text: /*
   *
   * Copyright 2015, Google Inc.
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are
   * met:
   *
   *     * Redistributions of source code must retain the above copyright
   * notice, this list of conditions and the following disclaimer.
   *     * Redistributions in binary form must reproduce the above
   * copyright notice, this list of conditions and the following disclaimer
   * in the documentation and/or other materials provided with the
   * distribution.
   *     * Neither the name of Google Inc. nor the names of its
   * 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
   * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
   * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   *
   */
  
  #include <string.h>
  #include <malloc.h>
  
  #include <node.h>
  #include <nan.h>
  #include "grpc/grpc.h"
  #include "grpc/support/slice.h"
  
  #include "byte_buffer.h"
  
  namespace grpc {
  namespace node {
  
  using v8::Context;
  using v8::Function;
  using v8::Handle;
  using v8::Object;
  using v8::Number;
  using v8::Value;
  
  grpc_byte_buffer *BufferToByteBuffer(Handle<Value> buffer) {
    NanScope();
    int length = ::node::Buffer::Length(buffer);
    char *data = ::node::Buffer::Data(buffer);
    gpr_slice slice = gpr_slice_malloc(length);
    memcpy(GPR_SLICE_START_PTR(slice), data, length);
    grpc_byte_buffer *byte_buffer(grpc_byte_buffer_create(&slice, 1));
    gpr_slice_unref(slice);
    return byte_buffer;
  }
  
  Handle<Value> ByteBufferToBuffer(grpc_byte_buffer *buffer) {
    NanEscapableScope();
    if (buffer == NULL) {
      return NanEscapeScope(NanNull());
    }
    size_t length = grpc_byte_buffer_length(buffer);
    char *result = reinterpret_cast<char *>(calloc(length, sizeof(char)));
    size_t offset = 0;
    grpc_byte_buffer_reader *reader = grpc_byte_buffer_reader_create(buffer);
    gpr_slice next;
    while (grpc_byte_buffer_reader_next(reader, &next) != 0) {
      memcpy(result + offset, GPR_SLICE_START_PTR(next), GPR_SLICE_LENGTH(next));
      offset += GPR_SLICE_LENGTH(next);
    }
    return NanEscapeScope(MakeFastBuffer(NanNewBufferHandle(result, length)));
  }
  
  Handle<Value> MakeFastBuffer(Handle<Value> slowBuffer) {
    NanEscapableScope();
    Handle<Object> globalObj = NanGetCurrentContext()->Global();
    Handle<Function> bufferConstructor = Handle<Function>::Cast(
        globalObj->Get(NanNew("Buffer")));
    Handle<Value> consArgs[3] = {
      slowBuffer,
      NanNew<Number>(::node::Buffer::Length(slowBuffer)),
      NanNew<Number>(0)
    };
    Handle<Object> fastBuffer = bufferConstructor->NewInstance(3, consArgs);
    return NanEscapeScope(fastBuffer);
  }
  }  // namespace node
  }  // namespace grpc
  