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
16U_NAMESPACE_BEGIN
17
18StateTableProcessor::StateTableProcessor()
19{
20}
21
22StateTableProcessor::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
37StateTableProcessor::~StateTableProcessor()
38{
39}
40
41void 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
77U_NAMESPACE_END
78