From 0b340abb20a6cbc2016c9760d24bbb63d28f45f2 Mon Sep 17 00:00:00 2001
From: jaby <jaby@william.zone>
Date: Tue, 6 Aug 2024 12:58:31 -0500
Subject: [PATCH] Parse VAG header

---
 include/PSX/Auxiliary/big_endian.hpp          | 19 ++++++++++
 .../src/File/Processor/vag_processor.cpp      | 35 +++++++++++++++++--
 2 files changed, 52 insertions(+), 2 deletions(-)
 create mode 100644 include/PSX/Auxiliary/big_endian.hpp

diff --git a/include/PSX/Auxiliary/big_endian.hpp b/include/PSX/Auxiliary/big_endian.hpp
new file mode 100644
index 00000000..4e24c32b
--- /dev/null
+++ b/include/PSX/Auxiliary/big_endian.hpp
@@ -0,0 +1,19 @@
+#pragma once
+#include "../jabyengine_defines.hpp"
+
+namespace JabyEngine {
+    // Taken from boost endian
+
+    static constexpr uint8_t read_be(uint8_t x) {
+        return x;
+    }
+
+    static constexpr uint16_t read_be(uint16_t x) {
+        return (x << 8) | (x >> 8);
+    }
+
+    static constexpr uint32_t read_be(uint32_t x) {
+        const uint32_t step16 = x << 16 | x >> 16;
+        return ((step16 << 8) & 0xff00ff00) | ((step16 >> 8) & 0x00ff00ff);
+    }
+}
\ No newline at end of file
diff --git a/src/Library/src/File/Processor/vag_processor.cpp b/src/Library/src/File/Processor/vag_processor.cpp
index 55330468..2966a4f2 100644
--- a/src/Library/src/File/Processor/vag_processor.cpp
+++ b/src/Library/src/File/Processor/vag_processor.cpp
@@ -1,9 +1,34 @@
+#include <PSX/Auxiliary/big_endian.hpp>
 #include <PSX/File/file_processor_helper.hpp>
 #include <stdio.hpp>
 
 #ifdef __SUPPORT_VAG__
 namespace JabyEngine {
     namespace FileProcessor {
+        #pragma pack(push, 1)
+        struct VAGHeader {
+            char     id[4];
+            uint32_t version;
+            uint32_t reserved;
+            uint32_t sample_size;
+            uint32_t sample_frequency;
+            uint8_t  reserved_2[12];
+            char     name[16];
+
+            constexpr uint32_t get_version() const {
+                return read_be(this->version);
+            }
+
+            constexpr uint32_t get_sample_size() const {
+                return read_be(this->sample_size);
+            }
+
+            constexpr uint32_t get_sample_frequency() const {
+                return read_be(this->sample_frequency);
+            }
+        };
+        #pragma pack(pop)
+
         struct VAGState {
             static constexpr VAGState create() {
                 return VAGState{};
@@ -11,8 +36,14 @@ namespace JabyEngine {
         };
 
         static Progress parse_header(State::Configuration& config, VAGState& state) {
-            printf("What am I supposed to do?!\n");
-            return Progress::Error;
+            if(config.data_bytes >= sizeof(VAGHeader)) {
+                const auto& header = *reinterpret_cast<const VAGHeader*>(config.data_adr);
+
+                printf("VAG-ID: %s\nName: %s\nSample size: %i\nSample rate: %i\n", header.id, header.name, header.get_sample_size(), header.get_sample_frequency());
+                return Progress::Error;
+            }
+
+            return Progress::InProgress;
         }
 
         State create(const uint32_t* data_adr, const VAG& file) {