diff options
Diffstat (limited to 'src/main/java/org/pdfbox/pdfparser/BaseParser.java')
| -rw-r--r-- | src/main/java/org/pdfbox/pdfparser/BaseParser.java | 1369 |
1 files changed, 0 insertions, 1369 deletions
diff --git a/src/main/java/org/pdfbox/pdfparser/BaseParser.java b/src/main/java/org/pdfbox/pdfparser/BaseParser.java deleted file mode 100644 index 3937025..0000000 --- a/src/main/java/org/pdfbox/pdfparser/BaseParser.java +++ /dev/null @@ -1,1369 +0,0 @@ -/**
- * Copyright (c) 2003-2005, www.pdfbox.org
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- * 1. Redistributions of source code must retain the above copyright notice,
- * this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright notice,
- * this list of conditions and the following disclaimer in the documentation
- * and/or other materials provided with the distribution.
- * 3. Neither the name of pdfbox; nor the names of its
- * contributors may be used to endorse or promote products derived from this
- * software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
- * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
- * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
- * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- * http://www.pdfbox.org
- *
- */
-package org.pdfbox.pdfparser;
-
-import java.io.BufferedInputStream;
-import java.io.InputStream;
-import java.io.IOException;
-import java.io.OutputStream;
-import java.io.RandomAccessFile;
-
-import java.util.ArrayList;
-import java.util.List;
-
-import org.pdfbox.io.ByteArrayPushBackInputStream;
-import org.pdfbox.io.PushBackInputStream;
-
-import org.pdfbox.cos.COSArray;
-import org.pdfbox.cos.COSBase;
-import org.pdfbox.cos.COSBoolean;
-import org.pdfbox.cos.COSDictionary;
-import org.pdfbox.cos.COSDocument;
-import org.pdfbox.cos.COSInteger;
-import org.pdfbox.cos.COSName;
-import org.pdfbox.cos.COSNull;
-import org.pdfbox.cos.COSNumber;
-import org.pdfbox.cos.COSObject;
-import org.pdfbox.cos.COSStream;
-import org.pdfbox.cos.COSString;
-
-import org.pdfbox.persistence.util.COSObjectKey;
-import org.apache.log4j.Logger;
-
-/**
- * This class is used to contain parsing logic that will be used by both the
- * PDFParser and the COSStreamParser.
- *
- * @author Ben Litchfield (ben@benlitchfield.com)
- * @version $Revision: 1.57 $
- */
-public abstract class BaseParser
-{
- private static Logger log = Logger.getLogger(BaseParser.class);
-
- /**
- * This is a byte array that will be used for comparisons.
- */
- public static final byte[] ENDSTREAM =
- new byte[] {101,110,100,115,116,114,101,97,109};//"endstream".getBytes( "ISO-8859-1" );
-
- /**
- * This is a byte array that will be used for comparisons.
- */
- public static final String DEF = "def";
-
- /**
- * This is the stream that will be read from.
- */
- //protected PushBackByteArrayStream pdfSource;
- protected PushBackInputStream pdfSource;
-
- /**
- * moved xref here, is a persistence construct
- * maybe not needed anyway when not read from behind with delayed
- * access to objects.
- */
- private List xrefs = new ArrayList();
-
- private COSDocument document;
-
- /**
- * Constructor.
- *
- * @param input The input stream to read the data from.
- *
- * @throws IOException If there is an error reading the input stream.
- */
- public BaseParser( InputStream input) throws IOException
- {
- //pdfSource = new PushBackByteArrayStream( input );
- pdfSource = new PushBackInputStream( new BufferedInputStream( input, 16384 ), 4096 );
- }
-
- /**
- * Constructor.
- *
- * @param input The array to read the data from.
- *
- * @throws IOException If there is an error reading the byte data.
- */
- protected BaseParser(byte[] input) throws IOException
- {
- pdfSource = new ByteArrayPushBackInputStream(input);
- }
-
- /**
- * Set the document for this stream.
- *
- * @param doc The current document.
- */
- public void setDocument( COSDocument doc )
- {
- document = doc;
- }
-
- private static boolean isHexDigit(char ch)
- {
- return (ch >= '0' && ch <= '9') ||
- (ch >= 'a' && ch <= 'f') ||
- (ch >= 'A' && ch <= 'F');
- // the line below can lead to problems with certain versions of the IBM JIT compiler
- // (and is slower anyway)
- //return (HEXDIGITS.indexOf(ch) != -1);
- }
-
- /**
- * This will parse a PDF dictionary value.
- *
- * @return The parsed Dictionary object.
