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gecko-dev/xpcom/io/nsStringStream.cpp

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: NPL 1.1/GPL 2.0/LGPL 2.1
*
* 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.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* mcmullen@netscape.com (original author)
* warren@netscape.com
* alecf@netscape.com
* scc@mozilla.org
* david.gardiner@unisa.edu.au
* fur@netscape.com
* norris@netscape.com
* pinkerton@netscape.com
* davidm@netscape.com
* sfraser@netscape.com
* darin@netscape.com
*
* Alternatively, the contents of this file may be used under the terms of
* 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"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the NPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the NPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/**
* Based on original code from nsIStringStream.cpp
*/
#include "nsStringStream.h"
#include "nsIFileStream.h" // for nsIRandomAccessStore
#include "prerror.h"
#include "nsFileSpec.h"
#include "plstr.h"
#include "nsReadableUtils.h"
//========================================================================================
class BasicStringImpl
: public nsIOutputStream
, public nsIInputStream
, public nsIRandomAccessStore
//========================================================================================
{
public:
BasicStringImpl();
virtual ~BasicStringImpl();
NS_DECL_NSISEEKABLESTREAM
NS_IMETHOD GetAtEOF(PRBool* outAtEOF);
NS_IMETHOD SetAtEOF(PRBool inAtEOF);
NS_IMETHOD Available(PRUint32 *aLength);
NS_IMETHOD Read(char* aBuf,
PRUint32 aCount,
PRUint32 *aReadCount);
NS_IMETHOD ReadSegments(nsWriteSegmentFun writer, void * closure, PRUint32 count, PRUint32 *_retval) = 0;
// nsIOutputStream interface
NS_IMETHOD Write(const char* aBuf,
PRUint32 aCount,
PRUint32 *aWriteCount);
NS_IMETHOD WriteFrom(nsIInputStream *inStr, PRUint32 count, PRUint32 *_retval);
NS_IMETHOD WriteSegments(nsReadSegmentFun reader, void * closure, PRUint32 count, PRUint32 *_retval);
NS_IMETHOD IsNonBlocking(PRBool *aNonBlocking);
public:
// nsISupports interface
NS_DECL_ISUPPORTS
NS_IMETHOD Close() { return NS_OK; }
// nsIInputStream interface
NS_IMETHOD Flush() { return NS_OK; }
public:
nsresult get_result() const { return mLastResult; }
protected:
virtual PRInt32 length() const = 0;
virtual PRInt32 read(char* buf, PRUint32 count) = 0;
virtual PRInt32 write(const char*, PRUint32);
protected:
PRUint32 mOffset;
nsresult mLastResult;
PRBool mEOF;
}; // class BasicStringImpl
//----------------------------------------------------------------------------------------
BasicStringImpl::BasicStringImpl()
//----------------------------------------------------------------------------------------
: mOffset(0)
, mLastResult(NS_OK)
, mEOF(PR_FALSE)
{
}
//----------------------------------------------------------------------------------------
BasicStringImpl::~BasicStringImpl()
//----------------------------------------------------------------------------------------
{
}
//----------------------------------------------------------------------------------------
NS_IMETHODIMP BasicStringImpl::Seek(PRInt32 whence, PRInt32 offset)
//----------------------------------------------------------------------------------------
{
mLastResult = NS_OK; // reset on a seek.
mEOF = PR_FALSE; // reset on a seek.
