diff options
Diffstat (limited to 'src/main/java/org/pdfbox/ttf/CMAPEncodingEntry.java')
| -rw-r--r-- | src/main/java/org/pdfbox/ttf/CMAPEncodingEntry.java | 219 |
1 files changed, 219 insertions, 0 deletions
diff --git a/src/main/java/org/pdfbox/ttf/CMAPEncodingEntry.java b/src/main/java/org/pdfbox/ttf/CMAPEncodingEntry.java new file mode 100644 index 0000000..a740203 --- /dev/null +++ b/src/main/java/org/pdfbox/ttf/CMAPEncodingEntry.java @@ -0,0 +1,219 @@ +/**
+ * Copyright (c) 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.ttf;
+
+import java.io.IOException;
+
+/**
+ * An encoding entry for a cmap.
+ *
+ * @author Ben Litchfield (ben@csh.rit.edu)
+ * @version $Revision: 1.1 $
+ */
+public class CMAPEncodingEntry
+{
+
+ private int platformId;
+ private int platformEncodingId;
+ private long subTableOffset;
+ private int[] glyphIdToCharacterCode;
+ /**
+ * This will read the required data from the stream.
+ *
+ * @param ttf The font that is being read.
+ * @param data The stream to read the data from.
+ * @throws IOException If there is an error reading the data.
+ */
+ public void initData( TrueTypeFont ttf, TTFDataStream data ) throws IOException
+ {
+ platformId = data.readUnsignedShort();
+ platformEncodingId = data.readUnsignedShort();
+ subTableOffset = data.readUnsignedInt();
+ }
+
+ /**
+ * This will read the required data from the stream.
+ *
+ * @param ttf The font that is being read.
+ * @param data The stream to read the data from.
+ * @throws IOException If there is an error reading the data.
+ */
+ public void initSubtable( TrueTypeFont ttf, TTFDataStream data ) throws IOException
+ {
+ data.seek( ttf.getCMAP().getOffset() + subTableOffset );
+ int subtableFormat = data.readUnsignedShort();
+ int length = data.readUnsignedShort();
+ int version = data.readUnsignedShort();
+ int numGlyphs = ttf.getMaximumProfile().getNumGlyphs();
+ if( subtableFormat == 0 )
+ {
+ byte[] glyphMapping = data.read( 256 );
+ glyphIdToCharacterCode = new int[256];
+ for( int i=0;i<glyphMapping.length; i++ )
+ {
+ glyphIdToCharacterCode[i]=(glyphMapping[i]+256)%256;
+ }
+ }
+ else if( subtableFormat == 2 )
+ {
+ int[] subHeaderKeys = new int[256];
+ for( int i=0; i<256; i++)
+ {
+ subHeaderKeys[i] = data.readUnsignedShort();
+ }
+ int firstCode = data.readUnsignedShort();
+ int entryCount = data.readUnsignedShort();
+ short idDelta = data.readSignedShort();
+ int idRangeOffset = data.readUnsignedShort();
+ //BJL
+ //HMM the TTF spec is not very clear about what is suppose to
+ //happen here. If you know please submit a patch or point
+ //me to some better documentation.
+ throw new IOException( "Not yet implemented:" + subtableFormat );
+ }
+ else if( subtableFormat == 4 )
+ {
+ int segCountX2 = data.readUnsignedShort();
+ int segCount = segCountX2/2;
+ int searchRange = data.readUnsignedShort();
+ int entrySelector = data.readUnsignedShort();
+ int rangeShift = data.readUnsignedShort();
+ int[] endCount = data.readUnsignedShortArray( segCount );
+ int reservedPad = data.readUnsignedShort();
+ int[] startCount = data.readUnsignedShortArray( segCount );
+ int[] idDelta = data.readUnsignedShortArray( segCount );
+ int[] idRangeOffset = data.readUnsignedShortArray( segCount );
+
+ //this is the final result
+ //key=glyphId, value is character codes
+ glyphIdToCharacterCode = new int[numGlyphs];
+
+ long currentPosition = data.getCurrentPosition();
+
+ for( int i=0; i<segCount; i++ )
+ {
+ int start = startCount[i];
+ int end = endCount[i];
+ int delta = idDelta[i];
+ int rangeOffset = idRangeOffset[i];
+ if( start != 65536 && end != 65536 )
+ {
+ for( int j=start; j<=end; j++ )
+ {
+ if( rangeOffset == 0 )
+ {
+ glyphIdToCharacterCode[ ((j+delta)%65536) ]=j;
+ }
+ else
+ {
+ long glyphOffset = currentPosition +
+ ((rangeOffset/2) + //idRangeOffset[i]/2
+ (j-start) + //(c - startCount[i])
+ (i-segCount))*2; //&idRangeOffset[i]);
+ data.seek( glyphOffset );
+ int glyphIndex = data.readUnsignedShort();
+ if( glyphIndex != 0 )
+ {
+ glyphIndex += delta;
+ glyphIndex = glyphIndex % 65536;
+ if( glyphIdToCharacterCode[glyphIndex] == 0 )
+ {
+ glyphIdToCharacterCode[glyphIndex] = j;
+ }
+ }
+
+ }
+ }
+ }
+ }
+ }
+ else if( subtableFormat == 6 )
+ {
+ int firstCode = data.readUnsignedShort();
+ int entryCount = data.readUnsignedShort();
+ glyphIdToCharacterCode = new int[numGlyphs];
+ int[] glyphIdArray = data.readUnsignedShortArray( entryCount );
+ for( int i=0; i<entryCount; i++)
+ {
+ glyphIdToCharacterCode[glyphIdArray[i]] = firstCode+i;
+ }
+ }
+ else
+ {
+ throw new IOException( "Unknown cmap format:" + subtableFormat );
+ }
+ }
+
+
+ /**
+ * @return Returns the glyphIdToCharacterCode.
+ */
+ public int[] getGlyphIdToCharacterCode()
+ {
+ return glyphIdToCharacterCode;
+ }
+ /**
+ * @param glyphIdToCharacterCodeValue The glyphIdToCharacterCode to set.
+ */
+ public void setGlyphIdToCharacterCode(int[] glyphIdToCharacterCodeValue)
+ {
+ this.glyphIdToCharacterCode = glyphIdToCharacterCodeValue;
+ }
+
+ /**
+ * @return Returns the platformEncodingId.
+ */
+ public int getPlatformEncodingId()
+ {
+ return platformEncodingId;
+ }
+ /**
+ * @param platformEncodingIdValue The platformEncodingId to set.
+ */
+ public void setPlatformEncodingId(int platformEncodingIdValue)
+ {
+ this.platformEncodingId = platformEncodingIdValue;
+ }
+ /**
+ * @return Returns the platformId.
+ */
+ public int getPlatformId()
+ {
+ return platformId;
+ }
+ /**
+ * @param platformIdValue The platformId to set.
+ */
+ public void setPlatformId(int platformIdValue)
+ {
+ this.platformId = platformIdValue;
+ }
+}
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