diff options
Diffstat (limited to 'examples/scala-js/library/src/main/scala/scala/scalajs/niocharset/UTF_16_Common.scala')
| -rw-r--r-- | examples/scala-js/library/src/main/scala/scala/scalajs/niocharset/UTF_16_Common.scala | 205 |
1 files changed, 0 insertions, 205 deletions
diff --git a/examples/scala-js/library/src/main/scala/scala/scalajs/niocharset/UTF_16_Common.scala b/examples/scala-js/library/src/main/scala/scala/scalajs/niocharset/UTF_16_Common.scala deleted file mode 100644 index 3330d9c..0000000 --- a/examples/scala-js/library/src/main/scala/scala/scalajs/niocharset/UTF_16_Common.scala +++ /dev/null @@ -1,205 +0,0 @@ -/* __ *\ -** ________ ___ / / ___ __ ____ Scala.js API ** -** / __/ __// _ | / / / _ | __ / // __/ (c) 2013, LAMP/EPFL ** -** __\ \/ /__/ __ |/ /__/ __ |/_// /_\ \ http://scala-lang.org/ ** -** /____/\___/_/ |_/____/_/ | |__/ /____/ ** -** |/____/ ** -\* */ - - -package scala.scalajs.niocharset - -import scala.annotation.tailrec - -import java.nio._ -import java.nio.charset._ - -/** This is a very specific common implementation for UTF_16BE and UTF_16LE. - */ -private[niocharset] abstract class UTF_16_Common protected ( - name: String, aliases: Array[String], - private val endianness: Int) extends Charset(name, aliases) { - - import UTF_16_Common._ - - def contains(that: Charset): Boolean = true - - def newDecoder(): CharsetDecoder = new Decoder - def newEncoder(): CharsetEncoder = new Encoder - - private class Decoder extends CharsetDecoder( - UTF_16_Common.this, 0.5f, 1.0f) { - private var endianness = UTF_16_Common.this.endianness - - override protected def implReset(): Unit = { - super.implReset() - endianness = UTF_16_Common.this.endianness - } - - def decodeLoop(in: ByteBuffer, out: CharBuffer): CoderResult = { - @inline - @tailrec - def loop(): CoderResult = { - if (in.remaining < 2) CoderResult.UNDERFLOW - else { - val b1 = in.get() & 0xff - val b2 = in.get() & 0xff - - val wasBOM = if (endianness == AutoEndian) { - // Read BOM - if (b1 == 0xfe && b2 == 0xff) { - endianness = BigEndian - true - } else if (b1 == 0xff && b2 == 0xfe) { - endianness = LittleEndian - true - } else { - // Not a valid BOM: default to BigEndian and start reading - endianness = BigEndian - false - } - } else false - - if (wasBOM) { - loop() - } else { - val bigEndian = endianness == BigEndian - - @inline def bytes2char(hi: Int, lo: Int): Char = - (if (bigEndian) (hi << 8) | lo else (lo << 8) | hi).toChar - - val c1 = bytes2char(b1, b2) - - if (Character.isLowSurrogate(c1)) { - in.position(in.position - 2) - CoderResult.malformedForLength(2) - } else if (!Character.isHighSurrogate(c1)) { - if (out.remaining == 0) { - in.position(in.position - 2) - CoderResult.OVERFLOW - } else { - out.put(c1) - loop() - } - } else { - if (in.remaining < 2) { - in.position(in.position - 2) - CoderResult.UNDERFLOW - } else { - val b3 = in.get() & 0xff - val b4 = in.get() & 0xff - val c2 = bytes2char(b3, b4) - - if (!Character.isLowSurrogate(c2)) { - in.position(in.position - 4) - CoderResult.malformedForLength(2) - } else { - if (out.remaining < 2) { - in.position(in.position - 4) - CoderResult.OVERFLOW - } else { - out.put(c1) - out.put(c2) - loop() - } - } - } - } - } - } - } - - loop() - } - } - - private class Encoder extends CharsetEncoder( - UTF_16_Common.this, 2.0f, 2.0f, - // Character 0xfffd - if (endianness == LittleEndian) Array(-3, -1) else Array(-1, -3)) { - - private var needToWriteBOM: Boolean = endianness == AutoEndian - - override protected def implReset(): Unit = { - super.implReset() - needToWriteBOM = endianness == AutoEndian - } - - def encodeLoop(in: CharBuffer, out: ByteBuffer): CoderResult = { - if (needToWriteBOM) { - if (out.remaining < 2) { - return CoderResult.OVERFLOW - } else { - // Always encode in big endian - out.put(0xfe.toByte) - out.put(0xff.toByte) - needToWriteBOM = false - } - } - - val bigEndian = endianness != LittleEndian - - @inline - def putChar(c: Char): Unit = { - if (bigEndian) { - out.put((c >> 8).toByte) - out.put(c.toByte) - } else { - out.put(c.toByte) - out.put((c >> 8).toByte) - } - } - - @inline - @tailrec - def loop(): CoderResult = { - if (in.remaining == 0) CoderResult.UNDERFLOW - else { - val c1 = in.get() - - if (Character.isLowSurrogate(c1)) { - in.position(in.position - 1) - CoderResult.malformedForLength(1) - } else if (!Character.isHighSurrogate(c1)) { - if (out.remaining < 2) { - in.position(in.position - 1) - CoderResult.OVERFLOW - } else { - putChar(c1) - loop() - } - } else { - if (in.remaining < 1) { - in.position(in.position - 1) - CoderResult.UNDERFLOW - } else { - val c2 = in.get() - - if (!Character.isLowSurrogate(c2)) { - in.position(in.position - 2) - CoderResult.malformedForLength(1) - } else { - if (out.remaining < 4) { - in.position(in.position - 2) - CoderResult.OVERFLOW - } else { - putChar(c1) - putChar(c2) - loop() - } - } - } - } - } - } - - loop() - } - } -} - -private[niocharset] object UTF_16_Common { - final val AutoEndian = 0 - final val BigEndian = 1 - final val LittleEndian = 2 -} |