/// <summary>
/// Writes the values of the memory control block to emulated memory.
/// </summary>
/// <param name="memory">Emulated memory where block will be written.</param>
public void Write(PhysicalMemory memory)
{
memory.SetByte(this.Segment, 0, this.IsLast ? (byte)0x5A : (byte)0x4D);
memory.SetUInt16(this.Segment, 1, this.PspSegment);
memory.SetUInt16(this.Segment, 3, this.Length);
// These are just to clear the name area to make sure it is padded with nulls.
memory.SetUInt32(this.Segment, 8, 0);
memory.SetUInt32(this.Segment, 12, 0);
memory.SetString(this.Segment, 8, this.ImageName, false);
}
public static byte ConvToConv(PhysicalMemory memory, uint sourceAddress, uint destAddress, int length)
{
if (length < 0)
{
throw new ArgumentOutOfRangeException(nameof(length));
}
if (length == 0)
{
return(0);
}
if (sourceAddress + length > PhysicalMemory.ConvMemorySize || destAddress + length > PhysicalMemory.ConvMemorySize)
{
return(0xA2);
}
bool overlap = (sourceAddress + length - 1 >= destAddress || destAddress + length - 1 >= sourceAddress);
bool reverse = overlap && sourceAddress > destAddress;
if (!reverse)
{
for (uint offset = 0; offset < length; offset++)
{
memory.SetByte(destAddress + offset, memory.GetByte(sourceAddress + offset));
}
}
else
{
for (int offset = length - 1; offset >= 0; offset--)
{
memory.SetByte(destAddress + (uint)offset, memory.GetByte(sourceAddress + (uint)offset));
}
}
return(overlap ? (byte)0x92 : (byte)0);
}
public static byte EmsToConv(EmsHandle sourceHandle, int sourcePage, int sourcePageOffset, PhysicalMemory memory, uint destAddress, int length)
{
if (length < 0)
{
throw new ArgumentOutOfRangeException(nameof(length));
}
if (length == 0)
{
return(0);
}
if (destAddress + length > PhysicalMemory.ConvMemorySize)
{
return(0xA2);
}
if (sourcePageOffset >= ExpandedMemoryManager.PageSize)
{
return(0x95);
}
int offset = sourcePageOffset;
uint sourceCount = destAddress;
int pageIndex = sourcePage;
while (length > 0)
{
int size = Math.Min(length, ExpandedMemoryManager.PageSize - offset);
byte[] source = sourceHandle.GetLogicalPage(pageIndex);
if (source == null)
{
return(0x8A);
}
for (int i = 0; i < size; i++)
{
memory.SetByte(sourceCount++, source[offset + i]);
}
length -= size;
pageIndex++;
offset = 0;
}
return(0);
}
