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68 lines
2 KiB
C
68 lines
2 KiB
C
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///////////////////////////////////////////////////////////////////////////////
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//
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/// \file index.h
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/// \brief Handling of Index
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//
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// Copyright (C) 2008 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_INDEX_H
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#define LZMA_INDEX_H
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#include "common.h"
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/// Maximum encoded value of Total Size.
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#define TOTAL_SIZE_ENCODED_MAX (LZMA_VLI_VALUE_MAX / 4 - 1)
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/// Convert the real Total Size value to a value that is stored to the Index.
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#define total_size_encode(size) ((size) / 4 - 1)
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/// Convert the encoded Total Size value from Index to the real Total Size.
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#define total_size_decode(size) (((size) + 1) * 4)
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/// Get the size of the Index Padding field. This is needed by Index encoder
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/// and decoder, but applications should have no use for this.
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extern uint32_t lzma_index_padding_size(const lzma_index *i);
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static inline lzma_vli
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index_size_unpadded(lzma_vli count, lzma_vli index_list_size)
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{
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// Index Indicator + Number of Records + List of Records + CRC32
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return 1 + lzma_vli_size(count) + index_list_size + 4;
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}
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static inline lzma_vli
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index_size(lzma_vli count, lzma_vli index_list_size)
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{
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// Round up to a mulitiple of four.
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return (index_size_unpadded(count, index_list_size) + 3)
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& ~LZMA_VLI_C(3);
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}
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static inline lzma_vli
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index_stream_size(
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lzma_vli total_size, lzma_vli count, lzma_vli index_list_size)
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{
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return LZMA_STREAM_HEADER_SIZE + total_size
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+ index_size(count, index_list_size)
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+ LZMA_STREAM_HEADER_SIZE;
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}
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#endif
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