bytecode-viewer/plugins/java/ClassParser.java at master · GitJavaProgramming/bytecode-viewer · GitHub

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import org.objectweb.asm.ClassWriter;

import org.objectweb.asm.tree.ClassNode;

import the.bytecode.club.bytecodeviewer.BytecodeViewer;

import the.bytecode.club.bytecodeviewer.api.Plugin;

import the.bytecode.club.bytecodeviewer.api.PluginConsole;

import the.bytecode.club.bytecodeviewer.translation.TranslatedStrings;

import java.io.ByteArrayInputStream;

import java.io.DataInputStream;

import java.io.IOException;

import java.nio.BufferUnderflowException;

import java.nio.ByteBuffer;

import java.security.MessageDigest;

import java.security.NoSuchAlgorithmException;

import java.util.ArrayList;

import java.util.Date;

import java.util.List;

/**

* Class Parser

* @author Damir37

public class ClassParser extends Plugin

{

private PluginConsole pluginConsole;

@Override

public void execute(List<ClassNode> list)

{

if(!BytecodeViewer.isActiveClassActive())

{

BytecodeViewer.showMessage("Open A Classfile First");

return;

}

ClassNode c = BytecodeViewer.getCurrentlyOpenedClassNode();

ClassFileParser classFileParser = new ClassFileParser(classNodeToByte(c));

pluginConsole = new PluginConsole("ClassParser");

pluginConsole.setVisible(true);

print("Parsing class: " + c.name + ".class");

print("MAGIC VALUE: " + classFileParser.parseMagicValue());

print("Class version: " + classFileParser.parseVersionClass());

print("Constant pool count: " + classFileParser.parseConstantPoolCount()

+ " If not all constants were parsed, most likely the constant is not used in the bytecode.");

print("Then use the javap utility to view the constant pool of a class file.");

print("Last modified class: " + classFileParser.parseClassModificationDate());

print("Hash sum class md5: " + classFileParser.getHash("MD5"));

print("Hash sum class sha1: " + classFileParser.getHash("SHA-1"));

print("Hash sum class sha256: " + classFileParser.getHash("SHA-256"));

print("Hash sum class sha512: " + classFileParser.getHash("SHA-512"));

print("Constant pool ->");

classFileParser.getConstantPool().parseConstantPool();

if (classFileParser.getConstantPool().getCpList() != null && !classFileParser.getConstantPool().getCpList().isEmpty())

{

for (String s : classFileParser.getConstantPool().getCpList())

{

print(s);

}

private byte[] classNodeToByte(ClassNode classNode)

{

ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_FRAMES);

classNode.accept(cw);

return cw.toByteArray();

}

public void print(String text)

{

pluginConsole.appendText(text);

pluginConsole.repaint();

}

private static class ClassFileParser

{

private final ByteBuffer buffer;

private final ConstantParser cpParser;

public ClassFileParser(byte[] classBytes)

{

this.buffer = ByteBuffer.wrap(classBytes);

cpParser = new ConstantParser(buffer, parseConstantPoolCount());

}

public String parseMagicValue()

{

buffer.position(0);

int magicValue = buffer.getInt();

return "0x" + Integer.toHexString(magicValue).toUpperCase();

}

public ClassVersion parseVersionClass()

{

buffer.position(4);

int minor = buffer.getShort() & 0xFFFF;

int major = buffer.getShort() & 0xFFFF;

return ClassVersion.check(major, minor);

}

public Date parseClassModificationDate()

{

buffer.position(8);

long modificationTime = buffer.getInt() & 0xFFFFFFFFL;

return new Date(modificationTime * 1000L);

}

public int parseConstantPoolCount()

{

buffer.position(8);

return buffer.getShort() & 0xFFFF;

}

public String getHash(String algorithm)

{

try

{

MessageDigest md = MessageDigest.getInstance(algorithm);

md.update(buffer.array());

byte[] digest = md.digest();

return convertToHex(digest);

}

catch (NoSuchAlgorithmException e)

{

e.printStackTrace();

}

return "null";

}

private String convertToHex(byte[] bytes)

{

StringBuilder hexString = new StringBuilder();

for (byte b : bytes)

{

hexString.append(String.format("%02X", b));

}

return hexString.toString();

}

public ConstantParser getConstantPool()

{

return cpParser;

}

private enum ClassVersion

{

UNKNOWN(0, 0),

JAVA_1_1(45, 3),

JAVA_1_2(46, 0),

JAVA_1_3(47, 0),

JAVA_1_4(48, 0),

JAVA_5(49, 0),

JAVA_6(50, 0),

JAVA_7(51, 0),

JAVA_8(52, 0),

JAVA_9(53, 0),

JAVA_10(54, 0),

AVA_11(55, 0),

JAVA_12(56, 0),

JAVA_13(57, 0),

JAVA_14(58, 0),

JAVA_15(59, 0),

JAVA_16(60, 0),

JAVA_17(61, 0),

JAVA_18(62, 0),

JAVA_19(63, 0),

JAVA_20(64, 0),

JAVA_21(65, 0),

JAVA_22(66, 0),

JAVA_23(67, 0),

JAVA_24(68, 0),

JAVA_25(69, 0),

JAVA_26(70, 0),

JAVA_27(71, 0),

JAVA_28(72, 0),

JAVA_29(73, 0),

JAVA_30(74, 0);

public final int major;

public final int minor;

