1 files changed, 240 insertions, 0 deletions
diff --git a/vendor/wikimedia/cdb/src/Writer/PHP.php b/vendor/wikimedia/cdb/src/Writer/PHP.php
new file mode 100644
index 00000000..68c6b760
--- /dev/null
+++ b/vendor/wikimedia/cdb/src/Writer/PHP.php
@@ -0,0 +1,240 @@
+<?php
+
+namespace Cdb\Writer;
+use Cdb\Exception;
+use Cdb\Util;
+use Cdb\Writer;
+
+/**
+ * This is a port of D.J. Bernstein's CDB to PHP. It's based on the copy that
+ * appears in PHP 5.3. Changes are:
+ *    * Error returns replaced with exceptions
+ *    * Exception thrown if sizes or offsets are between 2GB and 4GB
+ *    * Some variables renamed
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ * @file
+ */
+
+/**
+ * CDB writer class
+ */
+class PHP extends Writer {
+	protected $hplist;
+
+	protected $numentries;
+
+	protected $pos;
+
+	/**
+	 * @param string $fileName
+	 */
+	public function __construct( $fileName ) {
+		$this->realFileName = $fileName;
+		$this->tmpFileName = $fileName . '.tmp.' . mt_rand( 0, 0x7fffffff );
+		$this->handle = fopen( $this->tmpFileName, 'wb' );
+		if ( !$this->handle ) {
+			$this->throwException(
+				'Unable to open CDB file "' . $this->tmpFileName . '" for write.' );
+		}
+		$this->hplist = array();
+		$this->numentries = 0;
+		$this->pos = 2048; // leaving space for the pointer array, 256 * 8
+		if ( fseek( $this->handle, $this->pos ) == -1 ) {
+			$this->throwException( 'fseek failed in file "' . $this->tmpFileName . '".' );
+		}
+	}
+
+	/**
+	 * @param string $key
+	 * @param string $value
+	 */
+	public function set( $key, $value ) {
+		if ( strval( $key ) === '' ) {
+			// DBA cross-check hack
+			return;
+		}
+		$this->addbegin( strlen( $key ), strlen( $value ) );
+		$this->write( $key );
+		$this->write( $value );
+		$this->addend( strlen( $key ), strlen( $value ), Util::hash( $key ) );
+	}
+
+	/**
+	 * @throws Exception
+	 */
+	public function close() {
+		$this->finish();
+		if ( isset( $this->handle ) ) {
+			fclose( $this->handle );
+		}
+		if ( $this->isWindows() && file_exists( $this->realFileName ) ) {
+			unlink( $this->realFileName );
+		}
+		if ( !rename( $this->tmpFileName, $this->realFileName ) ) {
+			$this->throwException( 'Unable to move the new CDB file into place.' );
+		}
+		unset( $this->handle );
+	}
+
+	/**
+	 * @throws Exception
+	 * @param string $buf
+	 */
+	protected function write( $buf ) {
+		$len = fwrite( $this->handle, $buf );
+		if ( $len !== strlen( $buf ) ) {
+			$this->throwException( 'Error writing to CDB file "' . $this->tmpFileName . '".' );
+		}
+	}
+
+	/**
+	 * @throws Exception
+	 * @param int $len
+	 */
+	protected function posplus( $len ) {
+		$newpos = $this->pos + $len;
+		if ( $newpos > 0x7fffffff ) {
+			$this->throwException(
+				'A value in the CDB file "' . $this->tmpFileName . '" is too large.' );
+		}
+		$this->pos = $newpos;
+	}
+
+	/**
+	 * @param int $keylen
+	 * @param int $datalen
+	 * @param int $h
+	 */
+	protected function addend( $keylen, $datalen, $h ) {
+		$this->hplist[] = array(
+			'h' => $h,
+			'p' => $this->pos
+		);
+
+		$this->numentries++;
+		$this->posplus( 8 );
+		$this->posplus( $keylen );
+		$this->posplus( $datalen );
+	}
+
+	/**
+	 * @throws Exception
+	 * @param int $keylen
+	 * @param int $datalen
+	 */
+	protected function addbegin( $keylen, $datalen ) {
+		if ( $keylen > 0x7fffffff ) {
+			$this->throwException( 'Key length too long in file "' . $this->tmpFileName . '".' );
+		}
+		if ( $datalen > 0x7fffffff ) {
+			$this->throwException( 'Data length too long in file "' . $this->tmpFileName . '".' );
+		}
+		$buf = pack( 'VV', $keylen, $datalen );
+		$this->write( $buf );
+	}
+
+	/**
+	 * @throws Exception
+	 */
+	protected function finish() {
+		// Hack for DBA cross-check
+		$this->hplist = array_reverse( $this->hplist );
+
+		// Calculate the number of items that will be in each hashtable
+		$counts = array_fill( 0, 256, 0 );
+		foreach ( $this->hplist as $item ) {
+			++$counts[255 & $item['h']];
+		}
+
+		// Fill in $starts with the *end* indexes
+		$starts = array();
+		$pos = 0;
+		for ( $i = 0; $i < 256; ++$i ) {
+			$pos += $counts[$i];
+			$starts[$i] = $pos;
+		}
+
+		// Excessively clever and indulgent code to simultaneously fill $packedTables
+		// with the packed hashtables, and adjust the elements of $starts
+		// to actually point to the starts instead of the ends.
+		$packedTables = array_fill( 0, $this->numentries, false );
+		foreach ( $this->hplist as $item ) {
+			$packedTables[--$starts[255 & $item['h']]] = $item;
+		}
+
+		$final = '';
+		for ( $i = 0; $i < 256; ++$i ) {
+			$count = $counts[$i];
+
+			// The size of the hashtable will be double the item count.
+			// The rest of the slots will be empty.
+			$len = $count + $count;
+			$final .= pack( 'VV', $this->pos, $len );
+
+			$hashtable = array();
+			for ( $u = 0; $u < $len; ++$u ) {
+				$hashtable[$u] = array( 'h' => 0, 'p' => 0 );
+			}
+
+			// Fill the hashtable, using the next empty slot if the hashed slot
+			// is taken.
+			for ( $u = 0; $u < $count; ++$u ) {
+				$hp = $packedTables[$starts[$i] + $u];
+				$where = Util::unsignedMod(
+					Util::unsignedShiftRight( $hp['h'], 8 ), $len );
+				while ( $hashtable[$where]['p'] ) {
+					if ( ++$where == $len ) {
+						$where = 0;
+					}
+				}
+				$hashtable[$where] = $hp;
+			}
+
+			// Write the hashtable
+			for ( $u = 0; $u < $len; ++$u ) {
+				$buf = pack( 'vvV',
+					$hashtable[$u]['h'] & 0xffff,
+					Util::unsignedShiftRight( $hashtable[$u]['h'], 16 ),
+					$hashtable[$u]['p'] );
+				$this->write( $buf );
+				$this->posplus( 8 );
+			}
+		}
+
+		// Write the pointer array at the start of the file
+		rewind( $this->handle );
+		if ( ftell( $this->handle ) != 0 ) {
+			$this->throwException( 'Error rewinding to start of file "' . $this->tmpFileName . '".' );
+		}
+		$this->write( $final );
+	}
+
+	/**
+	 * Clean up the temp file and throw an exception
+	 *
+	 * @param string $msg
+	 * @throws Exception
+	 */
+	protected function throwException( $msg ) {
+		if ( $this->handle ) {
+			fclose( $this->handle );
+			unlink( $this->tmpFileName );
+		}
+		throw new Exception( $msg );
+	}
+}