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/*
*
* Copyright 2015 gRPC authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#include <grpc++/support/byte_buffer.h>
#include <grpc/byte_buffer_reader.h>
namespace grpc {
ByteBuffer::ByteBuffer(const Slice* slices, size_t nslices) {
// The following assertions check that the representation of a grpc::Slice is
// identical to that of a grpc_slice: it has a grpc_slice field, and nothing
// else.
static_assert(std::is_same<decltype(slices[0].slice_), grpc_slice>::value,
"Slice must have same representation as grpc_slice");
static_assert(sizeof(Slice) == sizeof(grpc_slice),
"Slice must have same representation as grpc_slice");
// The const_cast is legal if grpc_raw_byte_buffer_create() does no more
// than its advertised side effect of increasing the reference count of the
// slices it processes, and such an increase does not affect the semantics
// seen by the caller of this constructor.
buffer_ = grpc_raw_byte_buffer_create(
reinterpret_cast<grpc_slice*>(const_cast<Slice*>(slices)), nslices);
}
ByteBuffer::~ByteBuffer() {
if (buffer_) {
grpc_byte_buffer_destroy(buffer_);
}
}
void ByteBuffer::Clear() {
if (buffer_) {
grpc_byte_buffer_destroy(buffer_);
buffer_ = nullptr;
}
}
Status ByteBuffer::Dump(std::vector<Slice>* slices) const {
slices->clear();
if (!buffer_) {
return Status(StatusCode::FAILED_PRECONDITION, "Buffer not initialized");
}
grpc_byte_buffer_reader reader;
if (!grpc_byte_buffer_reader_init(&reader, buffer_)) {
return Status(StatusCode::INTERNAL,
"Couldn't initialize byte buffer reader");
}
grpc_slice s;
while (grpc_byte_buffer_reader_next(&reader, &s)) {
slices->push_back(Slice(s, Slice::STEAL_REF));
}
grpc_byte_buffer_reader_destroy(&reader);
return Status::OK;
}
size_t ByteBuffer::Length() const {
if (buffer_) {
return grpc_byte_buffer_length(buffer_);
} else {
return 0;
}
}
ByteBuffer::ByteBuffer(const ByteBuffer& buf)
: buffer_(grpc_byte_buffer_copy(buf.buffer_)) {}
ByteBuffer& ByteBuffer::operator=(const ByteBuffer& buf) {
Clear(); // first remove existing data
if (buf.buffer_) {
buffer_ = grpc_byte_buffer_copy(buf.buffer_); // then copy
}
return *this;
}
void ByteBuffer::Swap(ByteBuffer* other) {
grpc_byte_buffer* tmp = other->buffer_;
other->buffer_ = buffer_;
buffer_ = tmp;
}
} // namespace grpc
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