update

compress.h

@@ -0,0 +1,34 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef __EROFS_FS_COMPRESS_H
+#define __EROFS_FS_COMPRESS_H
+
+#include "internal.h"
+
+struct z_erofs_decompress_req {
+	struct erofs_sb_info *sbi;
+	const struct erofs_map_blocks *map;
+	const void *in;
+	size_t inputsize;
+	void *out;
+	size_t outputsize;
+	bool partial_decoding;
+};
+
+struct z_erofs_decompressor {
+	/* Callbacks return zero or a positive FreeBSD errno. */
+	int (*config)(struct erofs_sb_info *, const struct erofs_super_block *,
+	    const void *, size_t);
+	int (*decompress)(const struct z_erofs_decompress_req *);
+	bool supports_subextent;
+	const char *name;
+};
+
+bool z_erofs_decompress_supports_subextent(
+    const struct erofs_map_blocks *map);
+int z_erofs_lz4_decompress(const struct z_erofs_decompress_req *rq);
+extern const struct z_erofs_decompressor z_erofs_lzma_decomp;
+extern const struct z_erofs_decompressor z_erofs_deflate_decomp;
+extern const struct z_erofs_decompressor z_erofs_zstd_decomp;
+
+#endif /* __EROFS_FS_COMPRESS_H */