Berry solidification of the partition core engine

lib/libesp32/berry/default/be_modtab.c

@@ -46,6 +46,7 @@ be_extern_native_module(hue_ntv);
 be_extern_native_module(hue_bridge);
 be_extern_native_module(uuid);
 be_extern_native_module(animate);
+be_extern_native_module(partition);
 #ifdef USE_LVGL
 be_extern_native_module(lv);
 be_extern_native_module(lv_extra);
@@ -146,6 +147,7 @@ BERRY_LOCAL const bntvmodule* const be_module_table[] = {
     &be_native_module(webserver),
 #endif // USE_WEBSERVER
     &be_native_module(flash),
+    &be_native_module(partition),
 
     /* user-defined modules register end */
     NULL /* do not remove */

lib/libesp32/berry/generate/be_const_strtab.h

@@ -1,4 +1,6 @@
 extern const bcstring be_const_str_;
+extern const bcstring be_const_str_00;
+extern const bcstring be_const_str_AA50;
 extern const bcstring be_const_str_AES_GCM;
 extern const bcstring be_const_str_ALIGN_BOTTOM_MID;
 extern const bcstring be_const_str_ALIGN_LEFT_MID;
@@ -16,6 +18,7 @@ extern const bcstring be_const_str_Auto_X2Dconfiguration;
 extern const bcstring be_const_str_BECDFE;
 extern const bcstring be_const_str_BLE;
 extern const bcstring be_const_str_BRY_X3A_X20ERROR_X2C_X20bad_X20json_X3A_X20;
+extern const bcstring be_const_str_BRY_X3A_X20Exception_X3E_X20_X27;
 extern const bcstring be_const_str_BRY_X3A_X20Exception_X3E_X20_X27_X25s_X27_X20_X2D_X20_X25s;
 extern const bcstring be_const_str_BRY_X3A_X20argument_X20must_X20be_X20a_X20function;
 extern const bcstring be_const_str_BRY_X3A_X20bytecode_X20has_X20wrong_X20version_X20_X27_X25s_X27_X20_X28_X25i_X29;
@@ -50,12 +53,14 @@ extern const bcstring be_const_str_COLOR_BLACK;
 extern const bcstring be_const_str_COLOR_WHITE;
 extern const bcstring be_const_str_CT;
 extern const bcstring be_const_str_DIMMER;
+extern const bcstring be_const_str_EBEBFFFFFFFFFFFFFFFFFFFFFFFFFFFF;
 extern const bcstring be_const_str_EC_C25519;
 extern const bcstring be_const_str_EVENT_DELETE;
 extern const bcstring be_const_str_EVENT_DRAW_MAIN;
 extern const bcstring be_const_str_EVENT_DRAW_PART_BEGIN;
 extern const bcstring be_const_str_EVENT_DRAW_PART_END;
 extern const bcstring be_const_str_EXTERNAL_I2S;
+extern const bcstring be_const_str_FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF;
 extern const bcstring be_const_str_False;
 extern const bcstring be_const_str_GET;
 extern const bcstring be_const_str_HTTP_GET;
@@ -64,17 +69,22 @@ extern const bcstring be_const_str_I2C_Driver;
 extern const bcstring be_const_str_I2C_X3A;
 extern const bcstring be_const_str_INTERNAL_DAC;
 extern const bcstring be_const_str_INTERNAL_PDM;
+extern const bcstring be_const_str_Invalid_X20ota_X20partition_X20number;
 extern const bcstring be_const_str_LVG_X3A_X20call_X20to_X20unsupported_X20callback;
 extern const bcstring be_const_str_Leds;
 extern const bcstring be_const_str_MAX_RMT;
 extern const bcstring be_const_str_MD5;
 extern const bcstring be_const_str_MI32;
+extern const bcstring be_const_str_No_X20SPIFFS_X20partition_X20found;
 extern const bcstring be_const_str_None;
 extern const bcstring be_const_str_OPTION_A;
 extern const bcstring be_const_str_OneWire;
 extern const bcstring be_const_str_PART_MAIN;
 extern const bcstring be_const_str_POST;
 extern const bcstring be_const_str_Parameter_X20error;
+extern const bcstring be_const_str_Partition;
+extern const bcstring be_const_str_Partition_info;
+extern const bcstring be_const_str_Partition_otadata;
 extern const bcstring be_const_str_RELAY;
 extern const bcstring be_const_str_RES_OK;
 extern const bcstring be_const_str_RGB;
@@ -111,6 +121,7 @@ extern const bcstring be_const_str_TAP_X3A_X20Loaded_X20Tasmota_X20App_X20_X27_X
 extern const bcstring be_const_str_TASMOTA;
 extern const bcstring be_const_str_Tasmota;
 extern const bcstring be_const_str_Tele;
+extern const bcstring be_const_str_Too_X20many_X20partiition_X20slots;
 extern const bcstring be_const_str_Trigger;
 extern const bcstring be_const_str_True;
 extern const bcstring be_const_str_Unknown;
@@ -120,7 +131,10 @@ extern const bcstring be_const_str_WS2812_GRB;
 extern const bcstring be_const_str_Wire;
 extern const bcstring be_const_str__;
 extern const bcstring be_const_str__X0A;
+extern const bcstring be_const_str__X0A_X29_X3E;
 extern const bcstring be_const_str__X20;
+extern const bcstring be_const_str__X20_X20;
+extern const bcstring be_const_str__X20_X28;
 extern const bcstring be_const_str__X21_X3D;
 extern const bcstring be_const_str__X21_X3D_X3D;
 extern const bcstring be_const_str__X22;
@@ -138,7 +152,9 @@ extern const bcstring be_const_str__X2508x_X2D_X2504x_X2D_X2504x_X2D_X2504x_X2D_
 extern const bcstring be_const_str__X25s_X2Eautoconf;
 extern const bcstring be_const_str__X26lt_X3BError_X3A_X20apply_X20new_X20or_X20remove_X26gt_X3B;
 extern const bcstring be_const_str__X26lt_X3BNone_X26gt_X3B;
+extern const bcstring be_const_str__X27_X20_X2D_X20;
 extern const bcstring be_const_str__X28_X29;
+extern const bcstring be_const_str__X29;
 extern const bcstring be_const_str__X2A;
 extern const bcstring be_const_str__X2B;
 extern const bcstring be_const_str__X2C;
