xref: /external/icu/icu4c/source/layout/StateTableProcessor2.cpp

/*
 *
 * (C) Copyright IBM Corp.  and others 1998-2014 - All Rights Reserved
 *
 */

#include "LETypes.h"
#include "MorphTables.h"
#include "StateTables.h"
#include "MorphStateTables.h"
#include "SubtableProcessor2.h"
#include "StateTableProcessor2.h"
#include "LEGlyphStorage.h"
#include "LESwaps.h"
#include "LookupTables.h"

U_NAMESPACE_BEGIN

StateTableProcessor2::StateTableProcessor2()
{
}

StateTableProcessor2::StateTableProcessor2(const LEReferenceTo<MorphSubtableHeader2> &morphSubtableHeader, LEErrorCode &success)
  : SubtableProcessor2(morphSubtableHeader, success),
    dir(1),
    format(0),
    nClasses(0),
    classTableOffset(0),
    stateArrayOffset(0),
    entryTableOffset(0),
    classTable(),
    stateArray(),
    stateTableHeader(morphSubtableHeader, success),
    stHeader(stateTableHeader, success, (const StateTableHeader2*)&stateTableHeader->stHeader)
{
  if (LE_FAILURE(success)) {
    return;
  }
  nClasses = SWAPL(stHeader->nClasses);
  classTableOffset = SWAPL(stHeader->classTableOffset);
  stateArrayOffset = SWAPL(stHeader->stateArrayOffset);
  entryTableOffset = SWAPL(stHeader->entryTableOffset);

  classTable = LEReferenceTo<LookupTable>(stHeader, success, classTableOffset);
  format = SWAPW(classTable->format);

  stateArray = LEReferenceToArrayOf<EntryTableIndex2>(stHeader, success, stateArrayOffset, LE_UNBOUNDED_ARRAY);
}

StateTableProcessor2::~StateTableProcessor2()
{
}

void StateTableProcessor2::process(LEGlyphStorage &glyphStorage, LEErrorCode &success)
{
    if (LE_FAILURE(success)) return;
    // Start at state 0
    // XXX: How do we know when to start at state 1?
    le_uint16 currentState = 0;
    le_int32 glyphCount = glyphStorage.getGlyphCount();

    LE_STATE_PATIENCE_INIT();

    le_int32 currGlyph = 0;
    if ((coverage & scfReverse2) != 0) {  // process glyphs in descending order
        currGlyph = glyphCount - 1;
        dir = -1;
    } else {
        dir = 1;
    }

    beginStateTable();
    switch (format) {
        case ltfSimpleArray: {
#ifdef TEST_FORMAT
          LEReferenceTo<SimpleArrayLookupTable> lookupTable0(classTable, success);
          if(LE_FAILURE(success)) break;
            while ((dir == 1 && currGlyph <= glyphCount) || (dir == -1 && currGlyph >= -1)) {
                if (LE_FAILURE(success)) break;
                if (LE_STATE_PATIENCE_DECR()) {
                  LE_DEBUG_BAD_FONT("patience exceeded - state table not moving")
                  break; // patience exceeded.
                }
                LookupValue classCode = classCodeOOB;
                if (currGlyph == glyphCount || currGlyph == -1) {
                    // XXX: How do we handle EOT vs. EOL?
                    classCode = classCodeEOT;
                } else {
                    LEGlyphID gid = glyphStorage[currGlyph];
                    TTGlyphID glyphCode = (TTGlyphID) LE_GET_GLYPH(gid);

                    if (glyphCode == 0xFFFF) {
                        classCode = classCodeDEL;
                    } else {
                        classCode = SWAPW(lookupTable0->valueArray[gid]);
                    }
                }
                EntryTableIndex2 entryTableIndex = SWAPW(stateArray(classCode + currentState * nClasses, success));
                LE_STATE_PATIENCE_CURR(le_int32, currGlyph);
                currentState = processStateEntry(glyphStorage, currGlyph, entryTableIndex); // return a zero-based index instead of a byte offset
                LE_STATE_PATIENCE_INCR(currGlyph);
            }
#endif
            break;
        }
        case ltfSegmentSingle: {
          LEReferenceTo<SegmentSingleLookupTable> lookupTable2(classTable, success);
          if(LE_FAILURE(success)) break;
            while ((dir == 1 && currGlyph <= glyphCount) || (dir == -1 && currGlyph >= -1)) {
                if (LE_FAILURE(success)) break;
                if (LE_STATE_PATIENCE_DECR()) {
                  LE_DEBUG_BAD_FONT("patience exceeded  - state table not moving")
                  break; // patience exceeded.
                }
                LookupValue classCode = classCodeOOB;
                if (currGlyph == glyphCount || currGlyph == -1) {
                    // XXX: How do we handle EOT vs. EOL?
                    classCode = classCodeEOT;
                } else {
                    LEGlyphID gid = glyphStorage[currGlyph];
                    TTGlyphID glyphCode = (TTGlyphID) LE_GET_GLYPH(gid);

