1 files changed, 588 insertions, 0 deletions
diff --git a/ipc/chromium/src/base/pickle.cc b/ipc/chromium/src/base/pickle.cc
new file mode 100644
index 0000000000..4422ea125d
--- /dev/null
+++ b/ipc/chromium/src/base/pickle.cc
@@ -0,0 +1,588 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "base/pickle.h"
+
+#include "mozilla/Alignment.h"
+#include "mozilla/CheckedInt.h"
+#include "mozilla/EndianUtils.h"
+#include "mozilla/TypeTraits.h"
+
+#include <stdlib.h>
+
+#include <limits>
+#include <string>
+#include <algorithm>
+
+#include "nsDebug.h"
+
+//------------------------------------------------------------------------------
+
+static_assert(MOZ_ALIGNOF(Pickle::memberAlignmentType) >= MOZ_ALIGNOF(uint32_t),
+              "Insufficient alignment");
+
+static const uint32_t kHeaderSegmentCapacity = 64;
+
+static const uint32_t kDefaultSegmentCapacity = 4096;
+
+static const char kBytePaddingMarker = char(0xbf);
+
+namespace {
+
+// We want to copy data to our payload as efficiently as possible.
+// memcpy fits the bill for copying, but not all compilers or
+// architectures support inlining memcpy from void*, which has unknown
+// static alignment.  However, we know that all the members of our
+// payload will be aligned on memberAlignmentType boundaries.  We
+// therefore use that knowledge to construct a copier that will copy
+// efficiently (via standard C++ assignment mechanisms) if the datatype
+// needs that alignment or less, and memcpy otherwise.  (The compiler
+// may still inline memcpy, of course.)
+
+template<typename T, size_t size, bool hasSufficientAlignment>
+struct Copier
+{
+  static void Copy(T* dest, const char* iter) {
+    memcpy(dest, iter, sizeof(T));
+  }
+};
+
+// Copying 64-bit quantities happens often enough and can easily be made
+// worthwhile on 32-bit platforms, so handle it specially.  Only do it
+// if 64-bit types aren't sufficiently aligned; the alignment
+// requirements for them vary between 32-bit platforms.
+#ifndef HAVE_64BIT_BUILD
+template<typename T>
+struct Copier<T, sizeof(uint64_t), false>
+{
+  static void Copy(T* dest, const char* iter) {
+#if MOZ_LITTLE_ENDIAN
+    static const int loIndex = 0, hiIndex = 1;
+#else
+    static const int loIndex = 1, hiIndex = 0;
+#endif
+    static_assert(MOZ_ALIGNOF(uint32_t*) == MOZ_ALIGNOF(void*),
+                  "Pointers have different alignments");
+    const uint32_t* src = reinterpret_cast<const uint32_t*>(iter);
+    uint32_t* uint32dest = reinterpret_cast<uint32_t*>(dest);
+    uint32dest[loIndex] = src[loIndex];
+    uint32dest[hiIndex] = src[hiIndex];
+  }
+};
+#endif
+
+template<typename T, size_t size>
+struct Copier<T, size, true>
+{
+  static void Copy(T* dest, const char* iter) {
+    *dest = *reinterpret_cast<const T*>(iter);
+  }
+};
+
+} // anonymous namespace
+
+PickleIterator::PickleIterator(const Pickle& pickle)
+   : iter_(pickle.buffers_.Iter()) {
+  iter_.Advance(pickle.buffers_, pickle.header_size_);
+}
+
+template<typename T>
+void
+PickleIterator::CopyInto(T* dest) {
+  static_assert(mozilla::IsPod<T>::value, "Copied type must be a POD type");
+  Copier<T, sizeof(T), (MOZ_ALIGNOF(T) <= sizeof(Pickle::memberAlignmentType))>::Copy(dest, iter_.Data());
+}
+
+bool Pickle::IteratorHasRoomFor(const PickleIterator& iter, uint32_t len) const {
+  // Make sure we don't get into trouble where AlignInt(len) == 0.
+  MOZ_RELEASE_ASSERT(len < 64);
+
+  return iter.iter_.HasRoomFor(AlignInt(len));
+}
+
+void Pickle::UpdateIter(PickleIterator* iter, uint32_t bytes) const {
+  // Make sure we don't get into trouble where AlignInt(bytes) == 0.
