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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.{ ByteArrayOutputStream, InputStream }
import java.util.zip.GZIPOutputStream

import io.gatling.commons.util.Io._

object GzipHelper {

  def gzip(string: String): Array[Byte] = gzip(string.getBytes)

  def gzip(bytes: Array[Byte]): Array[Byte] =
    gzip(new FastByteArrayInputStream(bytes))

  val GzipDefaultBufferSize = 512

  def gzip(in: InputStream, bufferSize: Int = GzipDefaultBufferSize): Array[Byte] =
    withCloseable(in) { is =>
      val out = new ByteArrayOutputStream(bufferSize)

      withCloseable(new GZIPOutputStream(out)) {
        in.copyTo(_, bufferSize)
      }

      out.toByteArray
    }
}