@@ -172,6 +188,9 @@ extern const bcstring be_const_str__X3C_X3D;
 extern const bcstring be_const_str__X3Cbutton_X20name_X3D_X27reapply_X27_X20class_X3D_X27button_X20bgrn_X27_X3ERe_X2Dapply_X20current_X20configuration_X3C_X2Fbutton_X3E;
 extern const bcstring be_const_str__X3Cbutton_X20name_X3D_X27zipapply_X27_X20class_X3D_X27button_X20bgrn_X27_X3EApply_X20configuration_X3C_X2Fbutton_X3E;
 extern const bcstring be_const_str__X3Cfieldset_X3E_X3Cstyle_X3E_X2Ebdis_X7Bbackground_X3A_X23888_X3B_X7D_X2Ebdis_X3Ahover_X7Bbackground_X3A_X23888_X3B_X7D_X3C_X2Fstyle_X3E;
+extern const bcstring be_const_str__X3Cinstance_X3A_X20Partition_X28_X5B_X0A;
+extern const bcstring be_const_str__X3Cinstance_X3A_X20Partition_info_X28_X25d_X25s_X2C_X25d_X25s_X2C0x_X2508X_X2C0x_X2508X_X2C_X27_X25s_X27_X2C0x_X25X_X29_X3E;
+extern const bcstring be_const_str__X3Cinstance_X3A_X20Partition_otadata_X28ota_active_X3A_X25d_X2C_X20ota_seq_X3D_X5B_X25d_X2C_X25d_X5D_X2C_X20ota_max_X3D_X25d_X29_X3E;
 extern const bcstring be_const_str__X3Cinstance_X3A_X20_X25s_X28_X25s_X2C_X20_X25s_X2C_X20_X25s_X29;
 extern const bcstring be_const_str__X3Clabel_X3EChoose_X20a_X20device_X20configuration_X3A_X3C_X2Flabel_X3E_X3Cbr_X3E;
 extern const bcstring be_const_str__X3Clambda_X3E;
@@ -195,6 +214,7 @@ extern const bcstring be_const_str__X3E_X3D;
 extern const bcstring be_const_str__X3F;
 extern const bcstring be_const_str__X5B;
 extern const bcstring be_const_str__X5D;
+extern const bcstring be_const_str__X5D_X2C_X0A_X20_X20;
 extern const bcstring be_const_str__X7B;
 extern const bcstring be_const_str__X7B_X7D;
 extern const bcstring be_const_str__X7Bs_X7DBatt_X20Current_X7Bm_X7D_X25_X2E1f_X20mA_X7Be_X7D;
@@ -240,10 +260,12 @@ extern const bcstring be_const_str__settings_ptr;
 extern const bcstring be_const_str__splash;
 extern const bcstring be_const_str__t;
 extern const bcstring be_const_str__timers;
+extern const bcstring be_const_str__validate;
 extern const bcstring be_const_str__write;
 extern const bcstring be_const_str_a;
 extern const bcstring be_const_str_abs;
 extern const bcstring be_const_str_acos;
+extern const bcstring be_const_str_active_otadata;
 extern const bcstring be_const_str_add;
 extern const bcstring be_const_str_add_anim;
 extern const bcstring be_const_str_add_cb_event_closure;
@@ -264,6 +286,7 @@ extern const bcstring be_const_str_allocated;
 extern const bcstring be_const_str_alternate;
 extern const bcstring be_const_str_animate;
 extern const bcstring be_const_str_animators;
+extern const bcstring be_const_str_app;
 extern const bcstring be_const_str_arc_dsc;
 extern const bcstring be_const_str_arch;
 extern const bcstring be_const_str_area;
@@ -353,11 +376,15 @@ extern const bcstring be_const_str_content_stop;
 extern const bcstring be_const_str_continue;
 extern const bcstring be_const_str_coord_arr;
 extern const bcstring be_const_str_copy;
+extern const bcstring be_const_str_coredump;
 extern const bcstring be_const_str_cos;
 extern const bcstring be_const_str_cosh;
 extern const bcstring be_const_str_couldn_X27t_X20not_X20initialize_X20noepixelbus;
 extern const bcstring be_const_str_count;
 extern const bcstring be_const_str_counters;
+extern const bcstring be_const_str_crc32_ota_seq;
+extern const bcstring be_const_str_crc32_table;
+extern const bcstring be_const_str_crc32_update;
 extern const bcstring be_const_str_create_custom_widget;
 extern const bcstring be_const_str_create_matrix;
 extern const bcstring be_const_str_create_segment;
@@ -366,6 +393,7 @@ extern const bcstring be_const_str_ctor;
 extern const bcstring be_const_str_ctypes_bytes;
 extern const bcstring be_const_str_ctypes_bytes_dyn;
 extern const bcstring be_const_str_dac_voltage;
+extern const bcstring be_const_str_data;
 extern const bcstring be_const_str_day;
 extern const bcstring be_const_str_debug;
 extern const bcstring be_const_str_decode;
@@ -403,6 +431,7 @@ extern const bcstring be_const_str_driver_name;
 extern const bcstring be_const_str_dump;
 extern const bcstring be_const_str_duration;
 extern const bcstring be_const_str_editable;
+extern const bcstring be_const_str_efuse_em;
 extern const bcstring be_const_str_elements_X20must_X20be_X20a_X20lv_point;
 extern const bcstring be_const_str_elif;
 extern const bcstring be_const_str_else;
@@ -413,6 +442,7 @@ extern const bcstring be_const_str_energy_struct;
 extern const bcstring be_const_str_engine;
 extern const bcstring be_const_str_erase;
 extern const bcstring be_const_str_escape;
+extern const bcstring be_const_str_esphttpd;
 extern const bcstring be_const_str_eth;
 extern const bcstring be_const_str_event;
 extern const bcstring be_const_str_event_cb;
@@ -428,9 +458,11 @@ extern const bcstring be_const_str_exec_tele;
 extern const bcstring be_const_str_exists;
 extern const bcstring be_const_str_exp;
 extern const bcstring be_const_str_f;
+extern const bcstring be_const_str_factory;
 extern const bcstring be_const_str_false;
 extern const bcstring be_const_str_fast_loop;
 extern const bcstring be_const_str_fast_loop_enabled;
+extern const bcstring be_const_str_fat;
