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compressionplatform.scala
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/
compressionplatform.scala
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/*
* Copyright (c) 2013 Functional Streams for Scala
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
* the Software, and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
package fs2
package io
import cats.effect.kernel.Async
import cats.syntax.all._
import fs2.compression.Compression
import fs2.compression.DeflateParams
import fs2.compression.GunzipResult
import fs2.compression.InflateParams
import fs2.compression.ZLibParams
import fs2.io.internal.facade
private[io] trait compressionplatform {
class ZipException(msg: String) extends IOException(msg)
implicit def fs2ioCompressionForAsync[F[_]](implicit F: Async[F]): Compression[F] =
new Compression.UnsealedCompression[F] {
def deflate(deflateParams: DeflateParams): Pipe[F, Byte, Byte] =
deflateImpl(deflateParams) { options =>
deflateParams.header match {
case ZLibParams.Header.GZIP => facade.zlib.createDeflateRaw(options)
case ZLibParams.Header.ZLIB => facade.zlib.createDeflate(options)
}
}
def inflate(inflateParams: InflateParams): Pipe[F, Byte, Byte] =
inflateImpl(inflateParams) { options =>
inflateParams.header match {
case ZLibParams.Header.GZIP => facade.zlib.createInflateRaw(options)
case ZLibParams.Header.ZLIB => facade.zlib.createInflate(options)
}
}
def gzip(
fileName: Option[Nothing],
modificationTime: Option[Nothing],
comment: Option[Nothing],
deflateParams: DeflateParams
): Pipe[F, Byte, Byte] = deflateImpl(deflateParams) { options =>
require(!deflateParams.fhCrcEnabled, "FHCRC is not supported on Node.js")
deflateParams.header match {
case ZLibParams.Header.GZIP => facade.zlib.createGzip(options)
case ZLibParams.Header.ZLIB =>
throw new ZipException(
s"${ZLibParams.Header.GZIP} header type required, not ${deflateParams.header}."
)
}
}
def gunzip(inflateParams: InflateParams): Stream[F, Byte] => Stream[F, GunzipResult[F]] =
in => {
val content = inflateImpl(inflateParams) { options =>
inflateParams.header match {
case ZLibParams.Header.GZIP => facade.zlib.createGunzip(options)
case ZLibParams.Header.ZLIB =>
throw new ZipException(
s"${ZLibParams.Header.GZIP} header type required, not ${inflateParams.header}."
)
}
}
Stream.emit(GunzipResult(content(in)))
}
def deflateImpl(
deflateParams: DeflateParams
)(f: facade.zlib.Options => facade.zlib.Zlib): Pipe[F, Byte, Byte] = in => {
val options = new facade.zlib.Options {
chunkSize = deflateParams.bufferSizeOrMinimum
level = deflateParams.level.juzDeflaterLevel
strategy = deflateParams.strategy.juzDeflaterStrategy
flush = deflateParams.flushMode.juzDeflaterFlushMode
}
Stream
.resource(suspendReadableAndRead()(f(options)))
.flatMap { case (deflate, out) =>
out
.concurrently(in.through(writeWritable[F](deflate.pure.widen)))
.onFinalize(
F.async_[Unit](cb => deflate.close(() => cb(Right(()))))
)
}
}
def inflateImpl(
inflateParams: InflateParams
)(f: facade.zlib.Options => facade.zlib.Zlib): Pipe[F, Byte, Byte] = in => {
val options = new facade.zlib.Options {
chunkSize = inflateParams.bufferSizeOrMinimum
}
Stream
.resource(suspendReadableAndRead()(f(options)))
.flatMap { case (inflate, out) =>
out
.concurrently(in.through(writeWritable[F](inflate.pure.widen)))
.onFinalize(
F.async_[Unit](cb => inflate.close(() => cb(Right(()))))
)
}
}
}
}