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Clarified comment per CR r111701

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This commit is contained in:
Tim Starling 2012-02-17 00:28:17 +00:00
parent e1ee5c469b
commit 346181cce1
1 changed files with 3 additions and 2 deletions
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5
includes/HistoryBlob.php
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@ -567,10 +567,11 @@ class DiffHistoryBlob implements HistoryBlob {
function xdiffAdler32( $s ) {
static $init;
if ( $init === null ) {
// The real Adler-32 checksum of this string is zero, so it
// initialises the state to the LibXDiff initial value.
$init = str_repeat( "\xf0", 205 ) . "\xee" . str_repeat( "\xf0", 67 ) . "\x02";
}
// The real Adler-32 checksum of $init is zero, so it initialises the
// state to zero, as it is at the start of LibXDiff's checksum
// algorithm. Appending the subject string then simulates LibXDiff.
if ( function_exists( 'hash' ) ) {
$hash = hash( 'adler32', $init . $s, true );
} elseif ( function_exists( 'mhash' ) ) {