1 files changed, 53 insertions, 0 deletions
diff --git a/javalib/src/main/scala/java/io/InputStream.scala b/javalib/src/main/scala/java/io/InputStream.scala
new file mode 100644
index 0000000..412d84b
--- /dev/null
+++ b/javalib/src/main/scala/java/io/InputStream.scala
@@ -0,0 +1,53 @@
+package java.io
+
+abstract class InputStream extends Closeable {
+  def read(): Int
+
+  def read(b: Array[Byte]): Int = read(b, 0, b.length)
+
+  def read(b: Array[Byte], off: Int, len: Int): Int = {
+    if (off < 0 || len < 0 || len > b.length - off)
+      throw new IndexOutOfBoundsException
+
+    if (len == 0) 0
+    else {
+      var bytesWritten = 0
+      var next = 0
+
+      while (bytesWritten < len && next != -1) {
+        next =
+          if (bytesWritten == 0) read()
+          else {
+            try read()
+            catch { case _: IOException => -1 }
+          }
+        if (next != -1) {
+          b(off + bytesWritten) = next.toByte
+          bytesWritten += 1
+        }
+      }
+
+      if (bytesWritten <= 0) -1
+      else bytesWritten
+    }
+  }
+
+  def skip(n: Long): Long = {
+    var skipped = 0
+    while (skipped < n && read() != -1)
+      skipped += 1
+    skipped
+  }
+
+  def available(): Int = 0
+
+  def close(): Unit = ()
+
+  def mark(readlimit: Int): Unit = ()
+
+  def reset(): Unit =
+    throw new IOException("Reset not supported")
+
+  def markSupported(): Boolean = false
+
+}