Mercurial > touhou

annotate formats/src/th06/msg.rs @ 792:11bc22bad1bf default tip

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python: Replace the image crate with png We weren’t using any of its features anyway, so the png crate is exactly what we need, without the many heavy dependencies of image. https://github.com/image-rs/image-png/pull/670 will eventually make it even faster to build.
author Link Mauve <linkmauve@linkmauve.fr>
date Sat, 17 Jan 2026 22:22:25 +0100
parents a30ce01b9154
children
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1 //! MSG format support.
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2
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3 use encoding_rs::SHIFT_JIS;
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4 use nom::{
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5 multi::length_count,
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6 number::complete::{le_u16, le_u32, le_u8},
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7 IResult, Parser,
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8 };
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9 use std::collections::BTreeMap;
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10
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11 /// Parse a SHIFT_JIS byte string of length 34 into a String.
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12 #[allow(non_snake_case)]
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13 pub fn le_String(i: &[u8]) -> IResult<&[u8], String> {
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14 let data = i.splitn(2, |c| *c == b'\0').nth(0).unwrap();
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15 let (string, _encoding, _replaced) = SHIFT_JIS.decode(data);
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16 Ok((b"", string.into_owned()))
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17 }
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18
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19 /// A single instruction, part of a `Script`.
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20 #[derive(Debug, Clone)]
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21 pub struct Call {
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22 /// Time at which this instruction will be called.
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23 pub time: u16,
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24
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25 /// The instruction to call.
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26 pub instr: Instruction,
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27 }
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28
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29 /// Main struct of the MSG format.
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30 #[derive(Debug, Clone)]
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31 pub struct Msg {
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32 /// Map of indices to scripts in this msg.
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33 pub scripts: BTreeMap<u8, Vec<Call>>,
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34 }
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35
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36 impl Msg {
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37 /// Parse a slice of bytes into a `Msg` struct.
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38 pub fn from_slice(data: &[u8]) -> IResult<&[u8], Msg> {
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39 parse_msg.parse(data)
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40 }
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41 }
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42
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43 macro_rules! gen_match {
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44 ($arg_type:ident) => {
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45 ${concat(le_, $arg_type)}
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46 };
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47 }
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48
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49 macro_rules! declare_msg_instructions {
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50 ($($opcode:tt => fn $name:ident($($arg:ident: $arg_type:ident),*)),*,) => {
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51 /// Available instructions in a `Msg`.
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52 #[allow(missing_docs)]
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53 #[derive(Debug, Clone, PartialEq)]
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54 pub enum Instruction {
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55 $(
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56 $name($($arg_type),*)
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57 ),*
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58 }
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59
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60 fn parse_instruction_args(mut i: &[u8], opcode: u8) -> IResult<&[u8], Instruction> {
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61 let instr = match opcode {
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62 $(
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63 $opcode => {
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64 $(
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65 let (i2, $arg) = gen_match!($arg_type)(i)?;
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66 i = i2;
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67 )*
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68 Instruction::$name($($arg),*)
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69 }
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70 )*
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71 // XXX: use a more specific error instead.
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72 _ => return Err(nom::Err::Failure(nom::error::Error::new(i, nom::error::ErrorKind::Eof)))
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73 };
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74 Ok((i, instr))
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75 }
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76 };
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77 }
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78
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79 declare_msg_instructions! {
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80 0 => fn Unk1(),
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81 1 => fn Enter(side: u16, effect: u16),
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82 2 => fn ChangeFace(side: u16, index: u16),
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83 3 => fn DisplayText(side: u16, index: u16, text: String),
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84 4 => fn Pause(duration: u32),
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85 5 => fn Animate(side: u16, effect: u16),
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86 6 => fn SpawnEnemySprite(),
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87 7 => fn ChangeMusic(track: u32),
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88 8 => fn DisplayDescription(side: u16, index: u16, text: String),
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89 9 => fn ShowScores(unk1: u32),
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90 10 => fn Freeze(),
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91 11 => fn NextStage(),
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92 12 => fn Unk2(),
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93 13 => fn SetAllowSkip(boolean: u32),
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94 14 => fn Unk3(),
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95 }
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96
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97 fn parse_msg(input: &[u8]) -> IResult<&[u8], Msg> {
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98 let (mut i, entry_offsets) = length_count(le_u32, le_u32).parse(input)?;
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99 let first_offset = entry_offsets[0];
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100
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101 let mut scripts = BTreeMap::new();
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102 for (index, offset) in entry_offsets
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103 .into_iter()
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104 .enumerate()
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105 .map(|(index, offset)| (index as u8, offset))
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106 {
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107 if input.len() < offset as usize {
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108 return Err(nom::Err::Failure(nom::error::Error::new(
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109 input,
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110 nom::error::ErrorKind::Eof,
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111 )));
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112 }
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113
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114 // In EoSD, Reimu’s scripts start at 0, and Marisa’s ones at 10.
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115 // If Reimu has less than 10 scripts, the remaining offsets are equal to her first.
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116 if index > 0 && offset == first_offset {
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117 continue;
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118 }
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119
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120 i = &input[offset as usize..];
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121 let mut instructions = Vec::new();
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122 loop {
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123 let (i2, (time, opcode, size)) = (le_u16, le_u8, le_u8).parse(i)?;
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124 if time == 0 && opcode == 0 && size == 0 {
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125 break;
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126 }
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127 let (i2, data) = (&i2[size as usize..], &i2[..size as usize]);
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128 let (empty, instr) = parse_instruction_args(data, opcode)?;
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129 assert!(empty.is_empty());
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130 instructions.push(Call { time, instr });
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131 i = i2;
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132 }
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133 scripts.insert(index, instructions);
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134 }
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135
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136 Ok((i, Msg { scripts }))
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137 }
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138
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139 #[cfg(test)]
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140 mod tests {
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141 use super::*;
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142 use std::fs::File;
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143 use std::io::{self, Read};
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144
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145 #[test]
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146 fn msg() {
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147 println!("{}", std::env::current_dir().unwrap().display());
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148 let file = File::open("EoSD/ST/msg1.dat").unwrap();
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149 let mut file = io::BufReader::new(file);
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150 let mut buf = Vec::new();
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151 file.read_to_end(&mut buf).unwrap();
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152 let (_, msg) = Msg::from_slice(&buf).unwrap();
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153 assert_eq!(msg.scripts.len(), 4);
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154 assert_eq!(msg.scripts[&0].len(), 89);
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155 assert_eq!(msg.scripts[&1].len(), 13);
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156 assert_eq!(msg.scripts[&10].len(), 58);
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157 assert_eq!(msg.scripts[&11].len(), 13);
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158 let script = &msg.scripts[&0];
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159 assert_eq!(script[3].time, 60);
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160 assert_eq!(
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161 script[3].instr,
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162 Instruction::DisplayText(0, 0, String::from("久々のお仕事だわ。"))
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163 );
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164 }
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165 }