private With decodeWith(ActionFactory factory)
{
With a = new With();
int size = reader.readUI16();
int target = size + reader.Offset;
a.endWith = factory.getLabel(target);
return(a);
}
private Branch decodeBranch(int code, ActionFactory factory)
{
Branch a = new Branch(code);
int offset = reader.readSI16();
int target = offset + reader.Offset;
a.target = factory.getLabel(target);
return(a);
}
/// <summary> consume actions until length bytes are used up</summary>
/// <param name="length">
/// </param>
/// <param name="throwExceptions">- if false exceptions will NOT be thrown. This is
/// used for decoding a series of opcodes which may not be complete on their own.
/// </param>
/// <throws> IOException </throws>
public virtual ActionList decode(int length, bool throwExceptions)
{
int startOffset = reader.Offset;
int end = startOffset + length;
bool ending = false;
ActionFactory factory = new ActionFactory(length, startOffset, actionCount);
try
{
for (int offset = startOffset; offset < end; offset = reader.Offset)
{
int opcode = reader.readUI8();
if (opcode > 0)
{
if (ending)
{
throw new SwfFormatException("unexpected bytes after sactionEnd: " + opcode);
}
factory.setActionOffset(actionCount, offset);
decodeAction(opcode, offset, factory);
actionCount++;
}
else if (opcode == 0)
{
ending = true;
}
else
{
break;
}
}
// keep track of the end too
factory.setActionOffset(actionCount, reader.Offset);
}
catch (System.IndexOutOfRangeException aio)
{
if (throwExceptions)
{
throw aio;
}
}
catch (SwfFormatException swf)
{
if (throwExceptions)
{
throw swf;
}
}
return(factory.createActionList(keepOffsets));
}
private WaitForFrame decodeWaitForFrame(int opcode, ActionFactory factory)
{
WaitForFrame a = new WaitForFrame(opcode);
if (opcode == Flash.Swf.ActionConstants.sactionWaitForFrame)
{
a.frame = reader.readUI16();
}
int skipCount = reader.readUI8();
int skipTarget = actionCount + 1 + skipCount;
factory.addSkipEntry(a, skipTarget);
return(a);
}
/// <summary> consume actions until length bytes are used up</summary>
/// <param name="length">
/// </param>
/// <param name="throwExceptions">- if false exceptions will NOT be thrown. This is
/// used for decoding a series of opcodes which may not be complete on their own.
/// </param>
/// <throws> IOException </throws>
public virtual ActionList decode(int length, bool throwExceptions)
{
int startOffset = reader.Offset;
int end = startOffset + length;
bool ending = false;
ActionFactory factory = new ActionFactory(length, startOffset, actionCount);
try
{
for (int offset = startOffset; offset < end; offset = reader.Offset)
{
int opcode = reader.readUI8();
if (opcode > 0)
{
if (ending)
throw new SwfFormatException("unexpected bytes after sactionEnd: " + opcode);
factory.setActionOffset(actionCount, offset);
decodeAction(opcode, offset, factory);
actionCount++;
}
else if (opcode == 0)
{
ending = true;
}
else
{
break;
}
}
// keep track of the end too
factory.setActionOffset(actionCount, reader.Offset);
}
catch (System.IndexOutOfRangeException aio)
{
if (throwExceptions)
throw aio;
}
catch (SwfFormatException swf)
{
if (throwExceptions)
throw swf;
}
return factory.createActionList(keepOffsets);
}
private Try decodeTry(ActionFactory factory)
{
Try a = new Try();
a.flags = reader.readUI8();
int trySize = reader.readUI16();
int catchSize = reader.readUI16();
int finallySize = reader.readUI16();
if (a.hasRegister())
{
a.catchReg = reader.readUI8();
}
else
{
a.catchName = reader.readString();
}
// we have now consumed the try action. what follows is label mgmt
