internal static unsafe string Stringify(Asn1Tag tag)
{
byte * stackspace = stackalloc byte[10];
Span <byte> dest = new Span <byte>(stackspace, 10);
Assert.True(tag.TryEncode(dest, out int size));
return(dest.Slice(0, size).ByteArrayToHex());
}
public static void VerifyEncode(TagClass tagClass, int tagValue, bool constructed, string expectedHex)
{
Asn1Tag tag = new Asn1Tag(tagClass, tagValue, constructed);
Span <byte> buf = stackalloc byte[10];
Assert.False(tag.TryEncode(Span <byte> .Empty, out int written));
Assert.Equal(0, written);
int expectedSize = expectedHex.Length / 2;
Assert.Equal(expectedSize, tag.CalculateEncodedSize());
Assert.False(tag.TryEncode(buf.Slice(0, expectedSize - 1), out written));
Assert.Equal(0, written);
AssertExtensions.Throws <ArgumentException>(
"destination",
() =>
{
Span <byte> tmp = stackalloc byte[expectedSize - 1];
return(tag.Encode(tmp));
});
Assert.True(tag.TryEncode(buf, out written));
Assert.Equal(expectedSize, written);
Assert.Equal(expectedHex, buf.Slice(0, written).ByteArrayToHex());
written = tag.Encode(buf.Slice(1));
Assert.Equal(expectedSize, written);
Assert.Equal(expectedHex, buf.Slice(1, written).ByteArrayToHex());
Assert.True(tag.TryEncode(buf.Slice(0, expectedSize), out written));
Assert.Equal(expectedSize, written);
Assert.Equal(expectedHex, buf.Slice(0, written).ByteArrayToHex());
written = tag.Encode(buf.Slice(1, expectedSize));
Assert.Equal(expectedSize, written);
Assert.Equal(expectedHex, buf.Slice(1, written).ByteArrayToHex());
}
