#include "utf.h"
/*****************************************************************************
* 函数名：enc_get_utf8_size
* 将一个字符的UTF8编码转换成Unicode(UCS-2和UCS-4)编码.
*
* 参数:
* pInput 指向输入缓冲区, 以UTF-8编码
*
*
* 返回值:
* 成功则返回该字符的UTF8编码所占用的字节数; 失败则返回0.
* 注意事项：无
******************************************************************************/
int enc_get_utf8_size(const unsigned char pInput)
{
unsigned char c = pInput;
// 0xxxxxxx 返回0
// 10xxxxxx 不存在
// 110xxxxx 返回2
// 1110xxxx 返回3
// 11110xxx 返回4
// 111110xx 返回5
// 1111110x 返回6
if(c< 0x80) return 0;
if(c>=0x80 && c<0xC0) return -1;
if(c>=0xC0 && c<0xE0) return 2;
if(c>=0xE0 && c<0xF0) return 3;
if(c>=0xF0 && c<0xF8) return 4;
if(c>=0xF8 && c<0xFC) return 5;
if(c>=0xFC) return 6;
return -1;
}
/*****************************************************************************
* 函数名：enc_utf8_to_unicode_one
* 将一个字符的UTF8编码转换成Unicode(UCS-2和UCS-4)编码.
*
* 参数:
* pInput 指向输入缓冲区, 以UTF-8编码
* Unic 指向输出缓冲区, 其保存的数据即是Unicode编码值,
* 类型为unsigned long .
*
* 返回值:
* 成功则返回该字符的UTF8编码所占用的字节数; 失败则返回0.
*
* 注意事项:
* 1. UTF8没有字节序问题, 但是Unicode有字节序要求;
* 字节序分为大端(Big Endian)和小端(Little Endian)两种;
* 在Intel处理器中采用小端法表示, 在此采用小端法表示. (低地址存低位)
****************************************************************************/
int enc_utf8_to_unicode_one(const unsigned char* pInput, unsigned long *Unic)
{
assert(pInput != NULL && Unic != NULL);
// b1 表示UTF-8编码的pInput中的高字节, b2 表示次高字节, ...
char b1, b2, b3, b4, b5, b6;
*Unic = 0x0; // 把 *Unic 初始化为全零
int utfbytes = enc_get_utf8_size(*pInput);
//int utfbytes = 3;
unsigned char *pOutput = (unsigned char *) Unic;
switch ( utfbytes )
{
case 0:
*pOutput = *pInput;
utfbytes += 1;
break;
case 2:
b1 = *pInput;
b2 = *(pInput + 1);
if ( (b2 & 0xE0) != 0x80 )
return 0;
*pOutput = (b1 << 6) + (b2 & 0x3F);
*(pOutput+1) = (b1 >> 2) & 0x07;
break;
case 3:
b1 = *pInput;
b2 = *(pInput + 1);
b3 = *(pInput + 2);
if ( ((b2 & 0xC0) != 0x80) || ((b3 & 0xC0) != 0x80) )
return 0;
*pOutput = (b2 << 6) + (b3 & 0x3F);
*(pOutput+1) = (b1 << 4) + ((b2 >> 2) & 0x0F);
break;
case 4:
b1 = *pInput;
b2 = *(pInput + 1);
b3 = *(pInput + 2);
b4 = *(pInput + 3);
if ( ((b2 & 0xC0) != 0x80) || ((b3 & 0xC0) != 0x80)
|| ((b4 & 0xC0) != 0x80) )
return 0;
*pOutput = (b3 << 6) + (b4 & 0x3F);
*(pOutput+1) = (b2 << 4) + ((b3 >> 2) & 0x0F);
*(pOutput+2) = ((b1 << 2) & 0x1C) + ((b2 >> 4) & 0x03);
break;
case 5:
b1 = *pInput;
b2 = *(pInput + 1);
b3 = *(pInput + 2);
b4 = *(pInput + 3);
b5 = *(pInput + 4);
if ( ((b2 & 0xC0) != 0x80) || ((b3 & 0xC0) != 0x80)
|| ((b4 & 0xC0) != 0x80) || ((b5 & 0xC0) != 0x80) )
return 0;
*pOutput = (b4 << 6) + (b5 & 0x3F);
*(pOutput+1) = (b3 << 4) + ((b4 >> 2) & 0x0F);
*(pOutput+2) = (b2 << 2) + ((b3 >> 4) & 0x03);
*(pOutput+3) = (b1 << 6);
break;
case 6:
b1 = *pInput;
b2 = *(pInput + 1);
b3 = *(pInput + 2);
b4 = *(pInput + 3);
b5 = *(pInput + 4);
b6 = *(pInput + 5);
if ( ((b2 & 0xC0) != 0x80) || ((b3 & 0xC0) != 0x80)
|| ((b4 & 0xC0) != 0x80) || ((b5 & 0xC0) != 0x80)
|| ((b6 & 0xC0) != 0x80) )
return 0;
*pOutput = (b5 << 6) + (b6 & 0x3F);
*(pOutput+1) = (b5 << 4) + ((b6 >> 2) & 0x0F);
*(pOutput+2) = (b3 << 2) + ((b4 >> 4) & 0x03);
*(pOutput+3) = ((b1 << 6) & 0x40) + (b2 & 0x3F);
break;
default:
return 0;
break;
}
return utfbytes;
}
/*****************************************************************************
* 函数名：enc_unicode_to_utf8_one
* 将一个字符的Unicode(UCS-2和UCS-4)编码转换成UTF-8编码.