- *
- * @throws IOException If there is an error parsing the dictionary object.
- */
- private COSBase parseCOSDictionaryValue() throws IOException
- {
-
- if( log.isDebugEnabled() )
- {
- log.debug("parseCOSDictionaryValue() " + pdfSource );
- }
- COSBase retval = null;
- COSBase number = parseDirObject();
- skipSpaces();
- char next = (char)pdfSource.peek();
- if( next >= '0' && next <= '9' )
- {
- COSBase generationNumber = parseDirObject();
- skipSpaces();
- char r = (char)pdfSource.read();
- if( r != 'R' )
- {
- throw new IOException( "expected='R' actual='" + r + "' " + pdfSource );
- }
- COSObjectKey key = new COSObjectKey(((COSInteger) number).intValue(),
- ((COSInteger) generationNumber).intValue());
- retval = document.getObjectFromPool(key);
- }
- else
- {
- retval = number;
- }
- return retval;
- }
-
- /**
- * This will parse a PDF dictionary.
- *
- * @return The parsed dictionary.
- *
- * @throws IOException IF there is an error reading the stream.
- */
- protected COSDictionary parseCOSDictionary() throws IOException
- {
- if( log.isDebugEnabled() )
- {
- log.debug("parseCOSDictionary() " + pdfSource );
- }
- char c = (char)pdfSource.read();
- if( c != '<')
- {
- throw new IOException( "expected='<' actual='" + c + "'" );
- }
- c = (char)pdfSource.read();
- if( c != '<')
- {
- throw new IOException( "expected='<' actual='" + c + "' " + pdfSource );
- }
- skipSpaces();
- COSDictionary obj = new COSDictionary();
- boolean done = false;
- while( !done )
- {
- skipSpaces();
- c = (char)pdfSource.peek();
- if( c == '>')
- {
- done = true;
- }
- else
- {
- COSName key = parseCOSName();
- COSBase value = parseCOSDictionaryValue();
- skipSpaces();
- if( ((char)pdfSource.peek()) == 'd' )
- {
- //if the next string is 'def' then we are parsing a cmap stream
- //and want to ignore it, otherwise throw an exception.
- String potentialDEF = readString();
- if( !potentialDEF.equals( DEF ) )
- {
- pdfSource.unread( potentialDEF.getBytes() );
- }
- else
- {
- skipSpaces();
- }
- }
-
- if( value == null )
- {
- throw new IOException("Bad Dictionary Declaration " + pdfSource );
- }
- obj.setItem( key, value );
- }
- }
- char ch = (char)pdfSource.read();
- if( ch != '>' )
- {
- throw new IOException( "expected='>' actual='" + ch + "'" );
- }
- ch = (char)pdfSource.read();
- if( ch != '>' )
- {
- throw new IOException( "expected='>' actual='" + ch + "'" );
- }
- if( log.isDebugEnabled() )
- {
- log.debug("parseCOSDictionary() done peek='" + pdfSource.peek() + "'" );
- }
- return obj;
- }
-
- /**
- * This will read a COSStream from the input stream.
- *
- * @param file The file to write the stream to when reading.
- * @param dic The dictionary that goes with this stream.
- *
- * @return The parsed pdf stream.
- *
- * @throws IOException If there is an error reading the stream.
- */
- protected COSStream parseCOSStream( COSDictionary dic, RandomAccessFile file ) throws IOException
- {
- if( log.isDebugEnabled() )
- {
- log.debug("parseCOSStream() " + pdfSource );
- }
- COSStream stream = new COSStream( dic, file );
- OutputStream out = null;
- try
- {
- String streamString = readString();
- //long streamLength;
-
- if (!streamString.equals("stream"))
- {
- throw new IOException("expected='stream' actual='" + streamString + "'");
- }
-
- //PDF Ref 3.2.7 A stream must be followed by either
- //a CRLF or LF but nothing else.
-
- int whitespace = pdfSource.read();
-
- //see brother_scan_cover.pdf, it adds whitespaces
- //after the stream but before the start of the
- //data, so just read those first
- while (whitespace == 0x20)
- {
- whitespace = pdfSource.read();
- }
-
- if( whitespace == 0x0D )
- {
- whitespace = pdfSource.read();
- if( whitespace != 0x0A )
- {
- pdfSource.unread( whitespace );
- //The spec says this is invalid but it happens in the real
- //world so we must support it.
- //throw new IOException("expected='0x0A' actual='0x" +
- // Integer.toHexString(whitespace) + "' " + pdfSource);
- }
- }
- else if (whitespace == 0x0A)
- {
- //that is fine
- }
- else
- {
- //we are in an error.
