CanonicalEncodingRulesElement.realNumber

• ASN1ConstructionException if the element is marked as "constructed"
• ASN1TruncationException if the value appears to be "cut off"
• ConvException if character-encoding cannot be converted to the selected floating-point type, T
• ConvOverflowException if the character-encoding encodes a number that is too big for the selected floating-point type to express
• ASN1ValueSizeException if the binary-encoding contains fewer bytes than the information byte purports, or if the binary-encoded mantissa is too big to be expressed by an unsigned long integer
• ASN1ValueException if a complicated-form exponent or a non-zero-byte mantissa encodes a zero or even number, of if a base-10 (character-encoded) REAL is has something wrong that is not covered by ASN1ValueCharactersException or ASN1ValuePaddingException
• ASN1ValueUndefinedException if both bits indicating the base in the information byte of a binary-encoded $(MONO REAL)'s information byte are set, which would indicate an invalid base, or if a special value has been indicated that is not defined by the specification
• ASN1ValuePaddingException if a base-10 (character-encoded) REAL is encoded with leading zeroes, or trailing zeroes on the mantissa, or if the mantissa is encoded on more than the minimal necessary octets
• ASN1ValueCharactersException if a base-10 (character-encoded) REAL is encoded with characters that are not numeric, a decimal, E, or plus or minus

Citations:

• Dubuisson, Olivier. “Basic Encoding Rules (BER).” ASN.1: Communication between Heterogeneous Systems, Morgan Kaufmann, 2001, pp. 400-402.
• https://www.iso.org/standard/12285.html, ISO 6093