kali834x opened a new pull request, #787:
URL: https://github.com/apache/commons-compress/pull/787

   the certificate-id extra fields read rcount as a 2-byte zipshort at offset 
and read hashalg from offset+2, but the field layout documented on both classes 
(and the reading in the sibling x0017_strongencryptionheader) puts a 4-byte 
rcount first with hashalg at offset+4. as written, 
x0015_certificateidforfile.parseFromCentralDirectoryData and the x0016 
equivalent expose only the low 16 bits of rcount through getRecordCount and 
derive getHashAlgorithm from the high half of the count. read rcount as a 
4-byte ziplong and hashalg at offset+4 in both, and raise the minimal-length 
check from 4 to 6 so a block too short to hold both fields is rejected with a 
zipexception rather than parsed into garbage. getRecordCount stays int (the 4 
bytes are read then narrowed) so the public api is unchanged.
   
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