diff --git a/book.c b/book.c
index 90bfd3f..9014079 100644
--- a/book.c
+++ b/book.c
@@ -263,14 +263,16 @@ static void subbook_encode(json_t* subbook_json, const Book_Subbook* subbook, in
         json_object_set_new(subbook_json, "fonts", font_json_array);
     }
 
-    json_t* entry_json_array = json_array();
-    for (int i = 0; i < subbook->entry_count; ++i) {
-        json_t* entry_json = json_object();
-        entry_encode(entry_json, subbook->entries + i, flags);
-        json_array_append_new(entry_json_array, entry_json);
-    }
+    if (flags & FLAG_ENTRIES) {
+        json_t* entry_json_array = json_array();
+        for (int i = 0; i < subbook->entry_count; ++i) {
+            json_t* entry_json = json_object();
+            entry_encode(entry_json, subbook->entries + i, flags);
+            json_array_append_new(entry_json_array, entry_json);
+        }
 
-    json_object_set_new(subbook_json, "entries", entry_json_array);
+        json_object_set_new(subbook_json, "entries", entry_json_array);
+    }
 }
 
 static void book_encode(json_t* book_json, const Book* book, int flags) {
@@ -367,7 +369,7 @@ static void subbook_font_import(Book_Font* font, EB_Book* eb_book, EB_Font_Code
 
             Book_Glyph* glyph = glyph_set->glyphs + glyph_set->count;
             glyph->code = font_code;
-            memset(glyph->bitmap, 0, sizeof(glyph->bitmap));
+            memset(glyph->bitmap, 0, glyph_set->bitmap_size);
             if (eb_narrow_font_character_bitmap(eb_book, font_code, glyph->bitmap) != EB_SUCCESS) {
                 break;
             }
@@ -422,7 +424,7 @@ static void subbook_font_import(Book_Font* font, EB_Book* eb_book, EB_Font_Code
 
             Book_Glyph* glyph = glyph_set->glyphs + glyph_set->count;
             glyph->code = font_code;
-            memset(glyph->bitmap, 0, sizeof(glyph->bitmap));
+            memset(glyph->bitmap, 0, glyph_set->bitmap_size);
             if (eb_wide_font_character_bitmap(eb_book, font_code, glyph->bitmap) != EB_SUCCESS) {
                 break;
             }
@@ -450,19 +452,20 @@ static void subbook_import(Book_Subbook* subbook, EB_Book* eb_book, EB_Hookset*
         }
     }
 
-    if (eb_search_all_alphabet(eb_book) == EB_SUCCESS) {
-        subbook_entries_import(subbook, eb_book, eb_hookset);
+    if (flags & FLAG_ENTRIES) {
+        if (eb_search_all_alphabet(eb_book) == EB_SUCCESS) {
+            subbook_entries_import(subbook, eb_book, eb_hookset);
+        }
+
+        if (eb_search_all_kana(eb_book) == EB_SUCCESS) {
+            subbook_entries_import(subbook, eb_book, eb_hookset);
+        }
+
+        if (eb_search_all_asis(eb_book) == EB_SUCCESS) {
+            subbook_entries_import(subbook, eb_book, eb_hookset);
+        }
     }
 
-    if (eb_search_all_kana(eb_book) == EB_SUCCESS) {
-        subbook_entries_import(subbook, eb_book, eb_hookset);
-    }
-
-    if (eb_search_all_asis(eb_book) == EB_SUCCESS) {
-        subbook_entries_import(subbook, eb_book, eb_hookset);
-    }
-
-    memset(subbook->fonts, 0, sizeof(subbook->fonts));
     if (flags & FLAG_FONTS) {
         const EB_Font_Code codes[] = {EB_FONT_16, EB_FONT_24, EB_FONT_30, EB_FONT_48};
         for (unsigned i = 0; i < ARRSIZE(codes); ++i) {
diff --git a/main.c b/main.c
index ccb4c6f..8ea78ce 100644
--- a/main.c
+++ b/main.c
@@ -36,6 +36,7 @@ int main(int argc, char *argv[]) {
         { "markup",    no_argument, NULL, 'm' },
         { "positions", no_argument, NULL, 's' },
         { "fonts",     no_argument, NULL, 'f' },
+        { "entries",   no_argument, NULL, 'e' },
         { NULL,        0,           NULL,  0  },
     };
 
@@ -57,6 +58,9 @@ int main(int argc, char *argv[]) {
             case 'f':
                 flags |= FLAG_FONTS;
                 break;
+            case 'e':
+                flags |= FLAG_ENTRIES;
+                break;
             default:
                 return 1;
         }
diff --git a/util.h b/util.h
index 38c2c93..21418fb 100644
--- a/util.h
+++ b/util.h
@@ -34,6 +34,7 @@ enum {
     FLAG_HOOK_MARKUP  = 1 << 1,
     FLAG_POSITIONS    = 1 << 2,
     FLAG_FONTS        = 1 << 3,
+    FLAG_ENTRIES      = 1 << 4,
 };
 
 #endif /* UTIL_H */