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; |