NVS: expose C++ API

Closes https://github.com/espressif/esp-idf/issues/3540

components/nvs_flash/src/nvs_handle_simple.cpp

@@ -0,0 +1,133 @@
+// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
+//
+// 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
+
+//     http://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.
+#include <cstdlib>
+#include "nvs_handle.hpp"
+#include "nvs_partition_manager.hpp"
+
+namespace nvs {
+
+NVSHandleSimple::~NVSHandleSimple() {
+    NVSPartitionManager::get_instance()->close_handle(this);
+}
+
+esp_err_t NVSHandleSimple::set_typed_item(ItemType datatype, const char *key, const void* data, size_t dataSize)
+{
+    if (!valid) return ESP_ERR_NVS_INVALID_HANDLE;
+    if (mReadOnly) return ESP_ERR_NVS_READ_ONLY;
+
+    return mStoragePtr->writeItem(mNsIndex, datatype, key, data, dataSize);
+}
+
+esp_err_t NVSHandleSimple::get_typed_item(ItemType datatype, const char *key, void* data, size_t dataSize)
+{
+    if (!valid) return ESP_ERR_NVS_INVALID_HANDLE;
+
+    return mStoragePtr->readItem(mNsIndex, datatype, key, data, dataSize);
+}
+
+esp_err_t NVSHandleSimple::set_string(const char *key, const char* str)
+{
+    if (!valid) return ESP_ERR_NVS_INVALID_HANDLE;
+    if (mReadOnly) return ESP_ERR_NVS_READ_ONLY;
+
+    return mStoragePtr->writeItem(mNsIndex, nvs::ItemType::SZ, key, str, strlen(str) + 1);
+}
+
+esp_err_t NVSHandleSimple::set_blob(const char *key, const void* blob, size_t len)
+{
+    if (!valid) return ESP_ERR_NVS_INVALID_HANDLE;
+    if (mReadOnly) return ESP_ERR_NVS_READ_ONLY;
+
+    return mStoragePtr->writeItem(mNsIndex, nvs::ItemType::BLOB, key, blob, len);
+}
+
+esp_err_t NVSHandleSimple::get_string(const char *key, char* out_str, size_t len)
+{
+    if (!valid) return ESP_ERR_NVS_INVALID_HANDLE;
+
+    return ESP_FAIL;
+}
+
+esp_err_t NVSHandleSimple::get_blob(const char *key, void* out_blob, size_t len)
+{
+    if (!valid) return ESP_ERR_NVS_INVALID_HANDLE;
+
+    return ESP_FAIL;
+}
+
+esp_err_t NVSHandleSimple::get_item_size(ItemType datatype, const char *key, size_t &size)
+{
+    if (!valid) return ESP_ERR_NVS_INVALID_HANDLE;
+
+    return mStoragePtr->getItemDataSize(mNsIndex, datatype, key, size);
+}
+
+esp_err_t NVSHandleSimple::erase_item(const char* key)
+{
+    if (!valid) return ESP_ERR_NVS_INVALID_HANDLE;
+    if (mReadOnly) return ESP_ERR_NVS_READ_ONLY;
+
+    return mStoragePtr->eraseItem(mNsIndex, key);
+}
+
+esp_err_t NVSHandleSimple::erase_all()
+{
+    if (!valid) return ESP_ERR_NVS_INVALID_HANDLE;
+    if (mReadOnly) return ESP_ERR_NVS_READ_ONLY;
+
+    return mStoragePtr->eraseNamespace(mNsIndex);
+}
+
+esp_err_t NVSHandleSimple::commit()
+{
+    if (!valid) return ESP_ERR_NVS_INVALID_HANDLE;
+
+    return ESP_OK;
+}
+
+esp_err_t NVSHandleSimple::get_used_entry_count(size_t& used_entries)
+{
+    used_entries = 0;
+
+    if (!valid) return ESP_ERR_NVS_INVALID_HANDLE;
+
+    size_t used_entry_count;
+    esp_err_t err = mStoragePtr->calcEntriesInNamespace(mNsIndex, used_entry_count);
+    if(err == ESP_OK){
+        used_entries = used_entry_count;
+    }
+    return err;
+}
+
+void NVSHandleSimple::debugDump() {
+    return mStoragePtr->debugDump();
+}
+
+esp_err_t NVSHandleSimple::fillStats(nvs_stats_t& nvsStats) {
+    return mStoragePtr->fillStats(nvsStats);
+}
+
+esp_err_t NVSHandleSimple::calcEntriesInNamespace(size_t& usedEntries) {
+    return mStoragePtr->calcEntriesInNamespace(mNsIndex, usedEntries);
+}
+
+bool NVSHandleSimple::findEntry(nvs_opaque_iterator_t* it, const char* name) {
+    return mStoragePtr->findEntry(it, name);
+}
+
+bool NVSHandleSimple::nextEntry(nvs_opaque_iterator_t* it) {
+    return mStoragePtr->nextEntry(it);
+}
+
+}