private void ReadBlock(Stream stream, AseColorGroupCollection groups, Stack <AseColorEntryCollection> colorStack)
{
AseBlockType blockType;
int blockLength;
int offset;
int dataLength;
_BlockData block = null;
blockType = (AseBlockType)stream.ReadUInt16BigEndian();
blockLength = stream.ReadUInt32BigEndian();
// store the current position of the stream, so we can calculate the offset
// from bytes read to the block length in order to skip the bits we didn't
// read, support or know what they are
offset = (int)stream.Position;
// process the actual block
switch (blockType)
{
case AseBlockType.Color:
block = this.ReadColorBlock(stream, colorStack);
break;
case AseBlockType.GroupStart:
block = this.ReadGroupBlock(stream, groups, colorStack);
break;
case AseBlockType.GroupEnd:
block = null;
colorStack.Pop();
break;
default:
throw new InvalidDataException(string.Format("Unsupported block type '{0}'.", blockType));
}
// load in any custom data and attach it to the
// current block (if available) as raw byte data
dataLength = blockLength - (int)(stream.Position - offset);
if (dataLength > 0)
{
byte[] extraData;
extraData = new byte[dataLength];
stream.Read(extraData, 0, dataLength);
if (block != null)
{
block.ExtraData = extraData;
}
}
}
/*--- Method: private -----------------------------------------------------------------------------------------------------------------------------------------*/
private int GetBlockLength(_BlockData block)
{
int blockLength;
// name data (2 bytes per character + null terminator, plus 2 bytes to describe that first number )
blockLength = 2 + (((block.Name ?? string.Empty).Length + 1) * 2);
if (block.ExtraData != null)
{
blockLength += block.ExtraData.Length; // data we can't process but keep anyway
}
return(blockLength);
}
