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1 /* SPDX-License-Identifier: 0BSD */
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2
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3 /**
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4 * \file lzma/delta.h
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5 * \brief Delta filter
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6 * \note Never include this file directly. Use <lzma.h> instead.
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7 */
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8
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9 /*
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10 * Author: Lasse Collin
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11 */
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12
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13 #ifndef LZMA_H_INTERNAL
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14 # error Never include this file directly. Use <lzma.h> instead.
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15 #endif
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16
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17
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18 /**
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19 * \brief Filter ID
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20 *
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21 * Filter ID of the Delta filter. This is used as lzma_filter.id.
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22 */
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23 #define LZMA_FILTER_DELTA LZMA_VLI_C(0x03)
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24
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25
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26 /**
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27 * \brief Type of the delta calculation
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28 *
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29 * Currently only byte-wise delta is supported. Other possible types could
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30 * be, for example, delta of 16/32/64-bit little/big endian integers, but
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31 * these are not currently planned since byte-wise delta is almost as good.
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32 */
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33 typedef enum {
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34 LZMA_DELTA_TYPE_BYTE
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35 } lzma_delta_type;
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36
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37
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38 /**
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39 * \brief Options for the Delta filter
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40 *
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41 * These options are needed by both encoder and decoder.
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42 */
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43 typedef struct {
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44 /** For now, this must always be LZMA_DELTA_TYPE_BYTE. */
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45 lzma_delta_type type;
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46
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47 /**
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48 * \brief Delta distance
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49 *
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50 * With the only currently supported type, LZMA_DELTA_TYPE_BYTE,
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51 * the distance is as bytes.
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52 *
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53 * Examples:
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54 * - 16-bit stereo audio: distance = 4 bytes
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55 * - 24-bit RGB image data: distance = 3 bytes
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56 */
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57 uint32_t dist;
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58
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59 /**
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60 * \brief Minimum value for lzma_options_delta.dist.
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61 */
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62 # define LZMA_DELTA_DIST_MIN 1
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63
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64 /**
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65 * \brief Maximum value for lzma_options_delta.dist.
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66 */
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67 # define LZMA_DELTA_DIST_MAX 256
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68
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69 /*
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70 * Reserved space to allow possible future extensions without
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71 * breaking the ABI. You should not touch these, because the names
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72 * of these variables may change. These are and will never be used
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73 * when type is LZMA_DELTA_TYPE_BYTE, so it is safe to leave these
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74 * uninitialized.
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75 */
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76
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77 /** \private Reserved member. */
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78 uint32_t reserved_int1;
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79
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80 /** \private Reserved member. */
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81 uint32_t reserved_int2;
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82
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83 /** \private Reserved member. */
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84 uint32_t reserved_int3;
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85
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86 /** \private Reserved member. */
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87 uint32_t reserved_int4;
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88
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89 /** \private Reserved member. */
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90 void *reserved_ptr1;
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91
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92 /** \private Reserved member. */
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93 void *reserved_ptr2;
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94
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95 } lzma_options_delta;
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