Split stream compression out of libio

Move it to a separate libxfrm library, where it can be independently
tested as well. The bulk of the new code is also mainly test cases
for the compressors.

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

1 files changed, 39 insertions, 0 deletions

diff --git a/include/xfrm/stream.h b/include/xfrm/stream.h
new file mode 100644
index 0000000..01639cd
--- /dev/null
+++ b/include/xfrm/stream.h
@@ -0,0 +1,39 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+/*
+ * stream.h
+ *
+ * Copyright (C) 2021 David Oberhollenzer <goliath@infraroot.at>
+ */
+#ifndef XFRM_STREAM_H
+#define XFRM_STREAM_H
+
+#include "sqfs/predef.h"
+
+typedef enum {
+	XFRM_STREAM_FLUSH_NONE = 0,
+	XFRM_STREAM_FLUSH_SYNC,
+	XFRM_STREAM_FLUSH_FULL,
+
+	XFRM_STREAM_FLUSH_COUNT,
+} XFRM_STREAM_FLUSH;
+
+typedef enum {
+	XFRM_STREAM_ERROR = -1,
+	XFRM_STREAM_OK = 0,
+	XFRM_STREAM_END = 1,
+	XFRM_STREAM_BUFFER_FULL = 2,
+} XFRM_STREAM_RESULT;
+
+typedef struct xfrm_stream_t xfrm_stream_t;
+
+struct xfrm_stream_t {
+	sqfs_object_t base;
+
+	int (*process_data)(xfrm_stream_t *stream,
+			    const void *in, sqfs_u32 in_size,
+			    void *out, sqfs_u32 out_size,
+			    sqfs_u32 *in_read, sqfs_u32 *out_written,
+			    int flush_mode);
+};
+
+#endif /* XFRM_STREAM_H */