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specification. Simplify things by removing most of the support for known uncompressed size in most places. There are some miscellaneous changes here and there too. The API of liblzma has got many changes and still some more will be done soon. While most of the code has been updated, some things are not fixed (the command line tool will choke with invalid filter chain, if nothing else). Subblock filter is somewhat broken for now. It will be updated once the encoded format of the Subblock filter has been decided.
83 lines
2.7 KiB
C
83 lines
2.7 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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// Copyright (C) 2007 Lasse Collin
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; either
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// version 2.1 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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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 lzma_simple_s lzma_simple;
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struct lzma_coder_s {
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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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/// or if we have processed uncompressed_size bytes.
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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)(lzma_simple *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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lzma_simple *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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};
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extern lzma_ret lzma_simple_coder_init(lzma_next_coder *next,
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lzma_allocator *allocator, const lzma_filter_info *filters,
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size_t (*filter)(lzma_simple *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, bool is_encoder);
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#endif
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