asn1_read_value man page on Mandriva

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asn1_read_value(3)		   libtasn1		    asn1_read_value(3)

NAME
       asn1_read_value - API function

SYNOPSIS
       #include <libtasn1.h>

       asn1_retCode  asn1_read_value(ASN1_TYPE root, const char * name, void *
       ivalue, int * len);

ARGUMENTS
       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[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: "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
       selected.

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

RETURNS
COPYRIGHT
       Copyright © 2006, 2007, 2008,  2009,  2010  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			      2.6		    asn1_read_value(3)
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