Add utility functions to read the fragment data from an image

Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>

1 files changed, 31 insertions, 0 deletions

diff --git a/include/frag_reader.h b/include/frag_reader.h
new file mode 100644
index 0000000..6495f5b
--- /dev/null
+++ b/include/frag_reader.h
@@ -0,0 +1,31 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+#ifndef FRAG_READER_H
+#define FRAG_READER_H
+
+#include "squashfs.h"
+#include "compress.h"
+
+#include <stdint.h>
+#include <stddef.h>
+
+typedef struct {
+	sqfs_fragment_t *tbl;
+	size_t num_fragments;
+
+	int fd;
+	compressor_t *cmp;
+	size_t block_size;
+	size_t used;
+	size_t current_index;
+	uint8_t buffer[];
+} frag_reader_t;
+
+frag_reader_t *frag_reader_create(sqfs_super_t *super, int fd,
+				  compressor_t *cmp);
+
+void frag_reader_destroy(frag_reader_t *f);
+
+int frag_reader_read(frag_reader_t *f, size_t index, size_t offset,
+		     void *buffer, size_t size);
+
+#endif /* FRAG_READER_H */