/// <summary>
/// Reads all the messages from the message byte code.
/// </summary>
/// <param name="messageData">Message byte code.</param>
/// <param name="encodedMessages">True if messages are encoded.</param>
/// <returns>Collection of messages.</returns>
private static List <string> DecompileMessages(byte[] messageData, bool encodedMessages)
{
var messages = new List <string>();
int messagesOffset = 0;
////////////////
// Messages header
// [0] = Number of messages
int numMessages = messageData[messagesOffset];
messagesOffset += 1;
// [1][2] = Offset of end of messages
messagesOffset += 2;
// [3+] = Offset of each message (as per number of messages)
// [x+] = Message data
int messageDataOffset = messagesOffset + (numMessages * 2);
if (numMessages > 0)
{
if (encodedMessages)
{
// decrypt the data in-place, this modifies the buffer passed as input
var xform = new XorTransform(Key);
xform.TransformBlock(messageData, messageDataOffset, messageData.Length - messageDataOffset, messageData, messageDataOffset);
}
// Go back to array of offset of each message
for (int i = 0; i < numMessages; i++)
{
// [0][1] = Offset of message
int messageOffset = (messageData[messagesOffset + 1] * 0x100) + messageData[messagesOffset];
messagesOffset += 2;
string msg;
if ((messageOffset - 2) >= 0)
{
msg = StringDecoder.GetNullTerminatedString(messageData, messageOffset + 1);
}
else
{
msg = string.Empty;
}
messages.Add(msg);
}
}
return(messages);
}
/// <summary>
/// Decode the inventory resource from byte array.
/// </summary>
/// <param name="data">Source array (data should NOT be encrypted).</param>
/// <param name="padded">Inventory data is padded.</param>
/// <returns>Inventory resource.</returns>
private static InventoryResource ReadInventory(byte[] data, bool padded)
{
int offset = 0;
// [0][1] = Offset of the start of inventory item names
int namesOffset = (data[offset + 1] * 0x100) + data[offset];
offset += 2;
// [2] = Maximum number of animated objects (not sure what this is for)
byte maxAnimatedObjects = data[offset];
offset += 1;
if (padded)
{
offset++;
}
var items = new List <InventoryItem>();
// [3+] = three byte entry for each inventory item all of which conform to the following format
while (offset <= namesOffset)
{
// [0][1] = Offset of inventory item name i
int nameOffset = (data[offset + 1] * 0x100) + data[offset];
offset += 2;
// [2] = Starting room number for inventory item i or 255 carried
byte room = data[offset];
offset += 1;
if (padded)
{
offset++;
}
// [offset + 3]
string name = StringDecoder.GetNullTerminatedString(data, nameOffset + (padded ? 4 : 3));
items.Add(new InventoryItem(name, room));
}
return(new InventoryResource(items.ToArray(), maxAnimatedObjects));
}
/// <summary>
/// Decode the view resource from byte array.
/// </summary>
/// <param name="resourceIndex">Resource index.</param>
/// <param name="viewData">View data.</param>
/// <returns>View resource.</returns>
public static ViewResource ReadView(byte resourceIndex, byte[] viewData)
{
var mapLoopHeaderPosToLoopNum = new Dictionary <int, int>();
// View header
int viewOffset = 0;
// [0] = unknown
byte unknown1 = viewData[viewOffset];
viewOffset += 1;
// [1] = unknown
byte unknown2 = viewData[viewOffset];
viewOffset += 1;
// [2] = number of loops
int numLoops = viewData[viewOffset];
viewOffset += 1;
// [3][4] = position of description
int descPos = (viewData[viewOffset + 1] * 0x100) + viewData[viewOffset];
viewOffset += 2;
string description = string.Empty;
if (descPos > 0)
{
description = StringDecoder.GetNullTerminatedString(viewData, descPos);
}
var loops = new ViewLoop[numLoops];
for (int loop = 0; loop < numLoops; loop++)
{
var cels = new ViewCel[0];
int mirrorOfIndex = -1;
// [0][1] = position of loop header
int loopHeaderPos = (viewData[viewOffset + 1] * 0x100) + viewData[viewOffset];
viewOffset += 2;
if (mapLoopHeaderPosToLoopNum.ContainsKey(loopHeaderPos))
{
// We have already seen this loop, looks like this is a mirror
mirrorOfIndex = mapLoopHeaderPosToLoopNum[loopHeaderPos];
}
else
{
mapLoopHeaderPosToLoopNum.Add(loopHeaderPos, loop);
// Loop header
int loopOffset = loopHeaderPos;
// [0] = number of cels in loop
int numCels = viewData[loopOffset];
loopOffset += 1;
cels = new ViewCel[numCels];
for (int cel = 0; cel < numCels; cel++)
{
// [0][1] = position of first cel header, relative to start of loop
int celHeaderPos = (viewData[loopOffset + 1] * 0x100) + viewData[loopOffset];
loopOffset += 2;
// Cel header
int celOffset = loopHeaderPos + celHeaderPos;
// [0] = width of cel in pixels (1 agi pixels = 2 ega pixels)
byte celWidth = viewData[celOffset];
celOffset += 1;
// [1] = height of cel
byte celHeight = viewData[celOffset];
celOffset += 1;
// [2] = transparency and cel mirroring
// (high 4 bits are mirror info, low 4 bits are transparent color)
byte transparentColor = (byte)(viewData[celOffset] & 0x0f);
byte mirrorInfo = (byte)((viewData[celOffset] & 0xf0) >> 4);
bool mirror = (mirrorInfo & 0x08) != 0;
byte mirrorLoopNumber = (byte)(mirrorInfo & 0x07);
celOffset += 1;
// [+] = RLE encoding of pixels
byte[] pixels = RleCompression.Decompress(viewData, celOffset, celWidth, celHeight, transparentColor);
cels[cel] = new ViewCel(celWidth, celHeight, transparentColor, mirror, mirrorLoopNumber, pixels);
}
}
loops[loop] = new ViewLoop(cels, mirrorOfIndex);
}
// Go through all the loops and process the ones that are marked as mirrors
for (int loop = 0; loop < loops.Length; loop++)
{
if (loops[loop].IsMirror)
{
// Create the mirrored cels for this loop
var originalLoop = loops[loops[loop].MirrorOfIndex];
var cels = new ViewCel[originalLoop.Cels.Length];
for (int cel = 0; cel < cels.Length; cel++)
{
ViewCel originalCel = originalLoop.Cels[cel];
cels[cel] = new ViewCel(originalCel.Width, originalCel.Height, originalCel.TransparentColor, originalCel.Mirror, originalCel.MirrorLoopNumber, originalCel.MirrorPixels());
}
loops[loop] = new ViewLoop(cels, -1);
}
}
return(new ViewResource(resourceIndex, loops, description, unknown1, unknown2));
}