| 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)); |
| } |
| } |
| } |