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Fixes #34748 Built from https://develop.svn.wordpress.org/trunk@35714 git-svn-id: http://core.svn.wordpress.org/trunk@35678 1a063a9b-81f0-0310-95a4-ce76da25c4cd
316 lines
5.8 KiB
PHP
316 lines
5.8 KiB
PHP
<?php
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/**
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* Classes, which help reading streams of data from files.
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* Based on the classes from Danilo Segan <danilo@kvota.net>
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*
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* @version $Id: streams.php 1157 2015-11-20 04:30:11Z dd32 $
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* @package pomo
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* @subpackage streams
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*/
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if ( ! class_exists( 'POMO_Reader', false ) ):
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class POMO_Reader {
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var $endian = 'little';
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var $_post = '';
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/**
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* PHP5 constructor.
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*/
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function __construct() {
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$this->is_overloaded = ((ini_get("mbstring.func_overload") & 2) != 0) && function_exists('mb_substr');
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$this->_pos = 0;
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}
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/**
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* PHP4 constructor.
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*/
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public function POMO_Reader() {
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self::__construct();
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}
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/**
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* Sets the endianness of the file.
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*
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* @param $endian string 'big' or 'little'
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*/
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function setEndian($endian) {
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$this->endian = $endian;
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}
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/**
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* Reads a 32bit Integer from the Stream
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*
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* @return mixed The integer, corresponding to the next 32 bits from
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* the stream of false if there are not enough bytes or on error
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*/
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function readint32() {
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$bytes = $this->read(4);
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if (4 != $this->strlen($bytes))
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return false;
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$endian_letter = ('big' == $this->endian)? 'N' : 'V';
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$int = unpack($endian_letter, $bytes);
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return reset( $int );
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}
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/**
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* Reads an array of 32-bit Integers from the Stream
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*
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* @param integer count How many elements should be read
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* @return mixed Array of integers or false if there isn't
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* enough data or on error
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*/
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function readint32array($count) {
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$bytes = $this->read(4 * $count);
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if (4*$count != $this->strlen($bytes))
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return false;
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$endian_letter = ('big' == $this->endian)? 'N' : 'V';
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return unpack($endian_letter.$count, $bytes);
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}
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/**
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* @param string $string
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* @param int $start
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* @param int $length
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* @return string
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*/
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function substr($string, $start, $length) {
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if ($this->is_overloaded) {
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return mb_substr($string, $start, $length, 'ascii');
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} else {
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return substr($string, $start, $length);
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}
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}
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/**
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* @param string $string
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* @return int
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*/
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function strlen($string) {
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if ($this->is_overloaded) {
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return mb_strlen($string, 'ascii');
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} else {
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return strlen($string);
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}
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}
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/**
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* @param string $string
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* @param int $chunk_size
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* @return array
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*/
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function str_split($string, $chunk_size) {
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if (!function_exists('str_split')) {
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$length = $this->strlen($string);
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$out = array();
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for ($i = 0; $i < $length; $i += $chunk_size)
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$out[] = $this->substr($string, $i, $chunk_size);
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return $out;
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} else {
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return str_split( $string, $chunk_size );
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}
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}
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/**
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* @return int
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*/
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function pos() {
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return $this->_pos;
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}
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/**
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* @return true
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*/
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function is_resource() {
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return true;
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}
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/**
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* @return true
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*/
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function close() {
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return true;
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}
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}
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endif;
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if ( ! class_exists( 'POMO_FileReader', false ) ):
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class POMO_FileReader extends POMO_Reader {
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/**
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* @param string $filename
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*/
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function __construct( $filename ) {
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parent::POMO_Reader();
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$this->_f = fopen($filename, 'rb');
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}
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/**
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* PHP4 constructor.
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*/
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public function POMO_FileReader( $filename ) {
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self::__construct( $filename );
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}
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/**
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* @param int $bytes
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*/
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function read($bytes) {
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return fread($this->_f, $bytes);
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}
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/**
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* @param int $pos
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* @return boolean
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*/
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function seekto($pos) {
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if ( -1 == fseek($this->_f, $pos, SEEK_SET)) {
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return false;
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}
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$this->_pos = $pos;
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return true;
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}
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/**
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* @return bool
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*/
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function is_resource() {
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return is_resource($this->_f);
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}
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/**
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* @return bool
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*/
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function feof() {
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return feof($this->_f);
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}
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/**
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* @return bool
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*/
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function close() {
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return fclose($this->_f);
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}
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/**
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* @return string
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*/
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function read_all() {
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$all = '';
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while ( !$this->feof() )
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$all .= $this->read(4096);
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return $all;
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}
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}
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endif;
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if ( ! class_exists( 'POMO_StringReader', false ) ):
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/**
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* Provides file-like methods for manipulating a string instead
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* of a physical file.
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*/
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class POMO_StringReader extends POMO_Reader {
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var $_str = '';
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/**
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* PHP5 constructor.
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*/
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function __construct( $str = '' ) {
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parent::POMO_Reader();
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$this->_str = $str;
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$this->_pos = 0;
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}
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/**
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* PHP4 constructor.
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*/
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public function POMO_StringReader( $str = '' ) {
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self::__construct( $str );
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}
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/**
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* @param string $bytes
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* @return string
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*/
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function read($bytes) {
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$data = $this->substr($this->_str, $this->_pos, $bytes);
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$this->_pos += $bytes;
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if ($this->strlen($this->_str) < $this->_pos) $this->_pos = $this->strlen($this->_str);
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return $data;
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}
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/**
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* @param int $pos
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* @return int
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*/
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function seekto($pos) {
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$this->_pos = $pos;
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if ($this->strlen($this->_str) < $this->_pos) $this->_pos = $this->strlen($this->_str);
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return $this->_pos;
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}
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/**
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* @return int
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*/
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function length() {
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return $this->strlen($this->_str);
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}
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/**
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* @return string
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*/
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function read_all() {
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return $this->substr($this->_str, $this->_pos, $this->strlen($this->_str));
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}
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}
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endif;
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if ( ! class_exists( 'POMO_CachedFileReader', false ) ):
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/**
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* Reads the contents of the file in the beginning.
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*/
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class POMO_CachedFileReader extends POMO_StringReader {
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/**
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* PHP5 constructor.
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*/
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function __construct( $filename ) {
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parent::POMO_StringReader();
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$this->_str = file_get_contents($filename);
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if (false === $this->_str)
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return false;
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$this->_pos = 0;
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}
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/**
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* PHP4 constructor.
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*/
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public function POMO_CachedFileReader( $filename ) {
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self::__construct( $filename );
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}
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}
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endif;
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if ( ! class_exists( 'POMO_CachedIntFileReader', false ) ):
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/**
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* Reads the contents of the file in the beginning.
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*/
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class POMO_CachedIntFileReader extends POMO_CachedFileReader {
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/**
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* PHP5 constructor.
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*/
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public function __construct( $filename ) {
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parent::POMO_CachedFileReader($filename);
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}
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/**
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* PHP4 constructor.
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*/
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function POMO_CachedIntFileReader( $filename ) {
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self::__construct( $filename );
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}
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}
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endif;
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