gecko-dev/xpcom/io/nsScriptableInputStream.cpp

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3.4 KiB
C++

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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* The Original Code is mozilla.org code.
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* The Initial Developer of the Original Code is
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* the Initial Developer. All Rights Reserved.
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*
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* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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#include "nsScriptableInputStream.h"
#include "nsMemory.h"
NS_IMPL_ISUPPORTS1(nsScriptableInputStream, nsIScriptableInputStream);
// nsIBaseStream methods
NS_IMETHODIMP
nsScriptableInputStream::Close(void) {
if (!mInputStream) return NS_ERROR_NOT_INITIALIZED;
return mInputStream->Close();
}
// nsIScriptableInputStream methods
NS_IMETHODIMP
nsScriptableInputStream::Init(nsIInputStream *aInputStream) {
if (!aInputStream) return NS_ERROR_NULL_POINTER;
mInputStream = aInputStream;
return NS_OK;
}
NS_IMETHODIMP
nsScriptableInputStream::Available(PRUint32 *_retval) {
if (!mInputStream) return NS_ERROR_NOT_INITIALIZED;
return mInputStream->Available(_retval);
}
NS_IMETHODIMP
nsScriptableInputStream::Read(PRUint32 aCount, char **_retval) {
nsresult rv = NS_OK;
PRUint32 count = 0;
char *buffer = nsnull;
if (!mInputStream) return NS_ERROR_NOT_INITIALIZED;
rv = mInputStream->Available(&count);
if (NS_FAILED(rv)) return rv;
count = PR_MIN(count, aCount);
buffer = (char*)nsMemory::Alloc(count+1); // make room for '\0'
if (!buffer) return NS_ERROR_OUT_OF_MEMORY;
PRUint32 amtRead = 0;
rv = mInputStream->Read(buffer, count, &amtRead);
if (NS_FAILED(rv)) {
nsMemory::Free(buffer);
return rv;
}
buffer[amtRead] = '\0';
*_retval = buffer;
return NS_OK;
}
NS_METHOD
nsScriptableInputStream::Create(nsISupports *aOuter, REFNSIID aIID, void **aResult) {
if (aOuter) return NS_ERROR_NO_AGGREGATION;
nsScriptableInputStream *sis = new nsScriptableInputStream();
if (!sis) return NS_ERROR_OUT_OF_MEMORY;
NS_ADDREF(sis);
nsresult rv = sis->QueryInterface(aIID, aResult);
NS_RELEASE(sis);
return rv;
}