Add m-esr52 at 52.6.0

1 files changed, 452 insertions, 0 deletions

diff --git a/xpcom/io/nsStringStream.cpp b/xpcom/io/nsStringStream.cpp
new file mode 100644
index 000000000..b65242c14
--- /dev/null
+++ b/xpcom/io/nsStringStream.cpp
@@ -0,0 +1,452 @@
+/* -*- 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 "plstr.h"
+#include "nsIClassInfoImpl.h"
+#include "mozilla/Attributes.h"
+#include "mozilla/ipc/InputStreamUtils.h"
+#include "nsIIPCSerializableInputStream.h"
+
+using namespace mozilla::ipc;
+using mozilla::Maybe;
+using mozilla::Some;
+
+//-----------------------------------------------------------------------------
+// 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_NSISUPPORTSPRIMITIVE
+  NS_DECL_NSISUPPORTSCSTRING
+  NS_DECL_NSIIPCSERIALIZABLEINPUTSTREAM
+  NS_DECL_NSICLONEABLEINPUTSTREAM
+
+  nsStringInputStream()
+  {
+    Clear();
+  }
+
+  explicit nsStringInputStream(const nsStringInputStream& aOther)
+    : mOffset(aOther.mOffset)
+  {
+    // Use Assign() here because we don't want the life of the clone to be
+    // dependent on the life of the original stream.
+    mData.Assign(aOther.mData);
+  }
+
+private:
+  ~nsStringInputStream()
+  {
+  }
+
+  uint32_t Length() const
+  {
+    return mData.Length();
+  }
+
+  uint32_t LengthRemaining() const
+  {
+    return Length() - mOffset;
+  }
+
+  void Clear()
+  {
+    mData.SetIsVoid(true);
+  }
+
+  bool Closed()
+  {
+    return mData.IsVoid();
+  }
+
+  nsDependentCSubstring mData;
+  uint32_t mOffset;
+};
+
+// 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,
+                           nsIIPCSerializableInputStream,
+                           nsICloneableInputStream)
+NS_IMPL_CI_INTERFACE_GETTER(nsStringInputStream,
+                            nsIStringInputStream,
+                            nsIInputStream,
+                            nsISupportsCString,
+                            nsISeekableStream,
+                            nsICloneableInputStream)
+
+/////////
+// nsISupportsCString implementation
+/////////
+
+NS_IMETHODIMP
+nsStringInputStream::GetType(uint16_t* aType)
+{
+  *aType = TYPE_CSTRING;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsStringInputStream::GetData(nsACString& data)
+{
+  // 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;
+  }
+
+  data.Assign(mData);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsStringInputStream::SetData(const nsACString& aData)
+{
+  mData.Assign(aData);
+  mOffset = 0;
+  return NS_OK;
+}
+
+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;
+  }
+  mData.Assign(aData, aDataLen);
+  mOffset = 0;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsStringInputStream::AdoptData(char* aData, int32_t aDataLen)
+{
+  if (NS_WARN_IF(!aData)) {
+    return NS_ERROR_INVALID_ARG;
+  }
+  mData.Adopt(aData, aDataLen);
+  mOffset = 0;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsStringInputStream::ShareData(const char* aData, int32_t aDataLen)
+{
+  if (NS_WARN_IF(!aData)) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  if (aDataLen < 0) {
+    aDataLen = strlen(aData);
+  }
+
+  mData.Rebind(aData, aDataLen);
+  mOffset = 0;
+  return NS_OK;
+}
+
+NS_IMETHODIMP_(size_t)
+nsStringInputStream::SizeOfIncludingThis(MallocSizeOf aMallocSizeOf)
+{
+  size_t n = aMallocSizeOf(this);
+  n += mData.SizeOfExcludingThisIfUnshared(aMallocSizeOf);
+  return n;
+}
+
+/////////
+// nsIInputStream implementation
+/////////
+
+NS_IMETHODIMP
+nsStringInputStream::Close()
+{
+  Clear();
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsStringInputStream::Available(uint64_t* aLength)
+{
+  NS_ASSERTION(aLength, "null ptr");
+
+  if (Closed()) {
+    return NS_BASE_STREAM_CLOSED;
+  }
+
+  *aLength = LengthRemaining();
+  return 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)
+{
