Implement seek_for_prev

librocksdb-sys/src/lib.rs

@@ -294,6 +294,8 @@ extern "C" {
 
     pub fn rocksdb_iter_seek(iterator: *mut rocksdb_iterator_t, k: *const c_char, klen: size_t);
 
+    pub fn rocksdb_iter_seek_for_prev(iterator: *mut rocksdb_iterator_t, k: *const c_char, klen: size_t);
+
     pub fn rocksdb_iter_next(iterator: *mut rocksdb_iterator_t);
 
     pub fn rocksdb_iter_prev(iterator: *mut rocksdb_iterator_t);

src/db.rs

@@ -260,12 +260,10 @@ impl DBRawIterator {
         self.just_seeked = true;
     }
 
-/*
-    pub fn seek_for_prev(&mut self, key: [u8]) {
+    pub fn seek_for_prev(&mut self, key: &[u8]) {
         unsafe { ffi::rocksdb_iter_seek_for_prev(self.inner, key.as_ptr() as *const c_char, key.len() as size_t); }
         self.just_seeked = true;
     }
-*/
 
     pub fn next(&mut self) -> bool {
         // Initial call to next() after seeking should not move the iterator