1 | #include <stdlib.h>
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2 | #include <stdio.h>
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3 |
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4 | #include "bitio_m_abstract.h"
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5 | #include "bitio_m_mem.h"
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6 |
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7 | mem_bitio_buffer::mem_bitio_buffer() {
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8 | }
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9 |
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10 | mem_bitio_buffer::mem_bitio_buffer(unsigned char *readbuffer, int size) {
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11 | pos = readbuffer;
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12 | base = readbuffer;
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13 | remaining = size;
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14 | buffer = 0;
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15 | btg = 0;
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16 | }
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17 |
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18 |
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19 | void mem_bitio_buffer::error() {
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20 | fprintf (stderr, "Unexpected EOF in \"%s\" on line %d\n", __FILE__, __LINE__);
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21 | exit(1);
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22 | }
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23 |
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24 | void mem_bitio_buffer::encodeStart() {
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25 | btg = sizeof(buffer) * 8;
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26 | }
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27 |
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28 |
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29 | void mem_bitio_buffer::seek(unsigned long toPos) {
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30 | register long _newPos;
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31 | do {
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32 | _newPos = toPos;
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33 |
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34 | pos = base + (_newPos >> 3);
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35 | buffer = *pos++;
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36 | btg = 8 - (_newPos & 0x07);
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37 | } while (0);
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38 | }
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39 |
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40 | long mem_bitio_buffer::addff(long b) {
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41 | do {
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42 | if (btg == 0) {
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43 | if (remaining != 0) {
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44 | buffer = *pos++;
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45 | remaining --;
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46 | } else {
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47 | buffer = 0xff;
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48 | }
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49 | btg = sizeof(buffer) * 8;
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50 | }
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51 | b = b + b + ((buffer >> --btg) & 1);
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52 | } while(0);
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53 |
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54 | return b;
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55 | }
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56 |
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57 | long mem_bitio_buffer::add00(long b) {
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58 | do {
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59 | if (btg == 0) {
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60 | if (remaining != 0) {
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61 | buffer = *pos++;
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62 | remaining --;
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63 | } else {
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64 | buffer = 0x00;
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65 | }
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66 | btg = sizeof(buffer) * 8;
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67 | }
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68 | b = b + b + ((buffer >> --btg) & 1);
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69 | } while(0);
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70 |
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71 | return b;
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72 | }
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73 |
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74 | int mem_bitio_buffer::bit() {
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75 | if (btg == 0) {
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76 |
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77 | if (remaining == 0) {
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78 | this->error();
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79 | return 0;
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80 |
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81 | } else {
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82 | buffer = *pos++;
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83 | remaining--;
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84 | btg = sizeof(buffer) * 8;
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85 | }
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86 |
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87 | }
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88 | return ((buffer >> --btg) & 0x01);
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89 | }
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90 |
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91 | void mem_bitio_buffer::encodeBit(int b) {
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92 | btg--;
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93 | if (b) buffer |= (1 << btg);
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94 |
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95 | if (btg == 0) {
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96 | if (remaining) {
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97 | *pos++ = buffer;
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98 | remaining--;
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99 | }
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100 | buffer = 0;
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101 | btg = sizeof(buffer)*8;
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102 | }
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103 | }
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104 |
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105 | void mem_bitio_buffer::flush() {
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106 | if (btg != sizeof(buffer)*8) {
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107 | if (remaining) {
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108 | *pos++ = buffer;
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109 | remaining--;
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110 | }
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111 | }
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112 | btg = sizeof(buffer)*8;
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113 | }
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114 |
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115 | void mem_bitio_buffer::done() {
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116 | // do nothing
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117 | }
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118 |
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119 | int mem_bitio_buffer::encodeLength() {
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120 | return pos - base;
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121 | }
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122 |
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123 | int mem_bitio_buffer::encodeVerify() {
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124 | return (remaining != 0);
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125 | }
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126 |
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127 |
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128 |
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