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70
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1 /* Header for code conversion stuff
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2 Copyright (C) 1991, 1995 Free Software Foundation, Inc.
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3 Copyright (C) 1995 Sun Microsystems, Inc.
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4
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5 This file is part of XEmacs.
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6
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7 XEmacs is free software; you can redistribute it and/or modify it
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8 under the terms of the GNU General Public License as published by the
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9 Free Software Foundation; either version 2, or (at your option) any
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10 later version.
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11
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12 XEmacs is distributed in the hope that it will be useful, but WITHOUT
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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15 for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with XEmacs; see the file COPYING. If not, write to
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19 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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20 Boston, MA 02111-1307, USA. */
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21
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22 /* Synched up with: Mule 2.3. Not in FSF. */
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23
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24 /* 91.10.09 written by K.Handa <handa@etl.go.jp> */
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25 /* Rewritten by Ben Wing <wing@666.com>. */
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26
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27 #ifndef _XEMACS_MULE_CODING_H_
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28 #define _XEMACS_MULE_CODING_H_
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29
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30 struct decoding_stream;
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31 struct encoding_stream;
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32
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33 /* Coding system types. These go into the TYPE field of a
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34 struct Lisp_Coding_System. */
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35
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36 enum coding_system_type
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37 {
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38 CODESYS_AUTODETECT, /* Automatic conversion. */
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39 CODESYS_SHIFT_JIS, /* Shift-JIS; Hankaku (half-width) KANA
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40 is also supported. */
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41 CODESYS_ISO2022, /* Any ISO2022-compliant coding system.
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42 Includes JIS, EUC, CTEXT */
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43 CODESYS_BIG5, /* BIG5 (used for Taiwanese). */
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44 CODESYS_CCL, /* Converter written in CCL. */
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45 CODESYS_NO_CONVERSION /* "No conversion"; used for binary files.
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46 We use quotes because there really
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47 is some conversion being applied,
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48 but it appears to the user as if
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49 the text is read in without conversion. */
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50 #ifdef DEBUG_XEMACS
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51 ,CODESYS_INTERNAL /* Raw (internally-formatted) data. */
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52 #endif
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53 };
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54
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55 enum eol_type
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56 {
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57 EOL_AUTODETECT,
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58 EOL_LF,
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59 EOL_CRLF,
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60 EOL_CR
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61 };
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62
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63 /* This holds the current state of a running CCL program. */
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64 struct ccl_program
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65 {
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66 Lisp_Object saved_vector;
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67 Lisp_Object *prog; /* compiled code */
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68 int size; /* size of compiled code */
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69 int ic; /* instruction counter */
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70 int reg[8]; /* reg[7] is used for `condition' */
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71 int end_flag; /* set when processing the last block */
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72 int status;
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73 };
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74
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75 struct charset_conversion_spec
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76 {
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77 Lisp_Object from_charset;
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78 Lisp_Object to_charset;
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79 };
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80
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81 typedef struct charset_conversion_spec_dynarr_type
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82 {
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83 Dynarr_declare (struct charset_conversion_spec);
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84 } charset_conversion_spec_dynarr;
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85
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86 struct Lisp_Coding_System
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87 {
