{
SilcUInt32 enclen = 0, i, charval = 0;
- if (!bin || !bin_len)
+ if (!bin || !bin_len) {
+ silc_set_errno(SILC_ERR_INVALID_ARGUMENT);
return 0;
+ }
if (bin_encoding == SILC_STRING_UTF8) {
if (!silc_utf8_valid(bin, bin_len))
if (!utf8)
return bin_len;
if (bin_len > utf8_size)
- return 0;
+ goto overflow;
memcpy(utf8, bin, bin_len);
return bin_len;
}
for (i = 0; i < bin_len; i++) {
if (bin[i] == '\\') {
if (i + 1 >= bin_len)
- return 0;
+ goto overflow;
/* If escaped character is any of the following no processing is
needed, otherwise it is a hex value and we need to read it. */
cv != '>' && cv != ';' && cv != ' ' && cv != '#') {
unsigned int hexval;
if (i + 2 >= bin_len)
+ goto overflow;
+ if (sscanf(&bin[i + 1], "%02X", &hexval) != 1) {
+ silc_set_errno_posix(errno);
return 0;
- if (sscanf(&bin[i + 1], "%02X", &hexval) != 1)
- return 0;
+ }
if (utf8) {
if (enclen + 1 > utf8_size)
- return 0;
+ goto overflow;
utf8[enclen] = (unsigned char)hexval;
}
if (utf8) {
if (enclen + 1 > utf8_size)
- return 0;
+ goto overflow;
utf8[enclen] = bin[i];
}
enclen++;
break;
case SILC_STRING_ASCII_ESC:
SILC_NOT_IMPLEMENTED("SILC_STRING_ASCII_ESC");
+ silc_set_errno(SILC_ERR_NOT_SUPPORTED);
return 0;
break;
case SILC_STRING_BMP:
if (i + 1 >= bin_len)
- return 0;
+ goto overflow;
SILC_GET16_MSB(charval, bin + i);
i += 1;
break;
case SILC_STRING_BMP_LSB:
if (i + 1 >= bin_len)
- return 0;
+ goto overflow;
SILC_GET16_LSB(charval, bin + i);
i += 1;
break;
case SILC_STRING_UNIVERSAL:
if (i + 3 >= bin_len)
- return 0;
+ goto overflow;
SILC_GET32_MSB(charval, bin + i);
i += 3;
break;
case SILC_STRING_UNIVERSAL_LSB:
if (i + 3 >= bin_len)
- return 0;
+ goto overflow;
SILC_GET32_LSB(charval, bin + i);
i += 3;
break;
case SILC_STRING_PRINTABLE:
case SILC_STRING_VISIBLE:
- if (!isprint(bin[i]))
+ if (!isprint(bin[i])) {
+ silc_set_errno(SILC_ERR_PROHIBITED_CHAR);
return 0;
+ }
charval = bin[i];
break;
case SILC_STRING_NUMERICAL:
- if (bin[i] != 0x20 && !isdigit(bin[i]))
+ if (bin[i] != 0x20 && !isdigit(bin[i])) {
+ silc_set_errno(SILC_ERR_PROHIBITED_CHAR);
return 0;
+ }
charval = bin[i];
break;
default:
+ silc_set_errno(SILC_ERR_INVALID_ARGUMENT);
return 0;
break;
}
if (charval < 0x80) {
if (utf8) {
if (enclen > utf8_size)
- return 0;
+ goto overflow;
utf8[enclen] = (unsigned char)charval;
}
} else if (charval < 0x800) {
if (utf8) {
if (enclen + 2 > utf8_size)
- return 0;
+ goto overflow;
utf8[enclen ] = (unsigned char )(((charval >> 6) & 0x1f) | 0xc0);
utf8[enclen + 1] = (unsigned char )((charval & 0x3f) | 0x80);
} else if (charval < 0x10000) {
if (utf8) {
if (enclen + 3 > utf8_size)
- return 0;
+ goto overflow;
utf8[enclen ] = (unsigned char )(((charval >> 12) & 0xf) | 0xe0);
utf8[enclen + 1] = (unsigned char )(((charval >> 6) & 0x3f) | 0x80);
} else if (charval < 0x200000) {
