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/* __ *\
** ________ ___ / / ___ Scala API **
** / __/ __// _ | / / / _ | (c) 2002-2009, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ | http://scala-lang.org/ **
** /____/\___/_/ |_/____/_/ | | **
** |/ **
\* */
// $Id$
package scala.tools.util
/** This object provides methods for encoding/decoding UTF-8 characters.
*
* @author Martin Odersky
* @version 1.0
*/
object UTF8Codec {
def encode(src: Array[Char], from: Int, dst: Array[Byte], to: Int, len: Int): Int = {
var i = from
var j = to
val end = from + len
while (i < end) {
val ch = src(i)
i += 1
if (ch < 128) {
dst(j) = ch.toByte
j += 1
}
else if (ch <= 0x3FF) {
dst(j) = (0xC0 | (ch >> 6)).toByte
dst(j+1) = (0x80 | (ch & 0x3F)).toByte
j += 2
} else {
dst(j) = (0xE0 | (ch >> 12)).toByte
dst(j+1) = (0x80 | ((ch >> 6) & 0x3F)).toByte
dst(j+2) = (0x80 | (ch & 0x3F)).toByte
j += 3
}
}
j
}
def encode(s: String, dst: Array[Byte], to: Int): Int =
encode(s.toCharArray(), 0, dst, to, s.length())
def encode(s: String): Array[Byte] = {
val dst = new Array[Byte](s.length() * 3)
val len = encode(s, dst, 0)
dst.subArray(0, len)
}
def decode(src: Array[Byte], from: Int,
dst: Array[Char], to: Int, len: Int): Int =
{
var i = from
var j = to
val end = from + len
while (i < end) {
var b = src(i) & 0xFF
i += 1
if (b >= 0xE0) {
b = ((b & 0x0F) << 12) | (src(i) & 0x3F) << 6
b = b | (src(i+1) & 0x3F)
i += 2
} else if (b >= 0xC0) {
b = ((b & 0x1F) << 6) | (src(i) & 0x3F)
i += 1
}
dst(j) = b.toChar
j += 1
}
j
}
def decode(src: Array[Byte], from: Int, len: Int): String = {
val cs = new Array[Char](len)
new String(cs, 0, decode(src, 0, cs, 0, len))
}
}
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