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<?php
/**
* Zend Framework
*
* LICENSE
*
* This source file is subject to the new BSD license that is bundled
* with this package in the file LICENSE.txt.
* It is also available through the world-wide-web at this URL:
* http://framework.zend.com/license/new-bsd
* If you did not receive a copy of the license and are unable to
* obtain it through the world-wide-web, please send an email
* to license@zend.com so we can send you a copy immediately.
*
* @category Zend
* @package Zend_Pdf
* @subpackage Fonts
* @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
* @version $Id: TrimmedTable.php 18993 2009-11-15 17:09:16Z alexander $
*/
/** Zend_Pdf_Cmap */
require_once 'Zend/Pdf/Cmap.php';
/**
* Implements the "trimmed table mapping" character map (type 6).
*
* This table type is preferred over the {@link Zend_Pdf_Cmap_SegmentToDelta}
* table when the Unicode characters covered by the font fall into a single
* contiguous range.
*
* @package Zend_Pdf
* @subpackage Fonts
* @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
class Zend_Pdf_Cmap_TrimmedTable extends Zend_Pdf_Cmap
{
/**** Instance Variables ****/
/**
* The starting character code covered by this table.
* @var integer
*/
protected $_startCode = 0;
/**
* The ending character code covered by this table.
* @var integer
*/
protected $_endCode = 0;
/**
* Glyph index array. Stores the actual glyph numbers.
* @var array
*/
protected $_glyphIndexArray = array();
/**** Public Interface ****/
/* Concrete Class Implementation */
/**
* Returns an array of glyph numbers corresponding to the Unicode characters.
*
* If a particular character doesn't exist in this font, the special 'missing
* character glyph' will be substituted.
*
* See also {@link glyphNumberForCharacter()}.
*
* @param array $characterCodes Array of Unicode character codes (code points).
* @return array Array of glyph numbers.
*/
public function glyphNumbersForCharacters($characterCodes)
{
$glyphNumbers = array();
foreach ($characterCodes as $key => $characterCode) {
if (($characterCode < $this->_startCode) || ($characterCode > $this->_endCode)) {
$glyphNumbers[$key] = Zend_Pdf_Cmap::MISSING_CHARACTER_GLYPH;
continue;
}
$glyphIndex = $characterCode - $this->_startCode;
$glyphNumbers[$key] = $this->_glyphIndexArray[$glyphIndex];
}
return $glyphNumbers;
}
/**
* Returns the glyph number corresponding to the Unicode character.
*
* If a particular character doesn't exist in this font, the special 'missing
* character glyph' will be substituted.
*
* See also {@link glyphNumbersForCharacters()} which is optimized for bulk
* operations.
*
* @param integer $characterCode Unicode character code (code point).
* @return integer Glyph number.
*/
public function glyphNumberForCharacter($characterCode)
{
if (($characterCode < $this->_startCode) || ($characterCode > $this->_endCode)) {
return Zend_Pdf_Cmap::MISSING_CHARACTER_GLYPH;
}
$glyphIndex = $characterCode - $this->_startCode;
return $this->_glyphIndexArray[$glyphIndex];
}
/**
* Returns an array containing the Unicode characters that have entries in
* this character map.
*
* @return array Unicode character codes.
*/
public function getCoveredCharacters()
{
$characterCodes = array();
for ($code = $this->_startCode; $code <= $this->_endCode; $code++) {
$characterCodes[] = $code;
}
return $characterCodes;
}
/**
* Returns an array containing the glyphs numbers that have entries in this character map.
* Keys are Unicode character codes (integers)
*
* This functionality is partially covered by glyphNumbersForCharacters(getCoveredCharacters())
* call, but this method do it in more effective way (prepare complete list instead of searching
* glyph for each character code).
*
* @internal
* @return array Array representing <Unicode character code> => <glyph number> pairs.
*/
public function getCoveredCharactersGlyphs()
{
$glyphNumbers = array();
for ($code = $this->_startCode; $code <= $this->_endCode; $code++) {
$glyphNumbers[$code] = $this->_glyphIndexArray[$code - $this->_startCode];
}
return $glyphNumbers;
}
/* Object Lifecycle */
/**
* Object constructor
*
* Parses the raw binary table data. Throws an exception if the table is
* malformed.
*
* @param string $cmapData Raw binary cmap table data.
* @throws Zend_Pdf_Exception
*/
public function __construct($cmapData)
{
/* Sanity check: The table should be at least 9 bytes in size.
*/
$actualLength = strlen($cmapData);
if ($actualLength < 9) {
require_once 'Zend/Pdf/Exception.php';
throw new Zend_Pdf_Exception('Insufficient table data',
Zend_Pdf_Exception::CMAP_TABLE_DATA_TOO_SMALL);
}
/* Sanity check: Make sure this is right data for this table type.
*/
$type = $this->_extractUInt2($cmapData, 0);
if ($type != Zend_Pdf_Cmap::TYPE_TRIMMED_TABLE) {
require_once 'Zend/Pdf/Exception.php';
throw new Zend_Pdf_Exception('Wrong cmap table type',
Zend_Pdf_Exception::CMAP_WRONG_TABLE_TYPE);
}
$length = $this->_extractUInt2($cmapData, 2);
if ($length != $actualLength) {
require_once 'Zend/Pdf/Exception.php';
throw new Zend_Pdf_Exception("Table length ($length) does not match actual length ($actualLength)",
Zend_Pdf_Exception::CMAP_WRONG_TABLE_LENGTH);
}
/* Mapping tables should be language-independent. The font may not work
* as expected if they are not. Unfortunately, many font files in the
* wild incorrectly record a language ID in this field, so we can't
* call this a failure.
*/
$language = $this->_extractUInt2($cmapData, 4);
if ($language != 0) {
// Record a warning here somehow?
}
$this->_startCode = $this->_extractUInt2($cmapData, 6);
$entryCount = $this->_extractUInt2($cmapData, 8);
$expectedCount = ($length - 10) >> 1;
if ($entryCount != $expectedCount) {
require_once 'Zend/Pdf/Exception.php';
throw new Zend_Pdf_Exception("Entry count is wrong; expected: $expectedCount; actual: $entryCount",
Zend_Pdf_Exception::CMAP_WRONG_ENTRY_COUNT);
}
$this->_endCode = $this->_startCode + $entryCount - 1;
$offset = 10;
for ($i = 0; $i < $entryCount; $i++, $offset += 2) {
$this->_glyphIndexArray[] = $this->_extractUInt2($cmapData, $offset);
}
/* Sanity check: After reading all of the data, we should be at the end
* of the table.
*/
if ($offset != $length) {
require_once 'Zend/Pdf/Exception.php';
throw new Zend_Pdf_Exception("Ending offset ($offset) does not match length ($length)",
Zend_Pdf_Exception::CMAP_FINAL_OFFSET_NOT_LENGTH);
}
}
}
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