[3745] | 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 | * $Id: bitio_mem.h 3745 2003-02-20 21:20:24Z mdewsnip $
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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 faster than the ones
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| 26 | * in "mems" files. But with these routines you cannot mix reads and writes
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| 27 | * on the array of chars, or multiple write, at the same time and guarantee
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| 28 | * them to work, also you cannot seek to a point and do a write. The decode
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| 29 | * routine can detect when you run off the end of the array and will produce
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| 30 | * an approate error message, and the encode routine will stop when it gets
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| 31 | * to the end of the character array.
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| 32 | *
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| 33 | *
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| 34 | **************************************************************************/
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| 35 |
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| 36 |
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| 37 | #ifndef H_BITIO_MEM
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| 38 | #define H_BITIO_MEM
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| 39 |
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| 40 |
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| 41 |
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| 42 | typedef struct mem_bitio_state
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| 43 | {
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| 44 | unsigned char *Base;
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| 45 | unsigned char *Pos;
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| 46 | int Remaining;
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| 47 | unsigned char Buff;
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| 48 | unsigned char Btg;
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| 49 | }
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| 50 | mem_bitio_state;
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| 51 |
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| 52 |
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| 53 | /* NOTE : All bytes are filled high bit first */
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| 54 |
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| 55 |
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| 56 | void BIO_Mem_Encode_Start (void *buf, int rem, mem_bitio_state * bs);
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| 57 | void BIO_Mem_Encode_Done (mem_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_Mem_Decode_Start (void *buf, int rem, mem_bitio_state * bs);
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| 62 |
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| 63 |
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| 64 |
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| 65 | void BIO_Mem_Unary_Encode (unsigned long val, mem_bitio_state * bs,
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| 66 | unsigned long *bits);
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| 67 | unsigned long BIO_Mem_Unary_Decode (mem_bitio_state * bs,
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| 68 | unsigned long *bits);
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| 69 |
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| 70 |
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| 71 |
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| 72 | void BIO_Mem_Binary_Encode (unsigned long val, unsigned long b,
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| 73 | mem_bitio_state * bs, unsigned long *bits);
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| 74 | unsigned long BIO_Mem_Binary_Decode (unsigned long b, mem_bitio_state * bs,
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| 75 | unsigned long *bits);
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| 76 |
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| 77 |
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| 78 |
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| 79 | void BIO_Mem_Gamma_Encode (unsigned long val, mem_bitio_state * bs,
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| 80 | unsigned long *bits);
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| 81 | unsigned long BIO_Mem_Gamma_Decode (mem_bitio_state * bs, unsigned long *bits);
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| 82 |
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| 83 |
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| 84 |
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| 85 | void BIO_Mem_Delta_Encode (unsigned long val, mem_bitio_state * bs,
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| 86 | unsigned long *bits);
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| 87 | unsigned long BIO_Mem_Delta_Decode (mem_bitio_state * bs, unsigned long *bits);
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| 88 |
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| 89 |
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| 90 | void BIO_Mem_Elias_Encode (unsigned long val, unsigned long b, double s,
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| 91 | mem_bitio_state * bs, unsigned long *bits);
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| 92 | unsigned long BIO_Mem_Elias_Decode (unsigned long b, double s,
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| 93 | mem_bitio_state * bs, unsigned long *bits);
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| 94 |
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| 95 |
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| 96 | void BIO_Mem_Bblock_Encode (unsigned long val, unsigned long b,
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| 97 | mem_bitio_state * bs, unsigned long *bits);
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| 98 | unsigned long BIO_Mem_Bblock_Decode (unsigned long b, mem_bitio_state * bs,
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| 99 | unsigned long *bits);
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| 100 |
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| 101 |
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| 102 | void BIO_Mem_Decode_Seek (unsigned long pos, mem_bitio_state * bs);
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| 103 |
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| 104 |
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| 105 | #endif
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