* {@link http://developer.apple.com/textfonts/TTRefMan/RM06/Chap6cmap.html}
* {@link http://www.microsoft.com/OpenType/OTSpec/cmap.htm}
* {@link http://partners.adobe.com/public/developer/opentype/index_cmap.html}
*
*
* @todo Write code for Zend_Pdf_FontCmap_HighByteMapping class.
* @todo Write code for Zend_Pdf_FontCmap_MixedCoverage class.
* @todo Write code for Zend_Pdf_FontCmap_TrimmedArray class.
* @todo Write code for Zend_Pdf_FontCmap_SegmentedCoverage class.
*
* @package Zend_Pdf
* @subpackage Fonts
* @copyright Copyright (c) 2005-2007 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
abstract class Zend_Pdf_Cmap
{
/**** Class Constants ****/
/* Cmap Table Types */
/**
* Byte Encoding character map table type.
*/
const TYPE_BYTE_ENCODING = 0x00;
/**
* High Byte Mapping character map table type.
*/
const TYPE_HIGH_BYTE_MAPPING = 0x02;
/**
* Segment Value to Delta Mapping character map table type.
*/
const TYPE_SEGMENT_TO_DELTA = 0x04;
/**
* Trimmed Table character map table type.
*/
const TYPE_TRIMMED_TABLE = 0x06;
/**
* Mixed Coverage character map table type.
*/
const TYPE_MIXED_COVERAGE = 0x08;
/**
* Trimmed Array character map table type.
*/
const TYPE_TRIMMED_ARRAY = 0x0a;
/**
* Segmented Coverage character map table type.
*/
const TYPE_SEGMENTED_COVERAGE = 0x0c;
/**
* Static Byte Encoding character map table type. Variant of
* {@link TYPE_BYTEENCODING}.
*/
const TYPE_BYTE_ENCODING_STATIC = 0xf1;
/**
* Unknown character map table type.
*/
const TYPE_UNKNOWN = 0xff;
/* Special Glyph Names */
/**
* Glyph representing missing characters.
*/
const MISSING_CHARACTER_GLYPH = 0x00;
/**** Public Interface ****/
/* Factory Methods */
/**
* Instantiates the appropriate concrete subclass based on the type of cmap
* table and returns the instance.
*
* The cmap type must be one of the following values:
*
* - {@link Zend_Pdf_Cmap::TYPE_BYTE_ENCODING}
*
- {@link Zend_Pdf_Cmap::TYPE_BYTE_ENCODING_STATIC}
*
- {@link Zend_Pdf_Cmap::TYPE_HIGH_BYTE_MAPPING}
*
- {@link Zend_Pdf_Cmap::TYPE_SEGMENT_TO_DELTA}
*
- {@link Zend_Pdf_Cmap::TYPE_TRIMMED_TABLE}
*
- {@link Zend_Pdf_Cmap::TYPE_MIXED_COVERAGE}
*
- {@link Zend_Pdf_Cmap::TYPE_TRIMMED_ARRAY}
*
- {@link Zend_Pdf_Cmap::TYPE_SEGMENTED_COVERAGE}
*
*
* Throws an exception if the table type is invalid or the cmap table data
* cannot be validated.
*
* @param integer $cmapType Type of cmap.
* @param mixed $cmapData Cmap table data. Usually a string or array.
