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Convert if to switch statement.

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This commit is contained in:
Natalia Portillo
2022-11-13 19:38:02 +00:00
parent a9af82e47f
commit 55fb8416e8
4 changed files with 228 additions and 220 deletions
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60
Adler32Context.cs
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@@ -157,42 +157,44 @@ public sealed class Adler32Context : IChecksum
uint sum2 = preSum2;
var dataOff = 0;
/* in case user likes doing a byte at a time, keep it fast */
if(len == 1)
switch(len)
{
sum1 += data[dataOff];
if(sum1 >= ADLER_MODULE)
sum1 -= ADLER_MODULE;
sum2 += sum1;
if(sum2 >= ADLER_MODULE)
sum2 -= ADLER_MODULE;
preSum1 = (ushort)(sum1 & 0xFFFF);
preSum2 = (ushort)(sum2 & 0xFFFF);
return;
}
/* in case short lengths are provided, keep it somewhat fast */
if(len < 16)
{
while(len-- > 0)
/* in case user likes doing a byte at a time, keep it fast */
case 1:
{
sum1 += data[dataOff++];
sum1 += data[dataOff];
if(sum1 >= ADLER_MODULE)
sum1 -= ADLER_MODULE;
sum2 += sum1;
if(sum2 >= ADLER_MODULE)
sum2 -= ADLER_MODULE;
preSum1 = (ushort)(sum1 & 0xFFFF);
preSum2 = (ushort)(sum2 & 0xFFFF);
return;
}
/* in case short lengths are provided, keep it somewhat fast */
case < 16:
{
while(len-- > 0)
{
sum1 += data[dataOff++];
sum2 += sum1;
}
if(sum1 >= ADLER_MODULE)
sum1 -= ADLER_MODULE;
if(sum1 >= ADLER_MODULE)
sum1 -= ADLER_MODULE;
sum2 %= ADLER_MODULE; /* only added so many ADLER_MODULE's */
preSum1 = (ushort)(sum1 & 0xFFFF);
preSum2 = (ushort)(sum2 & 0xFFFF);
sum2 %= ADLER_MODULE; /* only added so many ADLER_MODULE's */
preSum1 = (ushort)(sum1 & 0xFFFF);
preSum2 = (ushort)(sum2 & 0xFFFF);
return;
return;
}
}
/* do length NMAX blocks -- requires just one modulo operation */