- //but again we will do a lenient parsing and just assume that everything
- //is fine
- pdfSource.unread( whitespace );
- //throw new IOException("expected='0x0D or 0x0A' actual='0x" +
- //Integer.toHexString(whitespace) + "' " + pdfSource);
-
- }
-
-
- COSBase streamLength = dic.getDictionaryObject(COSName.LENGTH);
- long length = -1;
- if( streamLength instanceof COSNumber )
- {
- length = ((COSNumber)streamLength).intValue();
- }
- else if( streamLength instanceof COSObject &&
- ((COSObject)streamLength).getObject() instanceof COSNumber )
- {
- length = ((COSNumber)((COSObject)streamLength).getObject()).intValue();
- }
-
- //length = -1;
- //streamLength = null;
-
- //Need to keep track of the
- out = stream.createFilteredStream( streamLength );
- String endStream = null;
- //the length is wrong in some pdf documents which means
- //that PDFBox must basically ignore it in order to be able to read
- //the most number of PDF documents. This of course is a penalty hit,
- //maybe I could implement a faster parser.
- /**if( length != -1 )
- {
- byte[] buffer = new byte[1024];
- int amountRead = 0;
- int totalAmountRead = 0;
- while( amountRead != -1 && totalAmountRead < length )
- {
- int maxAmountToRead = Math.min(buffer.length, (int)(length-totalAmountRead));
- amountRead = pdfSource.read(buffer,0,maxAmountToRead);
- totalAmountRead += amountRead;
- if( amountRead != -1 )
- {
- out.write( buffer, 0, amountRead );
- }
- }
- }
- else
- {**/
- readUntilEndStream( out );
- /**}*/
- skipSpaces();
- endStream = readString();
-
- if (!endStream.equals("endstream"))
- {
- readUntilEndStream( out );
- endStream = readString();
- if( !endStream.equals( "endstream" ) )
- {
- throw new IOException("expected='endstream' actual='" + endStream + "' " + pdfSource);
- }
- }
- }
- finally
- {
- if( out != null )
- {
- out.close();
- }
- }
- if( log.isDebugEnabled() )
- {
- log.debug("parseCOSStream() done" );
- }
- return stream;
- }
-
- private void readUntilEndStream( OutputStream out ) throws IOException
- {
- int currentIndex = 0;
- int byteRead = 0;
- //this is the additional bytes buffered but not written
- int additionalBytes=0;
- byte[] buffer = new byte[ENDSTREAM.length+additionalBytes];
- int writeIndex = 0;
- while(!cmpCircularBuffer( buffer, currentIndex, ENDSTREAM ) && byteRead != -1 )
- {
- writeIndex = currentIndex - buffer.length;
- if( writeIndex >= 0 )
- {
- out.write( buffer[writeIndex%buffer.length] );
- }
- byteRead = pdfSource.read();
- buffer[currentIndex%buffer.length] = (byte)byteRead;
- currentIndex++;
- }
-
- //we want to ignore the end of the line data when reading a stream
- //so will make an attempt to ignore it.
- /*writeIndex = currentIndex - buffer.length;
- if( buffer[writeIndex%buffer.length] == 13 &&
- buffer[(writeIndex+1)%buffer.length] == 10 )
- {
- //then ignore the newline before the endstream
- }
- else if( buffer[(writeIndex+1)%buffer.length] == 10 )
- {
- //Then first byte is data, second byte is newline
- out.write( buffer[writeIndex%buffer.length] );
- }
- else
- {
- out.write( buffer[writeIndex%buffer.length] );
- out.write( buffer[(writeIndex+1)%buffer.length] );
- }*/
-
- /**
- * Old way of handling newlines before endstream
- for( int i=0; i<additionalBytes; i++ )
- {
- writeIndex = currentIndex - buffer.length;
- if( writeIndex >=0 &&
- //buffer[writeIndex%buffer.length] != 10 &&
- buffer[writeIndex%buffer.length] != 13 )
- {
- out.write( buffer[writeIndex%buffer.length] );
- }
- currentIndex++;
- }
- */
- pdfSource.unread( ENDSTREAM );
-
- }
-
- /**
- * This basically checks to see if the next compareTo.length bytes of the
- * buffer match the compareTo byte array.
