зеркало из https://github.com/mozilla/gecko-dev.git
Bug 638031 Allow string streams to share their string buffer r=bsmedberg f=bz
This commit is contained in:
Neil Rashbrook
Родитель
a94e57306e
Коммит
6ac5d55d53
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@ -84,38 +84,36 @@ public:
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NS_DECL_NSIIPCSERIALIZABLE
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nsStringInputStream()
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: mData(nsnull)
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, mOffset(0)
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, mLength(0)
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, mOwned(false)
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{}
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{
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Clear();
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}
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private:
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~nsStringInputStream()
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{}
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PRUint32 Length() const
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{
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if (mData)
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Clear();
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return mData.Length();
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}
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PRInt32 LengthRemaining() const
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PRUint32 LengthRemaining() const
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{
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return mLength - mOffset;
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return Length() - mOffset;
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}
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void Clear()
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{
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NS_ASSERTION(mData || !mOwned, "bad state");
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if (mOwned)
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NS_Free(const_cast<char*>(mData));
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// We're about to get a new string; reset the offset.
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mOffset = 0;
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mData.SetIsVoid(true);
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}
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const char* mData;
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PRUint32 mOffset;
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PRUint32 mLength;
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bool mOwned;
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bool Closed()
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{
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return mData.IsVoid();
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}
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nsDependentCSubstring mData;
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PRUint32 mOffset;
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};
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// This class needs to support threadsafe refcounting since people often
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@ -155,18 +153,18 @@ nsStringInputStream::GetData(nsACString &data)
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// The stream doesn't have any data when it is closed. We could fake it
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// and return an empty string here, but it seems better to keep this return
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// value consistent with the behavior of the other 'getter' methods.
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NS_ENSURE_TRUE(mData, NS_BASE_STREAM_CLOSED);
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NS_ENSURE_TRUE(!Closed(), NS_BASE_STREAM_CLOSED);
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data.Assign(mData, mLength);
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data.Assign(mData);
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return NS_OK;
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}
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NS_IMETHODIMP
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nsStringInputStream::SetData(const nsACString &data)
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{
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nsACString::const_iterator iter;
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data.BeginReading(iter);
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return SetData(iter.get(), iter.size_forward());
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mData.Assign(data);
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mOffset = 0;
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return NS_OK;
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}
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NS_IMETHODIMP
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@ -184,34 +182,17 @@ NS_IMETHODIMP
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nsStringInputStream::SetData(const char *data, PRInt32 dataLen)
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{
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NS_ENSURE_ARG_POINTER(data);
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if (dataLen < 0)
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dataLen = strlen(data);
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// NOTE: We do not use nsCRT::strndup here because that does not handle
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// null bytes in the middle of the given data.
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char *copy = static_cast<char *>(NS_Alloc(dataLen));
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if (!copy)
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return NS_ERROR_OUT_OF_MEMORY;
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memcpy(copy, data, dataLen);
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return AdoptData(copy, dataLen);
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mData.Assign(data, dataLen);
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mOffset = 0;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsStringInputStream::AdoptData(char *data, PRInt32 dataLen)
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{
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NS_ENSURE_ARG_POINTER(data);
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if (dataLen < 0)
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dataLen = strlen(data);
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Clear();
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mData = data;
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mLength = dataLen;
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mOwned = true;
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mData.Adopt(data, dataLen);
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mOffset = 0;
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return NS_OK;
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}
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@ -223,11 +204,8 @@ nsStringInputStream::ShareData(const char *data, PRInt32 dataLen)
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if (dataLen < 0)
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dataLen = strlen(data);
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Clear();
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mData = data;
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mLength = dataLen;
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mOwned = false;
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mData.Rebind(data, data + dataLen);
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mOffset = 0;
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return NS_OK;
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}
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@ -239,9 +217,6 @@ NS_IMETHODIMP
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nsStringInputStream::Close()
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{
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Clear();
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mData = nsnull;
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mLength = 0;
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mOwned = false;
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return NS_OK;
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}
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@ -250,7 +225,7 @@ nsStringInputStream::Available(PRUint32 *aLength)
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{
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NS_ASSERTION(aLength, "null ptr");
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if (!mData)
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if (Closed())
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return NS_BASE_STREAM_CLOSED;
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*aLength = LengthRemaining();
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@ -269,7 +244,10 @@ nsStringInputStream::ReadSegments(nsWriteSegmentFun writer, void *closure,
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PRUint32 aCount, PRUint32 *result)
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{
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NS_ASSERTION(result, "null ptr");
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NS_ASSERTION(mLength >= mOffset, "bad stream state");
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NS_ASSERTION(Length() >= mOffset, "bad stream state");
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if (Closed())
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return NS_BASE_STREAM_CLOSED;
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// We may be at end-of-file
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PRUint32 maxCount = LengthRemaining();
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@ -277,11 +255,10 @@ nsStringInputStream::ReadSegments(nsWriteSegmentFun writer, void *closure,
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*result = 0;
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return NS_OK;
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}
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NS_ASSERTION(mData, "must have data if maxCount != 0");
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if (aCount > maxCount)
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aCount = maxCount;
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nsresult rv = writer(this, closure, mData + mOffset, 0, aCount, result);
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nsresult rv = writer(this, closure, mData.BeginReading() + mOffset, 0, aCount, result);
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if (NS_SUCCEEDED(rv)) {
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NS_ASSERTION(*result <= aCount,
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"writer should not write more than we asked it to write");
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@ -306,7 +283,7 @@ nsStringInputStream::IsNonBlocking(bool *aNonBlocking)
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NS_IMETHODIMP
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nsStringInputStream::Seek(PRInt32 whence, PRInt64 offset)
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{
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if (!mData)
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if (Closed())
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return NS_BASE_STREAM_CLOSED;
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// Compute new stream position. The given offset may be a negative value.
