1 <?php |
1 <?php |
2 /** |
2 /** |
3 * Classes, which help reading streams of data from files. |
3 * Classes, which help reading streams of data from files. |
4 * Based on the classes from Danilo Segan <danilo@kvota.net> |
4 * Based on the classes from Danilo Segan <danilo@kvota.net> |
5 * |
5 * |
6 * @version $Id: streams.php 138 2009-06-23 13:22:09Z nbachiyski $ |
6 * @version $Id: streams.php 293 2009-11-12 15:43:50Z nbachiyski $ |
7 * @package pomo |
7 * @package pomo |
8 * @subpackage streams |
8 * @subpackage streams |
9 */ |
9 */ |
10 |
10 |
11 |
11 if ( !class_exists( 'POMO_Reader' ) ): |
12 /** |
12 class POMO_Reader { |
13 * Provides file-like methods for manipulating a string instead |
13 |
14 * of a physical file. |
14 var $endian = 'little'; |
15 */ |
15 var $_post = ''; |
16 class POMO_StringReader { |
16 |
17 var $_pos; |
17 function POMO_Reader() { |
18 var $_str; |
18 $this->is_overloaded = ((ini_get("mbstring.func_overload") & 2) != 0) && function_exists('mb_substr'); |
19 |
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20 function POMO_StringReader($str = '') { |
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21 $this->_str = $str; |
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22 $this->_pos = 0; |
19 $this->_pos = 0; |
23 $this->is_overloaded = ((ini_get("mbstring.func_overload") & 2) != 0) && function_exists('mb_substr'); |
20 } |
24 } |
21 |
25 |
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26 function _substr($string, $start, $length) { |
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27 if ($this->is_overloaded) { |
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28 return mb_substr($string,$start,$length,'ascii'); |
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29 } else { |
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30 return substr($string,$start,$length); |
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31 } |
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32 } |
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33 |
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34 function _strlen($string) { |
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35 if ($this->is_overloaded) { |
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36 return mb_strlen($string,'ascii'); |
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37 } else { |
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38 return strlen($string); |
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39 } |
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40 } |
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41 |
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42 function read($bytes) { |
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43 $data = $this->_substr($this->_str, $this->_pos, $bytes); |
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44 $this->_pos += $bytes; |
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45 if ($this->_strlen($this->_str) < $this->_pos) $this->_pos = $this->_strlen($this->_str); |
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46 return $data; |
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47 } |
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48 |
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49 function seekto($pos) { |
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50 $this->_pos = $pos; |
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51 if ($this->_strlen($this->_str) < $this->_pos) $this->_pos = $this->_strlen($this->_str); |
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52 return $this->_pos; |
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53 } |
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54 |
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55 function pos() { |
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56 return $this->_pos; |
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57 } |
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58 |
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59 function length() { |
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60 return $this->_strlen($this->_str); |
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61 } |
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62 |
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63 } |
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64 |
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65 /** |
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66 * Reads the contents of the file in the beginning. |
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67 */ |
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68 class POMO_CachedFileReader extends POMO_StringReader { |
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69 function POMO_CachedFileReader($filename) { |
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70 parent::POMO_StringReader(); |
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71 $this->_str = file_get_contents($filename); |
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72 if (false === $this->_str) |
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73 return false; |
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74 $this->_pos = 0; |
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75 } |
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76 } |
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77 |
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78 /** |
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79 * Allows reading integers from a file. |
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80 */ |
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81 class POMO_CachedIntFileReader extends POMO_CachedFileReader { |
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82 |
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83 var $endian = 'little'; |
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84 |
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85 /** |
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86 * Opens a file and caches it. |
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87 * |
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88 * @param $filename string name of the file to be opened |
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89 * @param $endian string endianness of the words in the file, allowed |
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90 * values are 'little' or 'big'. Default value is 'little' |
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91 */ |
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92 function POMO_CachedIntFileReader($filename, $endian = 'little') { |
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93 $this->endian = $endian; |
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94 parent::POMO_CachedFileReader($filename); |
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95 } |
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96 |
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97 /** |
22 /** |
98 * Sets the endianness of the file. |
23 * Sets the endianness of the file. |
99 * |
24 * |
100 * @param $endian string 'big' or 'little' |
25 * @param $endian string 'big' or 'little' |
101 */ |
26 */ |
109 * @return mixed The integer, corresponding to the next 32 bits from |
34 * @return mixed The integer, corresponding to the next 32 bits from |
110 * the stream of false if there are not enough bytes or on error |
35 * the stream of false if there are not enough bytes or on error |
111 */ |
36 */ |
112 function readint32() { |
37 function readint32() { |
113 $bytes = $this->read(4); |
38 $bytes = $this->read(4); |
114 if (4 != $this->_strlen($bytes)) |
39 if (4 != $this->strlen($bytes)) |
115 return false; |
40 return false; |
116 $endian_letter = ('big' == $this->endian)? 'N' : 'V'; |
41 $endian_letter = ('big' == $this->endian)? 'N' : 'V'; |
117 $int = unpack($endian_letter, $bytes); |
42 $int = unpack($endian_letter, $bytes); |
118 return array_shift($int); |
43 return array_shift($int); |
119 } |
44 } |
125 * @return mixed Array of integers or false if there isn't |
50 * @return mixed Array of integers or false if there isn't |
126 * enough data or on error |
51 * enough data or on error |
127 */ |
52 */ |
128 function readint32array($count) { |
53 function readint32array($count) { |
129 $bytes = $this->read(4 * $count); |
54 $bytes = $this->read(4 * $count); |
130 if (4*$count != $this->_strlen($bytes)) |
55 if (4*$count != $this->strlen($bytes)) |
131 return false; |
56 return false; |
132 $endian_letter = ('big' == $this->endian)? 'N' : 'V'; |
57 $endian_letter = ('big' == $this->endian)? 'N' : 'V'; |
133 return unpack($endian_letter.$count, $bytes); |
58 return unpack($endian_letter.$count, $bytes); |
134 } |
59 } |
135 } |
60 |
136 |
61 |
137 ?> |
62 function substr($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. |
|
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; |