impl Decoder

src/fot.rs

@@ -1,2 +1,3 @@
 mod raw;
+mod decoder;
 pub mod save;

src/fot/decoder.rs

@@ -0,0 +1,25 @@
+use std::str;
+use anyhow::anyhow;
+use anyhow::Result;
+use crate::fot::raw::Raw;
+
+pub trait Decoder: Sized {
+    fn decode(raw: &Raw, offset: usize, size: usize) -> Result<Self>;
+    fn encode(&self) -> Raw;
+}
+
+impl Decoder for String {
+    fn decode(raw: &Raw, offset: usize, size: usize) -> Result<Self> {
+        let str = &raw.mem[offset..];
+        match str.iter().position(|&c| c == 0) {
+            Some(pos) => Ok(str::from_utf8(&str[..pos])?.to_string()),
+            None => Ok(str::from_utf8(&raw.mem[offset..offset+size])?.to_string())
+        }
+    }
+
+    fn encode(&self) -> Raw {
+        let mut str = self.clone().into_bytes();
+        str.push(0);
+        Raw { offset: 0, size: str.len(), mem: str}
+    }
+}

src/fot/raw.rs

@@ -7,6 +7,7 @@ use std::path::Path;
 use memmem::{Searcher, TwoWaySearcher};
 use anyhow::Result;
 
+#[derive(Debug)]
 pub struct Raw {
     pub offset: usize,
     pub size: usize,

src/fot/save.rs

@@ -7,7 +7,9 @@ use anyhow::anyhow;
 use anyhow::Result;
 use inflate::inflate_bytes_zlib;
 use deflate::deflate_bytes_zlib;
+use crate::fot::decoder::Decoder;
 use crate::fot::raw::Raw;
+use crate::fot::decoder;
 
 #[derive(Debug)]
 pub struct World {
@@ -98,4 +100,11 @@ impl Save {
 
         Ok(())
     }
+
+    pub fn test(&self) -> Result<()> {
+        let a = "hello".to_string().encode();
+        dbg!(a);
+
+        Ok(())
+    }
 }

src/main.rs

@@ -18,5 +18,6 @@ fn main() {
         println!("World {:x} size {}", w.offset, w.size);
     }
 
-    save.save(Path::new("out.sav")).expect("failed to save");
+    //save.save(Path::new("out.sav")).expect("failed to save");
+    save.test().expect("test");
 }