304 lines
9.1 KiB
Java
304 lines
9.1 KiB
Java
import java.io.*;
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class InstallSDE {
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static final boolean verbose = true;
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static final String nameSDE = "SourceDebugExtension";
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byte[] orig;
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byte[] sdeAttr;
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byte[] gen;
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int origPos = 0;
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int genPos = 0;
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int sdeIndex;
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public static void main(String[] args) throws IOException {
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if (args.length == 2) {
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install(new File(args[0]), new File(args[1]));
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} else if (args.length == 3) {
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install(new File(args[0]), new File(args[1]), new File(args[2]));
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} else {
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abort("Usage: <command> <input class file> " +
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"<attribute file> <output class file name>\n" +
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"<command> <input/output class file> <attribute file>");
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}
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}
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static void install(File inClassFile, File attrFile, File outClassFile)
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throws IOException {
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new InstallSDE(inClassFile, attrFile, outClassFile);
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}
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static void install(File inOutClassFile, File attrFile) throws IOException {
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File tmpFile = new File(inOutClassFile.getPath() + "tmp-out");
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File tmpInOutClassFile = new File(inOutClassFile.getPath() + "tmp-in");
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// Workaround delayed file deletes on Windows using a tmp file name
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if (!inOutClassFile.renameTo(tmpInOutClassFile)) {
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throw new IOException("tmp copy of inOutClassFile failed");
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}
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new InstallSDE(tmpInOutClassFile, attrFile, tmpFile);
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if (!tmpInOutClassFile.delete()) {
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throw new IOException("tmpInOutClassFile.delete() failed");
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}
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if (!tmpFile.renameTo(inOutClassFile)) {
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throw new IOException("tmpFile.renameTo(inOutClassFile) failed");
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}
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}
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static void abort(String msg) {
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System.err.println(msg);
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System.exit(1);
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}
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InstallSDE(File inClassFile, File attrFile, File outClassFile) throws IOException {
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if (!inClassFile.exists()) {
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abort("no such file: " + inClassFile);
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}
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if (!attrFile.exists()) {
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abort("no such file: " + attrFile);
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}
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// get the bytes
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orig = readWhole(inClassFile);
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sdeAttr = readWhole(attrFile);
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gen = new byte[orig.length + sdeAttr.length + 100];
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// do it
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addSDE();
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// write result
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FileOutputStream outStream = new FileOutputStream(outClassFile);
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outStream.write(gen, 0, genPos);
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outStream.close();
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}
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byte[] readWhole(File input) throws IOException {
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FileInputStream inStream = new FileInputStream(input);
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int len = (int)input.length();
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byte[] bytes = new byte[len];
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if (inStream.read(bytes, 0, len) != len) {
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abort("expected size: " + len);
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}
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inStream.close();
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return bytes;
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}
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void addSDE() throws UnsupportedEncodingException {
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int i;
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copy(4 + 2 + 2); // magic min/maj version
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int constantPoolCountPos = genPos;
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int constantPoolCount = readU2();
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writeU2(constantPoolCount);
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// copy old constant pool return index of SDE symbol, if found
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sdeIndex = copyConstantPool(constantPoolCount);
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if (sdeIndex < 0) {
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// if "SourceDebugExtension" symbol not there add it
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writeUtf8ForSDE();
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// increment the countantPoolCount
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sdeIndex = constantPoolCount;
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++constantPoolCount;
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randomAccessWriteU2(constantPoolCountPos, constantPoolCount);
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if (verbose) {
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System.out.println("SourceDebugExtension not found, installed at: " +
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sdeIndex);
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}
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} else {
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if (verbose) {
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System.out.println("SourceDebugExtension found at: " +
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sdeIndex);
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}
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}
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copy(2 + 2 + 2); // access, this, super
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int interfaceCount = readU2();
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writeU2(interfaceCount);
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if (verbose) {
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System.out.println("interfaceCount: " + interfaceCount);
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}
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copy(interfaceCount * 2);
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copyMembers(); // fields
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copyMembers(); // methods
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int attrCountPos = genPos;
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int attrCount = readU2();
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writeU2(attrCount);
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if (verbose) {
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System.out.println("class attrCount: " + attrCount);
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}
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// copy the class attributes, return true if SDE attr found (not copied)
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if (!copyAttrs(attrCount)) {
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// we will be adding SDE and it isn't already counted
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++attrCount;
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randomAccessWriteU2(attrCountPos, attrCount);
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if (verbose) {
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System.out.println("class attrCount incremented");
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}
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}
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writeAttrForSDE(sdeIndex);
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}
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void copyMembers() {
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int count = readU2();
