2 files changed, 29 insertions, 4 deletions

diff --git a/src/util/fs.rs b/src/util/fs.rs
index 8ecd0d0..b1e9152 100644
--- a/src/util/fs.rs
+++ b/src/util/fs.rs
@@ -4,7 +4,10 @@ use std::path::Path;
 
 use tokio::fs::remove_file;
 
-use crate::errors::McError;
+use crate::{
+    errors::McError,
+    minecraft::manifests::{Library, Rule},
+};
 
 pub async fn remove_if_exists(path: &Path) -> Result<(), McError> {
     if path.exists() {
@@ -12,3 +15,24 @@ pub async fn remove_if_exists(path: &Path) -> Result<(), McError> {
     }
     Ok(())
 }
+
+pub fn library_allowed(lib: &Library) -> bool {
+    let rules: &Vec<Rule> = match &lib.rules {
+        | Some(r) => r,
+        | None => return true,
+    };
+
+    let mut allowed: bool = false;
+
+    for rule in rules {
+        let os_match: bool = match &rule.os {
+            | Some(os) => os.name == "linux",
+            | None => true,
+        };
+        if os_match {
+            allowed = rule.action == "allow";
+        }
+    }
+
+    allowed
+}
diff --git a/src/util/sha1.rs b/src/util/sha1.rs
index 6684963..6fed18d 100644
--- a/src/util/sha1.rs
+++ b/src/util/sha1.rs
@@ -2,14 +2,15 @@
 
 use std::path::Path;
 
-use sha1::{Digest, Sha1};
+use sha1::{Digest, Sha1, Sha1Core};
+use sha1::digest::core_api::CoreWrapper;
 use tokio::fs::read;
 
 use crate::errors::McError;
 
 pub async fn sha1_hex(path: &Path) -> Result<String, McError> {
-    let data = read(path).await?;
-    let mut hasher = Sha1::new();
+    let data: Vec<u8> = read(path).await?;
+    let mut hasher: CoreWrapper<Sha1Core> = Sha1::new();
     hasher.update(&data);
     Ok(format!("{:x}", hasher.finalize()))
 }