- */
- private boolean cmpCircularBuffer( byte[] buffer, int currentIndex, byte[] compareTo )
- {
- int cmpLen = compareTo.length;
- int buflen = buffer.length;
- boolean match = true;
- int off = currentIndex-cmpLen;
- if( off < 0 )
- {
- match = false;
- }
- for( int i=0; match && i<cmpLen; ++i )
- {
- match = buffer[(off+i)%buflen] == compareTo[i];
- }
- return match;
- }
-
- /**
- * This will parse a PDF string.
- *
- * @return The parsed PDF string.
- *
- * @throws IOException If there is an error reading from the stream.
- */
- protected COSString parseCOSString() throws IOException
- {
- if( log.isDebugEnabled() )
- {
- log.debug("parseCOSString() " + pdfSource );
- }
- char nextChar = (char)pdfSource.read();
- COSString retval = new COSString();
- char openBrace;
- char closeBrace;
- if( nextChar == '(' )
- {
- openBrace = '(';
- closeBrace = ')';
- }
- else if( nextChar == '<' )
- {
- openBrace = '<';
- closeBrace = '>';
- }
- else
- {
- throw new IOException( "parseCOSString string should start with '(' or '<' and not '" +
- nextChar + "' " + pdfSource );
- }
-
- //This is the number of braces read
- //
- int braces = 1;
- int c = pdfSource.read();
- while( braces > 0 && c != -1)
- {
- char ch = (char)c;
- int nextc = -2; // not yet read
- //if( log.isDebugEnabled() )
- //{
- // log.debug( "Parsing COSString character '" + c + "' code=" + (int)c );
- //}
-
- if(ch == closeBrace)
- {
- braces--;
- byte[] nextThreeBytes = new byte[3];
- int amountRead = pdfSource.read(nextThreeBytes);
-
- //lets handle the special case seen in Bull River Rules and Regulations.pdf
- //The dictionary looks like this
- // 2 0 obj
- // <<
- // /Type /Info
- // /Creator (PaperPort http://www.scansoft.com)
- // /Producer (sspdflib 1.0 http://www.scansoft.com)
- // /Title ( (5)
- // /Author ()
- // /Subject ()
- //
- // Notice the /Title, the braces are not even but they should
- // be. So lets assume that if we encounter an this scenario
- // <end_brace><new_line><opening_slash> then that
- // means that there is an error in the pdf and assume that
- // was the end of the document.
- if( amountRead == 3 )
- {
- if( nextThreeBytes[0] == 0x0d &&
- nextThreeBytes[1] == 0x0a &&
- nextThreeBytes[2] == 0x2f )
- {
- braces = 0;
- }
- }
- pdfSource.unread( nextThreeBytes, 0, amountRead );
- if( braces != 0 )
- {
- retval.append( ch );
- }
- }
- else if( ch == openBrace )
- {
- braces++;
- retval.append( ch );
- }
- else if( ch == '\\' )
- {
- //patched by ram
- char next = (char)pdfSource.read();
- switch(next)
- {
- case 'n':
- retval.append( '\n' );
- break;
- case 'r':
- retval.append( '\r' );
- break;
- case 't':
- retval.append( '\t' );
- break;
- case 'b':
- retval.append( '\b' );
- break;
- case 'f':
- retval.append( '\f' );
- break;
- case '(':
- case ')':
- case '\\':
- retval.append( next );
- break;
- case 10:
- case 13:
- //this is a break in the line so ignore it and the newline and continue
- c = pdfSource.read();
- while( isEOL(c) && c != -1)
- {
- c = pdfSource.read();
- }
- nextc = c;
- break;
- case '0':
- case '1':
- case '2':
- case '3':
- case '4':
- case '5':
- case '6':
- case '7':
- {
- StringBuffer octal = new StringBuffer();
- octal.append( next );
- c = pdfSource.read();
- char digit = (char)c;
- if( digit >= '0' && digit <= '7' )
- {
- octal.append( digit );
- c = pdfSource.read();
- digit = (char)c;
- if( digit >= '0' && digit <= '7' )
- {
- octal.append( digit );
- }
- else
- {
- nextc = c;
- }
- }
- else
- {
- nextc = c;
- }
-
- int character = 0;
- try
- {
- character = Integer.parseInt( octal.toString(), 8 );
- }
- catch( NumberFormatException e )
- {
- throw new IOException( "Error: Expected octal character, actual='" + octal + "'" );
- }
- retval.append( character );
- break;
- }
- default:
- {
- retval.append( '\\' );
- retval.append( next );
- //another ficken problem with PDF's, sometimes the \ doesn't really
- //mean escape like the PDF spec says it does, sometimes is should be literal
- //which is what we will assume here.
