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minor refactoring and tests
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This commit is contained in:
JustFixMe
2025-08-06 22:02:38 +04:00
parent 7eb3008738
commit 312219d42f
5 changed files with 189 additions and 76 deletions
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56
Core/Base32.cs
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@@ -16,9 +16,9 @@ public static class Base32
? stackalloc char[outLength]
: new char[outLength];
_ = Encode(input, output);
var size = Encode(input, output);
return new string(output);
return new string(output[..size]);
}
[Pure]
@@ -26,20 +26,31 @@ public static class Base32
{
if (input.IsEmpty) return 0;
int outputLength = 8 * ((input.Length + 4) / 5);
if (output.Length < outputLength)
{
throw new ArgumentException("Encoded input can not fit in output span.", nameof(output));
}
output = output[..outputLength];
int i = 0;
ReadOnlySpan<char> alphabet = Alphabet;
Span<byte> alphabetKeys = stackalloc byte[8];
for (int offset = 0; offset < input.Length;)
{
int numCharsToOutput = GetNextGroup(input, ref offset, out byte a, out byte b, out byte c, out byte d, out byte e, out byte f, out byte g, out byte h);
alphabetKeys.Clear();
int numCharsToOutput = GetNextGroup(input, ref offset, alphabetKeys);
output[i++] = (numCharsToOutput > 0) ? alphabet[a] : Padding;
output[i++] = (numCharsToOutput > 1) ? alphabet[b] : Padding;
output[i++] = (numCharsToOutput > 2) ? alphabet[c] : Padding;
output[i++] = (numCharsToOutput > 3) ? alphabet[d] : Padding;
output[i++] = (numCharsToOutput > 4) ? alphabet[e] : Padding;
output[i++] = (numCharsToOutput > 5) ? alphabet[f] : Padding;
output[i++] = (numCharsToOutput > 6) ? alphabet[g] : Padding;
output[i++] = (numCharsToOutput > 7) ? alphabet[h] : Padding;
output[i++] = (numCharsToOutput > 0) ? alphabet[alphabetKeys[0]] : Padding;
output[i++] = (numCharsToOutput > 1) ? alphabet[alphabetKeys[1]] : Padding;
output[i++] = (numCharsToOutput > 2) ? alphabet[alphabetKeys[2]] : Padding;
output[i++] = (numCharsToOutput > 3) ? alphabet[alphabetKeys[3]] : Padding;
output[i++] = (numCharsToOutput > 4) ? alphabet[alphabetKeys[4]] : Padding;
output[i++] = (numCharsToOutput > 5) ? alphabet[alphabetKeys[5]] : Padding;
output[i++] = (numCharsToOutput > 6) ? alphabet[alphabetKeys[6]] : Padding;
output[i++] = (numCharsToOutput > 7) ? alphabet[alphabetKeys[7]] : Padding;
}
return i;
}
@@ -66,6 +77,11 @@ public static class Base32
input = input.TrimEnd(Padding);
var outputLength = 5 * ((input.Length + 7) / 8);
if (output.Length < outputLength)
{
throw new ArgumentException("Decoded input can not fit in output span.", nameof(output));
}
output = output[..outputLength];
output.Clear();
@@ -119,7 +135,7 @@ public static class Base32
// returns the number of bytes that were output
[Pure]
private static int GetNextGroup(ReadOnlySpan<byte> input, ref int offset, out byte a, out byte b, out byte c, out byte d, out byte e, out byte f, out byte g, out byte h)
private static int GetNextGroup(ReadOnlySpan<byte> input, ref int offset, Span<byte> alphabetKeys)
{
var retVal = (input.Length - offset) switch
{
@@ -135,14 +151,14 @@ public static class Base32
uint b4 = (offset < input.Length) ? input[offset++] : 0U;
uint b5 = (offset < input.Length) ? input[offset++] : 0U;
a = (byte)(b1 >> 3);
b = (byte)(((b1 & 0x07) << 2) | (b2 >> 6));
c = (byte)((b2 >> 1) & 0x1f);
d = (byte)(((b2 & 0x01) << 4) | (b3 >> 4));
e = (byte)(((b3 & 0x0f) << 1) | (b4 >> 7));
f = (byte)((b4 >> 2) & 0x1f);
g = (byte)(((b4 & 0x3) << 3) | (b5 >> 5));
h = (byte)(b5 & 0x1f);
alphabetKeys[0] = (byte)(b1 >> 3);
alphabetKeys[1] = (byte)(((b1 & 0x07) << 2) | (b2 >> 6));
alphabetKeys[2] = (byte)((b2 >> 1) & 0x1f);
alphabetKeys[3] = (byte)(((b2 & 0x01) << 4) | (b3 >> 4));
alphabetKeys[4] = (byte)(((b3 & 0x0f) << 1) | (b4 >> 7));
alphabetKeys[5] = (byte)((b4 >> 2) & 0x1f);
alphabetKeys[6] = (byte)(((b4 & 0x3) << 3) | (b5 >> 5));
alphabetKeys[7] = (byte)(b5 & 0x1f);
return retVal;
}