update readme for tools and fix extraction

README.md

@@ -2,4 +2,7 @@
 Does the bare minimum of unpacking all data packs based off of `Pack.db` (converted to plain text). I plan on fleshing this out soon.
 
 ## Instructions
-Compile, copy `files.txt` and the `Pack` folder from game files next to the executable.
+Compile, copy `files.txt` and the `Pack` folder from game files next to the executable.
+
+## Tools
+`decompress_gzip.sh` - Run from inside `Pack/` to decompress all gzipped files (PVR texture files).

src/extract.c

@@ -139,15 +139,20 @@ i32 extractPacks() {
         strcat(full_file_path, path);
         FILE *unpacked_file = fopen(full_file_path, "wb+");
 
-        // TODO: some files are under 48 bytes? which is the size of the file header?
-        if (remove_header && size > 0x30) {
+        if (remove_header) {
             offset += 0x30;
-            size -= 0x30;
         }
 
         fseek(data_packs[pack], offset, SEEK_SET);
 
-        u8 *file_buffer = malloc(size);
+        u8 *file_buffer;
+        if (remove_header) {
+            file_buffer = malloc(size);
+        } else {
+            // size doesn't account for file header
+            file_buffer = malloc(size + 0x30);
+        }
+
         if (file_buffer == NULL) {
             printLog("ERROR: failed to allocate file buffer");
             break;