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 *
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 *
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 * notice, this list of conditions and the following disclaimer.
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 * in the documentation and/or other materials provided with the
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 * this software without specific prior written permission.
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#include <grpc++/support/byte_buffer.h>
#include <grpc/byte_buffer_reader.h>

namespace grpc {

ByteBuffer::ByteBuffer(const Slice* slices, size_t nslices) {
  // TODO(yangg) maybe expose some core API to simplify this
  std::vector<gpr_slice> c_slices(nslices);
  for (size_t i = 0; i < nslices; i++) {
    c_slices[i] = slices[i].slice_;
  }
  buffer_ = grpc_raw_byte_buffer_create(c_slices.data(), nslices);
}

ByteBuffer::~ByteBuffer() {
  if (buffer_) {
    grpc_byte_buffer_destroy(buffer_);
  }
}

void ByteBuffer::Clear() {
  if (buffer_) {
    grpc_byte_buffer_destroy(buffer_);
    buffer_ = nullptr;
  }
}

void ByteBuffer::Dump(std::vector<Slice>* slices) const {
  slices->clear();
  if (!buffer_) {
    return;
  }
  grpc_byte_buffer_reader reader;
  grpc_byte_buffer_reader_init(&reader, buffer_);
  gpr_slice s;
  while (grpc_byte_buffer_reader_next(&reader, &s)) {
    slices->push_back(Slice(s, Slice::STEAL_REF));
  }
  grpc_byte_buffer_reader_destroy(&reader);
}

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;
}

}  // namespace grpc