Fix mac/git renaming case failure. Aaarrrrgggghhhh.

utils/string_encoding/Utf16.dart

-// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-#library("utf16");
-#import("unicode_core.dart");
-#import("unicode.dart");
-
-/**
- * Produce a String from a sequence of UTF-16 encoded bytes. The parameters
- * allow an offset into a list of bytes (as int), limiting the length of the
- * values be decoded and the ability of override the default Unicode
- * replacement character. Set the replacementCharacter to null to throw an
- * IllegalArgumentException rather than replace the bad value.
- */
-String decodeFromUtf16(List<int> bytes, [int offset = 0, int length,
-    int replacementCodepoint = UNICODE_REPLACEMENT_CHARACTER_CODEPOINT]) {
-  List<int> codeUnits =
-      _utf16ToUtf16CodeUnits(bytes, offset, length);
-  // TODO is16BitCodeUnit() is used to work around a bug with frog/dartc
-  // (http://code.google.com/p/dart/issues/detail?id=1357). Consider
-  // removing after this issue is resolved.
-  if (is16BitCodeUnit()) {
-    return new String.fromCharCodes(codeUnits);
-  } else {
-    return new String.fromCharCodes(
-        utf16CodeUnitsToCodepoints(codeUnits, 0, null, replacementCodepoint));
-  }
-}
-
-/**
- * Produce a String from a sequence of UTF-16BE encoded bytes. The parameters
- * allow an offset into a list of bytes (as int), limiting the length of the
- * values be decoded and the ability of override the default Unicode
- * replacement character. Set the replacementCharacter to null to throw an
- * IllegalArgumentException rather than replace the bad value.
- */
-String decodeFromUtf16be(List<int> bytes, [int offset = 0, int length,
-    bool stripBom = true,
-    int replacementCodepoint = UNICODE_REPLACEMENT_CHARACTER_CODEPOINT]) {
-  List<int> codeUnits =
-      _utf16beToUtf16CodeUnits(bytes, offset, length, stripBom);
-  // TODO is16BitCodeUnit() is used to work around a bug with frog/dartc
-  // (http://code.google.com/p/dart/issues/detail?id=1357). Consider
-  // removing after this issue is resolved.
-  if (is16BitCodeUnit()) {
-    return new String.fromCharCodes(codeUnits);
-  } else {
-    return new String.fromCharCodes(
-        utf16CodeUnitsToCodepoints(codeUnits, 0, null, replacementCodepoint));
-  }
-}
-
-/**
- * Produce a String from a sequence of UTF-16LE encoded bytes. The parameters
- * allow an offset into a list of bytes (as int), limiting the length of the
- * values be decoded and the ability of override the default Unicode
- * replacement character. Set the replacementCharacter to null to throw an
- * IllegalArgumentException rather than replace the bad value.
- */
-String decodeFromUtf16le(List<int> bytes, [int offset = 0, int length,
-    bool stripBom = true,
-    int replacementCodepoint = UNICODE_REPLACEMENT_CHARACTER_CODEPOINT]) {
-  List<int> codeUnits =
-      _utf16leToUtf16CodeUnits(bytes, offset, length, stripBom);
-  // TODO is16BitCodeUnit() is used to work around a bug with frog/dartc
-  // (http://code.google.com/p/dart/issues/detail?id=1357). Consider
-  // removing after this issue is resolved.
-  if (is16BitCodeUnit()) {
-    return new String.fromCharCodes(codeUnits);
-  } else {
-    return new String.fromCharCodes(
-        utf16CodeUnitsToCodepoints(codeUnits, 0, null, replacementCodepoint));
-  }
-}
-
-/**
- * Produce a sequence of UTF-16 encoded bytes.
- */
-List<int> encodeAsUtf16(String str) =>
-    encodeAsUtf16be(str, true);
-
-/**
- * Produce a sequence of UTF-16BE encoded bytes.
- */
-List<int> encodeAsUtf16be(String str, [bool writeBOM = false]) {
-  List<int> utf16CodeUnits = _stringToUtf16CodeUnits(str);
-  List<int> encoding =
-      new List<int>(2 * utf16CodeUnits.length + (writeBOM ? 2 : 0));
-  int i = 0;
-  if (writeBOM) {
-    encoding[i++] = UNICODE_UTF_BOM_HI;
-    encoding[i++] = UNICODE_UTF_BOM_LO;
-  }
-  for (int unit in utf16CodeUnits) {
-    encoding[i++] = (unit & UNICODE_BYTE_ONE_MASK) >> 8;
-    encoding[i++] = unit & UNICODE_BYTE_ZERO_MASK;
-  }
-  return encoding;
-}
-
-/**
- * Produce a sequence of UTF-16LE encoded bytes.
- */
-List<int> encodeAsUtf16le(String str, [bool writeBOM = false]) {
-  List<int> utf16CodeUnits = _stringToUtf16CodeUnits(str);
-  List<int> encoding =
-      new List<int>(2 * utf16CodeUnits.length + (writeBOM ? 2 : 0));
-  int i = 0;
-  if (writeBOM) {
-    encoding[i++] = UNICODE_UTF_BOM_LO;
-    encoding[i++] = UNICODE_UTF_BOM_HI;
-  }
-  for (int unit in utf16CodeUnits) {
-    encoding[i++] = unit & UNICODE_BYTE_ZERO_MASK;
-    encoding[i++] = (unit & UNICODE_BYTE_ONE_MASK) >> 8;
-  }
-  return encoding;
-}
-
-bool hasUtf16Bom(List<int> utf32EncodedBytes, [int offset = 0, int length]) {
-  return hasUtf16beBom(utf32EncodedBytes, offset, length) ||
-      hasUtf16leBom(utf32EncodedBytes, offset, length);
-}
-
-bool hasUtf16beBom(List<int> utf16EncodedBytes, [int offset = 0, int length]) {
-  if (!(offset >= 0)) {
-    throw new IllegalArgumentException("offset");
-  }
-
-  if (!(length == null || length >= 0)) {
-    throw new IllegalArgumentException("length");
-  }
-
-  int end = length != null ?
