/**
* 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'];
}
/**
* Object constructor
*
* @param string $imageFileName
* @throws Zend_Pdf_Exception
*/
public function __construct($imageFileName)
{
if (($imageInfo = getimagesize($imageFileName)) === false) {
throw new Zend_Pdf_Exception('Corrupted image or image doesn\'t exist.');
}
if ($imageInfo[2] != IMAGETYPE_TIFF_II && $imageInfo[2] != IMAGETYPE_TIFF_MM) {
throw new Zend_Pdf_Exception('ImageType is not TIFF');
}
parent::__construct();
/* This needs to be fixed
switch ($imageInfo['channels']) {
case 3:
$colorSpace = 'DeviceRGB';
break;
case 4:
$colorSpace = 'DeviceCMYK';
break;
default:
$colorSpace = 'DeviceGray';
break;
}
*/
/*
This is a temporary hack - this needs to be read from the tiff file format.
IMAGICK pecl extension contains imagick_getcolorspace but introducing another
extension dependency is probably bad.
*/
$colorSpace = 'DeviceRGB';
$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']);
//This is also a temporary hack - Corresponds imagick_getimagedepth
$imageDictionary->BitsPerComponent = new Zend_Pdf_Element_Numeric(8);
if (($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();
}
/**
* 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_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_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_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($blue));
break;
case Zend_Pdf_Image_Png::PNG_CHANNEL_INDEXED:
//Find the first transparent color in the index, we will mask that. (This is a bit of a hack. This should be a SMask and mask all entries values).
if (($trnsIdx = strpos($trnsData, chr(0))) !== false) {
$transparencyData = array(new Zend_Pdf_Element_Numeric($trnsIdx), new Zend_Pdf_Element_Numeric($trnsIdx));
}
break;
case Zend_Pdf_Image_Png::PNG_CHANNEL_GRAY_ALPHA:
// Fall through to the next case
// Fall through to the next case
case Zend_Pdf_Image_Png::PNG_CHANNEL_RGB_ALPHA:
throw new Zend_Pdf_Exception("tRNS chunk illegal for Alpha Channel Images");
break;
}
fseek($imageFile, 4, SEEK_CUR);
//4 Byte Ending Sequence
break;
case 'IEND':
break 2;
//End the loop too
//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_Image_Png::PNG_CHANNEL_RGB:
$colorSpace = new Zend_Pdf_Element_Name('DeviceRGB');
break;
case Zend_Pdf_Image_Png::PNG_CHANNEL_GRAY:
$colorSpace = new Zend_Pdf_Element_Name('DeviceGray');
break;
case Zend_Pdf_Image_Png::PNG_CHANNEL_INDEXED:
if (empty($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[] = $paletteObject;
break;
case Zend_Pdf_Image_Png::PNG_CHANNEL_GRAY_ALPHA:
/*
* To decode PNG's with alpha data we must create two images from one. One image will contain the Gray data
* the other will contain the Gray transparency overlay data. The former will become the object data and the latter
* will become the Shadow Mask (SMask).
*/
if ($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 = new Zend_Pdf_ElementFactory(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 = $imageDataTmp;
//Overwrite image data with the gray channel without alpha
break;
case Zend_Pdf_Image_Png::PNG_CHANNEL_RGB_ALPHA:
/*
* To decode PNG's with alpha data we must create two images from one. One image will contain the RGB data
* the other will contain the Gray transparency overlay data. The former will become the object data and the latter
* will become the Shadow Mask (SMask).
