dem 0.2.3

GoldSrc demo parser and writer library
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286

use std::{ffi::OsStr, fs::OpenOptions, io::Write, path::Path};

use crate::{
    byte_writer::ByteWriter,
    types::{Demo, FrameData, MessageData, NetworkMessageType},
};

impl Demo {
    pub fn write_to_file(&self, path: impl AsRef<OsStr> + AsRef<Path>) -> eyre::Result<()> {
        let mut file = OpenOptions::new()
            .create(true)
            .write(true)
            .truncate(true)
            .open(path)?;

        file.write_all(self.write_to_bytes().as_slice())?;
        file.flush()?;

        Ok(())
    }

    pub fn write_to_bytes(&self) -> Vec<u8> {
        let mut writer = ByteWriter::new();

        // Magic has 8 bytes in total
        writer.append_u8_slice("HLDEMO\x00\x00".as_bytes());

        // header
        writer.append_i32(self.header.demo_protocol);
        writer.append_i32(self.header.network_protocol);
        writer.append_u8_slice(self.header.map_name.padded(260).as_slice());
        writer.append_u8_slice(self.header.game_directory.padded(260).as_slice());
        writer.append_u32(self.header.map_checksum);

        // directory
        // Delay writing directory offset
        let directory_offset_pos = writer.get_offset();
        writer.append_i32(0i32);

        let mut entry_offsets: Vec<(usize, usize)> = vec![];

        for entry in &self.directory.entries {
            let mut has_written_next_section = false;

            let entry_offset_start = writer.get_offset();

            for frame in &entry.frames {
                match frame.frame_data {
                    FrameData::DemoStart => writer.append_u8(2u8),
                    FrameData::ConsoleCommand(_) => writer.append_u8(3u8),
                    FrameData::ClientData(_) => writer.append_u8(4u8),
                    FrameData::NextSection => writer.append_u8(5u8),
                    FrameData::Event(_) => writer.append_u8(6u8),
                    FrameData::WeaponAnimation(_) => writer.append_u8(7u8),
                    FrameData::Sound(_) => writer.append_u8(8u8),
                    FrameData::DemoBuffer(_) => writer.append_u8(9u8),
                    FrameData::NetworkMessage(ref box_type) => match box_type.as_ref().0 {
                        NetworkMessageType::Start => writer.append_u8(0u8),
                        NetworkMessageType::Normal => writer.append_u8(1u8),
                        NetworkMessageType::Unknown(what) => writer.append_u8(what),
                    },
                }

                writer.append_f32(frame.time);
                writer.append_i32(frame.frame);

                // write the frame
                match &frame.frame_data {
                    FrameData::DemoStart => (),
                    FrameData::ConsoleCommand(frame) => {
                        writer.append_u8_slice(frame.command.padded(64).as_slice())
                    }
                    FrameData::ClientData(frame) => {
                        writer.append_f32_slice(frame.origin.as_slice());
                        writer.append_f32_slice(frame.viewangles.as_slice());
                        writer.append_i32(frame.weapon_bits);
                        writer.append_f32(frame.fov);
                    }
                    FrameData::NextSection => (),
                    FrameData::Event(frame) => {
                        writer.append_i32(frame.flags);
                        writer.append_i32(frame.index);
                        writer.append_f32(frame.delay);

                        writer.append_i32(frame.args.flags);
                        writer.append_i32(frame.args.entity_index);
                        writer.append_f32_slice(frame.args.origin.as_slice());
                        writer.append_f32_slice(frame.args.angles.as_slice());
                        writer.append_f32_slice(frame.args.velocity.as_slice());
                        writer.append_i32(frame.args.ducking);
                        writer.append_f32(frame.args.fparam1);
                        writer.append_f32(frame.args.fparam2);
                        writer.append_i32(frame.args.iparam1);
                        writer.append_i32(frame.args.iparam2);
                        writer.append_i32(frame.args.bparam1);
                        writer.append_i32(frame.args.bparam2);
                    }
                    FrameData::WeaponAnimation(frame) => {
                        writer.append_i32(frame.anim);
                        writer.append_i32(frame.body);
                    }
                    FrameData::Sound(frame) => {
                        writer.append_i32(frame.channel);
                        writer.append_i32(frame.sample.len() as i32);
                        writer.append_u8_slice(frame.sample.as_slice());
                        writer.append_f32(frame.attenuation);
                        writer.append_f32(frame.volume);
                        writer.append_i32(frame.flags);
                        writer.append_i32(frame.pitch);
                    }
                    FrameData::DemoBuffer(frame) => {
                        writer.append_i32(frame.buffer.len() as i32);
                        writer.append_u8_slice(frame.buffer.as_slice());
                    }
                    FrameData::NetworkMessage(ref box_type) => {
                        let data = &box_type.as_ref().1;

