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      1 /*
      2  *
      3  * (C) Copyright IBM Corp. 1998-2013 - All Rights Reserved
      4  *
      5  */
      6 
      7 #include "LETypes.h"
      8 #include "MorphTables.h"
      9 #include "StateTables.h"
     10 #include "MorphStateTables.h"
     11 #include "SubtableProcessor.h"
     12 #include "StateTableProcessor.h"
     13 #include "LEGlyphStorage.h"
     14 #include "LESwaps.h"
     15 
     16 U_NAMESPACE_BEGIN
     17 
     18 StateTableProcessor::StateTableProcessor()
     19 {
     20 }
     21 
     22 StateTableProcessor::StateTableProcessor(const LEReferenceTo<MorphSubtableHeader> &morphSubtableHeader, LEErrorCode &success)
     23   : SubtableProcessor(morphSubtableHeader, success), stateTableHeader(morphSubtableHeader, success),
     24     stHeader(stateTableHeader, success, (const StateTableHeader*)&stateTableHeader->stHeader)
     25 {
     26   if(LE_FAILURE(success)) return;
     27     stateSize = SWAPW(stateTableHeader->stHeader.stateSize);
     28     classTableOffset = SWAPW(stateTableHeader->stHeader.classTableOffset);
     29     stateArrayOffset = SWAPW(stateTableHeader->stHeader.stateArrayOffset);
     30     entryTableOffset = SWAPW(stateTableHeader->stHeader.entryTableOffset);
     31 
     32     classTable = LEReferenceTo<ClassTable>(stateTableHeader, success, ((char *) &stateTableHeader->stHeader + classTableOffset));
     33   if(LE_FAILURE(success)) return;
     34     firstGlyph = SWAPW(classTable->firstGlyph);
     35     lastGlyph  = firstGlyph + SWAPW(classTable->nGlyphs);
     36 }
     37 
     38 StateTableProcessor::~StateTableProcessor()
     39 {
     40 }
     41 
     42 void StateTableProcessor::process(LEGlyphStorage &glyphStorage, LEErrorCode &success)
     43 {
     44     if (LE_FAILURE(success)) return;
     45     LE_STATE_PATIENCE_INIT();
     46 
     47     // Start at state 0
     48     // XXX: How do we know when to start at state 1?
     49     ByteOffset currentState = stateArrayOffset;
     50 
     51     // XXX: reverse?
     52     le_int32 currGlyph = 0;
     53     le_int32 glyphCount = glyphStorage.getGlyphCount();
     54 
     55     beginStateTable();
     56 
     57     while (currGlyph <= glyphCount) {
     58         if(LE_STATE_PATIENCE_DECR()) break; // patience exceeded.
     59         ClassCode classCode = classCodeOOB;
     60         if (currGlyph == glyphCount) {
     61             // XXX: How do we handle EOT vs. EOL?
     62             classCode = classCodeEOT;
     63         } else {
     64             TTGlyphID glyphCode = (TTGlyphID) LE_GET_GLYPH(glyphStorage[currGlyph]);
     65 
     66             if (glyphCode == 0xFFFF) {
     67                 classCode = classCodeDEL;
     68             } else if ((glyphCode >= firstGlyph) && (glyphCode < lastGlyph)) {
     69                 classCode = classTable->classArray[glyphCode - firstGlyph];
     70             }
     71         }
     72 
     73         LEReferenceToArrayOf<EntryTableIndex> stateArray(stHeader, success, currentState, LE_UNBOUNDED_ARRAY);
     74         EntryTableIndex entryTableIndex = stateArray.getObject((le_uint8)classCode, success);
     75         LE_STATE_PATIENCE_CURR(le_int32, currGlyph);
     76         currentState = processStateEntry(glyphStorage, currGlyph, entryTableIndex);
     77         LE_STATE_PATIENCE_INCR(currGlyph);
     78     }
     79 
     80     endStateTable();
     81 }
     82 
     83 U_NAMESPACE_END
     84