Если вы просто хотите простое решение, используйте таблицу поиска - чтобы превратить диапазон 0x80-0xff в их эквиваленты в Юникоде. Смотрите код ниже. Если вы хотите многократно использовать это, подумайте над написанием собственного кода c в соответствии с UTF8Codec или Latin1Codec.
import 'package:http/http.dart' as http;
void main() async {
final response = await http.get(
'https://www.foodsdictionary.co.il/rss/recipes.xml',
);
var bytes = response.bodyBytes;
var length = bytes.length;
var codes = List<int>(length);
for (var i = 0; i < length; i++) {
var byte = bytes[i];
codes[i] = byte < 0x80 ? byte : table[byte - 0x80];
}
print(String.fromCharCodes(codes));
}
var table =
[
0x20AC, //EURO SIGN
0xFFED, //UNDEFINED
0x201A, //SINGLE LOW-9 QUOTATION MARK
0x0192, //LATIN SMALL LETTER F WITH HOOK
0x201E, //DOUBLE LOW-9 QUOTATION MARK
0x2026, //HORIZONTAL ELLIPSIS
0x2020, //DAGGER
0x2021, //DOUBLE DAGGER
0x02C6, //MODIFIER LETTER CIRCUMFLEX ACCENT
0x2030, //PER MILLE SIGN
0xFFED, //UNDEFINED
0x2039, //SINGLE LEFT-POINTING ANGLE QUOTATION MARK
0xFFED, //UNDEFINED
0xFFED, //UNDEFINED
0xFFED, //UNDEFINED
0xFFED, //UNDEFINED
0xFFED, //UNDEFINED
0x2018, //LEFT SINGLE QUOTATION MARK
0x2019, //RIGHT SINGLE QUOTATION MARK
0x201C, //LEFT DOUBLE QUOTATION MARK
0x201D, //RIGHT DOUBLE QUOTATION MARK
0x2022, //BULLET
0x2013, //EN DASH
0x2014, //EM DASH
0x02DC, //SMALL TILDE
0x2122, //TRADE MARK SIGN
0xFFED, //UNDEFINED
0x203A, //SINGLE RIGHT-POINTING ANGLE QUOTATION MARK
0xFFED, //UNDEFINED
0xFFED, //UNDEFINED
0xFFED, //UNDEFINED
0xFFED, //UNDEFINED
0x00A0, //NO-BREAK SPACE
0x00A1, //INVERTED EXCLAMATION MARK
0x00A2, //CENT SIGN
0x00A3, //POUND SIGN
0x20AA, //NEW SHEQEL SIGN
0x00A5, //YEN SIGN
0x00A6, //BROKEN BAR
0x00A7, //SECTION SIGN
0x00A8, //DIAERESIS
0x00A9, //COPYRIGHT SIGN
0x00D7, //MULTIPLICATION SIGN
0x00AB, //LEFT-POINTING DOUBLE ANGLE QUOTATION MARK
0x00AC, //NOT SIGN
0x00AD, //SOFT HYPHEN
0x00AE, //REGISTERED SIGN
0x00AF, //MACRON
0x00B0, //DEGREE SIGN
0x00B1, //PLUS-MINUS SIGN
0x00B2, //SUPERSCRIPT TWO
0x00B3, //SUPERSCRIPT THREE
0x00B4, //ACUTE ACCENT
0x00B5, //MICRO SIGN
0x00B6, //PILCROW SIGN
0x00B7, //MIDDLE DOT
0x00B8, //CEDILLA
0x00B9, //SUPERSCRIPT ONE
0x00F7, //DIVISION SIGN
0x00BB, //RIGHT-POINTING DOUBLE ANGLE QUOTATION MARK
0x00BC, //VULGAR FRACTION ONE QUARTER
0x00BD, //VULGAR FRACTION ONE HALF
0x00BE, //VULGAR FRACTION THREE QUARTERS
0x00BF, //INVERTED QUESTION MARK
0x05B0, //HEBREW POINT SHEVA
0x05B1, //HEBREW POINT HATAF SEGOL
0x05B2, //HEBREW POINT HATAF PATAH
0x05B3, //HEBREW POINT HATAF QAMATS
0x05B4, //HEBREW POINT HIRIQ
0x05B5, //HEBREW POINT TSERE
0x05B6, //HEBREW POINT SEGOL
0x05B7, //HEBREW POINT PATAH
0x05B8, //HEBREW POINT QAMATS
0x05B9, //HEBREW POINT HOLAM
0xFFED, //UNDEFINED
0x05BB, //HEBREW POINT QUBUTS
0x05BC, //HEBREW POINT DAGESH OR MAPIQ
0x05BD, //HEBREW POINT METEG
0x05BE, //HEBREW PUNCTUATION MAQAF
0x05BF, //HEBREW POINT RAFE
0x05C0, //HEBREW PUNCTUATION PASEQ
0x05C1, //HEBREW POINT SHIN DOT
0x05C2, //HEBREW POINT SIN DOT
0x05C3, //HEBREW PUNCTUATION SOF PASUQ
0x05F0, //HEBREW LIGATURE YIDDISH DOUBLE VAV
0x05F1, //HEBREW LIGATURE YIDDISH VAV YOD
0x05F2, //HEBREW LIGATURE YIDDISH DOUBLE YOD
0x05F3, //HEBREW PUNCTUATION GERESH
0x05F4, //HEBREW PUNCTUATION GERSHAYIM
0xFFED, //UNDEFINED
0xFFED, //UNDEFINED
0xFFED, //UNDEFINED
0xFFED, //UNDEFINED
0xFFED, //UNDEFINED
0xFFED, //UNDEFINED
0xFFED, //UNDEFINED
0x05D0, //HEBREW LETTER ALEF
0x05D1, //HEBREW LETTER BET
0x05D2, //HEBREW LETTER GIMEL
0x05D3, //HEBREW LETTER DALET
0x05D4, //HEBREW LETTER HE
0x05D5, //HEBREW LETTER VAV
0x05D6, //HEBREW LETTER ZAYIN
0x05D7, //HEBREW LETTER HET
0x05D8, //HEBREW LETTER TET
0x05D9, //HEBREW LETTER YOD
0x05DA, //HEBREW LETTER FINAL KAF
0x05DB, //HEBREW LETTER KAF
0x05DC, //HEBREW LETTER LAMED
0x05DD, //HEBREW LETTER FINAL MEM
0x05DE, //HEBREW LETTER MEM
0x05DF, //HEBREW LETTER FINAL NUN
0x05E0, //HEBREW LETTER NUN
0x05E1, //HEBREW LETTER SAMEKH
0x05E2, //HEBREW LETTER AYIN
0x05E3, //HEBREW LETTER FINAL PE
0x05E4, //HEBREW LETTER PE
0x05E5, //HEBREW LETTER FINAL TSADI
0x05E6, //HEBREW LETTER TSADI
0x05E7, //HEBREW LETTER QOF
0x05E8, //HEBREW LETTER RESH
0x05E9, //HEBREW LETTER SHIN
0x05EA, //HEBREW LETTER TAV
0xFFED, //UNDEFINED
0xFFED, //UNDEFINED
0x200E, //LEFT-TO-RIGHT MARK
0x200F, //RIGHT-TO-LEFT MARK
0xFFED, //UNDEFINED
];