Add RBLKS, WBLKS field to channel.

src/channel.js

@@ -44,19 +44,26 @@ export class Channel {
    * 2.Read Position
    *
    * Figure:
-   *  ----------------------------------------------------------------------------------------------------------------
-   * | ReadPointer (4 bytes) | WritePointer (4 Bytes) | Private (4 Bytes) | WBlocks (2 Bytes) | RBlocks (2 Bytes) | Data Area (N bytes)  |
-   * ----------------------------------------------------------------------------------------------------------------
+   *  -------------------------------------------------------------------------------------------------------------------------------
+   * | ReadPointer (4 bytes) | WritePointer (4 Bytes) | RBlks (1 Byte) | WBlks (1 Bytes) | Private (2 Bytes) | Data Area (N bytes)  |
+   * -------------------------------------------------------------------------------------------------------------------------------
    *
    * where N >= 2
    *
    * */
   #rFieldPosLen   = 4;
   #wFieldPosLen   = 4;
-  #priFieldLen    = 4;
-  #numOfMetaField = 3;
+  #rBlkFieldLen   = 1;
+  #wBlkFieldLen   = 1;
+  #priFieldLen    = 2;
   #fieldSize      = 0;
 
+  #rPtrShift      = 0;
+  #wPtrShift      = this.#rPtrShift + this.#rFieldPosLen;
+  #rBlkShift      = this.#wPtrShift + this.#wFieldPosLen;
+  #wBlkShift      = this.#rBlkShift + this.#rBlkFieldLen;
+  #priShift       = this.#wBlkShift + this.#wBlkFieldLen;
+
   #metaSize  = 0;
   #size      = 0;
   #totalSize = 0;
@@ -86,7 +93,8 @@ export class Channel {
     this.#size = size+1;
 
     // Init shared memory
-    this.#metaSize      = this.#rFieldPosLen + this.#wFieldPosLen + this.#priFieldLen;
+    this.#metaSize      = this.#rFieldPosLen + this.#wFieldPosLen +
+      this.#rBlkFieldLen + this.#wBlkFieldLen + this.#priFieldLen;
 
     this.#shMem = shMem == null ? new bufferType(this.#size + this.#metaSize) : shMem;
     this.#view          = new DataView(this.#shMem);
@@ -97,8 +105,8 @@ export class Channel {
 
     // Init readPointer and writePointer to
     // the first bytes of data area.
-    this.#view.setUint32(0, this.#writePointerCache);
-    this.#view.setUint32(4, this.#readPointerCache);
+    this.#view.setUint32(this.#wPtrShift, this.#writePointerCache);
+    this.#view.setUint32(this.#rPtrShift, this.#readPointerCache);
 
     this.#totalSize     = this.#metaSize + this.#size;
     this.#endPos        = this.#metaSize + this.#size;
@@ -107,11 +115,11 @@ export class Channel {
   }
 
   #getReadPointer() {
-    return this.#view.getUint32(0);
+    return this.#view.getUint32(this.#rPtrShift);
   }
 
   #getWritePointer() {
-    return this.#view.getUint32(4);
+    return this.#view.getUint32(this.#wPtrShift);
   }
 
   metaSize() {
@@ -119,12 +127,12 @@ export class Channel {
   }
 
   readPriv() {
-    return this.#view.getUint32(8);
+    return this.#view.getUint16(this.#priShift);
   }
 
   writePriv(privData) {
     try {
-      this.#view.setUint32(8, privData);
+      this.#view.setUint16(this.#priShift, privData);
     } catch (error) {
       if (error instanceof RangeError)
         return false;
@@ -153,6 +161,22 @@ export class Channel {
     this.#mode = CHANNEL_MODE.BYTE;
   }
 
+  getRBlks() {
+    return this.#view.getUint8(this.#rBlkShift);
+  }
+
+  setRBlks(num) {
+    this.#view.setUint8(this.#rBlkShift, num);
+  }
+
+  getWBlks() {
+    return this.#view.getUint8(this.#wBlkShift);
+  }
+
+  setWBlks(num) {
+    this.#view.setUint8(this.#wBlkShift, num);
+  }
+
   isSetPriv(flag) {
     let flags = this.readPriv();
     return flags & flag;
@@ -165,7 +189,7 @@ export class Channel {
 
   unsetPriv(flag) {
     let old = this.readPriv();
-    flag = flag ^ 0x11111111;
+    flag = flag ^ 0x1111;
     this.writePriv(flag & old);
   }
 
@@ -277,7 +301,6 @@ export class Channel {
     this.#writePointerCache = this.#getWritePointer();
     this.#readPointerCache = this.#getReadPointer();
 
-    console.log(this.#readPointerCache, this.#writePointerCache);
 
     if (!this.#isAbleToWrite(size)) {
       return [];
@@ -366,12 +389,12 @@ export class Channel {
 
   #writePointerUpdate(pos) {
     this.#writePointerCache = pos;
-    this.#view.setUint32(4, pos);
+    this.#view.setUint32(this.#wPtrShift, pos);
   }
 
   #readPointerUpdate(pos) {
     this.#readPointerCache = pos;
-    this.#view.setUint32(0, pos);
+    this.#view.setUint32(this.#rPtrShift, pos);
   }
 }