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/***************************************************************************
* __________ __ ___.
* 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>
#include <stddef.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);
struct inflate_bufferctx {
// initialize this with your input/output buffer.
// the pointer is updated as data is read or written.
void* buf;
// buffer end marker (= buf + buf_size).
void* end;
};
// reader and writer for using an in-memory buffer.
// Use 'inflate_bufferctx' as the context argument.
uint32_t inflate_buffer_reader(void* block, uint32_t block_size, void* ctx);
uint32_t inflate_buffer_writer(const void* block, uint32_t block_size, void* ctx);
// dummy writer used if you just want to figure out how big the decompressed
// data will be. It does not actually write any data. Example usage:
//
// size_t size = 0;
// inflate(it, st, read, rctx, inflate_getsize_writer, &size);
//
// Now 'size' will be the size of the decompressed data (assuming no errors).
uint32_t inflate_getsize_writer(const void* block, uint32_t block_size, void* ctx);
#endif
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