mirror of
https://github.com/mozilla/gecko-dev.git
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321 lines
8.9 KiB
C++
321 lines
8.9 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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*/
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#define NS_IMPL_IDS
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#include "nsIUnicharInputStream.h"
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#include "nsIByteBuffer.h"
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#include "nsIUnicharBuffer.h"
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#include "nsIServiceManager.h"
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#include "nsICharsetConverterManager.h"
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#include "nsIUnicodeDecoder.h"
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#include "nsString.h"
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#include "nsCRT.h"
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#include <fcntl.h>
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#ifdef NS_WIN32
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#include <io.h>
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#else
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#include <unistd.h>
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#endif
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static NS_DEFINE_CID(kCharsetConverterManagerCID, NS_ICHARSETCONVERTERMANAGER_CID);
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class StringUnicharInputStream : public nsIUnicharInputStream {
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public:
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StringUnicharInputStream(nsString* aString);
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virtual ~StringUnicharInputStream();
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NS_DECL_ISUPPORTS
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NS_IMETHOD Read(PRUnichar* aBuf,
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PRUint32 aOffset,
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PRUint32 aCount,
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PRUint32 *aReadCount);
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NS_IMETHOD Close();
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nsString* mString;
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PRUint32 mPos;
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PRUint32 mLen;
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};
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StringUnicharInputStream::StringUnicharInputStream(nsString* aString)
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{
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NS_INIT_REFCNT();
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mString = aString;
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mPos = 0;
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mLen = aString->Length();
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}
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StringUnicharInputStream::~StringUnicharInputStream()
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{
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if (nsnull != mString) {
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delete mString;
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}
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}
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nsresult StringUnicharInputStream::Read(PRUnichar* aBuf,
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PRUint32 aOffset,
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PRUint32 aCount,
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PRUint32 *aReadCount)
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{
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if (mPos >= mLen) {
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*aReadCount = 0;
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return (nsresult)-1;
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}
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const PRUnichar* us = mString->GetUnicode();
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NS_ASSERTION(mLen >= mPos, "unsigned madness");
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PRUint32 amount = mLen - mPos;
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if (amount > aCount) {
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amount = aCount;
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}
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nsCRT::memcpy(aBuf + aOffset, us + mPos, sizeof(PRUnichar) * amount);
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mPos += amount;
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*aReadCount = amount;
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return NS_OK;
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}
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nsresult StringUnicharInputStream::Close()
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{
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mPos = mLen;
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if (nsnull != mString) {
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delete mString;
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}
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return NS_OK;
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}
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NS_IMPL_ISUPPORTS1(StringUnicharInputStream, nsIUnicharInputStream)
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NS_COM nsresult
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NS_NewStringUnicharInputStream(nsIUnicharInputStream** aInstancePtrResult,
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nsString* aString)
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{
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NS_PRECONDITION(nsnull != aString, "null ptr");
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NS_PRECONDITION(nsnull != aInstancePtrResult, "null ptr");
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if ((nsnull == aString) || (nsnull == aInstancePtrResult)) {
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return NS_ERROR_NULL_POINTER;
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}
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StringUnicharInputStream* it = new StringUnicharInputStream(aString);
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if (nsnull == it) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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return it->QueryInterface(NS_GET_IID(nsIUnicharInputStream),
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(void**) aInstancePtrResult);
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}
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//----------------------------------------------------------------------
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/**
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* This function used to be public, with the NS_COM declaration. I am
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* changing it right now into a module private visibility because there are
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* better and more xpcom-like ways to get a Converter.
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*/
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nsresult NS_NewB2UConverter(nsIUnicodeDecoder** aInstancePtrResult, nsISupports* aOuter, nsString* aCharSet);
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nsresult
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NS_NewB2UConverter(nsIUnicodeDecoder** aInstancePtrResult,
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nsISupports* aOuter,
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nsString* aCharSet)
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{
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if (nsnull != aOuter) {
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return NS_ERROR_NO_AGGREGATION;
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}
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// Create converter
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nsresult res;
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nsAutoString defaultCharset;
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defaultCharset.AssignWithConversion("ISO-8859-1");
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if (aCharSet == nsnull) aCharSet = &defaultCharset;
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NS_WITH_SERVICE(nsICharsetConverterManager, ccm, kCharsetConverterManagerCID, &res);
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if (NS_FAILED(res)) return res;
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return ccm->GetUnicodeDecoder(aCharSet, aInstancePtrResult);
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}
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//----------------------------------------------------------------------
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class ConverterInputStream : public nsIUnicharInputStream {
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public:
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ConverterInputStream(nsIInputStream* aStream,
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nsIUnicodeDecoder* aConverter,
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PRUint32 aBufSize);
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virtual ~ConverterInputStream();
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NS_DECL_ISUPPORTS
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NS_IMETHOD Read(PRUnichar* aBuf,
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PRUint32 aOffset,
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PRUint32 aCount,
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PRUint32 *aReadCount);
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NS_IMETHOD Close();
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protected:
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PRInt32 Fill(nsresult * aErrorCode);
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nsIInputStream* mInput;
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nsIUnicodeDecoder* mConverter;
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nsIByteBuffer* mByteData;
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PRUint32 mByteDataOffset;
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nsIUnicharBuffer* mUnicharData;
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PRUint32 mUnicharDataOffset;
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PRUint32 mUnicharDataLength;
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};
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ConverterInputStream::ConverterInputStream(nsIInputStream* aStream,
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nsIUnicodeDecoder* aConverter,
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PRUint32 aBufferSize)
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{
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NS_INIT_REFCNT();
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mInput = aStream; aStream->AddRef();
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mConverter = aConverter; aConverter->AddRef();
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if (aBufferSize == 0) {
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aBufferSize = 8192;
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}
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// XXX what if these fail?
