jpeg.php

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                        // how much to read, as it won't work for files being read by http or ftp
                        // So instead read 1Mb at a time till EOF

                        $compressed_data = "";
                        do
                        {
                                $compressed_data .= network_safe_fread( $filehnd, 1048576 );
                        } while( ! feof( $filehnd ) );

                        // Strip off EOI and anything after
                        $EOI_pos = strpos( $compressed_data, "\xFF\xD9" );
                        $compressed_data = substr( $compressed_data, 0, $EOI_pos );
                }
                else
                {
                        // Not an SOS - Read the next two bytes - should be the segment marker for the next segment
                        $data = network_safe_fread( $filehnd, 2 );

                        // Check that the first byte of the two is 0xFF as it should be for a marker
                        if ( $data{0} != "\xFF" )
                        {
                                // Problem - NO FF foundclose file and return";
                                fclose($filehnd);
                                return;
                        }
                }
        }

        // Close File
        fclose($filehnd);

        // Alow the user to abort from now on
        ignore_user_abort(false);


        // Return the compressed data if it was found
        if ( $hit_compressed_image_data )
        {
                return $compressed_data;
        }
        else
        {
                return FALSE;
        }
}


/******************************************************************************
* End of Function:     get_jpeg_image_data
******************************************************************************/







/******************************************************************************
*
* Function:     Generate_JPEG_APP_Segment_HTML
*
* Description:  Generates html showing information about the Application (APP)
*               segments which are present in the JPEG file
*
* Parameters:   jpeg_header_data - the JPEG header data, as retrieved
*                                  from the get_jpeg_header_data function
*
* Returns:      output - A string containing the HTML
*
******************************************************************************/

function Generate_JPEG_APP_Segment_HTML( $jpeg_header_data )
{
        if ( $jpeg_header_data == FALSE )
        {
                return "";
        }


        // Write Heading
        $output = "<h2 class=\"JPEG_APP_Segments_Main_Heading\">Application Metadata Segments</h2>\n";

        // Create table
        $output .= "<table class=\"JPEG_APP_Segments_Table\" border=1>\n";


        // Cycle through each segment in the array

        foreach( $jpeg_header_data as $jpeg_header )
        {

                // Check if the segment is a APP segment

                if ( ( $jpeg_header['SegType'] >= 0xE0 ) && ( $jpeg_header['SegType'] <= 0xEF ) )
                {
                        // This is an APP segment

                        // Read APP Segment Name - a Null terminated string at the start of the segment
                        $seg_name = strtok($jpeg_header['SegData'], "\x00");

                        // Some Segment names are either too long or not meaningfull, so
                        // we should clean them up

                        if ( $seg_name == "http://ns.adobe.com/xap/1.0/" )
                        {
                                $seg_name = "XAP/RDF (\"http://ns.adobe.com/xap/1.0/\")";
                        }
                        elseif ( $seg_name == "Photoshop 3.0" )
                        {
                                $seg_name = "Photoshop IRB (\"Photoshop 3.0\")";
                        }
                        elseif ( ( strncmp ( $seg_name, "[picture info]", 14) == 0 ) ||
                                 ( strncmp ( $seg_name, "\x0a\x09\x09\x09\x09[picture info]", 19) == 0 ) )
                        {
                                $seg_name = "[picture info]";
                        }
                        elseif (  strncmp ( $seg_name, "Type=", 5) == 0 )
                        {
                                $seg_name = "Epson Info";
                        }
                        elseif ( ( strncmp ( $seg_name, "HHHHHHHHHHHHHHH", 15) == 0 ) ||
                                 ( strncmp ( $seg_name, "@s33", 5) == 0 ) )
                        {
                                $seg_name = "HP segment full of \"HHHHH\"";
                        }


                        // Clean the segment name so it doesn't cause problems with HTML
                        $seg_name = htmlentities( $seg_name );

                        // Output a Table row containing this APP segment
                        $output .= "<tr class=\"JPEG_APP_Segments_Table_Row\"><td class=\"JPEG_APP_Segments_Caption_Cell\">$seg_name</td><td class=\"JPEG_APP_Segments_Type_Cell\">" . $jpeg_header['SegName'] . "</td><td  class=\"JPEG_APP_Segments_Size_Cell\" align=\"right\">" . strlen( $jpeg_header['SegData']). " bytes</td></tr>\n";
                }
        }

        // Close the table
        $output .= "</table>\n";

