114 lines
3.7 KiB
C
114 lines
3.7 KiB
C
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/************************************************************************/
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/* SISCO SOFTWARE MODULE HEADER *****************************************/
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/************************************************************************/
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/* (c) Copyright Systems Integration Specialists Company, Inc., */
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/* 1986 - 2001, All Rights Reserved. */
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/* */
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/* PROPRIETARY AND CONFIDENTIAL */
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/* */
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/* MODULE NAME : ard_objid.c */
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/* PRODUCT(S) : ASN1DE */
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/* */
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/* MODULE DESCRIPTION : */
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/* */
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/* GLOBAL FUNCTIONS DEFINED IN THIS MODULE : */
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/* */
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/* MODIFICATION LOG : */
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/* Date Who Rev Comments */
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/* -------- --- ------ ------------------------------------------- */
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/* 12/20/01 JRB 03 Chg ASN1_CTXT to ASN1_DEC_CTXT. */
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/* 09/13/99 MDE 02 Added SD_CONST modifiers */
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/* 07/26/99 MDE 01 New module, derived from ard_objid.c */
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/************************************************************************/
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#include "glbtypes.h"
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#include "sysincs.h"
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#include "asn1r.h"
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#include "asn1log.h"
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/************************************************************************/
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/* For debug version, use a static pointer to avoid duplication of */
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/* __FILE__ strings. */
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#ifdef DEBUG_SISCO
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SD_CONST static ST_CHAR *SD_CONST thisFileName = __FILE__;
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#endif
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/************************************************************************/
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/************************************************************************/
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/* get_objid */
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/* Function to read an object identifier data element from an ASN.1 msg */
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/* and put sub-identifiers into integer array. */
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/************************************************************************/
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#define MAX_OBJ_ID_COMPONENTS 16
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ST_RET asn1r_get_objid (ASN1_DEC_CTXT *ac, ST_INT16 component_list[], ST_INT *num_components)
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{
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ST_UCHAR c; /* Temporary storage for octets. */
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ST_UCHAR *last_pos; /* One past last position of this data element. */
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ST_UINT16 j; /* Temporarily holds value encoded in 2 octets. */
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ST_INT i; /* Counter for looping through sub-identifiers. */
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#ifdef DEBUG_ASN1_DECODE
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if (!num_components || !component_list)
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{
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slogCallStack (sLogCtrl,
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"get_objid: attempt to reference through a NULL pointer");
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return(SD_FAILURE);
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}
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#endif
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last_pos = ac->asn1r_field_ptr + ac->asn1r_elmnt_len;
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c = *(ac->asn1r_field_ptr++); /* First 2 subIDs reside in 1st octet. */
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if (c & 0x80)
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{
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ALOG_NERR0 ("ASN.1 decode: Object ID first octet error");
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return (SD_FAILURE);
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}
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if ((component_list[0] = c/40) > 2)
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{
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ALOG_NERR0 ("ASN.1 decode: Object ID component 0 too big");
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return (SD_FAILURE);
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}
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if ((component_list[1] = c%40) > 39)
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{
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ALOG_NERR0 ("ASN.1 decode: Object ID component 1 too big");
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return (SD_FAILURE);
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}
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*num_components = 2;
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/* Decode remaining subIDs in contents of object identifier data el't. */
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for (i=2; ac->asn1r_field_ptr < last_pos; i++,(*num_components)++)
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{
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if (i >= MAX_OBJ_ID_COMPONENTS) /* avoid overwrite */
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{
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ALOG_NERR0 ("ASN.1 decode: Object ID too many components");
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return (SD_FAILURE);
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}
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if ((c = *(ac->asn1r_field_ptr++)) & 0x80) /* if next octet is not last - */
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{
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if (*ac->asn1r_field_ptr & 0x80) /* reject if more than 2 octets */
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{
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ALOG_NERR0 ("ASN.1 decode: Object ID more than 2 octets for value");
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return (SD_FAILURE);
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}
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j = (ST_UINT16) (c & 0x7F) << 7; /* support two octets per subID */
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j |= (*(ac->asn1r_field_ptr++) & 0x7F); /* merge the 14 ID bits */
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component_list[i] = j;
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}
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else /* only one octet */
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component_list[i] = (ST_UINT16) c; /* write masked ID code */
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}
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return(SD_SUCCESS);
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}
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