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