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writeU2(count);
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if (verbose) {
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System.out.println("members count: " + count);
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}
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for (int i = 0; i < count; ++i) {
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copy(6); // access, name, descriptor
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int attrCount = readU2();
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writeU2(attrCount);
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if (verbose) {
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System.out.println("member attr count: " + attrCount);
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}
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copyAttrs(attrCount);
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}
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}
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boolean copyAttrs(int attrCount) {
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boolean sdeFound = false;
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for (int i = 0; i < attrCount; ++i) {
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int nameIndex = readU2();
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// don't write old SDE
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if (nameIndex == sdeIndex) {
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sdeFound = true;
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if (verbose) {
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System.out.println("SDE attr found");
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}
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} else {
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writeU2(nameIndex); // name
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int len = readU4();
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writeU4(len);
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copy(len);
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if (verbose) {
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System.out.println("attr len: " + len);
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}
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}
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}
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return sdeFound;
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}
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void writeAttrForSDE(int index) {
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writeU2(index);
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writeU4(sdeAttr.length);
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for (int i = 0; i < sdeAttr.length; ++i) {
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writeU1(sdeAttr[i]);
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}
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}
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void randomAccessWriteU2(int pos, int val) {
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int savePos = genPos;
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genPos = pos;
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writeU2(val);
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genPos = savePos;
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}
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int readU1() {
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return ((int)orig[origPos++]) & 0xFF;
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}
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int readU2() {
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int res = readU1();
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return (res << 8) + readU1();
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}
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int readU4() {
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int res = readU2();
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return (res << 16) + readU2();
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}
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void writeU1(int val) {
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gen[genPos++] = (byte)val;
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}
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void writeU2(int val) {
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writeU1(val >> 8);
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writeU1(val & 0xFF);
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}
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void writeU4(int val) {
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writeU2(val >> 16);
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writeU2(val & 0xFFFF);
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}
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void copy(int count) {
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for (int i = 0; i < count; ++i) {
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gen[genPos++] = orig[origPos++];
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}
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}
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byte[] readBytes(int count) {
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byte[] bytes = new byte[count];
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for (int i = 0; i < count; ++i) {
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bytes[i] = orig[origPos++];
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}
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return bytes;
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}
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void writeBytes(byte[] bytes) {
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for (int i = 0; i < bytes.length; ++i) {
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gen[genPos++] = bytes[i];
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}
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}
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int copyConstantPool(int constantPoolCount) throws UnsupportedEncodingException {
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int sdeIndex = -1;
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// copy const pool index zero not in class file
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for (int i = 1; i < constantPoolCount; ++i) {
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int tag = readU1();
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writeU1(tag);
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switch (tag) {
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case 7: // Class
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case 8: // String
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copy(2);
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break;
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case 9: // Field
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case 10: // Method
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case 11: // InterfaceMethod
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case 3: // Integer
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case 4: // Float
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case 12: // NameAndType
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case 18: // InvokeDynamic
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copy(4);
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break;
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case 5: // Long
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case 6: // Double
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copy(8);
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break;
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case 15: // MethodHandle
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copy(3);
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break;
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case 1: // Utf8
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int len = readU2();
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writeU2(len);
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byte[] utf8 = readBytes(len);
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String str = new String(utf8, "UTF-8");
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if (verbose) {
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System.out.println(i + " read class attr -- '" + str + "'");
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}
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if (str.equals(nameSDE)) {
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sdeIndex = i;
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}
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writeBytes(utf8);
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break;
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default:
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abort("unexpected tag: " + tag);
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break;
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}
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}
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return sdeIndex;
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}
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void writeUtf8ForSDE() {
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int len = nameSDE.length();
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writeU1(1); // Utf8 tag
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writeU2(len);
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for (int i = 0; i < len; ++i) {
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writeU1(nameSDE.charAt(i));
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}
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}
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}
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