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Java example source code file (StateTables.h)

This example Java source code file (StateTables.h) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

byteoffset, classcode, classcodes, classtable, le_state_patience_count, le_state_patience_curr, le_state_patience_decr, le_state_patience_init, le_var_array, stateentry2, statetableheader2, ttglyphid, u_namespace_begin, u_namespace_end

The StateTables.h Java example source code

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 *
 */

/*
 *
 * (C) Copyright IBM Corp. 1998-2013 - All Rights Reserved
 *
 */

#ifndef __STATETABLES_H
#define __STATETABLES_H

/**
 * \file
 * \internal
 */

#include "LETypes.h"
#include "LayoutTables.h"

U_NAMESPACE_BEGIN




/*
 * State table loop detection.
 * Detects if too many ( LE_STATE_PATIENCE_COUNT ) state changes occur without moving the glyph index 'g'.
 *
 * Usage (pseudocode):
 *
 * {
 *   LE_STATE_PATIENCE_INIT();
 *
 *   int g=0; // the glyph index - expect it to be moving
 *
 *   for(;;) {
 *     if(LE_STATE_PATIENCE_DECR()) { // decrements the patience counter
 *        // ran out of patience, get out.
 *        break;
 *     }
 *
 *     LE_STATE_PATIENCE_CURR(int, g); // store the 'current'
 *     state = newState(state,g);
 *     g+= <something, could be zero>;
 *     LE_STATE_PATIENCE_INCR(g);  // if g has moved, increment the patience counter. Otherwise leave it.
 *   }
 *
 */

#define LE_STATE_PATIENCE_COUNT 4096 /**< give up if a state table doesn't move the glyph after this many iterations */
#define LE_STATE_PATIENCE_INIT()  le_uint32 le_patience_count = LE_STATE_PATIENCE_COUNT
#define LE_STATE_PATIENCE_DECR()  --le_patience_count==0
#define LE_STATE_PATIENCE_CURR(type,x)  type le_patience_curr=(x)
#define LE_STATE_PATIENCE_INCR(x)    if((x)!=le_patience_curr) ++le_patience_count;


struct StateTableHeader
{
    le_int16 stateSize;
    ByteOffset classTableOffset;
    ByteOffset stateArrayOffset;
    ByteOffset entryTableOffset;
};

struct StateTableHeader2
{
    le_uint32 nClasses;
    le_uint32 classTableOffset;
    le_uint32 stateArrayOffset;
    le_uint32 entryTableOffset;
};

enum ClassCodes
{
    classCodeEOT = 0,
    classCodeOOB = 1,
    classCodeDEL = 2,
    classCodeEOL = 3,
    classCodeFirstFree = 4,
    classCodeMAX = 0xFF
};

typedef le_uint8 ClassCode;

struct ClassTable
{
    TTGlyphID firstGlyph;
    le_uint16 nGlyphs;
    ClassCode classArray[ANY_NUMBER];
};
LE_VAR_ARRAY(ClassTable, classArray)

enum StateNumber
{
    stateSOT        = 0,
    stateSOL        = 1,
    stateFirstFree  = 2,
    stateMAX        = 0xFF
};

typedef le_uint8 EntryTableIndex;

struct StateEntry
{
    ByteOffset  newStateOffset;
    le_int16    flags;
};

typedef le_uint16 EntryTableIndex2;

struct StateEntry2 // same struct different interpretation
{
    le_uint16    newStateIndex;
    le_uint16    flags;
};

U_NAMESPACE_END
#endif

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