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// Copyright 2019 Google LLC
//
// Licensed 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
//
// https://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 dap_string_buffer_h
#define dap_string_buffer_h
#include "dap/io.h"
#include <algorithm> // std::min
#include <cstring> // memcpy
#include <memory> // std::unique_ptr
#include <string>
namespace dap {
class StringBuffer : public virtual Reader, public virtual Writer {
public:
static inline std::unique_ptr<StringBuffer> create();
inline bool write(const std::string& s);
inline std::string string() const;
// Reader / Writer compilance
inline bool isOpen() override;
inline void close() override;
inline size_t read(void* buffer, size_t bytes) override;
inline bool write(const void* buffer, size_t bytes) override;
private:
std::string str;
bool closed = false;
};
bool StringBuffer::isOpen() {
return !closed;
}
void StringBuffer::close() {
closed = true;
}
std::unique_ptr<StringBuffer> StringBuffer::create() {
return std::unique_ptr<StringBuffer>(new StringBuffer());
}
bool StringBuffer::write(const std::string& s) {
return write(s.data(), s.size());
}
std::string StringBuffer::string() const {
return str;
}
size_t StringBuffer::read(void* buffer, size_t bytes) {
if (closed || bytes == 0 || str.size() == 0) {
return 0;
}
auto len = std::min(bytes, str.size());
memcpy(buffer, str.data(), len);
str = std::string(str.begin() + len, str.end());
return len;
}
bool StringBuffer::write(const void* buffer, size_t bytes) {
if (closed) {
return false;
}
auto chars = reinterpret_cast<const char*>(buffer);
str.append(chars, chars + bytes);
return true;
}
} // namespace dap
#endif // dap_string_buffer_h
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