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NS_NewByteBuffer(&mByteData, nsnull, aBufferSize);
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NS_NewUnicharBuffer(&mUnicharData, nsnull, aBufferSize);
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mByteDataOffset = 0;
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mUnicharDataOffset = 0;
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mUnicharDataLength = 0;
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}
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NS_IMPL_ISUPPORTS1(ConverterInputStream,nsIUnicharInputStream)
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ConverterInputStream::~ConverterInputStream()
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{
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Close();
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}
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nsresult ConverterInputStream::Close()
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{
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if (nsnull != mInput) {
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mInput->Release();
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mInput = nsnull;
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}
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if (nsnull != mConverter) {
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mConverter->Release();
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mConverter = nsnull;
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}
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if (nsnull != mByteData) {
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mByteData->Release();
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mByteData = nsnull;
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}
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if (nsnull != mUnicharData) {
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mUnicharData->Release();
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mUnicharData = nsnull;
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}
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return NS_OK;
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}
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nsresult ConverterInputStream::Read(PRUnichar* aBuf,
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PRUint32 aOffset,
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PRUint32 aCount,
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PRUint32 *aReadCount)
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{
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NS_ASSERTION(mUnicharDataLength >= mUnicharDataOffset, "unsigned madness");
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PRUint32 rv = mUnicharDataLength - mUnicharDataOffset;
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nsresult errorCode;
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if (0 == rv) {
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// Fill the unichar buffer
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rv = Fill(&errorCode);
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if (rv <= 0) {
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*aReadCount = 0;
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return errorCode;
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}
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}
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if (rv > aCount) {
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rv = aCount;
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}
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nsCRT::memcpy(aBuf + aOffset, mUnicharData->GetBuffer() + mUnicharDataOffset,
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rv * sizeof(PRUnichar));
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mUnicharDataOffset += rv;
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*aReadCount = rv;
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return NS_OK;
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}
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PRInt32 ConverterInputStream::Fill(nsresult * aErrorCode)
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{
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if (nsnull == mInput) {
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// We already closed the stream!
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*aErrorCode = NS_BASE_STREAM_CLOSED;
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return -1;
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}
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NS_ASSERTION(mByteData->GetLength() >= mByteDataOffset, "unsigned madness");
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PRUint32 remainder = mByteData->GetLength() - mByteDataOffset;
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mByteDataOffset = remainder;
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PRInt32 nb = mByteData->Fill(aErrorCode, mInput, remainder);
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if (nb <= 0) {
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// Because we assume a many to one conversion, the lingering data
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// in the byte buffer must be a partial conversion
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// fragment. Because we know that we have recieved no more new
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// data to add to it, we can't convert it. Therefore, we discard
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// it.
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return nb;
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}
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NS_ASSERTION(remainder + nb == mByteData->GetLength(), "bad nb");
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// Now convert as much of the byte buffer to unicode as possible
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PRInt32 dstLen = mUnicharData->GetBufferSize();
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PRInt32 srcLen = remainder + nb;
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*aErrorCode = mConverter->Convert(mByteData->GetBuffer(), &srcLen,
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mUnicharData->GetBuffer(), &dstLen);
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mUnicharDataOffset = 0;
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mUnicharDataLength = dstLen;
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mByteDataOffset += srcLen;
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return dstLen;
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}
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// XXX hook up auto-detect here (do we need more info, like the url?)
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NS_COM nsresult
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NS_NewConverterStream(nsIUnicharInputStream** aInstancePtrResult,
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nsISupports* aOuter,
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nsIInputStream* aStreamToWrap,
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PRInt32 aBufferSize,
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nsString* aCharSet)
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{
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if (nsnull != aOuter) {
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return NS_ERROR_NO_AGGREGATION;
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}
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// Create converter
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nsIUnicodeDecoder* converter;
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nsresult rv = NS_NewB2UConverter(&converter, nsnull, aCharSet);
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if (NS_OK != rv) {
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return rv;
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}
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// Create converter input stream
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ConverterInputStream* it =
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new ConverterInputStream(aStreamToWrap, converter, aBufferSize);
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NS_RELEASE(converter);
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if (nsnull == it) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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return it->QueryInterface(NS_GET_IID(nsIUnicharInputStream),
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(void **) aInstancePtrResult);
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}
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