obj_dat.c

mediastreamer2是开源的网络传输媒体流的库

			return(NULL);
			}
		return(nid_objs[n].ln);
		}
	else if (added == NULL)
		return(NULL);
	else
		{
		ad.type=ADDED_NID;
		ad.obj= &ob;
		ob.nid=n;
		adp=(ADDED_OBJ *)lh_retrieve(added,&ad);
		if (adp != NULL)
			return(adp->obj->ln);
		else
			{
			OBJerr(OBJ_F_OBJ_NID2LN,OBJ_R_UNKNOWN_NID);
			return(NULL);
			}
		}
	}

int OBJ_obj2nid(const ASN1_OBJECT *a)
	{
	ASN1_OBJECT **op;
	ADDED_OBJ ad,*adp;

	if (a == NULL)
		return(NID_undef);
	if (a->nid != 0)
		return(a->nid);

	if (added != NULL)
		{
		ad.type=ADDED_DATA;
		ad.obj=(ASN1_OBJECT *)a; /* XXX: ugly but harmless */
		adp=(ADDED_OBJ *)lh_retrieve(added,&ad);
		if (adp != NULL) return (adp->obj->nid);
		}
	op=(ASN1_OBJECT **)OBJ_bsearch((const char *)&a,(const char *)obj_objs,
		NUM_OBJ, sizeof(ASN1_OBJECT *),obj_cmp);
	if (op == NULL)
		return(NID_undef);
	return((*op)->nid);
	}

/* Convert an object name into an ASN1_OBJECT
 * if "noname" is not set then search for short and long names first.
 * This will convert the "dotted" form into an object: unlike OBJ_txt2nid
 * it can be used with any objects, not just registered ones.
 */

ASN1_OBJECT *OBJ_txt2obj(const char *s, int no_name)
	{
	int nid = NID_undef;
	ASN1_OBJECT *op=NULL;
	unsigned char *buf;
	unsigned char *p;
	const unsigned char *cp;
	int i, j;

	if(!no_name) {
		if( ((nid = OBJ_sn2nid(s)) != NID_undef) ||
			((nid = OBJ_ln2nid(s)) != NID_undef) ) 
					return OBJ_nid2obj(nid);
	}

	/* Work out size of content octets */
	i=a2d_ASN1_OBJECT(NULL,0,s,-1);
	if (i <= 0) {
		/* Clear the error */
		ERR_clear_error();
		return NULL;
	}
	/* Work out total size */
	j = ASN1_object_size(0,i,V_ASN1_OBJECT);

	if((buf=(unsigned char *)OPENSSL_malloc(j)) == NULL) return NULL;

	p = buf;
	/* Write out tag+length */
	ASN1_put_object(&p,0,i,V_ASN1_OBJECT,V_ASN1_UNIVERSAL);
	/* Write out contents */
	a2d_ASN1_OBJECT(p,i,s,-1);

	cp=buf;
	op=d2i_ASN1_OBJECT(NULL,&cp,j);
	OPENSSL_free(buf);
	return op;
	}

int OBJ_obj2txt(char *buf, int buf_len, const ASN1_OBJECT *a, int no_name)
{
	int i,idx=0,n=0,len,nid;
	unsigned long l;
	unsigned char *p;
	const char *s;
	char tbuf[DECIMAL_SIZE(i)+DECIMAL_SIZE(l)+2];

	if (buf_len <= 0) return(0);

	if ((a == NULL) || (a->data == NULL)) {
		buf[0]='\0';
		return(0);
	}

	if (no_name || (nid=OBJ_obj2nid(a)) == NID_undef) {
		len=a->length;
		p=a->data;

		idx=0;
		l=0;
		while (idx < a->length) {
			l|=(p[idx]&0x7f);
			if (!(p[idx] & 0x80)) break;
			l<<=7L;
			idx++;
		}
		idx++;
		i=(int)(l/40);
		if (i > 2) i=2;
		l-=(long)(i*40);

		BIO_snprintf(tbuf,sizeof tbuf,"%d.%lu",i,l);
		i=strlen(tbuf);
		BUF_strlcpy(buf,tbuf,buf_len);
		buf_len-=i;
		buf+=i;
		n+=i;

		l=0;
		for (; idx<len; idx++) {
			l|=p[idx]&0x7f;
			if (!(p[idx] & 0x80)) {
				BIO_snprintf(tbuf,sizeof tbuf,".%lu",l);
				i=strlen(tbuf);
				if (buf_len > 0)
					BUF_strlcpy(buf,tbuf,buf_len);
				buf_len-=i;
				buf+=i;
				n+=i;
				l=0;
			}
			l<<=7L;
		}
	} else {
		s=OBJ_nid2ln(nid);
		if (s == NULL)
			s=OBJ_nid2sn(nid);
		BUF_strlcpy(buf,s,buf_len);
		n=strlen(s);
	}
	return(n);
}

int OBJ_txt2nid(const char *s)
{
	ASN1_OBJECT *obj;
	int nid;
	obj = OBJ_txt2obj(s, 0);
	nid = OBJ_obj2nid(obj);
	ASN1_OBJECT_free(obj);
	return nid;
}

int OBJ_ln2nid(const char *s)
	{
	ASN1_OBJECT o,*oo= &o,**op;
	ADDED_OBJ ad,*adp;

