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List:       mono-bugs
Subject:    [Mono-bugs] [Bug 543332] New: Roundtripping
From:       bugzilla_noreply () novell ! com
Date:       2009-09-30 22:33:03
Message-ID: bug-543332-28286 () http ! bugzilla ! novell ! com/
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http://bugzilla.novell.com/show_bug.cgi?id=543332


           Summary: Roundtripping XmlReader.ReadElementContentAsBase64 and
                    XmlWriter.WriteBase64 does not give identical results
    Classification: Mono
           Product: Mono: Class Libraries
           Version: 2.4.x
          Platform: x86-64
        OS/Version: Ubuntu
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: Sys.XML
        AssignedTo: atsushi@ximian.com
        ReportedBy: anton@lauridsen.info
         QAContact: mono-bugs@lists.ximian.com
          Found By: ---


User-Agent:       Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.0.14)
Gecko/2009090217 Ubuntu/9.04 (jaunty) Firefox/3.0.14

I would expect that "round-tripping" an array, by first writing to an Base64
element, and then reading the same element back, would produce output identical
to the input, but that turns out not to be consistently true.

Reproducible: Always

Steps to Reproduce:
1) define an array like this:

byte[] fakeState = new byte[1024];
for(int i = 0; i<fakeState.Length; i++)
   fakeState[i] = (byte)(i & 0xff);

2) write the array using XmlWriter.WriteBase64, either to a string or a file
3) read the data back from xml, using code similar to this:

byte[] fixedSizeBuffer = new byte[1024];

                                // we cannot completely trust the length read
to indicate the end.
                                int bytesRead;
                                do
                                {
                                    bytesRead =
reader.ReadElementContentAsBase64(fixedSizeBuffer, 0, 1024);
                                    Console.WriteLine(bytesRead + " " +
reader.NodeType.ToString());
                                    if(bytesRead > 0)
                                    {
                                        if(readDataBuffer == null)
                                            readDataBuffer = new byte[0];

                                        int oldLength = readDataBuffer.Length;
                                        Array.Resize(ref readDataBuffer,
oldLength + bytesRead);
                                        Array.Copy(fixedSizeBuffer, 0,
readDataBuffer, oldLength, bytesRead);
                                    }
                                } while(bytesRead > 0 && reader.NodeType ==
XmlNodeType.Text);

produces an output array with 1026 elements, and output like this:
1024 Text
2 EndElement

I would have expected to see:
1024 Text
0 EndElement

and an array with a length of 1024.

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