/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.tom_roush.fontbox.ttf;
import android.util.Log;
import java.io.IOException;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;
/**
* A "cmap" subtable.
*
* @author Ben Litchfield
*/
public class CmapSubtable
{
private static final long LEAD_OFFSET = 0xD800 - (0x10000 >> 10);
private static final long SURROGATE_OFFSET = 0x10000 - (0xD800 << 10) - 0xDC00;
private int platformId;
private int platformEncodingId;
private long subTableOffset;
private int[] glyphIdToCharacterCode;
private final Map<Integer, Integer> characterCodeToGlyphId = new HashMap<Integer, Integer>();
/**
* This will read the required data from the stream.
*
* @param data The stream to read the data from.
* @throws IOException If there is an error reading the data.
*/
public void initData(TTFDataStream data) throws IOException
{
platformId = data.readUnsignedShort();
platformEncodingId = data.readUnsignedShort();
subTableOffset = data.readUnsignedInt();
}
/**
* This will read the required data from the stream.
*
* @param cmap the CMAP this encoding belongs to.
* @param numGlyphs number of glyphs.
* @param data The stream to read the data from.
* @throws IOException If there is an error reading the data.
*/
public void initSubtable(CmapTable cmap, int numGlyphs, TTFDataStream data) throws IOException
{
data.seek(cmap.getOffset() + subTableOffset);
int subtableFormat = data.readUnsignedShort();
long length;
long version;
if (subtableFormat < 8)
{
length = data.readUnsignedShort();
version = data.readUnsignedShort();
}
else
{
// read an other UnsignedShort to read a Fixed32
data.readUnsignedShort();
length = data.readUnsignedInt();
version = data.readUnsignedInt();
}
switch (subtableFormat)
{
case 0:
processSubtype0(data);
break;
case 2:
processSubtype2(data, numGlyphs);
break;
case 4:
processSubtype4(data, numGlyphs);
break;
case 6:
processSubtype6(data, numGlyphs);
break;
case 8:
processSubtype8(data, numGlyphs);
break;
case 10:
processSubtype10(data, numGlyphs);
break;
case 12:
processSubtype12(data, numGlyphs);
break;
case 13:
processSubtype13(data, numGlyphs);
break;
case 14:
processSubtype14(data, numGlyphs);
break;
default:
throw new IOException("Unknown cmap format:" + subtableFormat);
}
}
/**
* Reads a format 8 subtable.
*
* @param data the data stream of the to be parsed ttf font
* @param numGlyphs number of glyphs to be read
* @throws IOException If there is an error parsing the true type font.
*/
protected void processSubtype8(TTFDataStream data, int numGlyphs) throws IOException
{
// --- is32 is a 65536 BITS array ( = 8192 BYTES)
int[] is32 = data.readUnsignedByteArray(8192);
long nbGroups = data.readUnsignedInt();
// --- nbGroups shouldn't be greater than 65536
if (nbGroups > 65536)
{
throw new IOException("CMap ( Subtype8 ) is invalid");
}
glyphIdToCharacterCode = newGlyphIdToCharacterCode(numGlyphs);
// -- Read all sub header
for (long i = 0; i < nbGroups; ++i)
{
long firstCode = data.readUnsignedInt();
long endCode = data.readUnsignedInt();
long startGlyph = data.readUnsignedInt();
// -- process simple validation
if (firstCode > endCode || 0 > firstCode)
{
throw new IOException("Range invalid");
}
for (long j = firstCode; j <= endCode; ++j)
{
// -- Convert the Character code in decimal
if (j > Integer.MAX_VALUE)
{
throw new IOException("[Sub Format 8] Invalid Character code");
}
int currentCharCode;
if ((is32[(int) j / 8] & (1 << ((int) j % 8))) == 0)
{
currentCharCode = (int) j;
}
else
{
// the character code uses a 32bits format
// convert it in decimal : see http://www.unicode.org/faq//utf_bom.html#utf16-4
long lead = LEAD_OFFSET + (j >> 10);
long trail = 0xDC00 + (j & 0x3FF);
long codepoint = (lead << 10) + trail + SURROGATE_OFFSET;
if (codepoint > Integer.MAX_VALUE)
{
throw new IOException("[Sub Format 8] Invalid Character code");
}
currentCharCode = (int) codepoint;
}
long glyphIndex = startGlyph + (j - firstCode);
if (glyphIndex > numGlyphs || glyphIndex > Integer.MAX_VALUE)
{
throw new IOException("CMap contains an invalid glyph index");
}
glyphIdToCharacterCode[(int) glyphIndex] = currentCharCode;
characterCodeToGlyphId.put(currentCharCode, (int) glyphIndex);
}
}
}
/**
* Reads a format 10 subtable.