+  MOZ_RELEASE_ASSERT(bytes < 64);
+
+  iter->iter_.Advance(buffers_, AlignInt(bytes));
+}
+
+// Payload is sizeof(Pickle::memberAlignmentType) aligned.
+
+Pickle::Pickle(uint32_t header_size)
+    : buffers_(AlignInt(header_size), kHeaderSegmentCapacity, kDefaultSegmentCapacity),
+      header_(nullptr),
+      header_size_(AlignInt(header_size)) {
+  DCHECK(static_cast<memberAlignmentType>(header_size) >= sizeof(Header));
+  DCHECK(header_size_ <= kHeaderSegmentCapacity);
+  header_ = reinterpret_cast<Header*>(buffers_.Start());
+  header_->payload_size = 0;
+}
+
+Pickle::Pickle(uint32_t header_size, const char* data, uint32_t length)
+    : buffers_(length, AlignCapacity(length), kDefaultSegmentCapacity),
+      header_(nullptr),
+      header_size_(AlignInt(header_size)) {
+  DCHECK(static_cast<memberAlignmentType>(header_size) >= sizeof(Header));
+  DCHECK(header_size <= kHeaderSegmentCapacity);
+  MOZ_RELEASE_ASSERT(header_size <= length);
+
+  header_ = reinterpret_cast<Header*>(buffers_.Start());
+  memcpy(header_, data, length);
+}
+
+Pickle::Pickle(Pickle&& other)
+   : buffers_(mozilla::Move(other.buffers_)),
+     header_(other.header_),
+     header_size_(other.header_size_) {
+  other.header_ = nullptr;
+}
+
+Pickle::~Pickle() {
+}
+
+Pickle& Pickle::operator=(Pickle&& other) {
+  BufferList tmp = mozilla::Move(other.buffers_);
+  other.buffers_ = mozilla::Move(buffers_);
+  buffers_ = mozilla::Move(tmp);
+
+  //std::swap(buffers_, other.buffers_);
+  std::swap(header_, other.header_);
+  std::swap(header_size_, other.header_size_);
+  return *this;
+}
+
+bool Pickle::ReadBool(PickleIterator* iter, bool* result) const {
+  DCHECK(iter);
+
+  int tmp;
+  if (!ReadInt(iter, &tmp))
+    return false;
+  DCHECK(0 == tmp || 1 == tmp);
+  *result = tmp ? true : false;
+  return true;
+}
+
+bool Pickle::ReadInt16(PickleIterator* iter, int16_t* result) const {
+  DCHECK(iter);
+
+  if (!IteratorHasRoomFor(*iter, sizeof(*result)))
+    return ReadBytesInto(iter, result, sizeof(*result));
+
+  iter->CopyInto(result);
+
+  UpdateIter(iter, sizeof(*result));
+  return true;
+}
+
+bool Pickle::ReadUInt16(PickleIterator* iter, uint16_t* result) const {
+  DCHECK(iter);
+
+  if (!IteratorHasRoomFor(*iter, sizeof(*result)))
+    return ReadBytesInto(iter, result, sizeof(*result));
+
+  iter->CopyInto(result);
+
+  UpdateIter(iter, sizeof(*result));
+  return true;
+}
+
+bool Pickle::ReadInt(PickleIterator* iter, int* result) const {
+  DCHECK(iter);
+
+  if (!IteratorHasRoomFor(*iter, sizeof(*result)))
+    return ReadBytesInto(iter, result, sizeof(*result));
+
+  iter->CopyInto(result);
+
+  UpdateIter(iter, sizeof(*result));
+  return true;
+}
+
+// Always written as a 64-bit value since the size for this type can
+// differ between architectures.
+bool Pickle::ReadLong(PickleIterator* iter, long* result) const {
+  DCHECK(iter);
+
+  int64_t big_result = 0;
+  if (IteratorHasRoomFor(*iter, sizeof(big_result))) {
+    iter->CopyInto(&big_result);
+    UpdateIter(iter, sizeof(big_result));
+  } else {
+    if (!ReadBytesInto(iter, &big_result, sizeof(big_result))) {
+      return false;
+    }
+  }
+  DCHECK(big_result <= LONG_MAX && big_result >= LONG_MIN);
+  *result = static_cast<long>(big_result);
+
+  return true;
+}
+
+// Always written as a 64-bit value since the size for this type can
+// differ between architectures.