 extern const bcstring be_const_str_file;
 extern const bcstring be_const_str_file_X20extension_X20is_X20not_X20_X27_X2Ebe_X27_X20or_X20_X27_X2Ebec_X27;
 extern const bcstring be_const_str_files;
@@ -438,6 +470,8 @@ extern const bcstring be_const_str_find;
 extern const bcstring be_const_str_find_key_i;
 extern const bcstring be_const_str_find_op;
 extern const bcstring be_const_str_finish;
+extern const bcstring be_const_str_flags;
+extern const bcstring be_const_str_flash;
 extern const bcstring be_const_str_floor;
 extern const bcstring be_const_str_flush;
 extern const bcstring be_const_str_font_embedded;
@@ -460,6 +494,7 @@ extern const bcstring be_const_str_gc;
 extern const bcstring be_const_str_gen_cb;
 extern const bcstring be_const_str_get;
 extern const bcstring be_const_str_get_MAC;
+extern const bcstring be_const_str_get_active;
 extern const bcstring be_const_str_get_alternate;
 extern const bcstring be_const_str_get_aps_voltage;
 extern const bcstring be_const_str_get_bat_charge_current;
@@ -476,12 +511,14 @@ extern const bcstring be_const_str_get_event_cb;
 extern const bcstring be_const_str_get_free_heap;
 extern const bcstring be_const_str_get_height;
 extern const bcstring be_const_str_get_hor_res;
+extern const bcstring be_const_str_get_image_size;
 extern const bcstring be_const_str_get_input_power_status;
 extern const bcstring be_const_str_get_light;
 extern const bcstring be_const_str_get_log;
 extern const bcstring be_const_str_get_name;
 extern const bcstring be_const_str_get_object_from_ptr;
 extern const bcstring be_const_str_get_option;
+extern const bcstring be_const_str_get_ota_slot;
 extern const bcstring be_const_str_get_percentage;
 extern const bcstring be_const_str_get_pixel_color;
 extern const bcstring be_const_str_get_power;
@@ -540,12 +577,16 @@ extern const bcstring be_const_str_int64;
 extern const bcstring be_const_str_internal_error;
 extern const bcstring be_const_str_introspect;
 extern const bcstring be_const_str_invalid_X20GPIO_X20number;
+extern const bcstring be_const_str_invalid_X20magic_X20number_X20_X2502X;
 extern const bcstring be_const_str_invalidate;
+extern const bcstring be_const_str_invalidate_spiffs;
 extern const bcstring be_const_str_io_error;
 extern const bcstring be_const_str_ip;
 extern const bcstring be_const_str_is_dirty;
 extern const bcstring be_const_str_is_first_time;
+extern const bcstring be_const_str_is_ota;
 extern const bcstring be_const_str_is_running;
+extern const bcstring be_const_str_is_spiffs;
 extern const bcstring be_const_str_isinstance;
 extern const bcstring be_const_str_ismethod;
 extern const bcstring be_const_str_isnan;
@@ -575,6 +616,7 @@ extern const bcstring be_const_str_list_handlers;
 extern const bcstring be_const_str_listdir;
 extern const bcstring be_const_str_load;
 extern const bcstring be_const_str_load_freetype_font;
+extern const bcstring be_const_str_load_otadata;
 extern const bcstring be_const_str_load_templates;
 extern const bcstring be_const_str_local;
 extern const bcstring be_const_str_log;
@@ -610,6 +652,8 @@ extern const bcstring be_const_str_manuf;
 extern const bcstring be_const_str_map;
 extern const bcstring be_const_str_math;
 extern const bcstring be_const_str_matrix;
+extern const bcstring be_const_str_maxota;
+extern const bcstring be_const_str_md5;
 extern const bcstring be_const_str_member;
 extern const bcstring be_const_str_members;
 extern const bcstring be_const_str_memory;
@@ -631,6 +675,8 @@ extern const bcstring be_const_str_no_X20more_X20RMT_X20channel_X20available;
 extern const bcstring be_const_str_now;
 extern const bcstring be_const_str_null_cb;
 extern const bcstring be_const_str_number;
+extern const bcstring be_const_str_nvs;
+extern const bcstring be_const_str_nvskeys;
 extern const bcstring be_const_str_o;
 extern const bcstring be_const_str_obj;
 extern const bcstring be_const_str_obj_class_create_obj;
@@ -641,12 +687,17 @@ extern const bcstring be_const_str_on;
 extern const bcstring be_const_str_onsubmit_X3D_X27return_X20confirm_X28_X22This_X20will_X20cause_X20a_X20restart_X2E_X22_X29_X3B_X27_X3E;
 extern const bcstring be_const_str_onsubmit_X3D_X27return_X20confirm_X28_X22This_X20will_X20change_X20the_X20current_X20configuration_X20and_X20cause_X20a_X20restart_X2E_X22_X29_X3B_X27_X3E;
 extern const bcstring be_const_str_open;
+extern const bcstring be_const_str_ota;
+extern const bcstring be_const_str_ota_max;
+extern const bcstring be_const_str_otadata;
 extern const bcstring be_const_str_out_X20of_X20range;
 extern const bcstring be_const_str_p1;
 extern const bcstring be_const_str_p2;
 extern const bcstring be_const_str_page_autoconf_ctl;
 extern const bcstring be_const_str_page_autoconf_mgr;
 extern const bcstring be_const_str_param;
+extern const bcstring be_const_str_parse;
+extern const bcstring be_const_str_partition;
 extern const bcstring be_const_str_path;
 extern const bcstring be_const_str_pc;
 extern const bcstring be_const_str_pc_abs;
@@ -655,6 +706,7 @@ extern const bcstring be_const_str_pct;
 extern const bcstring be_const_str_percentage;
