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Png.php 0000604 00000041423 15071355406 0006007 0 ustar 00 <?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.
*
* @package Zend_Pdf
* @copyright Copyright (c) 2005-2008 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
/** Zend_Pdf_Resource_Image */
require_once 'Zend/Pdf/Resource/Image.php';
/** Zend_Pdf_Exception */
require_once 'Zend/Pdf/Exception.php';
/** Zend_Pdf_Element_Numeric */
require_once 'Zend/Pdf/Element/Numeric.php';
/** Zend_Pdf_Element_Name */
require_once 'Zend/Pdf/Element/Name.php';
/** Zend_Pdf_ElementFactory */
require_once 'Zend/Pdf/ElementFactory.php';
/**
* PNG image
*
* @package Zend_Pdf
* @copyright Copyright (c) 2005-2008 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
class Zend_Pdf_Resource_Image_Png extends Zend_Pdf_Resource_Image
{
const PNG_COMPRESSION_DEFAULT_STRATEGY = 0;
const PNG_COMPRESSION_FILTERED = 1;
const PNG_COMPRESSION_HUFFMAN_ONLY = 2;
const PNG_COMPRESSION_RLE = 3;
const PNG_FILTER_NONE = 0;
const PNG_FILTER_SUB = 1;
const PNG_FILTER_UP = 2;
const PNG_FILTER_AVERAGE = 3;
const PNG_FILTER_PAETH = 4;
const PNG_INTERLACING_DISABLED = 0;
const PNG_INTERLACING_ENABLED = 1;
const PNG_CHANNEL_GRAY = 0;
const PNG_CHANNEL_RGB = 2;
const PNG_CHANNEL_INDEXED = 3;
const PNG_CHANNEL_GRAY_ALPHA = 4;
const PNG_CHANNEL_RGB_ALPHA = 6;
protected $_width;
protected $_height;
protected $_imageProperties;
/**
* Object constructor
*
* @param string $imageFileName
* @throws Zend_Pdf_Exception
* @todo Add compression conversions to support compression strategys other than PNG_COMPRESSION_DEFAULT_STRATEGY.
* @todo Add pre-compression filtering.
* @todo Add interlaced image handling.
* @todo Add support for 16-bit images. Requires PDF version bump to 1.5 at least.
* @todo Add processing for all PNG chunks defined in the spec. gAMA etc.
* @todo Fix tRNS chunk support for Indexed Images to a SMask.
*/
public function __construct($imageFileName)
{
if (($imageFile = @fopen($imageFileName, 'rb')) === false ) {
throw new Zend_Pdf_Exception( "Can not open '$imageFileName' file for reading." );
}
parent::__construct();
//Check if the file is a PNG
fseek($imageFile, 1, SEEK_CUR); //First signature byte (%)
if ('PNG' != fread($imageFile, 3)) {
throw new Zend_Pdf_Exception('Image is not a PNG');
}
fseek($imageFile, 12, SEEK_CUR); //Signature bytes (Includes the IHDR chunk) IHDR processed linerarly because it doesnt contain a variable chunk length
$wtmp = unpack('Ni',fread($imageFile, 4)); //Unpack a 4-Byte Long
$width = $wtmp['i'];
$htmp = unpack('Ni',fread($imageFile, 4));
$height = $htmp['i'];
$bits = ord(fread($imageFile, 1)); //Higher than 8 bit depths are only supported in later versions of PDF.
$color = ord(fread($imageFile, 1));
$compression = ord(fread($imageFile, 1));
$prefilter = ord(fread($imageFile,1));
if (($interlacing = ord(fread($imageFile,1))) != Zend_Pdf_Resource_Image_Png::PNG_INTERLACING_DISABLED) {
throw new Zend_Pdf_Exception( "Only non-interlaced images are currently supported." );
}
$this->_width = $width;
$this->_height = $height;
$this->_imageProperties = array();
$this->_imageProperties['bitDepth'] = $bits;
$this->_imageProperties['pngColorType'] = $color;
$this->_imageProperties['pngFilterType'] = $prefilter;
$this->_imageProperties['pngCompressionType'] = $compression;
$this->_imageProperties['pngInterlacingType'] = $interlacing;
fseek($imageFile, 4, SEEK_CUR); //4 Byte Ending Sequence
$imageData = '';
/*
* The following loop processes PNG chunks. 4 Byte Longs are packed first give the chunk length
* followed by the chunk signature, a four byte code. IDAT and IEND are manditory in any PNG.
