From a320281e2dee2a1cd86383773d176c24548a39b1 Mon Sep 17 00:00:00 2001
From: Wesley Irvin <wesley@batesirvintech.net>
Date: Tue, 25 Apr 2023 14:43:40 -0400
Subject: [PATCH] WAD Loading

First run of WAD loading. Is able to read the header of the WAD
file.
---
 src/main.rs             | 17 +++++++++++++++-
 src/wadutils.rs         | 23 +++++++++++++++++++++
 src/wadutils/wadfile.rs | 45 +++++++++++++++++++++++++++++++++++++++++
 3 files changed, 84 insertions(+), 1 deletion(-)
 create mode 100644 src/wadutils.rs
 create mode 100644 src/wadutils/wadfile.rs

diff --git a/src/main.rs b/src/main.rs
index e7a11a9..4ac67e4 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,3 +1,18 @@
+mod wadutils;
+
 fn main() {
-    println!("Hello, world!");
+    let wad_file = wadutils::load_wad("WADs/doom1.wad");
+
+    println!(
+        "WAD Path: {}
+        
+Header:
+    Identifier: {}
+    Lump Count: {}
+    Initial Offset: {}",
+        wadutils::get_wad_path(&wad_file),
+        wadutils::get_wad_type(&wad_file),
+        wadutils::get_num_lumps(&wad_file),
+        wadutils::get_init_offset(&wad_file)
+    );
 }
diff --git a/src/wadutils.rs b/src/wadutils.rs
new file mode 100644
index 0000000..81fdc79
--- /dev/null
+++ b/src/wadutils.rs
@@ -0,0 +1,23 @@
+mod wadfile;
+
+use wadfile::WADFile;
+
+pub fn load_wad(path: &str) -> WADFile {
+    WADFile::from_path(path)
+}
+
+pub fn get_wad_path(wad_file: &WADFile) -> String {
+    wad_file.wad_path.to_string()
+}
+
+pub fn get_wad_type(wad_file: &WADFile) -> String {
+    wad_file.identifier.to_string()
+}
+
+pub fn get_num_lumps(wad_file: &WADFile) -> u32 {
+    wad_file.num_lumps
+}
+
+pub fn get_init_offset(wad_file: &WADFile) -> u32 {
+    wad_file.init_offset
+}
diff --git a/src/wadutils/wadfile.rs b/src/wadutils/wadfile.rs
new file mode 100644
index 0000000..a9a796b
--- /dev/null
+++ b/src/wadutils/wadfile.rs
@@ -0,0 +1,45 @@
+use std::{fs::File, io::Read};
+
+pub struct WADFile {
+    pub(super) wad_path: String,
+    pub(super) identifier: String,
+    pub(super) num_lumps: u32,
+    pub(super) init_offset: u32,
+}
+
+impl WADFile {
+    pub fn from_path(path: &str) -> Self {
+        let header_data = get_header_data(path);
+
+        Self {
+            wad_path: path.to_string(),
+            identifier: header_data.0,
+            num_lumps: header_data.1,
+            init_offset: header_data.2,
+        }
+    }
+}
+
+fn get_header_data(path: &str) -> (String, u32, u32) {
+    let mut wad_data = File::open(&path).unwrap();
+
+    let mut header = [0; 12];
+
+    wad_data.read(&mut header).unwrap();
+
+    let mut wad_type = String::with_capacity(4);
+
+    wad_type.push(header[0] as char);
+    wad_type.push(header[1] as char);
+    wad_type.push(header[2] as char);
+    wad_type.push(header[3] as char);
+
+    let lump_bytes: [u8; 4] = [header[4], header[5], header[6], header[7]];
+    let offset_bytes: [u8; 4] = [header[8], header[9], header[10], header[11]];
+
+    (
+        wad_type,
+        u32::from_le_bytes(lump_bytes),
+        u32::from_le_bytes(offset_bytes),
+    )
+}