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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
commit5f8de423f190bbb79a62f804151bc24824fa32d8 (patch)
tree10027f336435511475e392454359edea8e25895d /xpcom/io/nsBinaryStream.cpp
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
Diffstat (limited to 'xpcom/io/nsBinaryStream.cpp')
-rw-r--r--xpcom/io/nsBinaryStream.cpp1016
1 files changed, 1016 insertions, 0 deletions
diff --git a/xpcom/io/nsBinaryStream.cpp b/xpcom/io/nsBinaryStream.cpp
new file mode 100644
index 000000000..82159952e
--- /dev/null
+++ b/xpcom/io/nsBinaryStream.cpp
@@ -0,0 +1,1016 @@
+/* -*- 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/. */
+
+/**
+ * This file contains implementations of the nsIBinaryInputStream and
+ * nsIBinaryOutputStream interfaces. Together, these interfaces allows reading
+ * and writing of primitive data types (integers, floating-point values,
+ * booleans, etc.) to a stream in a binary, untagged, fixed-endianness format.
+ * This might be used, for example, to implement network protocols or to
+ * produce architecture-neutral binary disk files, i.e. ones that can be read
+ * and written by both big-endian and little-endian platforms. Output is
+ * written in big-endian order (high-order byte first), as this is traditional
+ * network order.
+ *
+ * @See nsIBinaryInputStream
+ * @See nsIBinaryOutputStream
+ */
+#include <algorithm>
+#include <string.h>
+
+#include "nsBinaryStream.h"
+
+#include "mozilla/EndianUtils.h"
+#include "mozilla/PodOperations.h"
+#include "mozilla/UniquePtr.h"
+
+#include "nsCRT.h"
+#include "nsString.h"
+#include "nsISerializable.h"
+#include "nsIClassInfo.h"
+#include "nsComponentManagerUtils.h"
+#include "nsIURI.h" // for NS_IURI_IID
+#include "nsIX509Cert.h" // for NS_IX509CERT_IID
+
+#include "jsfriendapi.h"
+
+using mozilla::MakeUnique;
+using mozilla::PodCopy;
+using mozilla::UniquePtr;
+
+NS_IMPL_ISUPPORTS(nsBinaryOutputStream,
+ nsIObjectOutputStream,
+ nsIBinaryOutputStream,
+ nsIOutputStream)
+
+NS_IMETHODIMP
+nsBinaryOutputStream::Flush()
+{
+ if (NS_WARN_IF(!mOutputStream)) {
+ return NS_ERROR_UNEXPECTED;
+ }
+ return mOutputStream->Flush();
+}
+
+NS_IMETHODIMP
+nsBinaryOutputStream::Close()
+{
+ if (NS_WARN_IF(!mOutputStream)) {
+ return NS_ERROR_UNEXPECTED;
+ }
+ return mOutputStream->Close();
+}
+
+NS_IMETHODIMP
+nsBinaryOutputStream::Write(const char* aBuf, uint32_t aCount,
+ uint32_t* aActualBytes)
+{
+ if (NS_WARN_IF(!mOutputStream)) {
+ return NS_ERROR_UNEXPECTED;
+ }
+ return mOutputStream->Write(aBuf, aCount, aActualBytes);
+}
+
+NS_IMETHODIMP
+nsBinaryOutputStream::WriteFrom(nsIInputStream* aInStr, uint32_t aCount,
+ uint32_t* aResult)
+{
+ NS_NOTREACHED("WriteFrom");
+ return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+NS_IMETHODIMP
+nsBinaryOutputStream::WriteSegments(nsReadSegmentFun aReader, void* aClosure,
+ uint32_t aCount, uint32_t* aResult)
+{
+ NS_NOTREACHED("WriteSegments");
