inflate: import initial module for deflate decompression

This will eventually be used by the ZIP module and other things
that support DEFLATE based streams.

Change-Id: I4acc9561eb56c9c368d1defab9c14e0454d105e1

1 files changed, 46 insertions, 0 deletions

diff --git a/firmware/include/inflate.h b/firmware/include/inflate.h
new file mode 100644
index 0000000000..b0685e8fbb
--- /dev/null
+++ b/firmware/include/inflate.h
@@ -0,0 +1,46 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2021 by James Buren (libflate adaptations for RockBox)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+
+#ifndef _INFLATE_H_
+#define _INFLATE_H_
+
+#include <stdint.h>
+
+enum {
+    INFLATE_RAW,
+    INFLATE_ZLIB,
+    INFLATE_GZIP,
+};
+
+struct inflate;
+
+typedef uint32_t inflate_reader(void* block, uint32_t block_size, void* ctx);
+typedef uint32_t inflate_writer(const void* block, uint32_t block_size, void* ctx);
+
+extern const uint32_t inflate_size;
+extern const uint32_t inflate_align;
+
+// 'it' must be allocated by the caller. it must be at least 'inflate_size' bytes
+// and aligned at 'inflate_align' bytes. 'st' is the type of stream to decompress;
+// see above enum for possible options.
+int inflate(struct inflate* it, int st, inflate_reader read, void* rctx, inflate_writer write, void* wctx);
+
+#endif