                        writer.append_f32(data.info.timestamp);
                        // ref_params
                        writer.append_f32_slice(data.info.refparams.view_origin.as_slice());
                        writer.append_f32_slice(data.info.refparams.view_angles.as_slice());
                        writer.append_f32_slice(data.info.refparams.forward.as_slice());
                        writer.append_f32_slice(data.info.refparams.right.as_slice());
                        writer.append_f32_slice(data.info.refparams.up.as_slice());
                        writer.append_f32(data.info.refparams.frame_time);
                        writer.append_f32(data.info.refparams.time);
                        writer.append_i32(data.info.refparams.intermission);
                        writer.append_i32(data.info.refparams.paused);
                        writer.append_i32(data.info.refparams.spectator);
                        writer.append_i32(data.info.refparams.on_ground);
                        writer.append_i32(data.info.refparams.water_level);
                        writer.append_f32_slice(data.info.refparams.sim_vel.as_slice());
                        writer.append_f32_slice(data.info.refparams.sim_org.as_slice());
                        writer.append_f32_slice(data.info.refparams.view_height.as_slice());
                        writer.append_f32(data.info.refparams.ideal_pitch);
                        writer.append_f32_slice(data.info.refparams.cl_viewangles.as_slice());
                        writer.append_i32(data.info.refparams.health);
                        writer.append_f32_slice(data.info.refparams.crosshair_angle.as_slice());
                        writer.append_f32(data.info.refparams.view_size);
                        writer.append_f32_slice(data.info.refparams.punch_angle.as_slice());
                        writer.append_i32(data.info.refparams.max_clients);
                        writer.append_i32(data.info.refparams.view_entity);
                        writer.append_i32(data.info.refparams.player_num);
                        writer.append_i32(data.info.refparams.max_entities);
                        writer.append_i32(data.info.refparams.demo_playback);
                        writer.append_i32(data.info.refparams.hardware);
                        writer.append_i32(data.info.refparams.smoothing);
                        writer.append_i32(data.info.refparams.ptr_cmd);
                        writer.append_i32(data.info.refparams.ptr_move_vars);
                        writer.append_i32_slice(data.info.refparams.view_port.as_slice());
                        writer.append_i32(data.info.refparams.next_view);
                        writer.append_i32(data.info.refparams.only_client_draw);
                        // usercmd
                        writer.append_i16(data.info.usercmd.lerp_msec);
                        writer.append_u8(data.info.usercmd.msec);
                        writer.append_u8(0u8); // unknown
                        writer.append_f32_slice(data.info.usercmd.view_angles.as_slice());
                        writer.append_f32(data.info.usercmd.forward_move);
                        writer.append_f32(data.info.usercmd.side_move);
                        writer.append_f32(data.info.usercmd.up_move);
                        writer.append_i8(data.info.usercmd.light_level);
                        writer.append_u8(0u8); // unknown
                        writer.append_u16(data.info.usercmd.buttons);
                        writer.append_i8(data.info.usercmd.impulse);
                        writer.append_i8(data.info.usercmd.weapon_select);
                        writer.append_u8(0u8); // unknown
                        writer.append_u8(0u8); // unknown
                        writer.append_i32(data.info.usercmd.impact_index);
                        writer.append_f32_slice(data.info.usercmd.impact_position.as_slice());
                        // movevars
                        writer.append_f32(data.info.movevars.gravity);
                        writer.append_f32(data.info.movevars.stopspeed);
                        writer.append_f32(data.info.movevars.maxspeed);
                        writer.append_f32(data.info.movevars.spectatormaxspeed);
                        writer.append_f32(data.info.movevars.accelerate);
                        writer.append_f32(data.info.movevars.airaccelerate);
                        writer.append_f32(data.info.movevars.wateraccelerate);
                        writer.append_f32(data.info.movevars.friction);
                        writer.append_f32(data.info.movevars.edgefriction);
                        writer.append_f32(data.info.movevars.waterfriction);
                        writer.append_f32(data.info.movevars.entgravity);
                        writer.append_f32(data.info.movevars.bounce);
                        writer.append_f32(data.info.movevars.stepsize);
                        writer.append_f32(data.info.movevars.maxvelocity);
                        writer.append_f32(data.info.movevars.zmax);
                        writer.append_f32(data.info.movevars.wave_height);
                        writer.append_i32(data.info.movevars.footsteps);
                        writer.append_u8_slice(data.info.movevars.sky_name.padded(32).as_slice());
                        writer.append_f32(data.info.movevars.rollangle);
                        writer.append_f32(data.info.movevars.rollspeed);
                        writer.append_f32(data.info.movevars.skycolor[0]);
                        writer.append_f32(data.info.movevars.skycolor[1]);
                        writer.append_f32(data.info.movevars.skycolor[2]);
                        writer.append_f32(data.info.movevars.skyvec[0]);
                        writer.append_f32(data.info.movevars.skyvec[1]);
                        writer.append_f32(data.info.movevars.skyvec[2]);
                        // still in info
                        writer.append_f32_slice(data.info.view.as_slice());
                        writer.append_i32(data.info.viewmodel);
                        // now other data
                        writer.append_i32(data.sequence_info.incoming_sequence);
                        writer.append_i32(data.sequence_info.incoming_acknowledged);
                        writer.append_i32(data.sequence_info.incoming_reliable_acknowledged);
                        writer.append_i32(data.sequence_info.incoming_reliable_sequence);
                        writer.append_i32(data.sequence_info.outgoing_sequence);
                        writer.append_i32(data.sequence_info.reliable_sequence);
                        writer.append_i32(data.sequence_info.last_reliable_sequence);

