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 * \file        lzma/block.h
 * \brief       .xz Block handling
 */

/*
 * Author: Lasse Collin
 *
 * This file has been put into the public domain.
 * You can do whatever you want with this file.
 *
 * See ../lzma.h for information about liblzma as a whole.
 */

#ifndef LZMA_H_INTERNAL
#	error Never include this file directly. Use <lzma.h> instead.
#endif


/**
 * \brief       Options for the Block and Block Header encoders and decoders
 *
 * Different Block handling functions use different parts of this structure.
 * Some read some members, other functions write, and some do both. Only the
 * members listed for reading need to be initialized when the specified
 * functions are called. The members marked for writing will be assigned
 * new values at some point either by calling the given function or by
 * later calls to lzma_code().
 */
typedef struct {
	/**
	 * \brief       Block format version
	 *
	 * To prevent API and ABI breakages when new features are needed,
	 * a version number is used to indicate which fields in this
	 * structure are in use:
	 *   - liblzma >= 5.0.0: version = 0 is supported.
	 *   - liblzma >= 5.1.4beta: Support for version = 1 was added,
	 *     which adds the ignore_check field.
	 *
	 * If version is greater than one, most Block related functions
	 * will return LZMA_OPTIONS_ERROR (lzma_block_header_decode() works
	 * with any version value).
	 *
	 * Read by:
	 *  - All functions that take pointer to lzma_block as argument,
	 *    including lzma_block_header_decode().
	 *
	 * Written by:
	 *  - lzma_block_header_decode()
	 */
	uint32_t version;

	/**
	 * \brief       Size of the Block Header field
	 *
	 * This is always a multiple of four.
	 *
	 * Read by:
	 *  - lzma_block_header_encode()
	 *  - lzma_block_header_decode()
	 *  - lzma_block_compressed_size()
	 *  - lzma_block_unpadded_size()
	 *  - lzma_block_total_size()
	 *  - lzma_block_decoder()
	 *  - lzma_block_buffer_decode()
	 *
	 * Written by:
	 *  - lzma_block_header_size()
	 *  - lzma_block_buffer_encode()
	 */
	uint32_t header_size;
#	define LZMA_BLOCK_HEADER_SIZE_MIN 8
#	define LZMA_BLOCK_HEADER_SIZE_MAX 1024

	/**
	 * \brief       Type of integrity Check
	 *
	 * The Check ID is not stored into the Block Header, thus its value
	 * must be provided also when decoding.
	 *
	 * Read by:
	 *  - lzma_block_header_encode()
	 *  - lzma_block_header_decode()
	 *  - lzma_block_compressed_size()
	 *  - lzma_block_unpadded_size()
	 *  - lzma_block_total_size()
	 *  - lzma_block_encoder()
	 *  - lzma_block_decoder()
	 *  - lzma_block_buffer_encode()
	 *  - lzma_block_buffer_decode()
	 */
	lzma_check check;

	/**
	 * \brief       Size of the Compressed Data in bytes
	 *
	 * Encoding: If this is not LZMA_VLI_UNKNOWN, Block Header encoder
	 * will store this value to the Block Header. Block encoder doesn't
	 * care about this value, but will set it once the encoding has been
	 * finished.
	 *
	 * Decoding: If this is not LZMA_VLI_UNKNOWN, Block decoder will
	 * verify that the size of the Compressed Data field matches
	 * compressed_size.
	 *
	 * Usually you don't know this value when encoding in streamed mode,
	 * and thus cannot write this field into the Block Header.
	 *
	 * In non-streamed mode you can reserve space for this field before
	 * encoding the actual Block. After encoding the data, finish the
	 * Block by encoding the Block Header. Steps in detail:
	 *
	 *  - Set compressed_size to some big enough value. If you don't know
	 *    better, use LZMA_VLI_MAX, but remember that bigger values take
	 *    more space in Block Header.
	 *
	 *  - Call lzma_block_header_size() to see how much space you need to
	 *    reserve for the Block Header.
	 *
	 *  - Encode the Block using lzma_block_encoder() and lzma_code().
	 *    It sets compressed_size to the correct value.
	 *
	 *  - Use lzma_block_header_encode() to encode the Block Header.
	 *    Because space was reserved in the first step, you don't need
	 *    to call lzma_block_header_size() anymore, because due to
	 *