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gecko-dev/xpcom/io/nsIStringStream.cpp

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25 KiB
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/* -*- 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.org code.
*
* The Initial Developer of the Original Code is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
*/
#include "nsIStringStream.h"
#include "nsIFileStream.h"
#include "prerror.h"
#include "nsFileSpec.h"
#include "plstr.h"
//========================================================================================
class BasicStringImpl
: public nsIOutputStream
, public nsIInputStream
, public nsIRandomAccessStore
//========================================================================================
{
public:
BasicStringImpl();
virtual ~BasicStringImpl();
NS_IMETHOD Seek(PRSeekWhence whence, PRInt32 offset);
NS_IMETHOD Tell(PRIntn* outWhere);
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;
NS_IMETHOD GetObserver(nsIInputStreamObserver * *aObserver);
NS_IMETHOD SetObserver(nsIInputStreamObserver * aObserver);
// 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 GetNonBlocking(PRBool *aNonBlocking);
NS_IMETHOD SetNonBlocking(PRBool aNonBlocking);
NS_IMETHOD GetObserver(nsIOutputStreamObserver * *aObserver);
NS_IMETHOD SetObserver(nsIOutputStreamObserver * aObserver);
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)
{
NS_INIT_REFCNT();
}
//----------------------------------------------------------------------------------------
BasicStringImpl::~BasicStringImpl()
//----------------------------------------------------------------------------------------
{
}
//----------------------------------------------------------------------------------------
NS_IMETHODIMP BasicStringImpl::Seek(PRSeekWhence 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 PR_SEEK_CUR: newPosition = mOffset + offset; break;
case PR_SEEK_SET: newPosition = offset; break;
case PR_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;
} // StringImpl::Seek
//----------------------------------------------------------------------------------------
NS_IMETHODIMP BasicStringImpl::Tell(PRIntn* outWhere)
//----------------------------------------------------------------------------------------
{
*outWhere = mOffset;
return NS_OK;
}
//----------------------------------------------------------------------------------------
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::GetObserver(nsIInputStreamObserver * *aObserver)
{
NS_NOTREACHED("GetObserver");
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHODIMP
BasicStringImpl::SetObserver(nsIInputStreamObserver * aObserver)
{
NS_NOTREACHED("SetObserver");
return NS_ERROR_NOT_IMPLEMENTED;
}
//----------------------------------------------------------------------------------------
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::GetNonBlocking(PRBool *aNonBlocking)
{
NS_NOTREACHED("GetNonBlocking");
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHODIMP
BasicStringImpl::SetNonBlocking(PRBool aNonBlocking)
{
NS_NOTREACHED("SetNonBlocking");
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHODIMP
BasicStringImpl::GetObserver(nsIOutputStreamObserver * *aObserver)
{
NS_NOTREACHED("GetObserver");
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHODIMP
BasicStringImpl::SetObserver(nsIOutputStreamObserver * aObserver)
{
NS_NOTREACHED("SetObserver");
return NS_ERROR_NOT_IMPLEMENTED;
}
//----------------------------------------------------------------------------------------
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 CharImpl
: public ConstCharImpl
//========================================================================================
{
enum { kAllocQuantum = 256 };
public:
CharImpl(char** inString, PRInt32 inLength = -1)
: ConstCharImpl(*inString, inLength)
, mString(*inString)
, mAllocLength(mLength + 1)
, mOriginalLength(mLength)
{
if (!mString)
{
mAllocLength = kAllocQuantum;
mString = new char[mAllocLength];
if (!mString)
{
mLastResult = NS_ERROR_OUT_OF_MEMORY;
return;
}
mConstString = mString;
*mString = '\0';
}
}
~CharImpl()
{
if (mString)
{
delete [] mString;
}
}
virtual PRInt32 write(const char* buf, PRUint32 aCount)
{
if (!buf)
return 0;
PRInt32 maxCount = mAllocLength - 1 - mOffset;
if ((PRInt32)aCount > maxCount)
{
mAllocLength = aCount + 1 + mOffset + kAllocQuantum;
char* newString = new char[mAllocLength];
if (!newString)
{
mLastResult = NS_ERROR_OUT_OF_MEMORY;
return 0;
}
memcpy(newString, mString, mLength);
delete [] mString;
mString = newString;
mConstString = newString;
}
memcpy(mString + mOffset, buf, aCount);
mOffset += aCount;
mLength += aCount;
if (mOffset > mOriginalLength)
mString[mOffset] = 0;
return aCount;
}
protected:
char*& mString;
size_t mAllocLength;
size_t mOriginalLength;
}; // class CharImpl
//========================================================================================
class ConstStringImpl
: public ConstCharImpl
//========================================================================================
{
public:
ConstStringImpl(const nsString& inString)
: ConstCharImpl(inString.ToNewCString(),
inString.Length())
{
}
ConstStringImpl(const nsCString& inString)
: ConstCharImpl(inString.ToNewCString(),
inString.Length())
{
}
~ConstStringImpl()
{
Recycle((char*)mConstString);
}
protected:
protected:
}; // class ConstStringImpl
//========================================================================================
class StringImpl
: public ConstStringImpl
// This is wrong, since it really converts to 1-char strings.
