public static ZProperty NextProperty(this MemoryReader reader, int version, ZPropertyTable propertyTable, int index)
{
var sizeByte = reader.NextByte();
if (sizeByte == 0)
{
return(null);
}
if (version >= 1 && version <= 3)
{
return(reader.NextProperty_V1(sizeByte, propertyTable, index));
}
else if (version >= 4 && version <= 8)
{
return(reader.NextProperty_V4(sizeByte, propertyTable, index));
}
else
{
throw new InvalidOperationException("Invalid version number: " + version);
}
}
private static ZProperty NextProperty_V1(this MemoryReader reader, byte sizeByte, ZPropertyTable propertyTable, int index)
{
var address = reader.Address - 1;
var number = sizeByte % 32;
var length = (sizeByte / 32) + 1;
var dataAddress = reader.Address;
reader.Skip(length);
return(new ZProperty(reader.Memory, propertyTable, index, address, number, dataAddress, length));
}
private static ZProperty NextProperty_V4(this MemoryReader reader, byte sizeByte, ZPropertyTable propertyTable, int index)
{
var address = reader.Address - 1;
var number = sizeByte & 0x3f; // number is in the bottom 6 bites
int length;
if ((sizeByte & 0x80) == 0x80) // if bit 7 is set
{
var nextByte = reader.NextByte() & 0x3f;
length = nextByte == 0 ? 64 : nextByte;
}
else if ((sizeByte & 0x40) == 0x40) // if bit 6 is set
{
length = 2;
}
else
{
length = 1;
}
var dataAddress = reader.Address;
reader.Skip(length);
return(new ZProperty(reader.Memory, propertyTable, index, address, number, dataAddress, length));
}
