我试图将UTF-16字符串(从spidermonkey 19中的JSString获得)转换为UTF-8字符串。我认为转换的字符串是可以的,但由于某种原因,转换例程为每个unicode(非ascii)字符添加了两个额外的字节。我很确定我做错了什么,我尝试了不同的编码,但没有好的结果。这就是我现在越来越:从UTF-16转换为UTF-8的问题
// UTF-16 string "áéíóúñ aeiou", this is the string being converted
// (you can find "aeiou" after \x20\x00, where \x61\x00 is "a")
\xC3\x00\xA1\x00\xC3\x00\xA9\x00\xC3\x00\xAD\x00\xC3\x00\xB3\x00\xC3\x00\xBA\x00\xC3\x00\xB1\x00\x20\x00\x61\x00\x65\x00\x69\x00\x6F\x00\x75\x00\x6E\x00
// UTF-8 string, test string, taken from:
// const char* cmp = "áéíóúñ aeiou"
// This is the result I'm looking for.
\xc3\xa1\xc3\xa9\xc3\xad\xc3\xb3\xc3\xba\xc3\xb1 aeiou
// UTF-8 string I'm getting after iconv(utf16, utf8)
\xc3\x83\xc2\xa1\xc3\x83\xc2\xa9\xc3\x83\xc2\xad\xc3\x83\xc2\xb3\xc3\x83\xc2\xba\xc3\x83\xc2\xb1 aeioun
正如你所看到的,也有每个非ASCII字符之间的两个额外的字节(\ X83 \ XC2)。任何人都知道这是为什么?
这是我的转换例程:
shared_ptr<char> convertToUTF8(char* utf16string, size_t len) {
iconv_t cd = iconv_open("UTF-8", "UTF-16LE");
char* utf8;
size_t utf8len;
utf8len = len;
utf8 = (char *)calloc(utf8len, 1);
shared_ptr<char> outptr(utf8);
size_t converted = iconv(cd, &utf16string, &len, &utf8, &utf8len);
if (converted == (size_t)-1) {
fprintf(stderr, "iconv failed\n");
switch (errno) {
case EILSEQ:
fprintf(stderr, "Invalid multibyte sequence.\n");
break;
case EINVAL:
fprintf(stderr, "Incomplete multibyte sequence.\n");
break;
case E2BIG:
fprintf(stderr, "No more room (iconv).\n");
break;
default:
fprintf(stderr, "Error: %s.\n", strerror(errno));
break;
}
outptr = NULL;
}
iconv_close(cd);
assert(outptr);
return outptr;
}
我也尝试了解决方案this other question,但我得到了完全相同的结果。任何想法为什么iconv增加额外的两个字节?我如何将结果与手动创建的utf-8字符串进行匹配?
编辑:测试字符串