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1 <?php |
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2 /** |
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3 * Classes, which help reading streams of data from files. |
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4 * Based on the classes from Danilo Segan <danilo@kvota.net> |
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5 * |
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6 * @version $Id: streams.php 293 2009-11-12 15:43:50Z nbachiyski $ |
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7 * @package pomo |
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8 * @subpackage streams |
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9 */ |
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10 |
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11 if ( !class_exists( 'POMO_Reader' ) ): |
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12 class POMO_Reader { |
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13 |
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14 var $endian = 'little'; |
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15 var $_post = ''; |
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16 |
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17 function POMO_Reader() { |
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18 $this->is_overloaded = ((ini_get("mbstring.func_overload") & 2) != 0) && function_exists('mb_substr'); |
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19 $this->_pos = 0; |
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20 } |
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21 |
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22 /** |
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23 * Sets the endianness of the file. |
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24 * |
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25 * @param $endian string 'big' or 'little' |
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26 */ |
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27 function setEndian($endian) { |
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28 $this->endian = $endian; |
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29 } |
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30 |
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31 /** |
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32 * Reads a 32bit Integer from the Stream |
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33 * |
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34 * @return mixed The integer, corresponding to the next 32 bits from |
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35 * the stream of false if there are not enough bytes or on error |
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36 */ |
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37 function readint32() { |
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38 $bytes = $this->read(4); |
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39 if (4 != $this->strlen($bytes)) |
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40 return false; |
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41 $endian_letter = ('big' == $this->endian)? 'N' : 'V'; |
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42 $int = unpack($endian_letter, $bytes); |
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43 return array_shift($int); |
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44 } |
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45 |
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46 /** |
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47 * Reads an array of 32-bit Integers from the Stream |
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48 * |
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49 * @param integer count How many elements should be read |
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50 * @return mixed Array of integers or false if there isn't |
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51 * enough data or on error |
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52 */ |
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53 function readint32array($count) { |
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54 $bytes = $this->read(4 * $count); |
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55 if (4*$count != $this->strlen($bytes)) |
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56 return false; |
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57 $endian_letter = ('big' == $this->endian)? 'N' : 'V'; |
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58 return unpack($endian_letter.$count, $bytes); |
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59 } |
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60 |
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61 |
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62 function substr($string, $start, $length) { |
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63 if ($this->is_overloaded) { |
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64 return mb_substr($string, $start, $length, 'ascii'); |
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65 } else { |
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66 return substr($string, $start, $length); |
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67 } |
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68 } |
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69 |
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70 function strlen($string) { |
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71 if ($this->is_overloaded) { |
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72 return mb_strlen($string, 'ascii'); |
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73 } else { |
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74 return strlen($string); |
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75 } |
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76 } |
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77 |
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78 function str_split($string, $chunk_size) { |
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79 if (!function_exists('str_split')) { |
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80 $length = $this->strlen($string); |
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81 $out = array(); |
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82 for ($i = 0; $i < $length; $i += $chunk_size) |
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83 $out[] = $this->substr($string, $i, $chunk_size); |
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84 return $out; |
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85 } else { |
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86 return str_split( $string, $chunk_size ); |
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87 } |
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88 } |
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89 |
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90 |
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91 function pos() { |
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92 return $this->_pos; |
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93 } |
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94 |
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95 function is_resource() { |
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96 return true; |
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97 } |
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98 |
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99 function close() { |
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100 return true; |
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101 } |
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102 } |
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103 endif; |
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104 |
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105 if ( !class_exists( 'POMO_FileReader' ) ): |
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106 class POMO_FileReader extends POMO_Reader { |
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107 function POMO_FileReader($filename) { |
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108 parent::POMO_Reader(); |
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109 $this->_f = fopen($filename, 'r'); |
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110 } |
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111 |
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112 function read($bytes) { |
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113 return fread($this->_f, $bytes); |
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114 } |
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115 |
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116 function seekto($pos) { |
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117 if ( -1 == fseek($this->_f, $pos, SEEK_SET)) { |
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118 return false; |
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119 } |
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120 $this->_pos = $pos; |
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121 return true; |
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122 } |
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123 |
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124 function is_resource() { |
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125 return is_resource($this->_f); |
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126 } |
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127 |
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128 function feof() { |
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129 return feof($this->_f); |
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130 } |
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131 |
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132 function close() { |
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133 return fclose($this->_f); |
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134 } |
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135 |
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136 function read_all() { |
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137 $all = ''; |
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138 while ( !$this->feof() ) |
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139 $all .= $this->read(4096); |
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140 return $all; |
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141 } |
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142 } |
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143 endif; |
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144 |
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145 if ( !class_exists( 'POMO_StringReader' ) ): |
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146 /** |
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147 * Provides file-like methods for manipulating a string instead |
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148 * of a physical file. |
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149 */ |
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150 class POMO_StringReader extends POMO_Reader { |
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151 |
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152 var $_str = ''; |
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153 |
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154 function POMO_StringReader($str = '') { |
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155 parent::POMO_Reader(); |
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156 $this->_str = $str; |
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157 $this->_pos = 0; |
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158 } |
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159 |
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160 |
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161 function read($bytes) { |
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162 $data = $this->substr($this->_str, $this->_pos, $bytes); |
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163 $this->_pos += $bytes; |
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164 if ($this->strlen($this->_str) < $this->_pos) $this->_pos = $this->strlen($this->_str); |
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165 return $data; |
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166 } |
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167 |
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168 function seekto($pos) { |
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169 $this->_pos = $pos; |
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170 if ($this->strlen($this->_str) < $this->_pos) $this->_pos = $this->strlen($this->_str); |
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171 return $this->_pos; |
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172 } |
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173 |
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174 function length() { |
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175 return $this->strlen($this->_str); |
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176 } |
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177 |
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178 function read_all() { |
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179 return $this->substr($this->_str, $this->_pos, $this->strlen($this->_str)); |
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180 } |
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181 |
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182 } |
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183 endif; |
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184 |
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185 if ( !class_exists( 'POMO_CachedFileReader' ) ): |
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186 /** |
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187 * Reads the contents of the file in the beginning. |
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188 */ |
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189 class POMO_CachedFileReader extends POMO_StringReader { |
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190 function POMO_CachedFileReader($filename) { |
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191 parent::POMO_StringReader(); |
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192 $this->_str = file_get_contents($filename); |
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193 if (false === $this->_str) |
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194 return false; |
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195 $this->_pos = 0; |
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196 } |
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197 } |
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198 endif; |
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199 |
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200 if ( !class_exists( 'POMO_CachedIntFileReader' ) ): |
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201 /** |
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202 * Reads the contents of the file in the beginning. |
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203 */ |
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204 class POMO_CachedIntFileReader extends POMO_CachedFileReader { |
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205 function POMO_CachedIntFileReader($filename) { |
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206 parent::POMO_CachedFileReader($filename); |
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207 } |
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208 } |
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209 endif; |