diff --git a/libsparse/backed_block.h b/libsparse/backed_block.h
new file mode 100644
index 0000000..7b7c90a
--- /dev/null
+++ b/libsparse/backed_block.h
@@ -0,0 +1,39 @@
+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef _BACKED_BLOCK_H_
+#define _BACKED_BLOCK_H_
+
+#include <sparse/sparse.h>
+
+typedef void (*data_block_callback_t)(void *priv, int64_t off, void *data, int len);
+typedef void (*data_block_fill_callback_t)(void *priv, int64_t off, unsigned int fill_val, int len);
+typedef void (*data_block_file_callback_t)(void *priv, int64_t off,
+					   const char *file, int64_t offset,
+					   int len);
+
+void for_each_data_block(data_block_callback_t data_func,
+	data_block_file_callback_t file_func,
+	data_block_fill_callback_t fill_func, void *priv, unsigned int);
+
+void queue_data_block(void *data, unsigned int len, unsigned int block);
+void queue_fill_block(unsigned int fill_val, unsigned int len, unsigned int block);
+void queue_data_file(const char *filename, int64_t offset, unsigned int len,
+		unsigned int block);
+
+void free_data_blocks();
+
+#endif