diff options
Diffstat (limited to 'src/main/java/org/pdfbox/cmapparser/CMapParser.java')
| -rw-r--r-- | src/main/java/org/pdfbox/cmapparser/CMapParser.java | 285 |
1 files changed, 285 insertions, 0 deletions
diff --git a/src/main/java/org/pdfbox/cmapparser/CMapParser.java b/src/main/java/org/pdfbox/cmapparser/CMapParser.java new file mode 100644 index 0000000..5434bb7 --- /dev/null +++ b/src/main/java/org/pdfbox/cmapparser/CMapParser.java @@ -0,0 +1,285 @@ +/**
+ * Copyright (c) 2003-2004, 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.cmapparser;
+
+import java.io.FileInputStream;
+import java.io.InputStream;
+import java.io.IOException;
+import java.io.RandomAccessFile;
+
+import java.util.List;
+
+import org.pdfbox.cmaptypes.CMap;
+import org.pdfbox.cmaptypes.CodespaceRange;
+
+import org.pdfbox.cos.COSArray;
+import org.pdfbox.cos.COSName;
+import org.pdfbox.cos.COSNumber;
+import org.pdfbox.cos.COSString;
+
+import org.pdfbox.pdfparser.PDFStreamParser;
+
+import org.pdfbox.util.PDFOperator;
+
+/**
+ * This will parser a CMap stream.
+ *
+ * @author Ben Litchfield (ben@csh.rit.edu)
+ * @version $Revision: 1.10 $
+ */
+public class CMapParser
+{
+ private static final String BEGIN_CODESPACE_RANGE = "begincodespacerange";
+ private static final String BEGIN_BASE_FONT_CHAR = "beginbfchar";
+ private static final String BEGIN_BASE_FONT_RANGE = "beginbfrange";
+
+ private InputStream input;
+ private CMap result;
+ private RandomAccessFile file;
+
+ /**
+ * Creates a new instance of CMapParser.
+ *
+ * @param in The input stream to read data from.
+ * @param raf The random access file from the document
+ */
+ public CMapParser( InputStream in, RandomAccessFile raf )
+ {
+ input = in;
+ file = raf;
+ }
+
+ /**
+ * This will get the results of the parsing. parse() must be called first.
+ *
+ * @return The parsed CMap file.
+ */
+ public CMap getResult()
+ {
+ return result;
+ }
+
+ /**
+ * This will parse the stream and create a cmap object.
+ *
+ * @throws IOException If there is an error parsing the stream.
+ */
+ public void parse() throws IOException
+ {
+ result = new CMap();
+ PDFStreamParser parser = new PDFStreamParser( input, file );
+ parser.parse();
+ List tokens = parser.getTokens();
+ for( int i=0; i<tokens.size(); i++ )
+ {
+ Object token = tokens.get( i );
+ if( token instanceof PDFOperator )
+ {
+ PDFOperator op = (PDFOperator)token;
+ if( op.getOperation().equals( BEGIN_CODESPACE_RANGE ) )
+ {
+ COSNumber cosCount = (COSNumber)tokens.get( i-1 );
+ for( int j=0; j<cosCount.intValue(); j++ )
+ {
+ i++;
+ COSString startRange = (COSString)tokens.get( i );
+ i++;
+ COSString endRange = (COSString)tokens.get( i );
+ CodespaceRange range = new CodespaceRange();
+ range.setStart( startRange.getBytes() );
+ range.setEnd( endRange.getBytes() );
+ result.addCodespaceRange( range );
+ }
+ }
+ else if( op.getOperation().equals( BEGIN_BASE_FONT_CHAR ) )
+ {
+ COSNumber cosCount = (COSNumber)tokens.get( i-1 );
+ for( int j=0; j<cosCount.intValue(); j++ )
+ {
+ i++;
+ COSString inputCode = (COSString)tokens.get( i );
+ i++;
+ Object nextToken = tokens.get( i );
+ if( nextToken instanceof COSString )
+ {
