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Ticket #14207: streams.php

File streams.php, 4.7 KB (added by bueltge, 16 years ago)

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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($bytes) {
113	if ( empty($bytes) )
114	return fread($this->_f, $bytes);
115	else
116	return;
117	}
118
119	function seekto($pos) {
120	if ( -1 == fseek($this->_f, $pos, SEEK_SET)) {
121	return false;
122	}
123	$this->_pos = $pos;
124	return true;
125	}
126
127	function is_resource() {
128	return is_resource($this->_f);
129	}
130
131	function feof() {
132	return feof($this->_f);
133	}
134
135	function close() {
136	return fclose($this->_f);
137	}
138
139	function read_all() {
140	$all = '';
141	while ( !$this->feof() )
142	$all .= $this->read(4096);
143	return $all;
144	}
145	}
146	endif;
147
148	if ( !class_exists( 'POMO_StringReader' ) ):
149	/**
150	* Provides file-like methods for manipulating a string instead
151	* of a physical file.
152	*/
153	class POMO_StringReader extends POMO_Reader {
154
155	var $_str = '';
156
157	function POMO_StringReader($str = '') {
158	parent::POMO_Reader();
159	$this->_str = $str;
160	$this->_pos = 0;
161	}
162
163
164	function read($bytes) {
165	$data = $this->substr($this->_str, $this->_pos, $bytes);
166	$this->_pos += $bytes;
167	if ($this->strlen($this->_str) < $this->_pos) $this->_pos = $this->strlen($this->_str);
168	return $data;
169	}
170
171	function seekto($pos) {
172	$this->_pos = $pos;
173	if ($this->strlen($this->_str) < $this->_pos) $this->_pos = $this->strlen($this->_str);
174	return $this->_pos;
175	}
176
177	function length() {
178	return $this->strlen($this->_str);
179	}
180
181	function read_all() {
182	return $this->substr($this->_str, $this->_pos, $this->strlen($this->_str));
183	}
184
185	}
186	endif;
187
188	if ( !class_exists( 'POMO_CachedFileReader' ) ):
189	/**
190	* Reads the contents of the file in the beginning.
191	*/
192	class POMO_CachedFileReader extends POMO_StringReader {
193	function POMO_CachedFileReader($filename) {
194	parent::POMO_StringReader();
195	$this->_str = file_get_contents($filename);
196	if (false === $this->_str)
197	return false;
198	$this->_pos = 0;
199	}
200	}
201	endif;
202
203	if ( !class_exists( 'POMO_CachedIntFileReader' ) ):
204	/**
205	* Reads the contents of the file in the beginning.
206	*/
207	class POMO_CachedIntFileReader extends POMO_CachedFileReader {
208	function POMO_CachedIntFileReader($filename) {
209	parent::POMO_CachedFileReader($filename);
210	}
211	}
212	endif;

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Ticket #14207: streams.php

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