+ return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+NS_IMETHODIMP
+nsBinaryOutputStream::IsNonBlocking(bool* aNonBlocking)
+{
+ if (NS_WARN_IF(!mOutputStream)) {
+ return NS_ERROR_UNEXPECTED;
+ }
+ return mOutputStream->IsNonBlocking(aNonBlocking);
+}
+
+nsresult
+nsBinaryOutputStream::WriteFully(const char* aBuf, uint32_t aCount)
+{
+ if (NS_WARN_IF(!mOutputStream)) {
+ return NS_ERROR_UNEXPECTED;
+ }
+
+ nsresult rv;
+ uint32_t bytesWritten;
+
+ rv = mOutputStream->Write(aBuf, aCount, &bytesWritten);
+ if (NS_FAILED(rv)) {
+ return rv;
+ }
+ if (bytesWritten != aCount) {
+ return NS_ERROR_FAILURE;
+ }
+ return NS_OK;
+}
+
+NS_IMETHODIMP
+nsBinaryOutputStream::SetOutputStream(nsIOutputStream* aOutputStream)
+{
+ if (NS_WARN_IF(!aOutputStream)) {
+ return NS_ERROR_INVALID_ARG;
+ }
+ mOutputStream = aOutputStream;
+ mBufferAccess = do_QueryInterface(aOutputStream);
+ return NS_OK;
+}
+
+NS_IMETHODIMP
+nsBinaryOutputStream::WriteBoolean(bool aBoolean)
+{
+ return Write8(aBoolean);
+}
+
+NS_IMETHODIMP
+nsBinaryOutputStream::Write8(uint8_t aByte)
+{
+ return WriteFully((const char*)&aByte, sizeof(aByte));
+}
+
+NS_IMETHODIMP
+nsBinaryOutputStream::Write16(uint16_t aNum)
+{
+ aNum = mozilla::NativeEndian::swapToBigEndian(aNum);
+ return WriteFully((const char*)&aNum, sizeof(aNum));
+}
+
+NS_IMETHODIMP
+nsBinaryOutputStream::Write32(uint32_t aNum)
+{
+ aNum = mozilla::NativeEndian::swapToBigEndian(aNum);
+ return WriteFully((const char*)&aNum, sizeof(aNum));
+}
+
+NS_IMETHODIMP
+nsBinaryOutputStream::Write64(uint64_t aNum)
+{
+ nsresult rv;
+ uint32_t bytesWritten;
+
+ aNum = mozilla::NativeEndian::swapToBigEndian(aNum);
+ rv = Write(reinterpret_cast<char*>(&aNum), sizeof(aNum), &bytesWritten);
+ if (NS_FAILED(rv)) {
+ return rv;
+ }
+ if (bytesWritten != sizeof(aNum)) {
+ return NS_ERROR_FAILURE;
+ }
+ return rv;
+}
+
+NS_IMETHODIMP
+nsBinaryOutputStream::WriteFloat(float aFloat)
+{
+ NS_ASSERTION(sizeof(float) == sizeof(uint32_t),
+ "False assumption about sizeof(float)");
+ return Write32(*reinterpret_cast<uint32_t*>(&aFloat));
+}
+
+NS_IMETHODIMP
+nsBinaryOutputStream::WriteDouble(double aDouble)
+{
+ NS_ASSERTION(sizeof(double) == sizeof(uint64_t),
+ "False assumption about sizeof(double)");
+ return Write64(*reinterpret_cast<uint64_t*>(&aDouble));
+}
+
+NS_IMETHODIMP
+nsBinaryOutputStream::WriteStringZ(const char* aString)
+{
+ uint32_t length;
+ nsresult rv;
+
+ length = strlen(aString);
+ rv = Write32(length);
+ if (NS_FAILED(rv)) {
+ return rv;
+ }
+ return WriteFully(aString, length);
+}
+
+NS_IMETHODIMP
+nsBinaryOutputStream::WriteWStringZ(const char16_t* aString)
+{
+ uint32_t length, byteCount;
+ nsresult rv;
+
+ length = NS_strlen(aString);
+ rv = Write32(length);
+ if (NS_FAILED(rv)) {
+ return rv;
+ }
+
+ if (length == 0) {
+ return NS_OK;
+ }
+ byteCount = length * sizeof(char16_t);
+
+#ifdef IS_BIG_ENDIAN
+ rv = WriteBytes(reinterpret_cast<const char*>(aString), byteCount);
+#else
+ // XXX use WriteSegments here to avoid copy!
