1 | /**************************************************************************
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2 | *
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3 | * bitio_mem.h -- Functions for bitio to memory
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4 | * Copyright (C) 1994 Neil Sharman
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5 | *
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6 | * This program is free software; you can redistribute it and/or modify
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7 | * it under the terms of the GNU General Public License as published by
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8 | * the Free Software Foundation; either version 2 of the License, or
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9 | * (at your option) any later version.
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10 | *
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11 | * This program is distributed in the hope that it will be useful,
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12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 | * GNU General Public License for more details.
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15 | *
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16 | * You should have received a copy of the GNU General Public License
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17 | * along with this program; if not, write to the Free Software
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18 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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19 | *
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20 | **************************************************************************
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21 | *
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22 | * This file contains function definitions for doing bitwise input and output
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23 | * of numbers on an array of chars. These routines are faster than the ones
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24 | * in "mems" files. But with these routines you cannot mix reads and writes
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25 | * on the array of chars, or multiple write, at the same time and guarantee
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26 | * them to work, also you cannot seek to a point and do a write. The decode
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27 | * routine can detect when you run off the end of the array and will produce
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28 | * an approate error message, and the encode routine will stop when it gets
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29 | * to the end of the character array.
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30 | *
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31 | *
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32 | **************************************************************************/
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33 |
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34 |
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35 | #ifndef H_BITIO_MEM
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36 | #define H_BITIO_MEM
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37 |
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38 |
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39 |
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40 | typedef struct mem_bitio_state
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41 | {
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42 | unsigned char *Base;
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43 | unsigned char *Pos;
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44 | int Remaining;
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45 | unsigned char Buff;
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46 | unsigned char Btg;
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47 | }
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48 | mem_bitio_state;
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49 |
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50 |
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51 | /* NOTE : All bytes are filled high bit first */
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52 |
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53 |
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54 | void BIO_Mem_Encode_Start (void *buf, int rem, mem_bitio_state * bs);
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55 | void BIO_Mem_Encode_Done (mem_bitio_state * bs);
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56 |
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57 |
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58 |
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59 | void BIO_Mem_Decode_Start (void *buf, int rem, mem_bitio_state * bs);
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60 |
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61 |
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62 |
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63 | void BIO_Mem_Unary_Encode (mg_u_long val, mem_bitio_state * bs,
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64 | mg_u_long *bits);
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65 | mg_u_long BIO_Mem_Unary_Decode (mem_bitio_state * bs,
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66 | mg_u_long *bits);
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67 |
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68 |
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69 |
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70 | void BIO_Mem_Binary_Encode (mg_u_long val, mg_u_long b,
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71 | mem_bitio_state * bs, mg_u_long *bits);
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72 | mg_u_long BIO_Mem_Binary_Decode (mg_u_long b, mem_bitio_state * bs,
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73 | mg_u_long *bits);
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74 |
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75 |
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76 |
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77 | void BIO_Mem_Gamma_Encode (mg_u_long val, mem_bitio_state * bs,
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78 | mg_u_long *bits);
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79 | mg_u_long BIO_Mem_Gamma_Decode (mem_bitio_state * bs, mg_u_long *bits);
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80 |
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81 |
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82 |
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83 | void BIO_Mem_Delta_Encode (mg_u_long val, mem_bitio_state * bs,
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84 | mg_u_long *bits);
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85 | mg_u_long BIO_Mem_Delta_Decode (mem_bitio_state * bs, mg_u_long *bits);
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86 |
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87 |
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88 | void BIO_Mem_Elias_Encode (mg_u_long val, mg_u_long b, double s,
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89 | mem_bitio_state * bs, mg_u_long *bits);
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90 | mg_u_long BIO_Mem_Elias_Decode (mg_u_long b, double s,
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91 | mem_bitio_state * bs, mg_u_long *bits);
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92 |
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93 |
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94 | void BIO_Mem_Bblock_Encode (mg_u_long val, mg_u_long b,
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95 | mem_bitio_state * bs, mg_u_long *bits);
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96 | mg_u_long BIO_Mem_Bblock_Decode (mg_u_long b, mem_bitio_state * bs,
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97 | mg_u_long *bits);
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98 |
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99 |
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100 | void BIO_Mem_Decode_Seek (mg_u_long pos, mem_bitio_state * bs);
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101 |
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102 |
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103 | #endif
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