diff options
Diffstat (limited to 'src/main/java/org/pdfbox/encoding/Encoding.java')
| -rw-r--r-- | src/main/java/org/pdfbox/encoding/Encoding.java | 268 |
1 files changed, 268 insertions, 0 deletions
diff --git a/src/main/java/org/pdfbox/encoding/Encoding.java b/src/main/java/org/pdfbox/encoding/Encoding.java new file mode 100644 index 0000000..dc6387d --- /dev/null +++ b/src/main/java/org/pdfbox/encoding/Encoding.java @@ -0,0 +1,268 @@ +/**
+ * 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.encoding;
+
+import java.io.BufferedReader;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.IOException;
+
+import java.util.HashMap;
+import java.util.Iterator;
+import java.util.Map;
+import java.util.StringTokenizer;
+
+import org.pdfbox.cos.COSName;
+
+import org.pdfbox.util.ResourceLoader;
+
+import org.apache.log4j.Logger;
+
+import org.pdfbox.pdmodel.common.COSObjectable;
+
+/**
+ * This is an interface to a text encoder.
+ *
+ * @author Ben Litchfield
+ * @version $Revision: 1.13 $
+ */
+public abstract class Encoding implements COSObjectable
+{
+
+
+ /**
+ * This is a mapping from a character code to a character name.
+ */
+ protected Map codeToName = new HashMap();
+ /**
+ * This is a mapping from a character name to a character code.
+ */
+ protected Map nameToCode = new HashMap();
+
+ private static final Map NAME_TO_CHARACTER = new HashMap();
+ private static final Map CHARACTER_TO_NAME = new HashMap();
+
+ private static Logger log = Logger.getLogger( Encoding.class );
+
+ static
+ {
+ BufferedReader glyphStream = null;
+ try
+ {
+ InputStream resource = ResourceLoader.loadResource( "Resources/glyphlist.txt" );
+ glyphStream = new BufferedReader( new InputStreamReader( resource ) );
+ String line = null;
+ while( (line = glyphStream.readLine()) != null )
+ {
+ line = line.trim();
+ //lines starting with # are comments which we can ignore.
+ if( !line.startsWith("#" ) )
+ {
+ int semicolonIndex = line.indexOf( ';' );
+ if( semicolonIndex >= 0 )
+ {
+ try
+ {
+ String characterName = line.substring( 0, semicolonIndex );
+ String unicodeValue = line.substring( semicolonIndex+1, line.length() );
+ StringTokenizer tokenizer = new StringTokenizer( unicodeValue, " ", false );
+ String value = "";
+ while(tokenizer.hasMoreTokens())
+ {
+ int characterCode = Integer.parseInt( tokenizer.nextToken(), 16 );
+ value += (char)characterCode;
+ }
+
+ NAME_TO_CHARACTER.put( COSName.getPDFName( characterName ), value );
+ }
+ catch( NumberFormatException nfe )
+ {
+ log.error( "Error parsing line '" + line + "' ", nfe );
+ }
+ }
+ }
+ }
+ }
+ catch( IOException io )
+ {
+ log.error( "Error reading Resources/glyphlist.txt", io );
+ }
+ finally
+ {
+ if( glyphStream != null )
+ {
+ try
+ {
+ glyphStream.close();
+ }
+ catch( IOException e )
+ {
+ log.warn( "Error closing stream", e );
+ }
+
+ }
+ }
+
+
+ NAME_TO_CHARACTER.put( COSName.getPDFName( ".notdef" ), "" );
+ NAME_TO_CHARACTER.put( COSName.getPDFName( "fi" ), "fi" );
+ NAME_TO_CHARACTER.put( COSName.getPDFName( "fl" ), "fl" );
+ NAME_TO_CHARACTER.put( COSName.getPDFName( "ffi" ), "ffi" );
+ NAME_TO_CHARACTER.put( COSName.getPDFName( "ff" ), "ff" );
+ NAME_TO_CHARACTER.put( COSName.getPDFName( "pi" ), "pi" );
+
+ Iterator keys = NAME_TO_CHARACTER.keySet().iterator();
+ while( keys.hasNext() )
+ {
+ Object key = keys.next();
+ Object value = NAME_TO_CHARACTER.get( key );
+ CHARACTER_TO_NAME.put( value, key );
+ }
+ }
+
+
+ /**
+ * This will add a character encoding.
+ *
+ * @param code The character code that matches the character.
+ * @param name The name of the character.
+ */
+ protected void addCharacterEncoding( int code, COSName name )
+ {
+ Integer intCode = new Integer( code );
+ codeToName.put( intCode, name );
+ nameToCode.put( name, intCode );
+ }
+
+ /**
+ * This will get the character code for the name.
+ *
+ * @param name The name of the character.
+ *
+ * @return The code for the character.
+ *
+ * @throws IOException If there is no character code for the name.
+ */
+ public int getCode( COSName name ) throws IOException
+ {
+ Integer code = (Integer)nameToCode.get( name );
+ if( code == null )
+ {
+ throw new IOException( "No character code for character name '" + name.getName() + "'" );
+ }
+ return code.intValue();
+ }
+
+ /**
+ * This will take a character code and get the name from the code.
+ *
+ * @param code The character code.
+ *
+ * @return The name of the character.
+ *
+ * @throws IOException If there is no name for the code.
+ */
+ public COSName getName( int code ) throws IOException
+ {
+ COSName name = (COSName)codeToName.get( new Integer( code ) );
+ if( name == null )
+ {
+ //lets be forgiving for now
+ name = COSName.getPDFName( "space" );
+ //throw new IOException( getClass().getName() +
+ // ": No name for character code '" + code + "'" );
+ }
+ if( log.isDebugEnabled() )
+ {
+ log.debug( "Encoding.getName( " + code + " )=" + name );
+ }
+ return name;
+ }
+
+ /**
+ * This will take a character code and get the name from the code.
+ *
+ * @param c The character.
+ *
+ * @return The name of the character.
+ *
+ * @throws IOException If there is no name for the character.
+ */
+ public COSName getNameFromCharacter( char c ) throws IOException
+ {
+ COSName name = (COSName)CHARACTER_TO_NAME.get( "" + c );
+ if( name == null )
+ {
+ throw new IOException( "No name for character '" + c + "'" );
+ }
+ return name;
+ }
+
+ /**
+ * This will get the character from the code.
+ *
+ * @param code The character code.
+ *
+ * @return The printable character for the code.
+ *
+ * @throws IOException If there is not name for the character.
+ */
+ public String getCharacter( int code ) throws IOException
+ {
+ String character = getCharacter( getName( code ) );
+ if( log.isDebugEnabled() )
+ {
+ log.debug( "Encoding.getCharacter( " + code + " )=" + character );
+ }
+ return character;
+ }
+
+ /**
+ * This will get the character from the name.
+ *
+ * @param name The name of the character.
+ *
+ * @return The printable character for the code.
+ */
+ public static String getCharacter( COSName name )
+ {
+ String character = (String)NAME_TO_CHARACTER.get( name );
+ if( character == null )
+ {
+ character = name.getName();
+ }
+ if( log.isDebugEnabled() )
+ {
+ log.debug( "Encoding.getCharacter(" + name + ")=" + character );
+ }
+ return character;
+ }
+}
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