[3365] | 1 | /**************************************************************************
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| 2 | *
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| 3 | * bitio_m_random.h -- Macros 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 | **************************************************************************
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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 slower than the ones in "mem" files. but
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| 24 | * with these routines you can mix reads and writes, or multiple writes, on
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| 25 | * the array of chars at the same time and guarantee them to work, also you
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| 26 | * can seek to a point and do a write. The decode and encode macros cannot
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| 27 | * detect when the end off the character is reached and just continue
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| 28 | * processing.
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| 29 | *
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| 30 | *
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| 31 | **************************************************************************/
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| 32 |
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| 33 | #ifndef H_BITIO_M_RANDOM
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| 34 | #define H_BITIO_M_RANDOM
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| 35 |
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| 36 | #include "longlong.h"
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| 37 | #include "bitio_m_abstract.h"
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| 38 |
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| 39 |
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| 40 | class random_bitio_buffer : public bitio_buffer {
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| 41 | public:
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| 42 | FILE *file;
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| 43 | unsigned char *buffer;
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| 44 | unsigned long base;
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| 45 | unsigned long used;
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| 46 | unsigned long pos;
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| 47 | unsigned long len;
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| 48 | unsigned long shift;
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| 49 | void writeRead();
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| 50 |
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| 51 | random_bitio_buffer(FILE *f = 0,
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| 52 | unsigned long length = 8*1024);
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| 53 | virtual ~random_bitio_buffer();
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| 54 |
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| 55 | void attachFile (FILE *f, unsigned long length);
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| 56 |
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| 57 | random_bitio_buffer &operator= (const random_bitio_buffer &_rbb);
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| 58 |
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| 59 | void encodeDone();
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| 60 | void encodeBit(int b);
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| 61 | void flush();
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| 62 | unsigned long tell();
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| 63 |
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| 64 | void seek(unsigned long topos);
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| 65 | void error();
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| 66 | long add00(long b);
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| 67 | long addff(long b);
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| 68 | int bit();
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| 69 | int bitOffset();
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| 70 | void done();
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| 71 |
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| 72 | #ifdef USE_LONG_LONG
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| 73 | // extras for longlong.h
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| 74 | void seek_LL(mg_ullong pos);
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| 75 | mg_ullong tell_LL();
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| 76 | #endif
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| 77 | };
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| 78 |
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| 79 |
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| 80 | /*#define ENCODE_START(f,l) \
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| 81 | { \
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| 82 | random_bitio_buffer buffer(f, l);
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| 83 |
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| 84 | #define ENCODE_CONTINUE(b) \
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| 85 | { \
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| 86 | random_bitio_buffer buffer; \
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| 87 | buffer.unpause(b);
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| 88 |
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| 89 | #define SEEK fprintf(stderr, "Seek to %d\n",buffer.base)
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| 90 | #define READ fprintf(stderr, "Read of %d\n",buffer.len)
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| 91 | #define WRITE fprintf(stderr, "Write of %d\n",buffer.used)
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| 92 |
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| 93 | #define WRITE_READ buffer.writeRead()
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| 94 |
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| 95 | #define ENCODE_PAUSE(b) buffer.pause(&b);}
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| 96 |
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| 97 | #define ENCODE_FLUSH buffer.flush();
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| 98 |
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| 99 | #define ENCODE_DONE buffer.done();}
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| 100 |
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| 101 | #define DECODE_START(f,l) \
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| 102 | { \
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| 103 | random_bitio_buffer buffer(f, l);
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| 104 |
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| 105 | #define DECODE_CONTINUE(b) \
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| 106 | { \
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| 107 | random_bitio_buffer buffer; \
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| 108 | buffer.unpause(b);
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| 109 |
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| 110 | #define DECODE_BIT buffer.bit()
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| 111 |
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| 112 | #define DECODE_ADD_FF(b) b = buffer.addff(b)
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| 113 |
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| 114 | #define DECODE_ADD_00(b) b = buffer.add00(b)
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| 115 |
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| 116 | #define DECODE_DONE buffer.done();}
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| 117 |
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| 118 | #define DECODE_PAUSE(b) buffer.pause(&b);}
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| 119 |
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| 120 | #define ENCODE_TELL buffer.tell()
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| 121 |
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| 122 | #define DECODE_TELL buffer.tell()
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| 123 | */
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| 124 |
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| 125 |
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| 126 |
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| 127 | #endif
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