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<?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 boolean|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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