Removed file-type dependency per #711 (#775)

package.json

@@ -63,7 +63,6 @@
   },
   "dependencies": {
     "bmp-js": "^0.1.0",
-    "file-type": "^12.4.2",
     "idb-keyval": "^6.2.0",
     "is-electron": "^2.2.2",
     "is-url": "^1.2.4",

src/worker-script/index.js

@@ -8,7 +8,6 @@
  * @author Jerome Wu <jeromewus@gmail.com>
  */
 require('regenerator-runtime/runtime');
-const fileType = require('file-type');
 const isURL = require('is-url');
 const dump = require('./utils/dump');
 const isWebWorker = require('../utils/getEnvironment')('type') === 'webworker';
@@ -125,8 +124,10 @@ res) => {
 
     data = new Uint8Array(data);
 
-    const type = fileType(data);
-    if (typeof type !== 'undefined' && type.mime === 'application/gzip') {
+    // Check for gzip magic numbers (1F and 8B in hex)
+    const isGzip = (data[0] === 31 && data[1] === 139) || (data[1] === 31 && data[0] === 139);
+
+    if (isGzip) {
       data = adapter.gunzip(data);
     }
 

src/worker-script/utils/setImage.js

@@ -1,5 +1,4 @@
 const bmp = require('bmp-js');
-const fileType = require('file-type');
 
 /**
  * setImage
@@ -9,7 +8,8 @@ const fileType = require('file-type');
  * @access public
  */
 module.exports = (TessModule, api, image, angle = 0) => {
-  const type = fileType(image);
+  // Check for bmp magic numbers (42 and 4D in hex)
+  const isBmp = (image[0] === 66 && image[1] === 77) || (image[1] === 66 && image[0] === 77);
 
   const exif = image.slice(0, 500).toString().match(/\x01\x12\x00\x03\x00\x00\x00\x01\x00(.)/)?.[1]?.charCodeAt(0) || 1;
 
@@ -18,7 +18,7 @@ module.exports = (TessModule, api, image, angle = 0) => {
   //  * @see https://github.com/DanBloomberg/leptonica/issues/607#issuecomment-1068802516
   //  * We therefore use bmp-js to convert all bmp files into a format Leptonica is known to support
   //  */
-  if (type && type.mime === 'image/bmp') {
+  if (isBmp) {
     // Not sure what this line actually does, but removing breaks the function
     const buf = Buffer.from(Array.from({ ...image, length: Object.keys(image).length }));
     const bmpBuf = bmp.decode(buf);