feat: null-ptr fix

libraries/libarchive/src/error.rs

@@ -42,14 +42,14 @@ impl fmt::Display for ArchiveError {
     }
 }
 
-impl<'a> From<&'a archive::Handle> for ArchiveError {
-    fn from(handle: &'a archive::Handle) -> ArchiveError {
+impl<'a> From<&'a dyn archive::Handle> for ArchiveError {
+    fn from(handle: &'a dyn archive::Handle) -> ArchiveError {
         ArchiveError::Sys(handle.err_code(), handle.err_msg())
     }
 }
 
-impl<'a> From<&'a archive::Handle> for ArchiveResult<()> {
-    fn from(handle: &'a archive::Handle) -> ArchiveResult<()> {
+impl<'a> From<&'a dyn archive::Handle> for ArchiveResult<()> {
+    fn from(handle: &'a dyn archive::Handle) -> ArchiveResult<()> {
         match handle.err_code() {
             ErrCode(0) => Ok(()),
             _ => Err(ArchiveError::from(handle)),

libraries/libarchive/src/reader.rs

@@ -57,7 +57,13 @@ pub trait Reader: Handle {
         unsafe {
             match ffi::archive_read_data_block(self.handle(), &mut buff, &mut size, &mut offset) {
                 ffi::ARCHIVE_EOF => Ok(None),
-                ffi::ARCHIVE_OK => Ok(Some(slice::from_raw_parts(buff as *const u8, size))),
+                ffi::ARCHIVE_OK => {
+                    if buff != ptr::null() {
+                        Ok(Some(slice::from_raw_parts(buff as *const u8, size)))
+                    } else {
+                        return self.read_block();
+                    }
+                }
                 _ => Err(ArchiveError::Sys(self.err_code(), self.err_msg())),
             }
         }