74 lines
1.9 KiB
C
74 lines
1.9 KiB
C
///////////////////////////////////////////////////////////////////////////////
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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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// 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_INDEX_H
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#define LZMA_INDEX_H
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#include "common.h"
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/// Minimum Unpadded Size
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#define UNPADDED_SIZE_MIN LZMA_VLI_C(5)
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/// Maximum Unpadded Size
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#define UNPADDED_SIZE_MAX (LZMA_VLI_MAX & ~LZMA_VLI_C(3))
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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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/// Set for how many Records to allocate memory the next time
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/// lzma_index_append() needs to allocate space for a new Record.
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/// This is used only by the Index decoder.
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extern void lzma_index_prealloc(lzma_index *i, lzma_vli records);
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/// Round the variable-length integer to the next multiple of four.
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static inline lzma_vli
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vli_ceil4(lzma_vli vli)
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{
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assert(vli <= LZMA_VLI_MAX);
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return (vli + 3) & ~LZMA_VLI_C(3);
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}
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/// Calculate the size of the Index field excluding Index Padding
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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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/// Calculate the size of the Index field including Index Padding
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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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return vli_ceil4(index_size_unpadded(count, index_list_size));
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}
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/// Calculate the total size of the Stream
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static inline lzma_vli
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index_stream_size(lzma_vli blocks_size,
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lzma_vli count, lzma_vli index_list_size)
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{
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return LZMA_STREAM_HEADER_SIZE + blocks_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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