<?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 ) ) :
#[AllowDynamicProperties]
class POMO_Reader {

public $endian = 'little';
public $_pos;
public $is_overloaded;

/**
* PHP5 constructor.
*/
public function __construct() {
if ( function_exists( 'mb_substr' )
&& ( (int) ini_get( 'mbstring.func_overload' ) & 2 ) // phpcs:ignore PHPCompatibility.IniDirectives.RemovedIniDirectives.mbstring_func_overloadDeprecated
) {
$this->is_overloaded = true;
} else {
$this->is_overloaded = false;
}

$this->_pos = 0;
}

/**
* PHP4 constructor.
*
* @deprecated 5.4.0 Use __construct() instead.
*
* @see POMO_Reader::__construct()
*/
public function POMO_Reader() {
_deprecated_constructor( self::class, '5.4.0', static::class );
self::__construct();
}

/**
* Sets the endianness of the file.
*
* @param string $endian Set the endianness of the file. Accepts 'big', or 'little'.
*/
public function setEndian( $endian ) { // phpcs:ignore WordPress.NamingConventions.ValidFunctionName.MethodNameInvalid
$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
*/
public 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 int $count How many elements should be read
* @return mixed Array of integers or false if there isn't
* enough data or on error
*/
public 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 $input_string
* @param int $start
* @param int $length
* @return string
*/
public function substr( $input_string, $start, $length ) {
if ( $this->is_overloaded ) {
return mb_substr( $input_string, $start, $length, 'ascii' );
} else {
return substr( $input_string, $start, $length );
}
}

/**
* @param string $input_string
* @return int
*/
public function strlen( $input_string ) {
if ( $this->is_overloaded ) {
return mb_strlen( $input_string, 'ascii' );
} else {
return strlen( $input_string );
}
}

/**
* @param string $input_string
* @param int $chunk_size
* @return array
*/
public function str_split( $input_string, $chunk_size ) {
if ( ! function_exists( 'str_split' ) ) {
$length = $this->strlen( $input_string );
$out = array();
for ( $i = 0; $i < $length; $i += $chunk_size ) {
$out[] = $this->substr( $input_string, $i, $chunk_size );
}
return $out;
} else {
return str_split( $input_string, $chunk_size );
}
}

/**
* @return int
*/
public function pos() {
return $this->_pos;
}

/**
* @return true
*/
public function is_resource() {
return true;
}

/**
* @return true
*/
public function close() {
return true;
}
}
endif;

if ( ! class_exists( 'POMO_FileReader', false ) ) :
class POMO_FileReader extends POMO_Reader {

/**
* File pointer resource.
*
* @var resource|false
*/
public $_f;

/**
* @param string $filename
*/
public function __construct( $filename ) {
parent::__construct();
$this->_f = fopen( $filename, 'rb' );
}

/**
* PHP4 constructor.
*
* @deprecated 5.4.0 Use __construct() instead.
*
* @see POMO_FileReader::__construct()
*/
public function POMO_FileReader( $filename ) {
_deprecated_constructor( self::class, '5.4.0', static::class );
self::__construct( $filename );
}

/**
* @param int $bytes
* @return string|false Returns read string, otherwise false.
*/
public function read( $bytes ) {
return fread( $this->_f, $bytes );
}

/**
* @param int $pos
* @return bool
*/
public function seekto( $pos ) {
if ( -1 === fseek( $this->_f, $pos, SEEK_SET ) ) {
return false;
}
$this->_pos = $pos;
return true;
}

/**
* @return bool
*/
public function is_resource() {
return is_resource( $this->_f );
}

/**
* @return bool
*/
public function feof() {
return feof( $this->_f );
}

/**
* @return bool
*/
public function close() {
return fclose( $this->_f );
}

/**
* @return string
*/
public function read_all() {
return stream_get_contents( $this->_f );
}
}
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 {

public $_str = '';

/**
* PHP5 constructor.
*/
public function __construct( $str = '' ) {
parent::__construct();
$this->_str = $str;
$this->_pos = 0;
}

/**
* PHP4 constructor.
*
* @deprecated 5.4.0 Use __construct() instead.
*
* @see POMO_StringReader::__construct()
*/
public function POMO_StringReader( $str = '' ) {
_deprecated_constructor( self::class, '5.4.0', static::class );
self::__construct( $str );
}

/**
* @param string $bytes
* @return string
*/
public 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
*/
public function seekto( $pos ) {
$this->_pos = $pos;
if ( $this->strlen( $this->_str ) < $this->_pos ) {
$this->_pos = $this->strlen( $this->_str );
}
return $this->_pos;
}

/**
* @return int
*/
public function length() {
return $this->strlen( $this->_str );
}

/**
* @return string
*/
public 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.
*/
public function __construct( $filename ) {
parent::__construct();
$this->_str = file_get_contents( $filename );
if ( false === $this->_str ) {
return false;
}
$this->_pos = 0;
}

/**
* PHP4 constructor.
*
* @deprecated 5.4.0 Use __construct() instead.
*
* @see POMO_CachedFileReader::__construct()
*/
public function POMO_CachedFileReader( $filename ) {
_deprecated_constructor( self::class, '5.4.0', static::class );
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::__construct( $filename );
}

/**
* PHP4 constructor.
*
* @deprecated 5.4.0 Use __construct() instead.
*
* @see POMO_CachedIntFileReader::__construct()
*/
public function POMO_CachedIntFileReader( $filename ) {
_deprecated_constructor( self::class, '5.4.0', static::class );
self::__construct( $filename );
}
}
endif;