*
* 参数:
* unic 字符的Unicode编码值
* pOutput 指向输出的用于存储UTF8编码值的缓冲区的指针
* outsize pOutput缓冲的大小
*
* 返回值:
* 返回转换后的字符的UTF8编码所占的字节数, 如果出错则返回 0 .
*
* 注意事项:
* 1. UTF8没有字节序问题, 但是Unicode有字节序要求;
* 字节序分为大端(Big Endian)和小端(Little Endian)两种;
* 在Intel处理器中采用小端法表示, 在此采用小端法表示. (低地址存低位)
* 2. 请保证 pOutput 缓冲区有最少有 6 字节的空间大小!
****************************************************************************/
int enc_unicode_to_utf8_one(unsigned long unic, unsigned char *pOutput,
int outSize)
{
assert(pOutput != NULL);
assert(outSize >= 6);
if ( unic <= 0x0000007F )
{
// * U-00000000 - U-0000007F: 0xxxxxxx
*pOutput = (unic & 0x7F);
return 1;
}
else if ( unic >= 0x00000080 && unic <= 0x000007FF )
{
// * U-00000080 - U-000007FF: 110xxxxx 10xxxxxx
*(pOutput+1) = (unic & 0x3F) | 0x80;
*pOutput = ((unic >> 6) & 0x1F) | 0xC0;
return 2;
}
else if ( unic >= 0x00000800 && unic <= 0x0000FFFF )
{
// * U-00000800 - U-0000FFFF: 1110xxxx 10xxxxxx 10xxxxxx
*(pOutput+2) = (unic & 0x3F) | 0x80;
*(pOutput+1) = ((unic >> 6) & 0x3F) | 0x80;
*pOutput = ((unic >> 12) & 0x0F) | 0xE0;
return 3;
}
else if ( unic >= 0x00010000 && unic <= 0x001FFFFF )
{
// * U-00010000 - U-001FFFFF: 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
*(pOutput+3) = (unic & 0x3F) | 0x80;
*(pOutput+2) = ((unic >> 6) & 0x3F) | 0x80;
*(pOutput+1) = ((unic >> 12) & 0x3F) | 0x80;
*pOutput = ((unic >> 18) & 0x07) | 0xF0;
return 4;
}
else if ( unic >= 0x00200000 && unic <= 0x03FFFFFF )
{
// * U-00200000 - U-03FFFFFF: 111110xx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
*(pOutput+4) = (unic & 0x3F) | 0x80;
*(pOutput+3) = ((unic >> 6) & 0x3F) | 0x80;
*(pOutput+2) = ((unic >> 12) & 0x3F) | 0x80;
*(pOutput+1) = ((unic >> 18) & 0x3F) | 0x80;
*pOutput = ((unic >> 24) & 0x03) | 0xF8;
return 5;
}
else if ( unic >= 0x04000000 && unic <= 0x7FFFFFFF )
{
// * U-04000000 - U-7FFFFFFF: 1111110x 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
*(pOutput+5) = (unic & 0x3F) | 0x80;
*(pOutput+4) = ((unic >> 6) & 0x3F) | 0x80;
*(pOutput+3) = ((unic >> 12) & 0x3F) | 0x80;
*(pOutput+2) = ((unic >> 18) & 0x3F) | 0x80;
*(pOutput+1) = ((unic >> 24) & 0x3F) | 0x80;
*pOutput = ((unic >> 30) & 0x01) | 0xFC;
return 6;
}
return 0;
}
/*****************************************************************************
* 函数名：init_utf8
* 将字库文件读取到缓存区
*
* 参数:
* info 缓存区数据结构
*
* 返回值:
* 无
*
* 注意事项：
* 无
*
****************************************************************************/
void init_utf8(UTF8_INFO *info)
{
int ret = 0 ;
int fd = open(info->path,O_RDONLY);
if(-1 == fd)
{
exit(1);
}
struct stat st;
re