+ char16_t* copy;
+ char16_t temp[64];
+ if (length <= 64) {
+ copy = temp;
+ } else {
+ copy = reinterpret_cast<char16_t*>(malloc(byteCount));
+ if (!copy) {
+ return NS_ERROR_OUT_OF_MEMORY;
+ }
+ }
+ NS_ASSERTION((uintptr_t(aString) & 0x1) == 0, "aString not properly aligned");
+ mozilla::NativeEndian::copyAndSwapToBigEndian(copy, aString, length);
+ rv = WriteBytes(reinterpret_cast<const char*>(copy), byteCount);
+ if (copy != temp) {
+ free(copy);
+ }
+#endif
+
+ return rv;
+}
+
+NS_IMETHODIMP
+nsBinaryOutputStream::WriteUtf8Z(const char16_t* aString)
+{
+ return WriteStringZ(NS_ConvertUTF16toUTF8(aString).get());
+}
+
+NS_IMETHODIMP
+nsBinaryOutputStream::WriteBytes(const char* aString, uint32_t aLength)
+{
+ nsresult rv;
+ uint32_t bytesWritten;
+
+ rv = Write(aString, aLength, &bytesWritten);
+ if (NS_FAILED(rv)) {
+ return rv;
+ }
+ if (bytesWritten != aLength) {
+ return NS_ERROR_FAILURE;
+ }
+ return rv;
+}
+
+NS_IMETHODIMP
+nsBinaryOutputStream::WriteByteArray(uint8_t* aBytes, uint32_t aLength)
+{
+ return WriteBytes(reinterpret_cast<char*>(aBytes), aLength);
+}
+
+NS_IMETHODIMP
+nsBinaryOutputStream::WriteObject(nsISupports* aObject, bool aIsStrongRef)
+{
+ return WriteCompoundObject(aObject, NS_GET_IID(nsISupports),
+ aIsStrongRef);
+}
+
+NS_IMETHODIMP
+nsBinaryOutputStream::WriteSingleRefObject(nsISupports* aObject)
+{
+ return WriteCompoundObject(aObject, NS_GET_IID(nsISupports),
+ true);
+}
+
+NS_IMETHODIMP
+nsBinaryOutputStream::WriteCompoundObject(nsISupports* aObject,
+ const nsIID& aIID,
+ bool aIsStrongRef)
+{
+ nsCOMPtr<nsIClassInfo> classInfo = do_QueryInterface(aObject);
+ nsCOMPtr<nsISerializable> serializable = do_QueryInterface(aObject);
+
+ // Can't deal with weak refs
+ if (NS_WARN_IF(!aIsStrongRef)) {
+ return NS_ERROR_UNEXPECTED;
+ }
+ if (NS_WARN_IF(!classInfo) || NS_WARN_IF(!serializable)) {
+ return NS_ERROR_NOT_AVAILABLE;
+ }
+
+ nsCID cid;
+ nsresult rv = classInfo->GetClassIDNoAlloc(&cid);
+ if (NS_SUCCEEDED(rv)) {
+ rv = WriteID(cid);
+ } else {
+ nsCID* cidptr = nullptr;
+ rv = classInfo->GetClassID(&cidptr);
+ if (NS_WARN_IF(NS_FAILED(rv))) {
+ return rv;
+ }
+
+ rv = WriteID(*cidptr);
+
+ free(cidptr);
+ }
+
+ if (NS_WARN_IF(NS_FAILED(rv))) {
+ return rv;
+ }
+
+ rv = WriteID(aIID);
+ if (NS_WARN_IF(NS_FAILED(rv))) {
+ return rv;
+ }
+
+ return serializable->Write(this);
+}
+
+NS_IMETHODIMP
+nsBinaryOutputStream::WriteID(const nsIID& aIID)
+{
+ nsresult rv = Write32(aIID.m0);
+ if (NS_WARN_IF(NS_FAILED(rv))) {
+ return rv;
+ }
+
+ rv = Write16(aIID.m1);
+ if (NS_WARN_IF(NS_FAILED(rv))) {
+ return rv;
+ }
+
+ rv = Write16(aIID.m2);
+ if (NS_WARN_IF(NS_FAILED(rv))) {
+ return rv;
+ }
+
+ for (int i = 0; i < 8; ++i) {
+ rv = Write8(aIID.m3[i]);
+ if (NS_WARN_IF(NS_FAILED(rv))) {
+ return rv;
+ }
+ }
+
+ return NS_OK;
+}
+
+NS_IMETHODIMP_(char*)
+nsBinaryOutputStream::GetBuffer(uint32_t aLength, uint32_t aAlignMask)
+{
+ if (mBufferAccess) {
+ return mBufferAccess->GetBuffer(aLength, aAlignMask);
+ }
+ return nullptr;
+}
+
+NS_IMETHODIMP_(void)
+nsBinaryOutputStream::PutBuffer(char* aBuffer, uint32_t aLength)
+{
+ if (mBufferAccess) {
+ mBufferAccess->PutBuffer(aBuffer, aLength);
+ }
+}
+
+NS_IMPL_ISUPPORTS(nsBinaryInputStream,
+ nsIObjectInputStream,
+ nsIBinaryInputStream,
+ nsIInputStream)
+
+NS_IMETHODIMP
+nsBinaryInputStream::Available(uint64_t* aResult)
+{
+ if (NS_WARN_IF(!mInputStream)) {
+ return NS_ERROR_UNEXPECTED;
+ }
+ return mInputStream->Available(aResult);
+}
+
+NS_IMETHODIMP
+nsBinaryInputStream::Read(char* aBuffer, uint32_t aCount, uint32_t* aNumRead)
+{
+ if (NS_WARN_IF(!mInputStream)) {
+ return NS_ERROR_UNEXPECTED;
+ }
+
+ // mInputStream might give us short reads, so deal with that.
