nyx: part: extend Fix Hybrid MBR/GPT functionality

- Allow invalid/out-of-bounds and empty partitions to be removed from GPT
- Add fix for wrong emuMMC offset because of older bugged Android Dynamic scheme

nyx/nyx_gui/frontend/gui_tools_partition_manager.c

@@ -2616,7 +2616,7 @@ static void _create_mbox_check_files_total_size()
 	free(path);
 }
 
-static lv_res_t _action_fix_mbr(lv_obj_t *btn)
+static lv_res_t _action_fix_mbr_gpt(lv_obj_t *btn)
 {
 	lv_obj_t *dark_bg = lv_obj_create(lv_scr_act(), NULL);
 	lv_obj_set_style(dark_bg, &mbox_darken);
@@ -2639,6 +2639,8 @@ static lv_res_t _action_fix_mbr(lv_obj_t *btn)
 	bool has_mbr_attributes   = false;
 	bool hybrid_mbr_changed   = false;
 	bool gpt_partition_exists = false;
+	int  gpt_oob_empty_part_no = 0;
+	int  gpt_emummc_migrate_no = 0;
 
 	// Try to init sd card. No need for valid MBR.
 	if (!sd_mount() && !sd_get_card_initialized())
@@ -2684,10 +2686,16 @@ static lv_res_t _action_fix_mbr(lv_obj_t *btn)
 	LIST_INIT(gpt_parsed);
 	for (u32 i = 0; i < gpt->header.num_part_ents; i++)
 	{
-		emmc_part_t *part = (emmc_part_t *)zalloc(sizeof(emmc_part_t));
+		// Check if partition is out of bounds or empty.
-
+		if ( gpt->entries[i].lba_start <   gpt->header.first_use_lba ||
-		if (gpt->entries[i].lba_start < gpt->header.first_use_lba)
+			 gpt->entries[i].lba_start >=  gpt->entries[i].lba_end   ||
+			!gpt->entries[i].lba_end)
+		{
+			gpt_oob_empty_part_no++;
 			continue;
+		}
+
+		emmc_part_t *part = (emmc_part_t *)zalloc(sizeof(emmc_part_t));
 
 		part->index = i;
 		part->lba_start = gpt->entries[i].lba_start;
@@ -2704,6 +2712,7 @@ static lv_res_t _action_fix_mbr(lv_obj_t *btn)
 	// Set FAT and emuMMC partitions.
 	u32 mbr_idx = 1;
 	bool found_hos_data = false;
+	u32 emummc_mbr_part_idx[2] = {0};
 	LIST_FOREACH_ENTRY(emmc_part_t, part, &gpt_parsed, link)
 	{
 		// FatFS simple GPT found a fat partition, set it.
@@ -2711,7 +2720,7 @@ static lv_res_t _action_fix_mbr(lv_obj_t *btn)
 		{
 			mbr[1].partitions[0].type = sd_fs.fs_type == FS_EXFAT ? 0x7 : 0xC;
 			mbr[1].partitions[0].start_sct = part->lba_start;
-			mbr[1].partitions[0].size_sct = (part->lba_end - part->lba_start + 1);
+			mbr[1].partitions[0].size_sct  = part->lba_end - part->lba_start + 1;
 		}
 
 		// FatFS simple GPT didn't find a fat partition as the first one.
@@ -2719,7 +2728,7 @@ static lv_res_t _action_fix_mbr(lv_obj_t *btn)
 		{
 			mbr[1].partitions[0].type = 0xC;
 			mbr[1].partitions[0].start_sct = part->lba_start;
-			mbr[1].partitions[0].size_sct = (part->lba_end - part->lba_start + 1);
+			mbr[1].partitions[0].size_sct  = part->lba_end - part->lba_start + 1;
 			found_hos_data = true;
 		}
 
@@ -2728,7 +2737,11 @@ static lv_res_t _action_fix_mbr(lv_obj_t *btn)
 		{
 			mbr[1].partitions[mbr_idx].type = 0xE0;
 			mbr[1].partitions[mbr_idx].start_sct = part->lba_start;
-			mbr[1].partitions[mbr_idx].size_sct = (part->lba_end - part->lba_start + 1);
+			mbr[1].partitions[mbr_idx].size_sct  = part->lba_end - part->lba_start + 1;
+			if (!strcmp(part->name, "emummc"))
+				emummc_mbr_part_idx[0] = mbr_idx;
+			else
+				emummc_mbr_part_idx[1] = mbr_idx;
 			mbr_idx++;
 		}
 
@@ -2751,13 +2764,21 @@ static lv_res_t _action_fix_mbr(lv_obj_t *btn)
 			(mbr[0].partitions[i].start_sct != mbr[1].partitions[i].start_sct) ||
 			(mbr[0].partitions[i].size_sct  != mbr[1].partitions[i].size_sct))
 		{
+			// Check if original MBR already has an emuMMC and use it as source of truth.
+			if (mbr[0].partitions[i].type == 0xE0)
+			{
+				memcpy(&mbr[1].partitions[i], &mbr[0].partitions[i], sizeof(mbr_part_t));
+				gpt_emummc_migrate_no++;
+				continue;
+			}
+			else
 				hybrid_mbr_changed = true;
 			break;
 		}
 	}
 
 check_changes:
-	if (!hybrid_mbr_changed && !has_mbr_attributes)
+	if (!hybrid_mbr_changed && !has_mbr_attributes && !gpt_emummc_migrate_no)
 	{
 		lv_label_set_text(lbl_status, "#96FF00 Warning:# The Hybrid MBR needs no change!#");
 		goto out;
@@ -2765,6 +2786,8 @@ check_changes:
 
 	char *txt_buf = malloc(SZ_16K);
 
