158551Skris/////////////////////////////////////////////////////////////////////////////// 258551Skris// 358551Skris/// \file simple_private.h 458551Skris/// \brief Private definitions for so called simple filters 5228060Sbapt// 6228060Sbapt// Author: Lasse Collin 7228060Sbapt// 858551Skris// This file has been put into the public domain. 9228060Sbapt// You can do whatever you want with this file. 1058551Skris// 11228060Sbapt/////////////////////////////////////////////////////////////////////////////// 12228060Sbapt 13228060Sbapt#ifndef LZMA_SIMPLE_PRIVATE_H 14228060Sbapt#define LZMA_SIMPLE_PRIVATE_H 1558551Skris 16228060Sbapt#include "simple_coder.h" 17228060Sbapt 18228060Sbapt 19228060Sbapttypedef struct { 2058551Skris /// Next filter in the chain 21228060Sbapt lzma_next_coder next; 22228060Sbapt 23228060Sbapt /// True if the next coder in the chain has returned LZMA_STREAM_END. 24228060Sbapt bool end_was_reached; 2558551Skris 2658551Skris /// True if filter() should encode the data; false to decode. 2758551Skris /// Currently all simple filters use the same function for encoding 2858551Skris /// and decoding, because the difference between encoders and decoders 29228060Sbapt /// is very small. 30228060Sbapt bool is_encoder; 31228060Sbapt 32228060Sbapt /// Pointer to filter-specific function, which does 33228060Sbapt /// the actual filtering. 34228060Sbapt size_t (*filter)(void *simple, uint32_t now_pos, 35228060Sbapt bool is_encoder, uint8_t *buffer, size_t size); 36228060Sbapt 3758551Skris /// Pointer to filter-specific data, or NULL if filter doesn't need 3858551Skris /// any extra data. 3958551Skris void *simple; 40228060Sbapt 41228060Sbapt /// The lowest 32 bits of the current position in the data. Most 42228060Sbapt /// filters need this to do conversions between absolute and relative 43228060Sbapt /// addresses. 44228060Sbapt uint32_t now_pos; 45228060Sbapt 46228060Sbapt /// Size of the memory allocated for the buffer. 47228060Sbapt size_t allocated; 48228060Sbapt 49228060Sbapt /// Flushing position in the temporary buffer. buffer[pos] is the 50228060Sbapt /// next byte to be copied to out[]. 51228060Sbapt size_t pos; 52228060Sbapt 53228060Sbapt /// buffer[filtered] is the first unfiltered byte. When pos is smaller 54228060Sbapt /// than filtered, there is unflushed filtered data in the buffer. 5558551Skris size_t filtered; 56228060Sbapt 57228060Sbapt /// Total number of bytes (both filtered and unfiltered) currently 5858551Skris /// in the temporary buffer. 59228060Sbapt size_t size; 60228060Sbapt 61228060Sbapt /// Temporary buffer 62228060Sbapt uint8_t buffer[]; 63228060Sbapt} lzma_simple_coder; 64228060Sbapt 65228060Sbapt 6658551Skrisextern lzma_ret lzma_simple_coder_init(lzma_next_coder *next, 6758551Skris const lzma_allocator *allocator, 6858551Skris const lzma_filter_info *filters, 6958551Skris size_t (*filter)(void *simple, uint32_t now_pos, 7058551Skris bool is_encoder, uint8_t *buffer, size_t size), 7158551Skris size_t simple_size, size_t unfiltered_max, 7258551Skris uint32_t alignment, bool is_encoder); 7358551Skris 7458551Skris#endif 7558551Skris