[Mono-bugs] [Bug 708821] New: System.Text.Decoder.GetChars doesn't work

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https://bugzilla.novell.com/show_bug.cgi?id=708821

https://bugzilla.novell.com/show_bug.cgi?id=708821#c0


           Summary: System.Text.Decoder.GetChars doesn't work
    Classification: Mono
           Product: Mono: Class Libraries
           Version: 2.10.x
          Platform: Other
        OS/Version: Other
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: Sys.Core
        AssignedTo: mono-bugs at lists.ximian.com
        ReportedBy: post-christian at freenet.de
         QAContact: mono-bugs at lists.ximian.com
                CC: post-christian at freenet.de
          Found By: Development
           Blocker: ---


Description of Problem:

In corlib/System.Text/Decoder.css the function 

[CLSCompliant (false)]
[ComVisible (false)]
public unsafe virtual int GetChars (byte* bytes, int byteCount,
    char* chars, int charCount, bool flush)
{
    CheckArguments (chars, charCount, bytes, byteCount);

    char [] carr = new char [charCount];
    Marshal.Copy ((IntPtr) chars, carr, 0, charCount);
    byte [] barr = new byte [byteCount];
    Marshal.Copy ((IntPtr) bytes, barr, 0, byteCount);
    return GetChars (barr, 0, byteCount, carr, 0, flush);
}

doesn't make sense. Marshal.Copy ((IntPtr) chars, carr, 0, charCount); copies
an undefinied output buffer to an internal carr buffer and decodes then the
characters into the internal carr buffer. Marshal.Copy should copy carr to the
output buffer after decoding in my mind.

Steps to reproduce the problem:

char[] dst = new char[4];
byte[] src = new byte[] { 65 };
Decoder dec = Encoding.UTF8.GetDecoder();
fixed( char* _dst = dst ) {
    fixed( byte* _src = src ) {
        if( dec.GetChars( _src, 1, _dst, 1, true ) > 0 )
            Console.WriteLine( "character: {0}", (int) *_dst );
    }
}

Actual Results:

character: 0

Expected Results:

character: 65

How often does this happen? 

everytime

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