<div dir="ltr">Dear colleagues,<div><br></div><div>I quickly compared 6.2, 6.3, and 6.3.3. Technically, I find </div><div>three issues: (1) more hash algorithms, (2) UTF-8, and </div><div>(3) OPC Growth Hint. I prefer 6.3.3 to 6.2, because of (2).</div><div>How do you feel?</div><div><br></div><div>Regards,</div><div>Makoto</div><div><br></div><div><div><br></div><div>> 6.3.0 -Added tape positioning storage 09/29/2006</div><div>> parameters</div><div><br></div><div>Irrelevant since OPC does not use tape positioning storage parameters.</div><div><br></div><div>> -Expanded list of supported hash algorithms</div><div><br></div><div>Three values of Hash ID are added.</div><div><br></div><div> 0x8007 RIPEMD160</div><div> 0x800C SHA256</div><div> 0x800D SHA384</div><div> 0x800E SHA512</div><div><br></div><div>> </div><div>> -Expanded list of supported compression</div><div>> algorithms</div><div><br></div><div>Irrelevant since OPC uses DEFLATE and nothing else.</div><div><br></div><div> </div><div>> -Expanded list of supported encryption</div><div>> algorithms</div><div><br></div><div>Irrelevant since OPC does not use ZIP encryption.</div><div>> </div><div>> -Added option for Unicode filename </div><div>> storage</div><div><br></div><div>This is important if we would like to allow verbatim UTF-8.</div><div> </div><div>> -Clarifications for consistent use</div><div>> of Data Descriptor records</div><div>> </div><div>> -Added additional "Extra Field" </div><div>> definitions</div><div><br></div><div>This addition includes Growth Hint of OPC. If the </div><div>OPC revision uses 6.3.3, it would look more consistent.</div><div>But OPC already has Growth Hint anyway.</div><div><br></div><div>> 6.3.1 -Corrected standard hash values for 04/11/2007</div><div>> SHA-256/384/512</div><div>> </div><div>> 6.3.2 -Added compression method 97 09/28/2007</div><div>> </div><div>> -Documented InfoZIP "Extra Field"</div><div>> values for UTF-8 file name and</div><div>> file comment storage</div><div><br></div><div>We should prohibit this field.</div><div><br></div><div>> </div><div>> 6.3.3 -Formatting changes to support 09/01/2012</div><div>> easier referencing of this APPNOTE</div><div>> from other documents and standards </div><div><br></div><div>This is not technical but purely editorial. But if you compare 6.3.3</div><div>and preceding versions, you will find very many differences.</div><div><br></div>-- <br><div class="gmail_signature"><br>Praying for the victims of the Japan Tohoku earthquake<br><br>Makoto</div>
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