Add ByteArrayInoutStream. Not part of the build yet

git-svn-id: svn://10.0.0.236/trunk@63669 18797224-902f-48f8-a5cc-f745e15eee43

mozilla/xpcom/io/nsByteArrayInputStream.cpp

@@ -0,0 +1,106 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * The contents of this file are subject to the Netscape Public
+ * License Version 1.1 (the "License"); you may not use this file
+ * except in compliance with the License. You may obtain a copy of
+ * the License at http://www.mozilla.org/NPL/
+ *  
+ * Software distributed under the License is distributed on an "AS
+ * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
+ * implied. See the License for the specific language governing
+ * rights and limitations under the License.
+ *  
+ * The Original Code is Mozilla Communicator client code, released
+ * March 31, 1998.
+ * 
+ * The Initial Developer of the Original Code is Netscape
+ * Communications Corporation. Portions created by Netscape are
+ * Copyright (C) 1998-1999 Netscape Communications Corporation. All
+ * Rights Reserved.
+ *
+ */
+
+#include "nsByteArrayInputStream.h"
+#include "nsIAllocator.h"
+
+nsByteArrayInputStream::nsByteArrayInputStream (char *buffer, PRUint32 bytes)
+    : _buffer (buffer), _nbytes (bytes), _pos (0)
+{ 
+}
+
+nsByteArrayInputStream::~nsByteArrayInputStream ()
+{
+    if (_buffer != NULL)
+        nsAllocator::Free (_buffer);
+}
+
+NS_IMPL_THREADSAFE_ISUPPORTS (nsByteArrayInputStream, NS_GET_IID (nsIByteArrayInputStream))
+
+NS_IMETHODIMP
+nsByteArrayInputStream::Available (PRUint32* aResult)
+{
+    if (aResult == NULL)
+        return NS_ERROR_NULL_POINTER;
+
+    if (_nbytes == 0)
+        *aResult = 0;
+    else
+        *aResult = _nbytes - _pos;
+
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsByteArrayInputStream::Read (char* aBuffer, PRUint32 aCount, PRUint32 *aNumRead)
+{
+    if (aBuffer == NULL || aNumRead == NULL)
+        return NS_ERROR_NULL_POINTER;
+
+    if (_nbytes == 0)
+        return NS_ERROR_FAILURE;
+
+    if (aCount == 0 || _pos == _nbytes)
+        *aNumRead = 0;
+    else
+    if (aCount > _nbytes - _pos)
+    {
+        memcpy (aBuffer, &_buffer[_pos], *aNumRead = _nbytes - _pos);
+        _pos = _nbytes;
+    }
+    else
+    {
+        memcpy (aBuffer, &_buffer[_pos], *aNumRead = aCount);
+        _pos += aCount;
+    }
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsByteArrayInputStream::Close ()
+{
+    if (_buffer != NULL)
+    {
+        nsAllocator::Free (_buffer);
+        _buffer = NULL;
+        _nbytes = 0;
+    }
+    else
+        return NS_ERROR_FAILURE;
+
+    return NS_OK;
+}
+
+NS_COM nsresult
+NS_NewByteArrayInputStream (nsIByteArrayInputStream* *aResult, char * buffer, unsigned long bytes)
+{
+    if (aResult == NULL)
+        return NS_ERROR_NULL_POINTER;
+
+    nsIByteArrayInputStream * stream = new nsByteArrayInputStream (buffer, bytes);
+
+    if (!stream)
+        return NS_ERROR_OUT_OF_MEMORY;
+
+    NS_ADDREF (stream);
+    *aResult = stream;
+    return NS_OK;
+}