*/
if ($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 = new Zend_Pdf_ElementFactory(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_Image_Png::PNG_CHANNEL_RGB || $color == Zend_Pdf_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();
}
}
/**
* 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 '{$imageFileName}' file for reading.");
}
parent::__construct();
//Check if the file is a PNG
fseek($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));
if (ord(fread($imageFile, 1)) != Zend_Pdf_Image_PNG::PNG_COMPRESSION_DEFAULT_STRATEGY) {
//TODO: Add compression conversions
throw new Zend_Pdf_Exception("Only the default compression strategy is currently supported.");
}
if (ord(fread($imageFile, 1)) != Zend_Pdf_Image_PNG::PNG_FILTER_NONE) {
//TODO: Support PNG Filtering
throw new Zend_Pdf_Exception("Filtering methods are not currently supported. ");
}
if (ord(fread($imageFile, 1)) != Zend_Pdf_Image_PNG::PNG_INTERLACING_DISABLED) {
//TODO: Support Interlacing
throw new Zend_Pdf_Exception("Only non-interlaced images are currently supported.");
}
fseek($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)) {
$chunkLengthtmp = unpack('Ni', $chunkLengthBytes);
$chunkLength = $chunkLengthtmp['i'];
$chunkType = fread($imageFile, 4);
switch ($chunkType) {
//TODO: Support all PNG chunks
case 'IDAT':
//Image Data
$imageData .= fread($imageFile, $chunkLength);
fseek($imageFile, 4, SEEK_CUR);
break;
case 'PLTE':
//Palette
if ($color != Zend_Pdf_Image_PNG::PNG_CHANNEL_INDEXED) {
throw new Zend_Pdf_Exception("Only indexed color PNG's can contain palette entries.");
}
$paletteData = fread($imageFile, $chunkLength);
fseek($imageFile, 4, SEEK_CUR);
break;
case 'tRNS':
//Basic (non-alpha channel) transparency. (untested)
switch ($color) {
case Zend_Pdf_Image_PNG::PNG_CHANNEL_GRAY:
$baseColor = unpack('n', fread($imageFile, 2));
$transparencyData = array($baseColor['n']);
fseek($imageFile, $chunkLength - 2, SEEK_CUR);
break;
case Zend_Pdf_Image_PNG::PNG_CHANNEL_RGB:
$red = unpack('n', fread($imageFile, 2));
$green = unpack('n', fread($imageFile, 2));
$blue = unpack('n', fread($imageFile, 2));
$transparencyData = array($red['n'], $green['n'], $blue['n']);
fseek($imageFile, $chunkLength - 6, SEEK_CUR);
break;
case Zend_Pdf_Image_PNG::PNG_CHANNEL_INDEXED:
//TODO: Read "For color type 3 (indexed color), the tRNS chunk contains a series of one-byte alpha values, corresponding to entries in the PLTE chunk"
fseek($imageFile, $chunkLength, SEEK_CUR);
throw new Zend_Pdf_Exception("tRNS chunk not yet supported for INDEXED color images..");
break;
case Zend_Pdf_Image_PNG::PNG_CHANNEL_GRAY_ALPHA:
// Fall through to the next case
// Fall through to the next case
case Zend_Pdf_Image_PNG::PNG_CHANNEL_RGB_ALPHA:
fseek($imageFile, $chunkLength, SEEK_CUR);
throw new Zend_Pdf_Exception("tRNS chunk illegal for Alpha Channel Images");
break;
}
fseek($imageFile, 4, SEEK_CUR);
//4 Byte Ending Sequence
break;
case 'IEND':
break 2;
//End the loop too
//End the loop too
default:
fseek($imageFile, $chunkLength + 4, SEEK_CUR);
//Skip the section
break;
}
}
switch ($color) {
case Zend_Pdf_Image_PNG::PNG_CHANNEL_RGB:
$colorSpace = new Zend_Pdf_Element_Name('DeviceRGB');
break;
case Zend_Pdf_Image_PNG::PNG_CHANNEL_GRAY:
$colorSpace = new Zend_Pdf_Element_Name('DeviceGray');
break;
case Zend_Pdf_Image_PNG::PNG_CHANNEL_INDEXED:
$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_Image_PNG::PNG_CHANNEL_GRAY_ALPHA:
/* Same problem as RGB+Alpha */
throw new Zend_Pdf_Exception("PNGs with GRAYSCALE + Alpha are not yet supported");
break;
case Zend_Pdf_Image_PNG::PNG_CHANNEL_RGB_ALPHA:
/*
* Looked into this, im not sure how exactly, but to do this conversion; we
* must remove the alpha channel from the data stream, and place it into a SMask
* format with its own stream.
*
* This is probably the most common and therefore important mode to get working.
