cjk_ime.c

本程序在S3C44B0 uClinux的嵌入式GUI

#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>

/* #include <arpa/ftp.h>	<--- unused? */

#include <signal.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <ctype.h>
#include <netdb.h>
#include <pwd.h>

#include <linux/ppw.h>

#include "cjk_ime.h"

#define ICON_SIZE	28

static int fd_ime;	// the file handle of current IME data file
static Ime_Header_Info ime_header_info;	// to record the file header
static Kb_Info		kb_info;	 // information of the key boarde
static Key_Info  *key_info=0;	  // information  of the key
static UInt8 icon[ICON_SIZE];		// to record the icon
static char *letter_list;	// the string table
static UInt16	*t_offset=0;	// data offset
static int start_addr_of_contents;		// start address in DAT file of contents
static unsigned short result_string[256];	// store the result CJK string
/***************************************************
 *
 *	Initial the CJK ime engine,return -1 if failed
 *
 ***************************************************/
int init_cjk_ime(void)
{
	int s_size;
	
	// Open the ime data file
	fd_ime = open(IME_DATA_FILE_GB_PY,O_RDONLY);
	if (fd_ime < 0) return -1;

	// read the data file header
	if (read(fd_ime,&ime_header_info,sizeof(Ime_Header_Info)) != sizeof(Ime_Header_Info))
		return -1;
	ime_header_info.max_keys = htonl(ime_header_info.max_keys);
	ime_header_info.nr_codes = htonl(ime_header_info.nr_codes);

	//printf("sizeof ime_header:%d\n",sizeof(Ime_Header_Info));
	// Check the magic number, if not matched that means the file is not a valid data file	
	if (ime_header_info.magic_number != DAT_FILE_MAGIC_NUMBER)
		return -1;

	read(fd_ime,&kb_info,sizeof(Kb_Info));
	kb_info.nr_keys = htons(kb_info.nr_keys);
	kb_info.bmp_width = htons(kb_info.bmp_width);
	kb_info.bmp_height = htons(kb_info.bmp_height);
	kb_info.bmp_bits = htons(kb_info.bmp_bits);
	kb_info.bmp_length = htonl(kb_info.bmp_length);
	
	/*printf("sizeof Kb_Info:%d,nr_keys:%d,width:%d,height:%d,bits:%d,length:%d\n",
		sizeof(Kb_Info),kb_info.nr_keys,
		kb_info.bmp_width,kb_info.bmp_height,kb_info.bmp_bits,kb_info.bmp_length);
	*/
	//printf("sizeof bmp:%d\n",kb_info.bmp_length);
	//Ime_Bmp=malloc(kb_info.bmp_length);	
	//read(fd_ime,Ime_Bmp,kb_info.bmp_length);
	lseek(fd_ime,kb_info.bmp_length,SEEK_CUR);
			
	// read  out the icon bmp 
	read(fd_ime,icon,ICON_SIZE );
	/*
	{
		int i;
		printf("icon:");
		for (i = 0;i < 28;i++)
			printf("%02x,",icon[i]);
		printf("\n");
	}
	*/
	
	// read out the key information 	
	s_size=kb_info.nr_keys*sizeof(Key_Info);
	key_info=malloc(s_size);
	read(fd_ime,key_info,s_size);

	// gets the original string table
	s_size=ime_header_info.max_keys*ime_header_info.nr_codes;
	letter_list = malloc(s_size);
	read(fd_ime,letter_list,s_size);
	/*
	{
		int i;
		
		printf("letter_list:");
		for (i = 0;i < 16;i++)
			printf("%c",letter_list[i]);
		printf("\n");
	}
	*/
	s_size= ime_header_info.nr_codes * sizeof(UInt16);
	t_offset=malloc(s_size);
	read(fd_ime,t_offset,s_size);
	
	start_addr_of_contents = lseek(fd_ime,0,SEEK_CUR);// begin addres  of codes 

}

// Close the IME data file & reset all of the recource
void close_cjk_ime(void)
{
	close(fd_ime);
	free(letter_list);
	free(key_info);
	free(t_offset);
}

// return the data offset in file, return -1 if false 
unsigned short* get_data_offset(char *key_str)
{
	int s_len,i,flag=0;
	char *t;
	int s_offset;
	
	s_len = strlen(key_str);
	if (s_len <= 0) return 0;
	
	t = letter_list;
	
	for (i=0;i<ime_header_info.nr_codes;i++)
	{
		if (strncmp(key_str,t,s_len) == 0)	// find the matched string
		{
			s_offset = *(t_offset+i);
			s_offset = (htons(s_offset)-1)*2;
			lseek(fd_ime,start_addr_of_contents+s_offset,0);
			if (read(fd_ime,result_string,sizeof(result_string)) < 0) return 0;
#if 0
			printf("Matched:%s,data_offset:%x,%x,\n",
				t,s_offset,start_addr_of_contents);
			{
				int k;
				for (k = 0;k < 10;k++)
					printf("%04x,",*(result_string+k));
				printf("\n");
			}
#endif
			return result_string;
		}
		t += ime_header_info.max_keys;
	}
	return 0;
}