function Encode_PIM($tag, $Byte_Align)
{
// Create a string to receive the packed data
$packed_data = "";
// Check that this tag is for Print Image Matching Info
if ($tag['Type'] == "PIM") {
// Check that the tag has been decoded - otherwise we don't need to do anything
if (is_array($tag['Data']) && count($tag['Data']) > 0) {
// Add the header to the packed data
$packed_data .= "PrintIM";
// Add the version to the packed data
$packed_data .= $tag['Data']['Version'] . "";
// Create a string to receive the tag data
$tag_data_str = "";
// Cycle through each tag
$tag_count = 0;
foreach ($tag['Data'] as $key => $curr_tag) {
// Make sure this is a tag and not supplementary info
if (is_numeric($key)) {
// Count how many tags are created
$tag_count++;
// Add the tag number to the packed tag data
$tag_data_str .= put_IFD_Data_Type($curr_tag['Tag Number'], 3, $Byte_Align);
// Add the tag data to the packed tag data
$tag_data_str .= $curr_tag['Data'];
}
}
// Add the tag count to the packed data
$packed_data .= put_IFD_Data_Type($tag_count, 3, $Byte_Align);
// Add the packed tag data to the packed data
$packed_data .= $tag_data_str;
}
}
// Return the resulting packed data
return $packed_data;
}
function get_IFD_Packed_Data($ifd_data, $IFD_offset, $Byte_Align, $Another_IFD)
{
$ifd_body_str = "";
$ifd_data_str = "";
$Tag_Definitions_Name = $ifd_data['Tags Name'];
// Count the Tags in this IFD
$tag_count = 0;
foreach ($ifd_data as $key => $tag) {
// Make sure we only count the Tags, not other information keys
if (is_numeric($key)) {
$tag_count++;
}
}
// Add the Tag count to the packed data
$packed_data = put_IFD_Data_Type($tag_count, 3, $Byte_Align);
// Calculate the total length of the IFD (without the offset data)
$IFD_len = 2 + $tag_count * 12 + 4;
// Cycle through each tag
foreach ($ifd_data as $key => $tag) {
// Make sure this is a tag, not another information key
if (is_numeric($key)) {
// Add the tag number to the packed data
$ifd_body_str .= put_IFD_Data_Type($tag['Tag Number'], 3, $Byte_Align);
// Add the Data type to the packed data
$ifd_body_str .= put_IFD_Data_Type($tag['Data Type'], 3, $Byte_Align);
// Check if this is a Print Image Matching entry
if ($tag['Type'] == "PIM") {
// This is a Print Image Matching entry,
// encode it
$data = Encode_PIM($tag, $Byte_Align);
} else {
if (($Tag_Definitions_Name == "EXIF" || $Tag_Definitions_Name == "TIFF") && $tag['Tag Number'] == 33723) {
// This is a IPTC/NAA Record, encode it
$data = put_IPTC($tag['Data']);
} else {
if (($Tag_Definitions_Name == "EXIF" || $Tag_Definitions_Name == "TIFF") && $tag['Tag Number'] == 700) {
// This is a XMP Record, encode it
$data = write_XMP_array_to_text($tag['Data']);
} else {
if (($Tag_Definitions_Name == "EXIF" || $Tag_Definitions_Name == "TIFF") && $tag['Tag Number'] == 34377) {
// This is a Photoshop IRB Record, encode it
$data = pack_Photoshop_IRB_Data($tag['Data']);
} else {
if ($tag['Tag Number'] == 513 && $Tag_Definitions_Name == "TIFF") {
// The Exif Thumbnail Offset is a pointer but of type Long, not Unknown
// Hence we need to put the data into the packed string separately
// Calculate the thumbnail offset
$data_offset = $IFD_offset + $IFD_len + strlen($ifd_data_str);
// Create the Offset for the IFD
$data = put_IFD_Data_Type($data_offset, 4, $Byte_Align);
// Store the thumbnail
$ifd_data_str .= $tag['Data'];
} else {
if ($tag['Tag Number'] == 514 && $Tag_Definitions_Name == "TIFF") {
// Encode the Thumbnail Length
$data = put_IFD_Data_Type(strlen($ifd_data[513]['Data']), 4, $Byte_Align);
} else {
if ($tag['Type'] == "SubIFD") {
// This is a Sub-IFD
// Calculate the offset to the start of the Sub-IFD
$data_offset = $IFD_offset + $IFD_len + strlen($ifd_data_str);
// Get the packed data for the IFD chain as the data for this tag
$data = get_IFD_Array_Packed_Data($tag['Data'], $data_offset, $Byte_Align);
} else {
// Not a special tag
// Create a string to receive the data
$data = "";
// Check if this is a type Unknown tag
if ($tag['Data Type'] != 7) {
// NOT type Unknown
// Cycle through each data value and add it to the data string
foreach ($tag['Data'] as $data_val) {
$data .= put_IFD_Data_Type($data_val, $tag['Data Type'], $Byte_Align);
}
} else {
// This is a type Unknown - just add the data as is to the data string
$data .= $tag['Data'];
}
}
}
}
}
}
}
}
// Pad the data string out to at least 4 bytes
$data = str_pad($data, 4, "");
// Check if the data type is an ASCII String or type Unknown
if ($tag['Data Type'] == 2 || $tag['Data Type'] == 7) {
// This is an ASCII String or type Unknown
// Add the Length of the string to the packed data as the Count
$ifd_body_str .= put_IFD_Data_Type(strlen($data), 4, $Byte_Align);
} else {
// Add the array count to the packed data as the Count
$ifd_body_str .= put_IFD_Data_Type(count($tag['Data']), 4, $Byte_Align);
}
// Check if the data is over 4 bytes long
if (strlen($data) > 4) {
// Data is longer than 4 bytes - it needs to be offset
// Check if this entry is the Maker Note
if ($Tag_Definitions_Name == "EXIF" && $tag['Tag Number'] == 37500) {
// This is the makernote - It will have already been stored
// at its original offset to help preserve it
// all we need to do is add the Offset to the IFD packed data
$data_offset = $tag['Offset'];
$ifd_body_str .= put_IFD_Data_Type($data_offset, 4, $Byte_Align);
} else {
// This is NOT the makernote
// Calculate the data offset
$data_offset = $IFD_offset + $IFD_len + strlen($ifd_data_str);
// Add the offset to the IFD packed data
$ifd_body_str .= put_IFD_Data_Type($data_offset, 4, $Byte_Align);
// Add the data to the offset packed data
$ifd_data_str .= $data;
}
} else {
// Data is less than or equal to 4 bytes - Add it to the packed IFD data as is
$ifd_body_str .= $data;
}
}
}
// Assemble the IFD body onto the packed data
$packed_data .= $ifd_body_str;
// Check if there is another IFD after this one
if ($Another_IFD === TRUE) {
// There is another IFD after this
// Calculate the Next-IFD offset so that it goes immediately after this IFD
$next_ifd_offset = $IFD_offset + $IFD_len + strlen($ifd_data_str);
} else {
// There is NO IFD after this - indicate with offset=0
$next_ifd_offset = 0;
}
// Add the Next-IFD offset to the packed data
$packed_data .= put_IFD_Data_Type($next_ifd_offset, 4, $Byte_Align);
// Add the offset data to the packed data
$packed_data .= $ifd_data_str;
// Return the resulting packed data
return $packed_data;
}
