HistoryBlob.php

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<?php

# Pure virtual parent
class HistoryBlob
{
        function setMeta() {}
        function getMeta() {}
        function addItem() {}
        function getItem() {}
}

# The real object
class ConcatenatedGzipHistoryBlob
{
        /* private */ var $mVersion = 0, $mCompressed = false, $mItems = array();

        function HistoryBlob() {
                if ( !function_exists( 'gzdeflate' ) ) {
                        die( "Need zlib support to read or write this kind of history object (ConcatenatedGzipHistoryBlob)\n" );
                }
        }
        
        function setMeta( $metaData ) {
                $this->uncompress();
                $this->mItems['meta'] = $metaData;
        }

        function getMeta() {
                $this->uncompress();
                return $this->mItems['meta'];
        }
        
        function addItem( $text ) {
                $this->uncompress();
                $this->mItems[md5($text)] = $text;
        }

        function getItem( $hash ) {
                $this->compress();
                return $this->mItems[$hash];
        }

        function compress() {
                if ( !$this->mCompressed  ) {
                        $this->mItems = gzdeflate( serialize( $this->mItems ) );
                        $this->mCompressed = true;
                }
        }

        function uncompress() { 
                if ( $this->mCompressed ) {
                        $this->mItems = unserialize( gzinflate( $this->mItems ) );
                }
        }

        function __sleep() {
                compress();
        }

        function __wakeup() {
                uncompress();
        }
}
?>

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