Bug #73944 [NEW]: dictionary option does not work

From: someone dot wanted dot to dot be dot unknown at gmail dot com Operating system: Windows 10 x64 PHP version: 7.1.0 Package: Zlib related Bug Type: Bug Bug description:dictionary option does not work Description: ------------ I'm writing an unpacker of MSZIP blocks that use deflate compression. I faced a problem and created a question on stackoverflow (http://stackoverflow.com/questions/41653663/is-there-something-special-in-windows-mszip-format-or-cfdata-in-cab-files), where maintainer of zlib library adviced to use dictionary option to pass raw uncompressed data of previous block to decompress next block of data. But Mark Adler says that this option don't work in current php realisation. > Looks like a bug. I can't get the dictionary option to work at all, even with strings that don't have nulls. Test script: --------------- $in = inflate_init(ZLIB_ENCODING_RAW); $a = inflate_add($in, file_get_contents('https://github.com/wapmorgan/CabArchive/releases/download/0.0.1-dev/1block')); echo '1 block: '.strlen($a).PHP_EOL; $in = inflate_init(ZLIB_ENCODING_RAW, array('dictionary' => str_replace("\00", null, $a)."\00")); $b = inflate_add($in, file_get_contents('https://github.com/wapmorgan/CabArchive/releases/download/0.0.1-dev/2block')); echo '2 block: '.($b === false ? 'failed' : strlen($b)).PHP_EOL; Expected result: ---------------- 1 block: 32768 2 block: 32768 Actual result: -------------- 1 block: 32768 2 block: failed -- Edit bug report at https://bugs.php.net/bug.php?id=73944&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=73944&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=73944&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=73944&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=73944&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=73944&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=73944&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=73944&r=needscript Try newer version: https://bugs.php.net/fix.php?id=73944&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=73944&r=support Expected behavior: https://bugs.php.net/fix.php?id=73944&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=73944&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=73944&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=73944&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=73944&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=73944&r=dst IIS Stability: https://bugs.php.net/fix.php?id=73944&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=73944&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=73944&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=73944&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=73944&r=mysqlcfg