| /* |
| * |
| * 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 "src/cpp/proto/proto_utils.h" |
| #include <grpc++/config.h> |
| |
| #include <grpc/grpc.h> |
| #include <grpc/byte_buffer.h> |
| #include <grpc/support/slice.h> |
| #include <grpc/support/slice_buffer.h> |
| #include <grpc/support/port_platform.h> |
| #include <google/protobuf/io/zero_copy_stream.h> |
| |
| const int kMaxBufferLength = 8192; |
| |
| class GrpcBufferWriter GRPC_FINAL |
| : public ::google::protobuf::io::ZeroCopyOutputStream { |
| public: |
| explicit GrpcBufferWriter(grpc_byte_buffer **bp, |
| int block_size = kMaxBufferLength) |
| : block_size_(block_size), byte_count_(0), have_backup_(false) { |
| *bp = grpc_byte_buffer_create(NULL, 0); |
| slice_buffer_ = &(*bp)->data.slice_buffer; |
| } |
| |
| ~GrpcBufferWriter() GRPC_OVERRIDE { |
| if (have_backup_) { |
| gpr_slice_unref(backup_slice_); |
| } |
| } |
| |
| bool Next(void **data, int *size) GRPC_OVERRIDE { |
| if (have_backup_) { |
| slice_ = backup_slice_; |
| have_backup_ = false; |
| } else { |
| slice_ = gpr_slice_malloc(block_size_); |
| } |
| *data = GPR_SLICE_START_PTR(slice_); |
| byte_count_ += *size = GPR_SLICE_LENGTH(slice_); |
| gpr_slice_buffer_add(slice_buffer_, slice_); |
| return true; |
| } |
| |
| void BackUp(int count) GRPC_OVERRIDE { |
| gpr_slice_buffer_pop(slice_buffer_); |
| if (count == block_size_) { |
| backup_slice_ = slice_; |
| } else { |
| backup_slice_ = |
| gpr_slice_split_tail(&slice_, GPR_SLICE_LENGTH(slice_) - count); |
| gpr_slice_buffer_add(slice_buffer_, slice_); |
| } |
| have_backup_ = true; |
| byte_count_ -= count; |
| } |
| |
| gpr_int64 ByteCount() const GRPC_OVERRIDE { return byte_count_; } |
| |
| private: |
| const int block_size_; |
| gpr_int64 byte_count_; |
| gpr_slice_buffer *slice_buffer_; |
| bool have_backup_; |
| gpr_slice backup_slice_; |
| gpr_slice slice_; |
| }; |
| |
| class GrpcBufferReader GRPC_FINAL |
| : public ::google::protobuf::io::ZeroCopyInputStream { |
| public: |
| explicit GrpcBufferReader(grpc_byte_buffer *buffer) |
| : byte_count_(0), backup_count_(0) { |
| reader_ = grpc_byte_buffer_reader_create(buffer); |
| } |
| ~GrpcBufferReader() GRPC_OVERRIDE { |
| grpc_byte_buffer_reader_destroy(reader_); |
| } |
| |
| bool Next(const void **data, int *size) GRPC_OVERRIDE { |
| if (backup_count_ > 0) { |
| *data = GPR_SLICE_START_PTR(slice_) + GPR_SLICE_LENGTH(slice_) - |
| backup_count_; |
| *size = backup_count_; |
| backup_count_ = 0; |
| return true; |
| } |
| if (!grpc_byte_buffer_reader_next(reader_, &slice_)) { |
| return false; |
| } |
| gpr_slice_unref(slice_); |
| *data = GPR_SLICE_START_PTR(slice_); |
| byte_count_ += *size = GPR_SLICE_LENGTH(slice_); |
| return true; |
| } |
| |
| void BackUp(int count) GRPC_OVERRIDE { |
| backup_count_ = count; |
| } |
| |
| bool Skip(int count) GRPC_OVERRIDE { |
| const void *data; |
| int size; |
| while (Next(&data, &size)) { |
| if (size >= count) { |
| BackUp(size - count); |
| return true; |
| } |
| // size < count; |
| count -= size; |
| } |
| // error or we have too large count; |
| return false; |
| } |
| |
| gpr_int64 ByteCount() const GRPC_OVERRIDE { |
| return byte_count_ - backup_count_; |
| } |
| |
| private: |
| gpr_int64 byte_count_; |
| gpr_int64 backup_count_; |
| grpc_byte_buffer_reader *reader_; |
| gpr_slice slice_; |
| }; |
| |
| namespace grpc { |
| |
| bool SerializeProto(const grpc::protobuf::Message &msg, grpc_byte_buffer **bp) { |
| GrpcBufferWriter writer(bp); |
| return msg.SerializeToZeroCopyStream(&writer); |
| } |
| |
| bool DeserializeProto(grpc_byte_buffer *buffer, grpc::protobuf::Message *msg) { |
| GrpcBufferReader reader(buffer); |
| return msg->ParseFromZeroCopyStream(&reader); |
| } |
| |
| } // namespace grpc |