+ uint32_t totalRead = 0;
+
+ uint32_t bytesRead;
+ do {
+ nsresult rv = mInputStream->Read(aBuffer, aCount, &bytesRead);
+ if (rv == NS_BASE_STREAM_WOULD_BLOCK && totalRead != 0) {
+ // We already read some data. Return it.
+ break;
+ }
+
+ if (NS_FAILED(rv)) {
+ return rv;
+ }
+
+ totalRead += bytesRead;
+ aBuffer += bytesRead;
+ aCount -= bytesRead;
+ } while (aCount != 0 && bytesRead != 0);
+
+ *aNumRead = totalRead;
+
+ return NS_OK;
+}
+
+
+// when forwarding ReadSegments to mInputStream, we need to make sure
+// 'this' is being passed to the writer each time. To do this, we need
+// a thunking function which keeps the real input stream around.
+
+// the closure wrapper
+struct MOZ_STACK_CLASS ReadSegmentsClosure
+{
+ nsCOMPtr<nsIInputStream> mRealInputStream;
+ void* mRealClosure;
+ nsWriteSegmentFun mRealWriter;
+ nsresult mRealResult;
+ uint32_t mBytesRead; // to properly implement aToOffset
+};
+
+// the thunking function
+static nsresult
+ReadSegmentForwardingThunk(nsIInputStream* aStream,
+ void* aClosure,
+ const char* aFromSegment,
+ uint32_t aToOffset,
+ uint32_t aCount,
+ uint32_t* aWriteCount)
+{
+ ReadSegmentsClosure* thunkClosure =
+ reinterpret_cast<ReadSegmentsClosure*>(aClosure);
+
+ NS_ASSERTION(NS_SUCCEEDED(thunkClosure->mRealResult),
+ "How did this get to be a failure status?");
+
+ thunkClosure->mRealResult =
+ thunkClosure->mRealWriter(thunkClosure->mRealInputStream,
+ thunkClosure->mRealClosure,
+ aFromSegment,
+ thunkClosure->mBytesRead + aToOffset,
+ aCount, aWriteCount);
+
+ return thunkClosure->mRealResult;
+}
+
+
+NS_IMETHODIMP
+nsBinaryInputStream::ReadSegments(nsWriteSegmentFun aWriter, void* aClosure,
+ uint32_t aCount, uint32_t* aResult)
+{
+ if (NS_WARN_IF(!mInputStream)) {
+ return NS_ERROR_UNEXPECTED;
+ }
+
+ ReadSegmentsClosure thunkClosure = { this, aClosure, aWriter, NS_OK, 0 };
+
+ // mInputStream might give us short reads, so deal with that.
+ uint32_t bytesRead;
+ do {
+ nsresult rv = mInputStream->ReadSegments(ReadSegmentForwardingThunk,
+ &thunkClosure,
+ aCount, &bytesRead);
+
+ if (rv == NS_BASE_STREAM_WOULD_BLOCK && thunkClosure.mBytesRead != 0) {
+ // We already read some data. Return it.
