    reader.Position += (endOffset - currentOffset);
                }
                else
                {
                    reader.Position += blockLength;
                }
            }

            return(rasterChunks);
        }
Esempio n. 2
0
 public RasterLayerChunk(LayerInfoChunk info, long offset)
 {
     this.layerInfo        = info;
     this.bitmapInfoOffset = offset;
 }