photoshop_irb.php

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                                                $output_str .= "Display units for Image Width = Unknown Value (". $ResInfo['widthUnit'] .")\n";
                                        }

                                        if ( $ResInfo['heightUnit'] == 1 )
                                        {
                                                $output_str .= "Display units for Image Height = Inches";
                                        }
                                        elseif ( $ResInfo['heightUnit'] == 2 )
                                        {
                                                $output_str .= "Display units for Image Height = Centimetres";
                                        }
                                        elseif ( $ResInfo['heightUnit'] == 3 )
                                        {
                                                $output_str .= "Display units for Image Height = Points";
                                        }
                                        elseif ( $ResInfo['heightUnit'] == 4 )
                                        {
                                                $output_str .= "Display units for Image Height = Picas";
                                        }
                                        elseif ( $ResInfo['heightUnit'] == 5 )
                                        {
                                                $output_str .= "Display units for Image Height = Columns";
                                        }
                                        else
                                        {
                                                $output_str .= "Display units for Image Height = Unknown Value (". $ResInfo['heightUnit'] .")";
                                        }
                                        $output_str .= "</pre></td></tr>\n";
                                        break;

                                default : // All other records
                                        $output_str .= "<tr class=\"Photoshop_Table_Row\"><td class=\"Photoshop_Caption_Cell\">$Resource_Name</td><td class=\"Photoshop_Value_Cell\">RESOURCE DECODING NOT IMPLEMENTED YET<BR>" . strlen( $IRB_Resource['ResData'] ) . " bytes</td></tr>\n";

                        }

                }

                // Add the table end to the HTML
                $output_str .= "</table>\n";

                // Add any secondary output to the HTML
                $output_str .= $secondary_output_str;

        }

        // Return the HTML
        return $output_str;
}

/******************************************************************************
* End of Function:     Interpret_IRB_to_HTML
******************************************************************************/






/******************************************************************************
*
*         INTERNAL FUNCTIONS
*
******************************************************************************/







/******************************************************************************
*
* Function:     unpack_Photoshop_IRB_Data
*
* Description:  Extracts Photoshop Information Resource Block (IRB) information
*               from a binary string containing the IRB, as read from a file
*
* Parameters:   IRB_Data - The binary string containing the IRB
*
* Returns:      IRBdata - The array of Photoshop IRB records
*
******************************************************************************/

function unpack_Photoshop_IRB_Data( $IRB_Data )
{
        $pos = 0;

        // Cycle through the IRB and extract its records - Records are started with 8BIM, so cycle until no more instances of 8BIM can be found
        while ( ( $pos < strlen( $IRB_Data ) ) && ( ($pos = strpos( $IRB_Data, "8BIM", $pos) ) !== FALSE ) )
        {
                // Skip the position over the 8BIM characters
                $pos += 4;

                // Next two characters are the record ID - denoting what type of record it is.
                $ID = ord( $IRB_Data{ $pos } ) * 256 + ord( $IRB_Data{ $pos +1 } );

                // Skip the positionover the two record ID characters
                $pos += 2;

                // Next comes a Record Name - usually not used, but it should be a null terminated string, padded with 0x00 to be an even length
                $namestartpos = $pos;

                // Change: Fixed processing of embedded resource names, as of revision 1.10

                // NOTE: Photoshop does not process resource names according to the standard :
                // "Adobe Photoshop 6.0 File Formats Specification, Version 6.0, Release 2, November 2000"
                //
                // The resource name is actually formatted as follows:
                // One byte name length, followed by the null terminated ascii name string.
                // The field is then padded with a Null character if required, to ensure that the
                // total length of the name length and name is even.

                // Name - process it
                // Get the length
                $namelen = ord ( $IRB_Data{ $namestartpos } );

                // Total length of name and length info must be even, hence name length must be odd
                // Check if the name length is even,
                if ( $namelen % 2 == 0 )
                {
                        // add one to length to make it odd
                        $namelen ++;
                }
                // Extract the name
                $resembeddedname = trim( substr ( $IRB_Data, $namestartpos+1,  $namelen) );
                $pos += $namelen + 1;


                // Next is a four byte size field indicating the size in bytes of the record's data  - MSB first
                $datasize =     ord( $IRB_Data{ $pos } ) * 16777216 + ord( $IRB_Data{ $pos + 1 } ) * 65536 +
                                ord( $IRB_Data{ $pos + 2 } ) * 256 + ord( $IRB_Data{ $pos + 3 } );
                $pos += 4;

                // The record is stored padded with 0x00 characters to make the size even, so we need to calculate the stored size
                $storedsize =  $datasize + ($datasize % 2);

                $resdata = substr ( $IRB_Data, $pos, $datasize );

                // Get the description for this resource
                // Check if this is a Path information Resource, since they have a range of ID's
                if ( ( $ID >= 0x07D0 ) && ( $ID <= 0x0BB6 ) )
                {
                        $ResDesc = "ID Info : Path Information (saved paths).";
                }
                else
                {
                        if ( array_key_exists( $ID, $GLOBALS[ "Photoshop_ID_Descriptions" ] ) )
                        {
                                $ResDesc = $GLOBALS[ "Photoshop_ID_Descriptions" ][ $ID ];
                        }
                        else
                        {
                                $ResDesc = "";
                        }
                }

                // Get the Name of the Resource
                if ( array_key_exists( $ID, $GLOBALS[ "Photoshop_ID_Names" ] ) )
                {
                        $ResName = $GLOBALS['Photoshop_ID_Names'][ $ID ];
                }
                else
                {
                        $ResName = "";
                }


                // Store the Resource in the array to be returned

                $IRB_Array[] = array(     "ResID" => $ID,
                                        "ResName" => $ResName,
                                        "ResDesc" => $ResDesc,
                                        "ResEmbeddedName" => $resembeddedname,
                                        "ResData" => $resdata );

                // Jump over the data to the next record
                $pos += $storedsize;
        }

        // Return the array created
        return $IRB_Array;
}

/******************************************************************************
* End of Function:     unpack_Photoshop_IRB_Data
******************************************************************************/











/******************************************************************************
*
* Function:     pack_Photoshop_IRB_Data
*
* Description:  Packs a Photoshop Information Resource Block (IRB) array into it's
*               binary form, which can be written to a file
*
* Parameters:   IRB_data - an Photoshop IRB array to be converted. Should be in
*                          the same format as received from get_Photoshop_IRB
*
* Returns:      packed_IRB_data - the binary string of packed IRB data
*
******************************************************************************/

function pack_Photoshop_IRB_Data( $IRB_data )
{
        $packed_IRB_data = "";

        // Cycle through each resource in the IRB,
        foreach ($IRB_data as $resource)
        {

                // Change: Fix to avoid creating blank resources, as of revision 1.10

                // Check if there is actually any data for this resource
                if( strlen( $resource['ResData'] ) == 0 )
                {
                        // No data