+ break;
+ }
+
+ if (NS_FAILED(rv)) {
+ return rv;
+ }
+
+ thunkClosure.mBytesRead += bytesRead;
+ aCount -= bytesRead;
+ } while (aCount != 0 && bytesRead != 0 &&
+ NS_SUCCEEDED(thunkClosure.mRealResult));
+
+ *aResult = thunkClosure.mBytesRead;
+
+ return NS_OK;
+}
+
+NS_IMETHODIMP
+nsBinaryInputStream::IsNonBlocking(bool* aNonBlocking)
+{
+ if (NS_WARN_IF(!mInputStream)) {
+ return NS_ERROR_UNEXPECTED;
+ }
+ return mInputStream->IsNonBlocking(aNonBlocking);
+}
+
+NS_IMETHODIMP
+nsBinaryInputStream::Close()
+{
+ if (NS_WARN_IF(!mInputStream)) {
+ return NS_ERROR_UNEXPECTED;
+ }
+ return mInputStream->Close();
+}
+
+NS_IMETHODIMP
+nsBinaryInputStream::SetInputStream(nsIInputStream* aInputStream)
+{
+ if (NS_WARN_IF(!aInputStream)) {
+ return NS_ERROR_INVALID_ARG;
+ }
+ mInputStream = aInputStream;
+ mBufferAccess = do_QueryInterface(aInputStream);
+ return NS_OK;
+}
+
+NS_IMETHODIMP
+nsBinaryInputStream::ReadBoolean(bool* aBoolean)
+{
+ uint8_t byteResult;
+ nsresult rv = Read8(&byteResult);
+ if (NS_FAILED(rv)) {
+ return rv;
+ }
+ *aBoolean = !!byteResult;
+ return rv;
+}
+
+NS_IMETHODIMP
+nsBinaryInputStream::Read8(uint8_t* aByte)
+{
+ nsresult rv;
+ uint32_t bytesRead;
+
+ rv = Read(reinterpret_cast<char*>(aByte), sizeof(*aByte), &bytesRead);
+ if (NS_FAILED(rv)) {
+ return rv;
+ }
+ if (bytesRead != 1) {
+ return NS_ERROR_FAILURE;
+ }
+ return rv;
+}
+
+NS_IMETHODIMP
+nsBinaryInputStream::Read16(uint16_t* aNum)
+{
+ uint32_t bytesRead;
+ nsresult rv = Read(reinterpret_cast<char*>(aNum), sizeof(*aNum), &bytesRead);
+ if (NS_FAILED(rv)) {
+ return rv;
+ }
+ if (bytesRead != sizeof(*aNum)) {
+ return NS_ERROR_FAILURE;
+ }
+ *aNum = mozilla::NativeEndian::swapFromBigEndian(*aNum);
+ return rv;
+}
+
+NS_IMETHODIMP
+nsBinaryInputStream::Read32(uint32_t* aNum)
+{
+ uint32_t bytesRead;
+ nsresult rv = Read(reinterpret_cast<char*>(aNum), sizeof(*aNum), &bytesRead);
+ if (NS_FAILED(rv)) {
+ return rv;
+ }
+ if (bytesRead != sizeof(*aNum)) {
+ return NS_ERROR_FAILURE;
+ }
+ *aNum = mozilla::NativeEndian::swapFromBigEndian(*aNum);
+ return rv;
+}
+
+NS_IMETHODIMP
+nsBinaryInputStream::Read64(uint64_t* aNum)
+{
+ uint32_t bytesRead;
+ nsresult rv = Read(reinterpret_cast<char*>(aNum), sizeof(*aNum), &bytesRead);
+ if (NS_FAILED(rv)) {
+ return rv;
+ }
+ if (bytesRead != sizeof(*aNum)) {
+ return NS_ERROR_FAILURE;
+ }
+ *aNum = mozilla::NativeEndian::swapFromBigEndian(*aNum);
+ return rv;
+}
+
+NS_IMETHODIMP
+nsBinaryInputStream::ReadFloat(float* aFloat)
+{
+ NS_ASSERTION(sizeof(float) == sizeof(uint32_t),
+ "False assumption about sizeof(float)");
+ return Read32(reinterpret_cast<uint32_t*>(aFloat));
+}
+
+NS_IMETHODIMP
+nsBinaryInputStream::ReadDouble(double* aDouble)
+{
+ NS_ASSERTION(sizeof(double) == sizeof(uint64_t),
+ "False assumption about sizeof(double)");
+ return Read64(reinterpret_cast<uint64_t*>(aDouble));
+}
+
+static nsresult
+WriteSegmentToCString(nsIInputStream* aStream,
+ void* aClosure,
+ const char* aFromSegment,
+ uint32_t aToOffset,
+ uint32_t aCount,
+ uint32_t* aWriteCount)
+{
+ nsACString* outString = static_cast<nsACString*>(aClosure);
+
+ outString->Append(aFromSegment, aCount);
+
+ *aWriteCount = aCount;
+
+ return NS_OK;
+}
+
+NS_IMETHODIMP
+nsBinaryInputStream::ReadCString(nsACString& aString)
+{
+ nsresult rv;
+ uint32_t length, bytesRead;
+
+ rv = Read32(&length);
+ if (NS_FAILED(rv)) {
+ return rv;
+ }
+
+ aString.Truncate();
+ rv = ReadSegments(WriteSegmentToCString, &aString, length, &bytesRead);
+ if (NS_FAILED(rv)) {
+ return rv;
+ }
+
+ if (bytesRead != length) {
+ return NS_ERROR_FAILURE;
+ }
+
+ return NS_OK;
+}
+
+
+// sometimes, WriteSegmentToString will be handed an odd-number of
+// bytes, which means we only have half of the last char16_t
+struct WriteStringClosure
+{
+ char16_t* mWriteCursor;
+ bool mHasCarryoverByte;
+ char mCarryoverByte;
+};
+
+// there are a few cases we have to account for here:
+// * even length buffer, no carryover - easy, just append
+// * odd length buffer, no carryover - the last byte needs to be saved
+// for carryover
+// * odd length buffer, with carryover - first byte needs to be used
+// with the carryover byte, and
+// the rest of the even length
+// buffer is appended as normal
+// * even length buffer, with carryover - the first byte needs to be
+// used with the previous carryover byte.
