    001/*
    002 *  Licensed to the Apache Software Foundation (ASF) under one or more
    003 *  contributor license agreements.  See the NOTICE file distributed with
    004 *  this work for additional information regarding copyright ownership.
    005 *  The ASF licenses this file to You under the Apache License, Version 2.0
    006 *  (the "License"); you may not use this file except in compliance with
    007 *  the License.  You may obtain a copy of the License at
    008 *
    009 *     http://www.apache.org/licenses/LICENSE-2.0
    010 *
    011 *  Unless required by applicable law or agreed to in writing, software
    012 *  distributed under the License is distributed on an "AS IS" BASIS,
    013 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    014 *  See the License for the specific language governing permissions and
    015 *  limitations under the License.
    016 */
    017package org.apache.commons.compress.harmony.unpack200;
    018
    019import java.io.IOException;
    020import java.io.InputStream;
    021import java.util.ArrayList;
    022import java.util.Arrays;
    023import java.util.HashMap;
    024import java.util.Map;
    025
    026import org.apache.commons.compress.harmony.pack200.Codec;
    027import org.apache.commons.compress.harmony.pack200.Pack200Exception;
    028import org.apache.commons.compress.harmony.unpack200.bytecode.CPClass;
    029import org.apache.commons.compress.harmony.unpack200.bytecode.CPDouble;
    030import org.apache.commons.compress.harmony.unpack200.bytecode.CPFieldRef;
    031import org.apache.commons.compress.harmony.unpack200.bytecode.CPFloat;
    032import org.apache.commons.compress.harmony.unpack200.bytecode.CPInteger;
    033import org.apache.commons.compress.harmony.unpack200.bytecode.CPInterfaceMethodRef;
    034import org.apache.commons.compress.harmony.unpack200.bytecode.CPLong;
    035import org.apache.commons.compress.harmony.unpack200.bytecode.CPMethodRef;
    036import org.apache.commons.compress.harmony.unpack200.bytecode.CPNameAndType;
    037import org.apache.commons.compress.harmony.unpack200.bytecode.CPString;
    038import org.apache.commons.compress.harmony.unpack200.bytecode.CPUTF8;
    039
    040/**
    041 * Constant Pool bands
    042 */
    043public class CpBands extends BandSet {
    044
    045    private final SegmentConstantPool pool = new SegmentConstantPool(this);
    046
    047    private String[] cpClass;
    048
    049    private int[] cpClassInts;
    050    private int[] cpDescriptorNameInts;
    051    private int[] cpDescriptorTypeInts;
    052    private String[] cpDescriptor;
    053    private double[] cpDouble;
    054    private String[] cpFieldClass;
    055    private String[] cpFieldDescriptor;
    056    private int[] cpFieldClassInts;
    057    private int[] cpFieldDescriptorInts;
    058    private float[] cpFloat;
    059    private String[] cpIMethodClass;
    060    private String[] cpIMethodDescriptor;
    061    private int[] cpIMethodClassInts;
    062    private int[] cpIMethodDescriptorInts;
    063    private int[] cpInt;
    064    private long[] cpLong;
    065    private String[] cpMethodClass;
    066    private String[] cpMethodDescriptor;
    067    private int[] cpMethodClassInts;
    068    private int[] cpMethodDescriptorInts;
    069    private String[] cpSignature;
    070    private int[] cpSignatureInts;
    071    private String[] cpString;
    072    private int[] cpStringInts;
    073    private String[] cpUTF8;
    074    private final Map<String, CPUTF8> stringsToCPUTF8 = new HashMap<>();
    075
    076    private final Map<String, CPString> stringsToCPStrings = new HashMap<>();
    077    private final Map<Long, CPLong> longsToCPLongs = new HashMap<>();
    078    private final Map<Integer, CPInteger> integersToCPIntegers = new HashMap<>();
    079    private final Map<Float, CPFloat> floatsToCPFloats = new HashMap<>();
    080    private final Map<String, CPClass> stringsToCPClass = new HashMap<>();
    081    private final Map<Double, CPDouble> doublesToCPDoubles = new HashMap<>();
    082    private final Map<String, CPNameAndType> descriptorsToCPNameAndTypes = new HashMap<>();
    083    private Map<String, Integer> mapClass;
    084
    085    private Map<String, Integer> mapDescriptor;
    086    private Map<String, Integer> mapUTF8;
    087    // TODO: Not used
    088    private Map<String, Integer> mapSignature;
    089
    090    private int intOffset;
    091
    092    private int floatOffset;
    093    private int longOffset;
    094    private int doubleOffset;
    095    private int stringOffset;
    096    private int classOffset;
    097    private int signatureOffset;
    098    private int descrOffset;
    099    private int fieldOffset;
