// Decodes a BER BIT STRING from the given buffer and stores
// the value in this object.
void AsnBits::BDecContent (const AsnBuf &b, AsnTag tagId, AsnLen elmtLen, AsnLen &bytesDecoded)
{
FUNC("AsnBits::BDecContent");
if (elmtLen == INDEFINITE_LEN || elmtLen > b.length())
{
throw MemoryException(elmtLen, "elmtLen requests for too much data", STACK_ENTRY);
}
/*
* tagId is encoded tag shifted into long int.
* if CONS bit is set then constructed bit string
*/
if (tagId & 0x20000000)
BDecConsBits (b, elmtLen, bytesDecoded);
else /* primitive octet string */
{
if (elmtLen == INDEFINITE_LEN)
throw BoundsException("indefinite length on primitive", STACK_ENTRY);
if (elmtLen > b.length() || elmtLen <= 0)
throw BoundsException("length problem on decoding content", STACK_ENTRY);
bytesDecoded += elmtLen;
elmtLen--;
unsigned int iUnusedBitLen= (unsigned int)b.GetByte();
if (iUnusedBitLen > 7)
throw BoundsException("Length problem - Unused bits > 7", STACK_ENTRY);
bitLen = (elmtLen * 8) - iUnusedBitLen;
bits = new unsigned char[elmtLen];
b.GetUSeg (bits, elmtLen);
}
} /* AsnBits::BDecContent */
