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Annotation of pgp/src/charset.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * charset.c
        !             3:  *
        !             4:  * Conversion tables and routines to support different character sets.
        !             5:  * The PGP internal format is latin-1.
        !             6:  */
        !             7: 
        !             8: #include <stdio.h>
        !             9: #include "usuals.h"
        !            10: #include "language.h"
        !            11: #include "fileio.h"
        !            12: 
        !            13: #ifndef NULL
        !            14: #define        NULL    0
        !            15: #endif
        !            16: 
        !            17: #define UNK    '?'
        !            18: 
        !            19: static unsigned char
        !            20: intern2ascii[] = {  /* ISO 8859-1 Latin Alphabet 1 to US ASCII */
        !            21: UNK, UNK, UNK, UNK, UNK, UNK, UNK, UNK, UNK, UNK, UNK, UNK, UNK, UNK, UNK, UNK,  
        !            22: UNK, UNK, UNK, UNK, UNK, UNK, UNK, UNK, UNK, UNK, UNK, UNK, UNK, UNK, UNK, UNK,  
        !            23:  32,  33,  99,  35,  36,  89, 124,  80,  34,  67,  97,  34, 126,  45,  82,  95,  
        !            24: 111, UNK,  50,  51,  39, 117,  45,  45,  44,  49, 111,  34, UNK, UNK, UNK,  63,  
        !            25:  65,  65,  65,  65,  65,  65,  65,  67,  69,  69,  69,  69,  73,  73,  73,  73,  
        !            26:  68,  78,  79,  79,  79,  79,  79, 120,  79,  85,  85,  85,  85,  89,  84, 115,  
        !            27:  97,  97,  97,  97,  97,  97,  97,  99, 101, 101, 101, 101, 105, 105, 105, 105,  
        !            28: 100, 110, 111, 111, 111, 111, 111,  47, 111, 117, 117, 117, 117, 121, 116, 121 
        !            29: };
        !            30: 
        !            31: static unsigned char
        !            32: intern2cp850[] = {  /* ISO 8859-1 Latin Alphabet 1 (Latin-1) to IBM Code Page 850 */
        !            33: 186, 205, 201, 187, 200, 188, 204, 185, 203, 202, 206, 223, 220, 219, 254, 242,
        !            34: 179, 196, 218, 191, 192, 217, 195, 180, 194, 193, 197, 176, 177, 178, 213, 159,
        !            35: 255, 173, 189, 156, 207, 190, 221, 245, 249, 184, 166, 174, 170, 240, 169, 238,
        !            36: 248, 241, 253, 252, 239, 230, 244, 250, 247, 251, 167, 175, 172, 171, 243, 168,
        !            37: 183, 181, 182, 199, 142, 143, 146, 128, 212, 144, 210, 211, 222, 214, 215, 216,
        !            38: 209, 165, 227, 224, 226, 229, 153, 158, 157, 235, 233, 234, 154, 237, 232, 225,
        !            39: 133, 160, 131, 198, 132, 134, 145, 135, 138, 130, 136, 137, 141, 161, 140, 139,
        !            40: 208, 164, 149, 162, 147, 228, 148, 246, 155, 151, 163, 150, 129, 236, 231, 152
        !            41: };
        !            42: 
        !            43: static unsigned char
        !            44: cp8502intern[] = {  /* IBM Code Page 850 to Latin-1 */
        !            45: 199, 252, 233, 226, 228, 224, 229, 231, 234, 235, 232, 239, 238, 236, 196, 197,
        !            46: 201, 230, 198, 244, 246, 242, 251, 249, 255, 214, 220, 248, 163, 216, 215, 159,
        !            47: 225, 237, 243, 250, 241, 209, 170, 186, 191, 174, 172, 189, 188, 161, 171, 187,
        !            48: 155, 156, 157, 144, 151, 193, 194, 192, 169, 135, 128, 131, 133, 162, 165, 147,
        !            49: 148, 153, 152, 150, 145, 154, 227, 195, 132, 130, 137, 136, 134, 129, 138, 164,
        !            50: 240, 208, 202, 203, 200, 158, 205, 206, 207, 149, 146, 141, 140, 166, 204, 139,
        !            51: 211, 223, 212, 210, 245, 213, 181, 254, 222, 218, 219, 217, 253, 221, 175, 180,
        !            52: 173, 177, 143, 190, 182, 167, 247, 184, 176, 168, 183, 185, 179, 178, 142, 160
        !            53: };
        !            54: 
        !            55: /* Russian language specific conversation section */
        !            56: /* Two point-to-point charset decode tables */
        !            57: 
        !            58: /* Decode single char from KOI8 to ALT-CODES, if present */
        !            59: static unsigned char intern2alt[] = {
        !            60:        0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7,
        !            61:        0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf,
        !            62:        0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7,
        !            63:        0xc8, 0xc9, 0xca, 0xff, 0xcc, 0xcd, 0xce, 0xcf,
        !            64:        0xd0, 0xd1, 0xd2, 0xf1, 0xd4, 0xd5, 0xd6, 0xd7,
        !            65:        0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf,
        !            66:        0xd3, 0xf3, 0xf2, 0xf0, 0xf4, 0xf5, 0xf6, 0xf7,
        !            67:        0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xcb,
        !            68:        0xee, 0xa0, 0xa1, 0xe6, 0xa4, 0xa5, 0xe4, 0xa3,
        !            69:        0xe5, 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae,
        !            70:        0xaf, 0xef, 0xe0, 0xe1, 0xe2, 0xe3, 0xa6, 0xa2,
        !            71:        0xec, 0xeb, 0xa7, 0xe8, 0xed, 0xe9, 0xe7, 0xea,
        !            72:        0x9e, 0x80, 0x81, 0x96, 0x84, 0x85, 0x94, 0x83,
        !            73:        0x95, 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e,
