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arduino-cli/libraries/ArduinoJson_6.x/ArduinoJson/Memory/MemoryPool.hpp

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+// ArduinoJson - arduinojson.org
+// Copyright Benoit Blanchon 2014-2020
+// MIT License
+
+#pragma once
+
+#include <ArduinoJson/Memory/Alignment.hpp>
+#include <ArduinoJson/Polyfills/assert.hpp>
+#include <ArduinoJson/Polyfills/mpl/max.hpp>
+#include <ArduinoJson/Variant/VariantSlot.hpp>
+
+#include <string.h>  // memmove
+
+#define JSON_STRING_SIZE(SIZE) (SIZE + 1)
+
+namespace ARDUINOJSON_NAMESPACE {
+
+// _begin                                   _end
+// v                                           v
+// +-------------+--------------+--------------+
+// | strings...  |   (free)     |  ...variants |
+// +-------------+--------------+--------------+
+//               ^              ^
+//             _left          _right
+
+class MemoryPool {
+ public:
+  MemoryPool(char* buf, size_t capa)
+      : _begin(buf),
+        _left(buf),
+        _right(buf ? buf + capa : 0),
+        _end(buf ? buf + capa : 0),
+        _overflowed(false) {
+    ARDUINOJSON_ASSERT(isAligned(_begin));
+    ARDUINOJSON_ASSERT(isAligned(_right));
+    ARDUINOJSON_ASSERT(isAligned(_end));
+  }
+
+  void* buffer() {
+    return _begin;
+  }
+
+  // Gets the capacity of the memoryPool in bytes
+  size_t capacity() const {
+    return size_t(_end - _begin);
+  }
+
+  size_t size() const {
+    return size_t(_left - _begin + _end - _right);
+  }
+
+  bool overflowed() const {
+    return _overflowed;
+  }
+
+  VariantSlot* allocVariant() {
+    return allocRight<VariantSlot>();
+  }
+
+  template <typename TAdaptedString>
+  const char* saveString(const TAdaptedString& str) {
+    if (str.isNull())
+      return 0;
+
+#if ARDUINOJSON_ENABLE_STRING_DEDUPLICATION
+    const char* existingCopy = findString(str.begin());
+    if (existingCopy)
+      return existingCopy;
+#endif
+
+    size_t n = str.size();
+
+    char* newCopy = allocString(n + 1);
+    if (newCopy) {
+      str.copyTo(newCopy, n);
+      newCopy[n] = 0;  // force null-terminator
+    }
+    return newCopy;
+  }
+
+  void getFreeZone(char** zoneStart, size_t* zoneSize) const {
+    *zoneStart = _left;
+    *zoneSize = size_t(_right - _left);
+  }
+
+  const char* saveStringFromFreeZone(size_t len) {
+#if ARDUINOJSON_ENABLE_STRING_DEDUPLICATION
+    const char* dup = findString(_left);
+    if (dup)
+      return dup;
+#endif
+
+    const char* str = _left;
+    _left += len;
+    checkInvariants();
+    return str;
+  }
+
+  void markAsOverflowed() {
+    _overflowed = true;
+  }
+
+  void clear() {
+    _left = _begin;
+    _right = _end;
+    _overflowed = false;
+  }
+
+  bool canAlloc(size_t bytes) const {
+    return _left + bytes <= _right;
+  }
+
+  bool owns(void* p) const {
+    return _begin <= p && p < _end;
+  }
+
+  // Workaround for missing placement new
+  void* operator new(size_t, void* p) {
+    return p;
+  }
+
+  // Squash the free space between strings and variants
+  //
+  // _begin                    _end
+  // v                            v
+  // +-------------+--------------+
+  // | strings...  |  ...variants |
+  // +-------------+--------------+
+  //               ^
+  //          _left _right
+  //
+  // This funcion is called before a realloc.
+  ptrdiff_t squash() {
+    char* new_right = addPadding(_left);
+    if (new_right >= _right)
+      return 0;
+
+    size_t right_size = static_cast<size_t>(_end - _right);
+    memmove(new_right, _right, right_size);
+
+    ptrdiff_t bytes_reclaimed = _right - new_right;
+    _right = new_right;
+    _end = new_right + right_size;
+    return bytes_reclaimed;
+  }
+
+  // Move all pointers together
+  // This funcion is called after a realloc.
+  void movePointers(ptrdiff_t offset) {
+    _begin += offset;
+    _left += offset;
+    _right += offset;
+    _end += offset;
+  }
+
+ private:
+  void checkInvariants() {
+    ARDUINOJSON_ASSERT(_begin <= _left);
+    ARDUINOJSON_ASSERT(_left <= _right);
+    ARDUINOJSON_ASSERT(_right <= _end);
+    ARDUINOJSON_ASSERT(isAligned(_right));
+  }
+
+#if ARDUINOJSON_ENABLE_STRING_DEDUPLICATION
+  template <typename TIterator>
+  const char* findString(TIterator str) {
+    for (char* next = _begin; next < _left; ++next) {
+      char* begin = next;
+
+      // try to match
+      for (TIterator it = str; *it == *next; ++it) {
+        if (*next++ == 0)
+          return begin;
+      }
+
+      // jump to next terminator
+      while (*next) ++next;
+    }
+    return 0;
+  }
+#endif
+
+  char* allocString(size_t n) {
+    if (!canAlloc(n)) {
+      _overflowed = true;
+      return 0;
+    }
+    char* s = _left;
+    _left += n;
+    checkInvariants();
+    return s;
+  }
+
+  template <typename T>
+  T* allocRight() {
+    return reinterpret_cast<T*>(allocRight(sizeof(T)));
+  }
+
+  void* allocRight(size_t bytes) {
+    if (!canAlloc(bytes)) {
+      _overflowed = true;
+      return 0;
+    }
+    _right -= bytes;
+    return _right;
+  }
+
+  char *_begin, *_left, *_right, *_end;
+  bool _overflowed;
+};
+
+}  // namespace ARDUINOJSON_NAMESPACE