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88 struct lcrecord_header header;
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89
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90 /* Name and doc string of this coding system. */
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91 Lisp_Object name, doc_string;
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92
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93 /* This is the major type of the coding system -- one of Big5, ISO2022,
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94 Shift-JIS, etc. See the constants above. */
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95 enum coding_system_type type;
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96
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97 /* Mnemonic string displayed in the modeline when this coding
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98 system is active for a particular buffer. */
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99 Lisp_Object mnemonic;
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100
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101 Lisp_Object post_read_conversion, pre_write_conversion;
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102
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103 enum eol_type eol_type;
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104
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105 /* Subsidiary coding systems that specify a particular type of EOL
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106 marking, rather than autodetecting it. These will only be non-nil
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107 if (eol_type == EOL_AUTODETECT). */
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108 Lisp_Object eol_lf, eol_crlf, eol_cr;
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109
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110 struct
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111 {
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112 /* What are the charsets to be initially designated to G0, G1,
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113 G2, G3? If t, no charset is initially designated. If nil,
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114 no charset is initially designated and no charset is allowed
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115 to be designated. */
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116 Lisp_Object initial_charset[4];
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117
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118 /* If true, a designation escape sequence needs to be sent on output
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119 for the charset in G[0-3] before that charset is used. */
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120 unsigned char force_charset_on_output[4];
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121
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122 charset_conversion_spec_dynarr *input_conv;
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123 charset_conversion_spec_dynarr *output_conv;
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124
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125 unsigned int shoort :1; /* C makes you speak Dutch */
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126 unsigned int no_ascii_eol :1;
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127 unsigned int no_ascii_cntl :1;
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128 unsigned int seven :1;
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129 unsigned int lock_shift :1;
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130 unsigned int no_iso6429 :1;
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131 unsigned int escape_quoted :1;
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132 } iso2022;
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133
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134 struct
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135 {
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136 /* For a CCL coding system, these specify the CCL programs used for
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137 decoding (input) and encoding (output). */
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138 Lisp_Object decode, encode;
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139 } ccl;
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140 };
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141
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142 DECLARE_LRECORD (coding_system, struct Lisp_Coding_System);
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143 #define XCODING_SYSTEM(x) XRECORD (x, coding_system, struct Lisp_Coding_System)
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144 #define XSETCODING_SYSTEM(x, p) XSETRECORD (x, p, coding_system)
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145 #define CODING_SYSTEMP(x) RECORDP (x, coding_system)
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146 #define GC_CODING_SYSTEMP(x) GC_RECORDP (x, coding_system)
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147 #define CHECK_CODING_SYSTEM(x) CHECK_RECORD (x, coding_system)
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148 #define CONCHECK_CODING_SYSTEM(x) CONCHECK_RECORD (x, coding_system)
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149
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150 #define CODING_SYSTEM_NAME(codesys) ((codesys)->name)
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151 #define CODING_SYSTEM_DOC_STRING(codesys) ((codesys)->doc_string)
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152 #define CODING_SYSTEM_TYPE(codesys) ((codesys)->type)
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153 #define CODING_SYSTEM_MNEMONIC(codesys) ((codesys)->mnemonic)
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154 #define CODING_SYSTEM_POST_READ_CONVERSION(codesys) \
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155 ((codesys)->post_read_conversion)
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156 #define CODING_SYSTEM_PRE_WRITE_CONVERSION(codesys) \
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157 ((codesys)->pre_write_conversion)
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158 #define CODING_SYSTEM_EOL_TYPE(codesys) ((codesys)->eol_type)
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159 #define CODING_SYSTEM_EOL_LF(codesys) ((codesys)->eol_lf)
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160 #define CODING_SYSTEM_EOL_CRLF(codesys) ((codesys)->eol_crlf)
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161 #define CODING_SYSTEM_EOL_CR(codesys) ((codesys)->eol_cr)
