scodec.codecs.StringCodec.scala Maven / Gradle / Ivy

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/*
 * Copyright (c) 2013, Scodec
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its contributors
 *    may be used to endorse or promote products derived from this software without
 *    specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package scodec
package codecs

import java.nio.{ByteBuffer, CharBuffer}
import java.nio.charset.Charset
import java.nio.charset.{MalformedInputException, UnmappableCharacterException}

import scodec.bits.BitVector

private[codecs] final class StringCodec(charset: Charset) extends Codec[String]:

  override def sizeBound = SizeBound.unknown

  override def encode(str: String) =
    val encoder = charset.newEncoder.nn
    val buffer = CharBuffer.wrap(str).nn
    try Attempt.successful(BitVector(encoder.encode(buffer).nn))
    catch
      case (_: MalformedInputException | _: UnmappableCharacterException) =>
        Attempt.failure(
          Err(s"${charset.displayName} cannot encode character '${buffer.charAt(0)}'")
        )

  override def decode(buffer: BitVector) =
    val decoder = charset.newDecoder.nn
    try
      val asBuffer = ByteBuffer.wrap(buffer.toByteArray)
      Attempt.successful(DecodeResult(decoder.decode(asBuffer).toString, BitVector.empty))
    catch
      case (_: MalformedInputException | _: UnmappableCharacterException) =>
        Attempt.failure(
          Err(s"${charset.displayName} cannot decode string from '0x${buffer.toByteVector.toHex}'")
        )

  override def toString = charset.displayName.nn