-      Math.min(utf16EncodedBytes.length, offset + length) :
-      utf16EncodedBytes.length;
-
-  return (offset + 2) <= end &&
-      utf16EncodedBytes[offset] == UNICODE_UTF_BOM_HI &&
-      utf16EncodedBytes[offset + 1] == UNICODE_UTF_BOM_LO;
-}
-
-bool hasUtf16leBom(List<int> utf16EncodedBytes, [int offset = 0, int length]) {
-  if (!(offset >= 0)) {
-    throw new IllegalArgumentException("offset");
-  }
-
-  if (!(length == null || length >= 0)) {
-    throw new IllegalArgumentException("length");
-  }
-
-  int end = length != null ?
-      Math.min(utf16EncodedBytes.length, offset + length) :
-      utf16EncodedBytes.length;
-
-  return (offset + 2) <= end &&
-      utf16EncodedBytes[offset] == UNICODE_UTF_BOM_LO &&
-      utf16EncodedBytes[offset + 1] == UNICODE_UTF_BOM_HI;
-}
-
-int _sizeCodeUnits(int utf16CodeUnitsLength) {
-  int v = ((utf16CodeUnitsLength)/2).floor().toInt();
-  return v;
-}
-
-List<int> _stringToUtf16CodeUnits(String str) {
-  // TODO is16BitCodeUnit() is used to work around a bug with frog/dartc
-  // (http://code.google.com/p/dart/issues/detail?id=1357). Consider
-  // removing after this issue is resolved.
-  if (is16BitCodeUnit()) {
-    return str.charCodes();
-  } else {
-    return codepointsToUtf16CodeUnits(str.charCodes());
-  }
-}
-
-/**
- * Convert UTF-16BE encoded bytes to utf16 code units by grouping 1-2 bytes
- * to produce the code unit (0-(2^16)-1).
- */
-List<int> _utf16beToUtf16CodeUnits(
-    List<int> utf16beEncodedBytes, [int offset = 0, int length,
-    bool stripBom = true]) {
-  if (!(offset >= 0)) {
-    throw new IllegalArgumentException("offset");
-  }
-
-  if (!(length == null || length >= 0)) {
-    throw new IllegalArgumentException("length");
-  }
-
-  int end = length != null ?
-      Math.min(utf16beEncodedBytes.length, offset + length) :
-      utf16beEncodedBytes.length;
-
-  int i = (stripBom && hasUtf16beBom(utf16beEncodedBytes, offset, length)) ?
-      offset + 2 : offset;
-  List<int> codeUnits =
-      new List<int>(_sizeCodeUnits(end - i));
-  int lastIndex = end - 1;
-  int j = 0;
-  while (i < lastIndex) {
-    int hi = utf16beEncodedBytes[i++];
-    int lo = utf16beEncodedBytes[i++];
-    codeUnits[j++] = (hi << 8) | lo;
-  }
-  return codeUnits;
-}
-
-/**
- * Convert UTF-16LE encoded bytes to utf16 code units by grouping 1-2 bytes
- * to produce the code unit (0-(2^16)-1).
- */
-List<int> _utf16leToUtf16CodeUnits(
-    List<int> utf16leEncodedBytes, [int offset = 0, int length,
-    bool stripBom = true]) {
-  if (!(offset >= 0)) {
-    throw new IllegalArgumentException("offset");
-  }
-
-  if (!(length == null || length >= 0)) {
-    throw new IllegalArgumentException("length");
-  }
-
-  int end = length != null ?
-      Math.min(utf16leEncodedBytes.length, offset + length) :
-      utf16leEncodedBytes.length;
-
-  int i = (stripBom && hasUtf16leBom(utf16leEncodedBytes, offset, length)) ?
-      offset + 2 : offset;
-  List<int> codeUnits =
-      new List<int>(_sizeCodeUnits(end - i));
-  int lastIndex = end - 1;
-  int j = 0;
-  while (i < lastIndex) {
-    int lo = utf16leEncodedBytes[i++];
-    int hi = utf16leEncodedBytes[i++];
-    codeUnits[j] = (hi << 8) | lo;
-  }
-  return codeUnits;
-}
-
-/**
- * Convert UTF-16 encoded bytes to utf16 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.
- */
-List<int> _utf16ToUtf16CodeUnits(
-    List<int> utf16EncodedBytes, [int offset = 0, int length]) {
-  if (!(offset >= 0)) {
-    throw new IllegalArgumentException("offset");
-  }
-
-  if (!(length == null || length >= 0)) {
-    throw new IllegalArgumentException("length");
-  }
-
-  int end = length != null ?
-      Math.min(utf16EncodedBytes.length, offset + length) :
-      utf16EncodedBytes.length;
-
-  if (hasUtf16beBom(utf16EncodedBytes, offset, length)) {
-    return _utf16beToUtf16CodeUnits(utf16EncodedBytes, offset + 2,
-        end - (offset + 2), false);
-  } else if (hasUtf16leBom(utf16EncodedBytes, offset, length)) {
-    return _utf16leToUtf16CodeUnits(utf16EncodedBytes, offset + 2,
-        end - (offset + 2), false);
-  } else {
-    return _utf16beToUtf16CodeUnits(
-        utf16EncodedBytes, offset, end - offset, false);
-  }
-}