                        // write the frame itself
                        match &data.messages {
                            MessageData::Parsed(vec) => {
                                // delay writing message length
                                let start_offset_value = writer.get_offset();
                                writer.append_u32(0);

                                let start_length = writer.get_offset();

                                for message in vec {
                                    writer.append_u8_slice(
                                        message
                                            .write(self._aux.as_ref().unwrap().clone())
                                            .as_slice(),
                                    );
                                }

                                let end_length = writer.get_offset();

                                // this should be a function, wtf
                                writer.data.splice(
                                    start_offset_value..start_offset_value + 4,
                                    ((end_length - start_length) as u32).to_le_bytes(),
                                );
                            }
                            MessageData::Raw(vec) => {
                                writer.append_i32(vec.len() as i32);
                                writer.append_u8_slice(vec.as_slice());
                            }
                            MessageData::None => {
                                // length
                                writer.append_i32(0);
                            }
                        }
                    }
                }

                if matches!(frame.frame_data, FrameData::NextSection) {
                    has_written_next_section = true;
                }
            }

            if !has_written_next_section {
                writer.append_u8(5u8);
                writer.append_f32(0.);
                writer.append_i32(0);
            }

            entry_offsets.push((entry_offset_start, writer.get_offset()));
        }

        // writing the directory entry at the end because now we have the offset
        let directory_offset = writer.get_offset();

        writer.append_i32(self.directory.entries.len() as i32);

        for (entry, (offset_start, offset_end)) in
            self.directory.entries.iter().zip(entry_offsets.iter())
        {
            writer.append_i32(entry.type_);
            writer.append_u8_slice(entry.description.padded(64).as_slice());
            writer.append_i32(entry.flags);
            writer.append_i32(entry.cd_track);
            writer.append_f32(entry.track_time);

            writer.append_i32(entry.frames.len() as i32);
            writer.append_i32(*offset_start as i32);
            writer.append_i32((offset_end - offset_start) as i32);
        }

        writer.data.splice(
            directory_offset_pos..directory_offset_pos + 4,
            (directory_offset as u32).to_le_bytes(),
        );

        writer.data
    }
}