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-rw-r--r--include/data_reader.h33
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diff --git a/include/data_reader.h b/include/data_reader.h
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+/* SPDX-License-Identifier: GPL-3.0-or-later */
+#ifndef DATA_READER_H
+#define DATA_READER_H
+
+#include "squashfs.h"
+#include "compress.h"
+#include "fstree.h"
+
+typedef struct data_reader_t data_reader_t;
+
+/*
+ Create a data reader for accessing data blocks in a squashfs image.
+
+ Internally creates a fragment_reader_t (if applicable) to resolve
+ fragment indices.
+
+ Prints error messsages to stderr on failure.
+ */
+data_reader_t *data_reader_create(int fd, sqfs_super_t *super,
+ compressor_t *cmp);
+
+void data_reader_destroy(data_reader_t *data);
+
+/*
+ Use a file_info_t to locate and extract all blocks of the coresponding
+ file and its fragment, if it has one. The entire data is dumped to the
+ given file descriptor.
+
+ Returns 0 on success, prints error messages to stderr on failure.
+ */
+int data_reader_dump_file(data_reader_t *data, file_info_t *fi, int outfd);
+
+#endif /* DATA_READER_H */