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// ArduinoJson - arduinojson.org
// Copyright Benoit Blanchon 2014-2018
// MIT License
#pragma once
#include "JsonBufferBase.hpp"
namespace ArduinoJson {
namespace Internals {
class StaticJsonBufferBase : public JsonBufferBase<StaticJsonBufferBase> {
public:
class String {
public:
String(StaticJsonBufferBase* parent) : _parent(parent) {
_start = parent->_buffer + parent->_size;
}
void append(char c) {
if (_parent->canAlloc(1)) {
char* last = static_cast<char*>(_parent->doAlloc(1));
*last = c;
}
}
const char* c_str() const {
if (_parent->canAlloc(1)) {
char* last = static_cast<char*>(_parent->doAlloc(1));
*last = '\0';
return _start;
} else {
return NULL;
}
}
private:
StaticJsonBufferBase* _parent;
char* _start;
};
StaticJsonBufferBase(char* buffer, size_t capa)
: _buffer(buffer), _capacity(capa), _size(0) {}
// Gets the capacity of the buffer in bytes
size_t capacity() const {
return _capacity;
}
// Gets the current usage of the buffer in bytes
size_t size() const {
return _size;
}
// Allocates the specified amount of bytes in the buffer
virtual void* alloc(size_t bytes) {
alignNextAlloc();
if (!canAlloc(bytes)) return NULL;
return doAlloc(bytes);
}
// Resets the buffer.
// USE WITH CAUTION: this invalidates all previously allocated data
void clear() {
_size = 0;
}
String startString() {
return String(this);
}
protected:
~StaticJsonBufferBase() {}
private:
void alignNextAlloc() {
_size = round_size_up(_size);
}
bool canAlloc(size_t bytes) const {
return _size + bytes <= _capacity;
}
void* doAlloc(size_t bytes) {
void* p = &_buffer[_size];
_size += bytes;
return p;
}
char* _buffer;
size_t _capacity;
size_t _size;
};
}
#if defined(__clang__)
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wnon-virtual-dtor"
#elif defined(__GNUC__)
#if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6)
#pragma GCC diagnostic push
#endif
#pragma GCC diagnostic ignored "-Wnon-virtual-dtor"
#endif
// Implements a JsonBuffer with fixed memory allocation.
// The template paramenter CAPACITY specifies the capacity of the buffer in
// bytes.
template <size_t CAPACITY>
class StaticJsonBuffer : public Internals::StaticJsonBufferBase {
public:
explicit StaticJsonBuffer()
: Internals::StaticJsonBufferBase(_buffer, CAPACITY) {}
private:
char _buffer[CAPACITY];
};
}
#if defined(__clang__)
#pragma clang diagnostic pop
#elif defined(__GNUC__)
#if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6)
#pragma GCC diagnostic pop
#endif
#endif
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