org.apache.pdfbox.preflight.parser

Class PreflightParser

java.lang.Object

org.apache.pdfbox.pdfparser.BaseParser

org.apache.pdfbox.pdfparser.COSParser

org.apache.pdfbox.pdfparser.PDFParser

org.apache.pdfbox.preflight.parser.PreflightParser

public class PreflightParser
extends PDFParser

Field Summary

Fields

Modifier and Type	Field and Description
protected PreflightContext	ctx
static Charset	encoding Define a one byte encoding that hasn't specific encoding in UTF-8 charset.
protected DataSource	originalDocument
protected PreflightDocument	preflightDocument
protected ValidationResult	validationResult

Fields inherited from class org.apache.pdfbox.pdfparser.COSParser

EOF_MARKER, fileLen, initialParseDone, OBJ_MARKER, securityHandler, SYSPROP_EOFLOOKUPRANGE, SYSPROP_PARSEMINIMAL, TMP_FILE_PREFIX, xrefTrailerResolver

Fields inherited from class org.apache.pdfbox.pdfparser.BaseParser

A, ASCII_CR, ASCII_LF, B, D, DEF, document, E, ENDOBJ_STRING, ENDSTREAM_STRING, J, M, N, O, pdfSource, PROP_PUSHBACK_SIZE, R, S, STREAM_STRING, T, validationParsing

Constructor Summary

Constructors

Constructor and Description
PreflightParser(DataSource input)
PreflightParser(File file)
PreflightParser(String filename)

Method Summary

Methods

Modifier and Type	Method and Description
protected void	addValidationError(ValidationResult.ValidationError error) Add the error to the ValidationResult.
protected void	addValidationErrors(List<ValidationResult.ValidationError> errors)
protected void	checkEndstreamKeyWord() 'endstream' must be preceded by an EOL
protected void	checkPdfHeader() Check that the PDF header match rules of the PDF/A specification.
protected void	checkStreamKeyWord() 'stream' must be followed by <CR><LF> or only <LF>
protected void	createContext() Create a validation context.
protected void	createPdfADocument(Format format, PreflightConfiguration config)
protected static ValidationResult	createUnknownErrorResult() Create an instance of ValidationResult with a ValidationError(UNKNOWN_ERROR)
PDDocument	getPDDocument() This will get the PD document that was parsed.
PreflightDocument	getPreflightDocument()
protected void	initialParse() The initial parse will first parse only the trailer, the xrefstart and all xref tables to have a pointer (offset) to all the pdf's objects.
protected int	lastIndexOf(char[] pattern, byte[] buf, int endOff) Searches last appearance of pattern within buffer.
void	parse() This will parse the stream and populate the COSDocument object.
void	parse(Format format) Parse the given file and check if it is a confirming file according to the given format.
void	parse(Format format, PreflightConfiguration config) Parse the given file and check if it is a confirming file according to the given format.
protected COSArray	parseCOSArray() This will parse a PDF array object.
protected COSName	parseCOSName() This will parse a PDF name from the stream.
protected COSStream	parseCOSStream(COSDictionary dic) Wraps the COSParser.parseCOSStream(org.apache.pdfbox.cos.COSDictionary) to check rules on 'stream' and 'endstream' keywords.
protected COSString	parseCOSString() Check that the hexa string contains only an even number of Hexadecimal characters.
protected COSBase	parseDirObject() Call BaseParser.parseDirObject() check limit range for Float, Integer and number of Dictionary entries.
protected COSBase	parseObjectDynamically(long objNr, int objGenNr, boolean requireExistingNotCompressedObj) This will parse the next object from the stream and add it to the local state.
protected boolean	parseXrefTable(long startByteOffset) Same method than the COSParser.parseXrefTable(long) with additional controls : - EOL mandatory after the 'xref' keyword - Cross reference subsection header uses single white space as separator - and so on

