diff options
Diffstat (limited to 'src/libs/xpcom18a4/xpcom/io/nsStringStream.cpp')
| -rw-r--r-- | src/libs/xpcom18a4/xpcom/io/nsStringStream.cpp | 457 |
1 files changed, 457 insertions, 0 deletions
diff --git a/src/libs/xpcom18a4/xpcom/io/nsStringStream.cpp b/src/libs/xpcom18a4/xpcom/io/nsStringStream.cpp new file mode 100644 index 00000000..536eab11 --- /dev/null +++ b/src/libs/xpcom18a4/xpcom/io/nsStringStream.cpp @@ -0,0 +1,457 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ +/* ***** BEGIN LICENSE BLOCK ***** + * Version: MPL 1.1/GPL 2.0/LGPL 2.1 + * + * The contents of this file are subject to the Mozilla 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/MPL/ + * + * 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 + * bzbarsky@mit.edu + * + * Alternatively, the contents of this file may be used under the terms of + * either of 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 MPL, 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 MPL, the GPL or the LGPL. + * + * ***** END LICENSE BLOCK ***** */ + +/** + * Based on original code from nsIStringStream.cpp + */ + +#include "nsStringStream.h" + +#include "prerror.h" +#include "plstr.h" +#include "nsReadableUtils.h" +#include "nsCRT.h" +#include "nsISeekableStream.h" +#include "nsInt64.h" + +#define NS_FILE_RESULT(x) ns_file_convert_result((PRInt32)x) +#define NS_FILE_FAILURE NS_FILE_RESULT(-1) + +static nsresult ns_file_convert_result(PRInt32 nativeErr) +{ + return nativeErr ? + NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_FILES,((nativeErr)&0xFFFF)) + : NS_OK; +} + +//----------------------------------------------------------------------------- +// nsIStringInputStream implementation +//----------------------------------------------------------------------------- + +class nsStringInputStream : public nsIStringInputStream + , public nsIRandomAccessStore + +{ +public: + nsStringInputStream() + : mOffset(0) + , mLastResult(NS_OK) + , mEOF(PR_FALSE) + , mOwned(PR_FALSE) + , mConstString(nsnull) + , mLength(0) + {} + +private: + ~nsStringInputStream() + { + if (mOwned) + nsMemory::Free((char*)mConstString); + } + +public: + NS_DECL_ISUPPORTS + + NS_DECL_NSISTRINGINPUTSTREAM + NS_DECL_NSIINPUTSTREAM + + // nsIRandomAccessStore interface + NS_IMETHOD GetAtEOF(PRBool* outAtEOF); + NS_IMETHOD SetAtEOF(PRBool inAtEOF); + + NS_DECL_NSISEEKABLESTREAM + +protected: + PRInt32 LengthRemaining() const + { + return mLength - mOffset; + } + + void Clear() + { + NS_ASSERTION(mConstString || !mOwned, + "Can't have mOwned set and have a null string!"); + if (mOwned) + nsMemory::Free((char*)mConstString); + + // We're about to get a new string; clear the members that + // would no longer have valid values. + mOffset = 0; + mLastResult = NS_OK; + mEOF = PR_FALSE; + } + + PRInt32 mOffset; + nsresult mLastResult; + PRPackedBool mEOF; + PRPackedBool mOwned; + const char* mConstString; + PRInt32 mLength; +}; + +NS_IMPL_THREADSAFE_ISUPPORTS4(nsStringInputStream, + nsIStringInputStream, + nsIInputStream, + nsIRandomAccessStore, + nsISeekableStream) + +///////// +// nsIStringInputStream implementation +///////// +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); + + Clear(); + + 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); + + Clear(); + + mConstString = data; + mLength = dataLen; + mOwned = PR_FALSE; + return NS_OK; +} + +///////// +// nsIInputStream implementation +///////// +NS_IMETHODIMP nsStringInputStream::Close() +{ + return NS_OK; +} + +NS_IMETHODIMP nsStringInputStream::Available(PRUint32 *aLength) +{ + NS_PRECONDITION(aLength != nsnull, "null ptr"); + if (!aLength) + return NS_ERROR_NULL_POINTER; + *aLength = LengthRemaining(); + return NS_OK; +} + +NS_IMETHODIMP nsStringInputStream::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; + PRInt32 maxCount = mLength - mOffset; + if ((PRInt32)aCount > maxCount) + bytesRead = maxCount; + else + bytesRead = aCount; + + memcpy(aBuf, mConstString + mOffset, bytesRead); + mOffset += bytesRead; + + *aReadCount = bytesRead; + if (bytesRead < (PRInt32)aCount) + SetAtEOF(PR_TRUE); + return NS_OK; +} + + +NS_IMETHODIMP +nsStringInputStream::ReadSegments(nsWriteSegmentFun writer, void * closure, + PRUint32 aCount, PRUint32 * result) +{ + nsresult rv; + PRInt32 maxCount = mLength - mOffset; + if (maxCount == 0) { + *result = 0; + return NS_OK; + } + if ((PRInt32)aCount > maxCount) + aCount = maxCount; + rv = writer(this, closure, mConstString + mOffset, + 0, aCount, result); + if (NS_SUCCEEDED(rv)) + mOffset += *result; + // errors returned from the writer end here! + return NS_OK; +} + +NS_IMETHODIMP +nsStringInputStream::IsNonBlocking(PRBool *aNonBlocking) +{ + *aNonBlocking = PR_TRUE; + return NS_OK; +} + + +///////// +// nsISeekableStream implementation +///////// +NS_IMETHODIMP nsStringInputStream::Seek(PRInt32 whence, PRInt64 offset) +{ + mLastResult = NS_OK; // reset on a seek. + const nsInt64 maxUint32 = PR_UINT32_MAX; + nsInt64 offset64(offset); + PRInt32 offset32; + LL_L2I(offset32, offset); + + NS_ASSERTION(maxUint32 > offset64, "string streams only support 32 bit offsets"); + mEOF = PR_FALSE; // reset on a seek. + PRInt32 fileSize = LengthRemaining(); + PRInt32 newPosition=-1; + switch (whence) + { + case NS_SEEK_CUR: newPosition = mOffset + offset32; break; + case NS_SEEK_SET: newPosition = offset32; break; + case NS_SEEK_END: newPosition = fileSize + offset32; 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; +} + + +NS_IMETHODIMP nsStringInputStream::Tell(PRInt64* outWhere) +{ + *outWhere = mOffset; + return NS_OK; +} + +NS_IMETHODIMP nsStringInputStream::SetEOF() +{ + NS_NOTYETIMPLEMENTED("nsStringInputStream::SetEOF"); + return NS_ERROR_NOT_IMPLEMENTED; +} + +///////// +// nsIRandomAccessStore implementation +///////// +NS_IMETHODIMP nsStringInputStream::GetAtEOF(PRBool* outAtEOF) +{ + *outAtEOF = mEOF; + return NS_OK; +} + +NS_IMETHODIMP nsStringInputStream::SetAtEOF(PRBool inAtEOF) +{ + mEOF = inAtEOF; + return NS_OK; +} + +// Factory method to get an nsInputStream from an nsAString. Result will +// implement nsIStringInputStream and nsIRandomAccessStore +extern "C" NS_COM nsresult +NS_NewStringInputStream(nsIInputStream** aStreamResult, + const nsAString& aStringToRead) +{ + NS_PRECONDITION(aStreamResult, "null out ptr"); + + char* data = ToNewCString(aStringToRead); + if (!data) + return NS_ERROR_OUT_OF_MEMORY; + + nsStringInputStream* stream = new nsStringInputStream(); + if (! stream) { + nsMemory::Free(data); + return NS_ERROR_OUT_OF_MEMORY; + } + + NS_ADDREF(stream); + + nsresult rv = stream->AdoptData(data, aStringToRead.Length()); + if (NS_FAILED(rv)) { + nsMemory::Free(data); + NS_RELEASE(stream); + return rv; + } + + *aStreamResult = stream; + return NS_OK; +} + +// Factory method to get an nsInputStream from an nsACString. Result will +// implement nsIStringInputStream and nsIRandomAccessStore +extern "C" NS_COM nsresult +NS_NewCStringInputStream(nsIInputStream** aStreamResult, + const nsACString& aStringToRead) +{ + NS_PRECONDITION(aStreamResult, "null out ptr"); + + char* data = ToNewCString(aStringToRead); + if (!data) + return NS_ERROR_OUT_OF_MEMORY; + + nsStringInputStream* stream = new nsStringInputStream(); + if (! stream) { + nsMemory::Free(data); + return NS_ERROR_OUT_OF_MEMORY; + } + + NS_ADDREF(stream); + + nsresult rv = stream->AdoptData(data, aStringToRead.Length()); + if (NS_FAILED(rv)) { + nsMemory::Free(data); + NS_RELEASE(stream); + return rv; + } + + *aStreamResult = stream; + return NS_OK; +} + +// Factory method to get an nsInputStream from a C string. Result will +// implement nsIStringInputStream and nsIRandomAccessStore +extern "C" NS_COM nsresult +NS_NewCharInputStream(nsIInputStream** aStreamResult, + const char* aStringToRead) +{ + NS_PRECONDITION(aStreamResult, "null out ptr"); + + nsStringInputStream* stream = new nsStringInputStream(); + if (! stream) + return NS_ERROR_OUT_OF_MEMORY; + + NS_ADDREF(stream); + + nsresult rv = stream->ShareData(aStringToRead, -1); + + if (NS_FAILED(rv)) { + NS_RELEASE(stream); + return rv; + } + + *aStreamResult = stream; + return NS_OK; +} + +// Factory method to get an nsInputStream from a byte array. Result will +// implement nsIStringInputStream and nsIRandomAccessStore +extern "C" NS_COM nsresult +NS_NewByteInputStream(nsIInputStream** aStreamResult, + const char* aStringToRead, + PRInt32 aLength) +{ + NS_PRECONDITION(aStreamResult, "null out ptr"); + + nsStringInputStream* stream = new nsStringInputStream(); + if (! stream) + return NS_ERROR_OUT_OF_MEMORY; + + NS_ADDREF(stream); + + nsresult rv = stream->ShareData(aStringToRead, aLength); + + if (NS_FAILED(rv)) { + NS_RELEASE(stream); + return rv; + } + + *aStreamResult = stream; + return NS_OK; +} + +// factory method for constructing a nsStringInputStream object +NS_METHOD +nsStringInputStreamConstructor(nsISupports *outer, REFNSIID iid, void **result) +{ + *result = nsnull; + + if (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; +} |