    100    private int methodOffset;
    101    private int imethodOffset;
    102    public CpBands(final Segment segment) {
    103        super(segment);
    104    }
    105
    106    public CPClass cpClassValue(final int index) {
    107        final String string = cpClass[index];
    108        final int utf8Index = cpClassInts[index];
    109        final int globalIndex = classOffset + index;
    110        return stringsToCPClass.computeIfAbsent(string, k -> new CPClass(cpUTF8Value(utf8Index), globalIndex));
    111    }
    112
    113    public CPClass cpClassValue(final String string) {
    114        CPClass cpString = stringsToCPClass.get(string);
    115        if (cpString == null) {
    116            final Integer index = mapClass.get(string);
    117            if (index != null) {
    118                return cpClassValue(index.intValue());
    119            }
    120            cpString = new CPClass(cpUTF8Value(string, false), -1);
    121            stringsToCPClass.put(string, cpString);
    122        }
    123        return cpString;
    124    }
    125
    126    public CPDouble cpDoubleValue(final int index) {
    127        final Double dbl = Double.valueOf(cpDouble[index]);
    128        CPDouble cpDouble = doublesToCPDoubles.get(dbl);
    129        if (cpDouble == null) {
    130            cpDouble = new CPDouble(dbl, index + doubleOffset);
    131            doublesToCPDoubles.put(dbl, cpDouble);
    132        }
    133        return cpDouble;
    134    }
    135
    136    public CPFieldRef cpFieldValue(final int index) {
    137        return new CPFieldRef(cpClassValue(cpFieldClassInts[index]), cpNameAndTypeValue(cpFieldDescriptorInts[index]),
    138            index + fieldOffset);
    139    }
    140
    141    public CPFloat cpFloatValue(final int index) {
    142        final Float f = Float.valueOf(cpFloat[index]);
    143        CPFloat cpFloat = floatsToCPFloats.get(f);
    144        if (cpFloat == null) {
    145            cpFloat = new CPFloat(f, index + floatOffset);
    146            floatsToCPFloats.put(f, cpFloat);
    147        }
    148        return cpFloat;
    149    }
    150
    151    public CPInterfaceMethodRef cpIMethodValue(final int index) {
    152        return new CPInterfaceMethodRef(cpClassValue(cpIMethodClassInts[index]),
    153            cpNameAndTypeValue(cpIMethodDescriptorInts[index]), index + imethodOffset);
    154    }
    155
    156    public CPInteger cpIntegerValue(final int index) {
    157        final Integer i = Integer.valueOf(cpInt[index]);
    158        CPInteger cpInteger = integersToCPIntegers.get(i);
    159        if (cpInteger == null) {
    160            cpInteger = new CPInteger(i, index + intOffset);
    161            integersToCPIntegers.put(i, cpInteger);
    162        }
    163        return cpInteger;
    164    }
    165
    166    public CPLong cpLongValue(final int index) {
    167        final Long l = Long.valueOf(cpLong[index]);
    168        CPLong cpLong = longsToCPLongs.get(l);
    169        if (cpLong == null) {
    170            cpLong = new CPLong(l, index + longOffset);
    171            longsToCPLongs.put(l, cpLong);
    172        }
    173        return cpLong;
    174    }
    175
    176    public CPMethodRef cpMethodValue(final int index) {
    177        return new CPMethodRef(cpClassValue(cpMethodClassInts[index]),
    178            cpNameAndTypeValue(cpMethodDescriptorInts[index]), index + methodOffset);
    179    }
    180
    181    public CPNameAndType cpNameAndTypeValue(final int index) {
    182        final String descriptor = cpDescriptor[index];
    183        CPNameAndType cpNameAndType = descriptorsToCPNameAndTypes.get(descriptor);
    184        if (cpNameAndType == null) {
    185            final int nameIndex = cpDescriptorNameInts[index];
    186            final int descriptorIndex = cpDescriptorTypeInts[index];
    187
    188            final CPUTF8 name = cpUTF8Value(nameIndex);
    189            final CPUTF8 descriptorU = cpSignatureValue(descriptorIndex);
    190            cpNameAndType = new CPNameAndType(name, descriptorU, index + descrOffset);
    191            descriptorsToCPNameAndTypes.put(descriptor, cpNameAndType);
    192        }
    193        return cpNameAndType;
    194    }
    195
    196    public CPNameAndType cpNameAndTypeValue(final String descriptor) {
    197        CPNameAndType cpNameAndType = descriptorsToCPNameAndTypes.get(descriptor);
    198        if (cpNameAndType == null) {
    199            final Integer index = mapDescriptor.get(descriptor);
    200            if (index != null) {
    201                return cpNameAndTypeValue(index.intValue());
    202            }
    203            final int colon = descriptor.indexOf(':');
