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/*******************************************************************************
 * Copyright (c) 2003, 2007 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.swt.browser;

import org.eclipse.swt.internal.C;
import org.eclipse.swt.internal.mozilla.*;

class InputStream {
  XPCOMObject inputStream;
  int refCount = 0;

  byte[] buffer;
  int index = 0;
  
InputStream (byte[] buffer) {
  this.buffer = buffer;
  index = 0;
  createCOMInterfaces ();
}

int AddRef () {
  refCount++;
  return refCount;
}

void createCOMInterfaces () {
  /* Create each of the interfaces that this object implements */
  inputStream = new XPCOMObject (new int[] {2, 0, 0, 0, 1, 3, 4, 1}) {
    public int /*long*/ method0 (int /*long*/[] args) {return QueryInterface (args[0], args[1]);}
    public int /*long*/ method1 (int /*long*/[] args) {return AddRef ();}
    public int /*long*/ method2 (int /*long*/[] args) {return Release ();}
    public int /*long*/ method3 (int /*long*/[] args) {return Close ();}
    public int /*long*/ method4 (int /*long*/[] args) {return Available (args[0]);}
    public int /*long*/ method5 (int /*long*/[] args) {return Read (args[0], (int)/*64*/args[1], args[2]);}
    public int /*long*/ method6 (int /*long*/[] args) {return ReadSegments (args[0], args[1], (int)/*64*/args[2], args[3]);}
    public int /*long*/ method7 (int /*long*/[] args) {return IsNonBlocking (args[0]);}
  };
}

void disposeCOMInterfaces () {
  if (inputStream != null) {
    inputStream.dispose ();
    inputStream = null;  
  }
}

int /*long*/ getAddress () {
  return inputStream.getAddress ();
}

int QueryInterface (int /*long*/ riid, int /*long*/ ppvObject) {
  if (riid == 0 || ppvObject == 0) return XPCOM.NS_ERROR_NO_INTERFACE;
  nsID guid = new nsID ();
  XPCOM.memmove (guid, riid, nsID.sizeof);
  
  if (guid.Equals (nsISupports.NS_ISUPPORTS_IID)) {
    XPCOM.memmove (ppvObject, new int /*long*/[] {inputStream.getAddress ()}, C.PTR_SIZEOF);
    AddRef ();
    return XPCOM.NS_OK;
  }
  if (guid.Equals (nsIInputStream.NS_IINPUTSTREAM_IID)) {
    XPCOM.memmove (ppvObject, new int /*long*/[] {inputStream.getAddress ()}, C.PTR_SIZEOF);
    AddRef ();
    return XPCOM.NS_OK;
  }  
  XPCOM.memmove (ppvObject, new int /*long*/[] {0}, C.PTR_SIZEOF);
  return XPCOM.NS_ERROR_NO_INTERFACE;
}
          
int Release () {
  refCount--;
  if (refCount == 0) disposeCOMInterfaces ();
  return refCount;
}
  
/* nsIInputStream implementation */

int Close () {
  buffer = null;
  index = 0;
  return XPCOM.NS_OK;
}

int Available (int /*long*/ _retval) {
  int available = buffer == null ? 0 : buffer.length - index;
  XPCOM.memmove (_retval, new int[] {available}, 4);
  return XPCOM.NS_OK;
}

int Read(int /*long*/ aBuf, int aCount, int /*long*/ _retval) {
  int max = Math.min (aCount, buffer == null ? 0 : buffer.length - index);
  if (max > 0) {
    byte[] src = new byte[max];
    System.arraycopy (buffer, index, src, 0, max);
    XPCOM.memmove (aBuf, src, max);
    index += max;
  }
  XPCOM.memmove(_retval, new int[] {max}, 4);
  return XPCOM.NS_OK;
}

int ReadSegments (int /*long*/ aWriter, int /*long*/ aClosure, int aCount, int /*long*/ _retval) {
  int max = Math.min (aCount, buffer == null ? 0 : buffer.length - index);
  int cnt = max;
  while (cnt > 0) {
    int[] aWriteCount = new int[1];
    int /*long*/ rc = XPCOM.Call (aWriter, getAddress (), aClosure, buffer, index, cnt, aWriteCount);
    if (rc != XPCOM.NS_OK) break;
    index += aWriteCount[0];
    cnt -= aWriteCount[0];
  }
  XPCOM.memmove (_retval, new int[] {max - cnt}, 4);
  return XPCOM.NS_OK;
}

int IsNonBlocking (int /*long*/ _retval) {
  /* blocking */
  XPCOM.memmove (_retval, new int[] {0}, 4);
  return XPCOM.NS_OK;
}    
}
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