*/
while(($chunkLengthBytes = fread($imageFile, 4)) !== false) {
$chunkLengthtmp = unpack('Ni', $chunkLengthBytes);
$chunkLength = $chunkLengthtmp['i'];
$chunkType = fread($imageFile, 4);
switch($chunkType) {
case 'IDAT': //Image Data
/*
* Reads the actual image data from the PNG file. Since we know at this point that the compression
* strategy is the default strategy, we also know that this data is Zip compressed. We will either copy
* the data directly to the PDF and provide the correct FlateDecode predictor, or decompress the data
* decode the filters and output the data as a raw pixel map.
*/
$imageData .= fread($imageFile, $chunkLength);
fseek($imageFile, 4, SEEK_CUR);
break;
case 'PLTE': //Palette
$paletteData = fread($imageFile, $chunkLength);
fseek($imageFile, 4, SEEK_CUR);
break;
case 'tRNS': //Basic (non-alpha channel) transparency.
$trnsData = fread($imageFile, $chunkLength);
switch ($color) {
case Zend_Pdf_Resource_Image_Png::PNG_CHANNEL_GRAY:
$baseColor = ord(substr($trnsData, 1, 1));
$transparencyData = array(new Zend_Pdf_Element_Numeric($baseColor), new Zend_Pdf_Element_Numeric($baseColor));
break;
case Zend_Pdf_Resource_Image_Png::PNG_CHANNEL_RGB:
$red = ord(substr($trnsData,1,1));
$green = ord(substr($trnsData,3,1));
$blue = ord(substr($trnsData,5,1));
$transparencyData = array(new Zend_Pdf_Element_Numeric($red), new Zend_Pdf_Element_Numeric($red), new Zend_Pdf_Element_Numeric($green), new Zend_Pdf_Element_Numeric($green), new Zend_Pdf_Element_Numeric($blue), new Zend_Pdf_Element_Numeric($blue));
break;
case Zend_Pdf_Resource_Image_Png::PNG_CHANNEL_INDEXED:
//Find the first transparent color in the index, we will mask that. (This is a bit of a hack. This should be a SMask and mask all entries values).
if(($trnsIdx = strpos($trnsData, chr(0))) !== false) {
$transparencyData = array(new Zend_Pdf_Element_Numeric($trnsIdx), new Zend_Pdf_Element_Numeric($trnsIdx));
}
break;
case Zend_Pdf_Resource_Image_Png::PNG_CHANNEL_GRAY_ALPHA:
// Fall through to the next case
case Zend_Pdf_Resource_Image_Png::PNG_CHANNEL_RGB_ALPHA:
throw new Zend_Pdf_Exception( "tRNS chunk illegal for Alpha Channel Images" );
break;
}
fseek($imageFile, 4, SEEK_CUR); //4 Byte Ending Sequence
break;
case 'IEND';
break 2; //End the loop too
default:
fseek($imageFile, $chunkLength + 4, SEEK_CUR); //Skip the section
break;
}
}
fclose($imageFile);
$compressed = true;
$imageDataTmp = '';
$smaskData = '';
switch ($color) {
case Zend_Pdf_Resource_Image_Png::PNG_CHANNEL_RGB:
$colorSpace = new Zend_Pdf_Element_Name('DeviceRGB');
break;
case Zend_Pdf_Resource_Image_Png::PNG_CHANNEL_GRAY:
$colorSpace = new Zend_Pdf_Element_Name('DeviceGray');
break;
case Zend_Pdf_Resource_Image_Png::PNG_CHANNEL_INDEXED:
if(empty($paletteData)) {
throw new Zend_Pdf_Exception( "PNG Corruption: No palette data read for indexed type PNG." );
}
$colorSpace = new Zend_Pdf_Element_Array();
$colorSpace->items[] = new Zend_Pdf_Element_Name('Indexed');
$colorSpace->items[] = new Zend_Pdf_Element_Name('DeviceRGB');
$colorSpace->items[] = new Zend_Pdf_Element_Numeric((strlen($paletteData)/3-1));
$paletteObject = $this->_objectFactory->newObject(new Zend_Pdf_Element_String_Binary($paletteData));
$colorSpace->items[] = $paletteObject;
break;
case Zend_Pdf_Resource_Image_Png::PNG_CHANNEL_GRAY_ALPHA:
/*
* To decode PNG's with alpha data we must create two images from one. One image will contain the Gray data
* the other will contain the Gray transparency overlay data. The former will become the object data and the latter
* will become the Shadow Mask (SMask).
