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thorough skipping

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git-svn-id: https://svn.code.sf.net/p/jode/code/trunk@346 379699f6-c40d-0410-875b-85095c16579e
stable
jochen 26 years ago
parent 4c7571734f
commit 168465364c
4 changed files with 88 additions and 45 deletions
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
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  1. 10
      jode/jode/bytecode/AttributeInfo.java
  2. 9
      jode/jode/bytecode/BinaryInfo.java
  3. 40
      jode/jode/decompiler/Opcodes.java
  4. 74
      jode/jode/obfuscator/MethodIdentifier.java

10
jode/jode/bytecode/AttributeInfo.java
Unescape View File

@ -38,8 +38,14 @@ public class AttributeInfo {
name = attrName;
data = new byte[length];
input.readFully(data);
} else
input.skip(length);
} else {
while (length > 0) {
int skipped = (int) input.skip(length);
if (skipped == 0)
throw new EOFException("Can't skip. EOF?");
length -= skipped;
}
}
}
public String getName() {

9
jode/jode/bytecode/BinaryInfo.java
Unescape View File

@ -51,8 +51,13 @@ public class BinaryInfo {
int count = input.readUnsignedShort();
for (int i=0; i< count; i++) {
input.readUnsignedShort(); // the name index
int length = input.readInt();
input.skip(length);
long length = input.readInt();
while (length > 0) {
long skipped = input.skip(length);
if (skipped == 0)
throw new EOFException("Can't skip. EOF?");
length -= skipped;
}
}
}

40
jode/jode/decompiler/Opcodes.java
Unescape View File

@ -113,6 +113,22 @@ public abstract class Opcodes implements jode.bytecode.Opcodes {
return new RetBlock(local);
}
/**
* Skips the specified number of bytes in the input stream. This calls
* skip as long until the bytes are all skipped.
* @param is the inputstream to skip.
* @param count the number of bytes to skip.
*/
private final static void skip(InputStream is, long count)
throws IOException {
while (count > 0) {
long skipped = is.skip(count);
if (skipped == 0)
throw new EOFException("Can't skip");
count -= skipped;
}
}
/**
* Read an opcode out of a data input stream and determine its size
* and its successors.
@ -127,10 +143,10 @@ public abstract class Opcodes implements jode.bytecode.Opcodes {
int opcode = stream.readUnsignedByte();
switch (opcode) {
case opc_multianewarray:
stream.skip(3);
skip(stream, 3);
return new int[] { 4, addr+4 };
case opc_invokeinterface:
stream.skip(4);
skip(stream, 4);
return new int[] { 5, addr+5 };
case opc_wide: {
@ -139,21 +155,21 @@ public abstract class Opcodes implements jode.bytecode.Opcodes {
case opc_fload: case opc_dload: case opc_aload:
case opc_istore: case opc_lstore:
case opc_fstore: case opc_dstore: case opc_astore:
stream.skip(2);
skip(stream, 2);
return new int[] { 4, addr+4 };
case opc_iinc:
stream.skip(4);
skip(stream, 4);
return new int[] { 6, addr+6 };
case opc_ret:
stream.skip(2);
skip(stream, 2);
return new int[] { 4 };
default:
throw new ClassFormatError("Invalid wide opcode "+opcode);
}
}
case opc_ret:
stream.skip(1);
skip(stream, 1);
return new int[] { 2 };
case opc_jsr_w:
@ -166,7 +182,7 @@ public abstract class Opcodes implements jode.bytecode.Opcodes {
case opc_tableswitch: {
int length = 3-(addr % 4);
stream.skip(length);
skip(stream, length);
int def = addr + stream.readInt();
int low = stream.readInt();
int high = stream.readInt();
@ -180,7 +196,7 @@ public abstract class Opcodes implements jode.bytecode.Opcodes {
}
case opc_lookupswitch: {
int length = 3-(addr % 4);
stream.skip(length);
skip(stream, length);
int def = addr + stream.readInt();
int npairs = stream.readInt();
int[] dests = new int[npairs+2];
@ -212,14 +228,14 @@ public abstract class Opcodes implements jode.bytecode.Opcodes {
case opc_anewarray:
case opc_checkcast:
case opc_instanceof:
stream.skip(2);
skip(stream, 2);
return new int[] { 3, addr+3 };
}
if (opcode == opc_newarray
|| (opcode >= opc_bipush && opcode <= opc_aload)
|| (opcode >= opc_istore && opcode <= opc_astore)) {
stream.skip(1);
skip(stream, 1);
return new int[] { 2, addr+2 };
}
@ -475,7 +491,7 @@ public abstract class Opcodes implements jode.bytecode.Opcodes {
ca.getLocalInfo(addr, stream.readUnsignedByte()));
case opc_tableswitch: {
int length = 3-(addr % 4);
stream.skip(length);
skip(stream, length);
int def = addr + stream.readInt();
int low = stream.readInt();
int high = stream.readInt();
@ -492,7 +508,7 @@ public abstract class Opcodes implements jode.bytecode.Opcodes {
}
case opc_lookupswitch: {
int length = 3-(addr % 4);
stream.skip(length);
skip(stream, length);
int def = addr + stream.readInt();
int npairs = stream.readInt();
int[] cases = new int[npairs];

