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