/**

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* \file lzma/delta.h

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* \brief Delta filter

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*/

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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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* See ../lzma.h for information about liblzma as a whole.

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*/

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#ifndef LZMA_H_INTERNAL

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

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#endif

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/**

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* \brief Filter ID

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*

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* Filter ID of the Delta filter. This is used as lzma_filter.id.

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*/

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#define LZMA_FILTER_DELTA LZMA_VLI_C(0x03)

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/**

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* \brief Type of the delta calculation

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*

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* Currently only byte-wise delta is supported. Other possible types could

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* be, for example, delta of 16/32/64-bit little/big endian integers, but

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* these are not currently planned since byte-wise delta is almost as good.

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*/

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typedef enum {

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LZMA_DELTA_TYPE_BYTE

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} lzma_delta_type;

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/**

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* \brief Options for the Delta filter

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*

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* These options are needed by both encoder and decoder.

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*/

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typedef struct {

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/** For now, this must always be LZMA_DELTA_TYPE_BYTE. */

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lzma_delta_type type;

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/**

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* \brief Delta distance

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*

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* With the only currently supported type, LZMA_DELTA_TYPE_BYTE,

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* the distance is as bytes.

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*

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* Examples:

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* - 16-bit stereo audio: distance = 4 bytes

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* - 24-bit RGB image data: distance = 3 bytes

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*/

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uint32_t dist;

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# define LZMA_DELTA_DIST_MIN 1

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# define LZMA_DELTA_DIST_MAX 256

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/*

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* Reserved space to allow possible future extensions without

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* breaking the ABI. You should not touch these, because the names

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* of these variables may change. These are and will never be used

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* when type is LZMA_DELTA_TYPE_BYTE, so it is safe to leave these

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* uninitialized.

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*/

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uint32_t reserved_int1;

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uint32_t reserved_int2;

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uint32_t reserved_int3;

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uint32_t reserved_int4;

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void *reserved_ptr1;

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void *reserved_ptr2;

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} lzma_options_delta;

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