Thu, 13 Mar 2014 00:09:23 +0100
Merge release-2.x.y
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1 | /* |
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2 | * (C) Copyright 2008-2009 Jakub Zawadzki <darkjames@darkjames.ath.cx> |
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3 | * Wojtek Kaniewski <wojtekka@irc.pl> |
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4 | * |
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5 | * This program is free software; you can redistribute it and/or modify |
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6 | * it under the terms of the GNU Lesser General Public License Version |
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7 | * 2.1 as published by the Free Software Foundation. |
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matekm and kkszysiu collaborated on this patch to update our internal libgadu
John Bailey <rekkanoryo@rekkanoryo.org>
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8 | * |
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9 | * This program is distributed in the hope that it will be useful, |
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10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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12 | * GNU Lesser General Public License for more details. |
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13 | * |
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14 | * You should have received a copy of the GNU Lesser General Public |
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15 | * License along with this program; if not, write to the Free Software |
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16 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, |
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17 | * USA. |
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18 | */ |
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19 | |
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20 | #include "strman.h" |
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21 | #include <stdlib.h> |
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22 | #include <errno.h> |
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23 | |
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24 | #include "libgadu.h" |
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25 | #include "encoding.h" |
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26 | |
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matekm and kkszysiu collaborated on this patch to update our internal libgadu
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27 | /** |
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28 | * \file encoding.c |
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29 | * |
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30 | * \brief Funkcje konwersji kodowania tekstu |
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31 | */ |
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32 | |
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33 | /** |
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34 | * \internal Tablica konwersji CP1250 na Unikod. |
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35 | */ |
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36 | static const uint16_t table_cp1250[] = |
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matekm and kkszysiu collaborated on this patch to update our internal libgadu
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37 | { |
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38 | 0x20ac, '?', 0x201a, '?', 0x201e, 0x2026, 0x2020, 0x2021, |
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39 | '?', 0x2030, 0x0160, 0x2039, 0x015a, 0x0164, 0x017d, 0x0179, |
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40 | '?', 0x2018, 0x2019, 0x201c, 0x201d, 0x2022, 0x2013, 0x2014, |
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41 | '?', 0x2122, 0x0161, 0x203a, 0x015b, 0x0165, 0x017e, 0x017a, |
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42 | 0x00a0, 0x02c7, 0x02d8, 0x0141, 0x00a4, 0x0104, 0x00a6, 0x00a7, |
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43 | 0x00a8, 0x00a9, 0x015e, 0x00ab, 0x00ac, 0x00ad, 0x00ae, 0x017b, |
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44 | 0x00b0, 0x00b1, 0x02db, 0x0142, 0x00b4, 0x00b5, 0x00b6, 0x00b7, |
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45 | 0x00b8, 0x0105, 0x015f, 0x00bb, 0x013d, 0x02dd, 0x013e, 0x017c, |
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46 | 0x0154, 0x00c1, 0x00c2, 0x0102, 0x00c4, 0x0139, 0x0106, 0x00c7, |
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47 | 0x010c, 0x00c9, 0x0118, 0x00cb, 0x011a, 0x00cd, 0x00ce, 0x010e, |
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48 | 0x0110, 0x0143, 0x0147, 0x00d3, 0x00d4, 0x0150, 0x00d6, 0x00d7, |
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49 | 0x0158, 0x016e, 0x00da, 0x0170, 0x00dc, 0x00dd, 0x0162, 0x00df, |
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50 | 0x0155, 0x00e1, 0x00e2, 0x0103, 0x00e4, 0x013a, 0x0107, 0x00e7, |
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51 | 0x010d, 0x00e9, 0x0119, 0x00eb, 0x011b, 0x00ed, 0x00ee, 0x010f, |
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52 | 0x0111, 0x0144, 0x0148, 0x00f3, 0x00f4, 0x0151, 0x00f6, 0x00f7, |
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53 | 0x0159, 0x016f, 0x00fa, 0x0171, 0x00fc, 0x00fd, 0x0163, 0x02d9, |
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54 | }; |
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matekm and kkszysiu collaborated on this patch to update our internal libgadu
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55 | |
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56 | /** |
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57 | * \internal Zamienia tekst kodowany CP1250 na UTF-8. |
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58 | * |
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59 | * \param src Tekst źródłowy w CP1250. |
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60 | * \param src_length Długość ciągu źródłowego (nigdy ujemna). |
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61 | * \param dst_length Długość ciągu docelowego (jeśli -1, nieograniczona). |
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62 | * |
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63 | * \return Zaalokowany bufor z tekstem w UTF-8. |
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64 | */ |
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65 | static char *gg_encoding_convert_cp1250_utf8(const char *src, int src_length, int dst_length) |
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66 | { |
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67 | int i, j, len; |
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68 | char *result = NULL; |
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69 | |
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70 | for (i = 0, len = 0; (src[i] != 0) && (i < src_length); i++) { |
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71 | uint16_t uc; |
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72 | |
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73 | if ((unsigned char) src[i] < 0x80) |
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74 | uc = (unsigned char) src[i]; |
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75 | else |
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76 | uc = table_cp1250[(unsigned char) src[i] - 128]; |
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77 | |
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78 | if (uc < 0x80) |
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79 | len += 1; |