+// this gives you an odd length buffer,
+// so you have to save the last byte for
+// the next carryover
+
+
+// same version of the above, but with correct casting and endian swapping
+static nsresult
+WriteSegmentToString(nsIInputStream* aStream,
+ void* aClosure,
+ const char* aFromSegment,
+ uint32_t aToOffset,
+ uint32_t aCount,
+ uint32_t* aWriteCount)
+{
+ NS_PRECONDITION(aCount > 0, "Why are we being told to write 0 bytes?");
+ NS_PRECONDITION(sizeof(char16_t) == 2, "We can't handle other sizes!");
+
+ WriteStringClosure* closure = static_cast<WriteStringClosure*>(aClosure);
+ char16_t* cursor = closure->mWriteCursor;
+
+ // we're always going to consume the whole buffer no matter what
+ // happens, so take care of that right now.. that allows us to
+ // tweak aCount later. Do NOT move this!
+ *aWriteCount = aCount;
+
+ // if the last Write had an odd-number of bytes read, then
+ if (closure->mHasCarryoverByte) {
+ // re-create the two-byte sequence we want to work with
+ char bytes[2] = { closure->mCarryoverByte, *aFromSegment };
+ *cursor = *(char16_t*)bytes;
+ // Now the little endianness dance
+ mozilla::NativeEndian::swapToBigEndianInPlace(cursor, 1);
+ ++cursor;
+
+ // now skip past the first byte of the buffer.. code from here
+ // can assume normal operations, but should not assume aCount
+ // is relative to the ORIGINAL buffer
+ ++aFromSegment;
+ --aCount;
+
+ closure->mHasCarryoverByte = false;
+ }
+
+ // this array is possibly unaligned... be careful how we access it!
+ const char16_t* unicodeSegment =
+ reinterpret_cast<const char16_t*>(aFromSegment);
+
+ // calculate number of full characters in segment (aCount could be odd!)
+ uint32_t segmentLength = aCount / sizeof(char16_t);
+
+ // copy all data into our aligned buffer. byte swap if necessary.
+ // cursor may be unaligned, so we cannot use copyAndSwapToBigEndian directly
+ memcpy(cursor, unicodeSegment, segmentLength * sizeof(char16_t));
+ char16_t* end = cursor + segmentLength;
+ mozilla::NativeEndian::swapToBigEndianInPlace(cursor, segmentLength);
+ closure->mWriteCursor = end;
+
+ // remember this is the modifed aCount and aFromSegment,
+ // so that will take into account the fact that we might have
+ // skipped the first byte in the buffer
+ if (aCount % sizeof(char16_t) != 0) {
+ // we must have had a carryover byte, that we'll need the next
+ // time around
+ closure->mCarryoverByte = aFromSegment[aCount - 1];
+ closure->mHasCarryoverByte = true;
+ }
+
+ return NS_OK;
+}
+
+
+NS_IMETHODIMP
+nsBinaryInputStream::ReadString(nsAString& aString)
+{
+ nsresult rv;
+ uint32_t length, bytesRead;
+
+ rv = Read32(&length);
+ if (NS_FAILED(rv)) {
+ return rv;
+ }
+
+ if (length == 0) {
+ aString.Truncate();
+ return NS_OK;
+ }
+
+ // pre-allocate output buffer, and get direct access to buffer...
