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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
* @copyright Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
* @version $Id: Tiff.php 20096 2010-01-06 02:05:09Z bkarwin $
*/
/** Internally used classes */
require_once 'Zend/Pdf/Element/Array.php';
require_once 'Zend/Pdf/Element/Name.php';
require_once 'Zend/Pdf/Element/Numeric.php';
/** Zend_Pdf_Resource_Image */
require_once 'Zend/Pdf/Resource/Image.php';
/**
* TIFF image
*
* @package Zend_Pdf
* @copyright Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
class Zend_Pdf_Resource_Image_Tiff extends Zend_Pdf_Resource_Image
{
const TIFF_FIELD_TYPE_BYTE=1;
const TIFF_FIELD_TYPE_ASCII=2;
const TIFF_FIELD_TYPE_SHORT=3;
const TIFF_FIELD_TYPE_LONG=4;
const TIFF_FIELD_TYPE_RATIONAL=5;
const TIFF_TAG_IMAGE_WIDTH=256;
const TIFF_TAG_IMAGE_LENGTH=257; //Height
const TIFF_TAG_BITS_PER_SAMPLE=258;
const TIFF_TAG_COMPRESSION=259;
const TIFF_TAG_PHOTOMETRIC_INTERPRETATION=262;
const TIFF_TAG_STRIP_OFFSETS=273;
const TIFF_TAG_SAMPLES_PER_PIXEL=277;
const TIFF_TAG_STRIP_BYTE_COUNTS=279;
const TIFF_COMPRESSION_UNCOMPRESSED = 1;
const TIFF_COMPRESSION_CCITT1D = 2;
const TIFF_COMPRESSION_GROUP_3_FAX = 3;
const TIFF_COMPRESSION_GROUP_4_FAX = 4;
const TIFF_COMPRESSION_LZW = 5;
const TIFF_COMPRESSION_JPEG = 6;
const TIFF_COMPRESSION_FLATE = 8;
const TIFF_COMPRESSION_FLATE_OBSOLETE_CODE = 32946;
const TIFF_COMPRESSION_PACKBITS = 32773;
const TIFF_PHOTOMETRIC_INTERPRETATION_WHITE_IS_ZERO=0;
const TIFF_PHOTOMETRIC_INTERPRETATION_BLACK_IS_ZERO=1;
const TIFF_PHOTOMETRIC_INTERPRETATION_RGB=2;
const TIFF_PHOTOMETRIC_INTERPRETATION_RGB_INDEXED=3;
const TIFF_PHOTOMETRIC_INTERPRETATION_CMYK=5;
const TIFF_PHOTOMETRIC_INTERPRETATION_YCBCR=6;
const TIFF_PHOTOMETRIC_INTERPRETATION_CIELAB=8;
protected $_width;
protected $_height;
protected $_imageProperties;
protected $_endianType;
protected $_fileSize;
protected $_bitsPerSample;
protected $_compression;
protected $_filter;
protected $_colorCode;
protected $_whiteIsZero;
protected $_blackIsZero;
protected $_colorSpace;
protected $_imageDataOffset;
protected $_imageDataLength;
const TIFF_ENDIAN_BIG=0;
const TIFF_ENDIAN_LITTLE=1;
const UNPACK_TYPE_BYTE=0;
const UNPACK_TYPE_SHORT=1;
const UNPACK_TYPE_LONG=2;
const UNPACK_TYPE_RATIONAL=3;
/**
* Byte unpacking function
*
* Makes it possible to unpack bytes in one statement for enhanced logic readability.