	o.ln=s;
	if (added != NULL)
		{
		ad.type=ADDED_LNAME;
		ad.obj= &o;
		adp=(ADDED_OBJ *)lh_retrieve(added,&ad);
		if (adp != NULL) return (adp->obj->nid);
		}
	op=(ASN1_OBJECT **)OBJ_bsearch((char *)&oo,(char *)ln_objs, NUM_LN,
		sizeof(ASN1_OBJECT *),ln_cmp);
	if (op == NULL) return(NID_undef);
	return((*op)->nid);
	}

int OBJ_sn2nid(const char *s)
	{
	ASN1_OBJECT o,*oo= &o,**op;
	ADDED_OBJ ad,*adp;

	o.sn=s;
	if (added != NULL)
		{
		ad.type=ADDED_SNAME;
		ad.obj= &o;
		adp=(ADDED_OBJ *)lh_retrieve(added,&ad);
		if (adp != NULL) return (adp->obj->nid);
		}
	op=(ASN1_OBJECT **)OBJ_bsearch((char *)&oo,(char *)sn_objs,NUM_SN,
		sizeof(ASN1_OBJECT *),sn_cmp);
	if (op == NULL) return(NID_undef);
	return((*op)->nid);
	}

static int obj_cmp(const void *ap, const void *bp)
	{
	int j;
	const ASN1_OBJECT *a= *(ASN1_OBJECT * const *)ap;
	const ASN1_OBJECT *b= *(ASN1_OBJECT * const *)bp;

	j=(a->length - b->length);
        if (j) return(j);
	return(memcmp(a->data,b->data,a->length));
        }

const char *OBJ_bsearch(const char *key, const char *base, int num, int size,
	int (*cmp)(const void *, const void *))
	{
	return OBJ_bsearch_ex(key, base, num, size, cmp, 0);
	}

const char *OBJ_bsearch_ex(const char *key, const char *base, int num,
	int size, int (*cmp)(const void *, const void *), int flags)
	{
	int l,h,i=0,c=0;
	const char *p = NULL;

	if (num == 0) return(NULL);
	l=0;
	h=num;
	while (l < h)
		{
		i=(l+h)/2;
		p= &(base[i*size]);
		c=(*cmp)(key,p);
		if (c < 0)
			h=i;
		else if (c > 0)
			l=i+1;
		else
			break;
		}
#ifdef CHARSET_EBCDIC
/* THIS IS A KLUDGE - Because the *_obj is sorted in ASCII order, and
 * I don't have perl (yet), we revert to a *LINEAR* search
 * when the object wasn't found in the binary search.
 */
	if (c != 0)
		{
		for (i=0; i<num; ++i)
			{
			p= &(base[i*size]);
			c = (*cmp)(key,p);
			if (c == 0 || (c < 0 && (flags & OBJ_BSEARCH_VALUE_ON_NOMATCH)))
				return p;
			}
		}
#endif
	if (c != 0 && !(flags & OBJ_BSEARCH_VALUE_ON_NOMATCH))
		p = NULL;
	else if (c == 0 && (flags & OBJ_BSEARCH_FIRST_VALUE_ON_MATCH))
		{
		while(i > 0 && (*cmp)(key,&(base[(i-1)*size])) == 0)
			i--;
		p = &(base[i*size]);
		}
	return(p);
	}

int OBJ_create_objects(BIO *in)
	{
	MS_STATIC char buf[512];
	int i,num=0;
	char *o,*s,*l=NULL;

	for (;;)
		{
		s=o=NULL;
		i=BIO_gets(in,buf,512);
		if (i <= 0) return(num);
		buf[i-1]='\0';
		if (!isalnum((unsigned char)buf[0])) return(num);
		o=s=buf;
		while (isdigit((unsigned char)*s) || (*s == '.'))
			s++;
		if (*s != '\0')
			{
			*(s++)='\0';
			while (isspace((unsigned char)*s))
				s++;
			if (*s == '\0')
				s=NULL;
			else
				{
				l=s;
				while ((*l != '\0') && !isspace((unsigned char)*l))
					l++;
				if (*l != '\0')
					{
					*(l++)='\0';
					while (isspace((unsigned char)*l))
						l++;
					if (*l == '\0') l=NULL;
					}
				else
					l=NULL;
				}
			}
		else
			s=NULL;
		if ((o == NULL) || (*o == '\0')) return(num);
		if (!OBJ_create(o,s,l)) return(num);
		num++;
		}
	/* return(num); */
	}

int OBJ_create(const char *oid, const char *sn, const char *ln)
	{
	int ok=0;
	ASN1_OBJECT *op=NULL;
	unsigned char *buf;
	int i;

	i=a2d_ASN1_OBJECT(NULL,0,oid,-1);
	if (i <= 0) return(0);

	if ((buf=(unsigned char *)OPENSSL_malloc(i)) == NULL)
		{
		OBJerr(OBJ_F_OBJ_CREATE,ERR_R_MALLOC_FAILURE);
		return(0);
		}
	i=a2d_ASN1_OBJECT(buf,i,oid,-1);
	if (i == 0)
		goto err;
	op=(ASN1_OBJECT *)ASN1_OBJECT_create(OBJ_new_nid(1),buf,i,sn,ln);
	if (op == NULL) 
		goto err;
	ok=OBJ_add_object(op);
err:
	ASN1_OBJECT_free(op);
	OPENSSL_free(buf);
	return(ok);
	}