+ if (!aString.SetLength(length, mozilla::fallible)) {
+ return NS_ERROR_OUT_OF_MEMORY;
+ }
+
+ nsAString::iterator start;
+ aString.BeginWriting(start);
+
+ WriteStringClosure closure;
+ closure.mWriteCursor = start.get();
+ closure.mHasCarryoverByte = false;
+
+ rv = ReadSegments(WriteSegmentToString, &closure,
+ length * sizeof(char16_t), &bytesRead);
+ if (NS_FAILED(rv)) {
+ return rv;
+ }
+
+ NS_ASSERTION(!closure.mHasCarryoverByte, "some strange stream corruption!");
+
+ if (bytesRead != length * sizeof(char16_t)) {
+ return NS_ERROR_FAILURE;
+ }
+
+ return NS_OK;
+}
+
+NS_IMETHODIMP
+nsBinaryInputStream::ReadBytes(uint32_t aLength, char** aResult)
+{
+ nsresult rv;
+ uint32_t bytesRead;
+ char* s;
+
+ s = reinterpret_cast<char*>(malloc(aLength));
+ if (!s) {
+ return NS_ERROR_OUT_OF_MEMORY;
+ }
+
+ rv = Read(s, aLength, &bytesRead);
+ if (NS_FAILED(rv)) {
+ free(s);
+ return rv;
+ }
+ if (bytesRead != aLength) {
+ free(s);
+ return NS_ERROR_FAILURE;
+ }
+
+ *aResult = s;
+ return NS_OK;
+}
+
+NS_IMETHODIMP
+nsBinaryInputStream::ReadByteArray(uint32_t aLength, uint8_t** aResult)
+{
+ return ReadBytes(aLength, reinterpret_cast<char**>(aResult));
+}
+
+NS_IMETHODIMP
+nsBinaryInputStream::ReadArrayBuffer(uint32_t aLength,
+ JS::Handle<JS::Value> aBuffer,
+ JSContext* aCx, uint32_t* aReadLength)
+{
+ if (!aBuffer.isObject()) {
+ return NS_ERROR_FAILURE;
+ }
+ JS::RootedObject buffer(aCx, &aBuffer.toObject());
+ if (!JS_IsArrayBufferObject(buffer)) {
+ return NS_ERROR_FAILURE;
+ }
+
+ uint32_t bufferLength = JS_GetArrayBufferByteLength(buffer);
+ if (bufferLength < aLength) {
+ return NS_ERROR_FAILURE;
+ }
+
+ uint32_t bufSize = std::min<uint32_t>(aLength, 4096);
+ UniquePtr<char[]> buf = MakeUnique<char[]>(bufSize);
+
+ uint32_t pos = 0;
+ *aReadLength = 0;
+ do {
+ // Read data into temporary buffer.
+ uint32_t bytesRead;
+ uint32_t amount = std::min(aLength - pos, bufSize);
+ nsresult rv = Read(buf.get(), amount, &bytesRead);
+ if (NS_WARN_IF(NS_FAILED(rv))) {
+ return rv;
+ }
+ MOZ_ASSERT(bytesRead <= amount);
+
+ if (bytesRead == 0) {
+ break;
+ }
+
+ // Copy data into actual buffer.
+
+ JS::AutoCheckCannotGC nogc;
+ bool isShared;
+ if (bufferLength != JS_GetArrayBufferByteLength(buffer)) {
+ return NS_ERROR_FAILURE;
+ }
+
+ char* data = reinterpret_cast<char*>(JS_GetArrayBufferData(buffer, &isShared, nogc));
+ MOZ_ASSERT(!isShared); // Implied by JS_GetArrayBufferData()
+ if (!data) {
+ return NS_ERROR_FAILURE;
+ }
+
+ *aReadLength += bytesRead;
+ PodCopy(data + pos, buf.get(), bytesRead);
+
+ pos += bytesRead;
+ } while (pos < aLength);
+
+ return NS_OK;
+}
+
+NS_IMETHODIMP
+nsBinaryInputStream::ReadObject(bool aIsStrongRef, nsISupports** aObject)
+{
+ nsCID cid;
+ nsIID iid;
+ nsresult rv = ReadID(&cid);
+ if (NS_WARN_IF(NS_FAILED(rv))) {
+ return rv;
+ }
+
+ rv = ReadID(&iid);
+ if (NS_WARN_IF(NS_FAILED(rv))) {
+ return rv;
+ }
+
+ // HACK: Intercept old (pre-gecko6) nsIURI IID, and replace with
+ // the updated IID, so that we're QI'ing to an actual interface.
