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);
}
public RasterLayerChunk(LayerInfoChunk info, long offset)
{
this.layerInfo = info;
this.bitmapInfoOffset = offset;
}