/*

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 *

 */

/*

 *

 * (C) Copyright IBM Corp. 1998-2013 - All Rights Reserved

 *

 */

#include "LETypes.h"

#include "MorphTables.h"

#include "StateTables.h"

#include "MorphStateTables.h"

#include "SubtableProcessor.h"

#include "StateTableProcessor.h"

#include "LigatureSubstProc.h"

#include "LEGlyphStorage.h"

#include "LESwaps.h"

U_NAMESPACE_BEGIN

#define ExtendedComplement(m) ((le_int32) (~((le_uint32) (m))))

#define SignBit(m) ((ExtendedComplement(m) >> 1) & (le_int32)(m))

#define SignExtend(v,m) (((v) & SignBit(m))? ((v) | ExtendedComplement(m)): (v))

UOBJECT_DEFINE_RTTI_IMPLEMENTATION(LigatureSubstitutionProcessor)

{

    ligatureActionTableOffset = SWAPW(ligatureSubstitutionHeader->ligatureActionTableOffset);

    componentTableOffset = SWAPW(ligatureSubstitutionHeader->componentTableOffset);

    ligatureTableOffset = SWAPW(ligatureSubstitutionHeader->ligatureTableOffset);

}

LigatureSubstitutionProcessor::~LigatureSubstitutionProcessor()

{

}

void LigatureSubstitutionProcessor::beginStateTable()

{

    m = -1;

}

ByteOffset LigatureSubstitutionProcessor::processStateEntry(LEGlyphStorage &glyphStorage, le_int32 &currGlyph, EntryTableIndex index)

{

    ByteOffset newState = SWAPW(entry->newStateOffset);

    le_int16 flags = SWAPW(entry->flags);

    if (flags & lsfSetComponent) {

        if (++m >= nComponents) {

            m = 0;

        }

        componentStack[m] = currGlyph;

    } else if ( m == -1) {

        // bad font- skip this glyph.

        currGlyph++;

        return newState;

    }

    ByteOffset actionOffset = flags & lsfActionOffsetMask;

    if (actionOffset != 0) {

        LigatureActionEntry action;

        le_int32 offset, i = 0;

        le_int32 stack[nComponents];

        le_int16 mm = -1;

        do {

            le_uint32 componentGlyph = componentStack[m--];

            if (m < 0) {

                m = nComponents - 1;

            }

            offset = action & lafComponentOffsetMask;

            if (offset != 0) {

                  currGlyph++;

                  LE_DEBUG_BAD_FONT("off end of ligature substitution header");

                  return newState; // get out! bad font

                if (action & (lafLast | lafStore))  {

                } else {

                }

            }

#if LE_ASSERT_BAD_FONT

            if(m<0) {

              LE_DEBUG_BAD_FONT("m<0")

            }

#endif

        } while (!(action & lafLast)  && (m>=0) ); // stop if last bit is set, or if run out of items

        while (mm >= 0) {

        }

    }

    if (!(flags & lsfDontAdvance)) {

        // should handle reverse too!

        currGlyph += 1;

    }

    return newState;

}

void LigatureSubstitutionProcessor::endStateTable()

{

}

U_NAMESPACE_END