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1 /*
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2 * Copyright (c) 2000 Yuki Sawada
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3 * All rights reserved.
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4 *
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5 * Redistribution and use in source and binary forms, with or without
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6 * modification, are permitted provided that the following conditions
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7 * are met:
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8 * 1. Redistributions of source code must retain the above copyright
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9 * notice, this list of conditions and the following disclaimer.
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10 * 2. Redistributions in binary form must reproduce the above copyright
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11 * notice, this list of conditions and the following disclaimer in the
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12 * documentation and/or other materials provided with the distribution.
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13 * 3. The name of the author may not be used to endorse or promote products
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14 * derived from this software without specific prior written permission.
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15 *
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16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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26 */
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27
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28 #include "codeconv.h"
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29 #include "codeconv_tbl.h"
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30
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31 static unsigned int
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32 codeconv_euc_to_jis(unsigned int euc)
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33 {
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34 unsigned int hi, low;
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35
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36 hi = (euc >> 8) & 0xff;
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37 low = euc & 0xff;
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38
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39 if (hi < 0x81) {
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40 hi = 0;
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41 } else if (low == 0x8e)
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42 hi = 0;
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43 else {
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44 hi -= 0x80;
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45 low -= 0x80;
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46 }
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47
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48 return (hi << 8) | low;
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49 }
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50
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51 static unsigned int
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52 codeconv_jis_to_unicode(unsigned int jis)
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53 {
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54 int k0, k1;
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55
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56 if (jis < 0x80) return jis; // ASCII
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57 k0 = (jis >> 8) - 0x20;
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58 if (k0 < 1 || k0 > 92)
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59 return 0;
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60
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61 k1 = (jis % 0x100) - 0x20;
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62 if (k1 < 1 || k1 > 94)
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63 return 0;
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64
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65 return unicode_tbl[k0 - 1][k1 - 1];
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66 }
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67
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68 unsigned int
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69 codeconv_euc_to_unicode(unsigned int euc)
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70 {
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71 unsigned int jis, unicode;
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72
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73 jis = codeconv_euc_to_jis(euc);
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74 unicode = codeconv_jis_to_unicode(jis);
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75
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76 return unicode;
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77 }
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78
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79 static unsigned int
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80 codeconv_unicode_to_jis(unsigned int unicode)
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81 {
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82 int k0, k1;
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83 unsigned int jis;
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84
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85 k0 = (unicode >> 8) & 0xff;
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86 k1 = unicode & 0xff;
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87 jis = unicode_rev_table[k0][k1];
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88
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89 return jis;
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90 }
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91
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92 static unsigned int
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93 codeconv_jis_to_euc(unsigned int jis)
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94 {
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95 unsigned int hi, low;
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96
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97 hi = (jis >> 8) & 0x7f | 0x80;
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98 low = jis & 0x7f | 0x80;
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99
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100 return (hi << 8) | low;
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101 }
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102
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103 unsigned int
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104 codeconv_unicode_to_euc(unsigned int unicode)
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105 {
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106 unsigned int jis, euc;
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107
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108 if (unicode >= 0xff61 && unicode <= 0xff9f)
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109 return unicode - 0xff61 + 0x8ea1;
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110
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111 jis = codeconv_unicode_to_jis(unicode);
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112 if (jis == 0)
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113 return 0x7878;
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114 euc = codeconv_jis_to_euc(jis);
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115
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116 return euc;
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117 }
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118
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119 static unsigned int
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120 codeconv_jis_to_sjis(unsigned int jis)
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121 {
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122 unsigned int hi, low;
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123
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124 hi = (jis >> 8) & 0xff;
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125 low = jis & 0xff;
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126
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127 low += (hi & 0x01) ? 0x1f : 0x7d;
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128 if (low >= 0x7f)
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129 low++;
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130 hi = ((hi - 0x21) >> 1) + 0x81;
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131 if (hi > 0x9f)
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132 hi += 0x40;
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133
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134 return (hi << 8) | low;
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135 }
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136
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137 unsigned int
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138 codeconv_euc_to_sjis(unsigned int euc)
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139 {
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140 unsigned int jis, sjis;
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141
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142 jis = codeconv_euc_to_jis(euc);
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143 sjis = codeconv_jis_to_sjis(jis);
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144
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145 return sjis;
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146 }
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147
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148 static unsigned int
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149 codeconv_sjis_to_jis(unsigned int sjis)
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150 {
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151 unsigned int hi, low;
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152
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153 hi = (sjis >> 8) & 0xff;
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154 low = sjis & 0xff;
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155
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156 hi -= (hi <= 0x9f) ? 0x71 : 0xb1;
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157 hi = (hi << 1) + 1;
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158 if (low > 0x7f)
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159 low--;
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160 if (low >= 0x9e) {
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161 low -= 0x7d;
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162 hi++;
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163 } else
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164 low -= 0x1f;
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165
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166 return (hi << 8) | low;
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167 }
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168
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169 unsigned int
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170 codeconv_sjis_to_euc(unsigned int sjis)
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171 {
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172 unsigned int jis, euc;
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173
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174 jis = codeconv_sjis_to_jis(sjis);
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175 euc = codeconv_jis_to_euc(jis);
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176
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177 return euc;
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178 }
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179
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180 unsigned int
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181 codeconv_euc_to_latin1(unsigned int euc)
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182 {
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183 int high = (euc>>8) & 0xff;
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184 if (high) return 0;
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185 return euc & 0xff;
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186 }
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