LCOM1920-T02G10

/**

 * \file        lzma/delta.h

 * \brief       Delta filter

 */

/*

 * 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       Filter ID

 *

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

 */

#define LZMA_FILTER_DELTA       LZMA_VLI_C(0x03)

/**

 * \brief       Type of the delta calculation

 *

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

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

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

 */

typedef enum {

        LZMA_DELTA_TYPE_BYTE

} lzma_delta_type;

/**

 * \brief       Options for the Delta filter

 *

 * These options are needed by both encoder and decoder.

 */

typedef struct {

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

        lzma_delta_type type;

        /**

         * \brief       Delta distance

         *

         * With the only currently supported type, LZMA_DELTA_TYPE_BYTE,

         * the distance is as bytes.

         *

         * Examples:

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

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

         */

        uint32_t dist;

#        define LZMA_DELTA_DIST_MIN 1

#        define LZMA_DELTA_DIST_MAX 256

        /*

         * 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

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

         * uninitialized.

         */

        uint32_t reserved_int1;

        uint32_t reserved_int2;

        uint32_t reserved_int3;

        uint32_t reserved_int4;

        void *reserved_ptr1;

        void *reserved_ptr2;

} lzma_options_delta;