public FileRegion ShrinkAndAlign(uint alignment)
{
long alignedStartOffset = Alignment.AlignUpPow2(Offset, alignment);
long alignedEndOffset = Alignment.AlignDownPow2(GetEndOffset(), alignment);
long alignedSize = alignedEndOffset - alignedStartOffset;
return(new FileRegion(alignedStartOffset, alignedSize));
}
public static nuint QueryWorkBufferSize(int orderMax)
{
Assert.SdkRequiresInRange(orderMax, 1, OrderUpperLimit);
var pageListSize = (nint)Unsafe.SizeOf <PageList>();
uint pageListAlignment = (uint)Unsafe.SizeOf <nint>();
const uint ulongAlignment = 8;
return((nuint)Alignment.AlignUpPow2(pageListSize * (orderMax + 1) + pageListAlignment, ulongAlignment));
}
// ReSharper disable once UnusedMember.Local
// We can't use an external buffer in C# without ensuring all allocated buffers are pinned.
// This function is left here anyway for completion's sake.
public static int QueryWorkBufferSize(int maxCacheCount)
{
Assert.SdkRequiresGreater(maxCacheCount, 0);
int entryAlignment = sizeof(CacheHandle);
int attrInfoAlignment = Unsafe.SizeOf <nuint>();
int entrySize = Unsafe.SizeOf <Entry>() * maxCacheCount;
int attrListSize = Unsafe.SizeOf <AttrInfo>() * 0x100;
return((int)Alignment.AlignUpPow2(
(ulong)(entrySize + attrListSize + entryAlignment + attrInfoAlignment), 8));
}
private int CalcStringTableSize(int startOffset, PartitionFileSystemType type)
{
int size = 0;
foreach (Entry entry in Entries)
{
size += entry.NameLength + 1;
}
int endOffset = Alignment.AlignUpPow2(startOffset + size, GetMetaDataAlignment(type));
return(endOffset - startOffset);
}
public Result Initialize(UIntPtr address, nuint size, nuint blockSize, int orderMax, void *workBuffer,
nuint workBufferSize)
{
Assert.True(workBufferSize >= QueryWorkBufferSize(orderMax));
uint pageListAlignment = (uint)Unsafe.SizeOf <nint>();
var alignedWork = (void *)Alignment.AlignUpPow2((ulong)workBuffer, pageListAlignment);
ExternalFreeLists = (PageList *)alignedWork;
// Note: The original code does not have a buffer size assert after adjusting for alignment.
Assert.True(workBufferSize - ((nuint)alignedWork - (nuint)workBuffer) >= QueryWorkBufferSize(orderMax));
return(Initialize(address, size, blockSize, orderMax));
}
public static int QueryOrderMax(nuint size, nuint blockSize)
{
Assert.SdkRequiresGreaterEqual(size, blockSize);
Assert.SdkRequiresGreaterEqual(blockSize, BlockSizeMin);
Assert.SdkRequires(BitUtil.IsPowerOfTwo(blockSize));
int blockCount = (int)(Alignment.AlignUpPow2(size, (uint)blockSize) / blockSize);
for (int order = 1; ; order++)
{
if (blockCount <= GetBlockCountFromOrder(order))
{
return(order);
}
}
}
public static int QueryOrderMax(nuint size, nuint blockSize)
{
Assert.True(size >= blockSize);
Assert.True(blockSize >= BlockSizeMin);
Assert.True(BitUtil.IsPowerOfTwo(blockSize));
int blockCount = (int)(Alignment.AlignUpPow2(size, (uint)blockSize) / blockSize);
for (int order = 1; ; order++)
{
if (blockCount <= GetBlockCountFromOrder(order))
{
return(order);
}
}
}