Index

  1. \SetaPDF
    1. Core
    2. Core
      1. Parser
        1. CrossReferenceTable
        2. CrossReferenceTable
          1. CrossReferenceTableInterface
          2. Exception

SetaPDF_Core_Parser_CrossReferenceTable A PDF cross reference parser

File: /SetaPDF v2/Core/Parser/CrossReferenceTable.php

Class hierarchy

Implements

Summary

Static Properties

Methods

Properties

Constants

Constants

COMPRESSED_ALL

public const integer SetaPDF_Core_Parser_CrossReferenceTable::COMPRESSED_ALL = 1

Constant for full compression.

COMPRESSED_HYBRID

public const integer SetaPDF_Core_Parser_CrossReferenceTable::COMPRESSED_HYBRID = 2

Constant for a hybrid compression.

COMPRESSED_NONE

public const integer SetaPDF_Core_Parser_CrossReferenceTable::COMPRESSED_NONE = 0

Constant for none compression.


Static Properties

$fileTrailerSearchLength

static public integer SetaPDF_Core_Parser_CrossReferenceTable::$fileTrailerSearchLength = 5500

The byte count in which the initial xref keyword should be searched for

$readOnAccess

static public boolean SetaPDF_Core_Parser_CrossReferenceTable::$readOnAccess = true

A flag indicating the way of reading the xref table.

If set to true, the xref table will only read/resolved if the access to an object is needed. This is very fast for a small amount of access (updates). If set to false, the complete xref-table will be read in at once. This is faster if the document should be completely rewritten.


Properties

$_compressed

protected integer SetaPDF_Core_Parser_CrossReferenceTable::$_compressed = 0

Cross-reference uses compressed object streams, hybrid or none

$_compressedXrefObjects

protected array SetaPDF_Core_Parser_CrossReferenceTable::$_compressedXrefObjects = array()

An array holding all resolved indirect objects representing compressed xref tables.

$_compressedXrefObjectsOffsets

protected array SetaPDF_Core_Parser_CrossReferenceTable::$_compressedXrefObjectsOffsets = array()

Object offsets of cross-reference streams.

We separate these offsets to allow faulty overwrites of these objects.

$_maxObjId

protected integer SetaPDF_Core_Document_CrossReferenceTable::$_maxObjId = 0

The greatest used object id

$_objectOffsets

protected array SetaPDF_Core_Document_CrossReferenceTable::$_objectOffsets = array(...)

The cross-reference content

$_parser

protected SetaPDF_Core_Parser_Pdf SetaPDF_Core_Parser_CrossReferenceTable::$_parser

The PDF parser instance

$_parserObjectOffsets

protected array SetaPDF_Core_Parser_CrossReferenceTable::$_parserObjectOffsets = array()

Object offsets in the parser File

$_pointerToXref

protected integer SetaPDF_Core_Parser_CrossReferenceTable::$_pointerToXref

The initial pointer to the xref table

$_startOffset

protected int SetaPDF_Core_Parser_CrossReferenceTable::$_startOffset

Offset for PDF documents with invalid data before the PDF header.

$_trailer

protected SetaPDF_Core_Type_Dictionary SetaPDF_Core_Parser_CrossReferenceTable::$_trailer

The trailer dictionary

$_updatedOffsets

protected array SetaPDF_Core_Document_CrossReferenceTable::$_updatedOffsets = array()

Updated offsets

$_xrefSubsection

protected array SetaPDF_Core_Parser_CrossReferenceTable::$_xrefSubsection = array()

Offset positions of subsections or cross reference stream objects


Methods

__construct()

public SetaPDF_Core_Parser_CrossReferenceTable::__construct ()

The constructor.

Parameters
$parser : SetaPDF_Core_Parser_Pdf
 
Exceptions

Throws SetaPDF_Core_Exception

Throws SetaPDF_Core_Parser_CrossReferenceTable_Exception

Throws SetaPDF_Core_Parser_Pdf_InvalidTokenException

Throws SetaPDF_Core_Type_IndirectReference_Exception

_findStartOffset()

protected SetaPDF_Core_Parser_CrossReferenceTable::_findStartOffset (
void
): void

Counts the bytes to the initial PDF file header to get an offset which will be used along with all other byte offsets.

Exceptions

Throws SetaPDF_Core_Parser_CrossReferenceTable_Exception

See

_readTrailerAndXref()

protected SetaPDF_Core_Parser_CrossReferenceTable::_readTrailerAndXref (
integer|boolean $xrefOffset
): void

Read the document trailer and initiate the initial parsing of the xref table.

Parameters
$xrefOffset : integer|boolean
 
Exceptions

Throws SetaPDF_Core_Exception

Throws SetaPDF_Core_Parser_CrossReferenceTable_Exception

Throws SetaPDF_Core_Parser_Pdf_InvalidTokenException

Throws SetaPDF_Core_Type_IndirectReference_Exception

_readXref()

protected SetaPDF_Core_Parser_CrossReferenceTable::_readXref (
void
): void

Read the xref table at a specific position.

