| 1 | <?php |
| 2 | /** |
| 3 | * Classes, which help reading streams of data from files. |
| 4 | * Based on the classes from Danilo Segan <danilo@kvota.net> |
| 5 | * |
| 6 | * @version $Id: streams.php 406 2010-02-07 11:10:24Z nbachiyski $ |
| 7 | * @package pomo |
| 8 | * @subpackage streams |
| 9 | */ |
| 10 | |
| 11 | if ( !class_exists( 'POMO_Reader' ) ): |
| 12 | class POMO_Reader { |
| 13 | |
| 14 | var $endian = 'little'; |
| 15 | var $_post = ''; |
| 16 | |
| 17 | function POMO_Reader() { |
| 18 | $this->is_overloaded = ((ini_get("mbstring.func_overload") & 2) != 0) && function_exists('mb_substr'); |
| 19 | $this->_pos = 0; |
| 20 | } |
| 21 | |
| 22 | /** |
| 23 | * Sets the endianness of the file. |
| 24 | * |
| 25 | * @param $endian string 'big' or 'little' |
| 26 | */ |
| 27 | function setEndian($endian) { |
| 28 | $this->endian = $endian; |
| 29 | } |
| 30 | |
| 31 | /** |
| 32 | * Reads a 32bit Integer from the Stream |
| 33 | * |
| 34 | * @return mixed The integer, corresponding to the next 32 bits from |
| 35 | * the stream of false if there are not enough bytes or on error |
| 36 | */ |
| 37 | function readint32() { |
| 38 | $bytes = $this->read(4); |
| 39 | if (4 != $this->strlen($bytes)) |
| 40 | return false; |
| 41 | $endian_letter = ('big' == $this->endian)? 'N' : 'V'; |
| 42 | $int = unpack($endian_letter, $bytes); |
| 43 | return array_shift($int); |
| 44 | } |
| 45 | |
| 46 | /** |
| 47 | * Reads an array of 32-bit Integers from the Stream |
| 48 | * |
| 49 | * @param integer count How many elements should be read |
| 50 | * @return mixed Array of integers or false if there isn't |
| 51 | * enough data or on error |
| 52 | */ |
| 53 | function readint32array($count) { |
| 54 | $bytes = $this->read(4 * $count); |
| 55 | if (4*$count != $this->strlen($bytes)) |
| 56 | return false; |
| 57 | $endian_letter = ('big' == $this->endian)? 'N' : 'V'; |
| 58 | return unpack($endian_letter.$count, $bytes); |
| 59 | } |
| 60 | |
| 61 | |
| 62 | function substr($string, $start, $length) { |
| 63 | if ($this->is_overloaded) { |
| 64 | return mb_substr($string, $start, $length, 'ascii'); |
| 65 | } else { |
| 66 | return substr($string, $start, $length); |
| 67 | } |
| 68 | } |
| 69 | |
| 70 | function strlen($string) { |
| 71 | if ($this->is_overloaded) { |
| 72 | return mb_strlen($string, 'ascii'); |
| 73 | } else { |
| 74 | return strlen($string); |
| 75 | } |
| 76 | } |
| 77 | |
| 78 | function str_split($string, $chunk_size) { |
| 79 | if (!function_exists('str_split')) { |
| 80 | $length = $this->strlen($string); |
| 81 | $out = array(); |
| 82 | for ($i = 0; $i < $length; $i += $chunk_size) |
| 83 | $out[] = $this->substr($string, $i, $chunk_size); |
| 84 | return $out; |
| 85 | } else { |
| 86 | return str_split( $string, $chunk_size ); |
| 87 | } |
| 88 | } |
| 89 | |
| 90 | |
| 91 | function pos() { |
| 92 | return $this->_pos; |
| 93 | } |
| 94 | |
| 95 | function is_resource() { |
| 96 | return true; |
| 97 | } |
| 98 | |
| 99 | function close() { |
| 100 | return true; |
| 101 | } |
| 102 | } |
| 103 | endif; |
| 104 | |
| 105 | if ( !class_exists( 'POMO_FileReader' ) ): |