*/
if($bits > 8) {
throw new Zend_Pdf_Exception("Alpha PNGs with bit depth > 8 are not yet supported");
}
$colorSpace = new Zend_Pdf_Element_Name('DeviceGray');
$decodingObjFactory = Zend_Pdf_ElementFactory::createFactory(1);
$decodingStream = $decodingObjFactory->newStreamObject($imageData);
$decodingStream->dictionary->Filter = new Zend_Pdf_Element_Name('FlateDecode');
$decodingStream->dictionary->DecodeParms = new Zend_Pdf_Element_Dictionary();
$decodingStream->dictionary->DecodeParms->Predictor = new Zend_Pdf_Element_Numeric(15);
$decodingStream->dictionary->DecodeParms->Columns = new Zend_Pdf_Element_Numeric($width);
$decodingStream->dictionary->DecodeParms->Colors = new Zend_Pdf_Element_Numeric(2); //GreyAlpha
$decodingStream->dictionary->DecodeParms->BitsPerComponent = new Zend_Pdf_Element_Numeric($bits);
$decodingStream->skipFilters();
$pngDataRawDecoded = $decodingStream->value;
//Iterate every pixel and copy out gray data and alpha channel (this will be slow)
for($pixel = 0, $pixelcount = ($width * $height); $pixel < $pixelcount; $pixel++) {
$imageDataTmp .= $pngDataRawDecoded[($pixel*2)];
$smaskData .= $pngDataRawDecoded[($pixel*2)+1];
}
$compressed = false;
$imageData = $imageDataTmp; //Overwrite image data with the gray channel without alpha
break;
case Zend_Pdf_Resource_Image_Png::PNG_CHANNEL_RGB_ALPHA:
/*
* To decode PNG's with alpha data we must create two images from one. One image will contain the RGB data
* the other will contain the Gray transparency overlay data. The former will become the object data and the latter
* will become the Shadow Mask (SMask).
*/
if($bits > 8) {
throw new Zend_Pdf_Exception("Alpha PNGs with bit depth > 8 are not yet supported");
}
$colorSpace = new Zend_Pdf_Element_Name('DeviceRGB');
$decodingObjFactory = Zend_Pdf_ElementFactory::createFactory(1);
$decodingStream = $decodingObjFactory->newStreamObject($imageData);
$decodingStream->dictionary->Filter = new Zend_Pdf_Element_Name('FlateDecode');
$decodingStream->dictionary->DecodeParms = new Zend_Pdf_Element_Dictionary();
$decodingStream->dictionary->DecodeParms->Predictor = new Zend_Pdf_Element_Numeric(15);
$decodingStream->dictionary->DecodeParms->Columns = new Zend_Pdf_Element_Numeric($width);
$decodingStream->dictionary->DecodeParms->Colors = new Zend_Pdf_Element_Numeric(4); //RGBA
$decodingStream->dictionary->DecodeParms->BitsPerComponent = new Zend_Pdf_Element_Numeric($bits);
$decodingStream->skipFilters();
$pngDataRawDecoded = $decodingStream->value;
//Iterate every pixel and copy out rgb data and alpha channel (this will be slow)
for($pixel = 0, $pixelcount = ($width * $height); $pixel < $pixelcount; $pixel++) {
$imageDataTmp .= $pngDataRawDecoded[($pixel*4)+0] . $pngDataRawDecoded[($pixel*4)+1] . $pngDataRawDecoded[($pixel*4)+2];
$smaskData .= $pngDataRawDecoded[($pixel*4)+3];
}
$compressed = false;
$imageData = $imageDataTmp; //Overwrite image data with the RGB channel without alpha
break;
default:
throw new Zend_Pdf_Exception( "PNG Corruption: Invalid color space." );
}
if(empty($imageData)) {
throw new Zend_Pdf_Exception( "Corrupt PNG Image. Mandatory IDAT chunk not found." );
}
$imageDictionary = $this->_resource->dictionary;
if(!empty($smaskData)) {
/*
* Includes the Alpha transparency data as a Gray Image, then assigns the image as the Shadow Mask for the main image data.