- //throw new IOException( "Unexpected break sequence '" + next + "' " + pdfSource );
- }
- }
- }
- else
- {
- if( openBrace == '<' )
- {
- if( isHexDigit(ch) )
- {
- retval.append( ch );
- }
- }
- else
- {
- retval.append( ch );
- }
- }
- if (nextc != -2)
- {
- c = nextc;
- }
- else
- {
- c = pdfSource.read();
- }
- }
- if (c != -1)
- {
- pdfSource.unread(c);
- }
- if( openBrace == '<' )
- {
- retval = COSString.createFromHexString( retval.getString() );
- }
- if( log.isDebugEnabled() )
- {
- log.debug("parseCOSString() done parsed=" + retval );
- }
- return retval;
- }
-
- /**
- * This will parse a PDF array object.
- *
- * @return The parsed PDF array.
- *
- * @throws IOException If there is an error parsing the stream.
- */
- protected COSArray parseCOSArray() throws IOException
- {
- if( log.isDebugEnabled() )
- {
- log.debug("parseCOSArray() " + pdfSource );
- }
- char ch = (char)pdfSource.read();
- if( ch != '[')
- {
- throw new IOException( "expected='[' actual='" + ch + "'" );
- }
- COSArray po = new COSArray();
- COSBase pbo = null;
- skipSpaces();
- int i = 0;
- while( ((i = pdfSource.peek()) > 0) && ((char)i != ']') )
- {
- pbo = parseDirObject();
- if( pbo instanceof COSObject )
- {
- COSInteger genNumber = (COSInteger)po.remove( po.size() -1 );
- COSInteger number = (COSInteger)po.remove( po.size() -1 );
- COSObjectKey key = new COSObjectKey(number.intValue(), genNumber.intValue());
- pbo = document.getObjectFromPool(key);
- }
- if( pbo != null )
- {
- po.add( pbo );
- }
- else
- {
- //it could be a bad object in the array which is just skipped
- }
- skipSpaces();
- }
- pdfSource.read(); //read ']'
- skipSpaces();
- if( log.isDebugEnabled() )
- {
- log.debug("parseCOSArray() done peek='" + (char)pdfSource.peek() + "'" );
- }
- return po;
- }
-
- /**
- * Determine if a character terminates a PDF name.
- *
- * @param ch The character
- * @return <code>true</code> if the character terminates a PDF name, otherwise <code>false</code>.
- */
- protected boolean isEndOfName(char ch)
- {
- return (ch == ' ' || ch == 13 || ch == 10 || ch == 9 || ch == '>' || ch == '<'
- || ch == '[' || ch =='/' || ch ==']' || ch ==')' || ch =='(' ||
- ch == -1 //EOF
- );
- }
-
- /**
- * This will parse a PDF name from the stream.
- *
- * @return The parsed PDF name.
- *
- * @throws IOException If there is an error reading from the stream.
- */
- protected COSName parseCOSName() throws IOException
- {
- if( log.isDebugEnabled() )
- {
- log.debug("parseCOSName() " + pdfSource );
- }
- COSName retval = null;
- int c = pdfSource.read();
- if( (char)c != '/')
- {
- throw new IOException("expected='/' actual='" + (char)c + "'-" + c + " " + pdfSource );
- }
- // costruisce il nome
- StringBuffer buffer = new StringBuffer();
- c = pdfSource.read();
- while( c != -1 )
- {
- char ch = (char)c;
- if(ch == '#')
- {
- char ch1 = (char)pdfSource.read();
- char ch2 = (char)pdfSource.read();
-
- // Prior to PDF v1.2, the # was not a special character. Also,
- // it has been observed that various PDF tools do not follow the
- // spec with respect to the # escape, even though they report
- // PDF versions of 1.2 or later. The solution here is that we
- // interpret the # as an escape only when it is followed by two
- // valid hex digits.
- //
- if (isHexDigit(ch1) && isHexDigit(ch2))
- {
- String hex = "" + ch1 + ch2;
- try
- {
- buffer.append( (char) Integer.parseInt(hex, 16));
- }
- catch (NumberFormatException e)
- {
- if( log.isDebugEnabled() )
- {
- log.debug("isHexDigit(ch1)=" + isHexDigit(ch1) + ", isHexDigit(ch2)=" + isHexDigit(ch2));
- }
- throw new IOException("Error: expected hex number, actual='" + hex + "'");
- }
- c = pdfSource.read();
- }
- else
- {
- pdfSource.unread(ch2);
- c = ch1;
- buffer.append( ch );
- }
- }
- else if (isEndOfName(ch))
- {
- break;
- }
- else
- {
- buffer.append( ch );
- c = pdfSource.read();
- }
- }
- if (c != -1)
- {
- pdfSource.unread(c);
- }
- retval = COSName.getPDFName( buffer.toString() );
- return retval;
- }
-
- /**
- * This will parse a boolean object from the stream.
