1 | /**************************************************************************
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2 | *
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3 | * bitio_m_mem.h -- Macros 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 macros for doing bitwise input and output on an array
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23 | * of chars. These routines are faster than the ones in "mems" files. But
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24 | * with these routines you cannot mix reads and writes on the array of chars,
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25 | * or multiple write, at the same time and guarantee them to work, also you
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26 | * cannot seek to a point and do a write. The decode routine can detect when
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27 | * you run off the end of the array and will produce an approate error
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28 | * message, and the encode routine will stop when it gets to the end of the
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29 | * character array.
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30 | *
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31 | **************************************************************************/
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32 |
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33 | #ifndef H_BITIO_M_MEM
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34 | #define H_BITIO_M_MEM
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35 |
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36 | #include "bitio_m_abstract.h"
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37 |
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38 |
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39 | class mem_bitio_buffer : public bitio_buffer {
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40 | protected:
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41 | unsigned char *pos;
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42 | unsigned char *base;
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43 | int remaining;
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44 | unsigned char buffer;
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45 | unsigned char btg;
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46 |
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47 | public:
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48 | mem_bitio_buffer ();
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49 | mem_bitio_buffer (unsigned char *buffer, int size);
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50 | void seek (unsigned long topos);
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51 | void error ();
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52 | long add00 (long b);
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53 | long addff (long b);
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54 | int bit ();
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55 | void done ();
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56 |
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57 | void encodeStart ();
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58 | void encodeBit (int bit);
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59 | void encodeDone () { flush(); }
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60 | int encodeVerify ();
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61 | int encodeLength ();
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62 | void flush ();
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63 | };
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64 |
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65 |
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66 | /*
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67 | #define ENCODE_START(p,r) \
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68 | { \
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69 | mem_bitio_buffer buffer(p, r); \
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70 | buffer.encodeStart();
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71 |
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72 | #define ENCODE_CONTINUE(b) \
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73 | { \
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74 | mem_bitio_buffer buffer; \
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75 | buffer.unpause(b);
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76 |
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77 | #define ENCODE_PAUSE(b) buffer.pause(&b);}
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78 |
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79 | #define ENCODE_FLUSH buffer.flush()
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80 |
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81 | #define ENCODE_DONE buffer.flush();}
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82 |
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83 |
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84 | #define DECODE_START(p,r) \
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85 | { \
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86 | mem_bitio_buffer buffer(p,r);
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87 |
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88 | #define DECODE_CONTINUE(b) \
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89 | { \
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90 | mem_bitio_buffer buffer; \
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91 | buffer.unpause(b);
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92 |
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93 | #define DECODE_ADD_FF(b) b = buffer.addff(b)
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94 |
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95 | #define DECODE_ADD_00(b) b = buffer.add00(b)
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96 |
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97 | #define DECODE_BIT buffer.bit()
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98 |
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99 | #define DECODE_DONE buffer.done();}
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100 |
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101 | #define DECODE_PAUSE(b) buffer.pause(&b);}
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102 | */
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103 |
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104 | #endif
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