                    if (glyphCode == 0xFFFF) {
                        classCode = classCodeDEL;
                    } else {
                      const LookupSegment *segment =
                        lookupTable2->lookupSegment(lookupTable2, lookupTable2->segments, gid, success);
                        if (segment != NULL && LE_SUCCESS(success)) {
                            classCode = SWAPW(segment->value);
                        }
                    }
                }
                EntryTableIndex2 entryTableIndex = SWAPW(stateArray(classCode + currentState * nClasses,success));
                LE_STATE_PATIENCE_CURR(le_int32, currGlyph);
                currentState = processStateEntry(glyphStorage, currGlyph, entryTableIndex, success);
                LE_STATE_PATIENCE_INCR(currGlyph);
            }
            break;
        }
        case ltfSegmentArray: {
          //printf("Lookup Table Format4: specific interpretation needed!\n");
            break;
        }
        case ltfSingleTable: {
            LEReferenceTo<SingleTableLookupTable> lookupTable6(classTable, success);
            while ((dir == 1 && currGlyph <= glyphCount) || (dir == -1 && currGlyph >= -1)) {
                if (LE_FAILURE(success)) break;
                if (LE_STATE_PATIENCE_DECR()) {
                  LE_DEBUG_BAD_FONT("patience exceeded - state table not moving")
                  break; // patience exceeded.
                }
                LookupValue classCode = classCodeOOB;
                if (currGlyph == glyphCount || currGlyph == -1) {
                    // XXX: How do we handle EOT vs. EOL?
                    classCode = classCodeEOT;
                } else if(currGlyph > glyphCount) {
                  // note if > glyphCount, we've run off the end (bad font)
                  currGlyph = glyphCount;
                  classCode = classCodeEOT;
                } else {
                    LEGlyphID gid = glyphStorage[currGlyph];
                    TTGlyphID glyphCode = (TTGlyphID) LE_GET_GLYPH(gid);

                    if (glyphCode == 0xFFFF) {
                        classCode = classCodeDEL;
                    } else {
                      const LookupSingle *segment = lookupTable6->lookupSingle(lookupTable6, lookupTable6->entries, gid, success);
                        if (segment != NULL) {
                            classCode = SWAPW(segment->value);
                        }
                    }
                }
                EntryTableIndex2 entryTableIndex = SWAPW(stateArray(classCode + currentState * nClasses, success));
                LE_STATE_PATIENCE_CURR(le_int32, currGlyph);
                currentState = processStateEntry(glyphStorage, currGlyph, entryTableIndex, success);
                LE_STATE_PATIENCE_INCR(currGlyph);
            }
            break;
        }
        case ltfTrimmedArray: {
            LEReferenceTo<TrimmedArrayLookupTable> lookupTable8(classTable, success);
            if (LE_FAILURE(success)) break;
            TTGlyphID firstGlyph = SWAPW(lookupTable8->firstGlyph);
            TTGlyphID lastGlyph  = firstGlyph + SWAPW(lookupTable8->glyphCount);

            while ((dir == 1 && currGlyph <= glyphCount) || (dir == -1 && currGlyph >= -1)) {
                if(LE_STATE_PATIENCE_DECR()) {
                  LE_DEBUG_BAD_FONT("patience exceeded - state table not moving")
                  break; // patience exceeded.
                }

                LookupValue classCode = classCodeOOB;
                if (currGlyph == glyphCount || currGlyph == -1) {
                    // XXX: How do we handle EOT vs. EOL?
                    classCode = classCodeEOT;
                } else {
                    TTGlyphID glyphCode = (TTGlyphID) LE_GET_GLYPH(glyphStorage[currGlyph]);
                    if (glyphCode == 0xFFFF) {
                        classCode = classCodeDEL;
                    } else if ((glyphCode >= firstGlyph) && (glyphCode < lastGlyph)) {
                        classCode = SWAPW(lookupTable8->valueArray[glyphCode - firstGlyph]);
                    }
                }
                EntryTableIndex2 entryTableIndex = SWAPW(stateArray(classCode + currentState * nClasses, success));
                LE_STATE_PATIENCE_CURR(le_int32, currGlyph);
                currentState = processStateEntry(glyphStorage, currGlyph, entryTableIndex, success);
                LE_STATE_PATIENCE_INCR(currGlyph);
            }
            break;
        }
        default:
            break;
    }

    endStateTable();
}

U_NAMESPACE_END