- *
- * @return The parsed boolean object.
- *
- * @throws IOException If an IO error occurs during parsing.
- */
- protected COSBoolean parseBoolean() throws IOException
- {
- COSBoolean retval = null;
- char c = (char)pdfSource.peek();
- if( c == 't' )
- {
- byte[] trueArray = new byte[ 4 ];
- int amountRead = pdfSource.read( trueArray, 0, 4 );
- String trueString = new String( trueArray, 0, amountRead );
- if( !trueString.equals( "true" ) )
- {
- throw new IOException( "Error parsing boolean: expected='true' actual='" + trueString + "'" );
- }
- else
- {
- retval = COSBoolean.TRUE;
- }
- }
- else if( c == 'f' )
- {
- byte[] falseArray = new byte[ 5 ];
- int amountRead = pdfSource.read( falseArray, 0, 5 );
- String falseString = new String( falseArray, 0, amountRead );
- if( !falseString.equals( "false" ) )
- {
- throw new IOException( "Error parsing boolean: expected='true' actual='" + falseString + "'" );
- }
- else
- {
- retval = COSBoolean.FALSE;
- }
- }
- else
- {
- throw new IOException( "Error parsing boolean expected='t or f' actual='" + c + "'" );
- }
- return retval;
- }
-
- /**
- * This will parse a directory object from the stream.
- *
- * @return The parsed object.
- *
- * @throws IOException If there is an error during parsing.
- */
- protected COSBase parseDirObject() throws IOException
- {
- if( log.isDebugEnabled() )
- {
- log.debug("parseDirObject() " + pdfSource );
- }
- COSBase retval = null;
-
- skipSpaces();
- int nextByte = pdfSource.peek();
- char c = (char)nextByte;
- switch(c)
- {
- case '<':
- {
- int leftBracket = pdfSource.read();//pull off first left bracket
- c = (char)pdfSource.peek(); //check for second left bracket
- pdfSource.unread( leftBracket );
- if(c == '<')
- {
-
- retval = parseCOSDictionary();
- skipSpaces();
- }
- else
- {
- retval = parseCOSString();
- }
- break;
- }
- case '[': // array
- {
- retval = parseCOSArray();
- break;
- }
- case '(':
- retval = parseCOSString();
- break;
- case '/': // name
- retval = parseCOSName();
- break;
- case 'n': // null
- {
- String nullString = readString();
- if( !nullString.equals( "null") )
- {
- throw new IOException("Expected='null' actual='" + nullString + "'");
- }
- retval = COSNull.NULL;
- break;
- }
- case 't':
- {
- byte[] trueBytes = new byte[4];
- int amountRead = pdfSource.read( trueBytes, 0, 4 );
- String trueString = new String( trueBytes, 0, amountRead );
- if( trueString.equals( "true" ) )
- {
- retval = COSBoolean.TRUE;
- }
- else
- {
- throw new IOException( "expected true actual='" + trueString + "' " + pdfSource );
- }
- break;
- }
- case 'f':
- {
- byte[] falseBytes = new byte[5];
- int amountRead = pdfSource.read( falseBytes, 0, 5 );
- String falseString = new String( falseBytes, 0, amountRead );
- if( falseString.equals( "false" ) )
- {
- retval = COSBoolean.FALSE;
- }
- else
- {
- throw new IOException( "expected false actual='" + falseString + "' " + pdfSource );
- }
- break;
- }
- case 'R':
- pdfSource.read();
- retval = new COSObject(null);
- break;
- case (char)-1:
- return null;
- default:
- {
- if( Character.isDigit(c) || c == '-' || c == '+' || c == '.')
