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annotate src/th06/std.rs @ 712:13fd434d5d1b

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std: Split parser to simplify parsing.
author Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
date Tue, 17 Sep 2019 16:46:10 +0200
parents 377c241be559
children fc937d93a57c
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rev   line source
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1 //! STD background format support.
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2
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3 use nom::{
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4 IResult,
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5 bytes::complete::tag,
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6 number::complete::{le_u8, le_u16, le_u32, le_i32, le_f32},
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7 sequence::tuple,
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8 combinator::map,
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9 multi::{many0, count},
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10 error::ErrorKind,
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11 Err,
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12 };
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13 use encoding_rs::SHIFT_JIS;
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14
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15 /// A float position in the 3D space.
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16 #[derive(Debug, Clone)]
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17 pub struct Position {
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18 /// X component.
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19 pub x: f32,
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20
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21 /// Y component.
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22 pub y: f32,
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23
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24 /// Z component.
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25 pub z: f32,
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26 }
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27
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28 /// A 3D box around something.
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29 #[derive(Debug, Clone)]
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30 struct Box3D {
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31 width: f32,
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32 height: f32,
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33 depth: f32,
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34 }
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35
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36 /// A 2D box around something.
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37 #[derive(Debug, Clone)]
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38 pub struct Box2D {
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39 /// Width.
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40 pub width: f32,
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41
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42 /// Height.
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43 pub height: f32,
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44 }
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45
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46 /// A quad in the 3D space.
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47 #[derive(Debug, Clone)]
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48 pub struct Quad {
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49 /// The anm script to run for this quad.
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50 pub anm_script: u16,
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51
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52 /// The position of this quad in the 3D space.
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53 pub pos: Position,
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54
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55 /// The size of this quad.
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56 pub size_override: Box2D,
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57 }
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58
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59 /// A model formed of multiple quads in space.
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60 #[derive(Debug, Clone)]
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61 pub struct Model {
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62 /// TODO: find what that is.
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63 pub unknown: u16,
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64
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65 /// The bounding box around this model.
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66 pub bounding_box: [f32; 6],
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67
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68 /// The quads composing this model.
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69 pub quads: Vec<Quad>,
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70 }
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71
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72 /// An instance of a model.
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73 #[derive(Debug, Clone)]
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74 pub struct Instance {
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75 /// The instance identifier.
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76 pub id: u16,
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77
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78 /// Where to position the instance of this model.
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79 pub pos: Position,
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80 }
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81
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82 /// A single instruction, part of a `Script`.
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83 #[derive(Debug, Clone)]
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84 pub struct Call {
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85 /// Time at which this instruction will be called.
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86 pub time: u32,
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87
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88 /// The instruction to call.
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89 pub instr: Instruction,
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90 }
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91
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92 /// Parse a SHIFT_JIS byte string of length 128 into a String.
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93 #[allow(non_snake_case)]
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94 pub fn le_String(i: &[u8]) -> IResult<&[u8], String> {
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95 let data = i.splitn(2, |c| *c == b'\0').nth(0).unwrap();
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96 let (string, _encoding, _replaced) = SHIFT_JIS.decode(data);
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97 Ok((&i[128..], string.into_owned()))
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98 }
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99
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100 /// Main struct of the STD stage format.
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101 #[derive(Debug, Clone)]
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102 pub struct Stage {
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103 /// The name of the stage.
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104 pub name: String,
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105
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106 /// A list of (name, path) of background music.
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107 // TODO: there are maximum four of them, and in practice never more than 2.
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108 pub musics: Vec<Option<(String, String)>>,
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109
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110 /// List of models.
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111 pub models: Vec<Model>,
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112
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113 /// List of instances.
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114 pub instances: Vec<Instance>,
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115
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116 /// List of instructions in the script.
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117 pub script: Vec<Call>,
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118 }
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119
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120 impl Stage {
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121 /// Parse a slice of bytes into an `Stage` struct.
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122 pub fn from_slice(data: &[u8]) -> IResult<&[u8], Stage> {
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123 parse_stage(data)
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124 }
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125 }
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126
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127 macro_rules! declare_stage_instructions {
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128 ($($opcode:tt => fn $name:ident($($arg:ident: $arg_type:ident),*)),*,) => {
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129 /// Available instructions in an `Stage`.
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130 #[allow(missing_docs)]
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131 #[derive(Debug, Clone, Copy)]
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132 pub enum Instruction {
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133 $(
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134 $name($($arg_type),*)
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135 ),*
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136 }
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137
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138 fn parse_instruction_args(input: &[u8], opcode: u16) -> IResult<&[u8], Instruction> {
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139 let mut i = &input[..];
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140 let instr = match opcode {
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141 $(
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142 $opcode => {
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143 $(
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144 let (i2, $arg) = concat_idents!(le_, $arg_type)(i)?;
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145 i = i2;
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146 )*
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147 Instruction::$name($($arg),*)
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148 }
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149 )*
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150 _ => unreachable!()
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151 };
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152 Ok((i, instr))
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153 }
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154 };
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155 }
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156
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157 declare_stage_instructions!{
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158 0 => fn SetViewpos(x: f32, y: f32, z: f32),
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159 1 => fn SetFog(r: u8, g: u8, b: u8, a: u8, near: f32, far: f32),
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160 2 => fn SetViewpos2(x: f32, y: f32, z: f32),
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161 3 => fn StartInterpolatingViewpos2(frame: u32, _unused: i32, _unused: i32),
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162 4 => fn StartInterpolatingFog(frame: u32, _unused: i32, _unused: i32),
671
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163 5 => fn Unknown(_unused: i32, _unused: i32, _unused: i32),
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164 }
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165
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166 fn parse_quad(i: &[u8]) -> IResult<&[u8], Quad> {
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167 let (i, (unk1, size)) = tuple((le_u16, le_u16))(i)?;
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168 if unk1 == 0xffff {
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169 return Err(Err::Error((i, ErrorKind::Eof)));
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170 }
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171 // TODO: replace this assert with a custom error.
