| /* |
| * Copyright (c) 2019, The OpenThread Authors. |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. Neither the name of the copyright holder nor the |
| * names of its contributors may be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE |
| * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| * POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| /** |
| * @file |
| * This file implements OpenThread platform abstraction for storage of settings in RAM. |
| * |
| */ |
| |
| #include "settings.h" |
| |
| #include <assert.h> |
| #include <stddef.h> |
| #include <stdlib.h> |
| #include <string.h> |
| |
| #include <openthread/instance.h> |
| #include <openthread/platform/settings.h> |
| |
| #define SETTINGS_BUFFER_SIZE 1024 |
| |
| #if OPENTHREAD_SETTINGS_RAM |
| |
| static uint8_t sSettingsBuf[SETTINGS_BUFFER_SIZE]; |
| static uint16_t sSettingsBufLength; |
| |
| OT_TOOL_PACKED_BEGIN |
| struct settingsBlock |
| { |
| uint16_t key; |
| uint16_t length; |
| } OT_TOOL_PACKED_END; |
| |
| // settings API |
| void otPlatSettingsInit(otInstance *aInstance, const uint16_t *aSensitiveKeys, uint16_t aSensitiveKeysLength) |
| { |
| OT_UNUSED_VARIABLE(aInstance); |
| OT_UNUSED_VARIABLE(aSensitiveKeys); |
| OT_UNUSED_VARIABLE(aSensitiveKeysLength); |
| |
| sSettingsBufLength = 0; |
| } |
| |
| void otPlatSettingsDeinit(otInstance *aInstance) |
| { |
| OT_UNUSED_VARIABLE(aInstance); |
| } |
| |
| otError otPlatSettingsGet(otInstance *aInstance, uint16_t aKey, int aIndex, uint8_t *aValue, uint16_t *aValueLength) |
| { |
| OT_UNUSED_VARIABLE(aInstance); |
| |
| uint16_t i = 0; |
| uint16_t valueLength = 0; |
| uint16_t readLength; |
| int currentIndex = 0; |
| const struct settingsBlock *currentBlock; |
| otError error = OT_ERROR_NOT_FOUND; |
| |
| while (i < sSettingsBufLength) |
| { |
| currentBlock = (struct settingsBlock *)&sSettingsBuf[i]; |
| |
| if (aKey == currentBlock->key) |
| { |
| if (currentIndex == aIndex) |
| { |
| readLength = currentBlock->length; |
| |
| // Perform read only if an input buffer was passed in |
| if (aValue != NULL && aValueLength != NULL) |
| { |
| // Adjust read length if input buffer size is smaller |
| if (readLength > *aValueLength) |
| { |
| readLength = *aValueLength; |
| } |
| |
| memcpy(aValue, &sSettingsBuf[i + sizeof(struct settingsBlock)], readLength); |
| } |
| |
| valueLength = currentBlock->length; |
| error = OT_ERROR_NONE; |
| break; |
| } |
| |
| currentIndex++; |
| } |
| |
| i += sizeof(struct settingsBlock) + currentBlock->length; |
| } |
| |
| if (aValueLength != NULL) |
| { |
| *aValueLength = valueLength; |
| } |
| |
| return error; |
| } |
| |
| otError otPlatSettingsSet(otInstance *aInstance, uint16_t aKey, const uint8_t *aValue, uint16_t aValueLength) |
| { |
| uint16_t i = 0; |
| uint16_t currentBlockLength; |
| uint16_t nextBlockStart; |
| const struct settingsBlock *currentBlock; |
| |
| // Delete all entries of aKey |
| while (i < sSettingsBufLength) |
| { |
| currentBlock = (struct settingsBlock *)&sSettingsBuf[i]; |
| currentBlockLength = sizeof(struct settingsBlock) + currentBlock->length; |
| |
| if (aKey == currentBlock->key) |
| { |
| nextBlockStart = i + currentBlockLength; |
| |
| if (nextBlockStart < sSettingsBufLength) |
| { |
| memmove(&sSettingsBuf[i], &sSettingsBuf[nextBlockStart], sSettingsBufLength - nextBlockStart); |
| } |
| |
| assert(sSettingsBufLength >= currentBlockLength); |
| sSettingsBufLength -= currentBlockLength; |
| } |
| else |
| { |
| i += currentBlockLength; |
| } |
| } |
| |
| return otPlatSettingsAdd(aInstance, aKey, aValue, aValueLength); |
| } |
| |
| otError otPlatSettingsAdd(otInstance *aInstance, uint16_t aKey, const uint8_t *aValue, uint16_t aValueLength) |
| { |
| OT_UNUSED_VARIABLE(aInstance); |
| |
| otError error; |
| struct settingsBlock *currentBlock; |
| const uint16_t newBlockLength = sizeof(struct settingsBlock) + aValueLength; |
| |
| if (sSettingsBufLength + newBlockLength <= sizeof(sSettingsBuf)) |
| { |
| currentBlock = (struct settingsBlock *)&sSettingsBuf[sSettingsBufLength]; |
| currentBlock->key = aKey; |
| currentBlock->length = aValueLength; |
| |
| memcpy(&sSettingsBuf[sSettingsBufLength + sizeof(struct settingsBlock)], aValue, aValueLength); |
| sSettingsBufLength += newBlockLength; |
| |
| error = OT_ERROR_NONE; |
| } |
| else |
| { |
| error = OT_ERROR_NO_BUFS; |
| } |
| |
| return error; |
| } |
| |
| otError otPlatSettingsDelete(otInstance *aInstance, uint16_t aKey, int aIndex) |
| { |
| OT_UNUSED_VARIABLE(aInstance); |
| |
| uint16_t i = 0; |
| int currentIndex = 0; |
| uint16_t nextBlockStart; |
| uint16_t currentBlockLength; |
| const struct settingsBlock *currentBlock; |
| otError error = OT_ERROR_NOT_FOUND; |
| |
| while (i < sSettingsBufLength) |
| { |
| currentBlock = (struct settingsBlock *)&sSettingsBuf[i]; |
| currentBlockLength = sizeof(struct settingsBlock) + currentBlock->length; |
| |
| if (aKey == currentBlock->key) |
| { |
| if (currentIndex == aIndex) |
| { |
| nextBlockStart = i + currentBlockLength; |
| |
| if (nextBlockStart < sSettingsBufLength) |
| { |
| memmove(&sSettingsBuf[i], &sSettingsBuf[nextBlockStart], sSettingsBufLength - nextBlockStart); |
| } |
| |
| assert(sSettingsBufLength >= currentBlockLength); |
| sSettingsBufLength -= currentBlockLength; |
| |
| error = OT_ERROR_NONE; |
| break; |
| } |
| else |
| { |
| currentIndex++; |
| } |
| } |
| |
| i += currentBlockLength; |
| } |
| |
| return error; |
| } |
| |
| void otPlatSettingsWipe(otInstance *aInstance) |
| { |
| otPlatSettingsInit(aInstance); |
| } |
| |
| #endif // OPENTHREAD_SETTINGS_RAM |