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162 #define CODING_SYSTEM_ISO2022_INITIAL_CHARSET(codesys, g) \
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163 ((codesys)->iso2022.initial_charset[g])
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164 #define CODING_SYSTEM_ISO2022_FORCE_CHARSET_ON_OUTPUT(codesys, g) \
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165 ((codesys)->iso2022.force_charset_on_output[g])
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166 #define CODING_SYSTEM_ISO2022_SHORT(codesys) ((codesys)->iso2022.shoort)
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167 #define CODING_SYSTEM_ISO2022_NO_ASCII_EOL(codesys) \
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168 ((codesys)->iso2022.no_ascii_eol)
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169 #define CODING_SYSTEM_ISO2022_NO_ASCII_CNTL(codesys) \
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170 ((codesys)->iso2022.no_ascii_cntl)
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171 #define CODING_SYSTEM_ISO2022_SEVEN(codesys) ((codesys)->iso2022.seven)
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172 #define CODING_SYSTEM_ISO2022_LOCK_SHIFT(codesys) \
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173 ((codesys)->iso2022.lock_shift)
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174 #define CODING_SYSTEM_ISO2022_NO_ISO6429(codesys) \
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175 ((codesys)->iso2022.no_iso6429)
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176 #define CODING_SYSTEM_ISO2022_ESCAPE_QUOTED(codesys) \
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177 ((codesys)->iso2022.escape_quoted)
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178 #define CODING_SYSTEM_CCL_DECODE(codesys) ((codesys)->ccl.decode)
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179 #define CODING_SYSTEM_CCL_ENCODE(codesys) ((codesys)->ccl.encode)
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180
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181 #define XCODING_SYSTEM_NAME(codesys) \
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182 CODING_SYSTEM_NAME (XCODING_SYSTEM (codesys))
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183 #define XCODING_SYSTEM_DOC_STRING(codesys) \
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184 CODING_SYSTEM_DOC_STRING (XCODING_SYSTEM (codesys))
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185 #define XCODING_SYSTEM_TYPE(codesys) \
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186 CODING_SYSTEM_TYPE (XCODING_SYSTEM (codesys))
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187 #define XCODING_SYSTEM_MNEMONIC(codesys) \
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188 CODING_SYSTEM_MNEMONIC (XCODING_SYSTEM (codesys))
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189 #define XCODING_SYSTEM_POST_READ_CONVERSION(codesys) \
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190 CODING_SYSTEM_POST_READ_CONVERSION (XCODING_SYSTEM (codesys))
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191 #define XCODING_SYSTEM_PRE_WRITE_CONVERSION(codesys) \
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192 CODING_SYSTEM_PRE_WRITE_CONVERSION (XCODING_SYSTEM (codesys))
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193 #define XCODING_SYSTEM_EOL_TYPE(codesys) \
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194 CODING_SYSTEM_EOL_TYPE (XCODING_SYSTEM (codesys))
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195 #define XCODING_SYSTEM_EOL_LF(codesys) \
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196 CODING_SYSTEM_EOL_LF (XCODING_SYSTEM (codesys))
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197 #define XCODING_SYSTEM_EOL_CRLF(codesys) \
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198 CODING_SYSTEM_EOL_CRLF (XCODING_SYSTEM (codesys))
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199 #define XCODING_SYSTEM_EOL_CR(codesys) \
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200 CODING_SYSTEM_EOL_CR (XCODING_SYSTEM (codesys))
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201 #define XCODING_SYSTEM_ISO2022_INITIAL_CHARSET(codesys, g) \
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202 CODING_SYSTEM_ISO2022_INITIAL_CHARSET (XCODING_SYSTEM (codesys), g)
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203 #define XCODING_SYSTEM_ISO2022_FORCE_CHARSET_ON_OUTPUT(codesys, g) \
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204 CODING_SYSTEM_ISO2022_FORCE_CHARSET_ON_OUTPUT (XCODING_SYSTEM (codesys), g)
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205 #define XCODING_SYSTEM_ISO2022_SHORT(codesys) \
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206 CODING_SYSTEM_ISO2022_SHORT (XCODING_SYSTEM (codesys))
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207 #define XCODING_SYSTEM_ISO2022_NO_ASCII_EOL(codesys) \
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208 CODING_SYSTEM_ISO2022_NO_ASCII_EOL (XCODING_SYSTEM (codesys))
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209 #define XCODING_SYSTEM_ISO2022_NO_ASCII_CNTL(codesys) \
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210 CODING_SYSTEM_ISO2022_NO_ASCII_CNTL (XCODING_SYSTEM (codesys))
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211 #define XCODING_SYSTEM_ISO2022_SEVEN(codesys) \
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212 CODING_SYSTEM_ISO2022_SEVEN (XCODING_SYSTEM (codesys))
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213 #define XCODING_SYSTEM_ISO2022_LOCK_SHIFT(codesys) \
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214 CODING_SYSTEM_ISO2022_LOCK_SHIFT (XCODING_SYSTEM (codesys))
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215 #define XCODING_SYSTEM_ISO2022_NO_ISO6429(codesys) \
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216 CODING_SYSTEM_ISO2022_NO_ISO6429 (XCODING_SYSTEM (codesys))
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217 #define XCODING_SYSTEM_ISO2022_ESCAPE_QUOTED(codesys) \
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218 CODING_SYSTEM_ISO2022_ESCAPE_QUOTED (XCODING_SYSTEM (codesys))
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219 #define XCODING_SYSTEM_CCL_DECODE(codesys) \
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220 CODING_SYSTEM_CCL_DECODE (XCODING_SYSTEM (codesys))
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221 #define XCODING_SYSTEM_CCL_ENCODE(codesys) \
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222 CODING_SYSTEM_CCL_ENCODE (XCODING_SYSTEM (codesys))
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223
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224 extern Lisp_Object Qfile_coding_system, Qcoding_system_error;
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225
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226 extern Lisp_Object Vkeyboard_coding_system;
