/// <summary>
/// Removes a front portion of the memory stream.
/// </summary>
public static void TrimStart(this ChunkedMemoryStream stream, int length)
{
// TODO: change RecyclableMemoryStream to allow every block to have
// an offset, so we don't need to shift data
if (stream == null)
{
throw new ArgumentNullException(nameof(stream));
}
stream.Position = 0;
if (length == 0)
{
return;
}
var helper = stream.GetBlockOffset(length);
stream.RemoveBlockRange(0, helper.Block);
// Now we need to shift data in trailing blocks.
for (int i = 0; i < stream.BlockCount; i++)
{
var currentBlock = stream.GetBlock(i);
int previous = i - 1;
if (previous >= 0)
{
var previousBlock = stream.GetBlock(previous);
var bytesToMoveBack = currentBlock.Slice(0, helper.Offset);
var backDst = previousBlock[^ helper.Offset..];
/// <summary>
/// Removes a front portion of the memory stream.
/// </summary>
public static void TrimStart(this ChunkedMemoryStream stream, int length)
{
// TODO: change ChunkedMemoryStream to allow every block to have
// an offset, so we don't need to shift data at least as much?
if (stream == null)
{
throw new ArgumentNullException(nameof(stream));
}
stream.Position = 0;
if (length == 0)
{
return;
}
(int block, int offset) = stream.GetBlockOffset(length);
stream.RemoveBlockRange(0, block);
// Now we need to shift data in trailing blocks.
for (int i = 0; i < stream.BlockCount; i++)
{
Memory <byte> currentBlock = stream.GetBlock(i);
int previous = i - 1;
if (previous >= 0)
{
Memory <byte> bytesToMoveBack = currentBlock.Slice(0, offset);
Memory <byte> previousBlock = stream.GetBlock(previous);
Memory <byte> backDestination = previousBlock[^ offset..];