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File Content: `block.h`

/**
 * \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
	 *    reserving, header_size has to be big enough. If it is "too big",
	 *    lzma_block_header_encode() will add enough Header Padding to
	 *    make Block Header to match the size specified by header_size.
	 *
	 * Read by:
	 *  - lzma_block_header_size()
	 *  - lzma_block_header_encode()
	 *  - lzma_block_compressed_size()
	 *  - lzma_block_unpadded_size()
	 *  - lzma_block_total_size()
	 *  - lzma_block_decoder()
	 *  - lzma_block_buffer_decode()
	 *
	 * Written by:
	 *  - lzma_block_header_decode()
	 *  - lzma_block_compressed_size()
	 *  - lzma_block_encoder()
	 *  - lzma_block_decoder()
	 *  - lzma_block_buffer_encode()
	 *  - lzma_block_buffer_decode()
	 */
	lzma_vli compressed_size;

	/**
	 * \brief       Uncompressed Size in bytes
	 *
	 * This is handled very similarly to compressed_size above.
	 *
	 * uncompressed_size is needed by fewer functions than
	 * compressed_size. This is because uncompressed_size isn't
	 * needed to validate that Block stays within proper limits.
	 *
	 * Read by:
	 *  - lzma_block_header_size()
	 *  - lzma_block_header_encode()
	 *  - lzma_block_decoder()
	 *  - lzma_block_buffer_decode()
	 *
	 * Written by:
	 *  - lzma_block_header_decode()
	 *  - lzma_block_encoder()
	 *  - lzma_block_decoder()
	 *  - lzma_block_buffer_encode()
	 *  - lzma_block_buffer_decode()
	 */
	lzma_vli uncompressed_size;

	/**
	 * \brief       Array of filters
	 *
	 * There can be 1-4 filters. The end of the array is marked with
	 * .id = LZMA_VLI_UNKNOWN.
	 *
	 * Read by:
	 *  - lzma_block_header_size()
	 *  - lzma_block_header_encode()
	 *  - lzma_block_encoder()
	 *  - lzma_block_decoder()
	 *  - lzma_block_buffer_encode()
	 *  - lzma_block_buffer_decode()
	 *
	 * Written by:
	 *  - lzma_block_header_decode(): Note that this does NOT free()
	 *    the old filter options structures. All unused filters[] will
	 *    have .id == LZMA_VLI_UNKNOWN and .options == NULL. If
	 *    decoding fails, all filters[] are guaranteed to be
	 *    LZMA_VLI_UNKNOWN and NULL.
	 *
	 * \note        Because of the array is terminated with
	 *              .id = LZMA_VLI_UNKNOWN, the actual array must
	 *              have LZMA_FILTERS_MAX + 1 members or the Block
	 *              Header decoder will overflow the buffer.
	 */
	lzma_filter *filters;

	/**
	 * \brief       Raw value stored in the Check field
	 *
	 * After successful coding, the first lzma_check_size(check) bytes
	 * of this array contain the raw value stored in the Check field.
	 *
	 * Note that CRC32 and CRC64 are stored in little endian byte order.
	 * Take it into account if you display the Check values to the user.
	 *
	 * Written by:
	 *  - lzma_block_encoder()
	 *  - lzma_block_decoder()
	 *  - lzma_block_buffer_encode()
	 *  - lzma_block_buffer_decode()
	 */
	uint8_t raw_check[LZMA_CHECK_SIZE_MAX];

	/*
	 * Reserved space to allow possible future extensions without
	 * breaking the ABI. You should not touch these, because the names
	 * of these variables may change. These are and will never be used
	 * with the currently supported options, so it is safe to leave these
	 * uninitialized.
	 */
	void *reserved_ptr1;
	void *reserved_ptr2;
	void *reserved_ptr3;
	uint32_t reserved_int1;
	uint32_t reserved_int2;
	lzma_vli reserved_int3;
	lzma_vli reserved_int4;
	lzma_vli reserved_int5;
	lzma_vli reserved_int6;
	lzma_vli reserved_int7;
	lzma_vli reserved_int8;
	lzma_reserved_enum reserved_enum1;
	lzma_reserved_enum reserved_enum2;
	lzma_reserved_enum reserved_enum3;
	lzma_reserved_enum reserved_enum4;