+bool Pickle::ReadULong(PickleIterator* iter, unsigned long* result) const {
+  DCHECK(iter);
+
+  uint64_t big_result = 0;
+  if (IteratorHasRoomFor(*iter, sizeof(big_result))) {
+    iter->CopyInto(&big_result);
+    UpdateIter(iter, sizeof(big_result));
+  } else {
+    if (!ReadBytesInto(iter, &big_result, sizeof(big_result))) {
+      return false;
+    }
+  }
+  DCHECK(big_result <= ULONG_MAX);
+  *result = static_cast<unsigned long>(big_result);
+
+  return true;
+}
+
+bool Pickle::ReadLength(PickleIterator* iter, int* result) const {
+  if (!ReadInt(iter, result))
+    return false;
+  return ((*result) >= 0);
+}
+
+// Always written as a 64-bit value since the size for this type can
+// differ between architectures.
+bool Pickle::ReadSize(PickleIterator* iter, size_t* result) const {
+  DCHECK(iter);
+
+  uint64_t big_result = 0;
+  if (IteratorHasRoomFor(*iter, sizeof(big_result))) {
+    iter->CopyInto(&big_result);
+    UpdateIter(iter, sizeof(big_result));
+  } else {
+    if (!ReadBytesInto(iter, &big_result, sizeof(big_result))) {
+      return false;
+    }
+  }
+  DCHECK(big_result <= std::numeric_limits<size_t>::max());
+  *result = static_cast<size_t>(big_result);
+
+  return true;
+}
+
+bool Pickle::ReadInt32(PickleIterator* iter, int32_t* result) const {
+  DCHECK(iter);
+
+  if (!IteratorHasRoomFor(*iter, sizeof(*result)))
+    return ReadBytesInto(iter, result, sizeof(*result));
+
+  iter->CopyInto(result);
+
+  UpdateIter(iter, sizeof(*result));
+  return true;
+}
+
+bool Pickle::ReadUInt32(PickleIterator* iter, uint32_t* result) const {
+  DCHECK(iter);
+
+  if (!IteratorHasRoomFor(*iter, sizeof(*result)))
+    return ReadBytesInto(iter, result, sizeof(*result));
+
+  iter->CopyInto(result);
+
+  UpdateIter(iter, sizeof(*result));
+  return true;
+}
+
+bool Pickle::ReadInt64(PickleIterator* iter, int64_t* result) const {
+  DCHECK(iter);
+
+  if (!IteratorHasRoomFor(*iter, sizeof(*result)))
+    return ReadBytesInto(iter, result, sizeof(*result));
+
+  iter->CopyInto(result);
+
+  UpdateIter(iter, sizeof(*result));
+  return true;
+}
+
+bool Pickle::ReadUInt64(PickleIterator* iter, uint64_t* result) const {
+  DCHECK(iter);
+
+  if (!IteratorHasRoomFor(*iter, sizeof(*result)))
+    return ReadBytesInto(iter, result, sizeof(*result));
+
+  iter->CopyInto(result);
+
+  UpdateIter(iter, sizeof(*result));
+  return true;
+}
+
+bool Pickle::ReadDouble(PickleIterator* iter, double* result) const {
+  DCHECK(iter);
+
+  if (!IteratorHasRoomFor(*iter, sizeof(*result)))
+    return ReadBytesInto(iter, result, sizeof(*result));
+
+  iter->CopyInto(result);
+
+  UpdateIter(iter, sizeof(*result));
+  return true;
+}
+
+// Always written as a 64-bit value since the size for this type can
+// differ between architectures.
