48 lines
1.8 KiB
C
48 lines
1.8 KiB
C
|
///////////////////////////////////////////////////////////////////////////////
|
||
|
|
//
|
||
|
|
/// \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
|