--- /dev/null
+<?php
+/**
+ * MessagePack serializer
+ *
+ * MessagePack is a space-efficient binary data interchange format. This
+ * class provides a pack() method that encodes native PHP values as MessagePack
+ * binary strings. The implementation is derived from msgpack-php.
+ *
+ * Copyright (c) 2013 Ori Livneh <ori@wikimedia.org>
+ * Copyright (c) 2011 OnlineCity <https://github.com/onlinecity/msgpack-php>.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ *
+ * @see <http://msgpack.org/>
+ * @see <http://wiki.msgpack.org/display/MSGPACK/Format+specification>
+ *
+ * @since 1.23
+ * @file
+ */
+class MWMessagePack {
+ /** @var bool|null Whether current system is bigendian. **/
+ public static $bigendian = null;
+
+ /**
+ * Encode a value using MessagePack
+ *
+ * This method supports null, boolean, integer, float, string and array
+ * (both indexed and associative) types. Object serialization is not
+ * supported.
+ *
+ * @param mixed $value
+ * @return string
+ * @throws InvalidArgumentException if $value is an unsupported type or too long a string
+ */
+ public static function pack( $value ) {
+ if ( self::$bigendian === null ) {
+ self::$bigendian = pack( 'S', 1 ) === pack( 'n', 1 );
+ }
+
+ switch ( gettype( $value ) ) {
+ case 'NULL':
+ return "\xC0";
+
+ case 'boolean':
+ return $value ? "\xC3" : "\xC2";
+
+ case 'double':
+ case 'float':
+ return self::$bigendian
+ ? "\xCB" . pack( 'd', $value )
+ : "\xCB" . strrev( pack( 'd', $value ) );
+
+ case 'string':
+ $length = strlen( $value );
+ if ( $length < 32 ) {
+ return pack( 'Ca*', 0xA0 | $length, $value );
+ } elseif ( $length <= 0xFFFF ) {
+ return pack( 'Cna*', 0xDA, $length, $value );
+ } elseif ( $length <= 0xFFFFFFFF ) {
+ return pack( 'CNa*', 0xDB, $length, $value );
+ }
+ throw new InvalidArgumentException( __METHOD__
+ . ": string too long (length: $length; max: 4294967295)" );
+
+ case 'integer':
+ if ( $value >= 0 ) {
+ if ( $value <= 0x7F ) {
+ // positive fixnum
+ return chr( $value );
+ }
+ if ( $value <= 0xFF ) {
+ // uint8
+ return pack( 'CC', 0xCC, $value );
+ }
+ if ( $value <= 0xFFFF ) {
+ // uint16
+ return pack( 'Cn', 0xCD, $value );
+ }
+ if ( $value <= 0xFFFFFFFF ) {
+ // uint32
+ return pack( 'CN', 0xCE, $value );
+ }
+ if ( $value <= 0xFFFFFFFFFFFFFFFF ) {
+ // uint64
+ $hi = ( $value & 0xFFFFFFFF00000000 ) >> 32;
+ $lo = $value & 0xFFFFFFFF;
+ return self::$bigendian
+ ? pack( 'CNN', 0xCF, $lo, $hi )
+ : pack( 'CNN', 0xCF, $hi, $lo );
+ }
+ } else {
+ if ( $value >= -32 ) {
+ // negative fixnum
+ return pack( 'c', $value );
+ }
+ if ( $value >= -0x80 ) {
+ // int8
+ return pack( 'Cc', 0xD0, $value );
+ }
+ if ( $value >= -0x8000 ) {
+ // int16
+ $p = pack( 's', $value );
+ return self::$bigendian
+ ? pack( 'Ca2', 0xD1, $p )
+ : pack( 'Ca2', 0xD1, strrev( $p ) );
+ }
+ if ( $value >= -0x80000000 ) {
+ // int32
+ $p = pack( 'l', $value );
+ return self::$bigendian
+ ? pack( 'Ca4', 0xD2, $p )
+ : pack( 'Ca4', 0xD2, strrev( $p ) );
+ }
+ if ( $value >= -0x8000000000000000 ) {
+ // int64
+ // pack() does not support 64-bit ints either so pack into two 32-bits
+ $p1 = pack( 'l', $value & 0xFFFFFFFF );
+ $p2 = pack( 'l', ( $value >> 32 ) & 0xFFFFFFFF );
+ return self::$bigendian
+ ? pack( 'Ca4a4', 0xD3, $p1, $p2 )
+ : pack( 'Ca4a4', 0xD3, strrev( $p2 ), strrev( $p1 ) );
+ }
+ }
+ throw new InvalidArgumentException( __METHOD__ . ": invalid integer '$value'" );
+
+ case 'array':
+ $buffer = '';
+ $length = count( $value );
+ if ( $length > 0xFFFFFFFF ) {
+ throw new InvalidArgumentException( __METHOD__
+ . ": array too long (length: $length, max: 4294967295)" );
+ }
+
+ $index = 0;
+ foreach ( $value as $k => $v ) {
+ if ( $index !== $k || $index === $length ) {
+ break;
+ } else {
+ $index++;
+ }
+ }
+ $associative = $index !== $length;
+
+ if ( $associative ) {
+ if ( $length < 16 ) {
+ $buffer .= pack( 'C', 0x80 | $length );
+ } elseif ( $length <= 0xFFFF ) {
+ $buffer .= pack( 'Cn', 0xDE, $length );
+ } else {
+ $buffer .= pack( 'CN', 0xDF, $length );
+ }
+ foreach ( $value as $k => $v ) {
+ $buffer .= self::pack( $k );
+ $buffer .= self::pack( $v );
+ }
+ } else {
+ if ( $length < 16 ) {
+ $buffer .= pack( 'C', 0x90 | $length );
+ } elseif ( $length <= 0xFFFF ) {
+ $buffer .= pack( 'Cn', 0xDC, $length );
+ } else {
+ $buffer .= pack( 'CN', 0xDD, $length );
+ }
+ foreach ( $value as $v ) {
+ $buffer .= self::pack( $v );
+ }
+ }
+ return $buffer;
+
+ default:
+ throw new InvalidArgumentException( __METHOD__ . ': unsupported type ' . gettype( $value ) );
+ }
+ }
+}
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