OLD | NEW |
(Empty) | |
| 1 /////////////////////////////////////////////////////////////////////////////// |
| 2 // |
| 3 /// \file block_encoder.h |
| 4 /// \brief Encodes .xz Blocks |
| 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_BLOCK_ENCODER_H |
| 14 #define LZMA_BLOCK_ENCODER_H |
| 15 |
| 16 #include "common.h" |
| 17 |
| 18 |
| 19 /// \brief Biggest Compressed Size value that the Block encoder supports |
| 20 /// |
| 21 /// The maximum size of a single Block is limited by the maximum size of |
| 22 /// a Stream, which in theory is 2^63 - 3 bytes (i.e. LZMA_VLI_MAX - 3). |
| 23 /// While the size is really big and no one should hit it in practice, we |
| 24 /// take it into account in some places anyway to catch some errors e.g. if |
| 25 /// application passes insanely big value to some function. |
| 26 /// |
| 27 /// We could take into account the headers etc. to determine the exact |
| 28 /// maximum size of the Compressed Data field, but the complexity would give |
| 29 /// us nothing useful. Instead, limit the size of Compressed Data so that |
| 30 /// even with biggest possible Block Header and Check fields the total |
| 31 /// encoded size of the Block stays as a valid VLI. This doesn't guarantee |
| 32 /// that the size of the Stream doesn't grow too big, but that problem is |
| 33 /// taken care outside the Block handling code. |
| 34 /// |
| 35 /// ~LZMA_VLI_C(3) is to guarantee that if we need padding at the end of |
| 36 /// the Compressed Data field, it will still stay in the proper limit. |
| 37 /// |
| 38 /// This constant is in this file because it is needed in both |
| 39 /// block_encoder.c and block_buffer_encoder.c. |
| 40 #define COMPRESSED_SIZE_MAX ((LZMA_VLI_MAX - LZMA_BLOCK_HEADER_SIZE_MAX \ |
| 41 - LZMA_CHECK_SIZE_MAX) & ~LZMA_VLI_C(3)) |
| 42 |
| 43 |
| 44 extern lzma_ret lzma_block_encoder_init(lzma_next_coder *next, |
| 45 lzma_allocator *allocator, lzma_block *block); |
| 46 |
| 47 #endif |
OLD | NEW |