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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 00:47:55 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 00:47:55 +0000
commit26a029d407be480d791972afb5975cf62c9360a6 (patch)
treef435a8308119effd964b339f76abb83a57c29483 /xpcom/io/nsStringStream.cpp
parentInitial commit. (diff)
downloadfirefox-26a029d407be480d791972afb5975cf62c9360a6.tar.xz
firefox-26a029d407be480d791972afb5975cf62c9360a6.zip
Adding upstream version 124.0.1.upstream/124.0.1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'xpcom/io/nsStringStream.cpp')
-rw-r--r--xpcom/io/nsStringStream.cpp591
1 files changed, 591 insertions, 0 deletions
diff --git a/xpcom/io/nsStringStream.cpp b/xpcom/io/nsStringStream.cpp
new file mode 100644
index 0000000000..b3e83a58ba
--- /dev/null
+++ b/xpcom/io/nsStringStream.cpp
@@ -0,0 +1,591 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/**
+ * Based on original code from nsIStringStream.cpp
+ */
+
+#include "ipc/IPCMessageUtils.h"
+
+#include "nsStringStream.h"
+#include "nsStreamUtils.h"
+#include "nsReadableUtils.h"
+#include "nsICloneableInputStream.h"
+#include "nsISeekableStream.h"
+#include "nsISupportsPrimitives.h"
+#include "nsCRT.h"
+#include "prerror.h"
+#include "nsIClassInfoImpl.h"
+#include "mozilla/Attributes.h"
+#include "mozilla/ipc/InputStreamUtils.h"
+#include "mozilla/Maybe.h"
+#include "mozilla/ReentrantMonitor.h"
+#include "mozilla/StreamBufferSourceImpl.h"
+#include "nsIIPCSerializableInputStream.h"
+#include "XPCOMModule.h"
+
+using namespace mozilla::ipc;
+using mozilla::fallible;
+using mozilla::MakeRefPtr;
+using mozilla::MallocSizeOf;
+using mozilla::nsBorrowedSource;
+using mozilla::nsCStringSource;
+using mozilla::nsTArraySource;
+using mozilla::ReentrantMonitorAutoEnter;
+using mozilla::Span;
+using mozilla::StreamBufferSource;
+
+//-----------------------------------------------------------------------------
+// nsIStringInputStream implementation
+//-----------------------------------------------------------------------------
+
+class nsStringInputStream final : public nsIStringInputStream,
+ public nsISeekableStream,
+ public nsISupportsCString,
+ public nsIIPCSerializableInputStream,
+ public nsICloneableInputStream {
+ public:
+ NS_DECL_THREADSAFE_ISUPPORTS
+ NS_DECL_NSIINPUTSTREAM
+ NS_DECL_NSISTRINGINPUTSTREAM
+ NS_DECL_NSISEEKABLESTREAM
+ NS_DECL_NSITELLABLESTREAM
+ NS_DECL_NSISUPPORTSPRIMITIVE
+ NS_DECL_NSISUPPORTSCSTRING
+ NS_DECL_NSIIPCSERIALIZABLEINPUTSTREAM
+ NS_DECL_NSICLONEABLEINPUTSTREAM
+
+ nsStringInputStream() = default;
+
+ nsresult Init(nsCString&& aString);
+
+ nsresult Init(nsTArray<uint8_t>&& aArray);
+
+ private:
+ ~nsStringInputStream() = default;
+
+ size_t Length() const MOZ_REQUIRES(mMon) {
+ return mSource ? mSource->Data().Length() : 0;
+ }
+
+ size_t LengthRemaining() const MOZ_REQUIRES(mMon) {
+ return Length() - mOffset;
+ }
+
+ void Clear() MOZ_REQUIRES(mMon) { mSource = nullptr; }
+
+ bool Closed() MOZ_REQUIRES(mMon) { return !mSource; }
+
+ RefPtr<StreamBufferSource> mSource MOZ_GUARDED_BY(mMon);
+ size_t mOffset MOZ_GUARDED_BY(mMon) = 0;
+
+ mutable mozilla::ReentrantMonitor mMon{"nsStringInputStream"};
+};
+
+nsresult nsStringInputStream::Init(nsCString&& aString) {
+ nsCString string;
+ if (!string.Assign(std::move(aString), fallible)) {
+ return NS_ERROR_OUT_OF_MEMORY;
+ }
+ auto source = MakeRefPtr<nsCStringSource>(std::move(string));
+ return SetDataSource(source);
+}
+
+nsresult nsStringInputStream::Init(nsTArray<uint8_t>&& aArray) {
+ auto source = MakeRefPtr<nsTArraySource>(std::move(aArray));
+ return SetDataSource(source);
+}
+
+// This class needs to support threadsafe refcounting since people often
+// allocate a string stream, and then read it from a background thread.