if (utf8) {
if (enclen + 4 > utf8_size)
- return 0;
+ goto overflow;
utf8[enclen ] = (unsigned char )(((charval >> 18) & 0x7) | 0xf0);
utf8[enclen + 1] = (unsigned char )(((charval >> 12) & 0x3f) | 0x80);
} else if (charval < 0x4000000) {
if (utf8) {
if (enclen + 5 > utf8_size)
- return 0;
+ goto overflow;
utf8[enclen ] = (unsigned char )(((charval >> 24) & 0x3) | 0xf8);
utf8[enclen + 1] = (unsigned char )(((charval >> 18) & 0x3f) | 0x80);
} else {
if (utf8) {
if (enclen + 6 > utf8_size)
- return 0;
+ goto overflow;
utf8[enclen ] = (unsigned char )(((charval >> 30) & 0x1) | 0xfc);
utf8[enclen + 1] = (unsigned char )(((charval >> 24) & 0x3f) | 0x80);
}
return enclen;
+
+ overflow:
+ silc_set_errno(SILC_ERR_OVERFLOW);
+ return 0;
}
/* Decodes UTF-8 encoded string `utf8' to string of which encoding is
{
SilcUInt32 enclen = 0, i, charval, bytes;
- if (!utf8 || !utf8_len)
+ if (!utf8 || !utf8_len) {
+ silc_set_errno(SILC_ERR_INVALID_ARGUMENT);
return 0;
+ }
if (bin_encoding == SILC_STRING_UTF8) {
- if (!silc_utf8_valid(utf8, utf8_len) ||
- utf8_len > bin_size)
+ if (!silc_utf8_valid(utf8, utf8_len))
return 0;
+ if (utf8_len > bin_size)
+ goto overflow;
memcpy(bin, utf8, utf8_len);
return utf8_len;
}
bytes = 1;
} else if ((utf8[i] & 0xe0) == 0xc0) {
if (i + 1 >= utf8_len)
- return 0;
+ goto overflow;
if ((utf8[i + 1] & 0xc0) != 0x80)
- return 0;
+ goto bad_char;
charval = (utf8[i++] & 0x1f) << 6;
charval |= utf8[i] & 0x3f;
bytes = 2;
} else if ((utf8[i] & 0xf0) == 0xe0) {
if (i + 2 >= utf8_len)
- return 0;
+ goto overflow;
if (((utf8[i + 1] & 0xc0) != 0x80) ||
((utf8[i + 2] & 0xc0) != 0x80))
- return 0;
+ goto bad_char;
/* Surrogates not allowed (D800-DFFF) */
if (utf8[i] == 0xed &&
utf8[i + 1] >= 0xa0 && utf8[i + 1] <= 0xbf &&
utf8[i + 2] >= 0x80 && utf8[i + 2] <= 0xbf)
- return 0;
+ goto bad_char;
charval = (utf8[i++] & 0xf) << 12;
charval |= (utf8[i++] & 0x3f) << 6;
charval |= utf8[i] & 0x3f;
if (charval < 0x800)
- return 0;
+ goto bad_char;
bytes = 3;
} else if ((utf8[i] & 0xf8) == 0xf0) {
if (i + 3 >= utf8_len)
- return 0;
+ goto overflow;
if (((utf8[i + 1] & 0xc0) != 0x80) ||
((utf8[i + 2] & 0xc0) != 0x80) ||
((utf8[i + 3] & 0xc0) != 0x80))
- return 0;
+ goto bad_char;
charval = ((SilcUInt32)(utf8[i++] & 0x7)) << 18;
charval |= (utf8[i++] & 0x3f) << 12;
charval |= (utf8[i++] & 0x3f) << 6;
charval |= utf8[i] & 0x3f;
if (charval < 0x10000)
- return 0;
+ goto bad_char;
bytes = 4;
} else if ((utf8[i] & 0xfc) == 0xf8) {
if (i + 4 >= utf8_len)
- return 0;
+ goto overflow;
if (((utf8[i + 1] & 0xc0) != 0x80) ||
((utf8[i + 2] & 0xc0) != 0x80) ||
((utf8[i + 3] & 0xc0) != 0x80) ||
((utf8[i + 4] & 0xc0) != 0x80))
- return 0;
+ goto bad_char;
charval = ((SilcUInt32)(utf8[i++] & 0x3)) << 24;
charval |= ((SilcUInt32)(utf8[i++] & 0x3f)) << 18;