* @return Zend_Pdf_Cmap
* @throws Zend_Pdf_Exception
*/
public static function cmapWithTypeData($cmapType, $cmapData)
{
switch ($cmapType) {
case Zend_Pdf_Cmap::TYPE_BYTE_ENCODING:
return new Zend_Pdf_Cmap_ByteEncoding($cmapData);
case Zend_Pdf_Cmap::TYPE_BYTE_ENCODING_STATIC:
return new Zend_Pdf_Cmap_ByteEncoding_Static($cmapData);
case Zend_Pdf_Cmap::TYPE_HIGH_BYTE_MAPPING:
throw new Zend_Pdf_Exception('High byte mapping cmap currently unsupported',
Zend_Pdf_Exception::CMAP_TYPE_UNSUPPORTED);
case Zend_Pdf_Cmap::TYPE_SEGMENT_TO_DELTA:
return new Zend_Pdf_Cmap_SegmentToDelta($cmapData);
case Zend_Pdf_Cmap::TYPE_TRIMMED_TABLE:
return new Zend_Pdf_Cmap_TrimmedTable($cmapData);
case Zend_Pdf_Cmap::TYPE_MIXED_COVERAGE:
throw new Zend_Pdf_Exception('Mixed coverage cmap currently unsupported',
Zend_Pdf_Exception::CMAP_TYPE_UNSUPPORTED);
case Zend_Pdf_Cmap::TYPE_TRIMMED_ARRAY:
throw new Zend_Pdf_Exception('Trimmed array cmap currently unsupported',
Zend_Pdf_Exception::CMAP_TYPE_UNSUPPORTED);
case Zend_Pdf_Cmap::TYPE_SEGMENTED_COVERAGE:
throw new Zend_Pdf_Exception('Segmented coverage cmap currently unsupported',
Zend_Pdf_Exception::CMAP_TYPE_UNSUPPORTED);
default:
throw new Zend_Pdf_Exception("Unknown cmap type: $cmapType",
Zend_Pdf_Exception::CMAP_UNKNOWN_TYPE);
}
}
/* Abstract Methods */
/**
* Object constructor
*
* Parses the raw binary table data. Throws an exception if the table is
* malformed.
*
* @param string $cmapData Raw binary cmap table data.
* @throws Zend_Pdf_Exception
*/
abstract public function __construct($cmapData);
/**
* 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 $characterCodes Array of Unicode character codes (code points).
* @return array Array of glyph numbers.
*/
abstract public function glyphNumbersForCharacters($characterCodes);
/**
* 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 $characterCode Unicode character code (code point).
* @return integer Glyph number.
*/
abstract public function glyphNumberForCharacter($characterCode);
/**
* Returns an array containing the Unicode characters that have entries in
* this character map.
*
* @return array Unicode character codes.
*/
abstract public function getCoveredCharacters();
/**** Internal Methods ****/
/* Internal Utility Methods */
/**
* Extracts a signed 2-byte integer from a string.
*
* Integers are always big-endian. Throws an exception if the index is out
* of range.
*
* @param string &$data
* @param integer $index Position in string of integer.
* @return integer
* @throws Zend_Pdf_Exception
*/
protected function _extractInt2(&$data, $index)
{
if (($index < 0) | (($index + 1) > strlen($data))) {
throw new Zend_Pdf_Exception("Index out of range: $index",
Zend_Pdf_Exception::INDEX_OUT_OF_RANGE);
}
$number = ord($data[$index]);
if (($number & 0x80) == 0x80) { // negative
$number = ~((((~ $number) & 0xff) << 8) | ((~ ord($data[++$index])) & 0xff));
} else {
$number = ($number << 8) | ord($data[++$index]);
}
return $number;
}
/**
* Extracts an unsigned 2-byte integer from a string.
*
* Integers are always big-endian. Throws an exception if the index is out
* of range.
*
* @param string &$data
* @param integer $index Position in string of integer.
* @return integer
* @throws Zend_Pdf_Exception
*/
protected function _extractUInt2(&$data, $index)
{
if (($index < 0) | (($index + 1) > strlen($data))) {
throw new Zend_Pdf_Exception("Index out of range: $index",
Zend_Pdf_Exception::INDEX_OUT_OF_RANGE);
}
$number = (ord($data[$index]) << 8) | ord($data[++$index]);
return $number;
}
/**
* Extracts an unsigned 4-byte integer from a string.
*
* Integers are always big-endian. Throws an exception if the index is out
* of range.
*
* NOTE: If you ask for a 4-byte unsigned integer on a 32-bit machine, the
* resulting value WILL BE SIGNED because PHP uses signed integers internally
* for everything. To guarantee portability, be sure to use bitwise or
* similar operators on large integers!
*
* @param string &$data
* @param integer $index Position in string of integer.
* @return integer
* @throws Zend_Pdf_Exception
*/
protected function _extractUInt4(&$data, $index)
{
if (($index < 0) | (($index + 3) > strlen($data))) {
throw new Zend_Pdf_Exception("Index out of range: $index",
Zend_Pdf_Exception::INDEX_OUT_OF_RANGE);
}
$number = (ord($data[$index]) << 24) | (ord($data[++$index]) << 16) |
(ord($data[++$index]) << 8) | ord($data[++$index]);
return $number;
}
}