MediaWiki  1.28.0
MWMessagePack.php
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1 <?php
35 class MWMessagePack {
37  public static $bigendian = null;
38 
50  public static function pack( $value ) {
51  if ( self::$bigendian === null ) {
52  self::$bigendian = pack( 'S', 1 ) === pack( 'n', 1 );
53  }
54 
55  switch ( gettype( $value ) ) {
56  case 'NULL':
57  return "\xC0";
58 
59  case 'boolean':
60  return $value ? "\xC3" : "\xC2";
61 
62  case 'double':
63  case 'float':
64  return self::$bigendian
65  ? "\xCB" . pack( 'd', $value )
66  : "\xCB" . strrev( pack( 'd', $value ) );
67 
68  case 'string':
69  $length = strlen( $value );
70  if ( $length < 32 ) {
71  return pack( 'Ca*', 0xA0 | $length, $value );
72  } elseif ( $length <= 0xFFFF ) {
73  return pack( 'Cna*', 0xDA, $length, $value );
74  } elseif ( $length <= 0xFFFFFFFF ) {
75  return pack( 'CNa*', 0xDB, $length, $value );
76  }
77  throw new InvalidArgumentException( __METHOD__
78  . ": string too long (length: $length; max: 4294967295)" );
79 
80  case 'integer':
81  if ( $value >= 0 ) {
82  if ( $value <= 0x7F ) {
83  // positive fixnum
84  return chr( $value );
85  }
86  if ( $value <= 0xFF ) {
87  // uint8
88  return pack( 'CC', 0xCC, $value );
89  }
90  if ( $value <= 0xFFFF ) {
91  // uint16
92  return pack( 'Cn', 0xCD, $value );
93  }
94  if ( $value <= 0xFFFFFFFF ) {
95  // uint32
96  return pack( 'CN', 0xCE, $value );
97  }
98  if ( $value <= 0xFFFFFFFFFFFFFFFF ) {
99  // uint64
100  $hi = ( $value & 0xFFFFFFFF00000000 ) >> 32;
101  $lo = $value & 0xFFFFFFFF;
102  return self::$bigendian
103  ? pack( 'CNN', 0xCF, $lo, $hi )
104  : pack( 'CNN', 0xCF, $hi, $lo );
105  }
106  } else {
107  if ( $value >= -32 ) {
108  // negative fixnum
109  return pack( 'c', $value );
110  }
111  if ( $value >= -0x80 ) {
112  // int8
113  return pack( 'Cc', 0xD0, $value );
114  }
115  if ( $value >= -0x8000 ) {
116  // int16
117  $p = pack( 's', $value );
118  return self::$bigendian
119  ? pack( 'Ca2', 0xD1, $p )
120  : pack( 'Ca2', 0xD1, strrev( $p ) );
121  }
122  if ( $value >= -0x80000000 ) {
123  // int32
124  $p = pack( 'l', $value );
125  return self::$bigendian
126  ? pack( 'Ca4', 0xD2, $p )
127  : pack( 'Ca4', 0xD2, strrev( $p ) );
128  }
129  if ( $value >= -0x8000000000000000 ) {
130  // int64
131  // pack() does not support 64-bit ints either so pack into two 32-bits
132  $p1 = pack( 'l', $value & 0xFFFFFFFF );
133  $p2 = pack( 'l', ( $value >> 32 ) & 0xFFFFFFFF );
134  return self::$bigendian
135  ? pack( 'Ca4a4', 0xD3, $p1, $p2 )
136  : pack( 'Ca4a4', 0xD3, strrev( $p2 ), strrev( $p1 ) );
137  }
138  }
139  throw new InvalidArgumentException( __METHOD__ . ": invalid integer '$value'" );
140 
141  case 'array':
142  $buffer = '';
143  $length = count( $value );
144  if ( $length > 0xFFFFFFFF ) {
145  throw new InvalidArgumentException( __METHOD__
146  . ": array too long (length: $length, max: 4294967295)" );
147  }
148 
149  $index = 0;
150  foreach ( $value as $k => $v ) {
151  if ( $index !== $k || $index === $length ) {
152  break;
153  } else {
154  $index++;
155  }
156  }
157  $associative = $index !== $length;
158 
159  if ( $associative ) {
160  if ( $length < 16 ) {
161  $buffer .= pack( 'C', 0x80 | $length );
162  } elseif ( $length <= 0xFFFF ) {
163  $buffer .= pack( 'Cn', 0xDE, $length );
164  } else {
165  $buffer .= pack( 'CN', 0xDF, $length );
166  }
167  foreach ( $value as $k => $v ) {
168  $buffer .= self::pack( $k );
169  $buffer .= self::pack( $v );
170  }
171  } else {
172  if ( $length < 16 ) {
173  $buffer .= pack( 'C', 0x90 | $length );
174  } elseif ( $length <= 0xFFFF ) {
175  $buffer .= pack( 'Cn', 0xDC, $length );
176  } else {
177  $buffer .= pack( 'CN', 0xDD, $length );
178  }
179  foreach ( $value as $v ) {
180  $buffer .= self::pack( $v );
181  }
182  }
183  return $buffer;
184 
185  default:
186  throw new InvalidArgumentException( __METHOD__ . ': unsupported type ' . gettype( $value ) );
187  }
188  }
189 }
$value
$value
Definition: styleTest.css.php:45
MWMessagePack\$bigendian
static bool null $bigendian
Whether current system is bigendian.
Definition: MWMessagePack.php:37
$buffer
$buffer
Definition: mwdoc-filter.php:48
as
This document is intended to provide useful advice for parties seeking to redistribute MediaWiki to end users It s targeted particularly at maintainers for Linux since it s been observed that distribution packages of MediaWiki often break We ve consistently had to recommend that users seeking support use official tarballs instead of their distribution s and this often solves whatever problem the user is having It would be nice if this could such as
Definition: distributors.txt:9
php
injection txt This is an overview of how MediaWiki makes use of dependency injection The design described here grew from the discussion of RFC T384 The term dependency this means that anything an object needs to operate should be injected from the the object itself should only know narrow no concrete implementation of the logic it relies on The requirement to inject everything typically results in an architecture that based on two main types of and essentially stateless service objects that use other service objects to operate on the value objects As of the beginning MediaWiki is only starting to use the DI approach Much of the code still relies on global state or direct resulting in a highly cyclical dependency which acts as the top level factory for services in MediaWiki which can be used to gain access to default instances of various services MediaWikiServices however also allows new services to be defined and default services to be redefined Services are defined or redefined by providing a callback the instantiator that will return a new instance of the service When it will create an instance of MediaWikiServices and populate it with the services defined in the files listed by thereby bootstrapping the DI framework Per $wgServiceWiringFiles lists includes ServiceWiring php
Definition: injection.txt:35
MWMessagePack\pack
static pack($value)
Encode a value using MessagePack.
Definition: MWMessagePack.php:50