	/**
	 * \brief       A flag to Block decoder to not verify the Check field
	 *
	 * This field is supported by liblzma >= 5.1.4beta if .version >= 1.
	 *
	 * If this is set to true, the integrity check won't be calculated
	 * and verified. Unless you know what you are doing, you should
	 * leave this to false. (A reason to set this to true is when the
	 * file integrity is verified externally anyway and you want to
	 * speed up the decompression, which matters mostly when using
	 * SHA-256 as the integrity check.)
	 *
	 * If .version >= 1, read by:
	 *   - lzma_block_decoder()
	 *   - lzma_block_buffer_decode()
	 *
	 * Written by (.version is ignored):
	 *   - lzma_block_header_decode() always sets this to false
	 */
	lzma_bool ignore_check;

	lzma_bool reserved_bool2;
	lzma_bool reserved_bool3;
	lzma_bool reserved_bool4;
	lzma_bool reserved_bool5;
	lzma_bool reserved_bool6;
	lzma_bool reserved_bool7;
	lzma_bool reserved_bool8;

} lzma_block;


/**
 * \brief       Decode the Block Header Size field
 *
 * To decode Block Header using lzma_block_header_decode(), the size of the
 * Block Header has to be known and stored into lzma_block.header_size.
 * The size can be calculated from the first byte of a Block using this macro.
 * Note that if the first byte is 0x00, it indicates beginning of Index; use
 * this macro only when the byte is not 0x00.
 *
 * There is no encoding macro, because Block Header encoder is enough for that.
 */
#define lzma_block_header_size_decode(b) (((uint32_t)(b) + 1) * 4)


/**
 * \brief       Calculate Block Header Size
 *
 * Calculate the minimum size needed for the Block Header field using the
 * settings specified in the lzma_block structure. Note that it is OK to
 * increase the calculated header_size value as long as it is a multiple of
 * four and doesn't exceed LZMA_BLOCK_HEADER_SIZE_MAX. Increasing header_size
 * just means that lzma_block_header_encode() will add Header Padding.
 *
 * \return      - LZMA_OK: Size calculated successfully and stored to
 *                block->header_size.
 *              - LZMA_OPTIONS_ERROR: Unsupported version, filters or
 *                filter options.
 *              - LZMA_PROG_ERROR: Invalid values like compressed_size == 0.
 *
 * \note        This doesn't check that all the options are valid i.e. this
 *              may return LZMA_OK even if lzma_block_header_encode() or
 *              lzma_block_encoder() would fail. If you want to validate the
 *              filter chain, consider using lzma_memlimit_encoder() which as
 *              a side-effect validates the filter chain.
 */
extern LZMA_API(lzma_ret) lzma_block_header_size(lzma_block *block)
		lzma_nothrow lzma_attr_warn_unused_result;


/**
 * \brief       Encode Block Header
 *
 * The caller must have calculated the size of the Block Header already with
 * lzma_block_header_size(). If a value larger than the one calculated by
 * lzma_block_header_size() is used, the Block Header will be padded to the
 * specified size.
 *
 * \param       out         Beginning of the output buffer. This must be
 *                          at least block->header_size bytes.
 * \param       block       Block options to be encoded.
 *
 * \return      - LZMA_OK: Encoding was successful. block->header_size
 *                bytes were written to output buffer.
 *              - LZMA_OPTIONS_ERROR: Invalid or unsupported options.
 *              - LZMA_PROG_ERROR: Invalid arguments, for example
 *                block->header_size is invalid or block->filters is NULL.
 */
extern LZMA_API(lzma_ret) lzma_block_header_encode(
		const lzma_block *block, uint8_t *out)
		lzma_nothrow lzma_attr_warn_unused_result;


/**
 * \brief       Decode Block Header
 *
 * block->version should (usually) be set to the highest value supported
 * by the application. If the application sets block->version to a value
 * higher than supported by the current liblzma version, this function will
 * downgrade block->version to the highest value supported by it. Thus one
 * should check the value of block->version after calling this function if
 * block->version was set to a non-zero value and the application doesn't
 * otherwise know that the liblzma version being used is new enough to
 * support the specified block->version.
 *
 * The size of the Block Header must have already been decoded with
 * lzma_block_header_size_decode() macro and stored to block->header_size.
 *
 * The integrity check type from Stream Header must have been stored
 * to block->check.
 *
 * block->filters must have been allocated, but they don't need to be
 * initialized (possible existing filter options are not freed).
 *
 * \param       block       Destination for Block options.
 * \param       allocator   lzma_allocator for custom allocator functions.
 *                          Set to NULL to use malloc() (and also free()
 *                          if an error occurs).
 * \param       in          Beginning of the input buffer. This must be
 *                          at least block->header_size bytes.
 *
 * \return      - LZMA_OK: Decoding was successful. block->header_size
 *                bytes were read from the input buffer.
 *              - LZMA_OPTIONS_ERROR: The Block Header specifies some
 *                unsupported options such as unsupported filters. This can
 *                happen also if block->version was set to a too low value
 *                compared to what would be required to properly represent
 *                the information stored in the Block Header.
 *              - LZMA_DATA_ERROR: Block Header is corrupt, for example,
 *                the CRC32 doesn't match.
 *              - LZMA_PROG_ERROR: Invalid arguments, for example
 *                block->header_size is invalid or block->filters is NULL.
 */
extern LZMA_API(lzma_ret) lzma_block_header_decode(lzma_block *block,
		const lzma_allocator *allocator, const uint8_t *in)
		lzma_nothrow lzma_attr_warn_unused_result;