        !            74:        0x8f, 0x9f, 0x90, 0x91, 0x92, 0x93, 0x86, 0x82,
        !            75:        0x9c, 0x9b, 0x87, 0x98, 0x9d, 0x99, 0x97, 0x9a
        !            76: };
        !            77: 
        !            78: /* Decode single char from ALT-CODES, if present, to KOI8 */
        !            79: static unsigned char alt2intern[] = {
        !            80:        0xe1, 0xe2, 0xf7, 0xe7, 0xe4, 0xe5, 0xf6, 0xfa,
        !            81:        0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, 0xf0,
        !            82:        0xf2, 0xf3, 0xf4, 0xf5, 0xe6, 0xe8, 0xe3, 0xfe,
        !            83:        0xfb, 0xfd, 0xff, 0xf9, 0xf8, 0xfc, 0xe0, 0xf1,
        !            84:        0xc1, 0xc2, 0xd7, 0xc7, 0xc4, 0xc5, 0xd6, 0xda,
        !            85:        0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, 0xd0,
        !            86:        0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
        !            87:        0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f,
        !            88:        0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97,
        !            89:        0x98, 0x99, 0x9a, 0xbf, 0x9c, 0x9d, 0x9e, 0x9f,
        !            90:        0xa0, 0xa1, 0xa2, 0xb0, 0xa4, 0xa5, 0xa6, 0xa7,
        !            91:        0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf,
        !            92:        0xd2, 0xd3, 0xd4, 0xd5, 0xc6, 0xc8, 0xc3, 0xde,
        !            93:        0xdb, 0xdd, 0xdf, 0xd9, 0xd8, 0xdc, 0xc0, 0xd1,
        !            94:        0xb3, 0xa3, 0xb2, 0xb1, 0xb4, 0xb5, 0xb6, 0xb7,
        !            95:        0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0x9b
        !            96: };
        !            97: 
        !            98: /* End of Russian section */
        !            99: 
        !           100: /*
        !           101:  * Most Unixes has KOI8, and DOS has ALT_CODE
        !           102:  * If your Unix is non-standard, set CHARSET to "alt_codes"
        !           103:  * in config.txt
        !           104:  */
        !           105: 
        !           106: #ifndef        DEFAULT_CSET
        !           107: #define        DEFAULT_CSET    "noconv"
        !           108: #endif
        !           109: #ifndef        DEFAULT_RU_CSET
        !           110: #define        DEFAULT_RU_CSET "noconv"
        !           111: #endif
        !           112: 
        !           113: 
        !           114: int CONVERSION = NO_CONV;      /* None text file conversion at start time */
        !           115: 
        !           116: unsigned char *ext_c_ptr;
        !           117: unsigned char *int_c_ptr;
        !           118: 
        !           119: char charset[64] = "";
        !           120: 
        !           121: void
        !           122: init_charset()
        !           123: {
        !           124:        ext_c_ptr = NULL;       /* NULL means latin1 or KOI8 (internal format) */
        !           125:        int_c_ptr = NULL;
        !           126: 
        !           127:        if (charset[0] == '\0')
        !           128:        {       /* use default character set for this system */
        !           129:                if (strcmp(language, "ru") == 0)
        !           130:                        strcpy(charset, DEFAULT_RU_CSET);
        !           131:                else
        !           132:                        strcpy(charset, DEFAULT_CSET);
        !           133:        }
        !           134:        else
        !           135:                strlwr(charset);
        !           136: 
        !           137:        /* latin-1 and KOI8 are in internal format: no conversion needed */
        !           138:        if (!strcmp(charset, "latin1") || !strcmp(charset, "koi8") ||
        !           139:                !strcmp(charset, "noconv"))
        !           140:                return;
        !           141: 
        !           142:        if (!strcmp(charset, "alt_codes"))
        !           143:        {       ext_c_ptr = intern2alt;
        !           144:                int_c_ptr = alt2intern;
        !           145:        } else if (!strcmp(charset, "cp850"))
        !           146:        {       ext_c_ptr = intern2cp850;
        !           147:                int_c_ptr = cp8502intern;
        !           148:        } else if (!strcmp(charset, "ascii"))
        !           149:        {       ext_c_ptr = intern2ascii;
        !           150:        } else
        !           151:        {
        !           152:                fprintf(stderr, PSTR("Unsupported character set: '%s'\n"), charset);
        !           153:        }
        !           154: }
        !           155: 
        !           156: char
        !           157: EXT_C(char c)
        !           158: {
        !           159:        if (c > '\0' || !ext_c_ptr)
        !           160:                return c;
        !           161:        return ext_c_ptr[c & 0x7f];
        !           162: }
        !           163: 
        !           164: char
        !           165: INT_C(char c)
        !           166: {
        !           167:        if (c > '\0' || !int_c_ptr)
        !           168:                return c;
        !           169:        return int_c_ptr[c & 0x7f];
        !           170: }

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