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    • com.lowagie.text.pdf.fonts.cmaps.CMapParser Maven / Gradle / Ivy

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    /**
 * Copyright (c) 2005-2006, www.fontbox.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 fontbox; 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.fontbox.org
 */
package com.lowagie.text.pdf.fonts.cmaps;

import com.lowagie.text.error_messages.MessageLocalization;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PushbackInputStream;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * This will parser a CMap stream.
 *
 * @author Ben Litchfield
 * @version $Revision: 4065 $
 * @since 2.1.4
 */
public class CMapParser {

    private static final String BEGIN_CODESPACE_RANGE = "begincodespacerange";
    private static final String BEGIN_BASE_FONT_CHAR = "beginbfchar";
    private static final String BEGIN_BASE_FONT_RANGE = "beginbfrange";

    private static final String MARK_END_OF_DICTIONARY = ">>";
    private static final String MARK_END_OF_ARRAY = "]";

    private byte[] tokenParserByteBuffer = new byte[512];

    /**
     * Creates a new instance of CMapParser.
     */
    public CMapParser() {
    }

    /**
     * A simple class to test parsing of cmap files.
     *
     * @param args Some command line arguments.
     * @throws Exception If there is an error parsing the file.
     */
    public static void main(String[] args) throws Exception {
        if (args.length != 1) {
            System.err.println("usage: java org.pdfbox.cmapparser.CMapParser ");
            System.exit(-1);
        }
        CMapParser parser = new CMapParser();
        CMap result = parser.parse(new FileInputStream(args[0]));
        System.out.println("Result:" + result);
    }

    /**
     * This will parse the stream and create a cmap object.
     *
     * @param input The CMAP stream to parse.
     * @return The parsed stream as a java object.
     * @throws IOException If there is an error parsing the stream.
     */
    public CMap parse(InputStream input) throws IOException {
        PushbackInputStream cmapStream = new PushbackInputStream(input);
        CMap result = new CMap();
        Object previousToken = null;
        Object token = null;
        while ((token = parseNextToken(cmapStream)) != null) {
            if (token instanceof Operator) {
                Operator op = (Operator) token;
                switch (op.op) {
                    case BEGIN_CODESPACE_RANGE: {
                        Number cosCount = (Number) previousToken;
                        for (int j = 0; j < cosCount.intValue(); j++) {
                            byte[] startRange = (byte[]) parseNextToken(cmapStream);
                            byte[] endRange = (byte[]) parseNextToken(cmapStream);
                            CodespaceRange range = new CodespaceRange();
                            range.setStart(startRange);
                            range.setEnd(endRange);
                            result.addCodespaceRange(range);
                        }
                        break;
                    }
                    case BEGIN_BASE_FONT_CHAR: {
                        Number cosCount = (Number) previousToken;
                        for (int j = 0; j < cosCount.intValue(); j++) {
                            byte[] inputCode = (byte[]) parseNextToken(cmapStream);
                            Object nextToken = parseNextToken(cmapStream);
                            if (nextToken instanceof byte[]) {
                                byte[] bytes = (byte[]) nextToken;
                                String value = createStringFromBytes(bytes);
                                result.addMapping(inputCode, value);
                            } else if (nextToken instanceof LiteralName) {
                                result.addMapping(inputCode, ((LiteralName) nextToken).name);
                            } else {
                                throw new IOException(MessageLocalization.getComposedMessage(
                                        "error.parsing.cmap.beginbfchar.expected.cosstring.or.cosname.and.not.1",
                                        nextToken));
                            }
                        }
                        break;
                    }
                    case BEGIN_BASE_FONT_RANGE: {
                        Number cosCount = (Number) previousToken;

