| /////////////////////////////////////////////////////////////////////////////// |
| // |
| /// \file block_encoder.h |
| /// \brief Encodes .xz Blocks |
| // |
| // Author: Lasse Collin |
| // |
| // This file has been put into the public domain. |
| // You can do whatever you want with this file. |
| // |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| #ifndef LZMA_BLOCK_ENCODER_H |
| #define LZMA_BLOCK_ENCODER_H |
| |
| #include "common.h" |
| |
| |
| /// \brief Biggest Compressed Size value that the Block encoder supports |
| /// |
| /// The maximum size of a single Block is limited by the maximum size of |
| /// a Stream, which in theory is 2^63 - 3 bytes (i.e. LZMA_VLI_MAX - 3). |
| /// While the size is really big and no one should hit it in practice, we |
| /// take it into account in some places anyway to catch some errors e.g. if |
| /// application passes insanely big value to some function. |
| /// |
| /// We could take into account the headers etc. to determine the exact |
| /// maximum size of the Compressed Data field, but the complexity would give |
| /// us nothing useful. Instead, limit the size of Compressed Data so that |
| /// even with biggest possible Block Header and Check fields the total |
| /// encoded size of the Block stays as a valid VLI. This doesn't guarantee |
| /// that the size of the Stream doesn't grow too big, but that problem is |
| /// taken care outside the Block handling code. |
| /// |
| /// ~LZMA_VLI_C(3) is to guarantee that if we need padding at the end of |
| /// the Compressed Data field, it will still stay in the proper limit. |
| /// |
| /// This constant is in this file because it is needed in both |
| /// block_encoder.c and block_buffer_encoder.c. |
| #define COMPRESSED_SIZE_MAX ((LZMA_VLI_MAX - LZMA_BLOCK_HEADER_SIZE_MAX \ |
| - LZMA_CHECK_SIZE_MAX) & ~LZMA_VLI_C(3)) |
| |
| |
| extern lzma_ret lzma_block_encoder_init(lzma_next_coder *next, |
| const lzma_allocator *allocator, lzma_block *block); |
| |
| #endif |