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// Copyright 2016 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 "mojo/public/cpp/bindings/lib/message_buffer.h"
#include <limits>
#include "mojo/public/cpp/bindings/lib/serialization_util.h"
namespace mojo {
namespace internal {
MessageBuffer::MessageBuffer(size_t capacity, bool zero_initialized) {
DCHECK_LE(capacity, std::numeric_limits<uint32_t>::max());
data_num_bytes_ = static_cast<uint32_t>(capacity);
MojoResult rv = AllocMessage(capacity, nullptr, 0,
MOJO_ALLOC_MESSAGE_FLAG_NONE, &message_);
CHECK_EQ(rv, MOJO_RESULT_OK);
if (capacity == 0) {
buffer_ = nullptr;
} else {
rv = GetMessageBuffer(message_.get(), &buffer_);
CHECK_EQ(rv, MOJO_RESULT_OK);
if (zero_initialized)
memset(buffer_, 0, capacity);
}
}
MessageBuffer::MessageBuffer(ScopedMessageHandle message, uint32_t num_bytes) {
message_ = std::move(message);
data_num_bytes_ = num_bytes;
if (num_bytes == 0) {
buffer_ = nullptr;
} else {
MojoResult rv = GetMessageBuffer(message_.get(), &buffer_);
CHECK_EQ(rv, MOJO_RESULT_OK);
}
}
MessageBuffer::~MessageBuffer() {}
void* MessageBuffer::Allocate(size_t delta) {
delta = internal::Align(delta);
DCHECK_LE(delta, static_cast<size_t>(data_num_bytes_));
DCHECK_GT(bytes_claimed_ + static_cast<uint32_t>(delta), bytes_claimed_);
uint32_t new_bytes_claimed = bytes_claimed_ + static_cast<uint32_t>(delta);
if (new_bytes_claimed > data_num_bytes_) {
NOTREACHED();
return nullptr;
}
char* start = static_cast<char*>(buffer_) + bytes_claimed_;
bytes_claimed_ = new_bytes_claimed;
return static_cast<void*>(start);
}
void MessageBuffer::NotifyBadMessage(const std::string& error) {
DCHECK(message_.is_valid());
MojoResult result = mojo::NotifyBadMessage(message_.get(), error);
DCHECK_EQ(result, MOJO_RESULT_OK);
}
} // namespace internal
} // namespace mojo
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