private ByteVault GetVault(int sizeHint)
{
int bufferSizeToAllocate = 0;
if (sizeHint == 0)
{
if (this.lastVault == null || this.lastVault.Remaining == 0)
{
bufferSizeToAllocate = DefaultVaultSize;
}
}
else
{
if (this.lastVault == null || this.lastVault.Remaining < sizeHint)
{
bufferSizeToAllocate = Math.Max(sizeHint, DefaultVaultSize);
}
}
if (bufferSizeToAllocate > 0)
{
var vault = new ByteVault(arrayPool.Rent(bufferSizeToAllocate));
this.AddVault(vault);
}
return(this.lastVault !);
}
private void AddVault(ByteVault vault)
{
if (this.lastVault == null)
{
this.firstVault = this.lastVault = vault;
}
else
{
if (this.lastVault.Size > 0)
{// Add a new block.
this.lastVault.SetNext(vault);
}
else
{// The last block is completely unused. Replace it instead of appending to it.
var current = this.firstVault !;
if (this.firstVault == this.lastVault)
{ // Only one vault.
this.firstVault = vault;
}
else
{
while (current.Next != this.lastVault)
{
current = (ByteVault)current.Next !;
}
}
arrayPool.Return(this.lastVault.Array);
this.lastVault.Clear();
current.SetNext(vault);
}
this.lastVault = vault;
}
}
internal void SetNext(ByteVault next)
{
this.Next = next;
next.RunningIndex = this.RunningIndex + this.Size;
this.Memory = this.Memory.Slice(0, this.Size);
}