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Eliminate two allocations in Crc32

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This commit is contained in:
Jason Nelson
2020-07-31 16:55:07 -07:00
parent 62f7238796
commit fa1e773960
1 changed files with 4 additions and 4 deletions
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8
src/SharpCompress/Compressors/Deflate/CRC32.cs
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@@ -189,7 +189,7 @@ namespace SharpCompress.Compressors.Deflate
// pre-initialize the crc table for speed of lookup.
private uint gf2_matrix_times(uint[] matrix, uint vec)
private uint gf2_matrix_times(ReadOnlySpan<uint> matrix, uint vec)
{
uint sum = 0;
int i = 0;
@@ -205,7 +205,7 @@ namespace SharpCompress.Compressors.Deflate
return sum;
}
private void gf2_matrix_square(uint[] square, uint[] mat)
private void gf2_matrix_square(Span<uint> square, Span<uint> mat)
{
for (int i = 0; i < 32; i++)
{
@@ -225,8 +225,8 @@ namespace SharpCompress.Compressors.Deflate
/// <param name="length">the length of data the CRC value was calculated on</param>
public void Combine(int crc, int length)
{
var even = new uint[32]; // even-power-of-two zeros operator
var odd = new uint[32]; // odd-power-of-two zeros operator
Span<uint> even = stackalloc uint[32]; // even-power-of-two zeros operator
Span<uint> odd = stackalloc uint[32]; // odd-power-of-two zeros operator
if (length == 0)
{