# PDType3CharProc.java

    /*
     * 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 org.apache.pdfbox.pdmodel.font;

    import java.io.IOException;
    import java.io.InputStream;
    import java.util.ArrayList;
    import java.util.List;
    import org.apache.commons.logging.Log;
    import org.apache.commons.logging.LogFactory;
    import org.apache.pdfbox.contentstream.PDContentStream;
    import org.apache.pdfbox.contentstream.operator.Operator;
    import org.apache.pdfbox.cos.COSBase;
    import org.apache.pdfbox.cos.COSDictionary;
    import org.apache.pdfbox.cos.COSName;
    import org.apache.pdfbox.cos.COSNumber;
    import org.apache.pdfbox.cos.COSStream;
    import org.apache.pdfbox.io.RandomAccessRead;
    import org.apache.pdfbox.pdfparser.PDFStreamParser;
    import org.apache.pdfbox.pdmodel.PDResources;
    import org.apache.pdfbox.pdmodel.common.COSObjectable;
    import org.apache.pdfbox.pdmodel.common.PDRectangle;
    import org.apache.pdfbox.pdmodel.common.PDStream;
    import org.apache.pdfbox.util.Matrix;

    /**
     * A Type 3 character procedure. This is a standalone PDF content stream.
     *
     * @author John Hewson
     */
    public final class PDType3CharProc implements COSObjectable, PDContentStream
    {
        private static final Log LOG = LogFactory.getLog(PDType3CharProc.class);

        private final PDType3Font font;
        private final COSStream charStream;

        public PDType3CharProc(PDType3Font font, COSStream charStream)
        {
            this.font = font;
            this.charStream = charStream;
        }

        @Override
        public COSStream getCOSObject()
        {
            return charStream;
        }

        public PDType3Font getFont()
        {
            return font;
        }

        public PDStream getContentStream()
        {
            return new PDStream(charStream);
        }

        @Override
        public InputStream getContents() throws IOException
        {
            return charStream.createInputStream();
        }

        @Override
        public RandomAccessRead getContentsForRandomAccess() throws IOException
        {
            return charStream.createView();
        }

        @Override
        public PDResources getResources()
        {
            if (charStream.containsKey(COSName.RESOURCES))
            {
                // PDFBOX-5294
                LOG.warn("Using resources dictionary found in charproc entry");
                LOG.warn("This should have been in the font or in the page dictionary");
                return new PDResources((COSDictionary) charStream.getDictionaryObject(COSName.RESOURCES));
            }
            return font.getResources();
        }

        @Override
        public PDRectangle getBBox()
        {
            return font.getFontBBox();
        }

        /**
         * Calculate the bounding box of this glyph. This will work only if the first operator in the
         * stream is d1.
         *
         * @return the bounding box of this glyph, or null if the first operator is not d1.
         * @throws IOException If an io error occurs while parsing the stream.
         */
        public PDRectangle getGlyphBBox() throws IOException
        {
            List<COSBase> arguments = new ArrayList<>();
            PDFStreamParser parser = new PDFStreamParser(this);
            Object token = parser.parseNextToken();
            while (token != null)
            {
                if (token instanceof Operator)
                {
                    if (((Operator) token).getName().equals("d1") && arguments.size() == 6)
                    {
                        for (int i = 0; i < 6; ++i)
                        {
                            if (!(arguments.get(i) instanceof COSNumber))
                            {
                                return null;
                            }
                        }
                        float x = ((COSNumber) arguments.get(2)).floatValue();
                        float y = ((COSNumber) arguments.get(3)).floatValue();
                        return new PDRectangle(
                                x,
                                y,
                                ((COSNumber) arguments.get(4)).floatValue() - x,
                                ((COSNumber) arguments.get(5)).floatValue() - y);
                    }
                    else
                    {
                        return null;
                    }
                }
                else
                {
                    arguments.add((COSBase) token);
                }
                token = parser.parseNextToken();
            }
            return null;
        }

        @Override
        public Matrix getMatrix()
        {
            return font.getFontMatrix();
        }

        /**
         * Get the width from a type3 charproc stream.
         *
         * @return the glyph width.
         * @throws IOException if the stream could not be read, or did not have d0 or d1 as first
         * operator, or if their first argument was not a number.
         */
        public float getWidth() throws IOException
        {
            List<COSBase> arguments = new ArrayList<>();
            PDFStreamParser parser = new PDFStreamParser(this);
            Object token = parser.parseNextToken();
            while (token != null)
            {
                if (token instanceof Operator)
                {
                    return parseWidth((Operator) token, arguments);
                }
                else
                {
                    arguments.add((COSBase) token);
                }
                token = parser.parseNextToken();
            }
            throw new IOException("Unexpected end of stream");
        }

        private float parseWidth(Operator operator, List<COSBase> arguments) throws IOException
        {
            if (operator.getName().equals("d0") || operator.getName().equals("d1"))
            {
                COSBase obj = arguments.get(0);
                if (obj instanceof COSNumber)
                {
                    return ((COSNumber) obj).floatValue();
                }
                throw new IOException("Unexpected argument type: " + obj.getClass().getName());
            }
            else
            {
                throw new IOException("First operator must be d0 or d1");
            }
        }
    }