+NS_IMPL_ADDREF(nsStringInputStream)
+NS_IMPL_RELEASE(nsStringInputStream)
+
+NS_IMPL_CLASSINFO(nsStringInputStream, nullptr, nsIClassInfo::THREADSAFE,
+ NS_STRINGINPUTSTREAM_CID)
+NS_IMPL_QUERY_INTERFACE_CI(nsStringInputStream, nsIStringInputStream,
+ nsIInputStream, nsISupportsCString,
+ nsISeekableStream, nsITellableStream,
+ nsIIPCSerializableInputStream,
+ nsICloneableInputStream)
+NS_IMPL_CI_INTERFACE_GETTER(nsStringInputStream, nsIStringInputStream,
+ nsIInputStream, nsISupportsCString,
+ nsISeekableStream, nsITellableStream,
+ nsICloneableInputStream)
+
+/////////
+// nsISupportsCString implementation
+/////////
+
+NS_IMETHODIMP
+nsStringInputStream::GetType(uint16_t* aType) {
+ *aType = TYPE_CSTRING;
+ return NS_OK;
+}
+
+NS_IMETHODIMP
+nsStringInputStream::GetData(nsACString& data) {
+ ReentrantMonitorAutoEnter lock(mMon);
+
+ // The stream doesn't have any data when it is closed. We could fake it
+ // and return an empty string here, but it seems better to keep this return
+ // value consistent with the behavior of the other 'getter' methods.
+ if (NS_WARN_IF(Closed())) {
+ return NS_BASE_STREAM_CLOSED;
+ }
+
+ return mSource->GetData(data);
+}
+
+NS_IMETHODIMP
+nsStringInputStream::SetData(const nsACString& aData) {
+ nsCString string;
+ if (!string.Assign(aData, fallible)) {
+ return NS_ERROR_OUT_OF_MEMORY;
+ }
+ auto source = MakeRefPtr<nsCStringSource>(std::move(string));
+ return SetDataSource(source);
+}
+
+NS_IMETHODIMP
+nsStringInputStream::ToString(char** aResult) {
+ // NOTE: This method may result in data loss, so we do not implement it.
+ return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+/////////
+// nsIStringInputStream implementation
+/////////
+
+NS_IMETHODIMP
+nsStringInputStream::SetData(const char* aData, int32_t aDataLen) {
+ if (NS_WARN_IF(!aData)) {
+ return NS_ERROR_INVALID_ARG;
+ }
+
+ nsCString string;
+ if (NS_WARN_IF(!string.Assign(aData, aDataLen, fallible))) {
+ return NS_ERROR_OUT_OF_MEMORY;
+ }
+ auto source = MakeRefPtr<nsCStringSource>(std::move(string));
+ return SetDataSource(source);
+}
+
+NS_IMETHODIMP
+nsStringInputStream::SetUTF8Data(const nsACString& aData) {
+ return nsStringInputStream::SetData(aData);
+}
+
+NS_IMETHODIMP
+nsStringInputStream::AdoptData(char* aData, int32_t aDataLen) {
+ if (NS_WARN_IF(!aData)) {
+ return NS_ERROR_INVALID_ARG;
+ }
+
+ nsCString string;
+ string.Adopt(aData, aDataLen);
+ auto source = MakeRefPtr<nsCStringSource>(std::move(string));
+ return SetDataSource(source);
+}
+
+NS_IMETHODIMP
+nsStringInputStream::ShareData(const char* aData, int32_t aDataLen) {
+ if (NS_WARN_IF(!aData)) {
+ return NS_ERROR_INVALID_ARG;
+ }
+
+ size_t length = aDataLen < 0 ? strlen(aData) : size_t(aDataLen);
+ auto source = MakeRefPtr<nsBorrowedSource>(Span{aData, length});