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172 assert_eq!(size, 0x1c);
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173 let (i, (anm_script, _, x, y, z, width, height)) = tuple((le_u16, tag(b"\0\0"), le_f32, le_f32, le_f32, le_f32, le_f32))(i)?;
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174 let quad = Quad {
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175 anm_script,
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176 pos: Position { x, y, z },
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177 size_override: Box2D { width, height },
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178 };
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179 Ok((i, quad))
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180 }
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181
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182 fn parse_model(i: &[u8]) -> IResult<&[u8], Model> {
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183 let (i, (_id, unknown, x, y, z, width, height, depth, quads)) = tuple((le_u16, le_u16, le_f32, le_f32, le_f32, le_f32, le_f32, le_f32, many0(parse_quad)))(i)?;
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184 let bounding_box = [x, y, z, width, height, depth];
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185 let model = Model {
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186 unknown,
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187 bounding_box,
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188 quads,
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189 };
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190 Ok((i, model))
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191 }
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192
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193 fn parse_instance(i: &[u8]) -> IResult<&[u8], Instance> {
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194 let (i, (id, unknown, x, y, z)) = tuple((le_u16, le_u16, le_f32, le_f32, le_f32))(i)?;
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195 if id == 0xffff && unknown == 0xffff {
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196 return Err(Err::Error((i, ErrorKind::Eof)));
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197 }
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198 // TODO: replace this assert with a custom error.
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199 assert_eq!(unknown, 0x100);
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200 let instance = Instance {
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201 id,
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202 pos: Position { x, y, z },
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203 };
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204 Ok((i, instance))
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205 }
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206
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207 fn parse_instruction(i: &[u8]) -> IResult<&[u8], Call> {
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208 let (i, (time, opcode, size)) = tuple((le_u32, le_u16, le_u16))(i)?;
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209 if time == 0xffffffff && opcode == 0xffff && size == 0xffff {
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210 return Err(Err::Error((i, ErrorKind::Eof)));
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211 }
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212 // TODO: replace this assert with a custom error.
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213 assert_eq!(size, 12);
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214 let (i, instr) = parse_instruction_args(i, opcode)?;
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215 println!("{} {:?}", time, instr);
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216 let call = Call { time, instr };
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217 Ok((i, call))
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218 }
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219
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220 fn parse_stage(input: &[u8]) -> IResult<&[u8], Stage> {
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221 let i = &input[..];
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222
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223 let (i, (num_models, _num_faces, object_instances_offset, script_offset, _, name, music_names, music_paths)) = tuple((
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224 le_u16, le_u16, le_u32, le_u32, tag(b"\0\0\0\0"),
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225 le_String,
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226 map(tuple((le_String, le_String, le_String, le_String)), |(a, b, c, d)| [a, b, c, d]),
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227 map(tuple((le_String, le_String, le_String, le_String)), |(a, b, c, d)| [a, b, c, d])
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228 ))(i)?;
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229 let musics = music_names.iter().zip(&music_paths).map(|(name, path)| if name == " " { None } else { Some((name.clone(), path.clone())) }).collect();
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230
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231 let (_, offsets) = count(le_u32, num_models as usize)(i)?;
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232
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233 let mut models = vec![];
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234 for offset in offsets {
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235 let (_, model) = parse_model(&input[offset as usize..])?;
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236 models.push(model);
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237 }
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238
712
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239 let (_, instances) = many0(parse_instance)(&input[object_instances_offset as usize..])?;
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240 let (_, script) = many0(parse_instruction)(&input[script_offset as usize..])?;
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241
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242 let stage = Stage {
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243 name,
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244 musics,
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245 models,
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246 instances,
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247 script,
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248 };
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249 Ok((b"", stage))
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250 }
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251
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252 #[cfg(test)]
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253 mod tests {
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254 use super::*;
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255 use std::io::{self, Read};
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256 use std::fs::File;
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257
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258 #[test]
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259 fn std() {
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260 let file = File::open("EoSD/ST/stage1.std").unwrap();
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261 let mut file = io::BufReader::new(file);
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262 let mut buf = vec![];
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263 file.read_to_end(&mut buf).unwrap();
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264 let (_, stage) = Stage::from_slice(&buf).unwrap();
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265 assert_eq!(stage.name, "夢幻夜行絵巻　～ Mystic Flier");
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266 assert_eq!(stage.musics.len(), 4);
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267 assert_eq!(stage.models.len(), 13);
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268 assert_eq!(stage.instances.len(), 90);
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269 assert_eq!(stage.script.len(), 21);
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270 }
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271 }