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80 | else if (uc < 0x800) |
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81 | len += 2; |
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82 | else |
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83 | len += 3; |
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84 | } |
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85 | |
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86 | if ((dst_length != -1) && (len > dst_length)) |
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87 | len = dst_length; |
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88 | |
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89 | result = malloc(len + 1); |
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90 | |
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91 | if (result == NULL) |
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92 | return NULL; |
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93 | |
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94 | for (i = 0, j = 0; (src[i] != 0) && (i < src_length) && (j < len); i++) { |
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95 | uint16_t uc; |
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96 | |
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97 | if ((unsigned char) src[i] < 0x80) |
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98 | uc = (unsigned char) src[i]; |
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99 | else |
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100 | uc = table_cp1250[(unsigned char) src[i] - 128]; |
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101 | |
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102 | if (uc < 0x80) |
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103 | result[j++] = (char) uc; |
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104 | else if (uc < 0x800) { |
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105 | if (j + 1 > len) |
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106 | break; |
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107 | result[j++] = 0xc0 | ((uc >> 6) & 0x1f); |
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108 | result[j++] = 0x80 | (uc & 0x3f); |
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109 | } else { |
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110 | if (j + 2 > len) |
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111 | break; |
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112 | result[j++] = 0xe0 | ((uc >> 12) & 0x1f); |
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113 | result[j++] = 0x80 | ((uc >> 6) & 0x3f); |
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114 | result[j++] = 0x80 | (uc & 0x3f); |
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115 | } |
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116 | } |
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117 | |
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118 | result[j] = 0; |
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119 | |
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120 | return result; |
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121 | } |
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122 | |
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123 | /** |
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124 | * \internal Zamienia tekst kodowany UTF-8 na CP1250. |
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125 | * |
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126 | * \param src Tekst źródłowy w UTF-8. |
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127 | * \param src_length Długość ciągu źródłowego (nigdy ujemna). |
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128 | * \param dst_length Długość ciągu docelowego (jeśli -1, nieograniczona). |
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129 | * |
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130 | * \return Zaalokowany bufor z tekstem w CP1250. |
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131 | */ |
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132 | static char *gg_encoding_convert_utf8_cp1250(const char *src, int src_length, int dst_length) |
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133 | { |
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134 | char *result; |
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135 | int i, j, len, uc_left = 0; |
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136 | uint32_t uc = 0, uc_min = 0; |
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137 | |
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138 | for (i = 0, len = 0; (src[i] != 0) && (i < src_length); i++) { |
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139 | if ((src[i] & 0xc0) != 0x80) |
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140 | len++; |
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141 | } |
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142 | |
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143 | if ((dst_length != -1) && (len > dst_length)) |
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144 | len = dst_length; |
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145 | |
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146 | result = malloc(len + 1); |
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147 | |
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148 | if (result == NULL) |
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149 | return NULL; |
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150 | |
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151 | for (i = 0, j = 0; (src[i] != 0) && (i < src_length) && (j < len); i++) { |
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152 | if ((unsigned char) src[i] >= 0xf5) { |
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153 | if (uc_left != 0) |
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154 | result[j++] = '?'; |
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155 | /* Restricted sequences */ |
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156 | result[j++] = '?'; |
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157 | uc_left = 0; |
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158 | } else if ((src[i] & 0xf8) == 0xf0) { |
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159 | if (uc_left != 0) |
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160 | result[j++] = '?'; |
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161 | uc = src[i] & 0x07; |
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162 | uc_left = 3; |
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163 | uc_min = 0x10000; |
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164 | } else if ((src[i] & 0xf0) == 0xe0) { |
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165 | if (uc_left != 0) |
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166 | result[j++] = '?'; |
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167 | uc = src[i] & 0x0f; |
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168 | uc_left = 2; |
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169 | uc_min = 0x800; |
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170 | } else if ((src[i] & 0xe0) == 0xc0) { |
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171 | if (uc_left != 0) |
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172 | result[j++] = '?'; |
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173 | uc = src[i] & 0x1f; |
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174 | uc_left = 1; |
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175 | uc_min = 0x80; |
