2016-11-10 02:49:15 +00:00
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use avm1::types::{Action, SendVarsMethod, Value};
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2016-09-25 20:30:09 +00:00
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use avm1::opcode::OpCode;
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2016-11-08 18:51:34 +00:00
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use read::SwfRead;
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2016-11-09 23:50:54 +00:00
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use std::io::{Error, ErrorKind, Read, Result};
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2016-09-25 20:30:09 +00:00
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2016-10-06 05:15:18 +00:00
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pub struct Reader<R: Read> {
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2016-09-25 20:30:09 +00:00
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inner: R,
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version: u8,
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}
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2016-11-08 18:51:34 +00:00
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impl<R: Read> SwfRead<R> for Reader<R> {
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fn get_inner(&mut self) -> &mut R {
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&mut self.inner
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}
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}
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2016-10-06 05:15:18 +00:00
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impl<R: Read> Reader<R> {
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pub fn new(inner: R, version: u8) -> Reader<R> {
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Reader { inner: inner, version: version }
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2016-09-25 20:30:09 +00:00
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}
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2016-09-29 06:36:05 +00:00
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pub fn read_action_list(&mut self) -> Result<Vec<Action>> {
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let mut actions = Vec::new();
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while let Some(action) = try!(self.read_action()) {
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actions.push(action);
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}
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Ok(actions)
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}
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2016-09-25 20:30:09 +00:00
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pub fn read_action(&mut self) -> Result<Option<Action>> {
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2016-09-29 06:36:05 +00:00
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let (opcode, length) = try!(self.read_opcode_and_length());
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2016-10-06 05:15:18 +00:00
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let mut action_reader = Reader::new(self.inner.by_ref().take(length as u64), self.version);
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2016-09-29 06:36:05 +00:00
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use num::FromPrimitive;
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let action = match OpCode::from_u8(opcode) {
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Some(OpCode::End) => return Ok(None),
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2016-11-10 00:10:40 +00:00
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Some(OpCode::Add) => Action::Add,
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2016-11-10 02:49:15 +00:00
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Some(OpCode::And) => Action::And,
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Some(OpCode::AsciiToChar) => Action::AsciiToChar,
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Some(OpCode::Call) => Action::Call,
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Some(OpCode::CharToAscii) => Action::CharToAscii,
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Some(OpCode::CloneSprite) => Action::CloneSprite,
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2016-11-10 00:10:40 +00:00
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Some(OpCode::Divide) => Action::Divide,
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2016-11-10 02:49:15 +00:00
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Some(OpCode::EndDrag) => Action::EndDrag,
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Some(OpCode::Equals) => Action::Equals,
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Some(OpCode::GetProperty) => Action::GetProperty,
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Some(OpCode::GetTime) => Action::GetTime,
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2016-11-06 02:44:49 +00:00
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Some(OpCode::GetUrl) => Action::GetUrl {
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url: try!(action_reader.read_c_string()),
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target: try!(action_reader.read_c_string()),
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},
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2016-11-10 02:49:15 +00:00
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Some(OpCode::GetUrl2) => {
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let flags = try!(action_reader.read_u8());
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Action::GetUrl2 {
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is_target_sprite: flags & 0b10 != 0,
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is_load_vars: flags & 0b1 != 0,
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send_vars_method: match flags >> 6 {
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0 => SendVarsMethod::None,
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1 => SendVarsMethod::Get,
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2 => SendVarsMethod::Post,
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_ => return Err(Error::new(ErrorKind::InvalidData, "Invalid HTTP method in ActionGetUrl2")),
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}
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}
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},
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Some(OpCode::GetVariable) => Action::GetVariable,
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2016-11-06 02:44:49 +00:00
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Some(OpCode::GotoFrame) => {
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2016-11-08 18:51:34 +00:00
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let frame = try!(action_reader.read_u16());
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2016-11-06 02:44:49 +00:00
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Action::GotoFrame(frame)
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},
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2016-11-10 02:49:15 +00:00
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Some(OpCode::GotoFrame2) => {
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let flags = try!(action_reader.read_u8());
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Action::GotoFrame2 {
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set_playing: flags & 0b1 != 0,
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scene_offset: if flags & 0b10 != 0 {
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try!(action_reader.read_u16())
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} else { 0 },
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}
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},
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2016-11-09 00:53:36 +00:00
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Some(OpCode::GotoLabel) => Action::GotoLabel(try!(action_reader.read_c_string())),
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2016-11-10 02:49:15 +00:00
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Some(OpCode::If) => Action::If { offset: try!(action_reader.read_i16()) },
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Some(OpCode::Jump) => Action::Jump { offset: try!(action_reader.read_i16()) },
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Some(OpCode::Less) => Action::Less,
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Some(OpCode::MBAsciiToChar) => Action::MBAsciiToChar,
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Some(OpCode::MBCharToAscii) => Action::MBCharToAscii,
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Some(OpCode::MBStringExtract) => Action::MBStringExtract,
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Some(OpCode::MBStringLength) => Action::MBStringLength,
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2016-11-10 00:10:40 +00:00
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Some(OpCode::Multiply) => Action::Multiply,
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2016-09-29 06:36:05 +00:00
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Some(OpCode::NextFrame) => Action::NextFrame,
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2016-11-10 02:49:15 +00:00
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Some(OpCode::Not) => Action::Not,
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Some(OpCode::Or) => Action::Or,
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2016-10-07 07:18:56 +00:00
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Some(OpCode::Play) => Action::Play,
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2016-11-09 01:05:53 +00:00
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Some(OpCode::Pop) => Action::Pop,
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2016-10-07 07:18:56 +00:00
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Some(OpCode::PreviousFrame) => Action::PreviousFrame,
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2016-11-09 23:50:54 +00:00
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// TODO: Verify correct version for complex types.