*/
$colorSpace = new Zend_Pdf_Element_Name('DeviceRGB');
throw new Zend_Pdf_Exception("4 Channel RGB+Alpha Images Are Not Supported Yet. ");
break;
default:
throw new Zend_Pdf_Exception("PNG Corruption: Invalid color space.");
}
if (empty($imageData)) {
throw new Zend_Pdf_Exception("Corrupt PNG Image. Manditory IDAT chunk not found.");
}
fclose($imageFile);
/* This array adds the Predictor which must be > 10 (15=optimal) for PNG parsing */
$decodeParms = array();
$decodeParms['Predictor'] = new Zend_Pdf_Element_Numeric('15');
$decodeParms['Columns'] = new Zend_Pdf_Element_Numeric($width);
$decodeParms['Colors'] = new Zend_Pdf_Element_Numeric($color == 2 ? 3 : 1);
$decodeParms['BitsPerComponent'] = new Zend_Pdf_Element_Numeric($bits);
$imageDictionary = $this->_resource->dictionary;
$imageDictionary->Width = new Zend_Pdf_Element_Numeric($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');
$imageDictionary->DecodeParms = new Zend_Pdf_Element_Dictionary($decodeParms);
if (!empty($smaskData)) {
$smaskStream = $this->_objectFactory->newStreamObject($smaskData);
$smaskStream->dictionary->Filter = new Zend_Pdf_Element_Name('FlateDecode');
$imageDictionary->SMask = $smaskStream;
}
if (!empty($transparencyData)) {
$imageDictionary->Mask = new Zend_Pdf_Element_Array($transparencyData);
}
//Include only the image IDAT section data.
$this->_resource->value = $imageData;
//Skip double compression
$this->_resource->skipFilters();
}
/**
* 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') {
$this->_endianType = Zend_Pdf_Image_TIFF::TIFF_ENDIAN_LITTLE;
} else {
if ($byteOrderIndicator == 'MM') {
$this->_endianType = Zend_Pdf_Image_TIFF::TIFF_ENDIAN_BIG;
} else {
throw new Zend_Pdf_Exception("Not a tiff file or Tiff corrupt. No byte order indication found");
}
}
$version = $this->unpackBytes(Zend_Pdf_Image_TIFF::UNPACK_TYPE_SHORT, fread($imageFile, 2));
if ($version != 42) {
throw new Zend_Pdf_Exception("Not a tiff file or Tiff corrupt. Incorrect version number.");
}
$ifdOffset = $this->unpackBytes(Zend_Pdf_Image_TIFF::UNPACK_TYPE_LONG, fread($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 = $this->unpackBytes(Zend_Pdf_Image_TIFF::UNPACK_TYPE_SHORT, fread($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 = $this->unpackBytes(Zend_Pdf_Image_TIFF::UNPACK_TYPE_SHORT, fread($imageFile, 2));
$fieldType = $this->unpackBytes(Zend_Pdf_Image_TIFF::UNPACK_TYPE_SHORT, fread($imageFile, 2));
$valueCount = $this->unpackBytes(Zend_Pdf_Image_TIFF::UNPACK_TYPE_LONG, fread($imageFile, 4));
switch ($fieldType) {
case Zend_Pdf_Image_TIFF::TIFF_FIELD_TYPE_BYTE:
$fieldLength = $valueCount;
break;
case Zend_Pdf_Image_TIFF::TIFF_FIELD_TYPE_ASCII:
$fieldLength = $valueCount;
break;
case Zend_Pdf_Image_TIFF::TIFF_FIELD_TYPE_SHORT:
$fieldLength = $valueCount * 2;
break;
case Zend_Pdf_Image_TIFF::TIFF_FIELD_TYPE_LONG:
$fieldLength = $valueCount * 4;
break;
case Zend_Pdf_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_Image_TIFF::TIFF_FIELD_TYPE_BYTE:
$value = $this->unpackBytes(Zend_Pdf_Image_TIFF::UNPACK_TYPE_BYTE, $offsetBytes);
break;
case Zend_Pdf_Image_TIFF::TIFF_FIELD_TYPE_ASCII:
//Fall through to next case
//Fall through to next case
case Zend_Pdf_Image_TIFF::TIFF_FIELD_TYPE_LONG:
$value = $this->unpackBytes(Zend_Pdf_Image_TIFF::UNPACK_TYPE_LONG, $offsetBytes);