                        for (int j = 0; j < cosCount.intValue(); j++) {
                            byte[] startCode = (byte[]) parseNextToken(cmapStream);
                            byte[] endCode = (byte[]) parseNextToken(cmapStream);
                            Object nextToken = parseNextToken(cmapStream);
                            List array = null;
                            byte[] tokenBytes = null;
                            if (nextToken instanceof List) {
                                array = (List) nextToken;
                                tokenBytes = (byte[]) array.get(0);
                            } else {
                                tokenBytes = (byte[]) nextToken;
                            }

                            String value = null;

                            int arrayIndex = 0;
                            boolean done = false;
                            while (!done) {
                                if (compare(startCode, endCode) >= 0) {
                                    done = true;
                                }
                                value = createStringFromBytes(tokenBytes);
                                result.addMapping(startCode, value);
                                increment(startCode);

                                if (array == null) {
                                    increment(tokenBytes);
                                } else {
                                    arrayIndex++;
                                    if (arrayIndex < array.size()) {
                                        tokenBytes = (byte[]) array.get(arrayIndex);
                                    }
                                }
                            }
                        }
                        break;
                    }
                }
            }
            previousToken = token;
        }
        return result;
    }

    private Object parseNextToken(PushbackInputStream is) throws IOException {
        Object retval = null;
        int nextByte = is.read();
        //skip whitespace
        while (nextByte == 0x09 || nextByte == 0x20 || nextByte == 0x0D || nextByte == 0x0A) {
            nextByte = is.read();
        }
        switch (nextByte) {
            case '%': {
                //header operations, for now return the entire line
                //may need to smarter in the future
                StringBuffer buffer = new StringBuffer();
                buffer.append((char) nextByte);
                readUntilEndOfLine(is, buffer);
                retval = buffer.toString();
                break;
            }
            case '(': {
                StringBuilder buffer = new StringBuilder();
                int stringByte = is.read();

                while (stringByte != -1 && stringByte != ')') {
                    buffer.append((char) stringByte);
                    stringByte = is.read();
                }
                retval = buffer.toString();
                break;
            }
            case '>': {
                int secondCloseBrace = is.read();
                if (secondCloseBrace == '>') {
                    retval = MARK_END_OF_DICTIONARY;
                } else {
                    throw new IOException(
                            MessageLocalization.getComposedMessage("error.expected.the.end.of.a.dictionary"));
                }
                break;
            }
            case ']': {
                retval = MARK_END_OF_ARRAY;
                break;
            }
            case '[': {
                List list = new ArrayList<>();

                Object nextToken = parseNextToken(is);
                while (nextToken != MARK_END_OF_ARRAY) {
                    list.add(nextToken);
                    nextToken = parseNextToken(is);
                }
                retval = list;
                break;
            }
            case '<': {
                int theNextByte = is.read();
                if (theNextByte == '<') {
                    Map result = new HashMap<>();
                    //we are reading a dictionary
                    Object key = parseNextToken(is);
                    while (key instanceof LiteralName && key != MARK_END_OF_DICTIONARY) {
                        Object value = parseNextToken(is);
                        result.put(((LiteralName) key).name, value);
                        key = parseNextToken(is);
                    }
                    retval = result;
                } else {
                    //won't read more than 512 bytes

                    int multiplyer = 16;
                    int bufferIndex = -1;
                    while (theNextByte != -1 && theNextByte != '>') {
                        int intValue = 0;
                        if (theNextByte == ' ' || theNextByte == '\t' || theNextByte == '\n' || theNextByte == '\r'
                                || theNextByte == '\f') {
                            theNextByte = is.read();
                            continue;
                        } else if (theNextByte >= '0' && theNextByte <= '9') {
                            intValue = theNextByte - '0';
                        } else if (theNextByte >= 'A' && theNextByte <= 'F') {
                            intValue = 10 + theNextByte - 'A';
                        } else if (theNextByte >= 'a' && theNextByte <= 'f') {
                            intValue = 10 + theNextByte - 'a';
                        } else {
                            throw new IOException(MessageLocalization.getComposedMessage(
                                    "error.expected.hex.character.and.not.char.thenextbyte.1", theNextByte));
                        }
                        intValue *= multiplyer;
                        if (multiplyer == 16) {
                            bufferIndex++;
                            tokenParserByteBuffer[bufferIndex] = 0;
                            multiplyer = 1;
                        } else {
                            multiplyer = 16;
                        }
                        tokenParserByteBuffer[bufferIndex] += (byte) intValue;
                        theNextByte = is.read();
                    }
                    byte[] finalResult = new byte[bufferIndex + 1];
                    System.arraycopy(tokenParserByteBuffer, 0, finalResult, 0, bufferIndex + 1);
                    retval = finalResult;
                }
                break;
            }
            case '/': {
                StringBuilder buffer = new StringBuilder();
                int stringByte = is.read();

