FileParserDataSource.php

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<?php
abstract class Zend_Pdf_FileParserDataSource
{
  /**** Instance Variables ****/


    protected $_size = 0;

    protected $_offset = 0;



  /**** Public Interface ****/


  /* Abstract Methods */

    abstract public function __destruct();

    abstract public function readBytes($byteCount);

    abstract public function readAllBytes();


  /* Object Magic Methods */

    public function __toString()
    {
        return get_class($this);
    }


  /* Accessors */

    public function getOffset()
    {
        return $this->_offset;
    }

    public function getSize()
    {
        return $this->_size;
    }


  /* Primitive Methods */

    public function moveToOffset($offset)
    {
        if ($this->_offset == $offset) {
            return;    // Not moving; do nothing.
        }
        if ($offset < 0) {
            #require_once 'Zend/Pdf/Exception.php';
            throw new Zend_Pdf_Exception('Attempt to move before start of data source',
                                         Zend_Pdf_Exception::MOVE_BEFORE_START_OF_FILE);
        }
        if ($offset >= $this->_size) {    // Offsets are zero-based.
            #require_once 'Zend/Pdf/Exception.php';
            throw new Zend_Pdf_Exception('Attempt to move beyond end of data source',
                                         Zend_Pdf_Exception::MOVE_BEYOND_END_OF_FILE);
        }
        $this->_offset = $offset;
    }

    public function skipBytes($byteCount)
    {
        $this->moveToOffset($this->_offset + $byteCount);
    }
}