Encode by gbk

最新推荐文章于 2023-07-08 09:52:45 发布

原创最新推荐文章于 2023-07-08 09:52:45 发布 · 543 阅读

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本文介绍了一种检测字符串是否为GBK编码的方法，并提供了一个将Unicode字符串转换为GBK编码的实现。通过具体的代码示例，展示了如何判断字符串的编码类型及进行相应的编码转换。

- (BOOL)isEncodeGBK:(unichar *)str len:(int)len
{
assert(str);
BOOL isGBK = YES;
BOOL isAllAscii = YES;
for (int i = 0; i < len; i++) {
if (str[i]&0xff80) {
isAllAscii = NO;

if (str[i] > 0x80 && str[i] < 0xFE) {
i++;
} else {
isGBK = NO;
break;
}
}
}

return (!isAllAscii && isGBK);
}

- (NSString *)encodeByGBK
{
uint len = [self length];
NSString *string = nil;
char *s = NULL;

if (len <= 0) {
return nil;
}

unichar *unistr = (unichar *)malloc(len*sizeof(unichar));
if (!unistr) goto _EXIT;

[self getCharacters:unistr];
if (![self isEncodeGBK:unistr len:len]) {
string = [NSString stringWithFormat:@"%@", self];
goto _EXIT;
}

s = (char *)malloc((len+1)*sizeof(unsigned char));
if (!s) goto _EXIT;

//conver short to unsigned char
for (int i = 0; i < len; i++) {
s[i] = unistr[i];
}
s[len]=0;

NSStringEncoding gbkEncoding = CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000);
string = [NSString stringWithCString:(const char *)s encoding:gbkEncoding];
_EXIT:
if (unistr) free(unistr);
if (s) free(s);
return string;
}