 extern const bcstring be_const_str_persist;
 extern const bcstring be_const_str_persist_X2E_p_X20is_X20not_X20a_X20map;
+extern const bcstring be_const_str_phy;
 extern const bcstring be_const_str_pi;
 extern const bcstring be_const_str_pin;
 extern const bcstring be_const_str_pin_mode;
@@ -683,6 +735,7 @@ extern const bcstring be_const_str_rad;
 extern const bcstring be_const_str_raise;
 extern const bcstring be_const_str_rand;
 extern const bcstring be_const_str_range;
+extern const bcstring be_const_str_raw;
 extern const bcstring be_const_str_read;
 extern const bcstring be_const_str_read12;
 extern const bcstring be_const_str_read13;
@@ -710,6 +763,7 @@ extern const bcstring be_const_str_remove_driver;
 extern const bcstring be_const_str_remove_light;
 extern const bcstring be_const_str_remove_rule;
 extern const bcstring be_const_str_remove_timer;
+extern const bcstring be_const_str_remove_trailing_zeroes;
 extern const bcstring be_const_str_reset;
 extern const bcstring be_const_str_reset_search;
 extern const bcstring be_const_str_resize;
@@ -748,9 +802,12 @@ extern const bcstring be_const_str_seg7_font;
 extern const bcstring be_const_str_select;
 extern const bcstring be_const_str_send;
 extern const bcstring be_const_str_send_multicast;
+extern const bcstring be_const_str_seq0;
+extern const bcstring be_const_str_seq1;
 extern const bcstring be_const_str_serial;
 extern const bcstring be_const_str_set;
 extern const bcstring be_const_str_set_MAC;
+extern const bcstring be_const_str_set_active;
 extern const bcstring be_const_str_set_align;
 extern const bcstring be_const_str_set_alternate;
 extern const bcstring be_const_str_set_auth;
@@ -776,6 +833,7 @@ extern const bcstring be_const_str_set_light;
 extern const bcstring be_const_str_set_matrix_pixel_color;
 extern const bcstring be_const_str_set_mode_ct;
 extern const bcstring be_const_str_set_mode_rgb;
+extern const bcstring be_const_str_set_ota_max;
 extern const bcstring be_const_str_set_percentage;
 extern const bcstring be_const_str_set_pixel_color;
 extern const bcstring be_const_str_set_power;
@@ -824,7 +882,9 @@ extern const bcstring be_const_str_sin;
 extern const bcstring be_const_str_sinh;
 extern const bcstring be_const_str_size;
 extern const bcstring be_const_str_skip;
+extern const bcstring be_const_str_slots;
 extern const bcstring be_const_str_solidified;
+extern const bcstring be_const_str_spiffs;
 extern const bcstring be_const_str_splash;
 extern const bcstring be_const_str_splash_init;
 extern const bcstring be_const_str_splash_remove;
@@ -844,6 +904,7 @@ extern const bcstring be_const_str_strip;
 extern const bcstring be_const_str_strptime;
 extern const bcstring be_const_str_style_prop_arr;
 extern const bcstring be_const_str_subscribe;
+extern const bcstring be_const_str_subtype;
 extern const bcstring be_const_str_success;
 extern const bcstring be_const_str_super;
 extern const bcstring be_const_str_sys;
@@ -858,6 +919,7 @@ extern const bcstring be_const_str_tasmota_X2Eset_light_X28_X29_X20is_X20depreca
 extern const bcstring be_const_str_tasmota_log_reader;
 extern const bcstring be_const_str_tcpclient;
 extern const bcstring be_const_str_tele;
+extern const bcstring be_const_str_test;
 extern const bcstring be_const_str_the_X20second_X20argument_X20is_X20not_X20a_X20function;
 extern const bcstring be_const_str_time_dump;
 extern const bcstring be_const_str_time_reached;

lib/libesp32/berry_tasmota/src/embedded/partition_embedded.be

@@ -0,0 +1,567 @@
+#######################################################################
+# Partition manager for ESP32 - ESP32C3 - ESP32S2
+#
+# use : `import partition`
+#
+# To solidify:
+#-
+   import solidify load("partition_embedded.be") solidify.dump(partition)
+-#
+# Provides low-level objects and a Web UI
+#######################################################################
+
+var partition = module('partition')
+
+#######################################################################
+# Class for a partition table entry
+#
+#   typedef struct {
+#       uint16_t magic;
+#       uint8_t  type;
+#       uint8_t  subtype;
+#       uint32_t offset;
+#       uint32_t size;
+#       uint8_t  label[16];
+#       uint32_t flags;
+#   } esp_partition_info_t_simplified;
+#
+#######################################################################
+class Partition_info
+  var type
+  var subtype
+  var start
+  var size
+  var label
+  var flags
+
+  #- remove trailing NULL chars from a bytes buffer before converting to string -#
+  #- Berry strings can contain NULL, but this messes up C-Berry interface -#
+  static def remove_trailing_zeroes(b)
+    var sz = size(b)
+    var i = 0
+    while i < sz
+      if b[-1-i] != 0   break end
+      i += 1
+    end
+    if i > 0
+      b.resize(size(b)-i)
+    end
+    return b
+  end
+    
+  # Init the Parition information structure, either from a bytes() buffer or an empty if no buffer is provided
+  def init(raw)
+    self.type = 0
+    self.subtype = 0
+    self.start = 0
+    self.size = 0
+    self.label = ''
+    self.flags = 0
+
