michael@0: /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0: /* vim:set ts=2 sw=2 sts=2 et cindent: */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: 
michael@0:   /**
michael@0:    * computes the aggregate string length
michael@0:    */
michael@0: 
michael@0: nsTSubstringTuple_CharT::size_type
michael@0: nsTSubstringTuple_CharT::Length() const
michael@0:   {
michael@0:     uint32_t len;
michael@0:     if (mHead)
michael@0:       len = mHead->Length();
michael@0:     else
michael@0:       len = TO_SUBSTRING(mFragA).Length();
michael@0: 
michael@0:     return len + TO_SUBSTRING(mFragB).Length();
michael@0:   }
michael@0: 
michael@0: 
michael@0:   /**
michael@0:    * writes the aggregate string to the given buffer.  bufLen is assumed
michael@0:    * to be equal to or greater than the value returned by the Length()
michael@0:    * method.  the string written to |buf| is not null-terminated.
michael@0:    */
michael@0: 
michael@0: void
michael@0: nsTSubstringTuple_CharT::WriteTo( char_type *buf, uint32_t bufLen ) const
michael@0:   {
michael@0:     const substring_type& b = TO_SUBSTRING(mFragB);
michael@0: 
michael@0:     NS_ASSERTION(bufLen >= b.Length(), "buffer too small");
michael@0:     uint32_t headLen = bufLen - b.Length();
michael@0:     if (mHead)
michael@0:       {
michael@0:         mHead->WriteTo(buf, headLen);
michael@0:       }
michael@0:     else
michael@0:       {
michael@0:         const substring_type& a = TO_SUBSTRING(mFragA);
michael@0: 
michael@0:         NS_ASSERTION(a.Length() == headLen, "buffer incorrectly sized");
michael@0:         char_traits::copy(buf, a.Data(), a.Length());
michael@0:       }
michael@0: 
michael@0:     char_traits::copy(buf + headLen, b.Data(), b.Length());
michael@0: 
michael@0: #if 0
michael@0:     // we need to write out data into |buf|, ending at |buf+bufLen|.  so our
michael@0:     // data needs to precede |buf+bufLen| exactly.  we trust that the buffer
michael@0:     // was properly sized!
michael@0: 
michael@0:     const substring_type& b = TO_SUBSTRING(mFragB);
michael@0: 
michael@0:     NS_ASSERTION(bufLen >= b.Length(), "buffer is too small");
michael@0:     char_traits::copy(buf + bufLen - b.Length(), b.Data(), b.Length());
michael@0: 
michael@0:     bufLen -= b.Length();
michael@0: 
michael@0:     if (mHead)
michael@0:       {
michael@0:         mHead->WriteTo(buf, bufLen);
michael@0:       }
michael@0:     else
michael@0:       {
michael@0:         const substring_type& a = TO_SUBSTRING(mFragA);
michael@0:         NS_ASSERTION(bufLen == a.Length(), "buffer is too small");
michael@0:         char_traits::copy(buf, a.Data(), a.Length());
michael@0:       }
michael@0: #endif
michael@0:   }
michael@0: 
michael@0: 
michael@0:   /**
michael@0:    * returns true if this tuple is dependent on (i.e., overlapping with)
michael@0:    * the given char sequence.
michael@0:    */
michael@0: 
michael@0: bool
michael@0: nsTSubstringTuple_CharT::IsDependentOn( const char_type *start, const char_type *end ) const
michael@0:   {
michael@0:     // we start with the right-most fragment since it is faster to check.
michael@0: 
michael@0:     if (TO_SUBSTRING(mFragB).IsDependentOn(start, end))
michael@0:       return true;
michael@0: 
michael@0:     if (mHead)
michael@0:       return mHead->IsDependentOn(start, end);
michael@0: 
michael@0:     return TO_SUBSTRING(mFragA).IsDependentOn(start, end);
michael@0:   }