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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 718 2012-10-31 00:32:02Z nbachiyski $
* @package pomo
* @subpackage streams
*/
if ( !class_exists( 'POMO_Reader' ) ):
class POMO_Reader {
var $endian = 'little';
var $_post = '';
function POMO_Reader() {
$this->is_overloaded = ((ini_get("mbstring.func_overload") & 2) != 0) && function_exists('mb_substr');
$this->_pos = 0;
}
/**
* Sets the endianness of the file.
*
* @param $endian string 'big' or 'little'
*/
function setEndian($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 );
}
}
function pos() {
return $this->_pos;
}
function is_resource() {
return true;
}
function close() {
return true;
}
}
endif;
if ( !class_exists( 'POMO_FileReader' ) ):
class POMO_FileReader extends POMO_Reader {
/**
* @param string $filename
*/
function POMO_FileReader($filename) {
parent::POMO_Reader();
$this->_f = fopen($filename, 'rb');
}
/**
* @param int $bytes
*/
function read($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 = $pos;
return true;
}
function is_resource() {
return is_resource($this->_f);
}
function feof() {
return feof($this->_f);
}
function close() {
return fclose($this->_f);
}
function read_all() {
$all = '';
while ( !$this->feof() )
$all .= $this->read(4096);
return $all;
}
}
endif;
if ( !class_exists( 'POMO_StringReader' ) ):
/**
* Provides file-like methods for manipulating a string instead
* of a physical file.
*/
class POMO_StringReader extends POMO_Reader {
var $_str = '';
function POMO_StringReader($str = '') {
parent::POMO_Reader();
$this->_str = $str;
$this->_pos = 0;
}
/**
* @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;
}
function length() {
return $this->strlen($this->_str);
}
function read_all() {
return $this->substr($this->_str, $this->_pos, $this->strlen($this->_str));
}
}
endif;
if ( !class_exists( 'POMO_CachedFileReader' ) ):
/**
* Reads the contents of the file in the beginning.
*/
class POMO_CachedFileReader extends POMO_StringReader {
function POMO_CachedFileReader($filename) {
parent::POMO_StringReader();
$this->_str = file_get_contents($filename);
if (false === $this->_str)
return false;
$this->_pos = 0;
}
}
endif;
if ( !class_exists( 'POMO_CachedIntFileReader' ) ):
/**
* Reads the contents of the file in the beginning.
*/
class POMO_CachedIntFileReader extends POMO_CachedFileReader {
function POMO_CachedIntFileReader($filename) {
parent::POMO_CachedFileReader($filename);
}
}
endif;
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