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_stdio.h"
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5 |
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6 | stdio_bitio_buffer::stdio_bitio_buffer(FILE *f) {
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7 | attachFile (f);
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8 | }
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9 |
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10 | void stdio_bitio_buffer::attachFile (FILE *f) {
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11 | file = f;
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12 | buffer = 0;
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13 | btg = 0;
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14 | bytesWritten = 0;
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15 | }
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16 |
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17 | void stdio_bitio_buffer::encodeStart() {
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18 | btg = sizeof(buffer) * 8;
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19 | }
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20 |
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21 | void stdio_bitio_buffer::error() {
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22 | fprintf(stderr, "Unexpected EOF in \"%s\" on line %d", __FILE__, __LINE__);
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23 | exit(1);
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24 | }
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25 |
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26 | void stdio_bitio_buffer::seek (unsigned long byte, unsigned char bit) {
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27 | if (fseek (file, byte, SEEK_SET) != 0) return;
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28 | buffer = getc(file);
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29 | btg = bit;
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30 | bytesWritten = 0;
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31 | }
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32 |
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33 | void stdio_bitio_buffer::seek(unsigned long topos) {
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34 | if (fseek(file, topos >> 3, SEEK_SET) != 0) return;
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35 | buffer = getc(file);
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36 | btg = 8 - (topos & 0x07);
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37 | bytesWritten = 0;
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38 | }
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39 |
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40 | long stdio_bitio_buffer::addff(long b)
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41 | {
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42 | if (!btg)
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43 | {
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44 | register int val;
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45 | val = getc(file);
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46 | if (val == EOF)
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47 | {
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48 | buffer = 0x0ff;
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49 | }
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50 | else
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51 | {
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52 | buffer = val;
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53 | }
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54 | btg = sizeof(buffer) * 8;
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55 | }
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56 | b = b + b + ((buffer >> --btg) & 0x01);
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57 |
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58 | return b;
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59 | }
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60 |
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61 | long stdio_bitio_buffer::add00(long b)
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62 | {
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63 | if (!btg)
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64 | {
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65 | register int val;
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66 | val = getc(file);
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67 | if (val == EOF)
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68 | {
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69 | buffer = 0xff;
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70 | }
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71 | else
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72 | {
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73 | buffer = val;
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74 | }
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75 | btg = sizeof(buffer) * 8;
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76 | }
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77 | b = b + b + ((buffer >> --btg) & 0x01);
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78 |
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79 | return b;
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80 | }
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81 |
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82 | void stdio_bitio_buffer::encodeBit(int b)
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83 | {
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84 | --btg;
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85 | if (b != 0)
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86 | buffer |= (1 << btg);
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87 |
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88 | if (btg == 0)
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89 | {
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90 | putc(buffer, file);
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91 | bytesWritten += sizeof (buffer);
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92 | buffer = 0;
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93 | btg = sizeof(buffer)*8;
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94 | }
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95 | }
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96 |
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97 | int stdio_bitio_buffer::bit()
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98 | {
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99 | if (btg == 0)
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100 | {
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101 | buffer = getc(file);
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102 | if (feof(file))
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103 | {
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104 | error();
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105 | return 0;
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106 | }
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107 | else
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108 | {
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109 | btg = sizeof(buffer) * 8;
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110 | }
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111 | }
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112 | return ((buffer >> --btg) & 0x01);
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113 | }
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114 |
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115 | void stdio_bitio_buffer::done() {
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116 | // no tidying required
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117 | }
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118 |
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119 | void stdio_bitio_buffer::encodeDone() {
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120 | if (btg != sizeof(buffer) * 8) {
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121 | putc(buffer, file);
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122 | bytesWritten += sizeof (buffer);
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123 | }
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124 | }
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125 |
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