Utf16beBytesToCodeUnitsDecoder class
Convert UTF-16BE encoded bytes to utf16 code units by grouping 1-2 bytes to produce the code unit (0-(2^16)-1).
class Utf16beBytesToCodeUnitsDecoder extends Utf16BytesToCodeUnitsDecoder {
Utf16beBytesToCodeUnitsDecoder(List<int> utf16EncodedBytes, [
int offset = 0, int length, bool stripBom = true,
int replacementCodepoint = UNICODE_REPLACEMENT_CHARACTER_CODEPOINT]) :
super._fromListRangeIterator((new _ListRange(utf16EncodedBytes, offset,
length)).iterator(), replacementCodepoint) {
if (stripBom && hasUtf16beBom(utf16EncodedBytes, offset, length)) {
skip();
}
}
int decode() {
int hi = utf16EncodedBytesIterator.next();
int lo = utf16EncodedBytesIterator.next();
return (hi << 8) + lo;
}
}
Extends
Utf16BytesToCodeUnitsDecoder > Utf16beBytesToCodeUnitsDecoder
Constructors
new Utf16beBytesToCodeUnitsDecoder(List<int> utf16EncodedBytes, [int offset = 0, int length, bool stripBom = true, int replacementCodepoint = UNICODE_REPLACEMENT_CHARACTER_CODEPOINT]) #
Utf16beBytesToCodeUnitsDecoder(List<int> utf16EncodedBytes, [
int offset = 0, int length, bool stripBom = true,
int replacementCodepoint = UNICODE_REPLACEMENT_CHARACTER_CODEPOINT]) :
super._fromListRangeIterator((new _ListRange(utf16EncodedBytes, offset,
length)).iterator(), replacementCodepoint) {
if (stripBom && hasUtf16beBom(utf16EncodedBytes, offset, length)) {
skip();
}
}
Properties
final int position #
inherited from Utf16BytesToCodeUnitsDecoder
int get position => utf16EncodedBytesIterator.position ~/ 2;
final int remaining #
inherited from Utf16BytesToCodeUnitsDecoder
int get remaining => (utf16EncodedBytesIterator.remaining + 1) ~/ 2;
final int replacementCodepoint #
inherited from Utf16BytesToCodeUnitsDecoder
final int replacementCodepoint;
final _ListRangeIterator utf16EncodedBytesIterator #
inherited from Utf16BytesToCodeUnitsDecoder
final _ListRangeIterator utf16EncodedBytesIterator;
Methods
void backup([int by = 1]) #
inherited from Utf16BytesToCodeUnitsDecoder
void backup([int by = 1]) {
utf16EncodedBytesIterator.backup(2 * by);
}
int decode() #
int decode() {
int hi = utf16EncodedBytesIterator.next();
int lo = utf16EncodedBytesIterator.next();
return (hi << 8) + lo;
}
List<int> decodeRest() #
inherited from Utf16BytesToCodeUnitsDecoder
Provides a fast way to decode the rest of the source bytes in a single call. This method trades memory for improved speed in that it potentially over-allocates the List containing results.
List<int> decodeRest() {
List<int> codeunits = new List<int>(remaining);
int i = 0;
while (hasNext()) {
codeunits[i++] = next();
}
if (i == codeunits.length) {
return codeunits;
} else {
List<int> truncCodeunits = new List<int>(i);
truncCodeunits.setRange(0, i, codeunits);
return truncCodeunits;
}
}
bool hasNext() #
inherited from Utf16BytesToCodeUnitsDecoder
int next() #
inherited from Utf16BytesToCodeUnitsDecoder
Gets the next element in the iteration. Throws a
NoMoreElementsException if no element is left.
int next() {
if (utf16EncodedBytesIterator.remaining < 2) {
utf16EncodedBytesIterator.next();
if (replacementCodepoint != null) {
return replacementCodepoint;
} else {
throw new ArgumentError(
"Invalid UTF16 at ${utf16EncodedBytesIterator.position}");
}
} else {
return decode();
}
}
void skip([int count = 1]) #
inherited from Utf16BytesToCodeUnitsDecoder
void skip([int count = 1]) {
utf16EncodedBytesIterator.skip(2 * count);
}