*
* @param data the data stream of the to be parsed ttf font
* @param numGlyphs number of glyphs to be read
* @throws IOException If there is an error parsing the true type font.
*/
protected void processSubtype10(TTFDataStream data, int numGlyphs) throws IOException
{
long startCode = data.readUnsignedInt();
long numChars = data.readUnsignedInt();
if (numChars > Integer.MAX_VALUE)
{
throw new IOException("Invalid number of Characters");
}
if (startCode < 0 || startCode > 0x0010FFFF || (startCode + numChars) > 0x0010FFFF
|| ((startCode + numChars) >= 0x0000D800 && (startCode + numChars) <= 0x0000DFFF))
{
throw new IOException("Invalid Characters codes");
}
}
/**
* Reads a format 12 subtable.
*
* @param data the data stream of the to be parsed ttf font
* @param numGlyphs number of glyphs to be read
* @throws IOException If there is an error parsing the true type font.
*/
protected void processSubtype12(TTFDataStream data, int numGlyphs) throws IOException
{
long nbGroups = data.readUnsignedInt();
glyphIdToCharacterCode = newGlyphIdToCharacterCode(numGlyphs);
for (long i = 0; i < nbGroups; ++i)
{
long firstCode = data.readUnsignedInt();
long endCode = data.readUnsignedInt();
long startGlyph = data.readUnsignedInt();
if (firstCode < 0 || firstCode > 0x0010FFFF ||
(firstCode >= 0x0000D800 && firstCode <= 0x0000DFFF))
{
throw new IOException("Invalid characters codes");
}
if ((endCode > 0 && endCode < firstCode) ||
endCode > 0x0010FFFF ||
(endCode >= 0x0000D800 && endCode <= 0x0000DFFF))
{
throw new IOException("Invalid characters codes");
}
for (long j = 0; j <= endCode - firstCode; ++j)
{
long glyphIndex = startGlyph + j;
if (glyphIndex >= numGlyphs)
{
throw new IOException("Character Code greater than Integer.MAX_VALUE");
}
if (firstCode + j > 0x10FFFF)
{
Log.w("PdfBox-Android", "Format 12 cmap contains character beyond UCS-4");
}
glyphIdToCharacterCode[(int) glyphIndex] = (int) (firstCode + j);
characterCodeToGlyphId.put((int) (firstCode + j), (int) glyphIndex);
}
}
}
/**
* Reads a format 13 subtable.
*
* @param data the data stream of the to be parsed ttf font
* @param numGlyphs number of glyphs to be read
* @throws IOException If there is an error parsing the true type font.
*/
protected void processSubtype13(TTFDataStream data, int numGlyphs) throws IOException
{
long nbGroups = data.readUnsignedInt();
for (long i = 0; i < nbGroups; ++i)
{
long firstCode = data.readUnsignedInt();
long endCode = data.readUnsignedInt();
long glyphId = data.readUnsignedInt();
if (glyphId > numGlyphs)
{
Log.w("PdfBox-Android", "Format 13 cmap contains an invalid glyph index");
break;
}
if (firstCode < 0 || firstCode > 0x0010FFFF || (firstCode >= 0x0000D800 && firstCode <= 0x0000DFFF))
{
throw new IOException("Invalid Characters codes");
}
if ((endCode > 0 && endCode < firstCode) || endCode > 0x0010FFFF
|| (endCode >= 0x0000D800 && endCode <= 0x0000DFFF))
{
throw new IOException("Invalid Characters codes");
}
for (long j = 0; j <= endCode - firstCode; ++j)
{
if (firstCode + j > Integer.MAX_VALUE)
{
throw new IOException("Character Code greater than Integer.MAX_VALUE");
}
if (firstCode + j > 0x10FFFF)
{
Log.w("PdfBox-Android", "Format 13 cmap contains character beyond UCS-4");
}
glyphIdToCharacterCode[(int) glyphId] = (int) (firstCode + j);
characterCodeToGlyphId.put((int) (firstCode + j), (int) glyphId);
}
}
}
/**
* Reads a format 14 subtable.
*
* @param data the data stream of the to be parsed ttf font
* @param numGlyphs number of glyphs to be read
* @throws IOException If there is an error parsing the true type font.