int tryEnd = reader.Offset + trySize;
a.endTry = factory.getLabel(tryEnd);
// place the catchLabel to mark the end point of the catch handler
if (a.hasCatch())
{
a.endCatch = factory.getLabel(tryEnd + catchSize);
}
// place the finallyLabel to mark the end point of the finally handler
if (a.hasFinally())
{
a.endFinally = factory.getLabel(tryEnd + finallySize + (a.hasCatch()?catchSize:0));
}
return(a);
}
private With decodeWith(ActionFactory factory)
{
With a = new With();
int size = reader.readUI16();
int target = size + reader.Offset;
a.endWith = factory.getLabel(target);
return a;
}
private Push decodePush(int offset, int end, ActionFactory factory)
{
Push p;
do
{
int pushType = reader.readUI8();
switch (pushType)
{
case Flash.Swf.ActionConstants.kPushStringType: // string
p = ActionFactory.createPush(reader.readString());
break;
case Flash.Swf.ActionConstants.kPushFloatType: // float
byte[] floatBytes = new byte[4];
reader.read(floatBytes, 0, 4);
p = ActionFactory.createPush(BitConverter.ToSingle(floatBytes, 0)); // value
break;
case Flash.Swf.ActionConstants.kPushNullType: // null
p = ActionFactory.createPushNull();
break;
case Flash.Swf.ActionConstants.kPushUndefinedType: // undefined
p = ActionFactory.createPushUndefined();
break;
case Flash.Swf.ActionConstants.kPushRegisterType: // register
p = ActionFactory.createPushRegister(reader.readUI8());
break;
case Flash.Swf.ActionConstants.kPushBooleanType: // boolean
p = ActionFactory.createPush(reader.readUI8() != 0);
break;
case Flash.Swf.ActionConstants.kPushDoubleType: // double
// read two 32 bit little-endian values in big-endian order. weird.
byte[] doubleBytes = new byte[8];
reader.read(doubleBytes, 4, 4);
reader.read(doubleBytes, 0, 4);
p = ActionFactory.createPush(BitConverter.ToDouble(doubleBytes, 0));
break;
case Flash.Swf.ActionConstants.kPushIntegerType: // integer
p = ActionFactory.createPush((int) reader.readUI32());
break;
case Flash.Swf.ActionConstants.kPushConstant8Type: // 8-bit cpool reference
p = ActionFactory.createPushCpool(reader.readUI8());
break;
case Flash.Swf.ActionConstants.kPushConstant16Type: // 16-bit cpool reference
p = ActionFactory.createPushCpool(reader.readUI16());
break;
default:
throw new SwfFormatException("Unknown push data type " + pushType);
}
factory.setAction(offset, p);
offset = reader.Offset;
}
while (offset < end);
return p;
}
private WaitForFrame decodeWaitForFrame(int opcode, ActionFactory factory)
{
WaitForFrame a = new WaitForFrame(opcode);
if (opcode == Flash.Swf.ActionConstants.sactionWaitForFrame)
a.frame = reader.readUI16();
int skipCount = reader.readUI8();
int skipTarget = actionCount + 1 + skipCount;
factory.addSkipEntry(a, skipTarget);
return a;
}
private Branch decodeBranch(int code, ActionFactory factory)
{
Branch a = new Branch(code);
int offset = reader.readSI16();
int target = offset + reader.Offset;
a.target = factory.getLabel(target);
return a;
}
private Try decodeTry(ActionFactory factory)
{
Try a = new Try();
a.flags = reader.readUI8();
int trySize = reader.readUI16();
int catchSize = reader.readUI16();
int finallySize = reader.readUI16();
if (a.hasRegister())
a.catchReg = reader.readUI8();
else
a.catchName = reader.readString();
// we have now consumed the try action. what follows is label mgmt
int tryEnd = reader.Offset + trySize;
a.endTry = factory.getLabel(tryEnd);
// place the catchLabel to mark the end point of the catch handler
if (a.hasCatch())
a.endCatch = factory.getLabel(tryEnd + catchSize);
// place the finallyLabel to mark the end point of the finally handler
if (a.hasFinally())
