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asn1_read_value(3)			     libtasn1			       asn1_read_value(3)

NAME
       asn1_read_value - API function

SYNOPSIS
       #include <libtasn1.h>

       int asn1_read_value(asn1_node root, const char * name, void * ivalue, int * len);

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.

       int * len   number of bytes of *value: value[0]..value[len-1]. Initialy holds  the  sizeof
		   value.

DESCRIPTION
       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.

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:	"YYMMDDhhmmss+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 selected.

ANY
       If NAME indicates an any type, VALUE will indicate the DER encoding of the structure actu-
       ally 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  con-
       tain the number of bytes needed.

COPYRIGHT
       Copyright (C) 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.

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.

libtasn1				       3.3			       asn1_read_value(3)
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