TTFParser


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31  package org.pdfbox.ttf;
32  
33  import java.io.File  ;
34  import java.io.IOException  ;
35  
36  import java.util.ArrayList  ;
37  import java.util.Iterator  ;
38  import java.util.List  ;
39  
40  /**
41   * A true type font file parser.
42   * 
43   * @author Ben Litchfield (ben@csh.rit.edu)
44   * @version $Revision: 1.2 $
45   */
46  public class TTFParser
47  {   
48      /**
49       * Parse a file and get a true type font.
50       * @param ttfFile The TTF file.
51       * @return A true type font.
52       * @throws IOException If there is an error parsing the true type font.
53       */
54      public TrueTypeFont parseTTF( String   ttfFile ) throws IOException  
55      {
56          RAFDataStream raf = new RAFDataStream( ttfFile, "r" );
57          return parseTTF( raf );
58      }
59      
60      /**
61       * Parse a file and get a true type font.
62       * @param ttfFile The TTF file.
63       * @return A true type font.
64       * @throws IOException If there is an error parsing the true type font.
65       */
66      public TrueTypeFont parseTTF( File   ttfFile ) throws IOException  
67      {
68          RAFDataStream raf = new RAFDataStream( ttfFile, "r" );
69          return parseTTF( raf );
70      }
71      
72      /**
73       * Parse a file and get a true type font.
74       * @param raf The TTF file.
75       * @return A true type font.
76       * @throws IOException If there is an error parsing the true type font.
77       */
78      public TrueTypeFont parseTTF( TTFDataStream raf ) throws IOException  
79      {
80          TrueTypeFont font = new TrueTypeFont( raf );
81          font.setVersion( raf.read32Fixed() );
82          int numberOfTables = raf.readUnsignedShort();
83          int searchRange = raf.readUnsignedShort();
84          int entrySelector = raf.readUnsignedShort();
85          int rangeShift = raf.readUnsignedShort();
86          for( int i=0; i<numberOfTables; i++ )
87          {
88              TTFTable table = readTableDirectory( raf );   
89              font.addTable( table );
90          }
91          List   initialized = new ArrayList  ();
92          //need to initialize a couple tables in a certain order
93          HeaderTable head = font.getHeader();
94          raf.seek( head.getOffset() );
95          head.initData( font, raf );
96          initialized.add( head );
97          
98          
99          HorizontalHeaderTable hh = font.getHorizontalHeader();
100         raf.seek( hh.getOffset() );
101         hh.initData( font, raf );
102         initialized.add( hh );
103         
104         MaximumProfileTable maxp = font.getMaximumProfile();
105         raf.seek( maxp.getOffset() );
106         maxp.initData( font, raf );
107         initialized.add( maxp );
108         
109         PostScriptTable post = font.getPostScript();
110         raf.seek( post.getOffset() );
111         post.initData( font, raf );
112         initialized.add( post );
113         
114         IndexToLocationTable loc = font.getIndexToLocation();
115         raf.seek( loc.getOffset() );
116         loc.initData( font, raf );
117         initialized.add( loc );
118         
119         Iterator   iter = font.getTables().iterator();
120         while( iter.hasNext() )
121         {
122             TTFTable table = (TTFTable)iter.next();
123             if( !initialized.contains( table ) )
124             {
125                 raf.seek( table.getOffset() );
126                 table.initData( font, raf );
127             }
128         }
129         return font;
130     }
131     
132     private TTFTable readTableDirectory( TTFDataStream raf ) throws IOException  
133     {
134         TTFTable retval = null;
135         String   tag = raf.readString( 4 );
136         if( tag.equals( CMAPTable.TAG ) )
137         {
138             retval = new CMAPTable();
139         }
140         else if( tag.equals( GlyphTable.TAG ) )
141         {
142             retval = new GlyphTable();
143         }
144         else if( tag.equals( HeaderTable.TAG ) )
145         {
146             retval = new HeaderTable();
147         }
148         else if( tag.equals( HorizontalHeaderTable.TAG ) )
149         {
150             retval = new HorizontalHeaderTable();
151         }
152         else if( tag.equals( HorizontalMetricsTable.TAG ) )
153         {
154             retval = new HorizontalMetricsTable();
155         }
156         else if( tag.equals( IndexToLocationTable.TAG ) )
157         {
158             retval = new IndexToLocationTable();
159         }
160         else if( tag.equals( MaximumProfileTable.TAG ) )
161         {
162             retval = new MaximumProfileTable();
163         }
164         else if( tag.equals( NamingTable.TAG ) )
165         {
166             retval = new NamingTable();
167         }
168         else if( tag.equals( OS2WindowsMetricsTable.TAG ) )
169         {
170             retval = new OS2WindowsMetricsTable();
171         }
172         else if( tag.equals( PostScriptTable.TAG ) )
173         {
174             retval = new PostScriptTable();
175         }
176         else if( tag.equals( GlyphTable.TAG ) )
177         {
178             retval = new GlyphTable();
179         }
180         else if( tag.equals( GlyphTable.TAG ) )
181         {
182             retval = new GlyphTable();
183         }
184         else if( tag.equals( DigitalSignatureTable.TAG ) )
185         {
186             retval = new DigitalSignatureTable();
187         }
188         else
189         {
190             //unknown table type but read it anyway.
191             retval = new TTFTable();
192         }
193         retval.setTag( tag );
194         retval.setCheckSum( raf.readUnsignedInt() );
195         retval.setOffset( raf.readUnsignedInt() );
196         retval.setLength( raf.readUnsignedInt() );
197         return retval;
198     }
199 }
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