mirror of https://github.com/arendst/Tasmota.git
166 lines
3.4 KiB
C++
166 lines
3.4 KiB
C++
/*
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xdrv_23_zigbee_7_6_flash_fs.ino - implement a Flash based read-only triviall file-system
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Copyright (C) 2022 Theo Arends and Stephan Hadinger
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#if defined(USE_ZIGBEE) || defined(USE_BERRY)
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#ifdef ESP32
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#include <vfs_api.h>
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#else
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#include "FSImpl.h"
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#endif
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/********************************************************************
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** Subfile implementation
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**
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** Takes a string point in Flash and turn it to a read-only file
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********************************************************************/
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class FlashFileImpl;
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typedef std::shared_ptr<FlashFileImpl> FlashFileImplPtr;
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class FlashFileImpl : public FileImpl {
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public:
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FlashFileImpl(const char* str) {
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_buf = str;
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_len = strlen_P(str);
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_seek = 0;
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}
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FlashFileImpl(const void* buf, size_t len) {
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_buf = (const char*)buf;
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_len = len;
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_seek = 0;
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}
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virtual ~FlashFileImpl() {}
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size_t write(const uint8_t *buf, size_t size) {
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return 0; // not accepted
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}
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size_t read(uint8_t* buf, size_t size) {
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if (_seek < _len) {
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if (size + _seek > _len) {
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size = _len - _seek; // always > 0 because of guarding test
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}
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memcpy_P(buf, _buf + _seek, size);
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_seek += size;
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return size;
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}
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return 0; // abort
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}
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void flush() {
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// do nothing
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}
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bool setBufferSize(size_t size) {
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return true;
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}
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bool seek(uint32_t pos, SeekMode mode) {
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// AddLog(LOG_LEVEL_DEBUG, "ZIP: seek pos=%i mode=%i", pos, mode);
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if (SeekSet == mode) {
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if (pos <= _len) {
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_seek = pos;
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return true;
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}
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} else if (SeekCur == mode) {
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if (_seek + pos <= _len) {
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_seek += pos;
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return true;
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}
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} else if (SeekEnd == mode) {
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_seek = _len;
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return true;
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}
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return false;
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}
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size_t position() const {
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return _seek;
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}
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size_t size() const {
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return _len;
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}
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void close() {
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// do nothing
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}
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time_t getLastWrite() {
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return 0;
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}
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const char* path() const {
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return "";
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}
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#ifdef ESP32
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bool seekDir(long position){
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return false;
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// ignore
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}
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String getNextFileName(void)
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{
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return "";
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// ignore
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}
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String getNextFileName(bool *isDir)
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{
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return "";
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// ignore
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}
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#endif // ESP32
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const char* name() const {
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return "<internal>";
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}
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boolean isDirectory(void) {
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return false; // no directory allowed
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}
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FileImplPtr openNextFile(const char* mode) {
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return nullptr; // TODO
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}
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void rewindDirectory(void) {
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// ignore
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}
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operator bool() {
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return true;
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}
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// ESP8266 specific?
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bool truncate(uint32_t size) { return false; }
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const char* fullName() const { return ""; }
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bool isFile() const { return true; }
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bool isDirectory() const { return false; }
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protected:
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const char * _buf;
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size_t _len;
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uint32_t _seek;
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};
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#endif // USE_ZIGBEE
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