PRInt32 fileSize = length();
PRInt32 newPosition=-1;
switch (whence)
{
case NS_SEEK_CUR: newPosition = mOffset + offset; break;
case NS_SEEK_SET: newPosition = offset; break;
case NS_SEEK_END: newPosition = fileSize + offset; break;
}
if (newPosition < 0)
{
newPosition = 0;
mLastResult = NS_FILE_RESULT(PR_FILE_SEEK_ERROR);
}
if (newPosition >= fileSize)
{
newPosition = fileSize;
mEOF = PR_TRUE;
}
mOffset = newPosition;
return NS_OK;
} // BasicStringImpl::Seek
//----------------------------------------------------------------------------------------
NS_IMETHODIMP BasicStringImpl::Tell(PRUint32* outWhere)
//----------------------------------------------------------------------------------------
{
*outWhere = mOffset;
return NS_OK;
}
//----------------------------------------------------------------------------------------
NS_IMETHODIMP BasicStringImpl::SetEOF()
//----------------------------------------------------------------------------------------
{
NS_NOTYETIMPLEMENTED("BasicStringImpl::SetEOF");
return NS_ERROR_NOT_IMPLEMENTED;
}
//----------------------------------------------------------------------------------------
NS_IMETHODIMP BasicStringImpl::GetAtEOF(PRBool* outAtEOF)
//----------------------------------------------------------------------------------------
{
*outAtEOF = mEOF;
return NS_OK;
}
//----------------------------------------------------------------------------------------
NS_IMETHODIMP BasicStringImpl::SetAtEOF(PRBool inAtEOF)
//----------------------------------------------------------------------------------------
{
mEOF = inAtEOF;
return NS_OK;
}
//----------------------------------------------------------------------------------------
NS_IMETHODIMP BasicStringImpl::Available(PRUint32 *aLength)
//----------------------------------------------------------------------------------------
{
NS_PRECONDITION(aLength != nsnull, "null ptr");
if (!aLength)
return NS_ERROR_NULL_POINTER;
*aLength = length();
return NS_OK;
}
//----------------------------------------------------------------------------------------
NS_IMETHODIMP BasicStringImpl::Read(char* aBuf, PRUint32 aCount, PRUint32 *aReadCount)
//----------------------------------------------------------------------------------------
{
NS_PRECONDITION(aBuf != nsnull, "null ptr");
if (!aBuf)
return NS_ERROR_NULL_POINTER;
NS_PRECONDITION(aReadCount != nsnull, "null ptr");
if (!aReadCount)
return NS_ERROR_NULL_POINTER;
if (NS_FAILED(mLastResult))
return mLastResult;
PRInt32 bytesRead = read(aBuf, aCount);
if (NS_FAILED(mLastResult))
{
*aReadCount = 0;
return mLastResult;
}
*aReadCount = bytesRead;
if (bytesRead < (PRInt32)aCount)
SetAtEOF(PR_TRUE);
return NS_OK;
}
//----------------------------------------------------------------------------------------
NS_IMETHODIMP BasicStringImpl::Write(const char* aBuf, PRUint32 aCount, PRUint32 *aWriteCount)
//----------------------------------------------------------------------------------------
{
NS_PRECONDITION(aBuf != nsnull, "null ptr");
NS_PRECONDITION(aWriteCount != nsnull, "null ptr");
if (NS_FAILED(mLastResult))
return mLastResult;
PRInt32 bytesWrit = write(aBuf, aCount);
if (NS_FAILED(mLastResult))
{
*aWriteCount = 0;
return mLastResult;
}
*aWriteCount = bytesWrit;
return NS_OK;
}
NS_IMETHODIMP
BasicStringImpl::WriteFrom(nsIInputStream *inStr, PRUint32 count, PRUint32 *result)
{
NS_NOTREACHED("WriteFrom");
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHODIMP
BasicStringImpl::WriteSegments(nsReadSegmentFun reader, void * closure,
PRUint32 count, PRUint32 *result)
{
NS_NOTREACHED("WriteSegments");
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHODIMP
BasicStringImpl::IsNonBlocking(PRBool *aNonBlocking)
{
*aNonBlocking = PR_TRUE;
return NS_OK;
}
//----------------------------------------------------------------------------------------
PRInt32 BasicStringImpl::write(const char*, PRUint32)
//----------------------------------------------------------------------------------------
{
NS_ASSERTION(PR_FALSE, "Write to a const string");
mLastResult = NS_FILE_RESULT(PR_ILLEGAL_ACCESS_ERROR);
return -1;
}
#ifdef XP_MAC
#pragma mark -
#endif
//========================================================================================
class ConstCharImpl
: public BasicStringImpl
//========================================================================================
{
public:
ConstCharImpl(const char* inString, PRInt32 inLength = -1)
: mConstString(inString),
mLength(inLength == -1 ?