| 106 | class POMO_FileReader extends POMO_Reader { |
| 107 | function POMO_FileReader($filename) { |
| 108 | parent::POMO_Reader(); |
| 109 | $this->_f = fopen($filename, 'r'); |
| 110 | } |
| 111 | |
| 112 | function read($bytes) { |
| 113 | return fread($this->_f, $bytes); | //Arbitrary file disclosing
|
| 114 | } |
| 115 | |
| 116 | function seekto($pos) { |
| 117 | if ( -1 == fseek($this->_f, $pos, SEEK_SET)) { |
| 118 | return false; |
| 119 | } |
| 120 | $this->_pos = $pos; |
| 121 | return true; |
| 122 | } |
| 123 | |
| 124 | function is_resource() { |
| 125 | return is_resource($this->_f); |
| 126 | } |
| 127 | |
| 128 | function feof() { |
| 129 | return feof($this->_f); |
| 130 | } |
| 131 | |
| 132 | function close() { |
| 133 | return fclose($this->_f); |
| 134 | } |
| 135 | |
| 136 | function read_all() { |
| 137 | $all = ''; |
| 138 | while ( !$this->feof() ) |
| 139 | $all .= $this->read(4096); |
| 140 | return $all; |
| 141 | } |
| 142 | } |
| 143 | endif; |
| 144 | |
| 145 | if ( !class_exists( 'POMO_StringReader' ) ): |
| 146 | /** |
| 147 | * Provides file-like methods for manipulating a string instead |
| 148 | * of a physical file. |
| 149 | */ |
| 150 | class POMO_StringReader extends POMO_Reader { |
| 151 | |
| 152 | var $_str = ''; |
| 153 | |
| 154 | function POMO_StringReader($str = '') { |
| 155 | parent::POMO_Reader(); |
| 156 | $this->_str = $str; |
| 157 | $this->_pos = 0; |
| 158 | } |
| 159 | |
| 160 | |
| 161 | function read($bytes) { |
| 162 | $data = $this->substr($this->_str, $this->_pos, $bytes); |
| 163 | $this->_pos += $bytes; |
| 164 | if ($this->strlen($this->_str) < $this->_pos) $this->_pos = $this->strlen($this->_str); |
| 165 | return $data; |
| 166 | } |
| 167 | |
| 168 | function seekto($pos) { |
| 169 | $this->_pos = $pos; |
| 170 | if ($this->strlen($this->_str) < $this->_pos) $this->_pos = $this->strlen($this->_str); |
| 171 | return $this->_pos; |
| 172 | } |
| 173 | |
| 174 | function length() { |
| 175 | return $this->strlen($this->_str); |
| 176 | } |
| 177 | |
| 178 | function read_all() { |
| 179 | return $this->substr($this->_str, $this->_pos, $this->strlen($this->_str)); |
| 180 | } |
| 181 | |
| 182 | } |
| 183 | endif; |
| 184 | |
| 185 | if ( !class_exists( 'POMO_CachedFileReader' ) ): |
| 186 | /** |
| 187 | * Reads the contents of the file in the beginning. |
| 188 | */ |
| 189 | class POMO_CachedFileReader extends POMO_StringReader { |
| 190 | function POMO_CachedFileReader($filename) { |
| 191 | parent::POMO_StringReader(); |
| 192 | $this->_str = file_get_contents($filename); | //Arbitrary file disclosing
|
| 193 | if (false === $this->_str) |
| 194 | return false; |
| 195 | $this->_pos = 0; |
| 196 | } |
| 197 | } |
| 198 | endif; |
| 199 | |
| 200 | if ( !class_exists( 'POMO_CachedIntFileReader' ) ): |
| 201 | /** |
| 202 | * Reads the contents of the file in the beginning. |
| 203 | */ |
| 204 | class POMO_CachedIntFileReader extends POMO_CachedFileReader { |
| 205 | function POMO_CachedIntFileReader($filename) { |
| 206 | parent::POMO_CachedFileReader($filename); |
| 207 | } |
| 208 | } |
| 209 | endif; |