2016-09-25 20:30:09 +00:00
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use avm1::types::Action;
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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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use std::io::{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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2016-11-06 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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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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2016-09-29 06:36:05 +00:00
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Some(OpCode::NextFrame) => Action::NextFrame,
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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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Some(OpCode::PreviousFrame) => Action::PreviousFrame,
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Some(OpCode::Stop) => Action::Stop,
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Some(OpCode::StopSounds) => Action::StopSounds,
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Some(OpCode::ToggleQuality) => Action::ToggleQuality,
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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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2016-11-06 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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2016-10-06 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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