/* LibTomCrypt, modular cryptographic library -- Tom St Denis * * LibTomCrypt is a library that provides various cryptographic * algorithms in a highly modular and flexible manner. * * The library is free for all purposes without any express * guarantee it works. * * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.com */#include "tomcrypt.h"/**  @file der_length_utf8_string.c  ASN.1 DER, get length of UTF8 STRING, Tom St Denis*/#ifdef LTC_DER/** Return the size in bytes of a UTF-8 character  @param c   The UTF-8 character to measure  @return    The size in bytes*/unsigned long der_utf8_charsize(const wchar_t c){   if (c <= 0x7F) {      return 1;   } else if (c <= 0x7FF) {      return 2;   } else if (c <= 0xFFFF) {      return 3;   } else {      return 4;   }}/**  Gets length of DER encoding of UTF8 STRING   @param in       The characters to measure the length of  @param noctets  The number of octets in the string to encode  @param outlen   [out] The length of the DER encoding for the given string  @return CRYPT_OK if successful*/int der_length_utf8_string(const wchar_t *in, unsigned long noctets, unsigned long *outlen){   unsigned long x, len;   LTC_ARGCHK(in     != NULL);   LTC_ARGCHK(outlen != NULL);   len = 0;   for (x = 0; x < noctets; x++) {      if (in[x] < 0 || in[x] > 0x10FFFF) {         return CRYPT_INVALID_ARG;      }      len += der_utf8_charsize(in[x]);   }   if (len < 128) {      /* 0C LL DD DD DD ... */      *outlen = 2 + len;   } else if (len < 256) {      /* 0C 81 LL DD DD DD ... */      *outlen = 3 + len;   } else if (len < 65536UL) {      /* 0C 82 LL LL DD DD DD ... */      *outlen = 4 + len;   } else if (len < 16777216UL) {      /* 0C 83 LL LL LL DD DD DD ... */      *outlen = 5 + len;   } else {      return CRYPT_INVALID_ARG;   }   return CRYPT_OK;}#endif/* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/utf8/der_length_utf8_string.c,v $ *//* $Revision: 1.5 $ *//* $Date: 2006/12/16 17:41:21 $ */