1 | /* |
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2 | * Copyright (c) 2003-2004, Artem B. Bityuckiy |
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3 | * Copyright (c) 1999,2000, Konstantin Chuguev. 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 | * |
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14 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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15 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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16 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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17 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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18 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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19 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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20 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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21 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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22 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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23 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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24 | * SUCH DAMAGE. |
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25 | */ |
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26 | #ifndef __ICONV_CONVERSION_H__ |
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27 | #define __ICONV_CONVERSION_H__ |
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28 | |
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29 | #include <_ansi.h> |
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30 | #include <reent.h> |
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31 | #include <sys/types.h> |
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32 | #include <wchar.h> |
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33 | |
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34 | /* Bits for 'flags' parameter of 'convert' call */ |
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35 | #define ICONV_DONT_SAVE_BIT 1 |
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36 | #define ICONV_FAIL_BIT 2 |
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37 | |
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38 | /* |
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39 | * iconv_conversion_handlers_t - keeps iconv conversion handlers. |
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40 | * |
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41 | * Keeps 6 interface function handlers: |
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42 | * open(), close(), convert(), get_mb_cur_max(), get_state(), set_state(), |
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43 | * get_mb_cur_max() and is_stateful(). Last 5 interface functions are needed to |
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44 | * support locale subsystem. |
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45 | * |
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46 | * ============================================================================ |
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47 | */ |
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48 | typedef struct |
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49 | { |
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50 | /* |
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51 | * open - open and initialize conversion. |
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52 | * |
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53 | * PARAMETERS: |
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54 | * struct _reent *rptr - reent structure of current thread/process; |
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55 | * const char *to - output encoding's normalized name; |
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56 | * const char *from - input encoding's normalized name. |
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57 | * |
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58 | * DESCRIPTION: |
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59 | * This function is called from iconv_open() to open conversion. Returns |
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60 | * a pointer to conversion-specific data. |
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61 | * |
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62 | * RETURN: |
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63 | * Pointer to conversion-specific data if success. In case of error |
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64 | * returns NULL and sets current thread's/process's errno. |
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65 | */ |
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66 | void *(*open) (struct _reent *rptr, |
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67 | const char *to, |
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68 | const char *from); |
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69 | |
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70 | /* |
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71 | * close - close conversion. |
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72 | * |
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73 | * PARAMETRS: |
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74 | * struct _reent *rptr - reent structure of current thread/process; |
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75 | * void *data - conversion-specific data. |
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76 | * |
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77 | * DESCRIPTION: |
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78 | * This function is called from iconv_close() to close conversion. |
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79 | * |
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80 | * RETURN: |
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81 | * When successful, returns (size_t)0. In case of error, sets current |
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82 | * thread's/process's errno and returns (size_t)-1 (same as iconv_open()). |
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83 | */ |
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84 | size_t (*close) (struct _reent *rptr, |
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85 | void *data); |
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86 | |
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87 | /* convert - perform encoding conversion. |
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88 | * |
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89 | * PARAMETERS: |
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90 | * struct _reent *rptr - reent structure of current thread/process. |
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91 | * void *data - conversion-specific data; |
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92 | * const unsigned char **inbuf - input data buffer; |
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93 | * size_t *inbytesleft - input buffer's length; |
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94 | * unsigned char **outbuf - output data buffer; |
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95 | * size_t *outbytesleft - output buffer free space; |
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96 | * int flags - conversion options. |
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97 | * |
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98 | * DESCRIPTION: |
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99 | * This function is called from iconv() to perform conversion and, if 'flags' |
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100 | * is 0, behaves similarly to iconv(). 'inbuf', 'inbytesleft', 'outbuf' and |
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101 | * 'outbytesleft' are same as in case of iconv() function. |
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102 | * |
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103 | * When flags & 1 isn't 0, 'outbuf' value is ignored and result isn't saved. |
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104 | * Another conversion aspects aren't changed. |
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105 | * |
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106 | * When flags & 2 isn't 0, function changes it's behavior in situations, |
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107 | * when there is no character in "to" encoding that corresponds to valid |
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108 | * character from "from" encoding. iconv() specification stands to perform |
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109 | * implimentation-spacific default conversion. If flag & 2 isn't 0, |
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110 | * function generates error. |
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111 | * |
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112 | * RETURN: |