break;
case Zend_Pdf_Image_TIFF::TIFF_FIELD_TYPE_SHORT:
//Fall through to next case
//Fall through to next case
default:
$value = $this->unpackBytes(Zend_Pdf_Image_TIFF::UNPACK_TYPE_SHORT, $offsetBytes);
}
} else {
$refOffset = $this->unpackBytes(Zend_Pdf_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_Image_TIFF::TIFF_TAG_IMAGE_WIDTH:
$this->_width = $value;
break;
case Zend_Pdf_Image_TIFF::TIFF_TAG_IMAGE_LENGTH:
$this->_height = $value;
break;
case Zend_Pdf_Image_TIFF::TIFF_TAG_BITS_PER_SAMPLE:
if ($valueCount > 1) {
$fp = ftell($imageFile);
fseek($imageFile, $refOffset, SEEK_SET);
$this->_bitsPerSample = $this->unpackBytes(Zend_Pdf_Image_TIFF::UNPACK_TYPE_SHORT, fread($imageFile, 2));
fseek($imageFile, $fp, SEEK_SET);
} else {
$this->_bitsPerSample = $value;
}
break;
case Zend_Pdf_Image_TIFF::TIFF_TAG_COMPRESSION:
$this->_compression = $value;
switch ($value) {
case Zend_Pdf_Image_TIFF::TIFF_COMPRESSION_UNCOMPRESSED:
$this->_filter = 'None';
break;
case Zend_Pdf_Image_TIFF::TIFF_COMPRESSION_CCITT1D:
//Fall through to next case
//Fall through to next case
case Zend_Pdf_Image_TIFF::TIFF_COMPRESSION_GROUP_3_FAX:
//Fall through to next case
//Fall through to next case
case Zend_Pdf_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_Image_TIFF::TIFF_COMPRESSION_LZW:
$this->_filter = 'LZWDecode';
throw new Zend_Pdf_Exception("LZWDecode Compression Mode Not Currently Supported");
break;
case Zend_Pdf_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_Image_TIFF::TIFF_COMPRESSION_FLATE:
//fall through to next case
//fall through to next case
case Zend_Pdf_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_Image_TIFF::TIFF_COMPRESSION_PACKBITS:
$this->_filter = 'RunLengthDecode';
break;
}
break;
case Zend_Pdf_Image_TIFF::TIFF_TAG_PHOTOMETRIC_INTERPRETATION:
$this->_colorCode = $value;
$this->_whiteIsZero = false;
$this->_blackIsZero = false;
switch ($value) {
case Zend_Pdf_Image_TIFF::TIFF_PHOTOMETRIC_INTERPRETATION_WHITE_IS_ZERO:
$this->_whiteIsZero = true;
$this->_colorSpace = 'DeviceGray';
break;
case Zend_Pdf_Image_TIFF::TIFF_PHOTOMETRIC_INTERPRETATION_BLACK_IS_ZERO:
$this->_blackIsZero = true;
$this->_colorSpace = 'DeviceGray';
break;
case Zend_Pdf_Image_TIFF::TIFF_PHOTOMETRIC_INTERPRETATION_YCBCR:
//fall through to next case
//fall through to next case
case Zend_Pdf_Image_TIFF::TIFF_PHOTOMETRIC_INTERPRETATION_RGB:
$this->_colorSpace = 'DeviceRGB';
break;
case Zend_Pdf_Image_TIFF::TIFF_PHOTOMETRIC_INTERPRETATION_RGB_INDEXED:
$this->_colorSpace = 'Indexed';
break;
case Zend_Pdf_Image_TIFF::TIFF_PHOTOMETRIC_INTERPRETATION_CMYK:
$this->_colorSpace = 'DeviceCMYK';
break;
case Zend_Pdf_Image_TIFF::TIFF_PHOTOMETRIC_INTERPRETATION_CIELAB:
$this->_colorSpace = 'Lab';
break;
default:
throw new Zend_Pdf_Exception('TIFF: Unknown or Unsupported Color Type: ' . $value);
}
break;
case Zend_Pdf_Image_TIFF::TIFF_TAG_STRIP_OFFSETS:
if ($valueCount > 1) {
$format = $this->_endianType == Zend_Pdf_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 = $value;
}
break;
case Zend_Pdf_Image_TIFF::TIFF_TAG_STRIP_BYTE_COUNTS:
if ($valueCount > 1) {
$format = $this->_endianType == Zend_Pdf_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 = $this->unpackBytes(Zend_Pdf_Image_TIFF::UNPACK_TYPE_LONG, fread($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();
}
