download_buffer.h

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#pragma once
 
#include "esphome/core/helpers.h"
#include <cstddef>
#include <cstdint>
 
namespace esphome::online_image {
 
class DownloadBuffer {
 public:
  DownloadBuffer(size_t size);
  ~DownloadBuffer() { this->allocator_.deallocate(this->buffer_, this->size_); }
 
  uint8_t *data(size_t offset = 0);
  uint8_t *append() { return this->data(this->unread_); }
 
  size_t unread() const { return this->unread_; }
  size_t size() const { return this->size_; }
  size_t free_capacity() const { return this->size_ - this->unread_; }
 
  size_t read(size_t len);
  size_t write(size_t len) {
    this->unread_ += len;
    return this->unread_;
  }
 
  void reset() { this->unread_ = 0; }
  size_t resize(size_t size);
 
 protected:
  RAMAllocator<uint8_t> allocator_{};
  uint8_t *buffer_;
  size_t size_;
  size_t unread_;
};
 
}  // namespace esphome::online_image