+    if !issubclass(bytes, raw)    # no payload, empty partition information
+      return
+    end
+
+    #- we have a payload, parse it -#
+    var magic = raw.get(0,2)
+    if magic == 0x50AA    #- partition entry -#
+
+      self.type = raw.get(2,1)
+      self.subtype = raw.get(3,1)
+      self.start = raw.get(4,4)
+      self.size = raw.get(8,4)
+      self.label = self.remove_trailing_zeroes(raw[12..27]).asstring()
+      self.flags = raw.get(28,4)
+
+    # elif magic == 0xEBEB  #- MD5 -#
+    else
+      import string
+      raise  "internal_error", string.format("invalid magic number %02X", magic)
+    end
+    
+  end
+
+  # check if the parition is an OTA partition
+  # if yes, return OTA number (starting at 0)
+  # if no, return nil
+  def is_ota()
+    var sub_type = self.subtype
+    if self.type == 0 && (sub_type >= 0x10 && sub_type < 0x20)
+      return sub_type - 0x10
+    end
+  end
+
+  # check if the parition is a SPIFFS partition
+  # returns bool
+  def is_spiffs()
+    return self.type == 1 && self.subtype == 130
+  end
+
+  # get the actual image size give of the partition
+  # returns -1 if the partition is not an app ota partition
+  def get_image_size()
+    import flash
+    if self.is_ota() == nil return -1 end
+    try
+      var addr = self.start
+      var magic_byte = flash.read(addr, 1).get(0, 1)
+      if magic_byte != 0xE9 return -1 end
+      
+      var seg_count = flash.read(addr+1, 1).get(0, 1)
+      # print("Segment count", seg_count)
+      
+      var seg_offset = addr + 0x20 # sizeof(esp_image_header_t) + sizeof(esp_image_segment_header_t) = 24 + 8
+
+      var seg_num = 0
+      while seg_num < seg_count
+        # print(string.format("Reading 0x%08X", seg_offset))
+        var segment_header = flash.read(seg_offset - 8, 8)
+        var seg_start_addr = segment_header.get(0, 4)
+        var seg_size = segment_header.get(4,4)
+        # print(string.format("Segment %i: flash_offset=0x%08X start_addr=0x%08X size=0x%08X", seg_num, seg_offset, seg_start_addr, seg_size))
+
+        seg_offset += seg_size + 8    # add segment_length + sizeof(esp_image_segment_header_t)
+
+        seg_num += 1
+      end
+      var total_size = seg_offset - addr + 1 # add 1KB for safety
+
+      # print(string.format("Total size = %i KB", total_size/1024))
+
+      return total_size
+    except .. as e, m
+      tasmota.log("BRY: Exception> '" + e + "' - " + m, 2)
+      return -1
+    end
+  end
+
+  # Human readable version of Partition information
+  # this method is not included in the solidified version to save space,
+  # it is included only in the optional application `tapp` version
+  def tostring()
+    import string
+    var type_s = ""
+    var subtype_s = ""
+    if   self.type == 0  type_s = "app"
+      if   self.subtype == 0  subtype_s = "factory"
+      elif self.subtype >= 0x10 && self.subtype < 0x20 subtype_s = "ota" + str(self.subtype - 0x10)
+      elif self.subtype == 0x20  subtype_s = "test"
+      end
+    elif self.type == 1  type_s = "data"
+      if   self.subtype == 0x00  subtype_s = "otadata"
+      elif self.subtype == 0x01  subtype_s = "phy"
+      elif self.subtype == 0x02  subtype_s = "nvs"
+      elif self.subtype == 0x03  subtype_s = "coredump"
+      elif self.subtype == 0x04  subtype_s = "nvskeys"
+      elif self.subtype == 0x05  subtype_s = "efuse_em"
+      elif self.subtype == 0x80  subtype_s = "esphttpd"
+      elif self.subtype == 0x81  subtype_s = "fat"
+      elif self.subtype == 0x82  subtype_s = "spiffs"
+      end
+    end
+
+    # reformat strings
+    if type_s != ""    type_s = " (" + type_s + ")" end
+    if subtype_s != "" subtype_s = " (" + subtype_s + ")" end
+    return string.format("<instance: Partition_info(%d%s,%d%s,0x%08X,0x%08X,'%s',0x%X)>",
+                          self.type, type_s,
+                          self.subtype, subtype_s,
+                          self.start, self.size,
+                          self.label, self.flags)
+  end
+
+  def tobytes()
+    #- convert to raw bytes -#
+    var b = bytes('AA50')     #- set magic number -#
+    b.resize(32).resize(2)    #- pre-reserve 32 bytes -#
+    b.add(self.type, 1)
+    b.add(self.subtype, 1)
+    b.add(self.start, 4)
+    b.add(self.size, 4)
+    var label = bytes().fromstring(self.label)
+    label.resize(16)
+    b = b + label
+    b.add(self.flags, 4)
+    return b
+  end
+
+end
+partition.Partition_info = Partition_info
+
+#-------------------------------------------------------------
+ - OTA Data
+ -
+ - Selection of the active OTA partition
+ -
+    typedef struct {
+        uint32_t ota_seq;
+        uint8_t  seq_label[20];
+        uint32_t ota_state;
+        uint32_t crc; /* CRC32 of ota_seq field only */
+    } esp_ota_select_entry_t;
+
+  - Excerp from esp_ota_ops.c
+      esp32_idf use two sector for store information about which partition is running
+      it defined the two sector as ota data partition,two structure esp_ota_select_entry_t is saved in the two sector
+      named data in first sector as otadata[0], second sector data as otadata[1]
+      e.g.
