Significantly improved performance when scanning for embedded files by implementing a fastcheck algorithm.

package-lock.json

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+      "resolved": "http://registry.npmjs.org/progress/-/progress-1.1.8.tgz",
       "integrity": "sha1-4mDHj2Fhzdmw5WzD4Khd4Xx6V74="
     },
     "promise-inflight": {
@@ -10098,13 +10098,13 @@
       "dependencies": {
         "async": {
           "version": "1.0.0",
-          "resolved": "https://registry.npmjs.org/async/-/async-1.0.0.tgz",
+          "resolved": "http://registry.npmjs.org/async/-/async-1.0.0.tgz",
           "integrity": "sha1-+PwEyjoTeErenhZBr5hXjPvWR6k=",
           "dev": true
         },
         "winston": {
           "version": "2.1.1",
-          "resolved": "https://registry.npmjs.org/winston/-/winston-2.1.1.tgz",
+          "resolved": "http://registry.npmjs.org/winston/-/winston-2.1.1.tgz",
           "integrity": "sha1-PJNJ0ZYgf9G9/51LxD73JRDjoS4=",
           "dev": true,
           "requires": {
@@ -10119,7 +10119,7 @@
           "dependencies": {
             "colors": {
               "version": "1.0.3",
-              "resolved": "https://registry.npmjs.org/colors/-/colors-1.0.3.tgz",
+              "resolved": "http://registry.npmjs.org/colors/-/colors-1.0.3.tgz",
               "integrity": "sha1-BDP0TYCWgP3rYO0mDxsMJi6CpAs=",
               "dev": true
             },
@@ -10342,7 +10342,7 @@
       "dependencies": {
         "pify": {
           "version": "2.3.0",
-          "resolved": "https://registry.npmjs.org/pify/-/pify-2.3.0.tgz",
+          "resolved": "http://registry.npmjs.org/pify/-/pify-2.3.0.tgz",
           "integrity": "sha1-7RQaasBDqEnqWISY59yosVMw6Qw=",
           "dev": true
         }
@@ -10531,7 +10531,7 @@
       "dependencies": {
         "jsesc": {
           "version": "0.5.0",
-          "resolved": "https://registry.npmjs.org/jsesc/-/jsesc-0.5.0.tgz",
+          "resolved": "http://registry.npmjs.org/jsesc/-/jsesc-0.5.0.tgz",
           "integrity": "sha1-597mbjXW/Bb3EP6R1c9p9w8IkR0=",
           "dev": true
         }
@@ -10582,7 +10582,7 @@
         },
         "htmlparser2": {
           "version": "3.3.0",
-          "resolved": "https://registry.npmjs.org/htmlparser2/-/htmlparser2-3.3.0.tgz",
+          "resolved": "http://registry.npmjs.org/htmlparser2/-/htmlparser2-3.3.0.tgz",
           "integrity": "sha1-zHDQWln2VC5D8OaFyYLhTJJKnv4=",
           "dev": true,
           "requires": {
@@ -10594,7 +10594,7 @@
         },
         "readable-stream": {
           "version": "1.0.34",
-          "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-1.0.34.tgz",
+          "resolved": "http://registry.npmjs.org/readable-stream/-/readable-stream-1.0.34.tgz",
           "integrity": "sha1-Elgg40vIQtLyqq+v5MKRbuMsFXw=",
           "dev": true,
           "requires": {
@@ -10704,7 +10704,7 @@
     },
     "require-uncached": {
       "version": "1.0.3",
-      "resolved": "https://registry.npmjs.org/require-uncached/-/require-uncached-1.0.3.tgz",
+      "resolved": "http://registry.npmjs.org/require-uncached/-/require-uncached-1.0.3.tgz",
       "integrity": "sha1-Tg1W1slmL9MeQwEcS5WqSZVUIdM=",
       "dev": true,
       "requires": {
@@ -10871,7 +10871,7 @@
     },
     "safe-regex": {
       "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/safe-regex/-/safe-regex-1.1.0.tgz",
+      "resolved": "http://registry.npmjs.org/safe-regex/-/safe-regex-1.1.0.tgz",
       "integrity": "sha1-QKNmnzsHfR6UPURinhV91IAjvy4=",
       "dev": true,
       "requires": {
@@ -11191,7 +11191,7 @@
     },
     "sha.js": {
       "version": "2.4.11",
-      "resolved": "https://registry.npmjs.org/sha.js/-/sha.js-2.4.11.tgz",
+      "resolved": "http://registry.npmjs.org/sha.js/-/sha.js-2.4.11.tgz",
       "integrity": "sha512-QMEp5B7cftE7APOjk5Y6xgrbWu+WkLVQwk8JNjZ8nKRciZaByEW6MubieAiToS7+dwvrjGhH8jRXz3MVd0AYqQ==",
       "dev": true,
       "requires": {
@@ -11235,7 +11235,7 @@
     },
     "shelljs": {
       "version": "0.3.0",
-      "resolved": "https://registry.npmjs.org/shelljs/-/shelljs-0.3.0.tgz",