+ return SetDataSource(source);
+}
+
+NS_IMETHODIMP
+nsStringInputStream::SetDataSource(StreamBufferSource* aSource) {
+ ReentrantMonitorAutoEnter lock(mMon);
+
+ if (NS_WARN_IF(!aSource)) {
+ return NS_ERROR_INVALID_ARG;
+ }
+
+ mSource = aSource;
+ mOffset = 0;
+ return NS_OK;
+}
+
+NS_IMETHODIMP_(size_t)
+nsStringInputStream::SizeOfIncludingThisIfUnshared(MallocSizeOf aMallocSizeOf) {
+ ReentrantMonitorAutoEnter lock(mMon);
+
+ size_t n = aMallocSizeOf(this);
+ if (mSource) {
+ n += mSource->SizeOfIncludingThisIfUnshared(aMallocSizeOf);
+ }
+ return n;
+}
+
+NS_IMETHODIMP_(size_t)
+nsStringInputStream::SizeOfIncludingThisEvenIfShared(
+ MallocSizeOf aMallocSizeOf) {
+ ReentrantMonitorAutoEnter lock(mMon);
+
+ size_t n = aMallocSizeOf(this);
+ if (mSource) {
+ n += mSource->SizeOfIncludingThisEvenIfShared(aMallocSizeOf);
+ }
+ return n;
+}
+
+/////////
+// nsIInputStream implementation
+/////////
+
+NS_IMETHODIMP
+nsStringInputStream::Close() {
+ ReentrantMonitorAutoEnter lock(mMon);
+
+ Clear();
+ return NS_OK;
+}
+
+NS_IMETHODIMP
+nsStringInputStream::Available(uint64_t* aLength) {
+ ReentrantMonitorAutoEnter lock(mMon);
+
+ NS_ASSERTION(aLength, "null ptr");
+
+ if (Closed()) {
+ return NS_BASE_STREAM_CLOSED;
+ }
+
+ *aLength = LengthRemaining();
+ return NS_OK;
+}
+
+NS_IMETHODIMP
+nsStringInputStream::StreamStatus() {
+ ReentrantMonitorAutoEnter lock(mMon);
+ return Closed() ? NS_BASE_STREAM_CLOSED : NS_OK;
+}
+
+NS_IMETHODIMP
+nsStringInputStream::Read(char* aBuf, uint32_t aCount, uint32_t* aReadCount) {
+ NS_ASSERTION(aBuf, "null ptr");
+ return ReadSegments(NS_CopySegmentToBuffer, aBuf, aCount, aReadCount);
+}
+
+NS_IMETHODIMP
+nsStringInputStream::ReadSegments(nsWriteSegmentFun aWriter, void* aClosure,
+ uint32_t aCount, uint32_t* aResult) {
+ ReentrantMonitorAutoEnter lock(mMon);
+
+ NS_ASSERTION(aResult, "null ptr");
+ NS_ASSERTION(Length() >= mOffset, "bad stream state");
+
+ if (Closed()) {
+ return NS_BASE_STREAM_CLOSED;
+ }
+
+ // We may be at end-of-file
+ size_t maxCount = LengthRemaining();
+ if (maxCount == 0) {
+ *aResult = 0;
+ return NS_OK;
+ }
+
+ if (aCount > maxCount) {
+ aCount = maxCount;
+ }
+
+ RefPtr<StreamBufferSource> source = mSource;
+ size_t offset = mOffset;
+
+ nsresult rv = aWriter(this, aClosure, source->Data().Elements() + offset, 0,
+ aCount, aResult);
+
+ if (Closed()) {
+ NS_WARNING("nsStringInputStream was closed during ReadSegments");
+ return NS_OK;
+ }
+
+ MOZ_RELEASE_ASSERT(mSource == source, "String was replaced!");
+ MOZ_RELEASE_ASSERT(mOffset == offset, "Nested read operation!");
+
+ if (NS_SUCCEEDED(rv)) {
+ NS_ASSERTION(*aResult <= aCount,
+ "writer should not write more than we asked it to write");
+ mOffset = offset + *aResult;
+ }
+
+ // errors returned from the writer end here!
