From 7a10cd38214bc6e244d89333ed23d0c36855bb4a Mon Sep 17 00:00:00 2001
From: Harald Eilertsen <haraldei@anduin.net>
Date: Thu, 26 Nov 2020 16:15:23 +0100
Subject: Get back to where we were.

Only, now the root_chunk parser will return the value it has parsed, so
it can be used outside of the parser. Not used for anything other than
printing the information for now, though.
---
 src/main.rs | 43 ++++++++++++++++++++++++-------------------
 1 file changed, 24 insertions(+), 19 deletions(-)

diff --git a/src/main.rs b/src/main.rs
index 414f1c0..5a3bf36 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -26,7 +26,6 @@ use nom::{
     number::complete::*,
     sequence::tuple,
     Finish,
-    InputTake,
     IResult,
 };
 use std::{
@@ -263,10 +262,14 @@ fn fourcc<'a>(data: &'a [u8]) -> IResult<&'a [u8], &'a str> {
     Ok((rest, std::str::from_utf8(tag).unwrap()))
 }
 
-fn root_chunk<'a>(data: &'a [u8]) -> IResult<&'a [u8], ()> {
-    let (rest, (key, val)) = tuple((cmstring, cmstring))(data)?;
-    println!("    {}: {}", key, val);
-    Ok((rest, ()))
+/**
+ * Root chunks allways have the same layout, two length prefixed strings.
+ *
+ * These seem to be a mapping between a field name, and the data type the field contains.
+ * The actual data follows in the ARCH chunk following this ROOT chunk.
+ */
+fn root_chunk<'a>(data: &'a [u8]) -> IResult<&'a [u8], (&str, &str)> {
+    tuple((cmstring, cmstring))(data)
 }
 
 
@@ -304,20 +307,6 @@ fn arch_chunk<'a>(data: &'a [u8]) -> IResult<&'a [u8], ()> {
     Ok((rest, ()))
 }
 
-fn chunk<'a>(data: &'a [u8]) -> IResult<&'a [u8], ()> {
-    let (rest, (tag, payload)) = tuple((fourcc, length_data(be_u32)))(data)?;
-
-    println!("  {}: {}", tag, payload.len());
-
-    match tag {
-        "ROOT" => root_chunk(payload)?,
-        "ARCH" => arch_chunk(payload)?,
-        &_     => (payload, ())
-    };
-
-    Ok((rest, ()))
-}
-
 struct RiffChunk<'a> {
     fourcc: &'a str,
     payload: &'a [u8],
@@ -383,6 +372,22 @@ where
 
     for chunk in chunks {
         println!("{}: {}", chunk.fourcc, chunk.payload.len());
+
+        match chunk.fourcc {
+            "ROOT" => {
+                let (r, (k, v)) = root_chunk(chunk.payload).finish().map_err(|e| format!("{:?}", e))?;
+                assert_eq!(r.len(), 0);
+                println!("  {}: {}", k, v);
+            },
+            "ARCH" => {
+                arch_chunk(chunk.payload).finish().map_err(|e| format!("{:?}", e))?;
+            },
+            _ => {
+                eprintln!("[-] Warning: ignoring unknown chunk \"{}\" of length {} bytes.",
+                    chunk.fourcc,
+                    chunk.payload.len());
+            }
+        };
     }
 
     Ok(proj)
-- 
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