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- <?php
-
-
- class StreamReader
- {
-
- public function read($bytes)
- {
- return false;
- }
-
- public function seekto($position)
- {
- return false;
- }
-
- public function currentpos()
- {
- return false;
- }
-
- 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;
- return false;
- }
- } else {
- $this->error = 2;
- return false;
- }
- }
- public function read($bytes)
- {
- if ($bytes) {
- fseek($this->_fd, $this->_pos);
-
-
- $data = '';
- while ($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);
- }
- };
- class CachedFileReader extends StringReader
- {
- public function CachedFileReader($filename)
- {
- if (file_exists($filename)) {
- $length=filesize($filename);
- $fd = fopen($filename, 'rb');
- if (!$fd) {
- $this->error = 3;
- return false;
- }
- $this->_str = fread($fd, $length);
- fclose($fd);
- } else {
- $this->error = 2;
- return false;
- }
- }
- };
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