io.gatling.commons.util.CompositeByteArrayInputStream.scala Maven / Gradle / Ivy

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/**
 * Copyright 2011-2016 GatlingCorp (http://gatling.io)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package io.gatling.commons.util

import java.io.InputStream

import io.gatling.commons.util.Collections._

class CompositeByteArrayInputStream(parts: Seq[Array[Byte]]) extends InputStream {

  private var currentPos = 0
  private var bytePos = -1
  private var active: Array[Byte] = parts(currentPos)
  private var _available = parts.sumBy(_.length)

  override val available: Int = _available

  override def read(): Int = {
    bytePos += 1

    if (bytePos >= active.length) {
      // No more bytes, so step to the next array
      currentPos += 1
      if (currentPos >= parts.size) {
        _available = 0
        return -1
      }

      bytePos = 0
      active = parts(currentPos)
    }

    _available -= 1
    active(bytePos) & 0xFF
  }
}