    204            final String nameString = descriptor.substring(0, colon);
    205            final String descriptorString = descriptor.substring(colon + 1);
    206
    207            final CPUTF8 name = cpUTF8Value(nameString, true);
    208            final CPUTF8 descriptorU = cpUTF8Value(descriptorString, true);
    209            cpNameAndType = new CPNameAndType(name, descriptorU, -1 + descrOffset);
    210            descriptorsToCPNameAndTypes.put(descriptor, cpNameAndType);
    211        }
    212        return cpNameAndType;
    213    }
    214
    215    public CPUTF8 cpSignatureValue(final int index) {
    216        int globalIndex;
    217        if (cpSignatureInts[index] != -1) {
    218            globalIndex = cpSignatureInts[index];
    219        } else {
    220            globalIndex = index + signatureOffset;
    221        }
    222        final String string = cpSignature[index];
    223        CPUTF8 cpUTF8 = stringsToCPUTF8.get(string);
    224        if (cpUTF8 == null) {
    225            cpUTF8 = new CPUTF8(string, globalIndex);
    226            stringsToCPUTF8.put(string, cpUTF8);
    227        }
    228        return cpUTF8;
    229    }
    230
    231    public CPString cpStringValue(final int index) {
    232        final String string = cpString[index];
    233        final int utf8Index = cpStringInts[index];
    234        final int globalIndex = stringOffset + index;
    235        CPString cpString = stringsToCPStrings.get(string);
    236        if (cpString == null) {
    237            cpString = new CPString(cpUTF8Value(utf8Index), globalIndex);
    238            stringsToCPStrings.put(string, cpString);
    239        }
    240        return cpString;
    241    }
    242
    243    public CPUTF8 cpUTF8Value(final int index) {
    244        final String string = cpUTF8[index];
    245        CPUTF8 cputf8 = stringsToCPUTF8.get(string);
    246        if (cputf8 == null) {
    247            cputf8 = new CPUTF8(string, index);
    248            stringsToCPUTF8.put(string, cputf8);
    249        } else if (cputf8.getGlobalIndex() > index) {
    250            cputf8.setGlobalIndex(index);
    251        }
    252        return cputf8;
    253    }
    254
    255    public CPUTF8 cpUTF8Value(final String string) {
    256        return cpUTF8Value(string, true);
    257    }
    258
    259    public CPUTF8 cpUTF8Value(final String string, final boolean searchForIndex) {
    260        CPUTF8 cputf8 = stringsToCPUTF8.get(string);
    261        if (cputf8 == null) {
    262            Integer index = null;
    263            if (searchForIndex) {
    264                index = mapUTF8.get(string);
    265            }
    266            if (index != null) {
    267                return cpUTF8Value(index.intValue());
    268            }
    269            if (searchForIndex) {
    270                index = mapSignature.get(string);
    271            }
    272            if (index != null) {
    273                return cpSignatureValue(index.intValue());
    274            }
    275            cputf8 = new CPUTF8(string, -1);
    276            stringsToCPUTF8.put(string, cputf8);
    277        }
    278        return cputf8;
    279    }
    280
    281    public SegmentConstantPool getConstantPool() {
    282        return pool;
    283    }
    284
    285    public String[] getCpClass() {
    286        return cpClass;
    287    }
    288
    289    public String[] getCpDescriptor() {
    290        return cpDescriptor;
    291    }
    292
    293    public int[] getCpDescriptorNameInts() {
    294        return cpDescriptorNameInts;
    295    }
    296
    297    public int[] getCpDescriptorTypeInts() {
    298        return cpDescriptorTypeInts;
    299    }
    300
    301    public String[] getCpFieldClass() {
    302        return cpFieldClass;
    303    }
    304
    305    public String[] getCpIMethodClass() {
    306        return cpIMethodClass;
    307    }
    308
    309    public int[] getCpInt() {
    310        return cpInt;
    311    }
    312
    313    public long[] getCpLong() {
    314        return cpLong;
    315    }
    316
    317    public String[] getCpMethodClass() {
    318        return cpMethodClass;
    319    }
    320
    321    public String[] getCpMethodDescriptor() {
    322        return cpMethodDescriptor;
    323    }
    324
    325    public String[] getCpSignature() {
    326        return cpSignature;
    327    }
    328
    329    public String[] getCpUTF8() {
    330        return cpUTF8;
    331    }
    332
    333    /**
    334     * Parses the constant pool class names, using {@link #cpClassCount} to populate {@link #cpClass} from
    335     * {@link #cpUTF8}.
