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Dota 2 / Deadlock / CS2 replay parser written in Rust

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# source2-demo

[![Crates.io](https://img.shields.io/crates/v/source2-demo)](https://crates.io/crates/source2-demo)
[![Documentation](https://img.shields.io/docsrs/source2-demo)](https://docs.rs/source2-demo)
[![License](https://img.shields.io/crates/l/source2-demo)](https://github.com/Rupas1k/source2-demo)

`source2-demo` is a Rust library for parsing Source 2 engine demo files.

## Supported Games

- Dota 2
- Deadlock
- Counter-Strike 2

## Installation

Add the following to your `Cargo.toml` and enable the feature for the game you want to parse:

```toml
[dependencies]
# For Dota 2
source2-demo = { version = "0.5", features = ["dota"] }

# For Deadlock
# source2-demo = { version = "0.5", features = ["deadlock"] }

# For Counter-Strike 2
# source2-demo = { version = "0.5", features = ["cs2"] }
```

## Quick Start: Parsing Chat Messages

Here's a simple program that prints chat messages from a Dota 2 replay. It handles the `CDotaUserMsgChatMessage` protobuf message and prints the player's name and their message.

More examples can be found in the `d2-examples` and `dl-examples` directories.

```rust ignore
use source2_demo::prelude::*;
use source2_demo::proto::*;
use std::fs::File;
use std::io::BufReader;

// Create a struct that implements the Default trait
#[derive(Default)]
struct Chat;

// Mark the impl block with the observer attribute
#[observer]
#[uses_all]
impl Chat {
    // Use the on_message attribute to mark the protobuf message handler
    #[on_message]
    fn handle_chat_msg(
        &mut self,
        ctx: &Context,
        chat_msg: CDotaUserMsgChatMessage, // Use any protobuf message as an argument
    ) -> ObserverResult {
        if let Ok(pr) = ctx.entities().get_by_class_name("CDOTA_PlayerResource") {
            let name: String = property!(
                pr,
                "m_vecPlayerData.{:04}.m_iszPlayerName",
                chat_msg.source_player_id()
            );
            println!("{}: {}", name, chat_msg.message_text());
        }
        Ok(())
    }
}

fn main() -> Result<(), Box<dyn std::error::Error>> {
    // Create a parser
    let input = BufReader::new(File::open("replay.dem")?);
    let mut parser = Parser::from_reader(input)?;

// Register observers
    parser.register_observer::<Chat>();

// Run the parser
    parser.run_to_end()?;

Ok(())
}
```

## Quick Start: Rewriting Protobuf Messages

Use `source2_demo::writer` when you want to write a modified demo. The writer
parses the input replay, applies registered rewriters, and writes a new replay
stream to the output.

This example removes Dota 2 chat messages by rewriting a protobuf packet message:

```rust ignore
use source2_demo::prelude::*;
use source2_demo::proto::CDotaUserMsgChatMessage;
use source2_demo::writer::*;
use std::fs::File;
use std::io::{BufReader, BufWriter};

#[derive(Default)]
struct RemoveChat;

#[rewriter]
impl RemoveChat {
    #[rewrite_packet_message]
    fn remove_chat(
        &mut self,
        _message: CDotaUserMsgChatMessage,
    ) -> Result<MessageRewrite, ParserError> {
        Ok(MessageRewrite::Drop)
    }
}

fn main() -> anyhow::Result<()> {
    let input = BufReader::new(File::open("input.dem")?);
    let output = BufWriter::new(File::create("output.dem")?);

let mut writer = DemoWriter::from_reader(input, output)?;
    writer.register_rewriter::<RemoveChat>();
    writer.run()?;

Ok(())
}
```

## Quick Start: Rewriting Fields and String Tables

This Deadlock example anonymizes a replay by rewriting entity fields, a packet message,
and userinfo entries in string tables. The full example is in `dl-examples/anonymize-replay`.

```rust ignore
use source2_demo::prelude::*;
use source2_demo::proto::{
    CCitadelUserMsgPostMatchDetails, CMsgMatchMetaDataContents, CMsgPlayerInfo,
};
use source2_demo::writer::*;

#[derive(Default)]
struct ReplayAnonymizer;

#[rewriter]
impl ReplayAnonymizer {
    #[rewrite_field(class = "CCitadelPlayerController", field = "m_steamID")]
    fn remove_steam_id(&mut self, _value: u64) -> u64 {
        0
    }

#[rewrite_packet_message]
    fn remove_post_match_details(
        &mut self,
        message: &mut CCitadelUserMsgPostMatchDetails,
    ) -> Result<MessageRewrite, ParserError> {
        if let Some(match_details) = message.match_details.as_mut() {
            let mut metadata = CMsgMatchMetaDataContents::decode(match_details.as_slice())?;
            if let Some(match_info) = metadata.match_info.as_mut() {
                match_info.match_id = Some(0);
                for player in &mut match_info.players {
                    player.account_id = Some(0);
                }
            }
            *match_details = metadata.encode_to_vec();
        }
        Ok(MessageRewrite::Rewrite)
    }

#[rewrite_string_table_entry]
    fn remove_userinfo(
        &mut self,
        table_name: &str,
        entry: &mut StringTableEntryUpdate,
    ) -> Result<(), ParserError> {
        if table_name == "userinfo" {
            if let Some(value) = entry.value_mut() {
                let mut player = CMsgPlayerInfo::decode(value.as_slice())?;
                player.name = Some("Anonymous".to_string());
                player.xuid = Some(0);
                player.steamid = Some(0);
                *value = player.encode_to_vec();
            }
        }
        Ok(())
    }
}
```

## Building Examples

To build the examples, clone the repository and use Cargo:

```shell
git clone https://github.com/Rupas1k/source2-demo
cd source2-demo

# Build examples for a specific game
cd dl-examples # d2-examples
cargo build --release
```

### Run a Specific Example

```shell
cargo run --release -p example input.dem
cargo run --release -p example input.dem output.dem
```

## Projects Using source2-demo

- [Dota 2 Replay Anonymizer](https://github.com/Rupas1k/dota2-replay-anonymizer) - CLI and browser app for anonymizing Dota 2 replays.

## Features

The crate supports the following cargo features:

- **`dota`** - Enable Dota 2 replay parsing (includes Dota 2 protobufs)
- **`deadlock`** - Enable Deadlock replay parsing (includes Citadel protobufs)
- **`cs2`** - Enable Counter-Strike 2 replay parsing (includes CS2 protobufs)
- **`unsafe`** - Disable bounds checking in the reader for improved performance.
- **`mimalloc`** (default) - Use mimalloc as the global allocator for improved performance

You can enable multiple game features if needed:

```toml
source2-demo = { version = "*", features = ["dota", "cs2"] }
```

You can disable mimalloc if it causes issues on your platform (e.g., WebAssembly):

```toml
source2-demo = { version = "*", default-features = false }
```

## Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

## Credits

This project was inspired by and builds upon the work of other Source 2 demo parsers:

- [clarity](https://github.com/skadistats/clarity) - Java-based Source 2 replay parser
- [manta](https://github.com/dotabuff/manta) - Go-based Dota 2 replay parser

## License

This project is dual-licensed under either:

- Apache License, Version 2.0 ([LICENSE-APACHE](LICENSE-APACHE) or <http://www.apache.org/licenses/LICENSE-2.0>)
- MIT License ([LICENSE-MIT](LICENSE-MIT) or <http://opensource.org/licenses/MIT>)

at your option.

### Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.

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