+  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
+  uint32_t maxCount = LengthRemaining();
+  if (maxCount == 0) {
+    *aResult = 0;
+    return NS_OK;
+  }
+
+  if (aCount > maxCount) {
+    aCount = maxCount;
+  }
+  nsresult rv = aWriter(this, aClosure, mData.BeginReading() + mOffset, 0,
+                        aCount, aResult);
+  if (NS_SUCCEEDED(rv)) {
+    NS_ASSERTION(*aResult <= aCount,
+                 "writer should not write more than we asked it to write");
+    mOffset += *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)
+{
+  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 += mOffset;
+      break;
+    case NS_SEEK_END:
+      newPos += Length();
+      break;
+    default:
+      NS_ERROR("invalid aWhence");
+      return NS_ERROR_INVALID_ARG;
+  }
+
+  if (NS_WARN_IF(newPos < 0) || NS_WARN_IF(newPos > Length())) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  mOffset = (uint32_t)newPos;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsStringInputStream::Tell(int64_t* aOutWhere)
+{
+  if (Closed()) {
+    return NS_BASE_STREAM_CLOSED;
+  }
+
+  *aOutWhere = mOffset;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsStringInputStream::SetEOF()
+{
+  if (Closed()) {
+    return NS_BASE_STREAM_CLOSED;
+  }
+
+  mOffset = Length();
+  return NS_OK;
+}
+
+/////////
+// nsIIPCSerializableInputStream implementation
+/////////
+
+void
+nsStringInputStream::Serialize(InputStreamParams& aParams,
+                               FileDescriptorArray& /* aFDs */)
+{
+  StringInputStreamParams params;
+  params.data() = PromiseFlatCString(mData);
+  aParams = params;
+}
+
+bool
+nsStringInputStream::Deserialize(const InputStreamParams& aParams,
+                                 const FileDescriptorArray& /* aFDs */)
+{
+  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;
+}
+
+Maybe<uint64_t>
+nsStringInputStream::ExpectedSerializedLength()
+{
+  return Some(static_cast<uint64_t>(Length()));
+}
+
+/////////
+// nsICloneableInputStream implementation
+/////////
+
+NS_IMETHODIMP
+nsStringInputStream::GetCloneable(bool* aCloneableOut)
+{
+  *aCloneableOut = true;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsStringInputStream::Clone(nsIInputStream** aCloneOut)
+{
+  RefPtr<nsIInputStream> ref = new nsStringInputStream(*this);
+  ref.forget(aCloneOut);
+  return NS_OK;
+}
+
+nsresult
+NS_NewByteInputStream(nsIInputStream** aStreamResult,
+                      const char* aStringToRead, int32_t aLength,
+                      nsAssignmentType aAssignment)
+{
+  NS_PRECONDITION(aStreamResult, "null out ptr");
+
+  RefPtr<nsStringInputStream> stream = new nsStringInputStream();
+
+  nsresult rv;
+  switch (aAssignment) {
+    case NS_ASSIGNMENT_COPY:
+      rv = stream->SetData(aStringToRead, aLength);
+      break;
+    case NS_ASSIGNMENT_DEPEND:
+      rv = stream->ShareData(aStringToRead, aLength);
+      break;
+    case NS_ASSIGNMENT_ADOPT:
+      rv = stream->AdoptData(const_cast<char*>(aStringToRead), aLength);
+      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_NewCStringInputStream(nsIInputStream** aStreamResult,
+                         const nsACString& aStringToRead)
+{
+  NS_PRECONDITION(aStreamResult, "null out ptr");
+
+  RefPtr<nsStringInputStream> stream = new nsStringInputStream();
+
+  stream->SetData(aStringToRead);
+
+  stream.forget(aStreamResult);
+  return NS_OK;
+}
+
+// factory method for constructing a nsStringInputStream object
+nsresult
+nsStringInputStreamConstructor(nsISupports* aOuter, REFNSIID aIID,
+                               void** aResult)
+{
+  *aResult = nullptr;
+
+  if (NS_WARN_IF(aOuter)) {
+    return NS_ERROR_NO_AGGREGATION;
+  }
+
+  RefPtr<nsStringInputStream> inst = new nsStringInputStream();
+  return inst->QueryInterface(aIID, aResult);
+}