https://issues.apache.org/bugzilla/show_bug.cgi?id=44886
--- Comment #7 from Josh Micich <[EMAIL PROTECTED]> 2008-04-28 01:38:16 PST --- (In reply to comment #4) > If we can trust the comments in that document, then: > 3. The means of determining this is > blip_instance ^ blip_signature == 1, where both of these values appear to > be nontrivial to compute (to me anyway.) I guess you got this from page 17. The full text is: "The primary UID is only saved to disk if (blip_instance ^ blip_signature == 1). Blip_instance is MSOFBH.inst and blip_signature is one of the values defined in MSOBI" MSFOBH seems to be the common record header from page 8. I believe the POI class EscherRecordHeader corresponds to this: MSOFBH.ver,inst <=> EscherRecordHeader.options MSOFBH.fbt <=> EscherRecordHeader.recordId MSOFBH.cbLength <=> EscherRecordHeader.remainingBytes So the inst field probably corresponds to EscherRecord.getInstance() MSOBI enum is mentioned on page 15. It's not clear to me how to calculate blip_signature. The exclusive or operator giving a result of 1 is also a bit weird here. Note that none of the constants from MSOBI have the LSB set. So perhaps the test for writing the extra UID is whether the LSB of EscherRecord.getInstance() is set. Perhaps the expression was written as such to emphasize that this rule only works when blip_signature == EscherRecord.getInstance() & 0x0FFE. This is all speculation on my part. You might be best to verify the behaviour empirically. Two existing POI junits hit the method EscherMetafileBlip.fillFields() 4 times: TestHSSFPictureData.testPictures() line: 45 "SimpleWithImages.xls" TestOLE2Embeding.testEmbeding() line: 36 "ole2-embedding.xls" - so perhaps with these files, and your current examples you can decipher Microsoft's cryptic description of the m_rgbUidPrimary field. -- Configure bugmail: https://issues.apache.org/bugzilla/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are the assignee for the bug. --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
