| 1 | /**************************************************************************
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| 2 | *
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| 3 | * bitio_random.h -- Functions for bitio to a file (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 | * $Id: bitio_random.h 439 1999-08-10 21:23:37Z sjboddie $
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| 21 | *
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| 22 | **************************************************************************
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| 23 | *
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| 24 | * This file contains function definitions for doing bitwise input and output
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| 25 | * of numbers on an array of chars. These routines are slower than the ones
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| 26 | * in "mem" files. but with these routines you can mix reads and writes, or
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| 27 | * multiple writes, on the array of chars at the same time and guarantee
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| 28 | * them to work, also you can seek to a point and do a write. The decode and
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| 29 | * encode functions cannot detect when the end off the character is reached
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| 30 | * and just continue processing.
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| 31 | *
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| 32 | **************************************************************************/
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| 33 |
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| 34 | #ifndef H_BITIO_RANDOM
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| 35 | #define H_BITIO_RANDOM
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| 36 |
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| 37 |
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| 38 |
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| 39 | typedef struct random_bitio_state
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| 40 | {
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| 41 | FILE *File;
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| 42 | unsigned char *Buf;
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| 43 | unsigned long Base;
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| 44 | unsigned long Used;
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| 45 | unsigned long pos;
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| 46 | unsigned long len;
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| 47 | unsigned long sft;
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| 48 | }
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| 49 | random_bitio_state;
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| 50 |
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| 51 |
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| 52 | /* NOTE : All bytes are filled high bit first */
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| 53 |
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| 54 |
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| 55 | void BIO_Random_Start (FILE * f, unsigned long len,
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| 56 | random_bitio_state * bs);
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| 57 | void BIO_Random_Done (random_bitio_state * bs);
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| 58 |
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| 59 |
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| 60 |
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| 61 | void BIO_Random_Decode_Start (void *buf, unsigned long pos,
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| 62 | random_bitio_state * bs);
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| 63 |
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| 64 | void BIO_Random_Encode_Bit (int bit, random_bitio_state * bs);
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| 65 |
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| 66 | int BIO_Random_Decode_Bit (random_bitio_state * bs);
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| 67 |
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| 68 |
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| 69 | void BIO_Random_Unary_Encode (unsigned long val, random_bitio_state * bs,
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| 70 | unsigned long *bits);
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| 71 | unsigned long BIO_Random_Unary_Decode (random_bitio_state * bs,
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| 72 | unsigned long *bits);
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| 73 |
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| 74 |
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| 75 |
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| 76 | void BIO_Random_Binary_Encode (unsigned long val, unsigned long b,
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| 77 | random_bitio_state * bs, unsigned long *bits);
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| 78 | unsigned long BIO_Random_Binary_Decode (unsigned long b, random_bitio_state * bs,
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| 79 | unsigned long *bits);
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| 80 |
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| 81 |
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| 82 |
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| 83 | void BIO_Random_Gamma_Encode (unsigned long val, random_bitio_state * bs,
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| 84 | unsigned long *bits);
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| 85 | unsigned long BIO_Random_Gamma_Decode (random_bitio_state * bs,
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| 86 | unsigned long *bits);
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| 87 |
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| 88 |
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| 89 |
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| 90 | void BIO_Random_Delta_Encode (unsigned long val, random_bitio_state * bs,
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| 91 | unsigned long *bits);
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| 92 | unsigned long BIO_Random_Delta_Decode (random_bitio_state * bs,
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| 93 | unsigned long *bits);
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| 94 |
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| 95 |
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| 96 | void BIO_Random_Elias_Encode (unsigned long val, unsigned long b, double s,
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| 97 | random_bitio_state * bs, unsigned long *bits);
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| 98 | unsigned long BIO_Random_Elias_Decode (unsigned long b, double s,
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| 99 | random_bitio_state * bs,
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| 100 | unsigned long *bits);
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| 101 |
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| 102 |
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| 103 | void BIO_Random_Bblock_Encode (unsigned long val, unsigned long b,
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| 104 | random_bitio_state * bs, unsigned long *bits);
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| 105 | unsigned long BIO_Random_Bblock_Decode (unsigned long b,
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| 106 | random_bitio_state * bs,
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| 107 | unsigned long *bits);
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| 108 |
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| 109 |
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| 110 | void BIO_Random_Seek (unsigned long pos, random_bitio_state * bs);
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| 111 |
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| 112 | void BIO_Random_Flush (random_bitio_state * bs);
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| 113 |
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| 114 | unsigned long BIO_Random_Tell (random_bitio_state * bs);
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| 115 |
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| 116 |
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| 117 | #endif
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