Methods inherited from class org.apache.pdfbox.pdfparser.COSParser

getDocument, getFirstTrailer, getLastTrailer, getStartxrefOffset, isLenient, isLinearized, parseDictObjects, parseFDFHeader, parseObjectDynamically, parsePDFHeader, parseSuspensionObjects, parseTrailerValuesDynamically, parseXref, rebuildTrailer, setEOFLookupRange, setLenient

Methods inherited from class org.apache.pdfbox.pdfparser.BaseParser

isClosing, isClosing, isDigit, isDigit, isEndOfName, isEOL, isEOL, isSpace, isSpace, isWhitespace, isWhitespace, parseBoolean, parseCOSDictionary, readExpectedChar, readExpectedString, readExpectedString, readGenerationNumber, readInt, readLine, readLineWithoutWhitespacesSkip, readLong, readObjectNumber, readString, readString, readStringNumber, skipSpaces, skipWhiteSpaces

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

encoding

public static final Charset encoding

Define a one byte encoding that hasn't specific encoding in UTF-8 charset. Avoid unexpected error when the encoding is Cp5816

originalDocument

protected DataSource originalDocument

validationResult

protected ValidationResult validationResult

preflightDocument

protected PreflightDocument preflightDocument

ctx

protected PreflightContext ctx

Constructor Detail

PreflightParser

public PreflightParser(File file)
                throws IOException

Throws:

IOException

PreflightParser

public PreflightParser(String filename)
                throws IOException

Throws:

IOException

PreflightParser

public PreflightParser(DataSource input)
                throws IOException

Throws:

IOException

Method Detail

createUnknownErrorResult

protected static ValidationResult createUnknownErrorResult()

Create an instance of ValidationResult with a ValidationError(UNKNOWN_ERROR)

Returns:

the ValidationError instance.

addValidationError

protected void addValidationError(ValidationResult.ValidationError error)

Add the error to the ValidationResult. If the validationResult is null, an instance is created using the isWarning boolean of the ValidationError to know if the ValidationResult must be flagged as Valid.

Parameters:

error -

addValidationErrors

protected void addValidationErrors(List<ValidationResult.ValidationError> errors)

parse

public void parse()
           throws IOException

Description copied from class: PDFParser

This will parse the stream and populate the COSDocument object. This will close the stream when it is done parsing.

Overrides:

parse in class PDFParser

Throws:

IOException - If there is an error reading from the stream or corrupt data is found.

parse

public void parse(Format format)
           throws IOException

Parse the given file and check if it is a confirming file according to the given format.

Parameters:

format - format that the document should follow (default Format.PDF_A1B)

Throws:

IOException

parse

public void parse(Format format,
         PreflightConfiguration config)
           throws IOException

Parse the given file and check if it is a confirming file according to the given format.

Parameters:

format - format that the document should follow (default Format.PDF_A1B)

config - Configuration bean that will be used by the PreflightDocument. If null the format is used to determine the default configuration.

Throws:

IOException

createPdfADocument

protected void createPdfADocument(Format format,
                      PreflightConfiguration config)
                           throws IOException

Throws:

IOException

createContext

protected void createContext()

Create a validation context. This context is set to the PreflightDocument.

getPDDocument

public PDDocument getPDDocument()
                         throws IOException

Description copied from class: PDFParser

This will get the PD document that was parsed. When you are done with this document you must call close() on it to release resources.

Overrides:

getPDDocument in class PDFParser

Returns:

The document at the PD layer.

Throws:

IOException - If there is an error getting the document.

getPreflightDocument

public PreflightDocument getPreflightDocument()
                                       throws IOException

Throws:

IOException

initialParse

protected void initialParse()
                     throws IOException

Description copied from class: PDFParser

The initial parse will first parse only the trailer, the xrefstart and all xref tables to have a pointer (offset) to all the pdf's objects. It can handle linearized pdfs, which will have an xref at the end pointing to an xref at the beginning of the file. Last the root object is parsed.

