JsonBuffer.hpp
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// Copyright Benoit Blanchon 2014-2017
// MIT License
//
// Arduino JSON library
// https://bblanchon.github.io/ArduinoJson/
// If you like this project, please add a star!
#pragma once
#include <stddef.h> // for size_t
#include <stdint.h> // for uint8_t
#include <string.h>
#include "JsonVariant.hpp"
#include "TypeTraits/EnableIf.hpp"
#include "TypeTraits/IsArray.hpp"
#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
namespace ArduinoJson {
class JsonArray;
class JsonObject;
// Entry point for using the library.
//
// Handle the memory management (done in derived classes) and calls the parser.
// This abstract class is implemented by StaticJsonBuffer which implements a
// fixed memory allocation.
class JsonBuffer {
public:
// CAUTION: NO VIRTUAL DESTRUCTOR!
// If we add a virtual constructor the Arduino compiler will add malloc() and
// free() to the binary, adding 706 useless bytes.
// virtual ~JsonBuffer() {}
// Allocates an empty JsonArray.
//
// Returns a reference to the new JsonArray or JsonArray::invalid() if the
// allocation fails.
JsonArray &createArray();
// Allocates an empty JsonObject.
//
// Returns a reference to the new JsonObject or JsonObject::invalid() if the
// allocation fails.
JsonObject &createObject();
// Duplicates a string
//
// char* strdup(TValue);
// TValue = const std::string&, const String&,
template <typename TString>
typename TypeTraits::EnableIf<!TypeTraits::IsArray<TString>::value,
char *>::type
strdup(const TString &src) {
return Internals::StringTraits<TString>::duplicate(src, this);
}
//
// char* strdup(TValue);
// TValue = const char*, const char[N], const FlashStringHelper*
template <typename TString>
char *strdup(const TString *src) {
return Internals::StringTraits<const TString *>::duplicate(src, this);
}
// Allocates n bytes in the JsonBuffer.
// Return a pointer to the allocated memory or NULL if allocation fails.
virtual void *alloc(size_t size) = 0;
protected:
// Preserve aligment if necessary
static FORCE_INLINE size_t round_size_up(size_t bytes) {
#if ARDUINOJSON_ENABLE_ALIGNMENT
const size_t x = sizeof(void *) - 1;
return (bytes + x) & ~x;
#else
return bytes;
#endif
}
};
}
#if defined(__clang__)
#pragma clang diagnostic pop
#elif defined(__GNUC__)
#if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6)
#pragma GCC diagnostic pop
#endif
#endif