*
* @param int $type
* @param string $bytes
* @throws Zend_Pdf_Exception
*/
protected function unpackBytes($type, $bytes) {
if(!isset($this->_endianType)) {
require_once 'Zend/Pdf/Exception.php';
throw new Zend_Pdf_Exception("The unpackBytes function can only be used after the endianness of the file is known");
}
switch($type) {
case Zend_Pdf_Resource_Image_Tiff::UNPACK_TYPE_BYTE:
$format = 'C';
$unpacked = unpack($format, $bytes);
return $unpacked[1];
break;
case Zend_Pdf_Resource_Image_Tiff::UNPACK_TYPE_SHORT:
$format = ($this->_endianType == Zend_Pdf_Resource_Image_Tiff::TIFF_ENDIAN_LITTLE)?'v':'n';
$unpacked = unpack($format, $bytes);
return $unpacked[1];
break;
case Zend_Pdf_Resource_Image_Tiff::UNPACK_TYPE_LONG:
$format = ($this->_endianType == Zend_Pdf_Resource_Image_Tiff::TIFF_ENDIAN_LITTLE)?'V':'N';
$unpacked = unpack($format, $bytes);
return $unpacked[1];
break;
case Zend_Pdf_Resource_Image_Tiff::UNPACK_TYPE_RATIONAL:
$format = ($this->_endianType == Zend_Pdf_Resource_Image_Tiff::TIFF_ENDIAN_LITTLE)?'V2':'N2';
$unpacked = unpack($format, $bytes);
return ($unpacked[1]/$unpacked[2]);
break;
}
}
/**
* Object constructor
*
* @param string $imageFileName
* @throws Zend_Pdf_Exception
*/
public function __construct($imageFileName)
{
if (($imageFile = @fopen($imageFileName, 'rb')) === false ) {
require_once 'Zend/Pdf/Exception.php';
throw new Zend_Pdf_Exception( "Can not open '$imageFileName' file for reading." );
}
$byteOrderIndicator = fread($imageFile, 2);
if($byteOrderIndicator == 'II') {
$this->_endianType = Zend_Pdf_Resource_Image_Tiff::TIFF_ENDIAN_LITTLE;
} else if($byteOrderIndicator == 'MM') {
$this->_endianType = Zend_Pdf_Resource_Image_Tiff::TIFF_ENDIAN_BIG;
} else {
require_once 'Zend/Pdf/Exception.php';
throw new Zend_Pdf_Exception( "Not a tiff file or Tiff corrupt. No byte order indication found" );
}
$version = $this->unpackBytes(Zend_Pdf_Resource_Image_Tiff::UNPACK_TYPE_SHORT, fread($imageFile, 2));
if($version != 42) {
require_once 'Zend/Pdf/Exception.php';
throw new Zend_Pdf_Exception( "Not a tiff file or Tiff corrupt. Incorrect version number." );
}
$ifdOffset = $this->unpackBytes(Zend_Pdf_Resource_Image_Tiff::UNPACK_TYPE_LONG, fread($imageFile, 4));
$fileStats = fstat($imageFile);
$this->_fileSize = $fileStats['size'];
/*
* Tiff files are stored as a series of Image File Directories (IFD) each direcctory
* has a specific number of entries each 12 bytes in length. At the end of the directories
* is four bytes pointing to the offset of the next IFD.
*/
while($ifdOffset > 0) {
if(fseek($imageFile, $ifdOffset, SEEK_SET) == -1 || $ifdOffset+2 >= $this->_fileSize) {
require_once 'Zend/Pdf/Exception.php';
throw new Zend_Pdf_Exception("Could not seek to the image file directory as indexed by the file. Likely cause is TIFF corruption. Offset: ". $ifdOffset);
}
$numDirEntries = $this->unpackBytes(Zend_Pdf_Resource_Image_Tiff::UNPACK_TYPE_SHORT, fread($imageFile, 2));
/*
* Since we now know how many entries are in this (IFD) we can extract the data.
* The format of a TIFF directory entry is:
*
* 2 bytes (short) tag code; See TIFF_TAG constants at the top for supported values. (There are many more in the spec)
* 2 bytes (short) field type
* 4 bytes (long) number of values, or value count.
* 4 bytes (mixed) data if the data will fit into 4 bytes or an offset if the data is too large.
