86 lines
2.4 KiB
C++
86 lines
2.4 KiB
C++
// Licensed to the Apache Software Foundation (ASF) under one
|
|
// or more contributor license agreements. See the NOTICE file
|
|
// distributed with this work for additional information
|
|
// regarding copyright ownership. The ASF licenses this file
|
|
// to you 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.
|
|
|
|
#ifndef BRPC_JSON2PB_ZERO_COPY_STREAM_READER_H
|
|
#define BRPC_JSON2PB_ZERO_COPY_STREAM_READER_H
|
|
|
|
#include <google/protobuf/io/zero_copy_stream.h> // ZeroCopyInputStream
|
|
|
|
namespace json2pb {
|
|
|
|
class ZeroCopyStreamReader {
|
|
public:
|
|
typedef char Ch;
|
|
ZeroCopyStreamReader(google::protobuf::io::ZeroCopyInputStream *stream)
|
|
: _data(NULL), _data_size(0), _nread(0), _stream(stream) {
|
|
}
|
|
//Take a charactor and return its address.
|
|
const char* PeekAddr() {
|
|
if (!ReadBlockTail()) {
|
|
return _data;
|
|
}
|
|
while (_stream->Next((const void **)&_data, &_data_size)) {
|
|
if (!ReadBlockTail()) {
|
|
return _data;
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
const char* TakeWithAddr() {
|
|
const char* c = PeekAddr();
|
|
if (c) {
|
|
++_nread;
|
|
--_data_size;
|
|
return _data++;
|
|
}
|
|
return NULL;
|
|
}
|
|
char Take() {
|
|
const char* c = PeekAddr();
|
|
if (c) {
|
|
++_nread;
|
|
--_data_size;
|
|
++_data;
|
|
return *c;
|
|
}
|
|
return '\0';
|
|
}
|
|
|
|
char Peek() {
|
|
const char* c = PeekAddr();
|
|
return (c ? *c : '\0');
|
|
}
|
|
//Tell whether read the end of this block.
|
|
bool ReadBlockTail() {
|
|
return !_data_size;
|
|
}
|
|
size_t Tell() { return _nread; }
|
|
void Put(char) {}
|
|
void Flush() {}
|
|
char *PutBegin() { return NULL; }
|
|
size_t PutEnd(char *) { return 0; }
|
|
private:
|
|
const char *_data;
|
|
int _data_size;
|
|
size_t _nread;
|
|
google::protobuf::io::ZeroCopyInputStream *_stream;
|
|
};
|
|
|
|
} // namespace json2pb
|
|
|
|
#endif //BRPC_JSON2PB_ZERO_COPY_STREAM_READER_H
|