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authorLasse Collin <lasse.collin@tukaani.org>2007-12-09 00:42:33 +0200
committerLasse Collin <lasse.collin@tukaani.org>2007-12-09 00:42:33 +0200
commit5d018dc03549c1ee4958364712fb0c94e1bf2741 (patch)
tree1b211911fb33fddb3f04b77f99e81df23623ffc4 /src/liblzma/simple/simple_private.h
downloadxz-5d018dc03549c1ee4958364712fb0c94e1bf2741.tar.xz
Imported to git.
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+///////////////////////////////////////////////////////////////////////////////
+//
+/// \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