*/
for($dirEntryIdx = 1; $dirEntryIdx <= $numDirEntries; $dirEntryIdx++) {
$tag = $this->unpackBytes(Zend_Pdf_Resource_Image_Tiff::UNPACK_TYPE_SHORT, fread($imageFile, 2));
$fieldType = $this->unpackBytes(Zend_Pdf_Resource_Image_Tiff::UNPACK_TYPE_SHORT, fread($imageFile, 2));
$valueCount = $this->unpackBytes(Zend_Pdf_Resource_Image_Tiff::UNPACK_TYPE_LONG, fread($imageFile, 4));
switch($fieldType) {
case Zend_Pdf_Resource_Image_Tiff::TIFF_FIELD_TYPE_BYTE:
$fieldLength = $valueCount;
break;
case Zend_Pdf_Resource_Image_Tiff::TIFF_FIELD_TYPE_ASCII:
$fieldLength = $valueCount;
break;
case Zend_Pdf_Resource_Image_Tiff::TIFF_FIELD_TYPE_SHORT:
$fieldLength = $valueCount * 2;
break;
case Zend_Pdf_Resource_Image_Tiff::TIFF_FIELD_TYPE_LONG:
$fieldLength = $valueCount * 4;
break;
case Zend_Pdf_Resource_Image_Tiff::TIFF_FIELD_TYPE_RATIONAL:
$fieldLength = $valueCount * 8;
break;
default:
$fieldLength = $valueCount;
}
$offsetBytes = fread($imageFile, 4);
if($fieldLength <= 4) {
switch($fieldType) {
case Zend_Pdf_Resource_Image_Tiff::TIFF_FIELD_TYPE_BYTE:
$value = $this->unpackBytes(Zend_Pdf_Resource_Image_Tiff::UNPACK_TYPE_BYTE, $offsetBytes);
break;
case Zend_Pdf_Resource_Image_Tiff::TIFF_FIELD_TYPE_ASCII:
//Fall through to next case
case Zend_Pdf_Resource_Image_Tiff::TIFF_FIELD_TYPE_LONG:
$value = $this->unpackBytes(Zend_Pdf_Resource_Image_Tiff::UNPACK_TYPE_LONG, $offsetBytes);
break;
case Zend_Pdf_Resource_Image_Tiff::TIFF_FIELD_TYPE_SHORT:
//Fall through to next case
default:
$value = $this->unpackBytes(Zend_Pdf_Resource_Image_Tiff::UNPACK_TYPE_SHORT, $offsetBytes);
}
} else {
$refOffset = $this->unpackBytes(Zend_Pdf_Resource_Image_Tiff::UNPACK_TYPE_LONG, $offsetBytes);
}
/*
* Linear tag processing is probably not the best way to do this. I've processed the tags according to the
* Tiff 6 specification and make some assumptions about when tags will be < 4 bytes and fit into $value and when
* they will be > 4 bytes and require seek/extraction of the offset. Same goes for extracting arrays of data, like
* the data offsets and length. This should be fixed in the future.
*/
switch($tag) {
case Zend_Pdf_Resource_Image_Tiff::TIFF_TAG_IMAGE_WIDTH:
$this->_width = $value;
break;
case Zend_Pdf_Resource_Image_Tiff::TIFF_TAG_IMAGE_LENGTH:
$this->_height = $value;
break;
case Zend_Pdf_Resource_Image_Tiff::TIFF_TAG_BITS_PER_SAMPLE:
if($valueCount>1) {
$fp = ftell($imageFile);
fseek($imageFile, $refOffset, SEEK_SET);
$this->_bitsPerSample = $this->unpackBytes(Zend_Pdf_Resource_Image_Tiff::UNPACK_TYPE_SHORT, fread($imageFile, 2));
fseek($imageFile, $fp, SEEK_SET);
} else {
$this->_bitsPerSample = $value;
}
break;
case Zend_Pdf_Resource_Image_Tiff::TIFF_TAG_COMPRESSION:
$this->_compression = $value;
switch($value) {
case Zend_Pdf_Resource_Image_Tiff::TIFF_COMPRESSION_UNCOMPRESSED:
$this->_filter = 'None';
break;
case Zend_Pdf_Resource_Image_Tiff::TIFF_COMPRESSION_CCITT1D:
//Fall through to next case
case Zend_Pdf_Resource_Image_Tiff::TIFF_COMPRESSION_GROUP_3_FAX:
//Fall through to next case
case Zend_Pdf_Resource_Image_Tiff::TIFF_COMPRESSION_GROUP_4_FAX:
$this->_filter = 'CCITTFaxDecode';
require_once 'Zend/Pdf/Exception.php';
throw new Zend_Pdf_Exception("CCITTFaxDecode Compression Mode Not Currently Supported");
break;
case Zend_Pdf_Resource_Image_Tiff::TIFF_COMPRESSION_LZW:
$this->_filter = 'LZWDecode';
require_once 'Zend/Pdf/Exception.php';
throw new Zend_Pdf_Exception("LZWDecode Compression Mode Not Currently Supported");
break;
case Zend_Pdf_Resource_Image_Tiff::TIFF_COMPRESSION_JPEG:
$this->_filter = 'DCTDecode'; //Should work, doesnt...