+      "resolved": "http://registry.npmjs.org/shelljs/-/shelljs-0.3.0.tgz",
       "integrity": "sha1-NZbmMHp4FUT1kfN9phg2DzHbV7E=",
       "dev": true
     },
@@ -11913,7 +11913,7 @@
     },
     "strip-ansi": {
       "version": "3.0.1",
-      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
+      "resolved": "http://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
       "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
       "requires": {
         "ansi-regex": "^2.0.0"
@@ -11930,7 +11930,7 @@
     },
     "strip-eof": {
       "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/strip-eof/-/strip-eof-1.0.0.tgz",
+      "resolved": "http://registry.npmjs.org/strip-eof/-/strip-eof-1.0.0.tgz",
       "integrity": "sha1-u0P/VZim6wXYm1n80SnJgzE2Br8=",
       "dev": true
     },
@@ -12009,7 +12009,7 @@
     },
     "tar": {
       "version": "2.2.1",
-      "resolved": "https://registry.npmjs.org/tar/-/tar-2.2.1.tgz",
+      "resolved": "http://registry.npmjs.org/tar/-/tar-2.2.1.tgz",
       "integrity": "sha1-jk0qJWwOIYXGsYrWlK7JaLg8sdE=",
       "dev": true,
       "requires": {
@@ -12064,7 +12064,7 @@
     },
     "through": {
       "version": "2.3.8",
-      "resolved": "https://registry.npmjs.org/through/-/through-2.3.8.tgz",
+      "resolved": "http://registry.npmjs.org/through/-/through-2.3.8.tgz",
       "integrity": "sha1-DdTJ/6q8NXlgsbckEV1+Doai4fU=",
       "dev": true
     },
@@ -12758,7 +12758,7 @@
       "dependencies": {
         "async": {
           "version": "0.9.2",
-          "resolved": "https://registry.npmjs.org/async/-/async-0.9.2.tgz",
+          "resolved": "http://registry.npmjs.org/async/-/async-0.9.2.tgz",
           "integrity": "sha1-rqdNXmHB+JlhO/ZL2mbUx48v0X0=",
           "dev": true
         },
@@ -12784,7 +12784,7 @@
     },
     "valid-data-url": {
       "version": "0.1.6",
-      "resolved": "https://registry.npmjs.org/valid-data-url/-/valid-data-url-0.1.6.tgz",
+      "resolved": "http://registry.npmjs.org/valid-data-url/-/valid-data-url-0.1.6.tgz",
       "integrity": "sha512-FXg2qXMzfAhZc0y2HzELNfUeiOjPr+52hU1DNBWiJJ2luXD+dD1R9NA48Ug5aj0ibbxroeGDc/RJv6ThiGgkDw==",
       "dev": true
     },
@@ -12800,7 +12800,7 @@
     },
     "validator": {
       "version": "9.4.1",
-      "resolved": "https://registry.npmjs.org/validator/-/validator-9.4.1.tgz",
+      "resolved": "http://registry.npmjs.org/validator/-/validator-9.4.1.tgz",
       "integrity": "sha512-YV5KjzvRmSyJ1ee/Dm5UED0G+1L4GZnLN3w6/T+zZm8scVua4sOhYKWTUrKa0H/tMiJyO9QLHMPN+9mB/aMunA==",
       "dev": true
     },
@@ -13296,7 +13296,7 @@
     },
     "webpack-node-externals": {
       "version": "1.7.2",
-      "resolved": "https://registry.npmjs.org/webpack-node-externals/-/webpack-node-externals-1.7.2.tgz",
+      "resolved": "http://registry.npmjs.org/webpack-node-externals/-/webpack-node-externals-1.7.2.tgz",
       "integrity": "sha512-ajerHZ+BJKeCLviLUUmnyd5B4RavLF76uv3cs6KNuO8W+HuQaEs0y0L7o40NQxdPy5w0pcv8Ew7yPUAQG0UdCg==",
       "dev": true
     },
@@ -13450,14 +13450,14 @@
       "dependencies": {
         "async": {
           "version": "1.0.0",
-          "resolved": "https://registry.npmjs.org/async/-/async-1.0.0.tgz",
+          "resolved": "http://registry.npmjs.org/async/-/async-1.0.0.tgz",
           "integrity": "sha1-+PwEyjoTeErenhZBr5hXjPvWR6k=",
           "dev": true,
           "optional": true
         },
         "colors": {
           "version": "1.0.3",
-          "resolved": "https://registry.npmjs.org/colors/-/colors-1.0.3.tgz",
+          "resolved": "http://registry.npmjs.org/colors/-/colors-1.0.3.tgz",
           "integrity": "sha1-BDP0TYCWgP3rYO0mDxsMJi6CpAs=",
           "dev": true,
           "optional": true
@@ -13490,7 +13490,7 @@
     },
     "wrap-ansi": {
       "version": "2.1.0",
-      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-2.1.0.tgz",
+      "resolved": "http://registry.npmjs.org/wrap-ansi/-/wrap-ansi-2.1.0.tgz",
       "integrity": "sha1-2Pw9KE3QV5T+hJc8rs3Rz4JP3YU=",
       "dev": true,
       "requires": {

