Move instance pointer to lzss_download function

Author: pennam

src/Arduino_ESP32_OTA.cpp

@@ -26,26 +26,6 @@
 #include "decompress/utility.h"
 #include "esp_ota_ops.h"
 
-/* Used to bind local module function to actual class instance */
-static Arduino_ESP32_OTA * _esp_ota_obj_ptr = 0;
-
-/******************************************************************************
-   LOCAL MODULE FUNCTIONS
- ******************************************************************************/
-
-static uint8_t read_byte() {
-  if(_esp_ota_obj_ptr) {
-    return _esp_ota_obj_ptr->read_byte_from_network();
-  }
-  return -1;
-}
-
-static void write_byte(uint8_t data) {
-  if(_esp_ota_obj_ptr) {
-    _esp_ota_obj_ptr->write_byte_to_flash(data);
-  }
-}
-
 /******************************************************************************
    CTOR/DTOR
  ******************************************************************************/
@@ -67,7 +47,6 @@ Arduino_ESP32_OTA::Arduino_ESP32_OTA()
 
 Arduino_ESP32_OTA::Error Arduino_ESP32_OTA::begin()
 {
-  _esp_ota_obj_ptr = this;
 
   /* ... initialize CRC ... */
   _crc32 = 0xFFFFFFFF;
@@ -273,7 +252,7 @@ int Arduino_ESP32_OTA::download(const char * ota_url)
   _crc32 = crc_update(_crc32, &_ota_header.header.magic_number, 12);
 
   /* Download and decode OTA file */
-  _ota_size = lzss_download(read_byte, write_byte, content_length_val - sizeof(_ota_header));
+  _ota_size = lzss_download(this, content_length_val - sizeof(_ota_header));
 
   if(_ota_size <= content_length_val - sizeof(_ota_header))
   {

src/Arduino_ESP32_OTA.h

@@ -42,13 +42,6 @@ static uint32_t const ARDUINO_ESP32_OTA_HTTP_HEADER_RECEIVE_TIMEOUT_ms = 10000;
 static uint32_t const ARDUINO_ESP32_OTA_BINARY_HEADER_RECEIVE_TIMEOUT_ms = 10000;
 static uint32_t const ARDUINO_ESP32_OTA_BINARY_BYTE_RECEIVE_TIMEOUT_ms = 2000;
 
-/******************************************************************************
- * TYPEDEF
- ******************************************************************************/
-
-typedef uint8_t(*ArduinoEsp32OtaReadByteFuncPointer)(void);
-typedef void(*ArduinoEsp32OtaWriteByteFuncPointer)(uint8_t);
-
 /******************************************************************************
  * CLASS DECLARATION
  ******************************************************************************/

src/decompress/lzss.cpp

@@ -22,9 +22,10 @@
    GLOBAL VARIABLES
  **************************************************************************************/
 
+/* Used to bind local module function to actual class instance */
+static Arduino_ESP32_OTA * esp_ota_obj_ptr = 0;
+
 static size_t LZSS_FILE_SIZE = 0;
-static ArduinoEsp32OtaReadByteFuncPointer read_byte_fptr = 0;
-static ArduinoEsp32OtaWriteByteFuncPointer write_byte_fptr = 0;
 
 int bit_buffer = 0, bit_mask = 128;
 unsigned char buffer[N * 2];
@@ -38,7 +39,7 @@ static size_t bytes_read_fgetc = 0;
 
 void lzss_fputc(int const c)
 {
-  write_byte_fptr((uint8_t)c);
+  esp_ota_obj_ptr->write_byte_to_flash((uint8_t)c);
 
   /* write byte callback */
   bytes_written_fputc++;
@@ -56,7 +57,7 @@ int lzss_fgetc()
     return LZSS_EOF;
 
   /* read byte callback */
-  uint8_t const c = read_byte_fptr();
+  uint8_t const c = esp_ota_obj_ptr->read_byte_from_network();
   bytes_read_fgetc++;
 
   return c;
@@ -157,10 +158,9 @@ void lzss_decode(void)
    PUBLIC FUNCTIONS
  **************************************************************************************/
 
-int lzss_download(ArduinoEsp32OtaReadByteFuncPointer read_byte, ArduinoEsp32OtaWriteByteFuncPointer write_byte, size_t const lzss_file_size)
+int lzss_download(Arduino_ESP32_OTA * instance, size_t const lzss_file_size)
 {
-  read_byte_fptr = read_byte;
-  write_byte_fptr = write_byte;
+  esp_ota_obj_ptr = instance;
   LZSS_FILE_SIZE = lzss_file_size;
   bytes_written_fputc = 0;
   bytes_read_fgetc = 0;

src/decompress/lzss.h

@@ -11,6 +11,6 @@
    FUNCTION DEFINITION
  **************************************************************************************/
 
-int lzss_download(ArduinoEsp32OtaReadByteFuncPointer read_byte, ArduinoEsp32OtaWriteByteFuncPointer write_byte, size_t const lzss_file_size);
+int lzss_download(Arduino_ESP32_OTA * instance, size_t const lzss_file_size);
 
 #endif /* SSU_LZSS_H_ */