src/ext.rs: Fix parsing of nanoseconds in timestamps

The operator precedence assumptions were incorrect. The mask itself was
being shifted instead of the masked value.

Other places where operator precedence is confusing have also been
updated to add parentheses. There is a now clippy lint for this too.

Fixes: #13

Signed-off-by: Andrew Gunnerson <[email protected]>

Author: chenxiaolong

src/ext.rs

@@ -1116,7 +1116,7 @@ impl ExtMetadata {
 
     pub fn size(&self) -> u64 {
         let small = self.inode.as_ptr();
-        unsafe { u64::from((*small).i_size) | u64::from((*small).i_size_high) << 32 }
+        unsafe { u64::from((*small).i_size) | (u64::from((*small).i_size_high) << 32) }
     }
 
     pub fn nlinks(&self) -> u16 {
@@ -1140,7 +1140,7 @@ impl ExtMetadata {
             _ => 0,
         };
 
-        u32::from(low) | u32::from(high) << 16
+        u32::from(low) | (u32::from(high) << 16)
     }
 
     pub fn set_uid(&mut self, uid: u32) {
@@ -1164,7 +1164,7 @@ impl ExtMetadata {
             _ => 0,
         };
 
-        u32::from(low) | u32::from(high) << 16
+        u32::from(low) | (u32::from(high) << 16)
     }
 
     pub fn set_gid(&mut self, gid: u32) {
@@ -1185,7 +1185,7 @@ impl ExtMetadata {
 
         if let Some(e) = extra {
             secs += i64::from(e & EXT4_EPOCH_MASK) << 32;
-            nsecs = e & EXT4_NSEC_MASK as u32 >> EXT4_EPOCH_BITS;
+            nsecs = (e & EXT4_NSEC_MASK as u32) >> EXT4_EPOCH_BITS;
         }
 
         // This inherently can't overflow because of the original u32 types.