+bool Pickle::ReadIntPtr(PickleIterator* iter, intptr_t* result) const {
+  DCHECK(iter);
+
+  int64_t big_result = 0;
+  if (IteratorHasRoomFor(*iter, sizeof(big_result))) {
+    iter->CopyInto(&big_result);
+    UpdateIter(iter, sizeof(big_result));
+  } else {
+    if (!ReadBytesInto(iter, &big_result, sizeof(big_result))) {
+      return false;
+    }
+  }
+
+  DCHECK(big_result <= std::numeric_limits<intptr_t>::max() && big_result >= std::numeric_limits<intptr_t>::min());
+  *result = static_cast<intptr_t>(big_result);
+
+  return true;
+}
+
+bool Pickle::ReadUnsignedChar(PickleIterator* iter, unsigned char* result) const {
+  DCHECK(iter);
+
+  if (!IteratorHasRoomFor(*iter, sizeof(*result)))
+    return ReadBytesInto(iter, result, sizeof(*result));
+
+  iter->CopyInto(result);
+
+  UpdateIter(iter, sizeof(*result));
+  return true;
+}
+
+bool Pickle::ReadString(PickleIterator* iter, std::string* result) const {
+  DCHECK(iter);
+
+  int len;
+  if (!ReadLength(iter, &len))
+    return false;
+
+  auto chars = mozilla::MakeUnique<char[]>(len);
+  if (!ReadBytesInto(iter, chars.get(), len)) {
+    return false;
+  }
+  result->assign(chars.get(), len);
+
+  return true;
+}
+
+bool Pickle::ReadWString(PickleIterator* iter, std::wstring* result) const {
+  DCHECK(iter);
+
+  int len;
+  if (!ReadLength(iter, &len))
+    return false;
+  // Avoid integer multiplication overflow.
+  if (len > INT_MAX / static_cast<int>(sizeof(wchar_t)))
+    return false;
+
+  auto chars = mozilla::MakeUnique<wchar_t[]>(len);
+  if (!ReadBytesInto(iter, chars.get(), len * sizeof(wchar_t))) {
+    return false;
+  }
+  result->assign(chars.get(), len);
+
+  return true;
+}
+
+bool Pickle::ExtractBuffers(PickleIterator* iter, size_t length, BufferList* buffers,
+                            uint32_t alignment) const
+{
+  DCHECK(iter);
+  DCHECK(buffers);
+  DCHECK(alignment == 4 || alignment == 8);
+  DCHECK(intptr_t(header_) % alignment == 0);
+
+  if (AlignInt(length) < length) {
+    return false;
+  }
+
+  uint32_t padding_len = intptr_t(iter->iter_.Data()) % alignment;
+  if (!iter->iter_.AdvanceAcrossSegments(buffers_, padding_len)) {
+    return false;
+  }
+
+  bool success;
+  *buffers = const_cast<BufferList*>(&buffers_)->Extract(iter->iter_, length, &success);
+  if (!success) {
+    return false;
+  }
+
+  return iter->iter_.AdvanceAcrossSegments(buffers_, AlignInt(length) - length);
+}
+
+bool Pickle::ReadBytesInto(PickleIterator* iter, void* data, uint32_t length) const {
+  if (AlignInt(length) < length) {
+    return false;
+  }
+
+  if (!buffers_.ReadBytes(iter->iter_, reinterpret_cast<char*>(data), length)) {
+    return false;
+  }
+
+  return iter->iter_.AdvanceAcrossSegments(buffers_, AlignInt(length) - length);
+}
+
+#ifdef MOZ_PICKLE_SENTINEL_CHECKING
+bool Pickle::ReadSentinel(PickleIterator* iter, uint32_t sentinel) const {
+  uint32_t found;
+  if (!ReadUInt32(iter, &found)) {
+    return false;
+  }
+  return found == sentinel;
+}
+
+bool Pickle::WriteSentinel(uint32_t sentinel) {
+  return WriteUInt32(sentinel);
+}
+#endif
+
+void Pickle::EndRead(PickleIterator& iter) const {
+  DCHECK(iter.iter_.Done());
+}
+
+void Pickle::BeginWrite(uint32_t length, uint32_t alignment) {
+  DCHECK(alignment % 4 == 0) << "Must be at least 32-bit aligned!";
+
+  // write at an alignment-aligned offset from the beginning of the header
+  uint32_t offset = AlignInt(header_->payload_size);
+  uint32_t padding = (header_size_ + offset) % alignment;
+  uint32_t new_size = offset + padding + AlignInt(length);
+  MOZ_RELEASE_ASSERT(new_size >= header_->payload_size);
+
+  DCHECK(intptr_t(header_) % alignment == 0);
+
+#ifdef ARCH_CPU_64_BITS
+  DCHECK_LE(length, std::numeric_limits<uint32_t>::max());
+#endif
+
+  if (padding) {
+    MOZ_RELEASE_ASSERT(padding <= 8);
+    static const char padding_data[8] = {
+      kBytePaddingMarker, kBytePaddingMarker, kBytePaddingMarker, kBytePaddingMarker,
+      kBytePaddingMarker, kBytePaddingMarker, kBytePaddingMarker, kBytePaddingMarker,
+    };
+    buffers_.WriteBytes(padding_data, padding);
+  }
+
+  DCHECK((header_size_ + header_->payload_size + padding) % alignment == 0);
+
+  header_->payload_size = new_size;
+}
+
+void Pickle::EndWrite(uint32_t length) {
+  // Zero-pad to keep tools like purify from complaining about uninitialized
+  // memory.
