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asn1_read_value_type(3)		   libtasn1	       asn1_read_value_type(3)

NAME
       asn1_read_value_type - API function

SYNOPSIS
       #include	<libtasn1.h>

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

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

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

DESCRIPTION
       Returns	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 spe-
       cific sequence element, then the	keyword	"?CURRENT" is also  acceptable
       and indicates the current sequence element of this node.

       Note  that  there  can  be valid	values with length zero. In these case
       this function will succeed and  len will	be zero.

INTEGER
       VALUE will contain a two's complement form integer.

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

ENUMERATED
       As INTEGER (but only with not negative numbers).

BOOLEAN
       VALUE 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. "1.2.3.543.1").

       LEN = strlen(VALUE)+1

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

GENERALIZEDTIME
       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.

GENERALSTRING
       VALUE will contain the generalstring and	LEN  will  be  the  number  of
       octets.

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

CHOICE
       If NAME indicates a choice type,	VALUE will specify the alternative se-
       lected.

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

RETURNS
       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
       Copyright (C) 2006-2015 Free Software Foundation, Inc..
       Copying and distribution	of this	file, with  or	without	 modification,
       are  permitted in any medium without royalty provided the copyright no-
       tice and	this notice are	preserved.

SEE ALSO
       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:

	      http://www.gnu.org/software/libtasn1/manual/

libtasn1			      4.8	       asn1_read_value_type(3)

NAME | SYNOPSIS | ARGUMENTS | DESCRIPTION | INTEGER | ENUMERATED | BOOLEAN | UTCTIME | GENERALIZEDTIME | GENERALSTRING | CHOICE | ANY | RETURNS | COPYRIGHT | SEE ALSO

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