94 lines
2.5 KiB
C++
94 lines
2.5 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/**
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* computes the aggregate string length
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*/
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nsTSubstringTuple_CharT::size_type
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nsTSubstringTuple_CharT::Length() const
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{
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uint32_t len;
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if (mHead) {
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len = mHead->Length();
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} else {
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len = TO_SUBSTRING(mFragA).Length();
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}
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return len + TO_SUBSTRING(mFragB).Length();
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}
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/**
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* writes the aggregate string to the given buffer. aBufLen is assumed
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* to be equal to or greater than the value returned by the Length()
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* method. the string written to |aBuf| is not null-terminated.
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*/
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void
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nsTSubstringTuple_CharT::WriteTo(char_type* aBuf, uint32_t aBufLen) const
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{
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const substring_type& b = TO_SUBSTRING(mFragB);
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NS_ASSERTION(aBufLen >= b.Length(), "buffer too small");
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uint32_t headLen = aBufLen - b.Length();
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if (mHead) {
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mHead->WriteTo(aBuf, headLen);
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} else {
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const substring_type& a = TO_SUBSTRING(mFragA);
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NS_ASSERTION(a.Length() == headLen, "buffer incorrectly sized");
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char_traits::copy(aBuf, a.Data(), a.Length());
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}
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char_traits::copy(aBuf + headLen, b.Data(), b.Length());
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#if 0
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// we need to write out data into |aBuf|, ending at |aBuf + aBufLen|. So our
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// data needs to precede |aBuf + aBufLen| exactly. We trust that the buffer
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// was properly sized!
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const substring_type& b = TO_SUBSTRING(mFragB);
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NS_ASSERTION(aBufLen >= b.Length(), "buffer is too small");
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char_traits::copy(aBuf + aBufLen - b.Length(), b.Data(), b.Length());
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aBufLen -= b.Length();
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if (mHead) {
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mHead->WriteTo(aBuf, aBufLen);
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} else {
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const substring_type& a = TO_SUBSTRING(mFragA);
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NS_ASSERTION(aBufLen == a.Length(), "buffer is too small");
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char_traits::copy(aBuf, a.Data(), a.Length());
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}
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#endif
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}
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/**
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* returns true if this tuple is dependent on (i.e., overlapping with)
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* the given char sequence.
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*/
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bool
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nsTSubstringTuple_CharT::IsDependentOn(const char_type* aStart,
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const char_type* aEnd) const
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{
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// we aStart with the right-most fragment since it is faster to check.
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if (TO_SUBSTRING(mFragB).IsDependentOn(aStart, aEnd)) {
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return true;
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}
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if (mHead) {
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return mHead->IsDependentOn(aStart, aEnd);
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}
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return TO_SUBSTRING(mFragA).IsDependentOn(aStart, aEnd);
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}
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