74
jode/jode/obfuscator/MethodIdentifier.java
Unescape View File

@ -52,7 +52,7 @@ public class MethodIdentifier extends Identifier implements Opcodes {
if (exceptionsattr != null)
readExceptions(exceptionsattr);
} catch (IOException ex) {
ex.printStackTrace();
ex.printStackTrace(Obfuscator.err);
}
}
@ -63,6 +63,22 @@ public class MethodIdentifier extends Identifier implements Opcodes {
}
}
/**
* Skips the specified number of bytes in the input stream. This calls
* skip as long until the bytes are all skipped.
* @param is the inputstream to skip.
* @param count the number of bytes to skip.
*/
private final static void skip(InputStream is, long count)
throws IOException {
while (count > 0) {
long skipped = is.skip(count);
if (skipped == 0)
throw new EOFException("Can't skip.");
count -= skipped;
}
}
/**
* Reads the opcodes out of the code info and determine its
* references
@ -84,12 +100,12 @@ public class MethodIdentifier extends Identifier implements Opcodes {
case opc_istore: case opc_lstore:
case opc_fstore: case opc_dstore: case opc_astore:
case opc_ret:
stream.skip(2);
skip(stream, 2);
addr+=4;
break;
case opc_iinc:
stream.skip(4);
skip(stream, 4);
addr+=6;
break;
default:
@ -98,7 +114,7 @@ public class MethodIdentifier extends Identifier implements Opcodes {
break;
}
case opc_ret:
stream.skip(1);
skip(stream, 1);
addr+=2;
break;
case opc_sipush:
@ -108,28 +124,28 @@ public class MethodIdentifier extends Identifier implements Opcodes {
case opc_ifnull: case opc_ifnonnull:
case opc_putstatic:
case opc_putfield:
stream.skip(2);
skip(stream, 2);
addr+=3;
break;
case opc_jsr_w:
case opc_goto_w:
stream.skip(4);
skip(stream, 4);
addr+=5;
break;
case opc_tableswitch: {
int length = 7-(addr % 4);
stream.skip(length);
skip(stream, length);
int low = stream.readInt();
int high = stream.readInt();
stream.skip(4*(high-low+1));
skip(stream, 4*(high-low+1));
addr += 9 + length + 4*(high-low+1);
break;
}
case opc_lookupswitch: {
int length = 7-(addr % 4);
stream.skip(length);
skip(stream, length);
int npairs = stream.readInt();
stream.skip(8*npairs);
skip(stream, 8*npairs);
addr += 5 + length + 8*npairs;
break;
}
@ -166,7 +182,7 @@ public class MethodIdentifier extends Identifier implements Opcodes {
clazz.bundle.reachableIdentifier(clName, false);
addr += 3;
if (opcode == opc_multianewarray) {
stream.skip(1);
skip(stream, 1);
addr ++;
}
break;
@ -184,7 +200,7 @@ public class MethodIdentifier extends Identifier implements Opcodes {
addr += 3;
if (opcode == opc_invokeinterface) {
stream.skip(2);
skip(stream, 2);
addr += 2;
}
break;
@ -194,10 +210,10 @@ public class MethodIdentifier extends Identifier implements Opcodes {
if (opcode == opc_newarray
|| (opcode >= opc_bipush && opcode <= opc_aload)
