factory functions for file systems based on cc mounts (totally untested)

li/cil/oc/api/FileSystem.scala

@@ -1,5 +1,6 @@
 package li.cil.oc.api
 
+import dan200.computer.api.{IWritableMount, IMount}
 import li.cil.oc.api.detail.FileSystemAPI
 import li.cil.oc.api.fs.{Mode, Handle}
 import li.cil.oc.api.network.Node
@@ -301,8 +302,8 @@ object FileSystem extends FileSystemAPI {
    * @param buffered whether data should only be written to disk when saving.
    * @return a file system wrapping the specified folder.
    */
-  def fromSaveDir(root: String, capacity: Long, buffered: Boolean = true) =
-    instance.fold(None: Option[FileSystem])(_.fromSaveDir(root, capacity, buffered))
+  def fromSaveDirectory(root: String, capacity: Long, buffered: Boolean = true) =
+    instance.fold(None: Option[FileSystem])(_.fromSaveDirectory(root, capacity, buffered))
 
   /**
    * Creates a new *writable* file system that resides in memory.
@@ -315,8 +316,26 @@ object FileSystem extends FileSystemAPI {
    * @param capacity the capacity of the file system.
    * @return a file system residing in memory.
    */
-  def fromRam(capacity: Long): Option[FileSystem] =
-    instance.fold(None: Option[FileSystem])(_.fromRam(capacity))
+  def fromMemory(capacity: Long): Option[FileSystem] =
+    instance.fold(None: Option[FileSystem])(_.fromMemory(capacity))
+
+  /**
+   * Creates a new file system based on a read-only ComputerCraft mount.
+   *
+   * @param mount the mount to wrap with a file system.
+   * @return a file system wrapping the specified mount.
+   */
+  def fromComputerCraft(mount: IMount): Option[FileSystem] =
+    instance.fold(None: Option[FileSystem])(_.fromComputerCraft(mount))
+
+  /**
+   * Creates a new file system based on a read-write ComputerCraft mount.
+   *
+   * @param mount the mount to wrap with a file system.
+   * @return a file system wrapping the specified mount.
+   */
+  def fromComputerCraft(mount: IWritableMount): Option[FileSystem] =
+    instance.fold(None: Option[FileSystem])(_.fromComputerCraft(mount))
 
   /**
    * Creates a network node that makes the specified file system available via

li/cil/oc/api/detail/FileSystemAPI.scala

@@ -2,14 +2,19 @@ package li.cil.oc.api.detail
 
 import li.cil.oc.api.FileSystem
 import li.cil.oc.api.network.Node
+import dan200.computer.api.{IMount, IWritableMount}
 
 /** Avoids reflection structural types would induce. */
 trait FileSystemAPI {
   def fromClass(clazz: Class[_], domain: String, root: String): Option[FileSystem]
 
-  def fromSaveDir(root: String, capacity: Long, buffered: Boolean): Option[FileSystem]
+  def fromSaveDirectory(root: String, capacity: Long, buffered: Boolean): Option[FileSystem]
 
-  def fromRam(capacity: Long): Option[FileSystem]
+  def fromMemory(capacity: Long): Option[FileSystem]
+
+  def fromComputerCraft(mount: IMount): Option[FileSystem]
+
+  def fromComputerCraft(mount: IWritableMount): Option[FileSystem]
 
   def asNode(fs: FileSystem): Option[Node]
 }

li/cil/oc/server/component/Computer.scala

@@ -69,7 +69,7 @@ class Computer(val owner: Computer.Environment) extends Persistable with Runnabl
     flatMap(api.FileSystem.asNode)
 
   private val tmp = api.FileSystem.
-    fromRam(512 * 1024).
+    fromMemory(512 * 1024).
     flatMap(api.FileSystem.asNode)
 
