Manual Section... (3) - page: asn1_read_value
NAMEasn1_read_value - Returns the value of one element inside a structure
- ASN1_TYPE root
- pointer to a structure.
- const char * name
- the name of the element inside a structure that you want to read.
- void * ivalue
- vector that will contain the element's content, must be a pointer to memory cells already allocated.
- int * len
- number of bytes of *value: value..value[len-1]. Initialy holds the sizeof value.
DESCRIPTIONReturns the value of one element inside a structure.
If an element is OPTIONAL and the function "read_value" returns ASN1_ELEMENT_NOT_FOUND, it means that this element wasn't present in the der encoding that created the structure. The first element of a SEQUENCE_OF or SET_OF is named "?1". The second one "?2" and so on.
INTEGERVALUE will contain a two's complement form integer.
ENUMERATEDAs INTEGER (but only with not negative numbers).
BOOLEANVALUE will be the null terminated string "TRUE" or "FALSE" and LEN=5 or LEN=6.
OBJECT IDENTIFIERVALUE will be a null terminated string with each number separated by a dot (i.e. "22.214.171.1243.1").
UTCTIMEVALUE will be a null terminated string in one of these formats: "YYMMDDhhmmss+hh'mm'" or "YYMMDDhhmmss-hh'mm'". LEN=strlen(VALUE)+1.
GENERALIZEDTIMEVALUE will be a null terminated string in the same format used to set the value.
OCTET STRINGVALUE will contain the octet string and LEN will be the number of octets.
GENERALSTRINGVALUE will contain the generalstring and LEN will be the number of octets.
BIT STRINGVALUE will contain the bit string organized by bytes and LEN will be the number of bits.
CHOICEIf NAME indicates a choice type, VALUE will specify the alternative selected.
ANYIf NAME indicates an any type, VALUE will indicate the DER encoding of the structure actually used.
ASN1_SUCCESSSet value OK.
ASN1_ELEMENT_NOT_FOUNDNAME is not a valid element.
ASN1_VALUE_NOT_FOUNDThere isn't any value for the element selected.
ASN1_MEM_ERRORThe value vector isn't big enough to store the result. In this case LEN will contain the number of bytes needed.
COPYRIGHTCopyright © 2006, 2007, 2008, 2009 Free Software Foundation, Inc..
Copying and distribution of this file, with or without modification, are permitted in any medium without royalty provided the copyright notice and this notice are preserved.
SEE ALSOThe full documentation for libtasn1 is maintained as a Texinfo manual. If the info and libtasn1 programs are properly installed at your site, the command
- info libtasn1
should give you access to the complete manual.
- OBJECT IDENTIFIER
- OCTET STRING
- BIT STRING
- SEE ALSO
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Time: 15:27:39 GMT, June 11, 2010