- {
- StringBuffer buf = new StringBuffer();
- int ic = pdfSource.read();
- c = (char)ic;
- while( Character.isDigit( c )||
- c == '-' ||
- c == '+' ||
- c == '.' ||
- c == 'E' ||
- c == 'e' )
- {
- buf.append( c );
- ic = pdfSource.read();
- c = (char)ic;
- }
- if( ic != -1 )
- {
- pdfSource.unread( ic );
- }
- retval = COSNumber.get( buf.toString() );
- }
- else
- {
- //This is not suppose to happen, but we will allow for it
- //so we are more compatible with POS writers that don't
- //follow the spec
- String badString = readString();
- //throw new IOException( "Unknown dir object c='" + c +
- //"' peek='" + (char)pdfSource.peek() + "' " + pdfSource );
- if( log.isDebugEnabled() )
- {
- log.debug("parseDirObject() bad DIR object found. ignoring: '" + badString + "'");
- }
- if( badString == null || badString.length() == 0 )
- {
- int peek = pdfSource.peek();
- // we can end up in an infinite loop otherwise
- throw new IOException( "Unknown dir object c='" + c +
- "' cInt=" + (int)c + " peek='" + (char)peek + "' peekInt=" + peek + " " + pdfSource );
- }
-
- }
- }
- }
- if( log.isDebugEnabled() )
- {
- log.debug("parseDirObject() done retval=" +retval );
- }
- return retval;
- }
-
- /**
- * This will read the next string from the stream.
- *
- * @return The string that was read from the stream.
- *
- * @throws IOException If there is an error reading from the stream.
- */
- protected String readString() throws IOException
- {
- skipSpaces();
- StringBuffer buffer = new StringBuffer();
- int c = pdfSource.read();
- while( !isEndOfName((char)c) && !isClosing(c) && c != -1 )
- {
- buffer.append( (char)c );
- c = pdfSource.read();
- }
- if (c != -1)
- {
- pdfSource.unread(c);
- }
- return buffer.toString();
- }
-
- /**
- * This will read bytes until the end of line marker occurs.
- *
- * @param theString The next expected string in the stream.
- *
- * @return The characters between the current position and the end of the line.
- *
- * @throws IOException If there is an error reading from the stream or theString does not match what was read.
- */
- protected String readExpectedString( String theString ) throws IOException
- {
- int c = pdfSource.read();
- while( isWhitespace(c) && c != -1)
- {
- c = pdfSource.read();
- }
- StringBuffer buffer = new StringBuffer( theString.length() );
- int charsRead = 0;
- while( !isEOL(c) && c != -1 && charsRead < theString.length() )
- {
- char next = (char)c;
- buffer.append( next );
- if( theString.charAt( charsRead ) == next )
- {
- charsRead++;
- }
- else
- {
- throw new IOException( "Error: Expected to read '" + theString +
- "' instead started reading '" +buffer.toString() + "'" );
- }
- c = pdfSource.read();
- }
- while( isEOL(c) && c != -1 )
- {
- c = pdfSource.read();
- }
- if (c != -1)
- {
- pdfSource.unread(c);
- }
- return buffer.toString();
- }
-
- /**
- * This will read the next string from the stream up to a certain length.
- *
- * @param length The length to stop reading at.
- *
- * @return The string that was read from the stream of length 0 to length.
- *
- * @throws IOException If there is an error reading from the stream.
- */
- protected String readString( int length ) throws IOException
- {
- skipSpaces();
-
- int c = pdfSource.read();
-
- //average string size is around 2 and the normal string buffer size is
- //about 16 so lets save some space.
- StringBuffer buffer = new StringBuffer(length);
- while( !isWhitespace(c) && !isClosing(c) && c != -1 && buffer.length() < length &&
- c != '[' &&
- c != '<' &&
- c != '(' &&
- c != '/' )
- {
- buffer.append( (char)c );
- c = pdfSource.read();
- }
- if (c != -1)
- {
- pdfSource.unread(c);
- }
- return buffer.toString();
- }
-
- /**
- * This will tell if the next character is a closing brace( close of PDF array ).
- *
- * @return true if the next byte is ']', false otherwise.
- *
- * @throws IOException If an IO error occurs.
- */
- protected boolean isClosing() throws IOException
- {
- return isClosing(pdfSource.peek());
- }
-
- /**
- * This will tell if the next character is a closing brace( close of PDF array ).
- *
- * @param c The character to check against end of line
- * @return true if the next byte is ']', false otherwise.
- */
- protected boolean isClosing(int c)
- {
- return c == ']';
- }
-
- /**
- * This will read bytes until the end of line marker occurs.
- *
- * @return The characters between the current position and the end of the line.
- *
- * @throws IOException If there is an error reading from the stream.
- */
- protected String readLine() throws IOException
- {
- int c = pdfSource.read();
- while(isWhitespace(c) && c != -1)
- {
- c = pdfSource.read();
- }
- StringBuffer buffer = new StringBuffer( 11 );
-
- while( !isEOL(c) && c != -1 )
- {
- buffer.append( (char)c );
- c = pdfSource.read();
- }
- while( isEOL(c) && c != -1 )
- {
- c = pdfSource.read();
- }
- if (c != -1)
- {
- pdfSource.unread(c);
- }
- return buffer.toString();
- }
-
- /**
- * This will tell if the next byte to be read is an end of line byte.
