/// <summary>
/// Read sequnce. (only check the value type)
/// </summary>
/// <returns>true if succeeded.</returns>
public bool ReadSequence() {
BERTagInfo tagInfo = new BERTagInfo();
if (ReadTagInfo(ref tagInfo)
&& tagInfo.IsConstructed == true
&& tagInfo.TagNumber == TAG_SEQUENCE
&& (tagInfo.Length == LENGTH_INDEFINITE || tagInfo.Length > 0)) {
return true;
}
return false;
}
/// <summary>
/// Read sequnce. (only check the value type)
/// </summary>
/// <returns>true if succeeded.</returns>
public bool ReadSequence()
{
BERTagInfo tagInfo = new BERTagInfo();
if (ReadTagInfo(ref tagInfo) &&
tagInfo.IsConstructed == true &&
tagInfo.TagNumber == TAG_SEQUENCE &&
(tagInfo.Length == LENGTH_INDEFINITE || tagInfo.Length > 0))
{
return(true);
}
return(false);
}
/// <summary>
/// Read tag. (only check the value type)
/// </summary>
/// <param name="tagClass">expected tag class</param>
/// <param name="isConstructed">expected value of "constructed" flag</param>
/// <param name="tagNumber">expected tag number</param>
/// <param name="length">length of the value field will be stored</param>
/// <returns>true if succeeded.</returns>
public bool ReadTag(TagClass tagClass, bool isConstructed, int tagNumber, out int length)
{
BERTagInfo tagInfo = new BERTagInfo();
if (ReadTagInfo(ref tagInfo) &&
tagInfo.ClassBits == (int)tagClass &&
tagInfo.IsConstructed == isConstructed &&
tagInfo.TagNumber == tagNumber)
{
length = tagInfo.Length;
return(true);
}
length = 0;
return(false);
}
/// <summary>
/// Read integer.
/// </summary>
/// <param name="bigint">BigInteger instance will be stored if succeeded.</param>
/// <returns>true if succeeded.</returns>
public bool ReadInteger(out BigInteger bigint) {
BERTagInfo tagInfo = new BERTagInfo();
if (ReadTagInfo(ref tagInfo)
&& tagInfo.IsConstructed == false
&& tagInfo.TagNumber == TAG_INTEGER
&& tagInfo.Length != LENGTH_INDEFINITE
&& tagInfo.Length > 0) {
byte[] buff = new byte[tagInfo.Length];
int len = strm.Read(buff, 0, tagInfo.Length);
if (len == tagInfo.Length) {
bigint = new BigInteger(buff);
return true;
}
}
bigint = null;
return false;
}
/// <summary>
/// Read integer.
/// </summary>
/// <param name="bigint">BigInteger instance will be stored if succeeded.</param>
/// <returns>true if succeeded.</returns>
public bool ReadInteger(out BigInteger bigint)
{
BERTagInfo tagInfo = new BERTagInfo();
if (ReadTagInfo(ref tagInfo) &&
tagInfo.IsConstructed == false &&
tagInfo.TagNumber == TAG_INTEGER &&
tagInfo.Length != LENGTH_INDEFINITE &&
tagInfo.Length > 0)
{
byte[] buff = new byte[tagInfo.Length];
int len = strm.Read(buff, 0, tagInfo.Length);
if (len == tagInfo.Length)
{
bigint = new BigInteger(buff);
return(true);
}
}
bigint = null;
return(false);
}
internal bool ReadTagInfo(ref BERTagInfo tagInfo)
{
return(ReadTag(ref tagInfo.ClassBits, ref tagInfo.IsConstructed, ref tagInfo.TagNumber) && ReadLength(ref tagInfo.Length));
}
internal bool ReadTagInfo(ref BERTagInfo tagInfo)
{
return ReadTag(ref tagInfo.ClassBits, ref tagInfo.IsConstructed, ref tagInfo.TagNumber) && ReadLength(ref tagInfo.Length);
}
/// <summary>
/// Read tag. (only check the value type)
/// </summary>
/// <param name="tagClass">expected tag class</param>
/// <param name="isConstructed">expected value of "constructed" flag</param>
/// <param name="tagNumber">expected tag number</param>
/// <param name="length">length of the value field will be stored</param>
/// <returns>true if succeeded.</returns>
public bool ReadTag(TagClass tagClass, bool isConstructed, int tagNumber, out int length)
{
BERTagInfo tagInfo = new BERTagInfo();
if (ReadTagInfo(ref tagInfo)
&& tagInfo.ClassBits == (int)tagClass
&& tagInfo.IsConstructed == isConstructed
&& tagInfo.TagNumber == tagNumber) {
length = tagInfo.Length;
return true;
}
length = 0;
return false;
}
