hash: convert names to lowercase when matching

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "xc3-file-loader"
-version = "1.3.0"
+version = "1.3.1"
 authors = ["RoccoDev <[email protected]>"]
 edition = "2021"
 license = "gpl-3.0"
@@ -28,4 +28,4 @@ panic = "abort"
 [profile.release]
 panic = "abort"
 lto = true
-strip = true
+strip = true

src/hash.rs

@@ -41,12 +41,15 @@ pub struct IdentityHasher(u64);
 
 pub type PreHashedSet<K> = std::collections::HashSet<K, IdentityHasher>;
 
-pub fn crc32(name: &str) -> u32 {
+/// Calculates a CRC-32 hash of the given string,
+/// converting any uppercase characters to lowercase beforehand.
+pub fn crc32_lowercase(name: &str) -> u32 {
     if name.is_empty() {
         return 0;
     }
     let mut hash = 0u32;
     for b in name.bytes() {
+        let b = if (b'A'..=b'Z').contains(&b) { b + 32 } else { b };
         let val = hash ^ b as u32;
         hash = (hash >> 8) ^ CRC_TABLE[val as usize & 0xff];
     }

src/loader.rs

@@ -3,7 +3,7 @@ use std::borrow::Borrow;
 use std::ffi::{CStr, CString};
 use std::mem::MaybeUninit;
 
-use crate::hash::{crc32, PreHashedSet};
+use crate::hash::{crc32_lowercase, PreHashedSet};
 
 /// Top-level paths to skip when matching romfs paths
 static TOP_LEVEL_BLACKLIST: [&str; 5] = ["bf3.ard", "bf3.arh", "movie", "sound", "skyline"];
@@ -36,7 +36,7 @@ impl FileLoader {
     }
 
     pub fn is_blocked(&self, file_name: &str) -> bool {
-        self.block_list.contains(&crc32(file_name))
+        self.block_list.contains(&crc32_lowercase(file_name))
     }
 
     unsafe fn import_dir(&mut self, path: &str, level: usize) -> Result<()> {
@@ -88,7 +88,7 @@ impl FileLoader {
     fn register_file(&mut self, path: &str) {
         assert!(path.len() >= 4); // rom:/<file name>
         let path = &path[4..];
-        let hash = crc32(path);
+        let hash = crc32_lowercase(path);
         dbg_println!("[XC3-Files] Registering {path}");
         if !self.block_list.insert(hash) {
             // The game also uses CRC-32 internally to cache resources. It's likely that