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[release/7.0] Base64.Decode: fixed latent bug for non-ASCII inputs #76812

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Merged
carlossanlop merged 4 commits into from
Oct 10, 2022
Merged

[release/7.0] Base64.Decode: fixed latent bug for non-ASCII inputs #76812

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47ac72d
Added test cases
gfoidl Oct 9, 2022
e0d960d
Fix
gfoidl Oct 9, 2022
a235138
Use unicode escape sequence in tests
gfoidl Oct 9, 2022
ceca9ab
Apply suggestions from code review
adamsitnik Oct 10, 2022
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@gfoidl
gfoidl authored and github-actions committed Oct 10, 2022
commit e0d960d770f7c91c5b0227246c04d34a975f4714
3 changes: 2 additions & 1 deletion src/libraries/System.Private.CoreLib/src/System/Buffers/Text/Base64Decoder.cs
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Expand Up @@ -592,8 +592,9 @@ private static unsafe void Vector128Decode(ref byte* srcBytes, ref byte* destByt

// lookup
Vector128<byte> hiNibbles = Vector128.ShiftRightLogical(str.AsInt32(), 4).AsByte() & mask2F;
Vector128<byte> loNibbles = str & mask2F;
Vector128<byte> hi = SimdShuffle(lutHi, hiNibbles, mask8F);
Vector128<byte> lo = SimdShuffle(lutLo, str, mask8F);
Vector128<byte> lo = SimdShuffle(lutLo, loNibbles, mask8F);

// Check for invalid input: if any "and" values from lo and hi are not zero,
// fall back on bytewise code to do error checking and reporting:
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