   // ----------------------------------------------------------------------- //

li/cil/oc/server/driver/FileSystem.scala

@@ -22,7 +22,7 @@ object FileSystem extends Item {
       val address =
         if (tag.hasKey("address")) tag.getString("address")
         else java.util.UUID.randomUUID().toString
-      oc.api.FileSystem.fromSaveDir(address, subItem.megaBytes * 1024 * 1024, Config.filesBuffered).
+      oc.api.FileSystem.fromSaveDirectory(address, subItem.megaBytes * 1024 * 1024, Config.filesBuffered).
         flatMap(oc.api.FileSystem.asNode) match {
         case None => None
         case Some(node) =>

li/cil/oc/server/fs/ComputerCraftFileSystem.scala

@@ -0,0 +1,23 @@
+package li.cil.oc.server.fs
+
+import dan200.computer.api.IMount
+
+class ComputerCraftFileSystem(val mount: IMount) extends InputStreamFileSystem {
+  override def exists(path: String) = mount.exists(path)
+
+  override def isDirectory(path: String) = mount.isDirectory(path)
+
+  override def list(path: String) = {
+    val result = new java.util.ArrayList[String]
+    mount.list(path, result)
+    Some(result.toArray.asInstanceOf[Array[String]])
+  }
+
+  override def size(path: String) = mount.getSize(path)
+
+  protected def openInputStream(path: String) = try {
+    Some(mount.openForRead(path))
+  } catch {
+    case _: Throwable => None
+  }
+}

li/cil/oc/server/fs/ComputerCraftWritableFileSystem.scala

@@ -0,0 +1,32 @@
+package li.cil.oc.server.fs
+
+import dan200.computer.api.IWritableMount
+import li.cil.oc.api.fs.Mode
+
+class ComputerCraftWritableFileSystem(override val mount: IWritableMount)
+  extends ComputerCraftFileSystem(mount)
+  with OutputStreamFileSystem {
+
+  override protected def makeDirectory(path: String) = try {
+    mount.makeDirectory(path)
+    true
+  } catch {
+    case _: Throwable => false
+  }
+
+  override protected def delete(path: String) = try {
+    mount.delete(path)
+    true
+  } catch {
+    case _: Throwable => false
+  }
+
+  override protected def openOutputStream(path: String, mode: Mode.Value) = try {
+    Some(mode match {
+      case Mode.Append => mount.openForAppend(path)
+      case Mode.Write => mount.openForWrite(path)
+    })
+  } catch {
+    case _: Throwable => None
+  }
+}

li/cil/oc/server/fs/FileSystem.scala

@@ -1,5 +1,6 @@
 package li.cil.oc.server.fs
 
+import dan200.computer.api.{IWritableMount, IMount}
 import java.io
 import java.util.zip.ZipFile
 import li.cil.oc.server.component
@@ -38,7 +39,7 @@ object FileSystem extends api.detail.FileSystemAPI {
     }
   }
 
-  override def fromSaveDir(root: String, capacity: Long, buffered: Boolean) = {
+  override def fromSaveDirectory(root: String, capacity: Long, buffered: Boolean) = {
     val path = new io.File(DimensionManager.getCurrentSaveRootDirectory, Config.savePath + root)
     path.mkdirs()
     if (path.exists() && path.isDirectory) {
@@ -50,7 +51,11 @@ object FileSystem extends api.detail.FileSystemAPI {
     else None
   }
 
-  override def fromRam(capacity: Long): Option[api.FileSystem] = Some(new RamFileSystem(capacity))
+  override def fromMemory(capacity: Long): Option[api.FileSystem] = Some(new RamFileSystem(capacity))
+
+  def fromComputerCraft(mount: IMount) = Some(new ComputerCraftFileSystem(mount))
+
+  def fromComputerCraft(mount: IWritableMount) = Some(new ComputerCraftWritableFileSystem(mount))
 
   override def asNode(fileSystem: api.FileSystem) = Some(new component.FileSystem(fileSystem))
 

li/cil/oc/server/fs/VirtualFileSystem.scala

@@ -5,7 +5,7 @@ import li.cil.oc.api.fs.Mode
 import net.minecraft.nbt.{NBTTagList, NBTTagCompound}
 import scala.collection.mutable
 
-class VirtualFileSystem extends OutputStreamFileSystem {
+trait VirtualFileSystem extends OutputStreamFileSystem {
   private val root = new VirtualDirectory
 
   // ----------------------------------------------------------------------- //