Exceptions

Throws SetaPDF_Core_Parser_CrossReferenceTable_Exception

cleanUp()

public SetaPDF_Core_Parser_CrossReferenceTable::cleanUp (
void
): void

Release memory/references.

deleteObject()

public SetaPDF_Core_Document_CrossReferenceTable::deleteObject (
integer $objectId
): void

Mark an object as deleted.

Parameters
$objectId : integer
 

getCompressedStream()

public SetaPDF_Core_Document_CrossReferenceTable::getCompressedStream (
SetaPDF_Core_Type_Dictionary $value, integer $newPointerToXref [, boolean $onlyUpdated = true ]
): boolean|SetaPDF_Core_Type_Stream

Get the cross reference as a compressed stream object.

Parameters
$value : SetaPDF_Core_Type_Dictionary
 
$newPointerToXref : integer
 
$onlyUpdated : boolean
 

getCompressedXrefObjects()

public SetaPDF_Core_Parser_CrossReferenceTable::getCompressedXrefObjects (
void
): array

Get all indirect objects holding cross-reference streams.

getDefinedObjectIds()

public SetaPDF_Core_Parser_CrossReferenceTable::getDefinedObjectIds (
void
): array

Get all defined object ids.

This method returns an array of all objects which are noticed in any cross-reference table. The appearance of an object id in this list is not an evidence of existence of the desired object.

getDefiniedObjectIds()

public SetaPDF_Core_Document_CrossReferenceTable::getDefiniedObjectIds (
void
): array

Alias for getDefinedObjectIds()

getGenerationNumberByObjectId()

public SetaPDF_Core_Parser_CrossReferenceTable::getGenerationNumberByObjectId (
integer $objectId
): integer|boolean

Get the generation number by an object id.

Parameters
$objectId : integer
 
Exceptions

Throws SetaPDF_Core_Type_Exception

getOffsetFor()

public SetaPDF_Core_Document_CrossReferenceTable::getOffsetFor (
integer $objectId [, integer|null $generation = 0 ]
): integer|array|boolean

Get an offset for an object.

Parameters
$objectId : integer
 
$generation : integer|null
 

getParserOffsetFor()

public SetaPDF_Core_Parser_CrossReferenceTable::getParserOffsetFor (
integer $objectId [, integer $generation = null [, integer &$objectGeneration = null ]]
): false|array

Returns the offset position of an object.

Parameters
$objectId : integer
 
$generation : integer
 
$objectGeneration : integer

The final generation number, resolved if no generation number was given.

Exceptions

Throws SetaPDF_Core_Parser_Exception

Throws SetaPDF_Core_Type_Exception

Throws SetaPDF_Exception

Throws SetaPDF_Exception_NotImplemented

getParserOffsetOfCrossreferenceStream()

public SetaPDF_Core_Parser_CrossReferenceTable::getParserOffsetOfCrossreferenceStream (
integer $objectId, integer $generation
): false|mixed

Get the byte-offset of a cross-reference stream by its object id.

Parameters
$objectId : integer
 
$generation : integer
 

getPointerToXref()

public SetaPDF_Core_Parser_CrossReferenceTable::getPointerToXref (
void
): integer

Find the initial point to the xref table.

Exceptions

Throws SetaPDF_Core_Exception

Throws SetaPDF_Core_Parser_CrossReferenceTable_Exception

Throws SetaPDF_Core_Type_IndirectReference_Exception

getSize()

public SetaPDF_Core_Document_CrossReferenceTable::getSize (
void
): integer

Get the size of the cross-reference table.

getStartOffset()

public SetaPDF_Core_Parser_CrossReferenceTable::getStartOffset (
void
): int

Get the start offset.

getTrailer()

public SetaPDF_Core_Parser_CrossReferenceTable::getTrailer (
void
): SetaPDF_Core_Type_Dictionary

Returns the trailer dictionary.

isCompressed()

public SetaPDF_Core_Parser_CrossReferenceTable::isCompressed (
void
): integer

Check if the xref table uses compressed xref streams.

Use getCompressed

isOffsetUpdated()

public SetaPDF_Core_Document_CrossReferenceTable::isOffsetUpdated (
integer $objectId
): boolean

Checks if an objects offset is updated.

Parameters
$objectId : integer
 

offsetsUpdated()

public SetaPDF_Core_Document_CrossReferenceTable::offsetsUpdated (
void
): bool

Checks whether any offset was updated or not.

setOffsetFor()

public SetaPDF_Core_Document_CrossReferenceTable::setOffsetFor (
integer $objectId, integer $generation, integer|array $offset
): void

Set an object offset.

Parameters
$objectId : integer
 
$generation : integer
 
$offset : integer|array
 

updateSize()

public SetaPDF_Core_Document_CrossReferenceTable::updateSize (
integer $objectId
): void

Updates the size value of this cross-reference table.

Parameters
$objectId : integer
 

writeNormal()

public SetaPDF_Core_Document_CrossReferenceTable::writeNormal (
SetaPDF_Core_Writer_WriterInterface $writer [, boolean $onlyUpdated = true ]
): integer

Writes the cross reference to a writer.

Parameters
$writer : SetaPDF_Core_Writer_WriterInterface
 
$onlyUpdated : boolean
 

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