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Rev | Author | Line No. | Line |
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3540 | clevermous | 1 | ; fetch the UTF-8 character in string+offs to char |
2 | ; common part for all encodings: translate pseudographics |
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3 | ; Pseudographics for the boot screen: |
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4 | ; 0x2500 -> 0xC4, 0x2502 -> 0xB3, 0x250C -> 0xDA, 0x2510 -> 0xBF, |
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5 | ; 0x2514 -> 0xC0, 0x2518 -> 0xD9, 0x252C -> 0xC2, 0x2534 -> 0xC1, 0x2551 -> 0xBA |
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6 | macro fetch_utf8_char string, offs, char, graph |
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7 | { local first_byte, b |
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8 | virtual at 0 |
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9 | db string |
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10 | if offs >= $ |
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11 | char = -1 |
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12 | else |
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13 | ; fetch first byte |
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14 | load first_byte byte from offs |
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15 | if first_byte < 0x80 |
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16 | char = first_byte |
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17 | offs = offs + 1 |
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18 | else if first_byte < 0xC0 |
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19 | .err Invalid UTF-8 string |
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20 | else if first_byte < 0xE0 |
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21 | char = first_byte and 0x1F |
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22 | load b byte from offs + 1 |
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23 | char = (char shl 6) + (b and 0x3F) |
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24 | offs = offs + 2 |
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25 | else if first_byte < 0xF0 |
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26 | char = first_byte and 0xF |
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27 | load b byte from offs + 1 |
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28 | char = (char shl 6) + (b and 0x3F) |
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29 | load b byte from offs + 2 |
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30 | char = (char shl 6) + (b and 0x3F) |
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31 | offs = offs + 3 |
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32 | else if first_byte < 0xF8 |
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33 | char = first_byte and 0x7 |
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34 | load b byte from offs + 1 |
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35 | char = (char shl 6) + (b and 0x3F) |
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36 | load b byte from offs + 2 |
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37 | char = (char shl 6) + (b and 0x3F) |
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38 | load b byte from offs + 3 |
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39 | char = (char shl 6) + (b and 0x3F) |
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40 | offs = offs + 4 |
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41 | else |
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42 | .err Invalid UTF-8 string |
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43 | end if |
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44 | end if |
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45 | end virtual |
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46 | if char = 0x2500 |
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47 | graph = 0xC4 |
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48 | else if char = 0x2502 |
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49 | graph = 0xB3 |
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50 | else if char = 0x250C |
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51 | graph = 0xDA |
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52 | else if char = 0x2510 |
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53 | graph = 0xBF |
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54 | else if char = 0x2514 |
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55 | graph = 0xC0 |
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56 | else if char = 0x2518 |
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57 | graph = 0xD9 |
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58 | else if char = 0x252C |
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59 | graph = 0xC2 |
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60 | else if char = 0x2534 |
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61 | graph = 0xC1 |
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62 | else if char = 0x2551 |
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63 | graph = 0xBA |
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64 | else |
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65 | graph = 0 |
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66 | end if |
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67 | } |
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68 | |||
69 | ; Russian: use CP866. |
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70 | ; 0x00-0x7F - trivial map |
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71 | ; 0x410-0x43F -> 0x80-0xAF |
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72 | ; 0x440-0x44F -> 0xE0-0xEF |
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73 | ; 0x401 -> 0xF0, 0x451 -> 0xF1 |
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74 | macro cp866 [arg] |
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75 | { local offs, char, graph |
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76 | offs = 0 |
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77 | while 1 |
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78 | fetch_utf8_char arg, offs, char, graph |
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79 | if char = -1 |
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80 | break |
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81 | end if |
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82 | if graph |
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83 | db graph |
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84 | else if char < 0x80 |
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85 | db char |
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86 | else if char = 0x401 |
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87 | db 0xF0 |
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88 | else if char = 0x451 |
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89 | db 0xF1 |
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90 | else if (char < 0x410) | (char > 0x44F) |
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91 | .err Failed to convert to CP866 |
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92 | else if char < 0x440 |
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93 | db char - 0x410 + 0x80 |
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94 | else |
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95 | db char - 0x440 + 0xE0 |
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96 | end if |
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97 | end while |
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98 | } |
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99 | |||
100 | ; Latin-1 encoding |
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101 | ; 0x00-0xFF - trivial map |
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102 | macro latin1 [arg] |
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103 | { local offs, char, graph |
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104 | offs = 0 |
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105 | while 1 |
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106 | fetch_utf8_char arg, offs, char, graph |
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107 | if char = -1 |
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108 | break |
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109 | end if |
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110 | if graph |
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111 | db graph |
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112 | else if char < 0x100 |
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113 | db char |
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114 | else |
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115 | .err Failed to convert to Latin-1 |
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116 | end if |
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117 | end while |
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118 | } |
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119 | |||
120 | ; CP850 encoding |
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121 | macro cp850 [arg] |
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122 | { local offs, char, graph |
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123 | offs = 0 |
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124 | while 1 |
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125 | fetch_utf8_char arg, offs, char, graph |
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126 | if char = -1 |
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127 | break |
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128 | end if |
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129 | if graph |
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130 | db graph |
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131 | else if char < 0x80 |
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132 | db char |
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133 | else if char = 0xBF |
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134 | db 0xA8 |
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135 | else if char = 0xE1 |
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136 | db 0xA0 |
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137 | else if char = 0xE9 |
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138 | db 0x82 |
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139 | else if char = 0xED |
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140 | db 0xA1 |
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141 | else if char = 0xF3 |
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142 | db 0xA2 |
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143 | else if char = 0xFA |
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144 | db 0xA3 |
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145 | else |
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146 | err Failed to convert to CP850 |
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147 | end if |
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148 | end while |
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149 | }>>>>>>>>>> |