*/
$smaskStream = $this->_objectFactory->newStreamObject($smaskData);
$smaskStream->dictionary->Type = new Zend_Pdf_Element_Name('XObject');
$smaskStream->dictionary->Subtype = new Zend_Pdf_Element_Name('Image');
$smaskStream->dictionary->Width = new Zend_Pdf_Element_Numeric($width);
$smaskStream->dictionary->Height = new Zend_Pdf_Element_Numeric($height);
$smaskStream->dictionary->ColorSpace = new Zend_Pdf_Element_Name('DeviceGray');
$smaskStream->dictionary->BitsPerComponent = new Zend_Pdf_Element_Numeric($bits);
$imageDictionary->SMask = $smaskStream;
// Encode stream with FlateDecode filter
$smaskStreamDecodeParms = array();
$smaskStreamDecodeParms['Predictor'] = new Zend_Pdf_Element_Numeric(15);
$smaskStreamDecodeParms['Columns'] = new Zend_Pdf_Element_Numeric($width);
$smaskStreamDecodeParms['Colors'] = new Zend_Pdf_Element_Numeric(1);
$smaskStreamDecodeParms['BitsPerComponent'] = new Zend_Pdf_Element_Numeric(8);
$smaskStream->dictionary->DecodeParms = new Zend_Pdf_Element_Dictionary($smaskStreamDecodeParms);
$smaskStream->dictionary->Filter = new Zend_Pdf_Element_Name('FlateDecode');
}
if(!empty($transparencyData)) {
//This is experimental and not properly tested.
$imageDictionary->Mask = new Zend_Pdf_Element_Array($transparencyData);
}
$imageDictionary->Width = new Zend_Pdf_Element_Numeric($width);
$imageDictionary->Height = new Zend_Pdf_Element_Numeric($height);
$imageDictionary->ColorSpace = $colorSpace;
$imageDictionary->BitsPerComponent = new Zend_Pdf_Element_Numeric($bits);
$imageDictionary->Filter = new Zend_Pdf_Element_Name('FlateDecode');
$decodeParms = array();
$decodeParms['Predictor'] = new Zend_Pdf_Element_Numeric(15); // Optimal prediction
$decodeParms['Columns'] = new Zend_Pdf_Element_Numeric($width);
$decodeParms['Colors'] = new Zend_Pdf_Element_Numeric((($color==Zend_Pdf_Resource_Image_Png::PNG_CHANNEL_RGB || $color==Zend_Pdf_Resource_Image_Png::PNG_CHANNEL_RGB_ALPHA)?(3):(1)));
$decodeParms['BitsPerComponent'] = new Zend_Pdf_Element_Numeric($bits);
$imageDictionary->DecodeParms = new Zend_Pdf_Element_Dictionary($decodeParms);
//Include only the image IDAT section data.
$this->_resource->value = $imageData;
//Skip double compression
if ($compressed) {
$this->_resource->skipFilters();
}
}
/**
* Image width
*/
public function getPixelWidth() {
return $this->_width;
}
/**
* Image height
*/
public function getPixelHeight() {
return $this->_height;
}
/**
* Image properties
*/
public function getProperties() {
return $this->_imageProperties;
}
}
Jpeg.php 0000604 00000010412 15071514105 0006133 0 ustar 00 <?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.
