From 6a84c732b1f21c0c1333389d2dd17232f9d02c33 Mon Sep 17 00:00:00 2001
From: Alula <julekonopinska@gmail.com>
Date: Sun, 23 Aug 2020 04:17:45 +0200
Subject: [PATCH] initial textscript things

---
 Cargo.toml         |   3 +-
 src/stage.rs       |   6 ++
 src/text_script.rs | 150 ++++++++++++++++++++++++++++++++++++++++++++-
 3 files changed, 155 insertions(+), 4 deletions(-)

diff --git a/Cargo.toml b/Cargo.toml
index fa927ad..744b99e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -33,6 +33,7 @@ maplit = "1.0.2"
 mint = "0.5"
 nalgebra = {version = "0.18", features = ["mint"] }
 num-traits = "0.2.12"
+owning_ref = "0.4.1"
 paste = "1.0.0"
 pretty_env_logger = "0.4.0"
 serde = "1"
@@ -41,5 +42,5 @@ smart-default = "0.5"
 strum = "0.18.0"
 strum_macros = "0.18.0"
 toml = "0.5"
-owning_ref = "0.4.1"
+varint = "0.9.0"
 winit = { version = "0.19.3" }
diff --git a/src/stage.rs b/src/stage.rs
index 45e9203..2732ed9 100644
--- a/src/stage.rs
+++ b/src/stage.rs
@@ -8,6 +8,7 @@ use log::info;
 use crate::ggez::{Context, filesystem, GameResult};
 use crate::ggez::GameError::ResourceLoadError;
 use crate::map::Map;
+use crate::text_script::TextScript;
 
 #[derive(Debug, PartialEq, Eq, Hash)]
 pub struct NpcType {
@@ -371,17 +372,22 @@ impl StageData {
 pub struct Stage {
     pub map: Map,
     pub data: StageData,
+    pub text_script: TextScript,
 }
 
 impl Stage {
     pub fn load(ctx: &mut Context, root: &str, data: &StageData) -> GameResult<Self> {
         let map_file = filesystem::open(ctx, [root, "Stage/", &data.map, ".pxm"].join(""))?;
         let attrib_file = filesystem::open(ctx, [root, "Stage/", &data.tileset.name, ".pxa"].join(""))?;
+        let tsc_file = filesystem::open(ctx, [root, "Stage/", &data.tileset.name, ".tsc"].join(""))?;
+
         let map = Map::load_from(map_file, attrib_file)?;
+        let text_script = TextScript::load_from(tsc_file)?;
 
         let stage = Self {
             map,
             data: data.clone(),
+            text_script,
         };
 
         Ok(stage)
diff --git a/src/text_script.rs b/src/text_script.rs
index f276224..360e93f 100644
--- a/src/text_script.rs
+++ b/src/text_script.rs
@@ -1,11 +1,155 @@
-use crate::ggez::{Context, GameResult};
+use std::io;
 
-struct TextScript {
+use crate::ggez::GameResult;
 
+/// Engine's internal text script VM operation codes.
+/// Based on https://www.cavestory.org/guides/basicmodding/guide/tscnotes.htm and game reverse engineering.
+pub enum OpCode {
+    // ---- Internal opcodes (used by bytecode, no TSC representation)
+    /// internal: no operation
+    NOP,
+
+    // ---- Official opcodes ----
+    /// <BOAxxxx, start boss animation
+    BOA,
+    /// <BSLxxxx, start boss fight
+    BSL,
+
+    /// <FOBxxxx, Focus on boss
+    FOB,
+    FOM,
+    FON,
+    FLA,
+    QUA,
+
+    UNI,
+    HMC,
+    SMC,
+    MM0,
+    MOV,
+    MYB,
+    MYD,
+    TRA,
+
+    END,
+    FRE,
+    FAI,
+    FAO,
+    WAI,
+    WAS,
+    KEY,
+    PRI,
+    NOD,
+    CAT,
+    SAT,
+    TUR,
+    CLO,
+    CLR,
+    FAC,
+    GIT,
+    MS2,
+    MS3,
+    MSG,
+    NUM,
+
+    ANP,
+    CNP,
+    INP,
+    MNP,
+    DNA,
+    DNP,
+    SNP,
+
+    FLm,
+    FLp,
+    MPp,
+    SKm,
+    SKp,
+
+    EQp,
+    EQm,
+    MLp,
+    ITp,
+    ITm,
+    AMp,
+    AMm,
+    TAM,
+
+    UNJ,
+    NCJ,
+    ECJ,
+    FLJ,
+    ITJ,
+    MPJ,
+    YNJ,
+    SKJ,
+    EVE,
+    AMJ,
+
+    MLP,
+    MNA,
+    CMP,
+    SMP,
+
+    CRE,
+    XX1,
+    CIL,
+    SIL,
+    ESC,
+    INI,
+    LDP,
+    PSp,
+    SLP,
+    ZAM,
+
+    AEp,
+    LIp,
+
+    SVP,
+    STC,
+
+    SOU,
+    CMU,
+    FMU,
+    RMU,
+    CPS,
+    SPS,
+    CSS,
+    SSS,
+
+    // ---- Custom opcodes, for use by modders ----
 }
 
+pub struct TextScript {}
+
 impl TextScript {
-    pub fn load(filename: &str, ctx: &mut Context) -> GameResult<TextScript> {
+    /// Loads, decrypts and compiles a text script from specified stream.
+    pub fn load_from<R: io::Read>(mut data: R) -> GameResult<TextScript> {
+        let mut buf = Vec::new();
+        data.read_to_end(&mut buf)?;
+
+        let half = buf.len() / 2;
+        let key = if let Some(0) = buf.get(half) {
+            0xf9
+        } else {
+            (-(*buf.get(half).unwrap() as isize)) as u8
+        };
+
+        for (idx, byte) in buf.iter_mut().enumerate() {
+            if idx == half {
+                continue;
+            }
+
+            *byte = byte.wrapping_add(key);
+        }
+
+        TextScript::compile(&buf)
+    }
+
+    /// Compiles a decrypted text script data into internal bytecode.
+    pub fn compile(data: &[u8]) -> GameResult<TextScript> {
+        println!("data: {}", String::from_utf8(data.to_vec())?);
+
         let tsc = TextScript {};
         Ok(tsc)
     }