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227 extern Lisp_Object Vterminal_coding_system;
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228 extern Lisp_Object Vprocess_input_coding_system;
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229 extern Lisp_Object Vprocess_output_coding_system;
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230 extern Lisp_Object Vpathname_coding_system;
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231
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232 extern Lisp_Object Qescape_quoted;
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233
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234 /* Flags indicating current state while converting code. */
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235
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236 /* Used by everyone. */
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237
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238 #define CODING_STATE_END (1 << 0) /* If set, this is the last chunk of
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239 data being processed. When this
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240 is finished, output any necessary
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241 terminating control characters,
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242 escape sequences, etc. */
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243 #define CODING_STATE_CR (1 << 1) /* If set, we just saw a CR. */
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244
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245
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246 /* Used by Big 5 on output. */
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247
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248 #define CODING_STATE_BIG5_1 (1 << 2) /* If set, we just encountered
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249 LEADING_BYTE_BIG5_1. */
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250 #define CODING_STATE_BIG5_2 (1 << 3) /* If set, we just encountered
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251 LEADING_BYTE_BIG5_2. */
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252
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253
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254 /* Used by ISO2022 on input and output. */
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255
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256 #define CODING_STATE_R2L (1 << 4) /* If set, the current
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257 directionality is right-to-left.
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258 Otherwise, it's left-to-right. */
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259
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260
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261 /* Used by ISO2022 on input. */
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262
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263 #define CODING_STATE_ESCAPE (1 << 5) /* If set, we're currently parsing
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264 an escape sequence and the upper
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265 16 bits should be looked at to
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266 indicate what partial escape
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267 sequence we've seen so far.
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268 Otherwise, we're running
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269 through actual text. */
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270 #define CODING_STATE_SS2 (1 << 6) /* If set, G2 is invoked into GL, but
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271 only for the next character. */
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272 #define CODING_STATE_SS3 (1 << 7) /* If set, G3 is invoked into GL,
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273 but only for the next character.
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274 If both CODING_STATE_SS2 and
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275 CODING_STATE_SS3 are set,
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276 CODING_STATE_SS2 overrides; but
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277 this probably indicates an error
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278 in the text encoding. */
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279 #define CODING_STATE_COMPOSITE (1 << 8) /* If set, we're currently processing
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280 a composite character (i.e. a
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281 character constructed by
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282 overstriking two or more
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283 characters). */
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284
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285
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286 /* CODING_STATE_ISO2022_LOCK is the mask of flags that remain on until
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287 explicitly turned off when in the ISO2022 encoder/decoder. Other flags are
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288 turned off at the end of processing each character or escape sequence. */
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289 # define CODING_STATE_ISO2022_LOCK \
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290 (CODING_STATE_END | CODING_STATE_COMPOSITE | CODING_STATE_R2L)
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291 #define CODING_STATE_BIG5_LOCK \
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292 CODING_STATE_END
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293
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294 /* Flags indicating what we've seen so far when parsing an
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295 ISO2022 escape sequence. */
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296 enum iso_esc_flag
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297 {
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298 /* Partial sequences */
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299 ISO_ESC_NOTHING, /* Nothing has been seen. */
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300 ISO_ESC, /* We've seen ESC. */
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301 ISO_ESC_2_4, /* We've seen ESC $. This indicates
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302 that we're designating a multi-byte, rather
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303 than a single-byte, character set. */
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304 ISO_ESC_2_8, /* We've seen ESC 0x28, i.e. ESC (.
