Utf32beBytesDecoder class
Convert UTF-32BE encoded bytes to codepoints by grouping 4 bytes to produce the unicode codepoint.
class Utf32beBytesDecoder extends Utf32BytesDecoder {
Utf32beBytesDecoder(List<int> utf32EncodedBytes, [int offset = 0,
int length, bool stripBom = true,
int replacementCodepoint = UNICODE_REPLACEMENT_CHARACTER_CODEPOINT]) :
super._fromListRangeIterator((new _ListRange(utf32EncodedBytes, offset,
length)).iterator(), replacementCodepoint) {
if (stripBom && hasUtf32beBom(utf32EncodedBytes, offset, length)) {
skip();
}
}
int decode() {
int value = utf32EncodedBytesIterator.next();
value = (value << 8) + utf32EncodedBytesIterator.next();
value = (value << 8) + utf32EncodedBytesIterator.next();
value = (value << 8) + utf32EncodedBytesIterator.next();
return value;
}
}
Extends
Utf32BytesDecoder > Utf32beBytesDecoder
Constructors
new Utf32beBytesDecoder(List<int> utf32EncodedBytes, [int offset = 0, int length, bool stripBom = true, int replacementCodepoint = UNICODE_REPLACEMENT_CHARACTER_CODEPOINT]) #
Utf32beBytesDecoder(List<int> utf32EncodedBytes, [int offset = 0,
int length, bool stripBom = true,
int replacementCodepoint = UNICODE_REPLACEMENT_CHARACTER_CODEPOINT]) :
super._fromListRangeIterator((new _ListRange(utf32EncodedBytes, offset,
length)).iterator(), replacementCodepoint) {
if (stripBom && hasUtf32beBom(utf32EncodedBytes, offset, length)) {
skip();
}
}
Properties
final int position #
inherited from Utf32BytesDecoder
int get position => utf32EncodedBytesIterator.position ~/ 4;
final int remaining #
inherited from Utf32BytesDecoder
int get remaining => (utf32EncodedBytesIterator.remaining + 3) ~/ 4;
final _ListRangeIterator utf32EncodedBytesIterator #
inherited from Utf32BytesDecoder
final _ListRangeIterator utf32EncodedBytesIterator;
Methods
void backup([int by = 1]) #
inherited from Utf32BytesDecoder
void backup([int by = 1]) {
utf32EncodedBytesIterator.backup(4 * by);
}
int decode() #
int decode() {
int value = utf32EncodedBytesIterator.next();
value = (value << 8) + utf32EncodedBytesIterator.next();
value = (value << 8) + utf32EncodedBytesIterator.next();
value = (value << 8) + utf32EncodedBytesIterator.next();
return value;
}
List<int> decodeRest() #
inherited from Utf32BytesDecoder
List<int> decodeRest() {
List<int> codeunits = new List<int>(remaining);
int i = 0;
while (hasNext()) {
codeunits[i++] = next();
}
return codeunits;
}
bool hasNext() #
inherited from Utf32BytesDecoder
int next() #
inherited from Utf32BytesDecoder
Gets the next element in the iteration. Throws a
NoMoreElementsException if no element is left.
int next() {
if (utf32EncodedBytesIterator.remaining < 4) {
utf32EncodedBytesIterator.skip(utf32EncodedBytesIterator.remaining);
if (replacementCodepoint != null) {
return replacementCodepoint;
} else {
throw new ArgumentError(
"Invalid UTF32 at ${utf32EncodedBytesIterator.position}");
}
} else {
int codepoint = decode();
if (_validCodepoint(codepoint)) {
return codepoint;
} else if (replacementCodepoint != null) {
return replacementCodepoint;
} else {
throw new ArgumentError(
"Invalid UTF32 at ${utf32EncodedBytesIterator.position}");
}
}
}
void skip([int count = 1]) #
inherited from Utf32BytesDecoder
void skip([int count = 1]) {
utf32EncodedBytesIterator.skip(4 * count);
}