(inString ? strlen(inString) : 0) : inLength) {}
protected:
virtual PRInt32 length() const
{
return mLength - mOffset;
}
virtual PRInt32 read(char* buf, PRUint32 aCount)
{
PRInt32 maxCount = mLength - mOffset;
if ((PRInt32)aCount > maxCount)
aCount = maxCount;
memcpy(buf, mConstString + mOffset, aCount);
mOffset += aCount;
return aCount;
}
NS_IMETHOD ReadSegments(nsWriteSegmentFun writer, void * closure,
PRUint32 aCount, PRUint32 *result) {
nsresult rv;
PRInt32 maxCount = mLength - mOffset;
if ((PRInt32)aCount > maxCount)
aCount = maxCount;
rv = writer(this, closure, mConstString + mOffset,
0, aCount, result);
if (NS_SUCCEEDED(rv))
mOffset += *result;
return rv;
}
protected:
const char* mConstString;
size_t mLength;
}; // class ConstCharImpl
//========================================================================================
class ConstStringImpl
: public ConstCharImpl
//========================================================================================
{
public:
ConstStringImpl(const nsAString& inString)
: ConstCharImpl(ToNewCString(inString),
inString.Length())
{
}
ConstStringImpl(const nsACString& inString)
: ConstCharImpl(ToNewCString(inString),
inString.Length())
{
}
~ConstStringImpl()
{
Recycle((char*)mConstString);
}
protected:
protected:
}; // class ConstStringImpl
NS_IMPL_THREADSAFE_ADDREF(BasicStringImpl)
NS_IMPL_THREADSAFE_RELEASE(BasicStringImpl)
NS_IMPL_QUERY_HEAD(BasicStringImpl)
NS_IMPL_QUERY_BODY(nsISeekableStream)
NS_IMPL_QUERY_BODY(nsIRandomAccessStore)
NS_IMPL_QUERY_BODY(nsIOutputStream)
NS_IMPL_QUERY_BODY(nsIInputStream)
NS_IMPL_QUERY_TAIL(nsIOutputStream)
//----------------------------------------------------------------------------------------
extern "C" NS_COM nsresult NS_NewStringInputStream(
nsIInputStream** aStreamResult,
const nsAString& aStringToRead)
// Factory method to get an nsInputStream from a string. Result will implement all the
// file stream interfaces in nsIFileStream.h
//----------------------------------------------------------------------------------------
{
NS_PRECONDITION(aStreamResult != nsnull, "null ptr");
if (! aStreamResult)
return NS_ERROR_NULL_POINTER;
ConstStringImpl* stream = new ConstStringImpl(aStringToRead);
if (! stream)
return NS_ERROR_OUT_OF_MEMORY;
NS_ADDREF(stream);
*aStreamResult = NS_STATIC_CAST(nsIInputStream*,stream);
return NS_OK;
}
//----------------------------------------------------------------------------------------
extern "C" NS_COM nsresult NS_NewCStringInputStream(
nsIInputStream** aStreamResult,
const nsACString& aStringToRead)
// Factory method to get an nsInputStream from a cstring. Result will implement all the
// file stream interfaces in nsIFileStream.h
//----------------------------------------------------------------------------------------
{
NS_PRECONDITION(aStreamResult != nsnull, "null ptr");
if (! aStreamResult)
return NS_ERROR_NULL_POINTER;
ConstStringImpl* stream = new ConstStringImpl(aStringToRead);
if (! stream)
return NS_ERROR_OUT_OF_MEMORY;
NS_ADDREF(stream);
*aStreamResult = NS_STATIC_CAST(nsIInputStream*,stream);
return NS_OK;
}
//----------------------------------------------------------------------------------------