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305 This means designate a 94-character
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306 character set into G0. */
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307 ISO_ESC_2_9, /* We've seen ESC 0x29 -- designate a
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308 94-character character set into G1. */
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309 ISO_ESC_2_10, /* We've seen ESC 0x2A. */
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310 ISO_ESC_2_11, /* We've seen ESC 0x2B. */
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311 ISO_ESC_2_12, /* We've seen ESC 0x2C -- designate a
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312 96-character character set into G0.
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313 (This is not ISO2022-standard.
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314 The following 96-character
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315 control sequences are standard,
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316 though.) */
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317 ISO_ESC_2_13, /* We've seen ESC 0x2D -- designate a
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318 96-character character set into G1.
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319 */
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320 ISO_ESC_2_14, /* We've seen ESC 0x2E. */
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321 ISO_ESC_2_15, /* We've seen ESC 0x2F. */
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322 ISO_ESC_2_4_8, /* We've seen ESC $ 0x28 -- designate
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323 a 94^N character set into G0. */
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324 ISO_ESC_2_4_9, /* We've seen ESC $ 0x29. */
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325 ISO_ESC_2_4_10, /* We've seen ESC $ 0x2A. */
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326 ISO_ESC_2_4_11, /* We've seen ESC $ 0x2B. */
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327 ISO_ESC_2_4_12, /* We've seen ESC $ 0x2C. */
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328 ISO_ESC_2_4_13, /* We've seen ESC $ 0x2D. */
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329 ISO_ESC_2_4_14, /* We've seen ESC $ 0x2E. */
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330 ISO_ESC_2_4_15, /* We've seen ESC $ 0x2F. */
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331 ISO_ESC_5_11, /* We've seen ESC [ or 0x9B. This
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332 starts a directionality-control
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333 sequence. The next character
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334 must be 0, 1, 2, or ]. */
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335 ISO_ESC_5_11_0, /* We've seen 0x9B 0. The next
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336 character must be ]. */
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337 ISO_ESC_5_11_1, /* We've seen 0x9B 1. The next
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338 character must be ]. */
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339 ISO_ESC_5_11_2, /* We've seen 0x9B 2. The next
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340 character must be ]. */
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341
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342 /* Full sequences. */
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343 ISO_ESC_START_COMPOSITE, /* Private usage for START COMPOSING */
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344 ISO_ESC_END_COMPOSITE, /* Private usage for END COMPOSING */
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345 ISO_ESC_SINGLE_SHIFT, /* We've seen a complete single-shift sequence. */
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346 ISO_ESC_LOCKING_SHIFT,/* We've seen a complete locking-shift sequence. */
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347 ISO_ESC_DESIGNATE, /* We've seen a complete designation sequence. */
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348 ISO_ESC_DIRECTIONALITY,/* We've seen a complete ISO6429 directionality
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349 sequence. */
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350 ISO_ESC_LITERAL /* We've seen a literal character ala
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351 escape-quoting. */
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352 };
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353
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354 /* Macros to define code of control characters for ISO2022's functions. */
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355 /* code */ /* function */
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356 #define ISO_CODE_LF 0x0A /* line-feed */
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357 #define ISO_CODE_CR 0x0D /* carriage-return */
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358 #define ISO_CODE_SO 0x0E /* shift-out */
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359 #define ISO_CODE_SI 0x0F /* shift-in */
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360 #define ISO_CODE_ESC 0x1B /* escape */
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361 #define ISO_CODE_DEL 0x7F /* delete */
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362 #define ISO_CODE_SS2 0x8E /* single-shift-2 */
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363 #define ISO_CODE_SS3 0x8F /* single-shift-3 */
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364 #define ISO_CODE_CSI 0x9B /* control-sequence-introduce */
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365
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366 /* Macros to access an encoding stream or decoding stream */
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367
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368 #define CODING_STREAM_DECOMPOSE(str, flags, ch) \
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369 do { \
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370 flags = (str)->flags; \
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371 ch = (str)->ch; \
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372 } while (0)
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373
