hzindex.c

汉字在计算机内存放分为两种情况

#include "stdio.h"
/*#include "malloc.h"*/
#include "string.h"
#include "hzindex.h"

#ifndef NULL
#define NULL 0
#endif

INDEX_STRUCT  *g_IndexTable = NULL;
static void   FillToBuf(void *,struct _hanzi_ *);
static void   ParseSectionToBuf(void *,struct _hanzi_ *);


static void  FillToBuf(void *buf,struct _hanzi_ *p)
{
   unsigned short *tb = (unsigned short *)buf;
   *tb = p->hzst.Val;
   tb++;
   *tb = p->hzed.Val;
   tb++;

   if((++p)->name[0] == '#')
     FillToBuf(tb,p);
   if( (p)->name[0] == '*')
     ParseSectionToBuf(tb,p);
}

static void   ParseSectionToBuf(void *buf,struct _hanzi_ *p)
{
 /*计算出中间的汉字内码，填入缓冲 */
 unsigned short *tb;
 unsigned char val;
 unsigned char tbuf[2];
 
 tb = (unsigned short *)buf;
 tbuf[0] = p->hzst.Low;
 for(val = p->hzst.High;val <= p->hzed.High;val++)
 {
    tbuf[1] = val;
    *tb = *(unsigned short *)tbuf;
    tb++;
 }
  if( (++p)->name[0] == '*')
     ParseSectionToBuf(tb,p);
  if((p)->name[0] == '#')
     FillToBuf(tb,p);
}

static void* GetLocal(int curlocal)
{
   int i;
   int curasc = 'a' + curlocal;
   for( i = 0;i < TABLE_UNITS -1;i++)
     if(HanziTable[i].name[0] == curasc)
     return  ( void *) & HanziTable[i];
   return  ( void *) & HanziTable[TABLE_UNITS -1];
}

/*
生成映离散表功能的索引结构
*/
int CreateIndex(void)
{

   int i;
   if(g_IndexTable != NULL)
   free((unsigned char*)g_IndexTable);

   g_IndexTable = (INDEX_STRUCT *)malloc(sizeof(INDEX_STRUCT));
   if(g_IndexTable == NULL)
   return 0;

   memset(g_IndexTable,0,sizeof(INDEX_STRUCT));

   for(i = 0;i < INDEX_SIZE;i++)
      g_IndexTable->index[i] = GetLocal(i);

   return 1;
}
/*
释放索引表
*/
void  DestroyIndex(void)
{
     if(g_IndexTable)
     {
        free(g_IndexTable);
        g_IndexTable = NULL;
      }
}
/*
 由输入拼音得到汉字的内码 ，一次只能输入一个汉字的拼音
*/
int   GetHzRangeBySpell(char *spell,void *hzbuf)
{
    struct _hanzi_  *p,*p2,*tp;
    int len ;
    int ret;

    if( (len = strlen(spell)) <= 0&&spell == NULL ) return 0;

    p = (struct _hanzi_ *)g_IndexTable->index[spell[0] - 'a'];/*找出查找界*/
    p2 = (struct _hanzi_ *)g_IndexTable->index[(spell[0] - 'a' + 1)];

    for(tp = p ;tp < p2;tp++)/*在查找界中搜索*/
    {
      ret =   strcmp(spell,(char *)tp->name) ;
      if( ret <  0)
       {
           if(tp->name[len] == '#')
           {
            FillToBuf(hzbuf,tp);
            return 1;
           }
       }
       else if(ret == 0)
       {
           ParseSectionToBuf(hzbuf,tp);
           return 1;
       }
     }
    return 0;
}