+ return NS_OK;
+}
+
+NS_IMETHODIMP
+nsStringInputStream::IsNonBlocking(bool* aNonBlocking) {
+ *aNonBlocking = true;
+ return NS_OK;
+}
+
+/////////
+// nsISeekableStream implementation
+/////////
+
+NS_IMETHODIMP
+nsStringInputStream::Seek(int32_t aWhence, int64_t aOffset) {
+ ReentrantMonitorAutoEnter lock(mMon);
+
+ if (Closed()) {
+ return NS_BASE_STREAM_CLOSED;
+ }
+
+ // Compute new stream position. The given offset may be a negative value.
+
+ int64_t newPos = aOffset;
+ switch (aWhence) {
+ case NS_SEEK_SET:
+ break;
+ case NS_SEEK_CUR:
+ newPos += (int64_t)mOffset;
+ break;
+ case NS_SEEK_END:
+ newPos += (int64_t)Length();
+ break;
+ default:
+ NS_ERROR("invalid aWhence");
+ return NS_ERROR_INVALID_ARG;
+ }
+
+ if (NS_WARN_IF(newPos < 0) || NS_WARN_IF(newPos > (int64_t)Length())) {
+ return NS_ERROR_INVALID_ARG;
+ }
+
+ mOffset = (size_t)newPos;
+ return NS_OK;
+}
+
+NS_IMETHODIMP
+nsStringInputStream::SetEOF() {
+ ReentrantMonitorAutoEnter lock(mMon);
+
+ if (Closed()) {
+ return NS_BASE_STREAM_CLOSED;
+ }
+
+ mOffset = Length();
+ return NS_OK;
+}
+
+/////////
+// nsITellableStream implementation
+/////////
+
+NS_IMETHODIMP
+nsStringInputStream::Tell(int64_t* aOutWhere) {
+ ReentrantMonitorAutoEnter lock(mMon);
+
+ if (Closed()) {
+ return NS_BASE_STREAM_CLOSED;
+ }
+
+ *aOutWhere = (int64_t)mOffset;
+ return NS_OK;
+}
+
+/////////
+// nsIIPCSerializableInputStream implementation
+/////////
+
+void nsStringInputStream::SerializedComplexity(uint32_t aMaxSize,
+ uint32_t* aSizeUsed,
+ uint32_t* aPipes,
+ uint32_t* aTransferables) {
+ ReentrantMonitorAutoEnter lock(mMon);
+
+ if (Length() >= aMaxSize) {
+ *aPipes = 1;
+ } else {
+ *aSizeUsed = Length();
+ }
+}
+
+void nsStringInputStream::Serialize(InputStreamParams& aParams,
+ uint32_t aMaxSize, uint32_t* aSizeUsed) {
+ ReentrantMonitorAutoEnter lock(mMon);
+
+ MOZ_DIAGNOSTIC_ASSERT(!Closed(), "cannot send a closed stream!");
+ MOZ_ASSERT(aSizeUsed);
+ *aSizeUsed = 0;
+
+ if (Length() >= aMaxSize) {
+ // If the input stream is non-owning (i.e. it was initialized with
+ // `ShareData`), create a new owning source so that it doesn't go away while
+ // async copying.
+ if (!mSource->Owning()) {
+ auto source =
+ MakeRefPtr<nsCStringSource>(nsDependentCSubstring(mSource->Data()));
+ mSource = source;
+ }
+
+ InputStreamHelper::SerializeInputStreamAsPipe(this, aParams);
+ return;
+ }
+
+ *aSizeUsed = Length();
+
+ StringInputStreamParams params;
+ mSource->GetData(params.data());
+ aParams = params;
+}
+
+bool nsStringInputStream::Deserialize(const InputStreamParams& aParams) {
+ if (aParams.type() != InputStreamParams::TStringInputStreamParams) {
+ NS_ERROR("Received unknown parameters from the other process!");
+ return false;
+ }
+
+ const StringInputStreamParams& params = aParams.get_StringInputStreamParams();
+
+ if (NS_FAILED(SetData(params.data()))) {
+ NS_WARNING("SetData failed!");
+ return false;
+ }
+
+ return true;
+}
+
+/////////
+// nsICloneableInputStream implementation
+/////////
+
+NS_IMETHODIMP
+nsStringInputStream::GetCloneable(bool* aCloneableOut) {
+ *aCloneableOut = true;
+ return NS_OK;
+}
+
+NS_IMETHODIMP
+nsStringInputStream::Clone(nsIInputStream** aCloneOut) {
+ ReentrantMonitorAutoEnter lock(mMon);
+
+ RefPtr<nsStringInputStream> ref = new nsStringInputStream();
+ // Nothing else can access this yet, but suppress static analysis warnings
+ ReentrantMonitorAutoEnter reflock(ref->mMon);
+ if (mSource && !mSource->Owning()) {
+ auto data = mSource->Data();
+ nsresult rv = ref->SetData(data.Elements(), data.Length());
+ if (NS_WARN_IF(NS_FAILED(rv))) {
+ return rv;
+ }
+ } else {
+ ref->mSource = mSource;
+ }
+
+ // mOffset is overwritten by SetData().
