1 | /**************************************************************************
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2 | *
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3 | * bitio_mems.h -- Functions for bitio to memory (random access)
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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 slower than the ones
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24 | * in "mem" files. but with these routines you can mix reads and writes, or
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25 | * multiple writes, on the array of chars at the same time and guarantee
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26 | * them to work, also you can seek to a point and do a write. The decode and
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27 | * encode functions cannot detect when the end off the character is reached
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28 | * and just continue processing.
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29 | *
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30 | **************************************************************************/
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31 |
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32 | #ifndef H_BITIO_MEMS
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33 | #define H_BITIO_MEMS
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34 |
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35 |
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36 |
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37 | typedef struct mems_bitio_state
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38 | {
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39 | unsigned char *Base;
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40 | unsigned long pos;
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41 | }
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42 | mems_bitio_state;
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43 |
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44 |
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45 | /* NOTE : All bytes are filled high bit first */
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46 |
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47 |
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48 | void BIO_Mems_Encode_Start (char *buf, unsigned long pos, mems_bitio_state * bs);
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49 | void BIO_Mems_Encode_Done (mems_bitio_state * bs);
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50 |
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51 |
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52 |
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53 | void BIO_Mems_Decode_Start (void *buf, unsigned long pos, mems_bitio_state * bs);
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54 |
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55 |
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56 |
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57 | void BIO_Mems_Unary_Encode (unsigned long val, mems_bitio_state * bs,
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58 | unsigned long *bits);
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59 | unsigned long BIO_Mems_Unary_Decode (mems_bitio_state * bs,
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60 | unsigned long *bits);
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61 |
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62 |
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63 |
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64 | void BIO_Mems_Binary_Encode (unsigned long val, unsigned long b,
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65 | mems_bitio_state * bs, unsigned long *bits);
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66 | unsigned long BIO_Mems_Binary_Decode (unsigned long b, mems_bitio_state * bs,
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67 | unsigned long *bits);
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68 |
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69 |
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70 |
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71 | void BIO_Mems_Gamma_Encode (unsigned long val, mems_bitio_state * bs,
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72 | unsigned long *bits);
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73 | unsigned long BIO_Mems_Gamma_Decode (mems_bitio_state * bs, unsigned long *bits);
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74 |
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75 |
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76 |
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77 | void BIO_Mems_Delta_Encode (unsigned long val, mems_bitio_state * bs,
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78 | unsigned long *bits);
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79 | unsigned long BIO_Mems_Delta_Decode (mems_bitio_state * bs, unsigned long *bits);
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80 |
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81 |
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82 | void BIO_Mems_Elias_Encode (unsigned long val, unsigned long b, double s,
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83 | mems_bitio_state * bs, unsigned long *bits);
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84 | unsigned long BIO_Mems_Elias_Decode (unsigned long b, double s,
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85 | mems_bitio_state * bs, unsigned long *bits);
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86 |
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87 |
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88 | void BIO_Mems_Bblock_Encode (unsigned long val, unsigned long b,
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89 | mems_bitio_state * bs, unsigned long *bits);
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90 | unsigned long BIO_Mems_Bblock_Decode (unsigned long b, mems_bitio_state * bs,
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91 | unsigned long *bits);
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92 |
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93 |
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94 | void BIO_Mems_Decode_Seek (unsigned long pos, mems_bitio_state * bs);
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95 |
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96 |
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97 | #endif
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