1 /*
   2  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   3  *
   4  * This code is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License version 2 only, as
   6  * published by the Free Software Foundation.  Oracle designates this
   7  * particular file as subject to the "Classpath" exception as provided
   8  * by Oracle in the LICENSE file that accompanied this code.
   9  *
  10  * This code is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  13  * version 2 for more details (a copy is included in the LICENSE file that
  14  * accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License version
  17  * 2 along with this work; if not, write to the Free Software Foundation,
  18  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  19  *
  20  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  21  * or visit www.oracle.com if you need additional information or have any
  22  * questions.
  23  *
  24  */
  25 
  26 /*
  27  *
  28  * (C) Copyright IBM Corp. 1998-2004 - All Rights Reserved
  29  *
  30  */
  31 
  32 #include "LETypes.h"
  33 #include "MorphTables.h"
  34 #include "StateTables.h"
  35 #include "MorphStateTables.h"
  36 #include "SubtableProcessor.h"
  37 #include "StateTableProcessor.h"
  38 #include "LEGlyphStorage.h"
  39 #include "LESwaps.h"
  40 
  41 U_NAMESPACE_BEGIN
  42 
  43 StateTableProcessor::StateTableProcessor()
  44 {
  45 }
  46 
  47 StateTableProcessor::StateTableProcessor(const LEReferenceTo<MorphSubtableHeader> &morphSubtableHeader, LEErrorCode &success)
  48   : SubtableProcessor(morphSubtableHeader, success), stateTableHeader(morphSubtableHeader, success),
  49     stHeader(stateTableHeader, success, (const StateTableHeader*)&stateTableHeader->stHeader)
  50 {
  51   if(LE_FAILURE(success)) return;
  52     stateSize = SWAPW(stateTableHeader->stHeader.stateSize);
  53     classTableOffset = SWAPW(stateTableHeader->stHeader.classTableOffset);
  54     stateArrayOffset = SWAPW(stateTableHeader->stHeader.stateArrayOffset);
  55     entryTableOffset = SWAPW(stateTableHeader->stHeader.entryTableOffset);
  56 
  57     classTable = LEReferenceTo<ClassTable>(stateTableHeader, success, ((char *) &stateTableHeader->stHeader + classTableOffset));
  58   if(LE_FAILURE(success)) return;
  59     firstGlyph = SWAPW(classTable->firstGlyph);
  60     lastGlyph  = firstGlyph + SWAPW(classTable->nGlyphs);
  61 }
  62 
  63 StateTableProcessor::~StateTableProcessor()
  64 {
  65 }
  66 
  67 void StateTableProcessor::process(LEGlyphStorage &glyphStorage, LEErrorCode &success)
  68 {
  69     if (LE_FAILURE(success)) return;
  70     LE_STATE_PATIENCE_INIT();
  71 
  72     // Start at state 0
  73     // XXX: How do we know when to start at state 1?
  74     ByteOffset currentState = stateArrayOffset;
  75 
  76     // XXX: reverse?
  77     le_int32 currGlyph = 0;
  78     le_int32 glyphCount = glyphStorage.getGlyphCount();
  79 
  80     beginStateTable();
  81 
  82     while (currGlyph <= glyphCount) {
  83         if(LE_STATE_PATIENCE_DECR()) break; // patience exceeded.
  84         if (LE_FAILURE(success)) break;
  85         ClassCode classCode = classCodeOOB;
  86         if (currGlyph == glyphCount) {
  87             // XXX: How do we handle EOT vs. EOL?
  88             classCode = classCodeEOT;
  89             break;
  90         } else {
  91             TTGlyphID glyphCode = (TTGlyphID) LE_GET_GLYPH(glyphStorage[currGlyph]);
  92 
  93             if (glyphCode == 0xFFFF) {
  94                 classCode = classCodeDEL;
  95             } else if ((glyphCode >= firstGlyph) && (glyphCode < lastGlyph)) {
  96                 classCode = classTable->classArray[glyphCode - firstGlyph];
  97             }
  98         }
  99 
 100         LEReferenceToArrayOf<EntryTableIndex> stateArray(stHeader, success, currentState, LE_UNBOUNDED_ARRAY);
 101         EntryTableIndex entryTableIndex = stateArray.getObject((le_uint8)classCode, success);
 102         if (LE_FAILURE(success)) { break; }
 103         LE_STATE_PATIENCE_CURR(le_int32, currGlyph);
 104         currentState = processStateEntry(glyphStorage, currGlyph, entryTableIndex, success);
 105         LE_STATE_PATIENCE_INCR(currGlyph);
 106     }
 107 
 108     endStateTable();
 109 }
 110 
 111 U_NAMESPACE_END