75 lines
2.2 KiB
C
75 lines
2.2 KiB
C
///////////////////////////////////////////////////////////////////////////////
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//
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/// \file simple_private.h
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/// \brief Private definitions for so called simple filters
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//
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// Author: Lasse Collin
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//
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// This file has been put into the public domain.
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// You can do whatever you want with this file.
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//
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///////////////////////////////////////////////////////////////////////////////
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#ifndef LZMA_SIMPLE_PRIVATE_H
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#define LZMA_SIMPLE_PRIVATE_H
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#include "simple_coder.h"
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typedef struct {
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/// Next filter in the chain
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lzma_next_coder next;
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/// True if the next coder in the chain has returned LZMA_STREAM_END.
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bool end_was_reached;
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/// True if filter() should encode the data; false to decode.
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/// Currently all simple filters use the same function for encoding
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/// and decoding, because the difference between encoders and decoders
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/// is very small.
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bool is_encoder;
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/// Pointer to filter-specific function, which does
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/// the actual filtering.
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size_t (*filter)(void *simple, uint32_t now_pos,
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bool is_encoder, uint8_t *buffer, size_t size);
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/// Pointer to filter-specific data, or NULL if filter doesn't need
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/// any extra data.
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void *simple;
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/// The lowest 32 bits of the current position in the data. Most
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/// filters need this to do conversions between absolute and relative
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/// addresses.
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uint32_t now_pos;
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/// Size of the memory allocated for the buffer.
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size_t allocated;
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/// Flushing position in the temporary buffer. buffer[pos] is the
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/// next byte to be copied to out[].
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size_t pos;
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/// buffer[filtered] is the first unfiltered byte. When pos is smaller
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/// than filtered, there is unflushed filtered data in the buffer.
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size_t filtered;
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/// Total number of bytes (both filtered and unfiltered) currently
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/// in the temporary buffer.
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size_t size;
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/// Temporary buffer
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uint8_t buffer[];
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} lzma_simple_coder;
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extern lzma_ret lzma_simple_coder_init(lzma_next_coder *next,
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const lzma_allocator *allocator,
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const lzma_filter_info *filters,
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size_t (*filter)(void *simple, uint32_t now_pos,
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bool is_encoder, uint8_t *buffer, size_t size),
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size_t simple_size, size_t unfiltered_max,
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uint32_t alignment, bool is_encoder);
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#endif
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