+  uint32_t padding = AlignInt(length) - length;
+  if (padding) {
+    MOZ_RELEASE_ASSERT(padding <= 4);
+    static const char padding_data[4] = {
+      kBytePaddingMarker, kBytePaddingMarker, kBytePaddingMarker, kBytePaddingMarker,
+    };
+    buffers_.WriteBytes(padding_data, padding);
+  }
+}
+
+bool Pickle::WriteBytes(const void* data, uint32_t data_len, uint32_t alignment) {
+  DCHECK(alignment == 4 || alignment == 8);
+  DCHECK(intptr_t(header_) % alignment == 0);
+
+  BeginWrite(data_len, alignment);
+
+  buffers_.WriteBytes(reinterpret_cast<const char*>(data), data_len);
+
+  EndWrite(data_len);
+  return true;
+}
+
+bool Pickle::WriteString(const std::string& value) {
+#ifdef MOZ_FAULTY
+  std::string v(value);
+  Singleton<mozilla::ipc::Faulty>::get()->FuzzString(v);
+  if (!WriteInt(static_cast<int>(v.size())))
+    return false;
+
+  return WriteBytes(v.data(), static_cast<int>(v.size()));
+#else
+  if (!WriteInt(static_cast<int>(value.size())))
+    return false;
+
+  return WriteBytes(value.data(), static_cast<int>(value.size()));
+#endif
+}
+
+bool Pickle::WriteWString(const std::wstring& value) {
+#ifdef MOZ_FAULTY
+  std::wstring v(value);
+  Singleton<mozilla::ipc::Faulty>::get()->FuzzWString(v);
+  if (!WriteInt(static_cast<int>(v.size())))
+    return false;
+
+  return WriteBytes(v.data(),
+                    static_cast<int>(v.size() * sizeof(wchar_t)));
+#else
+  if (!WriteInt(static_cast<int>(value.size())))
+    return false;
+
+  return WriteBytes(value.data(),
+                    static_cast<int>(value.size() * sizeof(wchar_t)));
+#endif
+}
+
+bool Pickle::WriteData(const char* data, uint32_t length) {
+#ifdef MOZ_FAULTY
+  std::string v(data, length);
+  Singleton<mozilla::ipc::Faulty>::get()->FuzzData(v, v.size());
+  return WriteInt(v.size()) && WriteBytes(v.data(), v.size());
+#else
+   return WriteInt(length) && WriteBytes(data, length);
+#endif
+}
+
+void Pickle::InputBytes(const char* data, uint32_t length) {
+  buffers_.WriteBytes(data, length);
+}
+
+int32_t* Pickle::GetInt32PtrForTest(uint32_t offset) {
+  size_t pos = buffers_.Size() - offset;
+  BufferList::IterImpl iter(buffers_);
+  MOZ_RELEASE_ASSERT(iter.AdvanceAcrossSegments(buffers_, pos));
+  return reinterpret_cast<int32_t*>(iter.Data());
+}
+
+// static
+uint32_t Pickle::MessageSize(uint32_t header_size,
+                             const char* start,
+                             const char* end) {
+  DCHECK(header_size == AlignInt(header_size));
+  DCHECK(header_size <= static_cast<memberAlignmentType>(kHeaderSegmentCapacity));
+
+  if (end < start)
+    return 0;
+  size_t length = static_cast<size_t>(end - start);
+  if (length < sizeof(Header))
+    return 0;
+
+  const Header* hdr = reinterpret_cast<const Header*>(start);
+  if (length < header_size)
+    return 0;
+
+  mozilla::CheckedInt<uint32_t> sum(header_size);
+  sum += hdr->payload_size;
+
+  if (!sum.isValid())
+    return 0;
+
+  return sum.value();
+}