/// <summary>
/// Initializes a new instance of the <see cref="MemoryControlBlock"/> class.
/// </summary>
/// <param name="memory">Emulated memory associated with the block.</param>
/// <param name="segment">Segment of the memory control block to read.</param>
public MemoryControlBlock(PhysicalMemory memory, ushort segment)
{
this.Segment = segment;
this.IsLast = memory.GetByte(segment, 0) == 0x5A;
this.PspSegment = memory.GetUInt16(segment, 1);
this.Length = memory.GetUInt16(segment, 3);
this.ImageName = memory.GetString(segment, 8, 8, 0);
}
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 ConvToEms(PhysicalMemory memory, uint sourceAddress, EmsHandle destHandle, int destPage, int destPageOffset, int length)
{
if (length < 0)
{
throw new ArgumentOutOfRangeException(nameof(length));
}
if (length == 0)
{
return(0);
}
if (sourceAddress + length > PhysicalMemory.ConvMemorySize)
{
return(0xA2);
}
if (destPageOffset >= ExpandedMemoryManager.PageSize)
{
return(0x95);
}
int offset = destPageOffset;
uint sourceCount = sourceAddress;
int pageIndex = destPage;
while (length > 0)
{
int size = Math.Min(length, ExpandedMemoryManager.PageSize - offset);
byte[] target = destHandle.GetLogicalPage(pageIndex);
if (target == null)
{
return(0x8A);
}
for (int i = 0; i < size; i++)
{
target[offset + i] = memory.GetByte(sourceCount++);
}
length -= size;
pageIndex++;
offset = 0;
}
return(0);
}