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Some(OpCode::Push) => {
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let mut values = vec![];
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while let Ok(value) = action_reader.read_push_value() {
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values.push(value);
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};
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Action::Push(values)
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},
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2016-11-10 02:49:15 +00:00
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Some(OpCode::RandomNumber) => Action::RandomNumber,
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Some(OpCode::RemoveSprite) => Action::RemoveSprite,
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Some(OpCode::SetProperty) => Action::SetProperty,
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2016-11-08 23:35:31 +00:00
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Some(OpCode::SetTarget) => Action::SetTarget(try!(action_reader.read_c_string())),
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2016-11-10 02:49:15 +00:00
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Some(OpCode::SetTarget2) => Action::SetTarget2,
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Some(OpCode::SetVariable) => Action::SetVariable,
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Some(OpCode::StartDrag) => Action::StartDrag,
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2016-10-07 07:18:56 +00:00
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Some(OpCode::Stop) => Action::Stop,
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Some(OpCode::StopSounds) => Action::StopSounds,
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2016-11-10 02:49:15 +00:00
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Some(OpCode::StringAdd) => Action::StringAdd,
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Some(OpCode::StringEquals) => Action::StringEquals,
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Some(OpCode::StringExtract) => Action::StringExtract,
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Some(OpCode::StringLength) => Action::StringLength,
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Some(OpCode::StringLess) => Action::StringLess,
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2016-11-10 00:10:40 +00:00
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Some(OpCode::Subtract) => Action::Subtract,
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2016-11-10 02:49:15 +00:00
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Some(OpCode::ToInteger) => Action::ToInteger,
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2016-10-07 07:18:56 +00:00
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Some(OpCode::ToggleQuality) => Action::ToggleQuality,
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2016-11-10 02:49:15 +00:00
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Some(OpCode::Trace) => Action::Trace,
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2016-11-06 02:44:49 +00:00
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Some(OpCode::WaitForFrame) => Action::WaitForFrame {
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2016-11-08 18:51:34 +00:00
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frame: try!(action_reader.read_u16()),
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num_actions_to_skip: try!(action_reader.read_u8()),
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2016-11-10 02:49:15 +00:00
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},
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Some(OpCode::WaitForFrame2) => Action::WaitForFrame2 {
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num_actions_to_skip: try!(action_reader.read_u8()),
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2016-11-06 02:44:49 +00:00
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},
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2016-09-29 06:36:05 +00:00
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_ => {
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let mut data = Vec::with_capacity(length);
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try!(action_reader.inner.read_to_end(&mut data));
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Action::Unknown { opcode: opcode, data: data }
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}
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};
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Ok(Some(action))
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}
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pub fn read_opcode_and_length(&mut self) -> Result<(u8, usize)> {
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2016-11-08 18:51:34 +00:00
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let opcode = try!(self.read_u8());
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2016-09-29 06:36:05 +00:00
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let length = if opcode >= 0x80 {
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2016-11-08 18:51:34 +00:00
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try!(self.read_u16()) as usize
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2016-09-29 06:36:05 +00:00
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} else { 0 };
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Ok((opcode, length))
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2016-09-25 20:30:09 +00:00
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}
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2016-11-09 23:50:54 +00:00
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fn read_push_value(&mut self) -> Result<Value> {
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let value = match try!(self.read_u8()) {
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0 => Value::Str(try!(self.read_c_string())),
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1 => Value::Float(try!(self.read_f32())),
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2 => Value::Null,
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3 => Value::Undefined,
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4 => Value::Register(try!(self.read_u8())),
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5 => Value::Bool(try!(self.read_u8()) != 0),
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6 => Value::Double(try!(self.read_f64())),
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7 => Value::Int(try!(self.read_u32())),
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8 => Value::ConstantPool(try!(self.read_u8()) as u16),
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9 => Value::ConstantPool(try!(self.read_u16())),
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_ => return Err(Error::new(ErrorKind::InvalidData, "Invalid value type in ActionPush")),
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};
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Ok(value)
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}
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2016-10-06 06:49:34 +00:00
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}
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#[cfg(test)]
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pub mod tests {
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use super::*;
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use test_data;
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#[test]
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fn read_action() {
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for (swf_version, expected_action, action_bytes) in test_data::avm1_tests() {
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let mut reader = Reader::new(&action_bytes[..], swf_version);
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let parsed_action = reader.read_action().unwrap().unwrap();
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if parsed_action != expected_action {
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// Failed, result doesn't match.
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panic!(
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"Incorrectly parsed action.\nRead:\n{:?}\n\nExpected:\n{:?}",
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parsed_action,
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expected_action
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);
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}
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}
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}
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2016-09-25 20:30:09 +00:00
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}
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