*/
protected void processSubtype14(TTFDataStream data, int numGlyphs) throws IOException
{
// Unicode Variation Sequences (UVS)
// see http://blogs.adobe.com/CCJKType/2013/05/opentype-cmap-table-ramblings.html
Log.w("PdfBox-Android", "Format 14 cmap table is not supported and will be ignored");
}
/**
* Reads a format 6 subtable.
*
* @param data the data stream of the to be parsed ttf font
* @param numGlyphs number of glyphs to be read
* @throws IOException If there is an error parsing the true type font.
*/
protected void processSubtype6(TTFDataStream data, int numGlyphs) throws IOException
{
int firstCode = data.readUnsignedShort();
int entryCount = data.readUnsignedShort();
Map<Integer, Integer> tmpGlyphToChar = new HashMap<Integer, Integer>();
int[] glyphIdArray = data.readUnsignedShortArray(entryCount);
for (int i = 0; i < entryCount; i++)
{
tmpGlyphToChar.put(glyphIdArray[i], firstCode + i);
characterCodeToGlyphId.put((firstCode + i), glyphIdArray[i]);
}
glyphIdToCharacterCode = newGlyphIdToCharacterCode(
Collections.max(tmpGlyphToChar.keySet()) + 1);
for (Entry<Integer, Integer> entry : tmpGlyphToChar.entrySet())
{
// link the glyphId with the right character code
glyphIdToCharacterCode[entry.getKey()] = entry.getValue();
}
}
/**
* Reads a format 4 subtable.
*
* @param data the data stream of the to be parsed ttf font
* @param numGlyphs number of glyphs to be read
* @throws IOException If there is an error parsing the true type font.
*/
protected void processSubtype4(TTFDataStream data, int numGlyphs) throws IOException
{
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);
Map<Integer, Integer> tmpGlyphToChar = new HashMap<Integer, Integer>();
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 != 65535 && end != 65535)
{
for (int j = start; j <= end; j++)
{
if (rangeOffset == 0)
{
int glyphid = (j + delta) % 65536;
tmpGlyphToChar.put(glyphid, j);
characterCodeToGlyphId.put(j, glyphid);
}
else
{
long glyphOffset = currentPosition + ((rangeOffset / 2) +
(j - start) +
(i - segCount)) * 2;
data.seek(glyphOffset);
int glyphIndex = data.readUnsignedShort();
if (glyphIndex != 0)
{
glyphIndex += delta;
glyphIndex %= 65536;
if (!tmpGlyphToChar.containsKey(glyphIndex))
{
tmpGlyphToChar.put(glyphIndex, j);
characterCodeToGlyphId.put(j, glyphIndex);
}
}
}
}
}
}
/*
* this is the final result key=glyphId, value is character codes Create an array that contains MAX(GlyphIds)
* element, or -1
*/
if (tmpGlyphToChar.isEmpty())
{
Log.w("PdfBox-Android", "cmap format 4 subtable is empty");
return;
}
glyphIdToCharacterCode = newGlyphIdToCharacterCode(Collections.max(tmpGlyphToChar.keySet()) + 1);
for (Entry<Integer, Integer> entry : tmpGlyphToChar.entrySet())
{
// link the glyphId with the right character code
glyphIdToCharacterCode[entry.getKey()] = entry.getValue();
}
}
/**
* Read a format 2 subtable.
*
* @param data the data stream of the to be parsed ttf font
* @param numGlyphs number of glyphs to be read
* @throws IOException If there is an error parsing the true type font.
*/
protected void processSubtype2(TTFDataStream data, int numGlyphs) throws IOException
{
int[] subHeaderKeys = new int[256];
// ---- keep the Max Index of the SubHeader array to know its length
int maxSubHeaderIndex = 0;
for (int i = 0; i < 256; i++)
{
subHeaderKeys[i] = data.readUnsignedShort();
maxSubHeaderIndex = Math.max(maxSubHeaderIndex, subHeaderKeys[i] / 8);
}
// ---- Read all SubHeaders to avoid useless seek on DataSource
SubHeader[] subHeaders = new SubHeader[maxSubHeaderIndex + 1];
for (int i = 0; i <= maxSubHeaderIndex; ++i)
{
int firstCode = data.readUnsignedShort();
int entryCount = data.readUnsignedShort();
short idDelta = data.readSignedShort();
int idRangeOffset = data.readUnsignedShort() - (maxSubHeaderIndex + 1 - i - 1) * 8 - 2;
subHeaders[i] = new SubHeader(firstCode, entryCount, idDelta, idRangeOffset);
}
long startGlyphIndexOffset = data.getCurrentPosition();
glyphIdToCharacterCode = newGlyphIdToCharacterCode(numGlyphs);
for (int i = 0; i <= maxSubHeaderIndex; ++i)
{
SubHeader sh = subHeaders[i];
int firstCode = sh.getFirstCode();
int idRangeOffset = sh.getIdRangeOffset();
int idDelta = sh.getIdDelta();
int entryCount = sh.getEntryCount();
data.seek(startGlyphIndexOffset + idRangeOffset);
for (int j = 0; j < entryCount; ++j)
{
// ---- compute the Character Code
int charCode = i;
charCode = (charCode << 8) + (firstCode + j);
// ---- Go to the CharacterCOde position in the Sub Array
// of the glyphIndexArray
// glyphIndexArray contains Unsigned Short so add (j * 2) bytes
// at the index position
int p = data.readUnsignedShort();
// ---- compute the glyphIndex
if (p > 0)
{
p = (p + idDelta) % 65536;
}
glyphIdToCharacterCode[p] = charCode;
characterCodeToGlyphId.put(charCode, p);
}
}
}
/**
* Initialize the CMapEntry when it is a subtype 0.
