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view uptools/libcoding/gsm7_decode.c @ 920:0306449ba467
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author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sat, 31 Dec 2022 21:08:05 +0000 |
parents | 30fbaa652ea5 |
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/* * This library module implements the decoding of GSM7-encoded data * into ASCII, ISO 8859-1 or UTF-8. */ #include <sys/types.h> #include <stdio.h> extern u_short gsm7_decode_table[128]; extern u_short gsm7ext_decode_table[128]; gsm7_to_ascii_or_ext(inbuf, inlen, outbuf, outlenp, ascii_ext, newline_ok) u_char *inbuf, *outbuf; unsigned inlen, *outlenp; { u_char *inp, *endp, *outp; unsigned gsm, uni; int is_ext; inp = inbuf; endp = inbuf + inlen; outp = outbuf; while (inp < endp) { gsm = *inp++; if (gsm == 0x1B && inp < endp && *inp != 0x1B && *inp != '\n' && *inp != '\r') { gsm = *inp++; uni = gsm7ext_decode_table[gsm]; if (uni == '\\') { *outp++ = '\\'; *outp++ = '\\'; continue; } if (uni == 0x20AC && ascii_ext < 2) { *outp++ = '\\'; *outp++ = 'E'; continue; } is_ext = 1; } else { switch (gsm) { case 0x1B: *outp++ = '\\'; *outp++ = 'e'; continue; case '\n': if (newline_ok) *outp++ = '\n'; else { *outp++ = '\\'; *outp++ = 'n'; } continue; case '\r': *outp++ = '\\'; *outp++ = 'r'; continue; } uni = gsm7_decode_table[gsm]; is_ext = 0; } if (!uni || !is_decoded_char_ok(uni, ascii_ext)) { if (is_ext) { *outp++ = '\\'; *outp++ = 'e'; } sprintf(outp, "\\%02X", gsm); outp += 3; } else if (ascii_ext == 2) outp += emit_utf8_char(uni, outp); else *outp++ = uni; } *outp = '\0'; if (outlenp) *outlenp = outp - outbuf; }