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176 | } else if ((src[i] & 0xc0) == 0x80) { |
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177 | if (uc_left > 0) { |
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178 | uc <<= 6; |
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179 | uc |= src[i] & 0x3f; |
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180 | uc_left--; |
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181 | |
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182 | if (uc_left == 0) { |
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183 | int valid = 0; |
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184 | int k; |
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185 | |
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186 | if (uc >= uc_min) { |
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187 | for (k = 0; k < 128; k++) { |
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188 | if (uc == table_cp1250[k]) { |
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189 | result[j++] = k + 128; |
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190 | valid = 1; |
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191 | break; |
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192 | } |
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193 | } |
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194 | } |
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195 | |
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196 | if (!valid && uc != 0xfeff) /* Byte Order Mark */ |
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197 | result[j++] = '?'; |
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198 | } |
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199 | } |
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200 | } else { |
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201 | if (uc_left != 0) { |
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202 | result[j++] = '?'; |
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203 | uc_left = 0; |
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204 | } |
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205 | result[j++] = src[i]; |
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206 | } |
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207 | } |
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208 | |
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209 | if ((uc_left != 0) && (src[i] == 0)) |
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210 | result[j++] = '?'; |
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211 | |
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212 | result[j] = 0; |
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213 | |
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214 | return result; |
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215 | } |
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216 | |
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217 | /** |
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218 | * \internal Zamienia kodowanie tekstu. |
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219 | * |
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220 | * \param src Tekst źródłowy. |
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221 | * \param src_encoding Kodowanie tekstu źródłowego. |
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222 | * \param dst_encoding Kodowanie tekstu docelowego. |
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223 | * \param src_length Długość ciągu źródłowego w bajtach (jeśli -1, zostanie obliczona na podstawie zawartości \p src). |
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224 | * \param dst_length Długość ciągu docelowego w bajtach (jeśli -1, nieograniczona). |
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225 | * |
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226 | * \return Zaalokowany bufor z tekstem w kodowaniu docelowym. |
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227 | */ |
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228 | char *gg_encoding_convert(const char *src, gg_encoding_t src_encoding, |
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229 | gg_encoding_t dst_encoding, int src_length, int dst_length) |
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230 | { |
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231 | char *result; |
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232 | |
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233 | if (src == NULL) { |
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234 | errno = EINVAL; |
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235 | return NULL; |
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236 | } |
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237 | |
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238 | /* specjalny przypadek obsługiwany ekspresowo */ |
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239 | if ((dst_encoding == src_encoding) && (dst_length == -1) && (src_length == -1)) |
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240 | return strdup(src); |
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241 | |
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242 | if (src_length == -1) |
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243 | src_length = strlen(src); |
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244 | |
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245 | if (dst_encoding == src_encoding) { |
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246 | int len; |
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247 | |
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248 | if (dst_length == -1) |
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249 | len = src_length; |
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250 | else |
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251 | len = (src_length < dst_length) ? src_length : dst_length; |
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252 | |
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253 | result = malloc(len + 1); |
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254 | |
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255 | if (result == NULL) |
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256 | return NULL; |
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257 | |
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258 | strncpy(result, src, len); |
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259 | result[len] = 0; |
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260 | |
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261 | return result; |
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262 | } |
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263 | |
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264 | if (dst_encoding == GG_ENCODING_CP1250 && src_encoding == GG_ENCODING_UTF8) |
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265 | return gg_encoding_convert_utf8_cp1250(src, src_length, dst_length); |
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266 | |
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267 | if (dst_encoding == GG_ENCODING_UTF8 && src_encoding == GG_ENCODING_CP1250) |
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268 | return gg_encoding_convert_cp1250_utf8(src, src_length, dst_length); |
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269 | |
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270 | errno = EINVAL; |
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271 | return NULL; |
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272 | } |