|| (opcode >= opc_istore && opcode <= opc_astore)) {
stream.skip(1);
skip(stream, 1);
addr += 2;
} else if (opcode >= opc_ifeq && opcode <= opc_jsr) {
stream.skip(2);
skip(stream, 2);
addr += 3;
} else if (opcode == opc_xxxunusedxxx
|| opcode >= opc_breakpoint)
@ -242,7 +258,7 @@ public class MethodIdentifier extends Identifier implements Opcodes {
try {
analyzeCode();
} catch (IOException ex) {
ex.printStackTrace();
ex.printStackTrace(Obfuscator.err);
System.exit(0);
}
}
@ -557,7 +573,7 @@ public class MethodIdentifier extends Identifier implements Opcodes {
output.writeShort(0); // No Attributes;
output.close();
} catch (IOException ex) {
ex.printStackTrace();
ex.printStackTrace(Obfuscator.err);
code = null;
return;
}
@ -590,12 +606,12 @@ public class MethodIdentifier extends Identifier implements Opcodes {
case opc_istore: case opc_lstore:
case opc_fstore: case opc_dstore: case opc_astore:
case opc_ret:
stream.skip(2);
skip(stream, 2);
addr+=4;
break;
case opc_iinc:
stream.skip(4);
skip(stream, 4);
addr+=6;
break;
default:
@ -605,23 +621,23 @@ public class MethodIdentifier extends Identifier implements Opcodes {
}
case opc_tableswitch: {
int length = 7-(addr % 4);
stream.skip(length);
skip(stream, length);
int low = stream.readInt();
int high = stream.readInt();
stream.skip(4*(high-low+1));
skip(stream, 4*(high-low+1));
addr += 9 + length + 4*(high-low+1);
break;
}
case opc_lookupswitch: {
int length = 7-(addr % 4);
stream.skip(length);
skip(stream, length);
int npairs = stream.readInt();
stream.skip(8*npairs);
skip(stream, 8*npairs);
addr += 5 + length + 8*npairs;
break;
}
case opc_ret:
stream.skip(1);
skip(stream, 1);
addr+=2;
break;
case opc_sipush:
@ -633,28 +649,28 @@ public class MethodIdentifier extends Identifier implements Opcodes {
case opc_anewarray:
case opc_checkcast:
case opc_instanceof:
stream.skip(2);
skip(stream, 2);
addr+=3;
break;
case opc_multianewarray:
stream.skip(3);
skip(stream, 3);
addr += 4;
break;
case opc_jsr_w:
case opc_goto_w:
case opc_invokeinterface:
stream.skip(4);
skip(stream, 4);
addr+=5;
break;
default:
if (opcode == opc_newarray
|| (opcode >= opc_bipush && opcode <= opc_aload)
|| (opcode >= opc_istore && opcode <= opc_astore)) {
stream.skip(1);
skip(stream, 1);
addr += 2;
} else if (opcode >= opc_ifeq && opcode <= opc_jsr
|| opcode >= opc_getstatic && opcode <= opc_invokestatic) {
stream.skip(2);
skip(stream, 2);
addr += 3;
} else if (opcode == opc_xxxunusedxxx
|| opcode >= opc_breakpoint)
@ -664,7 +680,7 @@ public class MethodIdentifier extends Identifier implements Opcodes {
}
}
} catch (IOException ex) {
ex.printStackTrace();
ex.printStackTrace(Obfuscator.err);
}
}
}

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