    336     *
    337     * @param in the input stream to read from
    338     * @throws IOException if a problem occurs during reading from the underlying stream
    339     * @throws Pack200Exception if a problem occurs with an unexpected value or unsupported codec
    340     */
    341    private void parseCpClass(final InputStream in) throws IOException, Pack200Exception {
    342        final int cpClassCount = header.getCpClassCount();
    343        cpClassInts = decodeBandInt("cp_Class", in, Codec.UDELTA5, cpClassCount);
    344        cpClass = new String[cpClassCount];
    345        mapClass = new HashMap<>(cpClassCount);
    346        for (int i = 0; i < cpClassCount; i++) {
    347            cpClass[i] = cpUTF8[cpClassInts[i]];
    348            mapClass.put(cpClass[i], Integer.valueOf(i));
    349        }
    350    }
    351
    352    /**
    353     * Parses the constant pool descriptor definitions, using {@link #cpDescriptorCount} to populate
    354     * {@link #cpDescriptor}. For ease of use, the cpDescriptor is stored as a string of the form <i>name:type</i>,
    355     * largely to make it easier for representing field and method descriptors (e.g.
    356     * {@code out:java.lang.PrintStream}) in a way that is compatible with passing String arrays.
    357     *
    358     * @param in the input stream to read from
    359     * @throws IOException if a problem occurs during reading from the underlying stream
    360     * @throws Pack200Exception if a problem occurs with an unexpected value or unsupported codec
    361     */
    362    private void parseCpDescriptor(final InputStream in) throws IOException, Pack200Exception {
    363        final int cpDescriptorCount = header.getCpDescriptorCount();
    364        cpDescriptorNameInts = decodeBandInt("cp_Descr_name", in, Codec.DELTA5, cpDescriptorCount);
    365        cpDescriptorTypeInts = decodeBandInt("cp_Descr_type", in, Codec.UDELTA5, cpDescriptorCount);
    366        final String[] cpDescriptorNames = getReferences(cpDescriptorNameInts, cpUTF8);
    367        final String[] cpDescriptorTypes = getReferences(cpDescriptorTypeInts, cpSignature);
    368        cpDescriptor = new String[cpDescriptorCount];
    369        mapDescriptor = new HashMap<>(cpDescriptorCount);
    370        for (int i = 0; i < cpDescriptorCount; i++) {
    371            cpDescriptor[i] = cpDescriptorNames[i] + ":" + cpDescriptorTypes[i]; //$NON-NLS-1$
    372            mapDescriptor.put(cpDescriptor[i], Integer.valueOf(i));
    373        }
    374    }
    375
    376    private void parseCpDouble(final InputStream in) throws IOException, Pack200Exception {
    377        final int cpDoubleCount = header.getCpDoubleCount();
    378        final long[] band = parseFlags("cp_Double", in, cpDoubleCount, Codec.UDELTA5, Codec.DELTA5);
    379        cpDouble = new double[band.length];
    380        Arrays.setAll(cpDouble, i -> Double.longBitsToDouble(band[i]));
    381    }
    382
    383    /**
    384     * Parses the constant pool field definitions, using {@link #cpFieldCount} to populate {@link #cpFieldClass} and
    385     * {@link #cpFieldDescriptor}.
