Utf16BytesToCodeUnitsDecoder Class
Convert UTF-16 encoded bytes to UTF-16 code units by grouping 1-2 bytes to produce the code unit (0-(2^16)-1). Relies on BOM to determine endian-ness, and defaults to BE.
Subclasses
Utf16beBytesToCodeUnitsDecoder, Utf16leBytesToCodeUnitsDecoder
Constructors
Code factory Utf16BytesToCodeUnitsDecoder(List<int> utf16EncodedBytes, [int offset = 0, int length, int replacementCodepoint = UNICODE_REPLACEMENT_CHARACTER_CODEPOINT]) #
factory Utf16BytesToCodeUnitsDecoder(List<int> utf16EncodedBytes, [ int offset = 0, int length, int replacementCodepoint = UNICODE_REPLACEMENT_CHARACTER_CODEPOINT]) { if (length == null) { length = utf16EncodedBytes.length - offset; } if (hasUtf16beBom(utf16EncodedBytes, offset, length)) { return new Utf16beBytesToCodeUnitsDecoder(utf16EncodedBytes, offset + 2, length - 2, false, replacementCodepoint); } else if (hasUtf16leBom(utf16EncodedBytes, offset, length)) { return new Utf16leBytesToCodeUnitsDecoder(utf16EncodedBytes, offset + 2, length - 2, false, replacementCodepoint); } else { return new Utf16beBytesToCodeUnitsDecoder(utf16EncodedBytes, offset, length, false, replacementCodepoint); } }
Code new Utf16BytesToCodeUnitsDecoder._fromListRangeIterator(_ListRangeIterator utf16EncodedBytesIterator, int replacementCodepoint) #
Utf16BytesToCodeUnitsDecoder._fromListRangeIterator( _ListRangeIterator this.utf16EncodedBytesIterator, int this.replacementCodepoint);
Methods
Code void backup([int by = 1]) #
void backup([int by = 1]) { utf16EncodedBytesIterator.backup(2 * by); }
Code List<int> decodeRest() #
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; } }
Code int next() #
int next() { if (utf16EncodedBytesIterator.remaining < 2) { utf16EncodedBytesIterator.next(); if (replacementCodepoint != null) { return replacementCodepoint; } else { throw new IllegalArgumentException( "Invalid UTF16 at ${utf16EncodedBytesIterator.position}"); } } else { return decode(); } }
Code void skip([int count = 1]) #
void skip([int count = 1]) { utf16EncodedBytesIterator.skip(2 * count); }
Fields
Code final _ListRangeIterator utf16EncodedBytesIterator #
final _ListRangeIterator utf16EncodedBytesIterator;