ClassVersion(int major, int minor)

{

this.major = major;

this.minor = minor;

}

public static ClassVersion check(int major, int minor)

{

for (ClassVersion v : ClassVersion.values())

{

if (v.major == major && v.minor == minor)

return v;

}

return UNKNOWN;

}

private static class ConstantParser

{

private final ByteBuffer buffer;

private final int constantPoolCount;

private final List<String> cpList = new ArrayList<String>();

public ConstantParser(ByteBuffer buffer, int constantPoolCount)

{

this.buffer = buffer;

this.constantPoolCount = constantPoolCount;

}

public void parseConstantPool()

{

buffer.position(10);

for (int i = 1; i < constantPoolCount; i++)

{

int tag = buffer.get() & 0xFF;

switch (tag)

{

case ConstantType.CONSTANT_Utf8:

int length = buffer.getShort() & 0xFFFF;

byte[] bytes = new byte[length];

buffer.get(bytes);

String string = new String(bytes);

cpList.add("[" + i + "] CONSTANT_Utf8: " + string);

break;

case ConstantType.CONSTANT_Integer:

int value = buffer.getInt();

cpList.add("[" + i + "] CONSTANT_Integer: " + value);

break;

case ConstantType.CONSTANT_Float:

float floatValue = buffer.getFloat();

cpList.add("[" + i + "] CONSTANT_Float: " + floatValue);

break;

case ConstantType.CONSTANT_Long:

long longValue = buffer.getLong();

cpList.add("[" + i + "] CONSTANT_Long: " + longValue);

i++;

break;

case ConstantType.CONSTANT_Double:

double doubleValue = buffer.getDouble();

cpList.add("[" + i + "] CONSTANT_Double: " + doubleValue);

i++;

break;

case ConstantType.CONSTANT_Class:

int nameIndex = buffer.getShort() & 0xFFFF;

cpList.add("[" + i + "] CONSTANT_Class: #" + nameIndex);

break;

case ConstantType.CONSTANT_String:

int stringIndex = buffer.getShort() & 0xFFFF;

cpList.add("[" + i + "] CONSTANT_String: #" + stringIndex);

break;

case ConstantType.CONSTANT_Fieldref:

case ConstantType.CONSTANT_Methodref:

case ConstantType.CONSTANT_InterfaceMethodref:

int classIndex = buffer.getShort() & 0xFFFF;

int nameAndTypeIndex = buffer.getShort() & 0xFFFF;

cpList.add("[" + i + "] CONSTANT_" + getRefTypeName(tag) + ": #" + classIndex + ".#" + nameAndTypeIndex);

break;

case ConstantType.CONSTANT_NameAndType:

int nameIndex1 = buffer.getShort() & 0xFFFF;

int descriptorIndex = buffer.getShort() & 0xFFFF;

cpList.add("[" + i + "] CONSTANT_NameAndType: #" + nameIndex1 + ":#" + descriptorIndex);

break;

case ConstantType.CONSTANT_MethodHandle:

int referenceKind = buffer.get() & 0xFF;

int referenceIndex = buffer.getShort() & 0xFFFF;

cpList.add("[" + i + "] CONSTANT_MethodHandle: " + referenceKind + ":#" + referenceIndex);

break;

case ConstantType.CONSTANT_MethodType:

int descriptorIndex1 = buffer.getShort() & 0xFFFF;

cpList.add("[" + i + "] CONSTANT_MethodType: #" + descriptorIndex1);

break;

case ConstantType.CONSTANT_InvokeDynamic:

int bootstrapMethodAttrIndex = buffer.getShort() & 0xFFFF;

int nameAndTypeIndex3 = buffer.getShort() & 0xFFFF;

cpList.add("[" + i + "] CONSTANT_InvokeDynamic: #" + bootstrapMethodAttrIndex + ":#" + nameAndTypeIndex3);

break;

default:

throw new IllegalArgumentException("Unknown constant pool tag " + tag);

}

private String getRefTypeName(int tag)

{

switch (tag)

{

case ConstantType.CONSTANT_Fieldref:

return "Fieldref";

case ConstantType.CONSTANT_Methodref:

return "Methodref";

case ConstantType.CONSTANT_InterfaceMethodref:

return "InterfaceMethodref";

default:

return "Unknown";

}

public List<String> getCpList()

{

return cpList;

}

private interface ConstantType

{

public static final byte CONSTANT_Utf8 = 1;

public static final byte CONSTANT_Class = 7;

public static final byte CONSTANT_Fieldref = 9;

public static final byte CONSTANT_Methodref = 10;

public static final byte CONSTANT_InterfaceMethodref = 11;

public static final byte CONSTANT_String = 8;

public static final byte CONSTANT_Integer = 3;

public static final byte CONSTANT_Float = 4;

public static final byte CONSTANT_Long = 5;

public static final byte CONSTANT_Double = 6;

public static final byte CONSTANT_NameAndType = 12;

public static final byte CONSTANT_MethodHandle = 15;

public static final byte CONSTANT_MethodType = 16;

public static final byte CONSTANT_InvokeDynamic = 18;

}

bytecode-viewer/plugins/java/ClassParser.java at master · GitJavaProgramming/bytecode-viewer · GitHub

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