149 lines
4.5 KiB
C++
149 lines
4.5 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: NPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.1 (the "License"); you may not use this file except in
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* compliance with the License. You may obtain a copy of the License at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1999
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the NPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the NPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef _MDB_
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#include "mdb.h"
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#endif
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#ifndef _MORK_
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#include "mork.h"
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#endif
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#ifndef _ORKINCOMPARE_
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#include "orkinCompare.h"
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#endif
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#ifndef _MORKENV_
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#include "morkEnv.h"
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#endif
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//3456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789
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orkinCompare::orkinCompare() // does nothing
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{
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}
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/*virtual*/
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orkinCompare::~orkinCompare() // does nothing
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{
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}
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mdb_order // standard yarn comparison for nsIMdbCompare::Order()
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mdbYarn_Order(const mdbYarn* inSelf, morkEnv* ev, const mdbYarn* inYarn)
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{
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// This code is a close copy of public domain Mithril's AgYarn_CompareLen().
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// Note all comments are from the original public domain Mithril code.
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mork_u1* self = (mork_u1*) inSelf->mYarn_Buf;
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mork_u1* yarn = (mork_u1*) inYarn->mYarn_Buf;
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mdb_fill selfFill = inSelf->mYarn_Fill;
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mdb_fill yarnFill = inYarn->mYarn_Fill;
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if ( selfFill && yarnFill ) /* neither yarn is empty? */
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{
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register int a; /* a byte from self */
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register int b; /* a byte from yarn */
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/* predecrement is normally used in loop tests to minimize instructions: */
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++selfFill; /* prepare for predecrement */
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++yarnFill; /* prepare for predecrement */
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/* we check only self len at loop top, but yarn len check must follow: */
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while ( --selfFill ) /* another byte in self? */
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{
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if ( !--yarnFill ) /* yarn runs out first? self is greater (pos)? */
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return 1;
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b = (mork_u1) *yarn++; /* next byte in other yarn */
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a = (mork_u1) *self++; /* next byte in self yarn */
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if ( a != b ) /* found first different byte? */
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return ( a - b ); /* return relative order */
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}
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/* if remaining yarn len is exactly 1, it runs out at same time as self: */
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return ( yarnFill == 1 )? 0 : -1; /* yarn is same len? or self is less? */
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}
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else
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return ((mdb_order) selfFill) - ((mdb_order) yarnFill);
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}
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// { ===== begin nsIMdbCompare methods =====
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/*virtual*/ mdb_err
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orkinCompare::Order(nsIMdbEnv* mev, // compare first to second yarn
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const mdbYarn* inFirst, // first yarn in comparison
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const mdbYarn* inSecond, // second yarn in comparison
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mdb_order* outOrder) // negative="<", zero="=", positive=">"
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{
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mdb_err outErr = 1; // nonzero means FAILURE
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morkEnv* ev = morkEnv::FromMdbEnv(mev);
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if ( ev )
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{
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if ( inFirst && inSecond && outOrder )
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{
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*outOrder = mdbYarn_Order(inFirst, ev, inSecond);
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}
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else
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ev->NilPointerError();
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outErr = ev->AsErr();
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}
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return outErr;
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}
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/*virtual*/ mdb_err
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orkinCompare::AddStrongRef(nsIMdbEnv* ev) // does nothing
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{
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MORK_USED_1(ev);
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return 0;
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}
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/*virtual*/ mdb_err
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orkinCompare::CutStrongRef(nsIMdbEnv* ev) // does nothing
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{
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MORK_USED_1(ev);
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return 0;
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}
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// } ===== end nsIMdbCompare methods =====
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//3456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789
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