+      if otadata[0].ota_seq == otadata[1].ota_seq == 0xFFFFFFFF,means ota info partition is in init status
+      so it will boot factory application(if there is),if there's no factory application,it will boot ota[0] application
+      if otadata[0].ota_seq != 0 and otadata[1].ota_seq != 0,it will choose a max seq ,and get value of max_seq%max_ota_app_number
+      and boot a subtype (mask 0x0F) value is (max_seq - 1)%max_ota_app_number,so if want switch to run ota[x],can use next formulas.
+      for example, if otadata[0].ota_seq = 4, otadata[1].ota_seq = 5, and there are 8 ota application,
+      current running is (5-1)%8 = 4,running ota[4],so if we want to switch to run ota[7],
+      we should add otadata[0].ota_seq (is 4) to 4 ,(8-1)%8=7,then it will boot ota[7]
+      if      A=(B - C)%D
+      then    B=(A + C)%D + D*n ,n= (0,1,2...)
+      so current ota app sub type id is x , dest bin subtype is y,total ota app count is n
+      seq will add (x + n*1 + 1 - seq)%n
+ -------------------------------------------------------------#
+class Partition_otadata
+  var maxota          #- number of highest OTA partition, default 1 (double ota0/ota1) -#
+  var offset          #- offset of the otadata partition (0x2000 in length), default 0xE000 -#
+  var active_otadata  #- which otadata block is active, 0 or 1, i.e. 0xE000 or 0xF000 -#
+  var seq0            #- ota_seq of first block -#
+  var seq1            #- ota_seq of second block -#
+
+  # the following is not included in the solidified version
+  #-------------------------------------------------------------
+  - Simple CRC32 imple
+  -
+  - adapted from Python https://rosettacode.org/wiki/CRC-32#Python
+  -------------------------------------------------------------#
+  # static def crc32_create_table()
+  #   var a = []
+  #   for i:0..255
+  #     var k = i
+  #     for j:0..7
+  #       if k & 1
+  #         k = (k >> 1) & 0x7FFFFFFF
+  #         k ^= 0xedb88320
+  #       else
+  #         k = (k >> 1) & 0x7FFFFFFF
+  #       end
+  #     end
+  #     a.push(k)
+  #   end
+  #   return a
+  # end
+  # static crc32_table = Partition_otadata.crc32_create_table()
+
+  # comptued in advanced
+  static crc32_table = [
+    0, 1996959894, -301047508, -1727442502, 124634137, 1886057615, -379345611, -1637575261,
+    249268274, 2044508324, -522852066, -1747789432, 162941995, 2125561021, -407360249, -1866523247,
+    498536548, 1789927666, -205950648, -2067906082, 450548861, 1843258603, -187386543, -2083289657,
+    325883990, 1684777152, -43845254, -1973040660, 335633487, 1661365465, -99664541, -1928851979,
+    997073096, 1281953886, -715111964, -1570279054, 1006888145, 1258607687, -770865667, -1526024853,
+    901097722, 1119000684, -608450090, -1396901568, 853044451, 1172266101, -589951537, -1412350631,
+    651767980, 1373503546, -925412992, -1076862698, 565507253, 1454621731, -809855591, -1195530993,
+     671266974, 1594198024, -972236366, -1324619484, 795835527, 1483230225, -1050600021, -1234817731,
+     1994146192, 31158534, -1731059524, -271249366, 1907459465, 112637215, -1614814043, -390540237,
+     2013776290, 251722036, -1777751922, -519137256, 2137656763, 141376813, -1855689577, -429695999,
+     1802195444, 476864866, -2056965928, -228458418, 1812370925, 453092731, -2113342271, -183516073,
+     1706088902, 314042704, -1950435094, -54949764, 1658658271, 366619977, -1932296973, -69972891,
+     1303535960, 984961486, -1547960204, -725929758, 1256170817, 1037604311, -1529756563, -740887301,
+     1131014506, 879679996, -1385723834, -631195440, 1141124467, 855842277, -1442165665, -586318647,
+     1342533948, 654459306, -1106571248, -921952122, 1466479909, 544179635, -1184443383, -832445281,
+     1591671054, 702138776, -1328506846, -942167884, 1504918807, 783551873, -1212326853, -1061524307,
+     -306674912, -1698712650, 62317068, 1957810842, -355121351, -1647151185, 81470997, 1943803523,
+     -480048366, -1805370492, 225274430, 2053790376, -468791541, -1828061283, 167816743, 2097651377,
+     -267414716, -2029476910, 503444072, 1762050814, -144550051, -2140837941, 426522225, 1852507879,
+     -19653770, -1982649376, 282753626, 1742555852, -105259153, -1900089351, 397917763, 1622183637,
+     -690576408, -1580100738, 953729732, 1340076626, -776247311, -1497606297, 1068828381, 1219638859,
+     -670225446, -1358292148, 906185462, 1090812512, -547295293, -1469587627, 829329135, 1181335161,
+     -882789492, -1134132454, 628085408, 1382605366, -871598187, -1156888829, 570562233, 1426400815,
+     -977650754, -1296233688, 733239954, 1555261956, -1026031705, -1244606671, 752459403, 1541320221,
+     -1687895376, -328994266, 1969922972, 40735498, -1677130071, -351390145, 1913087877, 83908371,
