Fix bug on decompression

The uncompressed length was being used where the compressed length was expected.

The particular compression input data that triggered the bug was added to
the eunit test.

c_src/snappy.cc

@@ -130,7 +130,7 @@ extern "C" {
         }
 
         bool valid = snappy::RawUncompress(reinterpret_cast<const char *>(input.data),
-                                           len,
+                                           input.size,
                                            reinterpret_cast<char *>(retBin.data));
 
         (void) valid;

test/snappy_tests.erl

@@ -49,4 +49,14 @@ decompression() ->
     {ok, Compressed} = Result,
 
     ?assertEqual({ok, Data}, snappy:decompress(Compressed)),
+
+    BigData = <<"mVPZzfDzKNeZrh1QdkMEgh2U0Bv2i3+bLJaCqgNibXuMuwfjrqTuxPGupxjI",
+                "xEbuYR+u/KZvSDhoxnkpPbgJo7oiQv2ibDrrGZx7RDs3Nn7Ww51B7+zUL4tr",
+                "G+16TlJilJT47Z4cQn8EpWex2bMRFAoJ6AMJAodLGbiD78yUyIorRKVcCa+k",
+                "udzjsqYAoXzW/z8JCB6rbGGSbnLyqztR//ch5sRwSvYARlV+IamzBkDXFZxj",
+                "5TAwAl2ZcbCeMX0qgXX4EonVZxc=">>,
+    Result2 = snappy:compress(BigData),
+    ?assertMatch({ok, _}, Result2),
+    {ok, Compressed2} = Result2,
+    ?assertEqual({ok, BigData}, snappy:decompress(Compressed2)),
     ok.