FreeCalypso > hg > fc-pcsc-tools
view libcommon/alpha_valid.c @ 65:cc48ac3b151c
doc/User-oriented-commands: basic info commands documented
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sun, 14 Feb 2021 23:03:00 +0000 |
parents | f7145c77b7fb |
children |
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/* * This module contains functions for validating alpha fields * that exist in various SIM files. */ #include <sys/types.h> #include <string.h> #include <strings.h> #include <stdio.h> #include <stdlib.h> static validate_classic_gsm(data, nbytes, textlenp) u_char *data; unsigned nbytes, *textlenp; { u_char *dp; unsigned n; dp = data; for (n = 0; n < nbytes; n++) { if (*dp == 0xFF) break; if (*dp & 0x80) return(-1); dp++; } if (textlenp) *textlenp = n; for (; n < nbytes; n++) if (*dp++ != 0xFF) return(-1); return(0); } static validate_ucs2_80(data, nbytes, textlenp) u_char *data; unsigned nbytes, *textlenp; { u_char *dp, *endp; if (nbytes < 3) return(-1); dp = data + 1; endp = data + nbytes; while (dp < endp) { if (dp + 1 == endp) { if (*dp != 0xFF) return(-1); if (textlenp) *textlenp = dp - data; return(0); } if (dp[0] == 0xFF && dp[1] == 0xFF) break; dp += 2; } if (textlenp) *textlenp = dp - data; while (dp < endp) if (*dp++ != 0xFF) return(-1); return(0); } static validate_ucs2_81(data, nbytes, textlenp) u_char *data; unsigned nbytes, *textlenp; { u_char *dp, *endp; unsigned textlen; if (nbytes < 4) return(-1); if (!data[1]) return(-1); textlen = data[1] + 3; if (textlen > nbytes) return(-1); if (textlenp) *textlenp = textlen; dp = data + textlen; endp = data + nbytes; while (dp < endp) if (*dp++ != 0xFF) return(-1); return(0); } static validate_ucs2_82(data, nbytes, textlenp) u_char *data; unsigned nbytes, *textlenp; { u_char *dp, *endp; unsigned textlen; if (nbytes < 5) return(-1); if (!data[1]) return(-1); textlen = data[1] + 4; if (textlen > nbytes) return(-1); if (textlenp) *textlenp = textlen; dp = data + textlen; endp = data + nbytes; while (dp < endp) if (*dp++ != 0xFF) return(-1); return(0); } static validate_empty(data, nbytes, textlenp) u_char *data; unsigned nbytes, *textlenp; { u_char *dp; unsigned n; dp = data; for (n = 0; n < nbytes; n++) if (*dp++ != 0xFF) return(-1); if (textlenp) *textlenp = 0; return(0); } validate_alpha_field(data, nbytes, textlenp) u_char *data; unsigned nbytes, *textlenp; { if (data[0] < 0x80) return validate_classic_gsm(data, nbytes, textlenp); switch (data[0]) { case 0x80: return validate_ucs2_80(data, nbytes, textlenp); case 0x81: return validate_ucs2_81(data, nbytes, textlenp); case 0x82: return validate_ucs2_82(data, nbytes, textlenp); case 0xFF: return validate_empty(data, nbytes, textlenp); default: return -1; } }