First draft of storage APIs (#122)

* First draft of storage APIs

* bumped pxt-core

* using fixed instances to seprate temp from permanent

* send console to storage

* sim support

* missing sim stubs

* adding storage blocks

* more sim support

* remove storage from default package

* fix rendering of ms

* render raw ms

* slize at better place

* duplicate bundled dir

* refactor limit

* simplify limit logic

sim/state/control.ts

@@ -8,6 +8,7 @@ namespace pxsim.MMapMethods {
         read?: (d: Buffer) => number;
         write?: (d: Buffer) => number;
         ioctl?: (id: number, d: Buffer) => number;
+        lseek?: (offset: number, whence: number) => number;
     }
 
     import BM = pxsim.BufferMethods
@@ -23,6 +24,7 @@ namespace pxsim.MMapMethods {
             if (!impl.read) impl.read = () => 0
             if (!impl.write) impl.write = () => 0
             if (!impl.ioctl) impl.ioctl = () => -1
+            if (!impl.lseek) impl.lseek = (offset, whence) => -1
         }
         destroy() {
         }
@@ -68,6 +70,10 @@ namespace pxsim.MMapMethods {
     export function read(m: MMap, data: Buffer): number {
         return m.impl.read(data)
     }
+
+    export function lseek(m: MMap, offset: number, whence: number): number {
+        return m.impl.lseek(offset, whence);
+    }
 }
 
 namespace pxsim.control {

sim/state/storage.ts

@@ -0,0 +1,23 @@
+namespace pxsim.storage {
+    export function __stringToBuffer(s: string): RefBuffer {
+        // TODO
+        return new RefBuffer(new Uint8Array([]));
+    }
+
+    export function __bufferToString(b: RefBuffer): string {
+        // TODO
+        return "";
+    }
+
+    export function __mkdir(fn: string) {
+        // TODO
+    }
+
+    export function __unlink(filename: string): void { 
+        // TODO
+    }
+
+    export function __truncate(filename: string): void { 
+        // TODO
+    }
+}