@struktoai/mirage-core/dist/commands/builtin/file_sniff.js

A Unified Virtual Filesystem For AI Agents

// ========= Copyright 2026 @ Strukto.AI All Rights Reserved. =========
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// ========= Copyright 2026 @ Strukto.AI All Rights Reserved. =========
import { ContentType } from "../../types.js";
import { FILE_MIME_MAP, MAGIC_SIGNATURES } from "./constants.js";
export function detectFileType(header, stat) {
    if (stat.content !== null && stat.content !== ContentType.BINARY)
        return stat.content;
    for (const [sig, ftype] of MAGIC_SIGNATURES) {
        if (startsWith(header, sig))
            return ftype;
    }
    const sample = header.subarray(0, 256);
    let printable = true;
    for (const b of sample) {
        if (b !== 0 && b >= 128) {
            printable = false;
            break;
        }
    }
    return printable ? ContentType.TEXT : ContentType.BINARY;
}
function startsWith(data, sig) {
    if (data.byteLength < sig.length)
        return false;
    for (let i = 0; i < sig.length; i++) {
        if (data[i] !== sig[i])
            return false;
    }
    return true;
}
export function formatFileResult(pathOriginal, 
// A ContentType or FileType, or a ready-made description (a symlink
// line) that passes through as-is. Both are string unions, so one
// `string` covers all three.
result, brief, mime) {
    const key = result;
    const desc = mime ? (FILE_MIME_MAP[key] ?? key) : key;
    return brief ? desc : `${pathOriginal}: ${desc}`;
}
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