/*
 *
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 * modification, are permitted provided that the following conditions are
 * met:
 *
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 * notice, this list of conditions and the following disclaimer.
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 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
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 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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 */

#include <grpc++/byte_buffer.h>

namespace grpc {

ByteBuffer::ByteBuffer(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_byte_buffer_create(c_slices.data(), nslices);
}

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

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

size_t ByteBuffer::Length() {
  if (buffer_) {
    return grpc_byte_buffer_length(buffer_);
  } else {
    return 0;
  }
}

}  // namespace grpc