cross-platforming compression

build.sbt

@@ -158,7 +158,10 @@ ThisBuild / mimaBinaryIssueFilters ++= Seq(
   ProblemFilters.exclude[DirectMissingMethodProblem](
     "fs2.compression.Compression.gunzip$default$1$"
   ),
-  ProblemFilters.exclude[DirectMissingMethodProblem]("fs2.ChunkCompanionPlatform.makeArrayBuilder")
+  ProblemFilters.exclude[DirectMissingMethodProblem]("fs2.ChunkCompanionPlatform.makeArrayBuilder"),
+  ProblemFilters.exclude[ReversedMissingMethodProblem](
+    "fs2.compression.Compression.gzip"
+  ) // Compression is a sealed trait with an implementation
 )
 
 lazy val root = tlCrossRootProject

core/js/src/main/scala/fs2/compression/ZipException.scala

@@ -0,0 +1,26 @@
+/*
+ * 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.compression
+
+import java.io.IOException
+
+class ZipException(message: String, cause: Throwable = null) extends IOException(message, cause)

core/js/src/main/scala/fs2/compression/internal/CrcBuilder.scala

@@ -0,0 +1,46 @@
+/*
+ * 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.compression.internal
+
+import fs2.Chunk
+
+private[fs2] class CrcBuilder {
+
+  private val crc = new CRC32
+
+  def update(b: Int): Unit =
+    crc.update(b)
+
+  def update(b: Array[Byte], off: Int, len: Int): Unit =
+    crc.update(b, off, len)
+
+  def update(c: Chunk[Byte]): Unit = {
+    val arr = c.toArraySlice
+    update(arr.values, arr.offset, arr.length)
+  }
+
+  def update(b: Array[Byte]): Unit =
+    crc.update(b)
+
+  def getValue: Long = crc.getValue()
+
+}