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, 1369 insertions, 0 deletions
diff --git a/src/main/java/org/pdfbox/pdfparser/BaseParser.java b/src/main/java/org/pdfbox/pdfparser/BaseParser.java new file mode 100644 index 0000000..3937025 --- /dev/null +++ b/src/main/java/org/pdfbox/pdfparser/BaseParser.java @@ -0,0 +1,1369 @@ +/**
+ * 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 |