- *
- * @return true if the next byte is 0x0A or 0x0D.
- *
- * @throws IOException If there is an error reading from the stream.
- */
- protected boolean isEOL() throws IOException
- {
- return isEOL(pdfSource.peek());
- }
-
- /**
- * This will tell if the next byte to be read is an end of line byte.
- *
- * @param c The character to check against end of line
- * @return true if the next byte is 0x0A or 0x0D.
- */
- protected boolean isEOL(int c)
- {
- return c == 10 || c == 13;
- }
-
- /**
- * This will tell if the next byte is whitespace or not.
- *
- * @return true if the next byte in the stream is a whitespace character.
- *
- * @throws IOException If there is an error reading from the stream.
- */
- protected boolean isWhitespace() throws IOException
- {
- return isWhitespace( pdfSource.peek() );
- }
-
- /**
- * This will tell if the next byte is whitespace or not.
- *
- * @param c The character to check against whitespace
- *
- * @return true if the next byte in the stream is a whitespace character.
- */
- protected boolean isWhitespace( int c )
- {
- return c == 0 || c == 9 || c == 12 || c == 10
- || c == 13 || c == 32;
- }
-
- /**
- * This will skip all spaces and comments that are present.
- *
- * @throws IOException If there is an error reading from the stream.
- */
- protected void skipSpaces() throws IOException
- {
- //log( "skipSpaces() " + pdfSource );
- int c = pdfSource.read();
- // identical to, but faster as: isWhiteSpace(c) || c == 37
- while(c == 0 || c == 9 || c == 12 || c == 10
- || c == 13 || c == 32 || c == 37)//37 is the % character, a comment
- {
- if ( c == 37 )
- {
- // skip past the comment section
- c = pdfSource.read();
- while(!isEOL(c) && c != -1)
- {
- c = pdfSource.read();
- }
- }
- else
- {
- c = pdfSource.read();
- }
- }
- if (c != -1)
- {
- pdfSource.unread(c);
- }
- //log( "skipSpaces() done peek='" + (char)pdfSource.peek() + "'" );
- }
-
- /**
- * this will compare two byte arrays.
- *
- * @param first The first byte array to compare.
- * @param second The second byte array to compare.
- *
- * @return true if both arrays are the same AND forall i : first[i] = second[i]
- */
- private boolean cmpArray( byte[] first, byte[] second )
- {
- return cmpArray( first, 0, second );
- }
-
- /**
- * This will compare two arrays for equality.
- *
- * @param first The first array to compare.
- * @param firstOffset The first byte to start comparing.
- * @param second The second array to compare.
- */
- private boolean cmpArray( byte[] first, int firstOffset, byte[] second )
- {
- boolean retval = true;
- if( first.length-firstOffset >= second.length )
- {
- int arrayLength = second.length;
- for( int i =0; i<arrayLength && retval; i++ )
- {
- retval = retval && first[ firstOffset + i ] == second[ i ];
- }
- }
- else
- {
- retval = false;
- }
- return retval;
- }
-
- /**
- * This will read an integer from the stream.
- *
- * @return The integer that was read from the stream.
- *
- * @throws IOException If there is an error reading from the stream.
- */
- protected int readInt() throws IOException
- {
- skipSpaces();
- int retval = 0;
-
- int lastByte = 0;
- StringBuffer intBuffer = new StringBuffer();
- while( (lastByte = pdfSource.read() ) != 32 &&
- lastByte != 10 &&
- lastByte != 13 &&
- lastByte != 0 && //See sourceforge bug 853328
- lastByte != -1 )
- {
- intBuffer.append( (char)lastByte );
- }
- try
- {
- retval = Integer.parseInt( intBuffer.toString() );
- }
- catch( NumberFormatException e )
- {
- throw new IOException( "Error: Expected an integer type, actual='" + intBuffer + "'" );
- }
- return retval;
- }
-
- /**
- * This will add an xref.
- *
- * @param xref The xref to add.
- */
- public void addXref( PDFXref xref )
- {
- xrefs.add(xref);
- }
-
- /**
- * This will get all of the xrefs.
- *
- * @return A list of all xrefs.
- */
- public List getXrefs()
- {
- return xrefs;
- }
-
- /**
- * This will set the xrefs for this parser.
- *
- * @param newXrefs The xrefs for this parser.
- */
- private void setXrefs( List newXrefs )
- {
- xrefs = newXrefs;
- }
-}
\ No newline at end of file |