require_once 'Zend/Pdf/Exception.php';
throw new Zend_Pdf_Exception("JPEG Compression Mode Not Currently Supported");
break;
case Zend_Pdf_Resource_Image_Tiff::TIFF_COMPRESSION_FLATE:
//fall through to next case
case Zend_Pdf_Resource_Image_Tiff::TIFF_COMPRESSION_FLATE_OBSOLETE_CODE:
$this->_filter = 'FlateDecode';
require_once 'Zend/Pdf/Exception.php';
throw new Zend_Pdf_Exception("ZIP/Flate Compression Mode Not Currently Supported");
break;
case Zend_Pdf_Resource_Image_Tiff::TIFF_COMPRESSION_PACKBITS:
$this->_filter = 'RunLengthDecode';
break;
}
break;
case Zend_Pdf_Resource_Image_Tiff::TIFF_TAG_PHOTOMETRIC_INTERPRETATION:
$this->_colorCode = $value;
$this->_whiteIsZero = false;
$this->_blackIsZero = false;
switch($value) {
case Zend_Pdf_Resource_Image_Tiff::TIFF_PHOTOMETRIC_INTERPRETATION_WHITE_IS_ZERO:
$this->_whiteIsZero = true;
$this->_colorSpace = 'DeviceGray';
break;
case Zend_Pdf_Resource_Image_Tiff::TIFF_PHOTOMETRIC_INTERPRETATION_BLACK_IS_ZERO:
$this->_blackIsZero = true;
$this->_colorSpace = 'DeviceGray';
break;
case Zend_Pdf_Resource_Image_Tiff::TIFF_PHOTOMETRIC_INTERPRETATION_YCBCR:
//fall through to next case
case Zend_Pdf_Resource_Image_Tiff::TIFF_PHOTOMETRIC_INTERPRETATION_RGB:
$this->_colorSpace = 'DeviceRGB';
break;
case Zend_Pdf_Resource_Image_Tiff::TIFF_PHOTOMETRIC_INTERPRETATION_RGB_INDEXED:
$this->_colorSpace = 'Indexed';
break;
case Zend_Pdf_Resource_Image_Tiff::TIFF_PHOTOMETRIC_INTERPRETATION_CMYK:
$this->_colorSpace = 'DeviceCMYK';
break;
case Zend_Pdf_Resource_Image_Tiff::TIFF_PHOTOMETRIC_INTERPRETATION_CIELAB:
$this->_colorSpace = 'Lab';
break;
default:
require_once 'Zend/Pdf/Exception.php';
throw new Zend_Pdf_Exception('TIFF: Unknown or Unsupported Color Type: '. $value);
}
break;
case Zend_Pdf_Resource_Image_Tiff::TIFF_TAG_STRIP_OFFSETS:
if($valueCount>1) {
$format = ($this->_endianType == Zend_Pdf_Resource_Image_Tiff::TIFF_ENDIAN_LITTLE)?'V*':'N*';
$fp = ftell($imageFile);
fseek($imageFile, $refOffset, SEEK_SET);
$stripOffsetsBytes = fread($imageFile, $fieldLength);
$this->_imageDataOffset = unpack($format, $stripOffsetsBytes);
fseek($imageFile, $fp, SEEK_SET);
} else {
$this->_imageDataOffset = $value;
}
break;
case Zend_Pdf_Resource_Image_Tiff::TIFF_TAG_STRIP_BYTE_COUNTS:
if($valueCount>1) {
$format = ($this->_endianType == Zend_Pdf_Resource_Image_Tiff::TIFF_ENDIAN_LITTLE)?'V*':'N*';
$fp = ftell($imageFile);
fseek($imageFile, $refOffset, SEEK_SET);
$stripByteCountsBytes = fread($imageFile, $fieldLength);
$this->_imageDataLength = unpack($format, $stripByteCountsBytes);
fseek($imageFile, $fp, SEEK_SET);
} else {
$this->_imageDataLength = $value;
}
break;
default:
//For debugging. It should be harmless to ignore unknown tags, though there is some good info in them.