                while (!isWhitespaceOrEOF(stringByte)) {
                    buffer.append((char) stringByte);
                    stringByte = is.read();
                }
                retval = new LiteralName(buffer.toString());
                break;
            }
            case -1: {
                //EOF return null;
                break;
            }
            case '0':
            case '1':
            case '2':
            case '3':
            case '4':
            case '5':
            case '6':
            case '7':
            case '8':
            case '9': {
                StringBuilder buffer = new StringBuilder();
                buffer.append((char) nextByte);
                nextByte = is.read();

                while (!isWhitespaceOrEOF(nextByte) &&
                        (Character.isDigit((char) nextByte) ||
                                nextByte == '.')) {
                    buffer.append((char) nextByte);
                    nextByte = is.read();
                }
                is.unread(nextByte);
                String value = buffer.toString();
                if (value.indexOf('.') >= 0) {
                    retval = Double.valueOf(value);
                } else {
                    retval = Integer.valueOf(buffer.toString());
                }
                break;
            }
            default: {
                StringBuilder buffer = new StringBuilder();
                buffer.append((char) nextByte);
                nextByte = is.read();

                while (!isWhitespaceOrEOF(nextByte)) {
                    buffer.append((char) nextByte);
                    nextByte = is.read();
                }
                retval = new Operator(buffer.toString());

                break;
            }
        }
        return retval;
    }

    private void readUntilEndOfLine(InputStream is, StringBuffer buf) throws IOException {
        int nextByte = is.read();
        while (nextByte != -1 && nextByte != 0x0D && nextByte != 0x0A) {
            buf.append((char) nextByte);
            nextByte = is.read();
        }
    }

    private boolean isWhitespaceOrEOF(int aByte) {
        return aByte == -1 || aByte == 0x20 || aByte == 0x0D || aByte == 0x0A;
    }

    private void increment(byte[] data) {
        increment(data, data.length - 1);
    }

    private void increment(byte[] data, int position) {
        if (position > 0 && (data[position] + 256) % 256 == 255) {
            data[position] = 0;
            increment(data, position - 1);
        } else {
            data[position] = (byte) (data[position] + 1);
        }
    }

    private String createStringFromBytes(byte[] bytes) throws IOException {
        String retval = null;
        if (bytes.length == 1) {
            retval = new String(bytes);
        } else {
            retval = new String(bytes, StandardCharsets.UTF_16BE);
        }
        return retval;
    }

    private int compare(byte[] first, byte[] second) {
        int retval = 1;
        boolean done = false;
        for (int i = 0; i < first.length && !done; i++) {
            if (first[i] == second[i]) {
                //move to next position
            } else if (((first[i] + 256) % 256) < ((second[i] + 256) % 256)) {
                done = true;
                retval = -1;
            } else {
                done = true;
                retval = 1;
            }
        }
        return retval;
    }

    /**
     * Internal class.
     */
    private class LiteralName {

        private String name;

        private LiteralName(String theName) {
            name = theName;
        }
    }

    /**
     * Internal class.
     */
    private class Operator {

        private String op;

        private Operator(String theOp) {
            op = theOp;
        }
    }
}
    
    
    
    

    




    
    
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