*
* @package Zend_Pdf
* @copyright Copyright (c) 2005-2008 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
/** Zend_Pdf_Resource_Image */
require_once 'Zend/Pdf/Resource/Image.php';
/** Zend_Pdf_Exception */
require_once 'Zend/Pdf/Exception.php';
/** Zend_Pdf_Element_Numeric */
require_once 'Zend/Pdf/Element/Numeric.php';
/** Zend_Pdf_Element_Name */
require_once 'Zend/Pdf/Element/Name.php';
/**
* JPEG image
*
* @package Zend_Pdf
* @copyright Copyright (c) 2005-2008 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
class Zend_Pdf_Resource_Image_Jpeg extends Zend_Pdf_Resource_Image
{
protected $_width;
protected $_height;
protected $_imageProperties;
/**
* Object constructor
*
* @param string $imageFileName
* @throws Zend_Pdf_Exception
*/
public function __construct($imageFileName)
{
if (!function_exists('gd_info')) {
throw new Zend_Pdf_Exception('Image extension is not installed.');
}
$gd_options = gd_info();
if (!$gd_options['JPG Support'] ) {
throw new Zend_Pdf_Exception('JPG support is not configured properly.');
}
if (($imageInfo = getimagesize($imageFileName)) === false) {
throw new Zend_Pdf_Exception('Corrupted image or image doesn\'t exist.');
}
if ($imageInfo[2] != IMAGETYPE_JPEG && $imageInfo[2] != IMAGETYPE_JPEG2000) {
throw new Zend_Pdf_Exception('ImageType is not JPG');
}
parent::__construct();
switch ($imageInfo['channels']) {
case 3:
$colorSpace = 'DeviceRGB';
break;
case 4:
$colorSpace = 'DeviceCMYK';
break;
default:
$colorSpace = 'DeviceGray';
break;
}
$imageDictionary = $this->_resource->dictionary;
$imageDictionary->Width = new Zend_Pdf_Element_Numeric($imageInfo[0]);
$imageDictionary->Height = new Zend_Pdf_Element_Numeric($imageInfo[1]);
$imageDictionary->ColorSpace = new Zend_Pdf_Element_Name($colorSpace);
$imageDictionary->BitsPerComponent = new Zend_Pdf_Element_Numeric($imageInfo['bits']);
if ($imageInfo[2] == IMAGETYPE_JPEG) {
$imageDictionary->Filter = new Zend_Pdf_Element_Name('DCTDecode');
} else if ($imageInfo[2] == IMAGETYPE_JPEG2000){
$imageDictionary->Filter = new Zend_Pdf_Element_Name('JPXDecode');
}
if (($imageFile = @fopen($imageFileName, 'rb')) === false ) {
throw new Zend_Pdf_Exception( "Can not open '$imageFileName' file for reading." );
}
$byteCount = filesize($imageFileName);
$this->_resource->value = '';
while ( $byteCount > 0 && ($nextBlock = fread($imageFile, $byteCount)) != false ) {
$this->_resource->value .= $nextBlock;
$byteCount -= strlen($nextBlock);
}
fclose($imageFile);
$this->_resource->skipFilters();
$this->_width = $imageInfo[0];
$this->_height = $imageInfo[1];
$this->_imageProperties = array();
$this->_imageProperties['bitDepth'] = $imageInfo['bits'];
$this->_imageProperties['jpegImageType'] = $imageInfo[2];
$this->_imageProperties['jpegColorType'] = $imageInfo['channels'];
}
/**
* Image width
*/
public function getPixelWidth() {
return $this->_width;
}
/**
* Image height
*/
public function getPixelHeight() {
return $this->_height;
}
/**
* Image properties
*/
public function getProperties() {
return $this->_imageProperties;
}
}
Tiff.php 0000604 00000051014 15071514105 0006141 0 ustar 00 <?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.
*
* @package Zend_Pdf
* @copyright Copyright (c) 2005-2008 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
/** Zend_Pdf_Resource_Image */
require_once 'Zend/Pdf/Resource/Image.php';
/** Zend_Pdf_Exception */
require_once 'Zend/Pdf/Exception.php';
/** Zend_Pdf_Element_Numeric */
require_once 'Zend/Pdf/Element/Numeric.php';
/** Zend_Pdf_Element_Name */
require_once 'Zend/Pdf/Element/Name.php';
/**
* TIFF image
*
* @package Zend_Pdf
* @copyright Copyright (c) 2005-2008 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)) {
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 ) {
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 {
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) {
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) {
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';
throw new Zend_Pdf_Exception("CCITTFaxDecode Compression Mode Not Currently Supported");
break;
case Zend_Pdf_Resource_Image_Tiff::TIFF_COMPRESSION_LZW:
$this->_filter = 'LZWDecode';
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...
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';
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:
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)) {
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($this->_imageDataLength)) {
throw new Zend_Pdf_Exception("TIFF: The image contained multiple data offsets but not multiple data lengths. Tiff may be corrupt.");
}
foreach($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 === '') {
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)) {
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;
}
}