Wad stuff is coming along slowly

src/wad.rs

@@ -1,21 +1,67 @@
-use std::path::PathBuf;
-use std::fs::File;
-use std::io::{BufReader, Seek, SeekFrom};
 use bincode;
 use serde::Deserialize;
+use std::fs::File;
+use std::io::{BufReader, Seek, SeekFrom};
+use std::path::PathBuf;
 
+/*
+A great document I've used as a reference is The Unofficial Doom Specs v1.666
+https://www.gamers.org/dhs/helpdocs/dmsp1666.html
+
+References in comments are probably to this document
+*/
+
+// See Chapter 2
 #[derive(Deserialize, Debug)]
 pub struct WadHeader {
     pub identifier: [u8; 4],
     pub num_lumps: i32,
     pub file_offset_to_start: i32,
 }
+// See Chapter 2
+#[derive(Deserialize, Debug)]
+pub struct WadLumpDirectoryEntry {
+    pub offset: i32,
+    pub size: i32,
+    pub name: [u8; 8],
+}
+
+pub struct NiceWadLumpEntry {
+    pub offset: i32,
+    pub size: i32,
+    pub name: String,
+}
 
 pub fn open_wad(path: &PathBuf) -> WadHeader {
     let mut file = BufReader::new(File::open(path).unwrap());
     let header: WadHeader = bincode::deserialize_from(&mut file).unwrap();
-    file.seek(SeekFrom::Start(header.file_offset_to_start as u64)).unwrap();
-
+    file.seek(SeekFrom::Start(header.file_offset_to_start as u64))
+        .unwrap();
+    let mut lumps: Vec<WadLumpDirectoryEntry> = Vec::new();
+    let mut nice_lumps: Vec<NiceWadLumpEntry> = Vec::new();
+    let mut levels = Vec::new();
+    for lump_num in 0..header.num_lumps {
+        let lump: WadLumpDirectoryEntry = bincode::deserialize_from(&mut file).unwrap();
+        let nice_lump = NiceWadLumpEntry {
+            offset: lump.offset,
+            size: lump.size,
+            name: std::str::from_utf8(&lump.name).unwrap().to_string(),
+        };
+        // I stole this from rust-doom. I looked up idSoftware Linux Doom, but they searched
+        // for the strings "map%d" or ExMy - I'm not 100% sure, but I bet many PWADs don't
+        // neccesarily use this... I do think that probably PWADs provide different THINGS
+        // for their maps - I don't know how you wouldn't - what I'm not 100% sure about is
+        // whether the map reference is _always_ before the THINGS. Might have to try
+        // with some WADs to check
+        if &lump.name == b"THINGS\0\0" {
+            levels.push((lump_num - 1) as usize);
+        }
+        lumps.push(lump);
+        nice_lumps.push(nice_lump);
+    }
+    for lump in nice_lumps {
+        println!("{}", lump.name);
+    }
     header
 }
 
@@ -26,9 +72,31 @@ mod tests {
     #[test]
     fn test_open_wad() {
         let freedoom_iwad = PathBuf::from("freedoom1.wad");
-        assert!(freedoom_iwad.exists(), "Needs freedoom1.wad - get it from here https://freedoom.github.io"); 
+        assert!(
+            freedoom_iwad.exists(),
+            "WAD test need freedoom1.wad - get it from here https://freedoom.github.io"
+        );
         let ow = open_wad(&freedoom_iwad);
         assert_eq!(&ow.identifier, b"IWAD");
         assert_eq!(std::str::from_utf8(&ow.identifier).unwrap(), "IWAD");
     }
+
+    #[test]
+    fn test_failed() {
+        let freedoom_iwad = PathBuf::from("freedoom1.wad");
+        assert!(
+            freedoom_iwad.exists(),
+            "WAD test need freedoom1.wad - get it from here https://freedoom.github.io"
+        );
+        let ow = open_wad(&freedoom_iwad);
+        panic!();
+    }
+
+    #[test]
+    fn test_struct_size() {
+        // This probably isn't really neccesary... but it might catch a mistake, maybe?
+        // These shouldn't compile if the size is incorrect (I think)
+        const _HS: [u8; 12] = [0; std::mem::size_of::<WadHeader>()];
+        const _LDS: [u8; 16] = [0; std::mem::size_of::<WadLumpDirectoryEntry>()];
+    }
 }