+ byte[] bytes = ((COSString)nextToken).getBytes();
+ String value = createStringFromBytes( bytes );
+ result.addMapping( inputCode.getBytes(), value );
+ }
+ else if( nextToken instanceof COSName )
+ {
+ result.addMapping( inputCode.getBytes(), ((COSName)nextToken).getName() );
+ }
+ else
+ {
+ throw new IOException( "Error parsing CMap beginbfchar, expected{COSString " +
+ "or COSName} and not " + nextToken );
+ }
+ }
+ }
+ else if( op.getOperation().equals( BEGIN_BASE_FONT_RANGE ) )
+ {
+ COSNumber cosCount = (COSNumber)tokens.get( i-1 );
+
+ for( int j=0; j<cosCount.intValue(); j++ )
+ {
+ i++;
+ COSString startCode = (COSString)tokens.get( i );
+ i++;
+ COSString endCode = (COSString)tokens.get( i );
+ i++;
+ Object nextToken = tokens.get( i );
+ COSArray array = null;
+ if( nextToken instanceof COSArray )
+ {
+ array = (COSArray)nextToken;
+ }
+
+ byte[] startBytes = startCode.getBytes();
+ byte[] endBytes = endCode.getBytes();
+ byte[] tokenBytes = null;
+ if( array == null )
+ {
+ tokenBytes = ((COSString)nextToken).getBytes();
+ }
+ else
+ {
+ tokenBytes = ((COSString)array.getObject( 0 )).getBytes();
+ }
+
+ String value = null;
+
+ int arrayIndex = 0;
+ boolean done = false;
+ while( !done )
+ {
+ if( compare( startBytes, endBytes ) >= 0 )
+ {
+ done = true;
+ }
+ value = createStringFromBytes( tokenBytes );
+ result.addMapping( startBytes, value );
+ increment( startBytes );
+
+ if( array == null )
+ {
+ increment( tokenBytes );
+ }
+ else
+ {
+ if( arrayIndex < array.size() )
+ {
+ tokenBytes = ((COSString)array.getObject( arrayIndex++ )).getBytes();
+ }
+ }
+ }
+ }
+ }
+ }
+ }
+ }
+
+ private void increment( byte[] data )
+ {
+ increment( data, data.length-1 );
+ }
+
+ private void increment( byte[] data, int position )
+ {
+ if( position > 0 && (data[position]+256)%256 == 255 )
+ {
+ data[position]=0;
+ increment( data, position-1);
+ }
+ else
+ {
+ data[position] = (byte)(data[position]+1);
+ }
+ }
+
+ private String createStringFromBytes( byte[] bytes ) throws IOException
+ {
+ String retval = null;
+ if( bytes.length == 1 )
+ {
+ retval = new String( bytes );
+ }
+ else
+ {
+ retval = new String( bytes, "UTF-16BE" );
+ }
+ return retval;
+ }
+
+ private int compare( byte[] first, byte[] second )
+ {
+ int retval = 1;
+ boolean done = false;
+ for( int i=0; i<first.length && !done; i++ )
+ {
+ if( first[i] == second[i] )
+ {
+ //move to next position
+ }
+ else if( ((first[i]+256)%256) < ((second[i]+256)%256) )
+ {
+ done = true;
+ retval = -1;
+ }
+ else
+ {
+ done = true;
+ retval = 1;
+ }
+ }
+ return retval;
+ }
+
+ /**
+ * A simple class to test parsing of cmap files.
+ *
+ * @param args Some command line arguments.
+ *
+ * @throws Exception If there is an error parsing the file.
+ */
+ public static void main( String[] args ) throws Exception
+ {
+ if( args.length != 1 )
+ {
+ System.err.println( "usage: java org.pdfbox.cmapparser.CMapParser <CMAP File>" );
+ System.exit( -1 );
+ }
+ CMapParser parser = new CMapParser( new FileInputStream( args[0] ), null );
+ parser.parse();
+ CMap result = parser.getResult();
+ System.out.println( "Result:" + result );
+ }
+}
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