public void Load(Stream stream)
{
Stack <ColorEntryCollection> colors;
ColorGroupCollection groups;
ColorEntryCollection globalColors;
groups = new ColorGroupCollection();
globalColors = new ColorEntryCollection();
colors = new Stack <ColorEntryCollection>();
// add the global collection to the bottom of the stack to handle color blocks outside of a group
colors.Push(globalColors);
int blockCount;
this.ReadAndValidateVersion(stream);
blockCount = stream.ReadUInt32BigEndian();
for (int i = 0; i < blockCount; i++)
{
this.ReadBlock(stream, groups, colors);
}
this.Groups = groups;
this.Colors = globalColors;
}
private void ReadBlock(Stream stream, ColorGroupCollection groups, Stack <ColorEntryCollection> colorStack)
{
BlockType blockType;
int blockLength;
int offset;
int dataLength;
Block block;
blockType = (BlockType)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 BlockType.Color:
block = this.ReadColorBlock(stream, colorStack);
break;
case BlockType.GroupStart:
block = this.ReadGroupBlock(stream, groups, colorStack);
break;
case BlockType.GroupEnd:
block = null;
colorStack.Pop();
break;
default:
throw new InvalidDataException($"Unsupported block type '{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;
}
}
}
private Block ReadGroupBlock(Stream stream, ColorGroupCollection groups, Stack <ColorEntryCollection> colorStack)
{
ColorGroup block;
string name;
// read the name of the group
name = stream.ReadStringBigEndian();
// create the group and add it to the results set
block = new ColorGroup {
Name = name
};
groups.Add(block);
// add the group color collection to the stack, so when subsequent color blocks
// are read, they will be added to the correct collection
colorStack.Push(block.Colors);
return(block);
}