src/core/lib/FileType.mjs

@@ -128,17 +128,58 @@ export function scanForFileTypes(buf) {
 
         for (let i = 0; i < category.length; i++) {
             const filetype = category[i];
-            for (let pos = 0; pos < buf.length; pos++) {
-                if (signatureMatches(filetype.signature, buf, pos)) {
-                    foundFiles.push({
-                        offset: pos,
-                        fileDetails: filetype
-                    });
+            const sigs = filetype.signature.length ? filetype.signature : [filetype.signature];
+
+            sigs.forEach(sig => {
+                let pos = 0;
+                while ((pos = locatePotentialSig(buf, sig, pos)) >= 0) {
+                    if (signatureMatches(sig, buf, pos)) {
+                        foundFiles.push({
+                            offset: pos,
+                            fileDetails: filetype
+                        });
+                    }
+                    pos++;
                 }
-            }
+            });
         }
     }
-    return foundFiles;
+
+    // Return found files in order of increasing offset
+    return foundFiles.sort((a, b) => {
+        return a.offset - b.offset;
+    });
+}
+
+
+/**
+ * Fastcheck function to quickly scan the buffer for the first byte in a signature.
+ *
+ * @param {Uint8Array} buf - The buffer to search
+ * @param {Object} sig - A single signature object (Not an array of signatures)
+ * @param {number} offset - Where to start search from
+ * @returs {number} The position of the match or -1 if one cannot be found.
+ */
+function locatePotentialSig(buf, sig, offset) {
+    // Find values for first key and value in sig
+    const k = parseInt(Object.keys(sig)[0], 10);
+    const v = Object.values(sig)[0];
+    switch (typeof v) {
+        case "number":
+            return buf.indexOf(v, offset + k) - k;
+        case "object":
+            for (let i = offset + k; i < buf.length; i++) {
+                if (v.indexOf(buf[i]) >= 0) return i - k;
+            }
+            return -1;
+        case "function":
+            for (let i = offset + k; i < buf.length; i++) {
+                if (v(buf[i])) return i - k;
+            }
+            return -1;
+        default:
+            throw new Error("Unrecognised signature type");
+    }
 }
 
 
@@ -155,9 +196,15 @@ export function isType(type, buf) {
     if (!(types && types.length)) return false;
 
     if (typeof type === "string") {
-        return types[0].mime.startsWith(type) ? types[0].mime : false;
+        return types.reduce((acc, t) => {
+            const mime = t.mime.startsWith(type) ? t.mime : false;
+            return acc || mime;
+        }, false);
     } else if (type instanceof RegExp) {
-        return type.test(types[0].mime) ? types[0].mime : false;
+        return types.reduce((acc, t) => {
+            const mime = type.test(t.mime) ? t.mime : false;
+            return acc || mime;
+        }, false);
     } else {
         throw new Error("Invalid type input.");
     }