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-rw-r--r--netwerk/base/ArrayBufferInputStream.cpp132
1 files changed, 132 insertions, 0 deletions
diff --git a/netwerk/base/ArrayBufferInputStream.cpp b/netwerk/base/ArrayBufferInputStream.cpp
new file mode 100644
index 0000000000..cd4f951f8a
--- /dev/null
+++ b/netwerk/base/ArrayBufferInputStream.cpp
@@ -0,0 +1,132 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+#include <algorithm>
+#include "ArrayBufferInputStream.h"
+#include "nsStreamUtils.h"
+#include "js/ArrayBuffer.h" // JS::{GetArrayBuffer{ByteLength,Data},IsArrayBufferObject}
+#include "js/RootingAPI.h" // JS::{Handle,Rooted}
+#include "js/Value.h" // JS::Value
+#include "mozilla/UniquePtrExtensions.h"
+#include "mozilla/dom/ScriptSettings.h"
+
+using mozilla::dom::RootingCx;
+
+NS_IMPL_ISUPPORTS(ArrayBufferInputStream, nsIArrayBufferInputStream,
+ nsIInputStream);
+
+NS_IMETHODIMP
+ArrayBufferInputStream::SetData(JS::Handle<JS::Value> aBuffer,
+ uint64_t aByteOffset, uint64_t aLength) {
+ NS_ASSERT_OWNINGTHREAD(ArrayBufferInputStream);
+
+ if (!aBuffer.isObject()) {
+ return NS_ERROR_FAILURE;
+ }
+ JS::Rooted<JSObject*> arrayBuffer(RootingCx(), &aBuffer.toObject());
+ if (!JS::IsArrayBufferObject(arrayBuffer)) {
+ return NS_ERROR_FAILURE;
+ }
+
+ uint64_t buflen = JS::GetArrayBufferByteLength(arrayBuffer);
+ uint64_t offset = std::min(buflen, aByteOffset);
+ uint64_t bufferLength = std::min(buflen - offset, aLength);
+
+ // Prevent truncation.
+ if (bufferLength > UINT32_MAX) {
+ return NS_ERROR_INVALID_ARG;
+ }
+
+ mArrayBuffer = mozilla::MakeUniqueFallible<char[]>(bufferLength);
+ if (!mArrayBuffer) {
+ return NS_ERROR_OUT_OF_MEMORY;
+ }
+
+ mBufferLength = bufferLength;
+
+ JS::AutoCheckCannotGC nogc;
+ bool isShared;
+ char* src =
+ (char*)JS::GetArrayBufferData(arrayBuffer, &isShared, nogc) + offset;
+ memcpy(&mArrayBuffer[0], src, mBufferLength);
+ return NS_OK;
+}
+
+NS_IMETHODIMP
+ArrayBufferInputStream::Close() {
+ mClosed = true;
+ return NS_OK;
+}
+
+NS_IMETHODIMP
+ArrayBufferInputStream::Available(uint64_t* aCount) {
+ if (mClosed) {
+ return NS_BASE_STREAM_CLOSED;
+ }
+ if (mArrayBuffer) {
+ *aCount = mBufferLength ? mBufferLength - mPos : 0;
+ } else {
+ *aCount = 0;
+ }
+ return NS_OK;
+}
+
+NS_IMETHODIMP
+ArrayBufferInputStream::StreamStatus() {
+ return mClosed ? NS_BASE_STREAM_CLOSED : NS_OK;
+}
+
+NS_IMETHODIMP
+ArrayBufferInputStream::Read(char* aBuf, uint32_t aCount,
+ uint32_t* aReadCount) {
+ return ReadSegments(NS_CopySegmentToBuffer, aBuf, aCount, aReadCount);
+}
+
+NS_IMETHODIMP
+ArrayBufferInputStream::ReadSegments(nsWriteSegmentFun writer, void* closure,
+ uint32_t aCount, uint32_t* result) {
+ NS_ASSERTION(result, "null ptr");
+ NS_ASSERTION(mBufferLength >= mPos, "bad stream state");
+
+ if (mClosed) {
+ return NS_BASE_STREAM_CLOSED;
+ }
+
+ MOZ_ASSERT(mArrayBuffer || (mPos == mBufferLength),
+ "stream inited incorrectly");
+
+ *result = 0;
+ while (mPos < mBufferLength) {
+ uint32_t remaining = mBufferLength - mPos;
+ MOZ_ASSERT(mArrayBuffer);
+
+ uint32_t count = std::min(aCount, remaining);
+ if (count == 0) {
+ break;
+ }
+
+ uint32_t written;
+ nsresult rv = writer(this, closure, &mArrayBuffer[0] + mPos, *result, count,
+ &written);
+ if (NS_FAILED(rv)) {
+ // InputStreams do not propagate errors to caller.
+ return NS_OK;
+ }
+
+ NS_ASSERTION(written <= count,
+ "writer should not write more than we asked it to write");
+ mPos += written;
+ *result += written;
+ aCount -= written;
+ }
+
+ return NS_OK;
+}
+
+NS_IMETHODIMP
+ArrayBufferInputStream::IsNonBlocking(bool* aNonBlocking) {
+ *aNonBlocking = true;
+ return NS_OK;
+}