+ // (As soon as we drop support for upgrading from pre-gecko6, we can
+ // remove this chunk.)
+ static const nsIID oldURIiid = {
+ 0x7a22cc0, 0xce5, 0x11d3,
+ { 0x93, 0x31, 0x0, 0x10, 0x4b, 0xa0, 0xfd, 0x40 }
+ };
+
+ // hackaround for bug 670542
+ static const nsIID oldURIiid2 = {
+ 0xd6d04c36, 0x0fa4, 0x4db3,
+ { 0xbe, 0x05, 0x4a, 0x18, 0x39, 0x71, 0x03, 0xe2 }
+ };
+
+ // hackaround for bug 682031
+ static const nsIID oldURIiid3 = {
+ 0x12120b20, 0x0929, 0x40e9,
+ { 0x88, 0xcf, 0x6e, 0x08, 0x76, 0x6e, 0x8b, 0x23 }
+ };
+
+ // hackaround for bug 1195415
+ static const nsIID oldURIiid4 = {
+ 0x395fe045, 0x7d18, 0x4adb,
+ { 0xa3, 0xfd, 0xaf, 0x98, 0xc8, 0xa1, 0xaf, 0x11 }
+ };
+
+ if (iid.Equals(oldURIiid) ||
+ iid.Equals(oldURIiid2) ||
+ iid.Equals(oldURIiid3) ||
+ iid.Equals(oldURIiid4)) {
+ const nsIID newURIiid = NS_IURI_IID;
+ iid = newURIiid;
+ }
+ // END HACK
+
+ // HACK: Service workers store resource security info on disk in the dom
+ // Cache API. When the uuid of the nsIX509Cert interface changes
+ // these serialized objects cannot be loaded any more. This hack
+ // works around this issue.
+
+ // hackaround for bug 1247580 (FF45 to FF46 transition)
+ static const nsIID oldCertIID = {
+ 0xf8ed8364, 0xced9, 0x4c6e,
+ { 0x86, 0xba, 0x48, 0xaf, 0x53, 0xc3, 0x93, 0xe6 }
+ };
+
+ if (iid.Equals(oldCertIID)) {
+ const nsIID newCertIID = NS_IX509CERT_IID;
+ iid = newCertIID;
+ }
+ // END HACK
+
+ nsCOMPtr<nsISupports> object = do_CreateInstance(cid, &rv);
+ if (NS_WARN_IF(NS_FAILED(rv))) {
+ return rv;
+ }
+
+ nsCOMPtr<nsISerializable> serializable = do_QueryInterface(object);
+ if (NS_WARN_IF(!serializable)) {
+ return NS_ERROR_UNEXPECTED;
+ }
+
+ rv = serializable->Read(this);
+ if (NS_WARN_IF(NS_FAILED(rv))) {
+ return rv;
+ }
+
+ return object->QueryInterface(iid, reinterpret_cast<void**>(aObject));
+}
+
+NS_IMETHODIMP
+nsBinaryInputStream::ReadID(nsID* aResult)
+{
+ nsresult rv = Read32(&aResult->m0);
+ if (NS_WARN_IF(NS_FAILED(rv))) {
+ return rv;
+ }
+
+ rv = Read16(&aResult->m1);
+ if (NS_WARN_IF(NS_FAILED(rv))) {
+ return rv;
+ }
+
+ rv = Read16(&aResult->m2);
+ if (NS_WARN_IF(NS_FAILED(rv))) {
+ return rv;
+ }
+
+ for (int i = 0; i < 8; ++i) {
+ rv = Read8(&aResult->m3[i]);
+ if (NS_WARN_IF(NS_FAILED(rv))) {
+ return rv;
+ }
+ }
+
+ return NS_OK;
+}
+
+NS_IMETHODIMP_(char*)
+nsBinaryInputStream::GetBuffer(uint32_t aLength, uint32_t aAlignMask)
+{
+ if (mBufferAccess) {
+ return mBufferAccess->GetBuffer(aLength, aAlignMask);
+ }
+ return nullptr;
+}
+
+NS_IMETHODIMP_(void)
+nsBinaryInputStream::PutBuffer(char* aBuffer, uint32_t aLength)
+{
+ if (mBufferAccess) {
+ mBufferAccess->PutBuffer(aBuffer, aLength);
+ }
+}