extern "C" NS_COM nsresult NS_NewCharInputStream(
nsISupports** aStreamResult,
const char* aStringToRead)
// Factory method to get an nsInputStream from a string. Result will implement all the
// file stream interfaces in nsIFileStream.h
//----------------------------------------------------------------------------------------
{
NS_PRECONDITION(aStreamResult != nsnull, "null ptr");
if (! aStreamResult)
return NS_ERROR_NULL_POINTER;
ConstCharImpl* stream = new ConstCharImpl(aStringToRead);
if (! stream)
return NS_ERROR_OUT_OF_MEMORY;
NS_ADDREF(stream);
*aStreamResult = (nsISupports*)(void*)stream;
return NS_OK;
}
//----------------------------------------------------------------------------------------
extern "C" NS_COM nsresult NS_NewByteInputStream(
nsISupports** aStreamResult,
const char* aStringToRead,
PRInt32 aLength)
// Factory method to get an nsInputStream from a string. Result will implement all the
// file stream interfaces in nsIFileStream.h
//----------------------------------------------------------------------------------------
{
NS_PRECONDITION(aStreamResult != nsnull, "null ptr");
if (! aStreamResult)
return NS_ERROR_NULL_POINTER;
ConstCharImpl* stream = new ConstCharImpl(aStringToRead, aLength);
if (! stream)
return NS_ERROR_OUT_OF_MEMORY;
NS_ADDREF(stream);
*aStreamResult = (nsISupports*)(void*)stream;
return NS_OK;
}
//----------------------------------------------------------------------------------------
// nsIStringInputStream implementation
//----------------------------------------------------------------------------------------
class nsStringInputStream : public ConstCharImpl
, public nsIStringInputStream
{
public:
NS_DECL_ISUPPORTS_INHERITED
NS_DECL_NSISTRINGINPUTSTREAM
nsStringInputStream() : ConstCharImpl(nsnull, -1), mOwned(PR_FALSE) {}
virtual ~nsStringInputStream();
protected:
PRBool mOwned;
};
nsStringInputStream::~nsStringInputStream()
{
if (mOwned)
nsMemory::Free((char *) mConstString);
}
NS_IMETHODIMP
nsStringInputStream::SetData(const char *data, PRInt32 dataLen)
{
if (dataLen < 0)
dataLen = strlen(data);
return AdoptData(nsCRT::strndup(data, dataLen), dataLen);
}
NS_IMETHODIMP
nsStringInputStream::AdoptData(char *data, PRInt32 dataLen)
{
NS_ENSURE_ARG_POINTER(data);
if (dataLen < 0)
dataLen = strlen(data);
mConstString = (const char *) data;
mLength = dataLen;
mOwned = PR_TRUE;
return NS_OK;
}
NS_IMETHODIMP
nsStringInputStream::ShareData(const char *data, PRInt32 dataLen)
{
NS_ENSURE_ARG_POINTER(data);
if (dataLen < 0)
dataLen = strlen(data);
mConstString = data;
mLength = dataLen;
mOwned = PR_FALSE;
return NS_OK;
}
NS_IMPL_ISUPPORTS_INHERITED1(nsStringInputStream,
ConstCharImpl,
nsIStringInputStream)
// factory method for constructing a nsStringInputStream object
NS_METHOD
nsStringInputStreamConstructor(nsISupports *outer, REFNSIID iid, void **result)
{
*result = nsnull;
if (nsnull != outer)
return NS_ERROR_NO_AGGREGATION;
nsStringInputStream *inst;
NS_NEWXPCOM(inst, nsStringInputStream);
if (!inst)
return NS_ERROR_OUT_OF_MEMORY;
NS_ADDREF(inst);
nsresult rv = inst->QueryInterface(iid, result);
NS_RELEASE(inst);
return rv;
}
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