Class MLA (Media Library Assistant) PDF extracts legacy and XMP meta data from PDF files
_parse_pdf_xref_subsection( $xref_section, $offset, $object_id, $count) : void
Parse a cross-reference table subsection into the array of indirect object definitions
A cross-reference subsection is a sequence of 20-byte entries, each with offset and generation values.
| $xref_section | ||
| $offset | ||
| $object_id | ||
| $count |
_parse_pdf_xref_section( $file_name, $file_offset) : integer
Parse a cross-reference table section into the array of indirect object definitions
Creates the array of indirect object offsets and lengths
| $file_name | ||
| $file_offset |
length of the section
_parse_pdf_xref_stream( $file_name, $file_offset, $entry_parms_string) : integer
Parse a cross-reference steam into the array of indirect object definitions
Creates the array of indirect object offsets and lengths
| $file_name | ||
| $file_offset | ||
| $entry_parms_string |
length of the stream
_find_pdf_indirect_dictionary( $file_name, $object, $generation, $instance = NULL) : mixed
Find the offset, length and contents of an indirect object containing a dictionary
The function searches the entire file, if necessary, to find the last/most recent copy of the object. This is required because Adobe Acrobat does NOT increment the generation number when it reuses an object.
| $file_name | ||
| $object | ||
| $generation | ||
| $instance |
NULL on failure else array( 'start' => offset in the file, 'length' => object length, 'content' => dictionary contents )
_parse_pdf_string( $source_string, $offset) : array
Parse a PDF string object
Returns an array with one dictionary entry. The array also has a '/length' element containing the number of bytes occupied by the string in the source string, including the enclosing parentheses.
| $source_string | ||
| $offset |
( key => array( 'type' => type, 'value' => value, '/length' => length ) ) for the string
_parse_pdf_LPD_dictionary( $source_string, $filesize) : mixed
Parse a PDF Linearization Parameter Dictionary object
Returns an array of dictionary contents, classified by object type: boolean, numeric, string, hex (string), indirect (object), name, array, dictionary, stream, and null. The array also has a '/length' element containing the number of bytes occupied by the dictionary in the source string, excluding the enclosing delimiters, if passed in.
| $source_string | ||
| $filesize |
array of dictionary objects on success, false on failure
_parse_pdf_dictionary( $source_string, $offset) : array
Parse a PDF dictionary object
Returns an array of dictionary contents, classified by object type: boolean, numeric, string, hex (string), indirect (object), name, array, dictionary, stream, and null. The array also has a '/length' element containing the number of bytes occupied by the dictionary in the source string, excluding the enclosing delimiters.
| $source_string | ||
| $offset |
( '/length' => length, key => array( 'type' => type, 'value' => value ) ) for each dictionary field