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113 | * Returns the number of characters converted in a non-reversible way. |
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114 | * Reversible conversions are not counted. In case of error, sets current |
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115 | * thread's/process's errno and returns (size_t)-1 (same as iconv()). |
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116 | */ |
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117 | size_t (*convert) (struct _reent *rptr, |
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118 | void *data, |
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119 | const unsigned char **inbuf, |
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120 | size_t *inbytesleft, |
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121 | unsigned char **outbuf, |
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122 | size_t *outbytesleft, |
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123 | int flags); |
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124 | |
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125 | /* |
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126 | * get_state - get current shift state. |
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127 | * |
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128 | * PARAMETERS: |
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129 | * void *data - conversion-specific data; |
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130 | * mbstate_t *state - mbstate_t object where shift state will be written; |
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131 | * int direction - 0-"from", 1-"to". |
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132 | * |
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133 | * DESCRIPTION: |
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134 | * Returns encoding's current shift sequence. |
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135 | * If 'direction' is 0, "from" encoding is tested, else |
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136 | * "to" encoding is tested. |
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137 | */ |
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138 | void (*get_state) (void *data, |
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139 | mbstate_t *state, |
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140 | int direction); |
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141 | |
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142 | /* |
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143 | * set_state - set shift state. |
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144 | * |
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145 | * PARAMETERS: |
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146 | * void *data - conversion-specific data; |
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147 | * mbstate_t *state - mbstate_t object to which shift state will be set. |
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148 | * int direction - 0-"from", 1-"to". |
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149 | * |
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150 | * DESCRIPTION: |
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151 | * Sets encoding's current shift state to 'state'. if 'state' |
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152 | * object is zero-object - reset current shift state. |
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153 | * If 'direction' is 0, "from" encoding is set, else |
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154 | * "to" encoding is set. |
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155 | * Returns 0 if '*state' object has right format, -1 else. |
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156 | */ |
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157 | int (*set_state) (void *data, |
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158 | mbstate_t *state, |
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159 | int direction); |
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160 | |
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161 | /* |
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162 | * get_mb_cur_max - get maximum character length in bytes. |
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163 | * |
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164 | * PARAMETERS: |
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165 | * void *data - conversion-specific data; |
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166 | * int direction - 0-"from", 1-"to". |
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167 | * |
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168 | * DESCRIPTION: |
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169 | * Returns encoding's maximum character length. |
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170 | * If 'direction' is 0, "from" encoding is tested, else |
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171 | * "to" encoding is tested. |
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172 | */ |
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173 | int (*get_mb_cur_max) (void *data, |
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174 | int direction); |
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175 | |
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176 | /* |
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177 | * is_stateful - is encoding stateful or stateless. |
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178 | * |
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179 | * PARAMETERS: |
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180 | * void *data - conversion-specific data; |
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181 | * int direction - 0-"from", 1-"to". |
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182 | * |
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183 | * DESCRIPTION: |
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184 | * Returns 0 if encoding is stateless and 1 if stateful. |
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185 | * If 'direction' is 0, "from" encoding is tested, else |
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186 | * "to" encoding is tested. |
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187 | */ |
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188 | int (*is_stateful) (void *data, |
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189 | int direction); |
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190 | |
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191 | } iconv_conversion_handlers_t; |
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192 | |
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193 | |
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194 | /* |
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195 | * iconv_conversion_t - iconv conversion definition structure. |
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196 | * |
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197 | * ============================================================================ |
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198 | */ |
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199 | typedef struct |
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200 | { |
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201 | /* Iconv conversion handlers. */ |
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202 | const iconv_conversion_handlers_t *handlers; |
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203 | |
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204 | /* |
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205 | * Conversion-specific data (e.g., points to iconv_ucs_conversion_t |
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206 | * object if UCS-based conversion is used). |
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207 | */ |
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208 | void *data; |
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209 | } iconv_conversion_t; |
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210 | |
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211 | |
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212 | /* UCS-based conversion handlers */ |
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213 | extern const iconv_conversion_handlers_t |
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214 | _iconv_ucs_conversion_handlers; |
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215 | |
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216 | /* Null conversion handlers */ |
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217 | extern const iconv_conversion_handlers_t |
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218 | _iconv_null_conversion_handlers; |
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219 | |
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220 | #endif /* !__ICONV_CONVERSION_H__ */ |
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221 | |
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