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| 1 /////////////////////////////////////////////////////////////////////////////// |
| 2 // |
| 3 /// \file index.h |
| 4 /// \brief Handling of Index |
| 5 // |
| 6 // Author: Lasse Collin |
| 7 // |
| 8 // This file has been put into the public domain. |
| 9 // You can do whatever you want with this file. |
| 10 // |
| 11 /////////////////////////////////////////////////////////////////////////////// |
| 12 |
| 13 #ifndef LZMA_INDEX_H |
| 14 #define LZMA_INDEX_H |
| 15 |
| 16 #include "common.h" |
| 17 |
| 18 |
| 19 /// Minimum Unpadded Size |
| 20 #define UNPADDED_SIZE_MIN LZMA_VLI_C(5) |
| 21 |
| 22 /// Maximum Unpadded Size |
| 23 #define UNPADDED_SIZE_MAX (LZMA_VLI_MAX & ~LZMA_VLI_C(3)) |
| 24 |
| 25 |
| 26 /// Get the size of the Index Padding field. This is needed by Index encoder |
| 27 /// and decoder, but applications should have no use for this. |
| 28 extern uint32_t lzma_index_padding_size(const lzma_index *i); |
| 29 |
| 30 |
| 31 /// Set for how many Records to allocate memory the next time |
| 32 /// lzma_index_append() needs to allocate space for a new Record. |
| 33 /// This is used only by the Index decoder. |
| 34 extern void lzma_index_prealloc(lzma_index *i, lzma_vli records); |
| 35 |
| 36 |
| 37 /// Round the variable-length integer to the next multiple of four. |
| 38 static inline lzma_vli |
| 39 vli_ceil4(lzma_vli vli) |
| 40 { |
| 41 assert(vli <= LZMA_VLI_MAX); |
| 42 return (vli + 3) & ~LZMA_VLI_C(3); |
| 43 } |
| 44 |
| 45 |
| 46 /// Calculate the size of the Index field excluding Index Padding |
| 47 static inline lzma_vli |
| 48 index_size_unpadded(lzma_vli count, lzma_vli index_list_size) |
| 49 { |
| 50 // Index Indicator + Number of Records + List of Records + CRC32 |
| 51 return 1 + lzma_vli_size(count) + index_list_size + 4; |
| 52 } |
| 53 |
| 54 |
| 55 /// Calculate the size of the Index field including Index Padding |
| 56 static inline lzma_vli |
| 57 index_size(lzma_vli count, lzma_vli index_list_size) |
| 58 { |
| 59 return vli_ceil4(index_size_unpadded(count, index_list_size)); |
| 60 } |
| 61 |
| 62 |
| 63 /// Calculate the total size of the Stream |
| 64 static inline lzma_vli |
| 65 index_stream_size(lzma_vli blocks_size, |
| 66 lzma_vli count, lzma_vli index_list_size) |
| 67 { |
| 68 return LZMA_STREAM_HEADER_SIZE + blocks_size |
| 69 + index_size(count, index_list_size) |
| 70 + LZMA_STREAM_HEADER_SIZE; |
| 71 } |
| 72 |
| 73 #endif |
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