/// <summary>
/// Writes to a header extension table entry.
/// </summary>
/// <param name="entry">
/// The header extension table entry.
/// </param>
/// <param name="value">
/// The value to write.
/// </param>
protected void WriteHeaderExtensionTableEntry(HeaderExtension entry, ushort value)
{
var extensionTableAddress = this.HeaderExtensionTableAddress;
if (extensionTableAddress > 0)
{
var entryCount = this.Memory.ReadWord(extensionTableAddress);
var entryNumber = (ushort)entry;
if (entryNumber <= entryCount)
{
this.Memory.WriteWord(extensionTableAddress + (entryNumber * 2), value);
}
}
}
/// <summary>
/// Reads from a header extension table entry.
/// </summary>
/// <param name="entry">
/// The header extension table entry.
/// </param>
/// <returns>
/// The value read.
/// </returns>
protected ushort ReadHeaderExtensionTableEntry(HeaderExtension entry)
{
// todo: Is this needed in V6 or make this private?
var extensionTableAddress = this.HeaderExtensionTableAddress;
if (extensionTableAddress > 0)
{
var entryCount = this.Memory.ReadWord(extensionTableAddress);
var entryNumber = (ushort)entry;
if (entryNumber <= entryCount)
{
return this.Memory.ReadWord(extensionTableAddress + (entryNumber * 2));
}
}
return 0;
}