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@ -316,29 +293,27 @@ nsStringInputStream::Seek(PRInt32 whence, PRInt64 offset)
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case NS_SEEK_SET:
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break;
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case NS_SEEK_CUR:
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newPos += (PRInt32) mOffset;
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newPos += mOffset;
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break;
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case NS_SEEK_END:
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newPos += (PRInt32) mLength;
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newPos += Length();
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break;
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default:
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NS_ERROR("invalid whence");
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return NS_ERROR_INVALID_ARG;
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}
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// mLength is never larger than PR_INT32_MAX due to the way it is assigned.
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NS_ENSURE_ARG(newPos >= 0);
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NS_ENSURE_ARG(newPos <= (PRInt32) mLength);
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NS_ENSURE_ARG(newPos <= Length());
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mOffset = (PRInt32) newPos;
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mOffset = (PRUint32)newPos;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsStringInputStream::Tell(PRInt64* outWhere)
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{
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if (!mData)
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if (Closed())
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return NS_BASE_STREAM_CLOSED;
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*outWhere = mOffset;
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@ -348,10 +323,10 @@ nsStringInputStream::Tell(PRInt64* outWhere)
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NS_IMETHODIMP
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nsStringInputStream::SetEOF()
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{
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if (!mData)
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if (Closed())
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return NS_BASE_STREAM_CLOSED;
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mLength = mOffset;
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mOffset = Length();
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return NS_OK;
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}
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@ -364,12 +339,12 @@ nsStringInputStream::Read(const IPC::Message *aMsg, void **aIter)
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{
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using IPC::ReadParam;
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nsCAutoString value;
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nsCString value;
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if (!ReadParam(aMsg, aIter, &value))
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return false;
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nsresult rv = SetData(value.get(), value.Length());
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nsresult rv = SetData(value);
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if (NS_FAILED(rv))
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return false;
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@ -381,10 +356,7 @@ nsStringInputStream::Write(IPC::Message *aMsg)
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{
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using IPC::WriteParam;
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nsCAutoString value;
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GetData(value);
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WriteParam(aMsg, value);
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WriteParam(aMsg, static_cast<const nsCString&>(PromiseFlatCString(mData)));
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}
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nsresult
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@ -429,27 +401,26 @@ nsresult
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NS_NewStringInputStream(nsIInputStream** aStreamResult,
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const nsAString& aStringToRead)
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{
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char* data = ToNewCString(aStringToRead); // truncates high-order bytes
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if (!data)
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return NS_ERROR_OUT_OF_MEMORY;
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nsresult rv = NS_NewByteInputStream(aStreamResult, data,
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aStringToRead.Length(),
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NS_ASSIGNMENT_ADOPT);
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if (NS_FAILED(rv))
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NS_Free(data);
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return rv;
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NS_LossyConvertUTF16toASCII data(aStringToRead); // truncates high-order bytes
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return NS_NewCStringInputStream(aStreamResult, data);
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}
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nsresult
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NS_NewCStringInputStream(nsIInputStream** aStreamResult,
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const nsACString& aStringToRead)
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{
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nsACString::const_iterator data;
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aStringToRead.BeginReading(data);
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NS_PRECONDITION(aStreamResult, "null out ptr");
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return NS_NewByteInputStream(aStreamResult, data.get(), data.size_forward(),
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NS_ASSIGNMENT_COPY);
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nsStringInputStream* stream = new nsStringInputStream();
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if (! stream)
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return NS_ERROR_OUT_OF_MEMORY;
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NS_ADDREF(stream);
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stream->SetData(aStringToRead);
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*aStreamResult = stream;
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return NS_OK;
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}
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// factory method for constructing a nsStringInputStream object
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