/**
 * \brief       Validate and set Compressed Size according to Unpadded Size
 *
 * Block Header stores Compressed Size, but Index has Unpadded Size. If the
 * application has already parsed the Index and is now decoding Blocks,
 * it can calculate Compressed Size from Unpadded Size. This function does
 * exactly that with error checking:
 *
 *  - Compressed Size calculated from Unpadded Size must be positive integer,
 *    that is, Unpadded Size must be big enough that after Block Header and
 *    Check fields there's still at least one byte for Compressed Size.
 *
 *  - If Compressed Size was present in Block Header, the new value
 *    calculated from Unpadded Size is compared against the value
 *    from Block Header.
 *
 * \note        This function must be called _after_ decoding the Block Header
 *              field so that it can properly validate Compressed Size if it
 *              was present in Block Header.
 *
 * \return      - LZMA_OK: block->compressed_size was set successfully.
 *              - LZMA_DATA_ERROR: unpadded_size is too small compared to
 *                block->header_size and lzma_check_size(block->check).
 *              - LZMA_PROG_ERROR: Some values are invalid. For example,
 *                block->header_size must be a multiple of four and
 *                between 8 and 1024 inclusive.
 */
extern LZMA_API(lzma_ret) lzma_block_compressed_size(
		lzma_block *block, lzma_vli unpadded_size)
		lzma_nothrow lzma_attr_warn_unused_result;


/**
 * \brief       Calculate Unpadded Size
 *
 * The Index field stores Unpadded Size and Uncompressed Size. The latter
 * can be taken directly from the lzma_block structure after coding a Block,
 * but Unpadded Size needs to be calculated from Block Header Size,
 * Compressed Size, and size of the Check field. This is where this function
 * is needed.
 *
 * \return      Unpadded Size on success, or zero on error.
 */
extern LZMA_API(lzma_vli) lzma_block_unpadded_size(const lzma_block *block)
		lzma_nothrow lzma_attr_pure;


/**
 * \brief       Calculate the total encoded size of a Block
 *
 * This is equivalent to lzma_block_unpadded_size() except that the returned
 * value includes the size of the Block Padding field.
 *
 * \return      On success, total encoded size of the Block. On error,
 *              zero is returned.
 */
extern LZMA_API(lzma_vli) lzma_block_total_size(const lzma_block *block)
		lzma_nothrow lzma_attr_pure;


/**
 * \brief       Initialize .xz Block encoder
 *
 * Valid actions for lzma_code() are LZMA_RUN, LZMA_SYNC_FLUSH (only if the
 * filter chain supports it), and LZMA_FINISH.
 *
 * \return      - LZMA_OK: All good, continue with lzma_code().
 *              - LZMA_MEM_ERROR
 *              - LZMA_OPTIONS_ERROR
 *              - LZMA_UNSUPPORTED_CHECK: block->check specifies a Check ID
 *                that is not supported by this buid of liblzma. Initializing
 *                the encoder failed.
 *              - LZMA_PROG_ERROR
 */
extern LZMA_API(lzma_ret) lzma_block_encoder(
		lzma_stream *strm, lzma_block *block)
		lzma_nothrow lzma_attr_warn_unused_result;


/**
 * \brief       Initialize .xz Block decoder
 *
 * Valid actions for lzma_code() are LZMA_RUN and LZMA_FINISH. Using
 * LZMA_FINISH is not required. It is supported only for convenience.
 *
 * \return      - LZMA_OK: All good, continue with lzma_code().
 *              - LZMA_UNSUPPORTED_CHECK: Initialization was successful, but
 *                the given Check ID is not supported, thus Check will be
 *                ignored.
 *              - LZMA_PROG_ERROR
 *              - LZMA_MEM_ERROR
 */
extern LZMA_API(lzma_ret) lzma_block_decoder(
		lzma_stream *strm, lzma_block *block)
		lzma_nothrow lzma_attr_warn_unused_result;


/**
 * \brief       Calculate maximum output size for single-call Block encoding
 *
 * This is equivalent to lzma_stream_buffer_bound() but for .xz Blocks.
 * See the documentation of lzma_stream_buffer_bound().
 */
extern LZMA_API(size_t) lzma_block_buffer_bound(size_t uncompressed_size)
		lzma_nothrow;


