Add error handling for unsupported audio formats

Cargo.lock

@@ -65,6 +65,7 @@ dependencies = [
  "num-derive",
  "num-traits",
  "pretty_env_logger",
+ "thiserror",
  "zip",
 ]
 
@@ -441,6 +442,26 @@ dependencies = [
  "unicode-width",
 ]
 
+[[package]]
+name = "thiserror"
+version = "1.0.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7dfdd070ccd8ccb78f4ad66bf1982dc37f620ef696c6b5028fe2ed83dd3d0d08"
+dependencies = [
+ "thiserror-impl",
+]
+
+[[package]]
+name = "thiserror-impl"
+version = "1.0.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bd80fc12f73063ac132ac92aceea36734f04a1d93c1240c6944e23a3b8841793"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "thread_local"
 version = "1.0.1"

Cargo.toml

@@ -7,10 +7,11 @@ edition = "2018"
 [dependencies]
 anyhow = "1.0.31"
 byteorder = "1.3.4"
+clap = "3.0.0-beta.1"
 log = "0.4.8"
 nom = "5.1.1"
 num-derive = "0.3"
 num-traits = "0.2"
 pretty_env_logger = "0.4"
+thiserror = "1.0.20"
 zip = { version = "0.5.5", default-features = false, features = ["deflate"] }
-clap = "3.0.0-beta.1"

src/xact3/xwb.rs

@@ -1,7 +1,7 @@
 use std::collections::HashMap;
 use std::convert::TryInto;
 
-use anyhow::{anyhow, Result};
+use anyhow::Result;
 use log::{debug, info, warn};
 use nom::bytes::complete::tag;
 use nom::error::ParseError;
@@ -10,13 +10,20 @@ use nom::number::complete::{le_i32, le_u32};
 use nom::{take_str, IResult};
 use num_derive::FromPrimitive;
 use num_traits::FromPrimitive;
+use thiserror::Error;
 
 use crate::utils;
 use crate::utils::exec_nom_parser;
 use crate::xact3::adpcm;
 
+#[derive(Error, Debug)]
+pub enum Error {
+    #[error("{0:?} is not a supported format")]
+    UnsupportedFormat(FormatTag),
+}
+
 #[derive(Clone, FromPrimitive, Debug, PartialEq)]
-enum FormatTag {
+pub enum FormatTag {
     PCM = 0,
     XMA = 1,
     ADPCM = 2,
@@ -43,11 +50,11 @@ impl From<u32> for Format {
 }
 
 impl TryInto<adpcm::WaveFormat> for Format {
-    type Error = anyhow::Error;
+    type Error = Error;
 
-    fn try_into(self) -> Result<adpcm::WaveFormat> {
+    fn try_into(self) -> Result<adpcm::WaveFormat, Error> {
         if self.tag != FormatTag::ADPCM {
-            return Err(anyhow!("Format is not ADPCM"));
+            return Err(Error::UnsupportedFormat(self.tag));
         }
 
         let n_block_align = (self.alignment as u16 + 22) * self.channels;
@@ -236,6 +243,9 @@ pub struct Sound<'a> {
 
 impl Sound<'_> {
     pub fn to_wav(&self) -> Result<Vec<u8>> {
-        adpcm::build_wav(self.format.clone().try_into()?, self.data)
+        match &self.format.tag {
+            FormatTag::ADPCM => adpcm::build_wav(self.format.clone().try_into()?, self.data),
+            _ => Err(Error::UnsupportedFormat(self.format.tag.clone()).into()),
+        }
     }
 }