//echo "Unknown tag detected: ". $tag . " value: ". $value;
}
}
$ifdOffset = $this->unpackBytes(Zend_Pdf_Resource_Image_Tiff::UNPACK_TYPE_LONG, fread($imageFile, 4));
}
if(!isset($this->_imageDataOffset) || !isset($this->_imageDataLength)) {
require_once 'Zend/Pdf/Exception.php';
throw new Zend_Pdf_Exception("TIFF: The image processed did not contain image data as expected.");
}
$imageDataBytes = '';
if(is_array($this->_imageDataOffset)) {
if(!is_array($this->_imageDataLength)) {
require_once 'Zend/Pdf/Exception.php';
throw new Zend_Pdf_Exception("TIFF: The image contained multiple data offsets but not multiple data lengths. Tiff may be corrupt.");
}
foreach($this->_imageDataOffset as $idx => $offset) {
fseek($imageFile, $this->_imageDataOffset[$idx], SEEK_SET);
$imageDataBytes .= fread($imageFile, $this->_imageDataLength[$idx]);
}
} else {
fseek($imageFile, $this->_imageDataOffset, SEEK_SET);
$imageDataBytes = fread($imageFile, $this->_imageDataLength);
}
if($imageDataBytes === '') {
require_once 'Zend/Pdf/Exception.php';
throw new Zend_Pdf_Exception("TIFF: No data. Image Corruption");
}
fclose($imageFile);
parent::__construct();
$imageDictionary = $this->_resource->dictionary;
if(!isset($this->_width) || !isset($this->_width)) {
require_once 'Zend/Pdf/Exception.php';
throw new Zend_Pdf_Exception("Problem reading tiff file. Tiff is probably corrupt.");
}
$this->_imageProperties = array();
$this->_imageProperties['bitDepth'] = $this->_bitsPerSample;
$this->_imageProperties['fileSize'] = $this->_fileSize;
$this->_imageProperties['TIFFendianType'] = $this->_endianType;
$this->_imageProperties['TIFFcompressionType'] = $this->_compression;
$this->_imageProperties['TIFFwhiteIsZero'] = $this->_whiteIsZero;
$this->_imageProperties['TIFFblackIsZero'] = $this->_blackIsZero;
$this->_imageProperties['TIFFcolorCode'] = $this->_colorCode;
$this->_imageProperties['TIFFimageDataOffset'] = $this->_imageDataOffset;
$this->_imageProperties['TIFFimageDataLength'] = $this->_imageDataLength;
$this->_imageProperties['PDFfilter'] = $this->_filter;
$this->_imageProperties['PDFcolorSpace'] = $this->_colorSpace;
$imageDictionary->Width = new Zend_Pdf_Element_Numeric($this->_width);
if($this->_whiteIsZero === true) {
$imageDictionary->Decode = new Zend_Pdf_Element_Array(array(new Zend_Pdf_Element_Numeric(1), new Zend_Pdf_Element_Numeric(0)));
}
$imageDictionary->Height = new Zend_Pdf_Element_Numeric($this->_height);
$imageDictionary->ColorSpace = new Zend_Pdf_Element_Name($this->_colorSpace);
$imageDictionary->BitsPerComponent = new Zend_Pdf_Element_Numeric($this->_bitsPerSample);
if(isset($this->_filter) && $this->_filter != 'None') {
$imageDictionary->Filter = new Zend_Pdf_Element_Name($this->_filter);
}
$this->_resource->value = $imageDataBytes;
$this->_resource->skipFilters();
}
/**
* Image width (defined in Zend_Pdf_Resource_Image_Interface)
*/
public function getPixelWidth() {
return $this->_width;
}
/**
* Image height (defined in Zend_Pdf_Resource_Image_Interface)
*/
public function getPixelHeight() {
return $this->_height;
}
/**
* Image properties (defined in Zend_Pdf_Resource_Image_Interface)
*/
public function getProperties() {
return $this->_imageProperties;
}
}
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