        // Return the HTML
        return $output;
}


/******************************************************************************
* End of Function:     Generate_JPEG_APP_Segment_HTML
******************************************************************************/




/******************************************************************************
*
* Function:     network_safe_fread
*
* Description:  Retrieves data from a file. This function is required since
*               the fread function will not always return the requested number
*               of characters when reading from a network stream or pipe
*
* Parameters:   file_handle - the handle of a file to read from
*               length - the number of bytes requested
*
* Returns:      data - the data read from the file. may be less than the number
*                      requested if EOF was hit
*
******************************************************************************/

function network_safe_fread( $file_handle, $length )
{
        // Create blank string to receive data
        $data = "";

        // Keep reading data from the file until either EOF occurs or we have
        // retrieved the requested number of bytes

        while ( ( !feof( $file_handle ) ) && ( strlen($data) < $length ) )
        {
                $data .= fread( $file_handle, $length-strlen($data) );
        }

        // return the data read
        return $data;
}

/******************************************************************************
* End of Function:     network_safe_fread
******************************************************************************/




/******************************************************************************
* Global Variable:      JPEG_Segment_Names
*
* Contents:     The names of the JPEG segment markers, indexed by their marker number
*
******************************************************************************/

$GLOBALS[ "JPEG_Segment_Names" ] = array(

0xC0 =>  "SOF0",  0xC1 =>  "SOF1",  0xC2 =>  "SOF2",  0xC3 =>  "SOF4",
0xC5 =>  "SOF5",  0xC6 =>  "SOF6",  0xC7 =>  "SOF7",  0xC8 =>  "JPG",
0xC9 =>  "SOF9",  0xCA =>  "SOF10", 0xCB =>  "SOF11", 0xCD =>  "SOF13",
0xCE =>  "SOF14", 0xCF =>  "SOF15",
0xC4 =>  "DHT",   0xCC =>  "DAC",

0xD0 =>  "RST0",  0xD1 =>  "RST1",  0xD2 =>  "RST2",  0xD3 =>  "RST3",
0xD4 =>  "RST4",  0xD5 =>  "RST5",  0xD6 =>  "RST6",  0xD7 =>  "RST7",

0xD8 =>  "SOI",   0xD9 =>  "EOI",   0xDA =>  "SOS",   0xDB =>  "DQT",
0xDC =>  "DNL",   0xDD =>  "DRI",   0xDE =>  "DHP",   0xDF =>  "EXP",

0xE0 =>  "APP0",  0xE1 =>  "APP1",  0xE2 =>  "APP2",  0xE3 =>  "APP3",
0xE4 =>  "APP4",  0xE5 =>  "APP5",  0xE6 =>  "APP6",  0xE7 =>  "APP7",
0xE8 =>  "APP8",  0xE9 =>  "APP9",  0xEA =>  "APP10", 0xEB =>  "APP11",
0xEC =>  "APP12", 0xED =>  "APP13", 0xEE =>  "APP14", 0xEF =>  "APP15",


0xF0 =>  "JPG0",  0xF1 =>  "JPG1",  0xF2 =>  "JPG2",  0xF3 =>  "JPG3",
0xF4 =>  "JPG4",  0xF5 =>  "JPG5",  0xF6 =>  "JPG6",  0xF7 =>  "JPG7",
0xF8 =>  "JPG8",  0xF9 =>  "JPG9",  0xFA =>  "JPG10", 0xFB =>  "JPG11",
0xFC =>  "JPG12", 0xFD =>  "JPG13",

0xFE =>  "COM",   0x01 =>  "TEM",   0x02 =>  "RES",

);

/******************************************************************************
* End of Global Variable:     JPEG_Segment_Names
******************************************************************************/


/******************************************************************************
* Global Variable:      JPEG_Segment_Descriptions
*
* Contents:     The descriptions of the JPEG segment markers, indexed by their marker number
*
******************************************************************************/