/**
 * \brief       Single-call .xz Block encoder
 *
 * In contrast to the multi-call encoder initialized with
 * lzma_block_encoder(), this function encodes also the Block Header. This
 * is required to make it possible to write appropriate Block Header also
 * in case the data isn't compressible, and different filter chain has to be
 * used to encode the data in uncompressed form using uncompressed chunks
 * of the LZMA2 filter.
 *
 * When the data isn't compressible, header_size, compressed_size, and
 * uncompressed_size are set just like when the data was compressible, but
 * it is possible that header_size is too small to hold the filter chain
 * specified in block->filters, because that isn't necessarily the filter
 * chain that was actually used to encode the data. lzma_block_unpadded_size()
 * still works normally, because it doesn't read the filters array.
 *
 * \param       block       Block options: block->version, block->check,
 *                          and block->filters must have been initialized.
 * \param       allocator   lzma_allocator for custom allocator functions.
 *                          Set to NULL to use malloc() and free().
 * \param       in          Beginning of the input buffer
 * \param       in_size     Size of the input buffer
 * \param       out         Beginning of the output buffer
 * \param       out_pos     The next byte will be written to out[*out_pos].
 *                          *out_pos is updated only if encoding succeeds.
 * \param       out_size    Size of the out buffer; the first byte into
 *                          which no data is written to is out[out_size].
 *
 * \return      - LZMA_OK: Encoding was successful.
 *              - LZMA_BUF_ERROR: Not enough output buffer space.
 *              - LZMA_UNSUPPORTED_CHECK
 *              - LZMA_OPTIONS_ERROR
 *              - LZMA_MEM_ERROR
 *              - LZMA_DATA_ERROR
 *              - LZMA_PROG_ERROR
 */
extern LZMA_API(lzma_ret) lzma_block_buffer_encode(
		lzma_block *block, const lzma_allocator *allocator,
		const uint8_t *in, size_t in_size,
		uint8_t *out, size_t *out_pos, size_t out_size)
		lzma_nothrow lzma_attr_warn_unused_result;


/**
 * \brief       Single-call uncompressed .xz Block encoder
 *
 * This is like lzma_block_buffer_encode() except this doesn't try to
 * compress the data and instead encodes the data using LZMA2 uncompressed
 * chunks. The required output buffer size can be determined with
 * lzma_block_buffer_bound().
 *
 * Since the data won't be compressed, this function ignores block->filters.
 * This function doesn't take lzma_allocator because this function doesn't
 * allocate any memory from the heap.
 */
extern LZMA_API(lzma_ret) lzma_block_uncomp_encode(lzma_block *block,
		const uint8_t *in, size_t in_size,
		uint8_t *out, size_t *out_pos, size_t out_size)
		lzma_nothrow lzma_attr_warn_unused_result;


/**
 * \brief       Single-call .xz Block decoder
 *
 * This is single-call equivalent of lzma_block_decoder(), and requires that
 * the caller has already decoded Block Header and checked its memory usage.
 *
 * \param       block       Block options just like with lzma_block_decoder().
 * \param       allocator   lzma_allocator for custom allocator functions.
 *                          Set to NULL to use malloc() and free().
 * \param       in          Beginning of the input buffer
 * \param       in_pos      The next byte will be read from in[*in_pos].
 *                          *in_pos is updated only if decoding succeeds.
 * \param       in_size     Size of the input buffer; the first byte that
 *                          won't be read is in[in_size].
 * \param       out         Beginning of the output buffer
 * \param       out_pos     The next byte will be written to out[*out_pos].
 *                          *out_pos is updated only if encoding succeeds.
 * \param       out_size    Size of the out buffer; the first byte into
 *                          which no data is written to is out[out_size].
 *
 * \return      - LZMA_OK: Decoding was successful.
 *              - LZMA_OPTIONS_ERROR
 *              - LZMA_DATA_ERROR
 *              - LZMA_MEM_ERROR
 *              - LZMA_BUF_ERROR: Output buffer was too small.
 *              - LZMA_PROG_ERROR
 */
extern LZMA_API(lzma_ret) lzma_block_buffer_decode(
		lzma_block *block, const lzma_allocator *allocator,
		const uint8_t *in, size_t *in_pos, size_t in_size,
		uint8_t *out, size_t *out_pos, size_t out_size)
		lzma_nothrow;
Name	Size	Permission
base.h	24858 bytes	0644
bcj.h	2630 bytes	0644
block.h	22106 bytes	0644
check.h	4255 bytes	0644
container.h	24844 bytes	0644
delta.h	1865 bytes	0644
filter.h	16429 bytes	0644
hardware.h	2605 bytes	0644
index.h	23491 bytes	0644
index_hash.h	3914 bytes	0644
lzma12.h	14743 bytes	0644
stream_flags.h	8253 bytes	0644
version.h	3497 bytes	0644
vli.h	6547 bytes	0644
File Content: block.h

File Content: `block.h`