Overrides:

initialParse in class PDFParser

Throws:

IOException - If something went wrong.

checkPdfHeader

protected void checkPdfHeader()

Check that the PDF header match rules of the PDF/A specification. First line (offset 0) must be a comment with the PDF version (version 1.0 isn't conform to the PDF/A specification) Second line is a comment with at least 4 bytes greater than 0x80

parseXrefTable

protected boolean parseXrefTable(long startByteOffset)
                          throws IOException

Same method than the COSParser.parseXrefTable(long) with additional controls : - EOL mandatory after the 'xref' keyword - Cross reference subsection header uses single white space as separator - and so on

Overrides:

parseXrefTable in class COSParser

Parameters:

startByteOffset - the offset to start at

Returns:

false on parsing error

Throws:

IOException - If an IO error occurs.

parseCOSStream

protected COSStream parseCOSStream(COSDictionary dic)
                            throws IOException

Wraps the COSParser.parseCOSStream(org.apache.pdfbox.cos.COSDictionary) to check rules on 'stream' and 'endstream' keywords. checkStreamKeyWord() and checkEndstreamKeyWord()

Overrides:

parseCOSStream in class COSParser

Parameters:

dic - dictionary that goes with this stream.

Returns:

parsed pdf stream.

Throws:

IOException - if an error occurred reading the stream, like problems with reading length attribute, stream does not end with 'endstream' after data read, stream too short etc.

checkStreamKeyWord

protected void checkStreamKeyWord()
                           throws IOException

'stream' must be followed by <CR><LF> or only <LF>

Throws:

IOException

checkEndstreamKeyWord

protected void checkEndstreamKeyWord()
                              throws IOException

'endstream' must be preceded by an EOL

Throws:

IOException

parseCOSArray

protected COSArray parseCOSArray()
                          throws IOException

Description copied from class: BaseParser

This will parse a PDF array object.

Overrides:

parseCOSArray in class BaseParser

Returns:

The parsed PDF array.

Throws:

IOException - If there is an error parsing the stream.

parseCOSName

protected COSName parseCOSName()
                        throws IOException

Description copied from class: BaseParser

This will parse a PDF name from the stream.

Overrides:

parseCOSName in class BaseParser

Returns:

The parsed PDF name.

Throws:

IOException - If there is an error reading from the stream.

parseCOSString

protected COSString parseCOSString()
                            throws IOException

Check that the hexa string contains only an even number of Hexadecimal characters. Once it is done, reset the offset at the beginning of the string and call BaseParser.parseCOSString()

Overrides:

parseCOSString in class BaseParser

Returns:

The parsed PDF string.

Throws:

IOException - If there is an error reading from the stream.

parseDirObject

protected COSBase parseDirObject()
                          throws IOException

Call BaseParser.parseDirObject() check limit range for Float, Integer and number of Dictionary entries.

Overrides:

parseDirObject in class BaseParser

Returns:

The parsed object.

Throws:

IOException - if there is an error during parsing.

parseObjectDynamically

protected COSBase parseObjectDynamically(long objNr,
                             int objGenNr,
                             boolean requireExistingNotCompressedObj)
                                  throws IOException

Description copied from class: COSParser

This will parse the next object from the stream and add it to the local state. It's reduced to parsing an indirect object.

Overrides:

parseObjectDynamically in class COSParser

Parameters:

objNr - object number of object to be parsed

objGenNr - object generation number of object to be parsed

requireExistingNotCompressedObj - if true the object to be parsed must be defined in xref (comment: null objects may be missing from xref) and it must not be a compressed object within object stream (this is used to circumvent being stuck in a loop in a malicious PDF)

Returns:

the parsed object (which is also added to document object)

Throws:

IOException - If an IO error occurs.

lastIndexOf

protected int lastIndexOf(char[] pattern,
              byte[] buf,
              int endOff)

Description copied from class: COSParser

Searches last appearance of pattern within buffer. Lookup before _lastOff and goes back until 0.

Overrides:

lastIndexOf in class COSParser

Parameters:

pattern - pattern to search for

buf - buffer to search pattern in

endOff - offset (exclusive) where lookup starts at

Returns:

start offset of pattern within buffer or -1 if pattern could not be found