    386     *
    387     * @param in the input stream to read from
    388     * @throws IOException if a problem occurs during reading from the underlying stream
    389     * @throws Pack200Exception if a problem occurs with an unexpected value or unsupported codec
    390     */
    391    private void parseCpField(final InputStream in) throws IOException, Pack200Exception {
    392        final int cpFieldCount = header.getCpFieldCount();
    393        cpFieldClassInts = decodeBandInt("cp_Field_class", in, Codec.DELTA5, cpFieldCount);
    394        cpFieldDescriptorInts = decodeBandInt("cp_Field_desc", in, Codec.UDELTA5, cpFieldCount);
    395        cpFieldClass = new String[cpFieldCount];
    396        cpFieldDescriptor = new String[cpFieldCount];
    397        for (int i = 0; i < cpFieldCount; i++) {
    398            cpFieldClass[i] = cpClass[cpFieldClassInts[i]];
    399            cpFieldDescriptor[i] = cpDescriptor[cpFieldDescriptorInts[i]];
    400        }
    401    }
    402
    403    private void parseCpFloat(final InputStream in) throws IOException, Pack200Exception {
    404        final int cpFloatCount = header.getCpFloatCount();
    405        cpFloat = new float[cpFloatCount];
    406        final int[] floatBits = decodeBandInt("cp_Float", in, Codec.UDELTA5, cpFloatCount);
    407        for (int i = 0; i < cpFloatCount; i++) {
    408            cpFloat[i] = Float.intBitsToFloat(floatBits[i]);
    409        }
    410    }
    411
    412    /**
    413     * Parses the constant pool interface method definitions, using {@link #cpIMethodCount} to populate
    414     * {@link #cpIMethodClass} and {@link #cpIMethodDescriptor}.
    415     *
    416     * @param in the input stream to read from
    417     * @throws IOException if a problem occurs during reading from the underlying stream
    418     * @throws Pack200Exception if a problem occurs with an unexpected value or unsupported codec
    419     */
    420    private void parseCpIMethod(final InputStream in) throws IOException, Pack200Exception {
    421        final int cpIMethodCount = header.getCpIMethodCount();
    422        cpIMethodClassInts = decodeBandInt("cp_Imethod_class", in, Codec.DELTA5, cpIMethodCount);
    423        cpIMethodDescriptorInts = decodeBandInt("cp_Imethod_desc", in, Codec.UDELTA5, cpIMethodCount);
    424        cpIMethodClass = new String[cpIMethodCount];
    425        cpIMethodDescriptor = new String[cpIMethodCount];
    426        for (int i = 0; i < cpIMethodCount; i++) {
    427            cpIMethodClass[i] = cpClass[cpIMethodClassInts[i]];
    428            cpIMethodDescriptor[i] = cpDescriptor[cpIMethodDescriptorInts[i]];
    429        }
    430    }
    431
    432    private void parseCpInt(final InputStream in) throws IOException, Pack200Exception {
    433        final int cpIntCount = header.getCpIntCount();
    434        cpInt = decodeBandInt("cpInt", in, Codec.UDELTA5, cpIntCount);
    435    }
    436
    437    private void parseCpLong(final InputStream in) throws IOException, Pack200Exception {
    438        final int cpLongCount = header.getCpLongCount();
    439        cpLong = parseFlags("cp_Long", in, cpLongCount, Codec.UDELTA5, Codec.DELTA5);
    440    }
    441
    442    /**
    443     * Parses the constant pool method definitions, using {@link #cpMethodCount} to populate {@link #cpMethodClass} and
    444     * {@link #cpMethodDescriptor}.
    445     *
    446     * @param in the input stream to read from
    447     * @throws IOException if a problem occurs during reading from the underlying stream
    448     * @throws Pack200Exception if a problem occurs with an unexpected value or unsupported codec
    449     */
    450    private void parseCpMethod(final InputStream in) throws IOException, Pack200Exception {
    451        final int cpMethodCount = header.getCpMethodCount();
    452        cpMethodClassInts = decodeBandInt("cp_Method_class", in, Codec.DELTA5, cpMethodCount);
    453        cpMethodDescriptorInts = decodeBandInt("cp_Method_desc", in, Codec.UDELTA5, cpMethodCount);
    454        cpMethodClass = new String[cpMethodCount];
    455        cpMethodDescriptor = new String[cpMethodCount];
    456        for (int i = 0; i < cpMethodCount; i++) {
    457            cpMethodClass[i] = cpClass[cpMethodClassInts[i]];
    458            cpMethodDescriptor[i] = cpDescriptor[cpMethodDescriptorInts[i]];
    459        }
    460    }
    461
    462    /**
    463     * Parses the constant pool signature classes, using {@link #cpSignatureCount} to populate {@link #cpSignature}. A
    464     * signature form is akin to the bytecode representation of a class; Z for boolean, I for int, [ for array etc.
