diff --git a/src/utils/common.ts b/src/utils/common.ts
index 610e201c..8006a5ef 100644
--- a/src/utils/common.ts
+++ b/src/utils/common.ts
@@ -1620,3 +1620,85 @@ export const langToName = (lang: string) => {
     );
   }
 };
+export const getBookPartialMd5 = async (book: Book) => {
+  if (isElectron) {
+    const fs = window.require("fs");
+    const crypto = window.require("crypto");
+    function partialMD5(filepath) {
+      if (!filepath) return;
+
+      try {
+        const fd = fs.openSync(filepath, "r");
+        const step = 1024;
+        const size = 1024;
+        const hash = crypto.createHash("md5");
+        const buffer = Buffer.alloc(size);
+
+        for (let i = -1; i <= 10; i++) {
+          const position = step << (2 * i);
+
+          try {
+            const bytesRead = fs.readSync(fd, buffer, 0, size, position);
+            if (bytesRead > 0) {
+              hash.update(buffer.slice(0, bytesRead));
+            } else {
+              break;
+            }
+          } catch (err) {
+            break;
+          }
+        }
+
+        fs.closeSync(fd);
+        return hash.digest("hex");
+      } catch (err) {
+        return;
+      }
+    }
+    let filePath = BookUtil.getBookPath(book);
+    if (!filePath) {
+      return null;
+    }
+    return partialMD5(filePath);
+  } else {
+    function partialMD5(arrayBuffer) {
+      if (!arrayBuffer) return;
+
+      const step = 1024;
+      const size = 1024;
+      const fileSize = arrayBuffer.byteLength;
+      const hash = CryptoJS.algo.MD5.create();
+
+      for (let i = -1; i <= 10; i++) {
+        const position = step << (2 * i);
+
+        if (position >= fileSize) {
+          break;
+        }
+
+        const endPosition = Math.min(position + size, fileSize);
+        const chunk = arrayBuffer.slice(position, endPosition);
+
+        if (chunk.byteLength > 0) {
+          // 将 ArrayBuffer 转换为 WordArray
+          const wordArray = CryptoJS.lib.WordArray.create(
+            new Uint8Array(chunk)
+          );
+          hash.update(wordArray);
+        } else {
+          break;
+        }
+      }
+
+      return hash.finalize().toString();
+    }
+    let bookBuffer = await BookUtil.fetchBook(
+      book.key,
+      book.format.toLowerCase(),
+      true,
+      book.path
+    );
+    const md5 = partialMD5(bookBuffer);
+    return md5;
+  }
+};
diff --git a/src/utils/file/koReaderSync.ts b/src/utils/file/koReaderSync.ts
index 55710b4e..3665c89f 100644
--- a/src/utils/file/koReaderSync.ts
+++ b/src/utils/file/koReaderSync.ts
@@ -5,8 +5,7 @@ import {
 import Book from "../../models/Book";
 import DatabaseService from "../storage/databaseService";
 import CryptoJS from "crypto-js";
-import { isElectron } from "react-device-detect";
-import BookUtil from "./bookUtil";
+import { getBookPartialMd5 } from "../common";
 
 const KO_READER_DEVICE_NAME = "Koodo Reader";
 const KO_READER_ACCEPT = "application/vnd.koreader.v1+json";
@@ -408,85 +407,3 @@ export const syncKOReaderProgress = async (): Promise<KOReaderSyncSummary> => {
 
   return summary;
 };
-export const getBookPartialMd5 = async (book: Book) => {
-  if (isElectron) {
-    const fs = window.require("fs");
-    const crypto = window.require("crypto");
-    function partialMD5(filepath) {
-      if (!filepath) return;
-
-      try {
-        const fd = fs.openSync(filepath, "r");
-        const step = 1024;
-        const size = 1024;
-        const hash = crypto.createHash("md5");
-        const buffer = Buffer.alloc(size);
-
-        for (let i = -1; i <= 10; i++) {
-          const position = step << (2 * i);
-
-          try {
-            const bytesRead = fs.readSync(fd, buffer, 0, size, position);
-            if (bytesRead > 0) {
-              hash.update(buffer.slice(0, bytesRead));
-            } else {
-              break;
-            }
-          } catch (err) {
-            break;
-          }
-        }
-
-        fs.closeSync(fd);
-        return hash.digest("hex");
-      } catch (err) {
-        return;
-      }
-    }
-    let filePath = BookUtil.getBookPath(book);
-    if (!filePath) {
-      return null;
-    }
-    return partialMD5(filePath);
-  } else {
-    function partialMD5(arrayBuffer) {
-      if (!arrayBuffer) return;
-
-      const step = 1024;
-      const size = 1024;
-      const fileSize = arrayBuffer.byteLength;
-      const hash = CryptoJS.algo.MD5.create();
-
-      for (let i = -1; i <= 10; i++) {
-        const position = step << (2 * i);
-
-        if (position >= fileSize) {
-          break;
-        }
-
-        const endPosition = Math.min(position + size, fileSize);
-        const chunk = arrayBuffer.slice(position, endPosition);
-
-        if (chunk.byteLength > 0) {
-          // 将 ArrayBuffer 转换为 WordArray
-          const wordArray = CryptoJS.lib.WordArray.create(
-            new Uint8Array(chunk)
-          );
-          hash.update(wordArray);
-        } else {
-          break;
-        }
-      }
-
-      return hash.finalize().toString();
-    }
-    let bookBuffer = await BookUtil.fetchBook(
-      book.key,
-      book.format.toLowerCase(),
-      true,
-      book.path
-    );
-    const md5 = partialMD5(bookBuffer);
-    return md5;
-  }
-};