*
* @param data the data stream of the to be parsed ttf font
* @throws IOException If there is an error parsing the true type font.
*/
protected void processSubtype0(TTFDataStream data) throws IOException
{
byte[] glyphMapping = data.read(256);
glyphIdToCharacterCode = newGlyphIdToCharacterCode(256);
for (int i = 0; i < glyphMapping.length; i++)
{
int glyphIndex = (glyphMapping[i] + 256) % 256;
glyphIdToCharacterCode[glyphIndex] = i;
characterCodeToGlyphId.put(i, glyphIndex);
}
}
/**
* Workaround for the fact that glyphIdToCharacterCode doesn't distinguish between
* missing character codes and code 0.
*/
private int[] newGlyphIdToCharacterCode(int size)
{
int[] gidToCode = new int[size];
Arrays.fill(gidToCode, -1);
return gidToCode;
}
/**
* @return Returns the platformEncodingId.
*/
public int getPlatformEncodingId()
{
return platformEncodingId;
}
/**
* @param platformEncodingIdValue The platformEncodingId to set.
*/
public void setPlatformEncodingId(int platformEncodingIdValue)
{
platformEncodingId = platformEncodingIdValue;
}
/**
* @return Returns the platformId.
*/
public int getPlatformId()
{
return platformId;
}
/**
* @param platformIdValue The platformId to set.
*/
public void setPlatformId(int platformIdValue)
{
platformId = platformIdValue;
}
/**
* Returns the GlyphId linked with the given character code.
*
* @param characterCode the given character code to be mapped
* @return glyphId the corresponding glyph id for the given character code
*/
public int getGlyphId(int characterCode)
{
Integer glyphId = characterCodeToGlyphId.get(characterCode);
return glyphId == null ? 0 : glyphId;
}
/**
* Returns the character code for the given GID, or null if there is none.
*
* @param gid glyph id
* @return character code
*/
public Integer getCharacterCode(int gid)
{
if (gid < 0 || gid >= glyphIdToCharacterCode.length)
{
return null;
}
// workaround for the fact that glyphIdToCharacterCode doesn't distinguish between
// missing character codes and code 0.
int code = glyphIdToCharacterCode[gid];
if (code == -1)
{
return null;
}
return code;
}
@Override
public String toString()
{
return "{" + getPlatformId() + " " + getPlatformEncodingId() + "}";
}
/**
*
* Class used to manage CMap - Format 2.
*
*/
private class SubHeader
{
private final int firstCode;
private final int entryCount;
/**
* used to compute the GlyphIndex : P = glyphIndexArray.SubArray[pos] GlyphIndex = P + idDelta % 65536.
*/
private final short idDelta;
/**
* Number of bytes to skip to reach the firstCode in the glyphIndexArray.
*/
private final int idRangeOffset;
private SubHeader(int firstCodeValue, int entryCountValue, short idDeltaValue, int idRangeOffsetValue)
{
firstCode = firstCodeValue;
entryCount = entryCountValue;
idDelta = idDeltaValue;
idRangeOffset = idRangeOffsetValue;
}
/**
* @return the firstCode
*/
private int getFirstCode()
{
return firstCode;
}
/**
* @return the entryCount
*/
private int getEntryCount()
{
return entryCount;
}
/**
* @return the idDelta
*/
private short getIdDelta()
{
return idDelta;
}
/**
* @return the idRangeOffset
*/
private int getIdRangeOffset()
{
return idRangeOffset;
}
}
}