$GLOBALS[ "JPEG_Segment_Descriptions" ] = array(

/* JIF Marker byte pairs in JPEG Interchange Format sequence */
0xC0 => "Start Of Frame (SOF) Huffman  - Baseline DCT",
0xC1 =>  "Start Of Frame (SOF) Huffman  - Extended sequential DCT",
0xC2 =>  "Start Of Frame Huffman  - Progressive DCT (SOF2)",
0xC3 =>  "Start Of Frame Huffman  - Spatial (sequential) lossless (SOF3)",
0xC5 =>  "Start Of Frame Huffman  - Differential sequential DCT (SOF5)",
0xC6 =>  "Start Of Frame Huffman  - Differential progressive DCT (SOF6)",
0xC7 =>  "Start Of Frame Huffman  - Differential spatial (SOF7)",
0xC8 =>  "Start Of Frame Arithmetic - Reserved for JPEG extensions (JPG)",
0xC9 =>  "Start Of Frame Arithmetic - Extended sequential DCT (SOF9)",
0xCA =>  "Start Of Frame Arithmetic - Progressive DCT (SOF10)",
0xCB =>  "Start Of Frame Arithmetic - Spatial (sequential) lossless (SOF11)",
0xCD =>  "Start Of Frame Arithmetic - Differential sequential DCT (SOF13)",
0xCE =>  "Start Of Frame Arithmetic - Differential progressive DCT (SOF14)",
0xCF =>  "Start Of Frame Arithmetic - Differential spatial (SOF15)",
0xC4 =>  "Define Huffman Table(s) (DHT)",
0xCC =>  "Define Arithmetic coding conditioning(s) (DAC)",

0xD0 =>  "Restart with modulo 8 count 0 (RST0)",
0xD1 =>  "Restart with modulo 8 count 1 (RST1)",
0xD2 =>  "Restart with modulo 8 count 2 (RST2)",
0xD3 =>  "Restart with modulo 8 count 3 (RST3)",
0xD4 =>  "Restart with modulo 8 count 4 (RST4)",
0xD5 =>  "Restart with modulo 8 count 5 (RST5)",
0xD6 =>  "Restart with modulo 8 count 6 (RST6)",
0xD7 =>  "Restart with modulo 8 count 7 (RST7)",

0xD8 =>  "Start of Image (SOI)",
0xD9 =>  "End of Image (EOI)",
0xDA =>  "Start of Scan (SOS)",
0xDB =>  "Define quantization Table(s) (DQT)",
0xDC =>  "Define Number of Lines (DNL)",
0xDD =>  "Define Restart Interval (DRI)",
0xDE =>  "Define Hierarchical progression (DHP)",
0xDF =>  "Expand Reference Component(s) (EXP)",

0xE0 =>  "Application Field 0 (APP0) - usually JFIF or JFXX",
0xE1 =>  "Application Field 1 (APP1) - usually EXIF or XMP/RDF",
0xE2 =>  "Application Field 2 (APP2) - usually Flashpix",
0xE3 =>  "Application Field 3 (APP3)",
0xE4 =>  "Application Field 4 (APP4)",
0xE5 =>  "Application Field 5 (APP5)",
0xE6 =>  "Application Field 6 (APP6)",
0xE7 =>  "Application Field 7 (APP7)",

0xE8 =>  "Application Field 8 (APP8)",
0xE9 =>  "Application Field 9 (APP9)",
0xEA =>  "Application Field 10 (APP10)",
0xEB =>  "Application Field 11 (APP11)",
0xEC =>  "Application Field 12 (APP12) - usually [picture info]",
0xED =>  "Application Field 13 (APP13) - usually photoshop IRB / IPTC",
0xEE =>  "Application Field 14 (APP14)",
0xEF =>  "Application Field 15 (APP15)",


0xF0 =>  "Reserved for JPEG extensions (JPG0)",
0xF1 =>  "Reserved for JPEG extensions (JPG1)",
0xF2 =>  "Reserved for JPEG extensions (JPG2)",
0xF3 =>  "Reserved for JPEG extensions (JPG3)",
0xF4 =>  "Reserved for JPEG extensions (JPG4)",
0xF5 =>  "Reserved for JPEG extensions (JPG5)",
0xF6 =>  "Reserved for JPEG extensions (JPG6)",
0xF7 =>  "Reserved for JPEG extensions (JPG7)",
0xF8 =>  "Reserved for JPEG extensions (JPG8)",
0xF9 =>  "Reserved for JPEG extensions (JPG9)",
0xFA =>  "Reserved for JPEG extensions (JPG10)",
0xFB =>  "Reserved for JPEG extensions (JPG11)",
0xFC =>  "Reserved for JPEG extensions (JPG12)",
0xFD =>  "Reserved for JPEG extensions (JPG13)",

0xFE =>  "Comment (COM)",
0x01 =>  "For temp private use arith code (TEM)",
0x02 =>  "Reserved (RES)",

);

/******************************************************************************
* End of Global Variable:     JPEG_Segment_Descriptions
******************************************************************************/



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