<?php
/*
Copyright (c) 2003, 2005, 2006, 2009 Danilo Segan <[email protected]>.

This file is part of PHP-gettext.

PHP-gettext is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

PHP-gettext is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with PHP-gettext; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

*/


// Simple class to wrap file streams, string streams, etc.
// seek is essential, and it should be byte stream
class StreamReader {
// should return a string [FIXME: perhaps return array of bytes?]
function read($bytes) {
return false;
}

// should return new position
function seekto($position) {
return false;
}

// returns current position
function currentpos() {
return false;
}

// returns length of entire stream (limit for seekto()s)
function length() {
return false;
}
};

class StringReader {
var $_pos;
var $_str;

function StringReader($str='') {
$this->_str = $str;
$this->_pos = 0;
}

function read($bytes) {
$data = substr($this->_str, $this->_pos, $bytes);
$this->_pos += $bytes;
if (strlen($this->_str)<$this->_pos)
$this->_pos = strlen($this->_str);

return $data;
}

function seekto($pos) {
$this->_pos = $pos;
if (strlen($this->_str)<$this->_pos)
$this->_pos = strlen($this->_str);
return $this->_pos;
}

function currentpos() {
return $this->_pos;
}

function length() {
return strlen($this->_str);
}

};


class FileReader {
var $_pos;
var $_fd;
var $_length;

function FileReader($filename) {
if (file_exists($filename)) {

$this->_length=filesize($filename);
$this->_pos = 0;
$this->_fd = fopen($filename,'rb');
if (!$this->_fd) {
$this->error = 3; // Cannot read file, probably permissions
return false;
}
} else {
$this->error = 2; // File doesn't exist
return false;
}
}

function read($bytes) {
if ($bytes) {
fseek($this->_fd, $this->_pos);

// PHP 5.1.1 does not read more than 8192 bytes in one fread()
// the discussions at PHP Bugs suggest it's the intended behaviour
$data = '';
while ($bytes > 0) {
$chunk = fread($this->_fd, $bytes);
$data .= $chunk;
$bytes -= strlen($chunk);
}
$this->_pos = ftell($this->_fd);

return $data;
} else return '';
}

function seekto($pos) {
fseek($this->_fd, $pos);
$this->_pos = ftell($this->_fd);
return $this->_pos;
}

function currentpos() {
return $this->_pos;
}

function length() {
return $this->_length;
}

function close() {
fclose($this->_fd);
}

};

// Preloads entire file in memory first, then creates a StringReader
// over it (it assumes knowledge of StringReader internals)
class CachedFileReader extends StringReader {
function CachedFileReader($filename) {
if (file_exists($filename)) {

$length=filesize($filename);
$fd = fopen($filename,'rb');

if (!$fd) {
$this->error = 3; // Cannot read file, probably permissions
return false;
}
$this->_str = fread($fd, $length);
fclose($fd);

} else {
$this->error = 2; // File doesn't exist
return false;
}
}
};


?>