diff --git a/voussoirkit/quickid.py b/voussoirkit/quickid.py
index b985bb6..81c663d 100644
--- a/voussoirkit/quickid.py
+++ b/voussoirkit/quickid.py
@@ -37,6 +37,24 @@ def equal_file(filename1, filename2, *args, **kwargs):
     with open(filename1, 'rb') as handle1, open(filename2, 'rb') as handle2:
         return equal_handle(handle1, handle2, *args, **kwargs)
 
+def matches_handle(handle, other_id):
+    (other_size, hashtype, chunk_size, other_hash) = other_id.split('_')
+    other_size = int(other_size)
+    chunk_size = int(chunk_size)
+
+    this_size = handle.seek(0, SEEK_END)
+    handle.seek(0)
+    if this_size != other_size:
+        return False
+
+    this_id = quickid_handle(handle, hashtype=hashtype, chunk_size=chunk_size)
+    return this_id == other_id
+
+def matches_file(filename, other_id):
+    filename = pathclass.Path(filename).absolute_path
+    with open(filename, 'rb') as handle:
+        return matches_handle(handle, other_id)
+
 def quickid_handle(handle, hashtype='md5', chunk_size=None):
     if chunk_size is None:
         chunk_size = CHUNK_SIZE