晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 sh-3ll

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DIR:/opt/alt/libicu65/usr/share/doc/alt-libicu65-devel/samples/layout/
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/*
 *************************************************************************
 *   © 2016 and later: Unicode, Inc. and others.
 *   License & terms of use: http://www.unicode.org/copyright.html#License
 *************************************************************************
 *************************************************************************
 *   Copyright (C) 2003 - 2008, International Business Machines
 *   Corporation and others.  All Rights Reserved.
 *************************************************************************
 */

#include "layout/LETypes.h"

#include "FontTableCache.h"

#define TABLE_CACHE_INIT 5
#define TABLE_CACHE_GROW 5

struct FontTableCacheEntry
{
    LETag tag;
    const void *table;
};

FontTableCache::FontTableCache()
    : fTableCacheCurr(0), fTableCacheSize(TABLE_CACHE_INIT)
{
    fTableCache = LE_NEW_ARRAY(FontTableCacheEntry, fTableCacheSize);

    if (fTableCache == NULL) {
        fTableCacheSize = 0;
        return;
    }

    for (int i = 0; i < fTableCacheSize; i += 1) {
        fTableCache[i].tag   = 0;
        fTableCache[i].table = NULL;
    }
}

FontTableCache::~FontTableCache()
{
    for (int i = fTableCacheCurr - 1; i >= 0; i -= 1) {
        freeFontTable(fTableCache[i].table);

        fTableCache[i].tag   = 0;
        fTableCache[i].table = NULL;
    }

    fTableCacheCurr = 0;

    LE_DELETE_ARRAY(fTableCache);
    fTableCache = NULL;
}

void FontTableCache::freeFontTable(const void *table) const
{
    LE_DELETE_ARRAY(table);
}

const void *FontTableCache::find(LETag tableTag) const
{
    for (int i = 0; i < fTableCacheCurr; i += 1) {
        if (fTableCache[i].tag == tableTag) {
            return fTableCache[i].table;
        }
    }

    const void *table = readFontTable(tableTag);

    ((FontTableCache *) this)->add(tableTag, table);

    return table;
}

void FontTableCache::add(LETag tableTag, const void *table)
{
    if (fTableCacheCurr >= fTableCacheSize) {
        le_int32 newSize = fTableCacheSize + TABLE_CACHE_GROW;

        fTableCache = (FontTableCacheEntry *) LE_GROW_ARRAY(fTableCache, newSize);

        for (le_int32 i = fTableCacheSize; i < newSize; i += 1) {
            fTableCache[i].tag   = 0;
            fTableCache[i].table = NULL;
        }

        fTableCacheSize = newSize;
    }

    fTableCache[fTableCacheCurr].tag   = tableTag;
    fTableCache[fTableCacheCurr].table = table;

    fTableCacheCurr += 1;
}