Added ESP:: functions for sketch size (espressif#2028)

* Added ESP:: functions for sketch size

* Fixed free space name to match ESP8266

Author: lbernstone

cores/esp32/Esp.cpp

@@ -25,20 +25,11 @@
 #include <memory>
 #include <soc/soc.h>
 #include <soc/efuse_reg.h>
-
-/* Main header of binary image */
-typedef struct {
-    uint8_t magic;
-    uint8_t segment_count;
-    uint8_t spi_mode;      /* flash read mode (esp_image_spi_mode_t as uint8_t) */
-    uint8_t spi_speed: 4;  /* flash frequency (esp_image_spi_freq_t as uint8_t) */
-    uint8_t spi_size: 4;   /* flash chip size (esp_image_flash_size_t as uint8_t) */
-    uint32_t entry_addr;
-    uint8_t encrypt_flag;    /* encrypt flag */
-    uint8_t extra_header[15]; /* ESP32 additional header, unused by second bootloader */
-} esp_image_header_t;
-
-#define ESP_IMAGE_HEADER_MAGIC 0xE9
+#include <esp_partition.h>
+#include <esp_ota_ops.h>
+extern "C" {
+#include <esp_image_format.h>
+}
 
 /**
  * User-defined Literals
@@ -156,6 +147,31 @@ uint32_t EspClass::getMaxAllocPsram(void)
     return heap_caps_get_largest_free_block(MALLOC_CAP_SPIRAM);
 }
 
+static uint32_t sketchSize(sketchSize_t response) {
+    esp_image_metadata_t data;
+    const esp_partition_t *running = esp_ota_get_running_partition();
+    if (!running) return 0;
+    const esp_partition_pos_t running_pos  = {
+        .offset = running->address,
+        .size = running->size,
+    };
+    data.start_addr = running_pos.offset;
+    esp_image_load(ESP_IMAGE_VERIFY, &running_pos, &data);
+    if (response) {
+    return running_pos.size - data.image_len;
+    } else {
+    return data.image_len;
+    }
+}
+    
+uint32_t EspClass::getSketchSize () {
+    return sketchSize(SKETCH_SIZE_TOTAL);
+}
+
+uint32_t EspClass::getFreeSketchSpace () {
+    return sketchSize(SKETCH_SIZE_FREE);
+}
+
 uint8_t EspClass::getChipRevision(void)
 {
     esp_chip_info_t chip_info;

cores/esp32/Esp.h

@@ -50,6 +50,11 @@ typedef enum {
     FM_UNKNOWN = 0xff
 } FlashMode_t;
 
+typedef enum {
+    SKETCH_SIZE_TOTAL = 0,
+    SKETCH_SIZE_FREE = 1
+} sketchSize_t;
+
 class EspClass
 {
 public:
@@ -84,6 +89,9 @@ class EspClass
     uint32_t magicFlashChipSpeed(uint8_t byte);
     FlashMode_t magicFlashChipMode(uint8_t byte);
 
+    uint32_t getSketchSize();
+    uint32_t getFreeSketchSpace();
+
     bool flashEraseSector(uint32_t sector);
     bool flashWrite(uint32_t offset, uint32_t *data, size_t size);
     bool flashRead(uint32_t offset, uint32_t *data, size_t size);