emunand: Add multipart support for rawnand images in fusee

fusee/fusee-secondary/src/gpt.c

@@ -112,3 +112,42 @@ int gpt_iterate_through_entries(FILE *disk, size_t sector_size, gpt_entry_iterat
 
     return 0;
 }
+
+int gpt_iterate_through_emu_entries(FILE *disk, size_t sector_size, gpt_emu_entry_iterator_t callback, void *param, const char *origin_path, bool is_multipart, int num_parts, uint64_t part_limit) {
+    efi_header_t hdr;
+    efi_entry_t entry;
+    size_t offset = 2 * 512; /* Sector #2. */
+    size_t delta;
+
+    /* Get the header. */
+    if (gpt_get_header(&hdr, disk, sector_size) == -1) {
+        return -1;
+    }
+
+    /* Seek to the entry table. */
+    if (fseek(disk, sector_size * hdr.entries_first_lba - offset, SEEK_CUR) != 0) {
+        return -1;
+    }
+
+    offset = sector_size * hdr.entries_first_lba;
+    delta = hdr.entry_size - sizeof(efi_entry_t);
+
+    /* Iterate through the entries. */
+    for (uint32_t i = 0; i < hdr.entry_count; i++) {
+        if (!fread(&entry, sizeof(efi_entry_t), 1, disk)) {
+            return -1;
+        }
+
+        if (callback(&entry, param, offset, disk, origin_path, is_multipart, num_parts, part_limit) != 0) {
+            return -1;
+        }
+
+        if (delta != 0 && fseek(disk, delta, SEEK_CUR) != 0) {
+            return -1;
+        }
+
+        offset += hdr.entry_size;
+    }
+
+    return 0;
+}