public uint Allocate(uint size)
{
var page = new PageInfo();
while (size > Ram.FrameSize)
{
size -= Ram.FrameSize;
page.Append(Ram.Allocate(CurrentProcess));
}
page.Append(Ram.Allocate(CurrentProcess));
CurrentProcess.PageTable.Add(page);
return(page.Offset);
}
public Stream AllocateCodeBlock(ProcessContextBlock pcb, uint length)
{
var page = new PageInfo();
while (length > Ram.FrameSize)
{
length -= Ram.FrameSize;
page.Append(Ram.Allocate(pcb));
}
page.Append(Ram.Allocate(pcb));
pcb.Code = page;
return(GetMemoryStream(page));
}
public void Write()
{
var buffer = new byte[] {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 };
const uint frameSize = 4;
var ram = new Ram(buffer, frameSize);
var pageSet = new PageInfo();
var pcb = new ProcessContextBlock {Id = 1};
ram.Allocate(pcb);
pageSet.Append(ram.Allocate(pcb));
pageSet.Append(ram.Allocate(pcb));
var pageStream = new PageStream(ram, pageSet);
Assert.That(pageStream.Length, Is.EqualTo(8));
var b = new byte[] { 91, 92, 93, 94, };
pageStream.Position = 2;
pageStream.Write(b, 0, 4);
Assert.That(buffer, Is.EquivalentTo(new[] { 1, 2, 3, 4, 5, 6, 91, 92, 93, 94, 11, 12, }));
}
public void Read()
{
var buffer = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 };
const uint frameSize = 4;
var ram = new Ram(buffer, frameSize);
var pageSet = new PageInfo();
var pcb = new ProcessContextBlock {Id = 1};
ram.Allocate(pcb);
pageSet.Append(ram.Allocate(pcb));
pageSet.Append(ram.Allocate(pcb));
var pageStream = new PageStream(ram, pageSet);
Assert.That(pageStream.Length, Is.EqualTo(8));
var b = new byte[6];
pageStream.Read(b, 0, 6);
Assert.That(pageStream.Position, Is.EqualTo(6));
Assert.That(b, Is.EquivalentTo(new[] { 5, 6, 7, 8, 9, 10 }));
}
public Stream AllocateCodeBlock(ProcessContextBlock pcb, uint length)
{
var page = new PageInfo();
while ( length > Ram.FrameSize )
{
length -= Ram.FrameSize;
page.Append(Ram.Allocate(pcb));
}
page.Append(Ram.Allocate(pcb));
pcb.Code = page;
return GetMemoryStream(page);
}
public uint Allocate(uint size)
{
var page = new PageInfo();
while (size > Ram.FrameSize)
{
size -= Ram.FrameSize;
page.Append(Ram.Allocate(CurrentProcess));
}
page.Append(Ram.Allocate(CurrentProcess));
CurrentProcess.PageTable.Add(page);
return page.Offset;
}