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putting AS3 code reading back

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This commit is contained in:
Jindra Petřík
2014-09-23 22:24:46 +02:00
parent d89e02426e
commit 92162124f5
1 changed files with 61 additions and 48 deletions
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109
libsrc/ffdec_lib/src/com/jpexs/decompiler/flash/abc/avm2/AVM2Code.java
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@@ -784,62 +784,75 @@ public class AVM2Code implements Cloneable {
return null;
}
public AVM2Code(ABCInputStream ais) throws IOException {
//Note: special jump handling like in AS1/2 is not needed as code must pass FlashPlayer verification
public AVM2Code(ABCInputStream ais) throws IOException {
Map<Long, AVM2Instruction> codeMap = new TreeMap<>();
DumpInfo diParent = ais.dumpInfo;
try {
while (ais.available() > 0) {
DumpInfo di = ais.newDumpLevel("instruction", "instruction");
long startOffset = ais.getPosition();
int instructionCode = ais.read("instructionCode");
InstructionDefinition instr = instructionSetByCode[instructionCode];
if (di != null) {
di.name = instr.instructionName;
}
if (instr != null) {
int[] actualOperands = null;
if (instructionCode == 0x1b) { //switch
int firstOperand = ais.readS24("default_offset");
int case_count = ais.readU30("case_count");
actualOperands = new int[case_count + 3];
actualOperands[0] = firstOperand;
actualOperands[1] = case_count;
for (int c = 0; c < case_count + 1; c++) {
actualOperands[2 + c] = ais.readS24("operand");
}
} else {
if (instr.operands.length > 0) {
actualOperands = new int[instr.operands.length];
for (int op = 0; op < instr.operands.length; op++) {
switch (instr.operands[op] & 0xff00) {
case OPT_U30:
actualOperands[op] = ais.readU30("operand");
break;
case OPT_U8:
actualOperands[op] = ais.readU8("operand");
break;
case OPT_BYTE:
actualOperands[op] = (byte) ais.read("operand");
break;
case OPT_S24:
actualOperands[op] = ais.readS24("operand");
break;
List<Long> addresses = new ArrayList<>();
addresses.add(ais.getPosition());
while (!addresses.isEmpty()) {
long address = addresses.remove(0);
if (codeMap.containsKey(address)) {
continue;
}
try {
ais.seek(address);
while (ais.available() > 0) {
DumpInfo di = ais.newDumpLevel("instruction", "instruction");
long startOffset = ais.getPosition();
int instructionCode = ais.read("instructionCode");
InstructionDefinition instr = instructionSetByCode[instructionCode];
if (di != null) {
di.name = instr.instructionName;
}
if (instr != null) {
int[] actualOperands = null;
if (instructionCode == 0x1b) { //switch
int firstOperand = ais.readS24("default_offset");
int case_count = ais.readU30("case_count");
actualOperands = new int[case_count + 3];
actualOperands[0] = firstOperand;
actualOperands[1] = case_count;
for (int c = 0; c < case_count + 1; c++) {
actualOperands[2 + c] = ais.readS24("actualOperand");
}
} else {
if (instr.operands.length > 0) {
actualOperands = new int[instr.operands.length];
for (int op = 0; op < instr.operands.length; op++) {
switch (instr.operands[op] & 0xff00) {
case OPT_U30:
actualOperands[op] = ais.readU30("operand");
break;
case OPT_U8:
actualOperands[op] = ais.read("operand");
break;
case OPT_BYTE:
actualOperands[op] = (byte) ais.read("operand");
break;
case OPT_S24:
actualOperands[op] = ais.readS24("operand");
break;
}
}
}
}
}
codeMap.put(startOffset, new AVM2Instruction(startOffset, instr, actualOperands));
ais.endDumpLevel(instr.instructionCode);
} else {
ais.endDumpLevel();
break; // Unknown instructions are ignored (Some of the obfuscators add unknown instructions)
if (instr instanceof IfTypeIns) {
long target = ais.getPosition() + actualOperands[0];
addresses.add(target);
}
codeMap.put(startOffset, new AVM2Instruction(startOffset, instr, actualOperands));
ais.endDumpLevel(instr.instructionCode);
} else {
ais.endDumpLevel();
break; // Unknown instructions are ignored (Some of the obfuscators add unknown instructions)
//throw new UnknownInstructionCode(instructionCode);
}
}
} catch (EndOfStreamException ex) {
// lookupswitch obfuscation, ignore
ais.endDumpLevelUntil(diParent);
}
} catch (EndOfStreamException ex) {
ais.endDumpLevelUntil(diParent);
}
code.addAll(codeMap.values());