+	if (hybrid_mbr_changed)
+	{
 		// Current MBR info.
 		s_printf(txt_buf, "#00DDFF Current MBR Layout:#\n");
 		s_printf(txt_buf + strlen(txt_buf),
@@ -2788,6 +2811,17 @@ check_changes:
 			mbr[1].partitions[1].type, mbr[1].partitions[1].start_sct, mbr[1].partitions[1].size_sct,
 			mbr[1].partitions[2].type, mbr[1].partitions[2].start_sct, mbr[1].partitions[2].size_sct,
 			mbr[1].partitions[3].type, mbr[1].partitions[3].start_sct, mbr[1].partitions[3].size_sct);
+	}
+	else if (has_mbr_attributes || gpt_emummc_migrate_no || gpt_oob_empty_part_no)
+	{
+		s_printf(txt_buf, "#00DDFF The following need to be corrected:#\n");
+		if (has_mbr_attributes)
+			s_printf(txt_buf + strlen(txt_buf), "- MBR attributes\n");
+		if (gpt_emummc_migrate_no)
+			s_printf(txt_buf + strlen(txt_buf), "- emuMMC GPT Partition address and size\n");
+		if (gpt_oob_empty_part_no)
+			s_printf(txt_buf + strlen(txt_buf), "- GPT OOB/Empty Partitions (removal)\n");
+	}
 
 	lv_label_set_text(lbl_status, txt_buf);
 	lv_label_set_style(lbl_status, &monospace_text);
@@ -2809,6 +2843,8 @@ check_changes:
 
 	if (btn_wait() & BTN_POWER)
 	{
+		bool has_gpt_changes = false;
+
 		sd_mount();
 
 		// Write MBR.
@@ -2820,10 +2856,59 @@ check_changes:
 		{
 			// Clear secret attributes.
 			gpt->entries[0].part_guid[7] = 0;
+			has_gpt_changes = gpt_partition_exists;
 
-			if (gpt_partition_exists)
+			if (!has_gpt_changes)
 			{
-				// Fix CRC32s.
+				// Only write the relevant sector if the only change is MBR attributes.
+				sdmmc_storage_write(&sd_storage, 2, 1, &gpt->entries[0]);
+			}
+		}
+
+		if (gpt_emummc_migrate_no)
+		{
+			u32 emu_idx = 0;
+			for (u32 i = 0; i < gpt->header.num_part_ents; i++)
+			{
+				if (!memcmp(gpt->entries[i].name, (u16[]) { 'e', 'm', 'u', 'm', 'm', 'c' }, 12))
+				{
+					u32 idx = emummc_mbr_part_idx[emu_idx];
+					gpt->entries[i].lba_start = mbr[0].partitions[idx].start_sct;
+					gpt->entries[i].lba_end   = mbr[0].partitions[idx].start_sct + mbr[0].partitions[idx].size_sct - 1;
+					gpt_emummc_migrate_no--;
+					emu_idx++;
+
+					has_gpt_changes = true;
+				}
+
+				if (i > 126 || !gpt_emummc_migrate_no)
+					break;
+			}
+		}
+
+		if (gpt_oob_empty_part_no)
+		{
+			u32 part_idx = 0;
+			for (u32 i = 0; i < gpt->header.num_part_ents; i++)
+			{
+				if ( gpt->entries[i].lba_start <   gpt->header.first_use_lba ||
+					 gpt->entries[i].lba_start >=  gpt->entries[i].lba_end   ||
+					!gpt->entries[i].lba_end)
+				{
+					continue;
+				}
+
+				if (part_idx != i)
+					memcpy(&gpt->entries[part_idx], &gpt->entries[i], sizeof(gpt_entry_t));
+				part_idx++;
+			}
+			gpt->header.num_part_ents -= gpt_oob_empty_part_no;
+			has_gpt_changes = true;
+		}
+
+		if (has_gpt_changes)
+		{
+			// Fix GPT CRC32s.
 			u32 entries_size = sizeof(gpt_entry_t) * gpt->header.num_part_ents;
 			gpt->header.part_ents_crc32 = crc32_calc(0, (const u8 *)gpt->entries, entries_size);
 			gpt->header.crc32 = 0; // Set to 0 for calculation.
@@ -2843,12 +2928,6 @@ check_changes:
 			// Write backup GPT header.
 			sdmmc_storage_write(&sd_storage, gpt_hdr_backup.my_lba, 1, &gpt_hdr_backup);
 		}
-			else
-			{
-				// Only write the relevant sector if the only change is MBR attributes.
-				sdmmc_storage_write(&sd_storage, 2, 1, &gpt->entries[0]);
-			}
-		}
 
 		sd_unmount();
 
@@ -2875,7 +2954,7 @@ lv_res_t create_window_partition_manager(bool emmc)
 	if (!emmc)
 	{
 		win = nyx_create_standard_window(SYMBOL_SD" SD Partition Manager");
-		lv_win_add_btn(win, NULL, SYMBOL_MODULES_ALT" Fix Hybrid MBR", _action_fix_mbr);
+		lv_win_add_btn(win, NULL, SYMBOL_MODULES_ALT" Fix Hybrid MBR/GPT", _action_fix_mbr_gpt);
 	}
 	else
 		win = nyx_create_standard_window(SYMBOL_CHIP" eMMC Partition Manager");