1 files changed, 22 insertions, 10 deletions

diff --git a/src/ram.rs b/src/ram.rs
index c7c4d43..34723cb 100644
--- a/src/ram.rs
+++ b/src/ram.rs
@@ -38,16 +38,22 @@ struct HexLine {
 }
 
 impl HexLine {
-    fn from(s: &str) -> Result<Self, i32> {
+    fn from(s: &str) -> Result<Self, usize> {
         // The shortest possible sequence is EOF (:00000001FF)
         if s.len() < 11 {
-            return Err(1)
+            return Err(usize::max_value())
         }
         if &s[0..1] != ":" {
-            return Err(2)
+            return Err(0)
         }
-        let offset = (&s[3..7]).parse::<u16>().unwrap(); // TODO: handle unwrap
-        let bytecount = (&s[1..3]).parse::<usize>().unwrap(); // TODO: handle unwrap
+        let offset = match (&s[3..7]).parse::<u16>() {
+            Ok(value) => value,
+            Err(_) => return Err(3),
+        };
+        let bytecount = match(&s[1..3]).parse::<usize>() {
+            Ok(value) => value,
+            Err(_) => return Err(1),
+        };
 
         // If EOF reached
         if &s[7..9] == "01" {
@@ -56,7 +62,10 @@ impl HexLine {
             let mut counter = 9;
             let mut data = vec![];
             while counter < s.len() - 2 && counter < (9 + bytecount * 2) {
-                data.push((&s[counter..counter+2]).parse::<u8>().unwrap()); // TODO handle unwrap
+                data.push(match(&s[counter..counter+2]).parse::<u8>() {
+                    Ok(value) => value,
+                    Err(_) => return Err(counter),
+                });
                 counter += 2;
             }
             // TODO: check checksum
@@ -68,10 +77,13 @@ impl HexLine {
 }
 
 impl Ram {
-    pub fn from_hex(hex: String) -> Self {
+    pub fn from_hex(hex: String) -> Result<Self, String> {
         let mut array = [0; u16::max_value() as usize + 1];
-        for line in hex.lines() {
-            let hex_line = HexLine::from(line).unwrap(); // TODO: handle unwrap
+        for (linenum, line) in hex.lines().enumerate() {
+            let hex_line = match HexLine::from(line) {
+                Ok(value) => value,
+                Err(charnum) => return Err(format!("ihex parsing error {}:{}", linenum, charnum)),
+            };
             let offset = hex_line.offset;
             match hex_line.rectyp {
                 Rectyp::Data => {
@@ -82,6 +94,6 @@ impl Ram {
                 Rectyp::EndOfFile => {}
             }
         }
-        Self { array }
+        Ok(Self { array })
     }
 }