charval |= (utf8[i++] & 0x3f) << 6;
charval |= utf8[i] & 0x3f;
if (charval < 0x200000)
- return 0;
+ goto bad_char;
bytes = 5;
} else if ((utf8[i] & 0xfe) == 0xfc) {
if (i + 5 >= utf8_len)
- return 0;
+ goto overflow;
if (((utf8[i + 1] & 0xc0) != 0x80) ||
((utf8[i + 2] & 0xc0) != 0x80) ||
((utf8[i + 3] & 0xc0) != 0x80) ||
((utf8[i + 4] & 0xc0) != 0x80) ||
((utf8[i + 5] & 0xc0) != 0x80))
- return 0;
+ goto bad_char;
charval = ((SilcUInt32)(utf8[i++] & 0x1)) << 30;
charval |= ((SilcUInt32)(utf8[i++] & 0x3f)) << 24;
charval |= (utf8[i++] & 0x3f) << 6;
charval |= utf8[i] & 0x3f;
if (charval < 0x4000000)
- return 0;
+ goto bad_char;
bytes = 6;
} else {
- return 0;
+ goto bad_char;
}
switch (bin_encoding) {
case SILC_STRING_NUMERICAL:
if (bin) {
if (enclen + 1 > bin_size)
- return 0;
+ goto overflow;
bin[enclen] = (unsigned char)charval;
}
case SILC_STRING_BMP:
if (bin) {
if (enclen + 2 > bin_size)
- return 0;
+ goto overflow;
SILC_PUT16_MSB(charval, bin + enclen);
}
enclen += 2;
case SILC_STRING_BMP_LSB:
if (bin) {
if (enclen + 2 > bin_size)
- return 0;
+ goto overflow;
SILC_PUT16_LSB(charval, bin + enclen);
}
enclen += 2;
case SILC_STRING_UNIVERSAL:
if (bin) {
if (enclen + 4 > bin_size)
- return 0;
+ goto overflow;
SILC_PUT32_MSB(charval, bin + enclen);
}
enclen += 4;
case SILC_STRING_UNIVERSAL_LSB:
if (bin) {
if (enclen + 4 > bin_size)
- return 0;
+ goto overflow;
SILC_PUT32_LSB(charval, bin + enclen);
}
enclen += 4;
if (!enclen && (cv == '#' || cv == ' ')) {
if (bin) {
if (enclen + 2 > bin_size)
- return 0;
+ goto overflow;
bin[enclen] = '\\';
bin[enclen + 1] = cv;
}
if (i == utf8_len - 1 && cv == ' ') {
if (bin) {
if (enclen + 2 > bin_size)
- return 0;
+ goto overflow;
bin[enclen] = '\\';
bin[enclen + 1] = cv;
}
cv == '>' || cv == ';') {
if (bin) {
if (enclen + 2 > bin_size)
- return 0;
+ goto overflow;
bin[enclen] = '\\';
bin[enclen + 1] = cv;
}
if (!isprint((int)cv)) {
if (bin) {
if (enclen + 3 > bin_size)
- return 0;
+ goto overflow;
bin[enclen] = '\\';
silc_snprintf(bin + enclen + 1, 3, "%02X", cv);
}
if (bin) {
if (enclen + 1 > bin_size)
- return 0;
+ goto overflow;
bin[enclen] = cv;
}
enclen++;
}
break;
default:
+ silc_set_errno(SILC_ERR_INVALID_ARGUMENT);
return 0;
break;
}
}
return enclen;
+
+ overflow:
+ silc_set_errno(SILC_ERR_OVERFLOW);
+ return 0;
+
+ bad_char:
+ silc_set_errno(SILC_ERR_BAD_CHAR_ENCODING);
+ return 0;
}
/* UTF-8 to wide characters */
if (!tmp_len)
return 0;
- if (utf8_wide_size < tmp_len / 2)
+ if (utf8_wide_size < tmp_len / 2) {
+ silc_set_errno(SILC_ERR_OVERFLOW);
return 0;
+ }
memset(utf8_wide, 0, utf8_wide_size * 2);
SilcUInt32 tmp_len;
int i, k;
- if (utf8_size < wide_str_len * 2)
+ if (utf8_size < wide_str_len * 2) {
+ silc_set_errno(SILC_ERR_OVERFLOW);
return 0;
+ }
memset(utf8, 0, utf8_size);