    465     * However, although classes are started with L, the class name does not follow the form; instead, there is a
    466     * separate array of classes. So an array corresponding to {@code public static void main(String args[])} has a
    467     * form of {@code [L(V)} and a classes array of {@code [java.lang.String]}. The {@link #cpSignature} is a
    468     * string representation identical to the bytecode equivalent {@code [Ljava/lang/String;(V)} TODO Check that
    469     * the form is as above and update other types e.g. J
    470     *
    471     * @param in the input stream to read from
    472     * @throws IOException if a problem occurs during reading from the underlying stream
    473     * @throws Pack200Exception if a problem occurs with an unexpected value or unsupported codec
    474     */
    475    private void parseCpSignature(final InputStream in) throws IOException, Pack200Exception {
    476        final int cpSignatureCount = header.getCpSignatureCount();
    477        cpSignatureInts = decodeBandInt("cp_Signature_form", in, Codec.DELTA5, cpSignatureCount);
    478        final String[] cpSignatureForm = getReferences(cpSignatureInts, cpUTF8);
    479        cpSignature = new String[cpSignatureCount];
    480        mapSignature = new HashMap<>();
    481        int lCount = 0;
    482        for (int i = 0; i < cpSignatureCount; i++) {
    483            final String form = cpSignatureForm[i];
    484            final char[] chars = form.toCharArray();
    485            for (final char element : chars) {
    486                if (element == 'L') {
    487                    cpSignatureInts[i] = -1;
    488                    lCount++;
    489                }
    490            }
    491        }
    492        final String[] cpSignatureClasses = parseReferences("cp_Signature_classes", in, Codec.UDELTA5, lCount, cpClass);
    493        int index = 0;
    494        for (int i = 0; i < cpSignatureCount; i++) {
    495            final String form = cpSignatureForm[i];
    496            final int len = form.length();
    497            final StringBuilder signature = new StringBuilder(64);
    498            final ArrayList<String> list = new ArrayList<>();
    499            for (int j = 0; j < len; j++) {
    500                final char c = form.charAt(j);
    501                signature.append(c);
    502                if (c == 'L') {
    503                    final String className = cpSignatureClasses[index];
    504                    list.add(className);
    505                    signature.append(className);
    506                    index++;
    507                }
    508            }
    509            cpSignature[i] = signature.toString();
    510            mapSignature.put(signature.toString(), Integer.valueOf(i));
    511        }
    512//        for (int i = 0; i < cpSignatureInts.length; i++) {
    513//            if (cpSignatureInts[i] == -1) {
    514//                cpSignatureInts[i] = search(cpUTF8, cpSignature[i]);
    515//            }
    516//        }
    517    }
    518
    519    /**
    520     * Parses the constant pool strings, using {@link #cpStringCount} to populate {@link #cpString} from indexes into
    521     * {@link #cpUTF8}.
