com.itextpdf.io.font.cmap.CMapToUnicode Maven / Gradle / Ivy
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Authors: Bruno Lowagie, Paulo Soares, et al.
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it under the terms of the GNU Affero General Public License version 3
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or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU Affero General Public License for more details.
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package com.itextpdf.io.font.cmap;
import com.itextpdf.io.logs.IoLogMessageConstant;
import com.itextpdf.io.util.IntHashtable;
import com.itextpdf.io.util.TextUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
/**
* This class represents a CMap file.
*
* @author Ben Litchfield ([email protected])
*/
public class CMapToUnicode extends AbstractCMap {
public static CMapToUnicode EmptyCMapToUnicodeMap = new CMapToUnicode(true);
private Map byteMappings;
private CMapToUnicode(boolean emptyCMap) {
byteMappings = Collections.emptyMap();
}
/**
* Creates a new instance of CMap.
*/
public CMapToUnicode() {
byteMappings = new HashMap<>();
}
public static CMapToUnicode getIdentity() {
CMapToUnicode uni = new CMapToUnicode();
for (int i = 0; i < 65537; i++) {
uni.addChar(i, TextUtil.convertFromUtf32(i));
}
return uni;
}
/**
* This will tell if this cmap has any two byte mappings.
*
* @return true If there are any two byte mappings, false otherwise.
*/
public boolean hasByteMappings() {
return byteMappings.size() != 0;
}
/**
* This will perform a lookup into the map.
*
* @param code The code used to lookup.
* @param offset The offset into the byte array.
* @param length The length of the data we are getting.
* @return The string that matches the lookup.
*/
public char[] lookup(byte[] code, int offset, int length) {
char[] result = null;
int key;
if (length == 1) {
key = code[offset] & 0xff;
result = byteMappings.get(key);
} else if (length == 2) {
int intKey = code[offset] & 0xff;
intKey <<= 8;
intKey += code[offset + 1] & 0xff;
key = intKey;
result = byteMappings.get(key);
}
return result;
}
public char[] lookup(byte[] code) {
return lookup(code, 0, code.length);
}
public char[] lookup(int code) {
return byteMappings.get(code);
}
public Set getCodes() {
return byteMappings.keySet();
}
public IntHashtable createDirectMapping() {
IntHashtable result = new IntHashtable();
for (Map.Entry entry : byteMappings.entrySet()) {
if (entry.getValue().length == 1) {
result.put((int) entry.getKey(), convertToInt(entry.getValue()));
}
}
return result;
}
public Map createReverseMapping() {
Map result = new HashMap<>();
for (Map.Entry entry : byteMappings.entrySet()) {
if (entry.getValue().length == 1) {
result.put(convertToInt(entry.getValue()), entry.getKey());
}
}
return result;
}
private int convertToInt(char[] s) {
int value = 0;
for (int i = 0; i < s.length - 1; i++) {
value += s[i];
value <<= 8;
}
value += s[s.length - 1];
return value;
}
void addChar(int cid, char[] uni) {
byteMappings.put(cid, uni);
}
@Override
void addChar(String mark, CMapObject code) {
if (mark.length() == 1) {
char[] dest = createCharsFromDoubleBytes((byte[]) code.getValue());
byteMappings.put((int) mark.charAt(0), dest);
} else if (mark.length() == 2) {
char[] dest = createCharsFromDoubleBytes((byte[]) code.getValue());
byteMappings.put((mark.charAt(0) << 8) + mark.charAt(1), dest);
} else {
Logger logger = LoggerFactory.getLogger(CMapToUnicode.class);
logger.warn(IoLogMessageConstant.TOUNICODE_CMAP_MORE_THAN_2_BYTES_NOT_SUPPORTED);
}
}
private char[] createCharsFromSingleBytes(byte[] bytes) {
if (bytes.length == 1) {
return new char[]{(char) (bytes[0] & 0xff)};
} else {
char[] chars = new char[bytes.length];
for (int i = 0; i < bytes.length; i++) {
chars[i] = (char) (bytes[i] & 0xff);
}
return chars;
}
}
private char[] createCharsFromDoubleBytes(byte[] bytes) {
char[] chars = new char[bytes.length / 2];
for (int i = 0; i < bytes.length; i+=2) {
chars[i/2] = (char)(((bytes[i] & 0xff) << 8) + (bytes[i+1] & 0xff));
}
return chars;
}
}