asn1_read_value_type (3) - Linux Man Pages
asn1_read_value_type: API function
NAMEasn1_read_value_type - API function
- asn1_node 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 (may be NULL).
- int * len
- number of bytes of *value: value..value[len-1]. Initialy holds the sizeof value.
- unsigned int * etype
- The type of the value read (ASN1_ETYPE)
DESCRIPTIONReturns the type and value of one element inside a structure. If an element is OPTIONAL and this 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. If the root provided is a node to specific sequence element, then the keyword "?CURRENT" is also acceptable and indicates the current sequence element of this node.
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 IDENTIFIER: VALUE will be a null terminated string with each number separated by a dot (i.e. "18.104.22.1683.1").
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.
GENERALSTRINGVALUE will contain the generalstring and LEN will be the number of octets.
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.
RETURNSASN1_SUCCESS if value is returned, ASN1_ELEMENT_NOT_FOUND if name is not a valid element, ASN1_VALUE_NOT_FOUND if there isn't any value for the element selected, and ASN1_MEM_ERROR if The value vector isn't big enough to store the result, and in this case len will contain the number of bytes needed.
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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. As an alternative you may obtain the manual from: