Mercurial > dropbear
view libtomcrypt/src/pk/asn1/der/utf8/der_length_utf8_string.c @ 1088:f2a3570b5110
Test struct existance against sizeof() operator
Instead of declaring an "unused-variable" or "unused-but-set-variable"
structure.
This avoid unexpected broken configurations when using something like:
$ ./configure CFLAGS="-Wall -Wextra -Werror"
It causes AC_COMPILE_IFELSE to fail and thus leading to a mismatch
configuration (because the CFLAGS are passed to the macro).
author | Gaël PORTAY <gael.portay@gmail.com> |
---|---|
date | Sat, 02 May 2015 13:33:34 +0200 |
parents | 0cbe8f6dbf9e |
children | f849a5ca2efc |
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/* 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, [email protected], 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 $ */