swf: Decode and encode the `applytype` op.

swf/src/avm2/opcode.rs

@@ -2,6 +2,7 @@
 pub enum OpCode {
     Add = 0xA0,
     AddI = 0xC5,
+    ApplyType = 0x53,
     AsType = 0x86,
     AsTypeLate = 0x87,
     BitAnd = 0xA8,

swf/src/avm2/read.rs

@@ -519,6 +519,9 @@ impl<'a> Reader<'a> {
         let op = match opcode {
             OpCode::Add => Op::Add,
             OpCode::AddI => Op::AddI,
+            OpCode::ApplyType => Op::ApplyType {
+                num_types: self.read_u30()?,
+            },
             OpCode::AsType => Op::AsType {
                 type_name: self.read_index()?,
             },

swf/src/avm2/types.rs

@@ -233,6 +233,9 @@ pub struct Script {
 pub enum Op {
     Add,
     AddI,
+    ApplyType {
+        num_types: u32,
+    },
     AsType {
         type_name: Index<Multiname>,
     },

swf/src/avm2/write.rs

@@ -603,6 +603,10 @@ impl<W: Write> Writer<W> {
         match *op {
             Op::Add => self.write_opcode(OpCode::Add)?,
             Op::AddI => self.write_opcode(OpCode::AddI)?,
+            Op::ApplyType { num_types } => {
+                self.write_opcode(OpCode::ApplyType)?;
+                self.write_u30(num_types)?;
+            }
             Op::AsType { ref type_name } => {
                 self.write_opcode(OpCode::AsType)?;
                 self.write_index(type_name)?;