lzw.h

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/*
 * This file is part of NetSurf's LibNSGIF, http://www.netsurf-browser.org/
 * Licensed under the MIT License,
 *                http://www.opensource.org/licenses/mit-license.php
 *
 * Copyright 2017 Michael Drake <michael.drake@codethink.co.uk>
 * Copyright 2021 Michael Drake <tlsa@netsurf-browser.org>
 */
 
#ifndef LZW_H_
#define LZW_H_
 
#include "fl/stl/int.h"
#include "fl/stl/noexcept.h"
 
namespace fl {
namespace third_party {


#define LZW_CODE_MAX 12
 
/* Declare lzw internal context structure */
struct lzw_ctx;

typedef enum lzw_result {
    LZW_OK,        
    LZW_OK_EOD,    
    LZW_NO_MEM,    
    LZW_NO_DATA,   
    LZW_EOI_CODE,  
    LZW_NO_COLOUR, 
    LZW_BAD_ICODE, 
    LZW_BAD_PARAM, 
    LZW_BAD_CODE,  
} lzw_result;

lzw_result lzw_context_create(
        struct lzw_ctx **ctx) FL_NOEXCEPT;

void lzw_context_destroy(
        struct lzw_ctx *ctx) FL_NOEXCEPT;

lzw_result lzw_decode_init(
        struct lzw_ctx *ctx,
        fl::u8 minimum_code_size,
        const fl::u8 *input_data,
        fl::size input_length,
        fl::size input_pos) FL_NOEXCEPT;

lzw_result lzw_decode(struct lzw_ctx *ctx,
        const fl::u8 **const output_data,
        fl::u32 *output_written) FL_NOEXCEPT;

lzw_result lzw_decode_init_map(
        struct lzw_ctx *ctx,
        fl::u8 minimum_code_size,
        fl::u32 transparency_idx,
        const fl::u32 *colour_table,
        const fl::u8 *input_data,
        fl::size input_length,
        fl::size input_pos) FL_NOEXCEPT;

lzw_result lzw_decode_map(struct lzw_ctx *ctx,
        fl::u32 *output_data,
        fl::u32 output_length,
        fl::u32 *output_written) FL_NOEXCEPT;
 
} // namespace third_party
} // namespace fl
 
#endif