From 07318256e0883901e2a0d5bc37b247a2ffab03d5 Mon Sep 17 00:00:00 2001
From: Gwilym Inzani <gw@ilym.me>
Date: Thu, 6 Apr 2023 23:09:19 +0100
Subject: [PATCH] Generate correct 0 bytes

---
 agb-gbafix/src/main.rs | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/agb-gbafix/src/main.rs b/agb-gbafix/src/main.rs
index 88747d80..de7e9fb1 100644
--- a/agb-gbafix/src/main.rs
+++ b/agb-gbafix/src/main.rs
@@ -19,7 +19,9 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
 
     let mut header = gbafix::GBAHeader::default();
 
-    let mut written_header = false;
+    const GBA_START_ADDRESS: u64 = 0x8000000;
+    let mut address = GBA_START_ADDRESS;
+
     for section_header in section_headers.iter() {
         const SHT_NOBITS: u32 = 8;
         const SHT_NULL: u32 = 0;
@@ -31,12 +33,16 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
             continue;
         }
 
+        for _ in address..section_header.sh_addr {
+            output.write_all(&[0])?;
+        }
+
         let (mut data, compression) = elf_file.section_data(&section_header)?;
         if let Some(compression) = compression {
             panic!("Cannot decompress elf content, but got compression header {compression:?}");
         }
 
-        if !written_header {
+        if address == GBA_START_ADDRESS {
             const GBA_HEADER_SIZE: usize = 192;
 
             assert!(
@@ -51,10 +57,11 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
             output.write_all(header_bytes)?;
 
             data = &data[GBA_HEADER_SIZE..];
-            written_header = true;
+            address += GBA_HEADER_SIZE as u64;
         }
 
         output.write_all(data)?;
+        address += data.len() as u64;
     }
 
     output.flush()?;