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4441e00418
encoder and decoder, and put the shared things to block_private.h. Improved the checks a little so that they may detect too big Compressed Size at initialization time if lzma_options_block.total_size or .total_limit is known. Allow encoding and decoding Blocks with combinations of fields that are not allowed by the file format specification. Doing this requires that the application passes such a combination in lzma_options_lzma; liblzma doesn't do that, but it's not impossible that someone could find them useful in some custom file format.
96 lines
3.1 KiB
C
96 lines
3.1 KiB
C
///////////////////////////////////////////////////////////////////////////////
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//
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/// \file block_private.h
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/// \brief Common stuff for Block encoder and decoder
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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_BLOCK_COMMON_H
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#define LZMA_BLOCK_COMMON_H
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#include "common.h"
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static inline bool
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update_size(lzma_vli *size, lzma_vli add, lzma_vli limit)
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{
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if (limit > LZMA_VLI_VALUE_MAX)
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limit = LZMA_VLI_VALUE_MAX;
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if (limit < *size || limit - *size < add)
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return true;
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*size += add;
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return false;
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}
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static inline bool
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is_size_valid(lzma_vli size, lzma_vli reference)
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{
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return reference == LZMA_VLI_VALUE_UNKNOWN || reference == size;
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}
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/// If any of these tests fail, the caller has to return LZMA_PROG_ERROR.
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static inline bool
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validate_options_1(const lzma_options_block *options)
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{
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return options == NULL
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|| !lzma_vli_is_valid(options->compressed_size)
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|| !lzma_vli_is_valid(options->uncompressed_size)
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|| !lzma_vli_is_valid(options->total_size)
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|| !lzma_vli_is_valid(options->total_limit)
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|| !lzma_vli_is_valid(options->uncompressed_limit);
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}
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/// If any of these tests fail, the encoder has to return LZMA_PROG_ERROR
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/// because something is going horribly wrong if such values get passed
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/// to the encoder. In contrast, the decoder has to return LZMA_DATA_ERROR,
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/// since these tests failing indicate that something is wrong in the Stream.
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static inline bool
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validate_options_2(const lzma_options_block *options)
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{
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if ((options->uncompressed_size != LZMA_VLI_VALUE_UNKNOWN
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&& options->uncompressed_size
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> options->uncompressed_limit)
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|| (options->total_size != LZMA_VLI_VALUE_UNKNOWN
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&& options->total_size
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> options->total_limit)
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|| (!options->has_eopm && options->uncompressed_size
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== LZMA_VLI_VALUE_UNKNOWN)
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|| options->header_size > options->total_size)
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return true;
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if (options->compressed_size != LZMA_VLI_VALUE_UNKNOWN) {
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// Calculate a rough minimum possible valid Total Size of
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// this Block, and check that total_size and total_limit
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// are big enough. Note that the real minimum size can be
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// bigger due to the Check, Uncompressed Size, Backwards
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// Size, pr Padding being present. A rough check here is
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// enough for us to catch the most obvious errors as early
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// as possible.
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const lzma_vli total_min = options->compressed_size
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+ (lzma_vli)(options->header_size);
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if (total_min > options->total_size
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|| total_min > options->total_limit)
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return true;
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}
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return false;
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}
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#endif
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