private static void SplitTestAssert(int sizeIndex, int userSize, int newUserSize)
{
PersistentHeapFreeSpace freeSpace = new PersistentHeapFreeSpace(sizeIndex, sizeIndex + userSize + PersistentHeapSpace.GetUserSizeSize() - 1, 29);
PersistentHeapUsedSpace usedSpace = freeSpace.Split(newUserSize);
Assert.AreEqual(newUserSize, freeSpace.UserSize);
Assert.AreEqual(sizeIndex, freeSpace.SizeIndex);
Assert.AreEqual(sizeIndex + newUserSize + PersistentHeapSpace.GetUserSizeSize() - 1, freeSpace.EndIndex);
Assert.AreEqual(userSize - newUserSize - PersistentHeapSpace.GetUserSizeSize(), usedSpace.UserSize);
Assert.AreEqual(sizeIndex + newUserSize + PersistentHeapSpace.GetUserSizeSize() - 1 + 1, usedSpace.SizeIndex);
}
public int Allocate(int allocationSize)
{
AssertUserSize(allocationSize);
PersistentHeapFreeSpace freeSpot = GetFreeSpaceThatIsAtLeast(allocationSize);
PersistentHeapUsedSpace usedSpot;
if (freeSpot.UserSize > allocationSize)
{
usedSpot = freeSpot.Split(allocationSize);
PutFullSpace(freeSpot);
}
else //the freeSpot is the perfect size
{
Debug.Assert(freeSpot.UserSize == allocationSize);
usedSpot = ToUsedSpace(freeSpot);
}
PutFullSpace(usedSpot);
Debug.Assert(usedSpot.UserSize == allocationSize);
return(usedSpot.StartIndex);
}
