From: Operating system: PHP version: Irrelevant Package: *Encryption and hash functions Bug Type: Feature/Change Request Bug description:$offset parameter for md5_file() and sha1_file()
Description: ------------ There are some functions that calculate hash from a file, e.g., md5_file() and sha1_file(), but they work only for whole files. There's also a function (or a language construct?) __halt_compiler(), which is useful for making "installers", as it allows to mix PHP code and binary data (e.g., compressed archive) in a single file. To make sure that whole "installer" is correctly downloaded, it would be worth to validate checksum of binary data by comparing it with value of checksum that is stored in PHP code part (i.e., before __halt_compiler()). Currently, checksum of binary data may be calculated by fully loading binary data and calling md5() or sha1() on a string. It is not a problem for smaller installers, but if installer is larger (e.g., because of having lots of images in it), it might require too much memory to be loaded into a string. In this case, it would be handy to use md5_file() or sha1_file() with 3rd parameter - $offset, something like md5_file($filename, false, __COMPILER_HALT_OFFSET__). Any chance to see it implemented some day? -- Edit bug report at http://bugs.php.net/bug.php?id=54667&edit=1 -- Try a snapshot (PHP 5.2): http://bugs.php.net/fix.php?id=54667&r=trysnapshot52 Try a snapshot (PHP 5.3): http://bugs.php.net/fix.php?id=54667&r=trysnapshot53 Try a snapshot (trunk): http://bugs.php.net/fix.php?id=54667&r=trysnapshottrunk Fixed in SVN: http://bugs.php.net/fix.php?id=54667&r=fixed Fixed in SVN and need be documented: http://bugs.php.net/fix.php?id=54667&r=needdocs Fixed in release: http://bugs.php.net/fix.php?id=54667&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=54667&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=54667&r=needscript Try newer version: http://bugs.php.net/fix.php?id=54667&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=54667&r=support Expected behavior: http://bugs.php.net/fix.php?id=54667&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=54667&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=54667&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=54667&r=globals PHP 4 support discontinued: http://bugs.php.net/fix.php?id=54667&r=php4 Daylight Savings: http://bugs.php.net/fix.php?id=54667&r=dst IIS Stability: http://bugs.php.net/fix.php?id=54667&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=54667&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=54667&r=float No Zend Extensions: http://bugs.php.net/fix.php?id=54667&r=nozend MySQL Configuration Error: http://bugs.php.net/fix.php?id=54667&r=mysqlcfg
