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Runtime error
Runtime error
File size: 2,129 Bytes
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"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;
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