///////////////////////////////////////////////////////////////////////////////
//
/// \file simple_private.h
/// \brief Private definitions for so called simple filters
//
// Copyright (C) 2007 Lasse Collin
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
///////////////////////////////////////////////////////////////////////////////
#ifndef LZMA_SIMPLE_PRIVATE_H
#define LZMA_SIMPLE_PRIVATE_H
#include "simple_coder.h"
typedef struct lzma_simple_s lzma_simple;
struct lzma_coder_s {
/// Next filter in the chain
lzma_next_coder next;
/// True if the next coder in the chain has returned LZMA_STREAM_END
/// or if we have processed uncompressed_size bytes.
bool end_was_reached;
/// True if filter() should encode the data; false to decode.
/// Currently all simple filters use the same function for encoding
/// and decoding, because the difference between encoders and decoders
/// is very small.
bool is_encoder;
/// Size of the data *left* to be processed, or LZMA_VLI_VALUE_UNKNOWN
/// if unknown.
lzma_vli uncompressed_size;
/// Pointer to filter-specific function, which does
/// the actual filtering.
size_t (*filter)(lzma_simple *simple, uint32_t now_pos,
bool is_encoder, uint8_t *buffer, size_t size);
/// Pointer to filter-specific data, or NULL if filter doesn't need
/// any extra data.
lzma_simple *simple;
/// The lowest 32 bits of the current position in the data. Most
/// filters need this to do conversions between absolute and relative
/// addresses.
uint32_t now_pos;
/// Size of the memory allocated for the buffer.
size_t allocated;
/// Flushing position in the temporary buffer. buffer[pos] is the
/// next byte to be copied to out[].
size_t pos;
/// buffer[filtered] is the first unfiltered byte. When pos is smaller
/// than filtered, there is unflushed filtered data in the buffer.
size_t filtered;
/// Total number of bytes (both filtered and unfiltered) currently
/// in the temporary buffer.
size_t size;
/// Temporary buffer
uint8_t buffer[];
};
extern lzma_ret lzma_simple_coder_init(lzma_next_coder *next,
lzma_allocator *allocator, const lzma_filter_info *filters,
size_t (*filter)(lzma_simple *simple, uint32_t now_pos,
bool is_encoder, uint8_t *buffer, size_t size),
size_t simple_size, size_t unfiltered_max, bool is_encoder);
#endif
