CS2 - Read file header info

[ndorigatti]

Hello,
I'm opening a new issue related to CS2 replays. I take as reference the issue #321 where i've put the replay file.

Taking as a reference the project https://github.com/LaihoE/demoparser
I'm trying to get the header of this file in the same way is possible in the python project.

As a reference, in python is just:

header = parser.parse_header()
  print("** Map is: " + header["map_name"])
  print("** GUID is:" + header["demo_version_guid"])
  print("****** Last Tick Parsed ******")

I tryed to do in clarity the following:

     @OnMessage
    public void onMessage(Context ctx, GeneratedMessage message) {
        if (isHeader(message)) {
            logger.debug(message.toString());
            final Demo.CDemoFileHeader headers = (Demo.CDemoFileHeader) message;
            logger.info("********");
            logger.info("map name: {}", headers.getMapName());
            logger.info("Guid: {}", headers.getDemoVersionGuid());
            logger.info("Server start tick: {}", headers.getServerStartTick());
        }
//        log.info("{}", event.toString());
    }

And it works, but this way is an event "listener", is it possible to retrieve it programmatically on need?
Given
Demo.CDemoFileInfo info = Clarity.infoForFile(demofile);

the infoForFile does not retrieve it and i can't find any other way...

[spheenik]

@OnMessage(Demo.CDemoFilerHeader.class) does the trick.

[spheenik]

Regarding file info: It's not in there. It's a Dota-thing.

[spheenik]

Sorry for the long silence on this. Added `Clarity.headerForFile()` (and the matching `headerForStream()` / `headerForSource()` overloads) in 8042174..e05f2ef, mirroring the existing `infoForFile()` pattern:

```java
Demo.CDemoFileHeader header = Clarity.headerForFile("path/to/replay.dem");
System.out.println(header.getMapName());
System.out.println(header.getDemoVersionGuid());
System.out.println(header.getServerStartTick());
```

The header was actually already being read during `source.determineEngineType()` — this just exposes it through a public accessor on `EngineType` and wraps it in a static helper, so there's no extra parsing pass.

Supported for Dota S1, Dota S2, CSGO S2 (CS2) and Deadlock — anything that produces a `Demo.CDemoFileHeader`. CSGO Source 1 demos use a different header type (`CsGoDemoHeader`) and will throw `IOException` with an explanatory message; CSGO S1 is effectively dead, so the conversion isn't worth the maintenance overhead.

A matching example is in clarity-examples/header.

Will be in clarity 3.1.4. Closing.