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Optimize LZ OutWindow.CopyBlock

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This commit is contained in:
J.D. Purcell
2025-03-19 22:29:38 -04:00
parent 8f03841161
commit c2d9bf94d1
1 changed files with 37 additions and 17 deletions
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54
src/SharpCompress/Compressors/LZMA/LZ/LzOutWindow.cs
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@@ -85,28 +85,56 @@ internal class OutWindow
_streamPos = _pos;
}
public void CopyBlock(int distance, int len)
public void CopyPending()
{
var size = len;
var pos = _pos - distance - 1;
if (pos < 0)
if (_pendingLen < 1)
{
pos += _windowSize;
return;
}
for (; size > 0 && _pos < _windowSize && _total < _limit; size--)
var rem = _pendingLen;
var pos = (_pendingDist < _pos ? _pos : _pos + _windowSize) - _pendingDist - 1;
while (rem > 0 && HasSpace)
{
if (pos >= _windowSize)
{
pos = 0;
}
_buffer[_pos++] = _buffer[pos++];
_total++;
PutByte(_buffer[pos++]);
rem--;
}
_pendingLen = rem;
}
public void CopyBlock(int distance, int len)
{
var rem = len;
var pos = (distance < _pos ? _pos : _pos + _windowSize) - distance - 1;
var targetSize = HasSpace ? (int)Math.Min(rem, _limit - _total) : 0;
var sizeUntilWindowEnd = Math.Min(_windowSize - _pos, _windowSize - pos);
var sizeUntilOverlap = Math.Abs(pos - _pos);
var fastSize = Math.Min(Math.Min(sizeUntilWindowEnd, sizeUntilOverlap), targetSize);
if (fastSize >= 2)
{
_buffer.AsSpan(pos, fastSize).CopyTo(_buffer.AsSpan(_pos, fastSize));
_pos += fastSize;
pos += fastSize;
_total += fastSize;
if (_pos >= _windowSize)
{
Flush();
}
rem -= fastSize;
}
_pendingLen = size;
while (rem > 0 && HasSpace)
{
if (pos >= _windowSize)
{
pos = 0;
}
PutByte(_buffer[pos++]);
rem--;
}
_pendingLen = rem;
_pendingDist = distance;
}
@@ -207,13 +235,5 @@ internal class OutWindow
return value;
}
public void CopyPending()
{
if (_pendingLen > 0)
{
CopyBlock(_pendingDist, _pendingLen);
}
}
public int AvailableBytes => _pos - _streamPos;
}