public void EnsureCapacity(int numBytes)
{
int required = position + numBytes;
while (required >= Capacity)
{
blocks.Add(SegmentPool.Acquire());
}
if (required > back)
{
back = required;
}
}
/// <summary>
/// Initializes a new instance of the Buffer class.
/// </summary>
public Buffer()
{
if (sizeExponent < 0 || 31 < sizeExponent)
{
throw new ArgumentOutOfRangeException();
}
blocks = new List <Segment>();
blocks.Add(SegmentPool.Acquire());
currentIndex = 0;
current = blocks[currentIndex];
position = 0;
back = 0;
front = 0;
marker = -1;
}
public void ListAvailableSegments(IList <ArraySegment <byte> > blockList)
{
if (back < Capacity)
{
if (level > minLevel)
{
--level;
}
}
else
{
if (level < maxLevel)
{
++level;
}
}
int roomFactor = 1 << level;
int numWholeBlocks = (Capacity - back) >> sizeExponent;
if (numWholeBlocks < roomFactor)
{
int count = (roomFactor - numWholeBlocks);
for (int i = 0; i < count; ++i)
{
blocks.Add(SegmentPool.Acquire());
}
}
int backIndex = back >> sizeExponent;
int backOffset = back & remainderMask;
blockList.Add(new ArraySegment <byte>(
blocks[backIndex].Array,
blocks[backIndex].Offset + backOffset,
BlockSize - backOffset));
for (int i = backIndex + 1, count = blocks.Count; i < count; ++i)
{
blockList.Add(new ArraySegment <byte>(
blocks[i].Array,
blocks[i].Offset,
BlockSize));
}
}