+     -1782625662, -491226604, 2075208622, 213261112, -1831694693, -438977011, 2094854071, 198958881,
+     -2032938284, -237706686, 1759359992, 534414190, -2118248755, -155638181, 1873836001, 414664567,
+     -2012718362, -15766928, 1711684554, 285281116, -1889165569, -127750551, 1634467795, 376229701,
+     -1609899400, -686959890, 1308918612, 956543938, -1486412191, -799009033, 1231636301, 1047427035,
+     -1362007478, -640263460, 1088359270, 936918000, -1447252397, -558129467, 1202900863, 817233897,
+     -1111625188, -893730166, 1404277552, 615818150, -1160759803, -841546093, 1423857449, 601450431,
+     -1285129682, -1000256840, 1567103746, 711928724, -1274298825, -1022587231, 1510334235, 755167117]
+
+  static def crc32_update(buf, crc)
+    crc ^= 0xffffffff
+    var crc32_table = partition.Partition_otadata.crc32_table
+    for k:0..size(buf)-1
+      crc = (crc >> 8 & 0x00FFFFFF) ^ crc32_table[(crc & 0xff) ^ buf[k]]
+    end
+    return crc ^ 0xffffffff
+  end
+
+  #- crc32 for ota_seq as 32 bits unsigned, with init vector -1 -#
+  static def crc32_ota_seq(seq)
+    return partition.Partition_otadata.crc32_update(bytes().add(seq, 4), 0xFFFFFFFF)
+  end
+
+  #---------------------------------------------------------------------#
+  # Rest of the class
+  #---------------------------------------------------------------------#
+  def init(maxota, offset)
+    self.maxota = maxota
+    if self.maxota == nil  self.maxota = 1 end
+    self.offset = offset
+    if self.offset == nil  self.offset = 0xE000 end
+    self.active_otadata = 0
+    self.load()
+  end
+
+  #- update ota_max, needs to recompute everything -#
+  def set_ota_max(n)
+    self.maxota = n
+  end
+
+  # change the active OTA partition
+  def set_active(n)
+    var seq_max = 0     #- current highest seq number -#
+    var block_act = 0   #- block number containing the highest seq number -#
+
+    if self.seq0 != nil
+      seq_max = self.seq0
+      block_act = 0
+    end
+    if self.seq1 != nil && self.seq1 > seq_max
+      seq_max = self.seq1
+      block_act = 1
+    end
+    
+    #- compute the next sequence number -#
+    var actual_ota = (seq_max - 1) % (self.maxota + 1)
+    if actual_ota != n    #- change only if different -#
+      if n > actual_ota   seq_max += n - actual_ota
+      else                seq_max += (self.maxota + 1) - actual_ota + n
+      end
+      
+      #- update internal structure -#
+      if block_act == 1       #- current block is 1, so update block 0 -#
+        self.seq0 = seq_max
+      else                    #- or write to block 1 -#
+        self.seq1 = seq_max
+      end
+      self._validate()
+    end
+  end
+
+  #- load otadata from SPI Flash -#
+  def load()
+    import flash
+    var otadata0 = flash.read(0xE000, 32)
+    var otadata1 = flash.read(0xF000, 32)
+    self.seq0 = otadata0.get(0, 4)   #- ota_seq for block 1 -#
+    self.seq1 = otadata1.get(0, 4)   #- ota_seq for block 2 -#
+    var valid0 = otadata0.get(28, 4) == self.crc32_ota_seq(self.seq0) #- is CRC32 valid? -#
+    var valid1 = otadata1.get(28, 4) == self.crc32_ota_seq(self.seq1) #- is CRC32 valid? -#
+    if !valid0   self.seq0 = nil end
+    if !valid1   self.seq1 = nil end
+
+    self._validate()
+  end
+
+  #- internally used, validate data -#
+  def _validate()
+    self.active_otadata = 0        #- if none is valid, default to OTA0 -#
+    if self.seq0 != nil
+      self.active_otadata = (self.seq0 - 1) % (self.maxota + 1)
+    end
+    if self.seq1 != nil && (self.seq0 == nil || self.seq1 > self.seq0)
+      self.active_otadata = (self.seq1 - 1) % (self.maxota + 1)
+    end
+  end
+
+  # Save partition information to SPI Flash
+  def save()
+    import flash
+    #- check the block number to save, 0 or 1. Choose the highest ota_seq -#
+    var block_to_save = -1    #- invalid -#
+    var seq_to_save = -1      #- invalid value -#
+    
+    # check seq0
+    if self.seq0 != nil
+      seq_to_save = self.seq0
+      block_to_save = 0
+    end
+    if (self.seq1 != nil) && (self.seq1 > seq_to_save)
+      seq_to_save = self.seq1
+      block_to_save = 1
+    end
+    # if none was good
+    if block_to_save < 0    block_to_save = 0 end
+    if seq_to_save < 0      seq_to_save = 1 end
+
+    var offset_to_save = self.offset + 0x1000 * block_to_save   #- default 0xE000 or 0xF000 -#
+
+    var bytes_to_save = bytes()
+    bytes_to_save.add(seq_to_save, 4)
+    bytes_to_save += bytes("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF")
+    bytes_to_save.add(self.crc32_ota_seq(seq_to_save), 4)
+    
+    #- erase flash area and write -#
+    flash.erase(offset_to_save, 0x1000)
