gnu-social/extlib/php-gettext/streams.php

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<?php
/*
Copyright (c) 2003, 2005, 2006, 2009 Danilo Segan <danilo@kvota.net>.
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?]
public function read($bytes)
{
return false;
}
// should return new position
public function seekto($position)
{
return false;
}
// returns current position
public function currentpos()
{
return false;
}
// returns length of entire stream (limit for seekto()s)
public function length()
{
return false;
}
};
class StringReader
{
public $_pos;
public $_str;
public function StringReader($str='')
{
$this->_str = $str;
$this->_pos = 0;
}
public function read($bytes)
{
$data = substr($this->_str, $this->_pos, $bytes);
$this->_pos += $bytes;
if (strlen($this->_str)<$this->_pos) {
$this->_pos = strlen($this->_str);
}
return $data;
}
public function seekto($pos)
{
$this->_pos = $pos;
if (strlen($this->_str)<$this->_pos) {
$this->_pos = strlen($this->_str);
}
return $this->_pos;
}
public function currentpos()
{
return $this->_pos;
}
public function length()
{
return strlen($this->_str);
}
};
class FileReader
{
public $_pos;
public $_fd;
public $_length;
public function FileReader($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 {
$this->error = 2; // File doesn't exist
return false;
}
}
public function read($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 $data;
} else {
return '';
}
}
public function seekto($pos)
{
fseek($this->_fd, $pos);
$this->_pos = ftell($this->_fd);
return $this->_pos;
}
public function currentpos()
{
return $this->_pos;
}
public function length()
{
return $this->_length;
}
public function close()
{
fclose($this->_fd);
}
};
// Preloads entire file in memory first, then creates a StringReader
// over it (it assumes knowledge of StringReader internals)
class CachedFileReader extends StringReader
{
public 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;
}
}
};