icuSources/layout/StateTableProcessor.cpp

   1 /*
   2  *
   3  * (C) Copyright IBM Corp. 1998-2004 - 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 MorphSubtableHeader *morphSubtableHeader)
  23   : SubtableProcessor(morphSubtableHeader)
  24 {
  25     stateTableHeader = (const MorphStateTableHeader *) morphSubtableHeader;
  26
  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 = (const ClassTable *) ((char *) &stateTableHeader->stHeader + classTableOffset);
  33     firstGlyph = SWAPW(classTable->firstGlyph);
  34     lastGlyph  = firstGlyph + SWAPW(classTable->nGlyphs);
  35 }
  36
  37 StateTableProcessor::~StateTableProcessor()
  38 {
  39 }
  40
  41 void StateTableProcessor::process(LEGlyphStorage &glyphStorage)
  42 {
  43     // Start at state 0
  44     // XXX: How do we know when to start at state 1?
  45     ByteOffset currentState = stateArrayOffset;
  46
  47     // XXX: reverse?
  48     le_int32 currGlyph = 0;
  49     le_int32 glyphCount = glyphStorage.getGlyphCount();
  50
  51     beginStateTable();
  52
  53     while (currGlyph <= glyphCount) {
  54         ClassCode classCode = classCodeOOB;
  55         if (currGlyph == glyphCount) {
  56             // XXX: How do we handle EOT vs. EOL?
  57             classCode = classCodeEOT;
  58         } else {
  59             TTGlyphID glyphCode = (TTGlyphID) LE_GET_GLYPH(glyphStorage[currGlyph]);
  60
  61             if (glyphCode == 0xFFFF) {
  62                 classCode = classCodeDEL;
  63             } else if ((glyphCode >= firstGlyph) && (glyphCode < lastGlyph)) {
  64                 classCode = classTable->classArray[glyphCode - firstGlyph];
  65             }
  66         }
  67
  68         const EntryTableIndex *stateArray = (const EntryTableIndex *) ((char *) &stateTableHeader->stHeader + currentState);
  69         EntryTableIndex entryTableIndex = stateArray[(le_uint8)classCode];
  70
  71         currentState = processStateEntry(glyphStorage, currGlyph, entryTableIndex);
  72     }
  73
  74     endStateTable();
  75 }
  76
  77 U_NAMESPACE_END