+    flash.write(offset_to_save, bytes_to_save)
+  end
+
+  # Produce a human-readable representation of the object with relevant information
+  def tostring()
+    import string
+    return string.format("<instance: Partition_otadata(ota_active:%d, ota_seq=[%d,%d], ota_max=%d)>",
+                          self.active_otadata, self.seq0, self.seq1, self.maxota)
+  end
+end
+partition.Partition_otadata = Partition_otadata
+
+#-------------------------------------------------------------
+ - Class for a partition table entry
+ -------------------------------------------------------------#
+class Partition
+  var raw   #- raw bytes of the partition table in flash -#
+  var md5   #- md5 hash of partition list -#
+  var slots
+  var otadata   #- instance of Partition_otadata() -#
+
+  def init()
+    self.slots = []
+    self.load()
+    self.parse()
+    self.load_otadata()
+  end
+
+  # Load partition information from SPI Flash
+  def load()
+    import flash
+    self.raw = flash.read(0x8000,0x1000)
+  end
+
+  #- parse the raw bytes to a structured list of partition items -#
+  def parse()
+    for i:0..94       # there are maximum 95 slots + md5 (0xC00)
+      var item_raw = self.raw[i*32..(i+1)*32-1]
+      var magic = item_raw.get(0,2)
+      if magic == 0x50AA    #- partition entry -#
+        var slot = partition.Partition_info(item_raw)
+        self.slots.push(slot)
+      elif magic == 0xEBEB  #- MD5 -#
+        self.md5 = self.raw[i*32+16..i*33-1]
+        break
+      else
+        break
+      end
+    end
+  end
+
+  def get_ota_slot(n)
+    for slot: self.slots
+      if slot.is_ota() == n return slot end
+    end
+    return nil
+  end
+
+  #- compute the highest ota<x> partition -#
+  def ota_max()
+    var ota_max = 0
+    for slot:self.slots
+      if slot.type == 0 && (slot.subtype >= 0x10 && slot.subtype < 0x20)
+        var ota_num = slot.subtype - 0x10
+        if ota_num > ota_max  ota_max = ota_num end
+      end
+    end
+    return ota_max
+  end
+
+  def load_otadata()
+    #- look for otadata partition offset, and max_ota -#
+    var otadata_offset = 0xE000   #- default value -#
+    var ota_max = self.ota_max()
+    for slot:self.slots
+      if slot.type == 1 && slot.subtype == 0    #- otadata -#
+        otadata_offset = slot.start
+      end
+    end
+
+    self.otadata = partition.Partition_otadata(ota_max, otadata_offset)
+  end
+
+  # get the active OTA app partition number
+  def get_active()
+    return self.otadata.active_otadata
+  end
+
+  #- change the active partition -#
+  def set_active(n)
+    if n < 0 || n > self.ota_max()  raise "value_error", "Invalid ota partition number" end
+    self.otadata.set_ota_max(self.ota_max())    #- update ota_max if it changed -#
+    self.otadata.set_active(n)
+  end
+
+  # Human readable version of Partition information
+  # this method is not included in the solidified version to save space,
+  # it is included only in the optional application `tapp` version
+  #- convert to human readble -#
+  def tostring()
+    var ret = "<instance: Partition([\n"
+    for slot: self.slots
+      ret += "  "
+      ret += slot.tostring()
+      ret += "\n"
+    end
+    ret += "],\n  "
+    ret += self.otadata.tostring()
+    ret += "\n)>"
+    return ret
+  end
+
+  #- convert the slots to raw bytes, ready to falsh to parition page -#
+  def tobytes()
+    if size(self.slots) > 95 raise "value_error", "Too many partiition slots" end
+    var b = bytes()
+    for slot: self.slots
+      b += slot.tobytes()
+    end
+    #- compute MD5 -#
+    var md5 = MD5()
+    md5.update(b)
+    #- add the last segment -#
+    b += bytes("EBEBFFFFFFFFFFFFFFFFFFFFFFFFFFFF")
+    b += md5.finish()
+    #- complete -#
+    return b
+  end
+
+  #- write back to flash -#
+  def save()
+    import flash
+    var b = self.tobytes()
+    #- erase flash area and write -#
+    flash.erase(0x8000, 0x1000)
+    flash.write(0x8000, b)
+    self.otadata.save()
+  end
+
+  #- invalidate SPIFFS partition to force format at next boot -#
+  #- we simply erase the first byte of the first 2 blocks in the SPIFFS partition -#
+  def invalidate_spiffs()
+    import flash
+    #- we expect the SPIFFS partition to be the last one -#
+    var spiffs = self.slots[-1]
+    if !spiffs.is_spiffs() raise 'value_error', 'No SPIFFS partition found' end
+
+    var b = bytes("00")  #- flash memory: we can turn bits from '1' to '0' -#
+    flash.write(spiffs.start         , b)    #- block #0 -#
+    flash.write(spiffs.start + 0x1000, b)    #- block #1 -#
+  end  
+end
+partition.Partition = Partition
+
+return partition
+
+#- Example
+
+import partition
+
+# read
+p = partition.Partition()
+print(p)
+
+-#