//========================================================================================
{
public:
StringImpl(nsString& inString)
: ConstStringImpl(inString)
, mString(inString)
{
}
protected:
virtual PRInt32 write(const char* buf, PRUint32 count)
{
if (!buf)
return 0;
// Clone our string as chars
char* cstring = mString.ToNewCString();
// Make a CharImpl and do the write
CharImpl chars(&cstring, mString.Length());
chars.Seek(PR_SEEK_SET, mOffset);
// Get the bytecount and result from the CharImpl
PRInt32 result = chars.write(buf,count);
mLastResult = chars.get_result();
// Set our string to match the new chars
chars.Seek(PR_SEEK_SET, 0);
PRUint32 newLength;
chars.Available(&newLength);
mString.AssignWithConversion(cstring, newLength);
// Set our const string also...
delete [] (char*)mConstString;
mConstString = cstring;
return result;
}
protected:
nsString& mString;
}; // class StringImpl
NS_IMPL_THREADSAFE_ADDREF(BasicStringImpl)
NS_IMPL_THREADSAFE_RELEASE(BasicStringImpl)
NS_IMPL_QUERY_HEAD(BasicStringImpl)
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(
nsISupports** aStreamResult,
const nsString& 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 = (nsISupports*)(void*)stream;
return NS_OK;
}
//----------------------------------------------------------------------------------------
extern "C" NS_COM nsresult NS_NewCStringInputStream(
nsISupports** aStreamResult,
const nsCString& 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 = (nsISupports*)(void*)stream;
return NS_OK;
}
//----------------------------------------------------------------------------------------
extern "C" NS_COM nsresult NS_NewStringOutputStream(
nsISupports** aStreamResult,
nsString& aStringToChange)
// Factory method to get an nsOutputStream 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;
StringImpl* stream = new StringImpl(aStringToChange);
if (! stream)
return NS_ERROR_OUT_OF_MEMORY;
NS_ADDREF(stream);
*aStreamResult = (nsISupports*)(void*)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_NewCharOutputStream(
nsISupports** aStreamResult,
char** aStringToChange)
// Factory method to get an nsOutputStream to a string. Result will implement all the
// file stream interfaces in nsIFileStream.h
//----------------------------------------------------------------------------------------
{
NS_PRECONDITION(aStreamResult != nsnull, "null ptr");
NS_PRECONDITION(aStringToChange != nsnull, "null ptr");
if (!aStreamResult || !aStringToChange)
return NS_ERROR_NULL_POINTER;
CharImpl* stream = new CharImpl(aStringToChange);
if (! stream)
return NS_ERROR_OUT_OF_MEMORY;
NS_ADDREF(stream);
*aStreamResult = (nsISupports*)(void*)stream;
return NS_OK;
}
//----------------------------------------------------------------------------------------
extern "C" NS_COM nsresult NS_NewStringIOStream(
nsISupports** aStreamResult,
nsString& aStringToChange)
// Factory method to get an nsOutputStream to a string. Result will implement all the
// file stream interfaces in nsIFileStream.h
//----------------------------------------------------------------------------------------
{
return NS_NewStringOutputStream(aStreamResult, aStringToChange);
}
//----------------------------------------------------------------------------------------
extern "C" NS_COM nsresult NS_NewCharIOStream(
nsISupports** aStreamResult,
char** aStringToChange)
// Factory method to get an nsOutputStream to a string. Result will implement all the
// file stream interfaces in nsIFileStream.h
//----------------------------------------------------------------------------------------
{
return NS_NewCharOutputStream(aStreamResult, aStringToChange);
}
//----------------------------------------------------------------------------------------
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;
}
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