Add Convert Span-based APIs #22848
Description
Separated out of https://github.com/dotnet/corefx/issues/21281 for tracking purposes.
- Implement in System.Private.CoreLib in coreclr ("shared" with corert)
- Expose from System.Runtime.Extensions contract in corefx
- Add tests to System.Runtime.Extensions tests in corefx
namespace System
{
public class Convert
{
public static string ToBase64String(ReadOnlySpan<byte> bytes, Base64FormattingOptions options = Base64FormattingOptions.None);
public static TransformationStatus ToBase64Chars(ReadOnlySpan<byte> bytes, Span<char> chars, out int bytesConsumed, out int charsWritten, Base64FormattingOptions options = Base64FormattingOptions.None);
public static TransformationStatus FromBase64(string s, Span<byte> destination, out int charsConsumed, out int bytesWritten, Base46FormattingOptions options = ...);
public static TransformationStatus FromBase64(ReadOnlySpan<char> s, Span<byte> destination, out int charsConsumed, out int bytesWritten, Base46FormattingOptions options = ...);
…
}
}Mostly approved, but needed to re-verify approach with TransformationStatus.
Depends on https://github.com/dotnet/corefx/issues/22412.