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73 lines
1.9 KiB
73 lines
1.9 KiB
/////////////////////////////////////////////////////////////////////////////// |
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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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