+ ref->mOffset = mOffset;
+
+ ref.forget(aCloneOut);
+ return NS_OK;
+}
+
+nsresult NS_NewByteInputStream(nsIInputStream** aStreamResult,
+ mozilla::Span<const char> aStringToRead,
+ nsAssignmentType aAssignment) {
+ MOZ_ASSERT(aStreamResult, "null out ptr");
+
+ RefPtr<nsStringInputStream> stream = new nsStringInputStream();
+
+ nsresult rv;
+ switch (aAssignment) {
+ case NS_ASSIGNMENT_COPY:
+ rv = stream->SetData(aStringToRead.Elements(), aStringToRead.Length());
+ break;
+ case NS_ASSIGNMENT_DEPEND:
+ rv = stream->ShareData(aStringToRead.Elements(), aStringToRead.Length());
+ break;
+ case NS_ASSIGNMENT_ADOPT:
+ rv = stream->AdoptData(const_cast<char*>(aStringToRead.Elements()),
+ aStringToRead.Length());
+ break;
+ default:
+ NS_ERROR("invalid assignment type");
+ rv = NS_ERROR_INVALID_ARG;
+ }
+
+ if (NS_FAILED(rv)) {
+ return rv;
+ }
+
+ stream.forget(aStreamResult);
+ return NS_OK;
+}
+
+nsresult NS_NewByteInputStream(nsIInputStream** aStreamResult,
+ nsTArray<uint8_t>&& aArray) {
+ MOZ_ASSERT(aStreamResult, "null out ptr");
+
+ RefPtr<nsStringInputStream> stream = new nsStringInputStream();
+
+ nsresult rv = stream->Init(std::move(aArray));
+ if (NS_WARN_IF(NS_FAILED(rv))) {
+ return rv;
+ }
+
+ stream.forget(aStreamResult);
+ return NS_OK;
+}
+
+extern nsresult NS_NewByteInputStream(nsIInputStream** aStreamResult,
+ mozilla::StreamBufferSource* aSource) {
+ MOZ_ASSERT(aStreamResult, "null out ptr");
+
+ RefPtr<nsStringInputStream> stream = new nsStringInputStream();
+
+ nsresult rv = stream->SetDataSource(aSource);
+ if (NS_WARN_IF(NS_FAILED(rv))) {
+ return rv;
+ }
+
+ stream.forget(aStreamResult);
+ return NS_OK;
+}
+
+nsresult NS_NewCStringInputStream(nsIInputStream** aStreamResult,
+ const nsACString& aStringToRead) {
+ MOZ_ASSERT(aStreamResult, "null out ptr");
+
+ RefPtr<nsStringInputStream> stream = new nsStringInputStream();
+
+ nsresult rv = stream->SetData(aStringToRead);
+ if (NS_WARN_IF(NS_FAILED(rv))) {
+ return rv;
+ }
+
+ stream.forget(aStreamResult);
+ return NS_OK;
+}
+
+nsresult NS_NewCStringInputStream(nsIInputStream** aStreamResult,
+ nsCString&& aStringToRead) {
+ MOZ_ASSERT(aStreamResult, "null out ptr");
+
+ RefPtr<nsStringInputStream> stream = new nsStringInputStream();
+
+ nsresult rv = stream->Init(std::move(aStringToRead));
+ if (NS_WARN_IF(NS_FAILED(rv))) {
+ return rv;
+ }
+
+ stream.forget(aStreamResult);
+ return NS_OK;
+}
+
+// factory method for constructing a nsStringInputStream object
+nsresult nsStringInputStreamConstructor(REFNSIID aIID, void** aResult) {
+ *aResult = nullptr;
+
+ RefPtr<nsStringInputStream> inst = new nsStringInputStream();
+ return inst->QueryInterface(aIID, aResult);
+}