feat: init

node_modules/magic-bytes.js/dist/index.js

@@ -0,0 +1,60 @@
+"use strict";
+var __importDefault = (this && this.__importDefault) || function (mod) {
+    return (mod && mod.__esModule) ? mod : { "default": mod };
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.filetypeextension = exports.filetypemime = exports.filetypename = exports.filetypeinfo = void 0;
+const pattern_tree_1 = __importDefault(require("./model/pattern-tree"));
+const toHex_1 = require("./model/toHex");
+const patternTree = pattern_tree_1.default();
+const filetypeinfo = (bytes) => {
+    let tree = patternTree;
+    for (const k of Object.keys(tree.offset)) {
+        const offset = toHex_1.fromHex(k);
+        const offsetExceedsFile = offset >= bytes.length;
+        if (offsetExceedsFile) {
+            continue;
+        }
+        const node = patternTree.offset[k];
+        const guessed = walkTree(offset, bytes, node);
+        if (guessed.length > 0) {
+            return guessed;
+        }
+    }
+    if (tree.noOffset === null) {
+        return [];
+    }
+    return walkTree(0, bytes, tree.noOffset);
+};
+exports.filetypeinfo = filetypeinfo;
+const walkTree = (index, bytes, node) => {
+    let step = node;
+    let guessFile = [];
+    while (true) {
+        const currentByte = toHex_1.toHex(bytes[index]);
+        if (step.bytes["?"] && !step.bytes[currentByte]) {
+            step = step.bytes["?"];
+        }
+        else {
+            step = step.bytes[currentByte];
+        }
+        if (!step) {
+            return guessFile;
+        }
+        if (step && step.matches) {
+            guessFile = step.matches.slice(0);
+        }
+        index += 1;
+    }
+};
+exports.default = exports.filetypeinfo;
+const filetypename = (bytes) => exports.filetypeinfo(bytes).map((e) => e.typename);
+exports.filetypename = filetypename;
+const filetypemime = (bytes) => exports.filetypeinfo(bytes)
+    .map((e) => (e.mime ? e.mime : null))
+    .filter((x) => x !== null);
+exports.filetypemime = filetypemime;
+const filetypeextension = (bytes) => exports.filetypeinfo(bytes)
+    .map((e) => (e.extension ? e.extension : null))
+    .filter((x) => x !== null);
+exports.filetypeextension = filetypeextension;