a.endFinally = factory.getLabel(tryEnd + finallySize + (a.hasCatch()?catchSize:0));
return a;
}
private void decodeAction(int opcode, int offset, ActionFactory factory)
{
LineRecord line = debug != null?debug.getLine(offset):null;
if (line != null)
{
factory.setLine(offset, line);
}
// interleave register records in the action list
RegisterRecord record = (debug != null)?debug.getRegisters(offset):null;
if (record != null)
{
factory.setRegister(offset, record);
}
Action a;
if (opcode < 0x80)
{
a = ActionFactory.createAction(opcode);
factory.setAction(offset, a);
return ;
}
int len = reader.readUI16();
int pos = offset + 3;
switch (opcode)
{
case Flash.Swf.ActionConstants.sactionDefineFunction:
a = decodeDefineFunction(pos, len);
factory.setAction(offset, a);
return ;
case Flash.Swf.ActionConstants.sactionDefineFunction2:
a = decodeDefineFunction2(pos, len);
factory.setAction(offset, a);
return ;
case Flash.Swf.ActionConstants.sactionWith:
a = decodeWith(factory);
break;
case Flash.Swf.ActionConstants.sactionTry:
a = decodeTry(factory);
break;
case Flash.Swf.ActionConstants.sactionPush:
Push p = decodePush(offset, pos + len, factory);
checkConsumed(pos, len, p);
return ;
case Flash.Swf.ActionConstants.sactionStrictMode:
a = decodeStrictMode();
break;
case Flash.Swf.ActionConstants.sactionCall:
// this actions opcode has the high bit set, but there is no length. considered a permanent bug.
a = ActionFactory.createCall();
break;
case Flash.Swf.ActionConstants.sactionGotoFrame:
a = decodeGotoFrame();
break;
case Flash.Swf.ActionConstants.sactionGetURL:
a = decodeGetURL();
break;
case Flash.Swf.ActionConstants.sactionStoreRegister:
a = decodeStoreRegister();
break;
case Flash.Swf.ActionConstants.sactionConstantPool:
a = decodeConstantPool();
break;
case Flash.Swf.ActionConstants.sactionWaitForFrame:
a = decodeWaitForFrame(opcode, factory);
break;
case Flash.Swf.ActionConstants.sactionSetTarget:
a = decodeSetTarget();
break;
case Flash.Swf.ActionConstants.sactionGotoLabel:
a = decodeGotoLabel();
break;
case Flash.Swf.ActionConstants.sactionWaitForFrame2:
a = decodeWaitForFrame(opcode, factory);
break;
case Flash.Swf.ActionConstants.sactionGetURL2:
a = decodeGetURL2();
break;
case Flash.Swf.ActionConstants.sactionJump:
case Flash.Swf.ActionConstants.sactionIf:
a = decodeBranch(opcode, factory);
break;
case Flash.Swf.ActionConstants.sactionGotoFrame2:
a = decodeGotoFrame2();
break;
default:
a = decodeUnknown(opcode, len);
break;
}
checkConsumed(pos, len, a);
factory.setAction(offset, a);
}
private Push decodePush(int offset, int end, ActionFactory factory)
{
Push p;
do
{
int pushType = reader.readUI8();
switch (pushType)
{
case Flash.Swf.ActionConstants.kPushStringType: // string
p = ActionFactory.createPush(reader.readString());
break;
case Flash.Swf.ActionConstants.kPushFloatType: // float
byte[] floatBytes = new byte[4];
reader.read(floatBytes, 0, 4);
p = ActionFactory.createPush(BitConverter.ToSingle(floatBytes, 0)); // value
break;
case Flash.Swf.ActionConstants.kPushNullType: // null
p = ActionFactory.createPushNull();
break;
case Flash.Swf.ActionConstants.kPushUndefinedType: // undefined
p = ActionFactory.createPushUndefined();
break;
case Flash.Swf.ActionConstants.kPushRegisterType: // register
p = ActionFactory.createPushRegister(reader.readUI8());
break;
case Flash.Swf.ActionConstants.kPushBooleanType: // boolean
p = ActionFactory.createPush(reader.readUI8() != 0);
break;
case Flash.Swf.ActionConstants.kPushDoubleType: // double
// read two 32 bit little-endian values in big-endian order. weird.
