asn1_read_value_type man page on Archlinux

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asn1_read_value_type(3)		   libtasn1	       asn1_read_value_type(3)

       asn1_read_value_type - API function

       #include <libtasn1.h>

       int  asn1_read_value_type(asn1_node  root,  const  char	* name, void *
       ivalue, int * len, unsigned int * etype);

       asn1_node root
		   pointer to a structure.

       const char * name
		   the name of the element inside a structure that you want to

       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[0]..value[len-1]. Initialy
		   holds the sizeof value.

       unsigned int * etype
		   The type of the value read (ASN1_ETYPE)

       Returns 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.

       VALUE will contain a two's complement form integer.

       integer=-1  -> value[0]=0xFF , len=1.  integer=1	  ->  value[0]=0x01  ,

       As INTEGER (but only with not negative numbers).

       VALUE will be the null terminated string "TRUE" or "FALSE" and LEN=5 or

       OBJECT IDENTIFIER: VALUE will be a null	terminated  string  with  each
       number separated by a dot (i.e. "").

       LEN = strlen(VALUE)+1

       VALUE will be a null terminated string in one of these formats: "YYMMD‐
       Dhhmmss+hh'mm'" or "YYMMDDhhmmss-hh'mm'".  LEN=strlen(VALUE)+1.

       VALUE will be a null terminated string in the same format used  to  set
       the value.

       OCTET  STRING:  VALUE will contain the octet string and LEN will be the
       number of octets.

       VALUE will contain the generalstring and LEN  will  be  the  number  of

       BIT  STRING:  VALUE  will contain the bit string organized by bytes and
       LEN will be the number of bits.

       If NAME indicates a choice type, VALUE  will  specify  the  alternative

       If  NAME indicates an any type, VALUE will indicate the DER encoding of
       the structure actually used.

       ASN1_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 num‐
       ber of bytes needed.

       Copyright © 2006-2013 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.

       The 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:

libtasn1			      3.4	       asn1_read_value_type(3)

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