tiff.php

Bug tracker, and reporter.

                    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;
    }
}