internal static BMDMessage GetMessage(BinaryReader reader, int filePointer, BMDMessageTable msgTbl)
{
reader.BaseStream.Seek(filePointer + BMDFile.DATA_START_ADDRESS + msgTbl.Offset, SeekOrigin.Begin);
switch (msgTbl.Type)
{
case BMDMessageType.Standard:
return new BMDStandardMessage(reader, filePointer);
case BMDMessageType.Selection:
return new BMDSelectionMessage(reader, filePointer);
default:
throw new ArgumentException("Unknown message type: " + msgTbl.Type);
}
}
internal override void InternalWrite(BinaryWriter writer)
{
int posFileStart = (int)writer.BaseStream.Position;
List<int> addressList = new List<int>();
// Seek past chunk and msg header for writing later
writer.BaseStream.Seek(DATA_START_ADDRESS, SeekOrigin.Current);
// Write a dummy message pointer table
for (int i = 0; i < DialogCount; i++)
{
writer.Write(0);
addressList.Add((int)writer.BaseStream.Position - posFileStart);
writer.Write(0);
}
// Write a dummy offset for writing later
addressList.Add((int)writer.BaseStream.Position - posFileStart);
writer.Write(0);
writer.Write(ActorCount);
// These are always here for some reason
writer.Write(0);
writer.Write(0);
writer.AlignPosition(4);
BMDMessageTable[] messagePointerTable = new BMDMessageTable[DialogCount];
// Write the messages and fill in the message pointer table
for (int i = 0; i < DialogCount; i++)
{
writer.AlignPosition(4);
messagePointerTable[i].Offset = (int)writer.BaseStream.Position - DATA_START_ADDRESS - posFileStart;
_messages[i].InternalWrite(writer, ref addressList, posFileStart);
}
writer.AlignPosition(4);
int actorNamePointerTableOffset = (int)writer.BaseStream.Position - DATA_START_ADDRESS - posFileStart;
// Write dummy actor name pointer table if there are actors present
if (ActorCount > 0)
{
long actorNamePointerTablePosition = writer.BaseStream.Position;
for (int i = 0; i < ActorCount; i++)
{
addressList.Add((int)writer.BaseStream.Position - posFileStart);
writer.Write(0);
}
int[] actorNamePointerTable = new int[ActorCount];
for (int i = 0; i < actorNamePointerTable.Length; i++)
{
actorNamePointerTable[i] = (int)writer.BaseStream.Position - DATA_START_ADDRESS - posFileStart;
writer.WriteCString(_actorNames[i]);
}
long addresRelocPosition = writer.BaseStream.Position;
writer.BaseStream.Seek(actorNamePointerTablePosition, SeekOrigin.Begin);
writer.Write(actorNamePointerTable);
writer.BaseStream.Seek(addresRelocPosition, SeekOrigin.Begin);
}
// Compress and write the address relocationt able
byte[] addressRelocTable = PointerRelocationTableCompression.Compress(addressList, DATA_START_ADDRESS);
int addressRelocTableOffset = (int)writer.BaseStream.Position - posFileStart;
int addressRelocTableSize = addressRelocTable.Length;
writer.Write(addressRelocTable);
// Save the end offset for calculating length and seeking later
long posFileEnd = writer.BaseStream.Position;
int length = (int)(posFileEnd - posFileStart);
// Seek back to the start
writer.BaseStream.Seek(posFileStart, SeekOrigin.Begin);
// Write Chunk header
writer.Write(FLAG);
writer.Write((short)0); // userID
writer.Write(length);
writer.WriteCString(TAG, 4);
writer.Write(0);
// Write MSG header
writer.Write(addressRelocTableOffset);
writer.Write(addressRelocTableSize);
writer.Write(DialogCount);
writer.Write(UNK_CONSTANT);
for (int i = 0; i < DialogCount; i++)
{
writer.Write((int)messagePointerTable[i].Type);
writer.Write(messagePointerTable[i].Offset);
}
writer.Write(actorNamePointerTableOffset);
writer.BaseStream.Seek(posFileEnd, SeekOrigin.Begin);
}
private void InternalRead(BinaryReader reader)
{
long posFileStart = reader.GetPosition();
short flag = reader.ReadInt16();
short userID = reader.ReadInt16();
int length = reader.ReadInt32();
string tag = reader.ReadCString(4);
reader.AlignPosition(16);
if (tag != TAG)
{
throw new InvalidDataException();
}
int addressRelocTableOffset = reader.ReadInt32();
int addressRelocTableSize = reader.ReadInt32();
int numMessages = reader.ReadInt32();
short isRelocated = reader.ReadInt16(); // actually a byte but not very important
short unk0x1E = reader.ReadInt16();
/*
if (unk0x1C != UNK_CONSTANT)
{
Console.WriteLine("_unk0x1C isn't 0x20000");
}
*/
BMDMessageTable[] messagePointerTable = new BMDMessageTable[numMessages];
for (int i = 0; i < messagePointerTable.Length; i++)
{
messagePointerTable[i].Type = (BMDMessageType)reader.ReadInt32();
messagePointerTable[i].Offset = reader.ReadInt32();
}
int actorNamePointerTableOffset = reader.ReadInt32();
int numActors = reader.ReadInt32();
reader.BaseStream.Seek(posFileStart + DATA_START_ADDRESS + actorNamePointerTableOffset, SeekOrigin.Begin);
int[] actorNamePointerTable = reader.ReadInt32Array(numActors);
_actorNames = new string[numActors];
for (int i = 0; i < _actorNames.Length; i++)
{
reader.BaseStream.Seek(posFileStart + DATA_START_ADDRESS + actorNamePointerTable[i], SeekOrigin.Begin);
_actorNames[i] = reader.ReadCString();
}
_messages = new BMDMessage[numMessages];
for (int i = 0; i < _messages.Length; i++)
{
_messages[i] = BMDMessageFactory.GetMessage(reader, (int)posFileStart, messagePointerTable[i]);
}
}