byte[] doubleBytes = new byte[8];
reader.read(doubleBytes, 4, 4);
reader.read(doubleBytes, 0, 4);
p = ActionFactory.createPush(BitConverter.ToDouble(doubleBytes, 0));
break;
case Flash.Swf.ActionConstants.kPushIntegerType: // integer
p = ActionFactory.createPush((int)reader.readUI32());
break;
case Flash.Swf.ActionConstants.kPushConstant8Type: // 8-bit cpool reference
p = ActionFactory.createPushCpool(reader.readUI8());
break;
case Flash.Swf.ActionConstants.kPushConstant16Type: // 16-bit cpool reference
p = ActionFactory.createPushCpool(reader.readUI16());
break;
default:
throw new SwfFormatException("Unknown push data type " + pushType);
}
factory.setAction(offset, p);
offset = reader.Offset;
}while (offset < end);
return(p);
}
private StrictMode decodeStrictMode()
{
bool mode = reader.readUI8() != 0;
return(ActionFactory.createStrictMode(mode));
}
private StoreRegister decodeStoreRegister()
{
int register = reader.readUI8();
return(ActionFactory.createStoreRegister(register));
}
private void decodeAction(int opcode, int offset, ActionFactory factory)
{
LineRecord line = debug != null?debug.getLine(offset) : null;
if (line != null)
{
factory.setLine(offset, line);
}
// interleave register records in the action list
RegisterRecord record = (debug != null)?debug.getRegisters(offset):null;
if (record != null)
{
factory.setRegister(offset, record);
}
Action a;
if (opcode < 0x80)
{
a = ActionFactory.createAction(opcode);
factory.setAction(offset, a);
return;
}
int len = reader.readUI16();
int pos = offset + 3;
switch (opcode)
{
case Flash.Swf.ActionConstants.sactionDefineFunction:
a = decodeDefineFunction(pos, len);
factory.setAction(offset, a);
return;
case Flash.Swf.ActionConstants.sactionDefineFunction2:
a = decodeDefineFunction2(pos, len);
factory.setAction(offset, a);
return;
case Flash.Swf.ActionConstants.sactionWith:
a = decodeWith(factory);
break;
case Flash.Swf.ActionConstants.sactionTry:
a = decodeTry(factory);
break;
case Flash.Swf.ActionConstants.sactionPush:
Push p = decodePush(offset, pos + len, factory);
checkConsumed(pos, len, p);
return;
case Flash.Swf.ActionConstants.sactionStrictMode:
a = decodeStrictMode();
break;
case Flash.Swf.ActionConstants.sactionCall:
// this actions opcode has the high bit set, but there is no length. considered a permanent bug.
a = ActionFactory.createCall();
break;
case Flash.Swf.ActionConstants.sactionGotoFrame:
a = decodeGotoFrame();
break;
case Flash.Swf.ActionConstants.sactionGetURL:
a = decodeGetURL();
break;
case Flash.Swf.ActionConstants.sactionStoreRegister:
a = decodeStoreRegister();
break;
case Flash.Swf.ActionConstants.sactionConstantPool:
a = decodeConstantPool();
break;
case Flash.Swf.ActionConstants.sactionWaitForFrame:
a = decodeWaitForFrame(opcode, factory);
break;
case Flash.Swf.ActionConstants.sactionSetTarget:
a = decodeSetTarget();
break;
case Flash.Swf.ActionConstants.sactionGotoLabel:
a = decodeGotoLabel();
break;
case Flash.Swf.ActionConstants.sactionWaitForFrame2:
a = decodeWaitForFrame(opcode, factory);
break;
case Flash.Swf.ActionConstants.sactionGetURL2:
a = decodeGetURL2();
break;
case Flash.Swf.ActionConstants.sactionJump:
case Flash.Swf.ActionConstants.sactionIf:
a = decodeBranch(opcode, factory);
break;
case Flash.Swf.ActionConstants.sactionGotoFrame2:
a = decodeGotoFrame2();
break;
default:
a = decodeUnknown(opcode, len);
break;
}
checkConsumed(pos, len, a);
factory.setAction(offset, a);
}
