diginext-utils/esm/string/guessMimeTypeByBuffer.js

README.md

export default function guessMimeTypeByBuffer(buffer) {
    const signature = buffer.toString("hex", 0, 4);
    switch (signature) {
        case "89504e47":
            return "image/png";
        case "47494638":
            return "image/gif";
        case "52494646": {
            const webpSignature = buffer.toString("hex", 8, 12);
            if (webpSignature === "57454250") {
                return "image/webp";
            }
            break;
        }
        // MP4, MOV, and other video formats can have multiple signatures
        case "00000018":
        case "0000001c":
        case "00000020":
            return "video/mp4";
        case "66747970":
            return "video/quicktime"; // MOV
        case "1a45dfa3": // This is the start of an EBML document (used in WebM, MKV)
            return "video/webm";
        case "000001ba":
        case "000001b3":
            return "video/mpeg";
        // Add more cases as needed
        default:
            // Check for JPEG signatures
            if (signature.startsWith("ffd8ff")) {
                return "image/jpeg";
            }
            return "unknown";
    }
    return "unknown";
}
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