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