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374 #define CODING_STREAM_COMPOSE(str, flags, ch) \
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375 do { \
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376 (str)->flags = flags; \
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377 (str)->ch = ch; \
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378 } while (0)
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379
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380
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381 /* For detecting the encoding of text */
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382 enum coding_category_type
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383 {
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384 CODING_CATEGORY_SHIFT_JIS,
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385 CODING_CATEGORY_ISO_7, /* ISO2022 system using only seven-bit bytes,
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386 no locking shift */
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387 CODING_CATEGORY_ISO_8_DESIGNATE, /* ISO2022 system using eight-bit bytes,
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388 no locking shift, no single shift,
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389 using designation to switch charsets */
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390 CODING_CATEGORY_ISO_8_1, /* ISO2022 system using eight-bit bytes,
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391 no locking shift, no designation sequences,
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392 one-dimension characters in the upper half. */
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393 CODING_CATEGORY_ISO_8_2, /* ISO2022 system using eight-bit bytes,
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394 no locking shift, no designation sequences,
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395 two-dimension characters in the upper half. */
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396 CODING_CATEGORY_ISO_LOCK_SHIFT, /* ISO2022 system using locking shift */
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397 CODING_CATEGORY_BIG5,
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398 CODING_CATEGORY_NO_CONVERSION
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399 };
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400
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401 #define CODING_CATEGORY_LAST CODING_CATEGORY_NO_CONVERSION
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402
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403 #define CODING_CATEGORY_SHIFT_JIS_MASK \
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404 (1 << CODING_CATEGORY_SHIFT_JIS)
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405 #define CODING_CATEGORY_ISO_7_MASK \
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406 (1 << CODING_CATEGORY_ISO_7)
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407 #define CODING_CATEGORY_ISO_8_DESIGNATE_MASK \
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408 (1 << CODING_CATEGORY_ISO_8_DESIGNATE)
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409 #define CODING_CATEGORY_ISO_8_1_MASK \
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410 (1 << CODING_CATEGORY_ISO_8_1)
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411 #define CODING_CATEGORY_ISO_8_2_MASK \
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412 (1 << CODING_CATEGORY_ISO_8_2)
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413 #define CODING_CATEGORY_ISO_LOCK_SHIFT_MASK \
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414 (1 << CODING_CATEGORY_ISO_LOCK_SHIFT)
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415 #define CODING_CATEGORY_BIG5_MASK \
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416 (1 << CODING_CATEGORY_BIG5)
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417 #define CODING_CATEGORY_NO_CONVERSION_MASK \
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418 (1 << CODING_CATEGORY_NO_CONVERSION)
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419 #define CODING_CATEGORY_NOT_FINISHED_MASK \
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420 (1 << 30)
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421
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422 extern Lisp_Object make_decoding_input_stream (Lstream *stream,
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423 Lisp_Object codesys);
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424 extern Lisp_Object make_encoding_input_stream (Lstream *stream,
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425 Lisp_Object codesys);
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426 extern Lisp_Object make_decoding_output_stream (Lstream *stream,
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427 Lisp_Object codesys);
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428 extern Lisp_Object make_encoding_output_stream (Lstream *stream,
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429 Lisp_Object codesys);
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430 extern Lisp_Object decoding_stream_coding_system (Lstream *stream);
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431 extern Lisp_Object encoding_stream_coding_system (Lstream *stream);
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432 extern void set_decoding_stream_coding_system (Lstream *stream,
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433 Lisp_Object codesys);
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434 extern void set_encoding_stream_coding_system (Lstream *stream,
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435 Lisp_Object codesys);
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436
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437 /* In mule-ccl.c */
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438 int ccl_driver (struct ccl_program *ccl, CONST unsigned char *src,
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439 unsigned_char_dynarr *dst, int n, int end_flag);
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440 void set_ccl_program (struct ccl_program *ccl, Lisp_Object val, int *regs,
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441 int numregs, int initial_ic);
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442
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443 #endif /* _XEMACS_MULE_CODING_H_ */
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