    522     *
    523     * @param in the input stream to read from
    524     * @throws IOException if a problem occurs during reading from the underlying stream
    525     * @throws Pack200Exception if a problem occurs with an unexpected value or unsupported codec
    526     */
    527    private void parseCpString(final InputStream in) throws IOException, Pack200Exception {
    528        final int cpStringCount = header.getCpStringCount();
    529        cpStringInts = decodeBandInt("cp_String", in, Codec.UDELTA5, cpStringCount);
    530        cpString = new String[cpStringCount];
    531        Arrays.setAll(cpString, i -> cpUTF8[cpStringInts[i]]);
    532    }
    533
    534    private void parseCpUtf8(final InputStream in) throws IOException, Pack200Exception {
    535        final int cpUTF8Count = header.getCpUTF8Count();
    536        cpUTF8 = new String[cpUTF8Count];
    537        mapUTF8 = new HashMap<>(cpUTF8Count + 1);
    538        cpUTF8[0] = ""; //$NON-NLS-1$
    539        mapUTF8.put("", Integer.valueOf(0));
    540        final int[] prefix = decodeBandInt("cpUTF8Prefix", in, Codec.DELTA5, cpUTF8Count - 2);
    541        int charCount = 0;
    542        int bigSuffixCount = 0;
    543        final int[] suffix = decodeBandInt("cpUTF8Suffix", in, Codec.UNSIGNED5, cpUTF8Count - 1);
    544
    545        for (final int element : suffix) {
    546            if (element == 0) {
    547                bigSuffixCount++;
    548            } else {
    549                charCount += element;
    550            }
    551        }
    552        final char[] data = new char[charCount];
    553        final int[] dataBand = decodeBandInt("cp_Utf8_chars", in, Codec.CHAR3, charCount);
    554        for (int i = 0; i < data.length; i++) {
    555            data[i] = (char) dataBand[i];
    556        }
    557
    558        // Read in the big suffix data
    559        final int[] bigSuffixCounts = decodeBandInt("cp_Utf8_big_suffix", in, Codec.DELTA5, bigSuffixCount);
    560        final int[][] bigSuffixDataBand = new int[bigSuffixCount][];
    561        for (int i = 0; i < bigSuffixDataBand.length; i++) {
    562            bigSuffixDataBand[i] = decodeBandInt("cp_Utf8_big_chars " + i, in, Codec.DELTA5, bigSuffixCounts[i]);
    563        }
    564
    565        // Convert big suffix data to characters
    566        final char[][] bigSuffixData = new char[bigSuffixCount][];
    567        for (int i = 0; i < bigSuffixDataBand.length; i++) {
    568            bigSuffixData[i] = new char[bigSuffixDataBand[i].length];
    569            for (int j = 0; j < bigSuffixDataBand[i].length; j++) {
    570                bigSuffixData[i][j] = (char) bigSuffixDataBand[i][j];
    571            }
    572        }
    573        // Go through the strings
    574        charCount = 0;
    575        bigSuffixCount = 0;
    576        for (int i = 1; i < cpUTF8Count; i++) {
    577            final String lastString = cpUTF8[i - 1];
    578            if (suffix[i - 1] == 0) {
    579                // The big suffix stuff hasn't been tested, and I'll be
    580                // surprised if it works first time w/o errors ...
    581                cpUTF8[i] = lastString.substring(0, i > 1 ? prefix[i - 2] : 0)
    582                    + new String(bigSuffixData[bigSuffixCount++]);
    583                mapUTF8.put(cpUTF8[i], Integer.valueOf(i));
    584            } else {
    585                cpUTF8[i] = lastString.substring(0, i > 1 ? prefix[i - 2] : 0)
    586                    + new String(data, charCount, suffix[i - 1]);
    587                charCount += suffix[i - 1];
    588                mapUTF8.put(cpUTF8[i], Integer.valueOf(i));
    589            }
    590        }
    591    }
    592
    593    @Override
    594    public void read(final InputStream in) throws IOException, Pack200Exception {
    595        parseCpUtf8(in);
    596        parseCpInt(in);
    597        parseCpFloat(in);
    598        parseCpLong(in);
    599        parseCpDouble(in);
    600        parseCpString(in);
    601        parseCpClass(in);
    602        parseCpSignature(in);
    603        parseCpDescriptor(in);
    604        parseCpField(in);
    605        parseCpMethod(in);
    606        parseCpIMethod(in);
    607
    608        intOffset = cpUTF8.length;
    609        floatOffset = intOffset + cpInt.length;
    610        longOffset = floatOffset + cpFloat.length;
    611        doubleOffset = longOffset + cpLong.length;
    612        stringOffset = doubleOffset + cpDouble.length;
    613        classOffset = stringOffset + cpString.length;
    614        signatureOffset = classOffset + cpClass.length;
    615        descrOffset = signatureOffset + cpSignature.length;
    616        fieldOffset = descrOffset + cpDescriptor.length;
    617        methodOffset = fieldOffset + cpFieldClass.length;
    618        imethodOffset = methodOffset + cpMethodClass.length;
    619    }
    620
    621    @Override
    622    public void unpack() {
    623
    624    }
    625
    626}