widauerdev/vcfsplit.html at master · a-ctor/widauerdev · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Vcf-split</title>
</head>
<body>
    <h1>VCF Splitter</h1>
    <p>Split a VCF file into multiple VCF files</p>
    <p>Just drag and drop a file on the page or choose it via picker below.</p>
    <input id="fileInput" type="file" value="here" accept=".vcf,text/vcard" multiple="false" />
    <script src="crc32.js"></script>
    <script src="save.js"></script>
    <script src="zip.js"></script>
    <script>
        Uint8Array.prototype.indexOf = function(data, index) {
            if (data.length === 0)
                throw "Search array cannot be empty.";
            if (index < 0)
                return -1;

            let j = 0;
            for (let i = index || 0; i < this.length; i++) {
                if (this[i] === data[j]) {
                    j++;
                    if (data.length == j)
                        return i - j + 1;
                } else {
                    j = 0;
                }
            }

            return -1;
        }

        const endMarker = [0x45, 0x4E, 0x44, 0x3A, 0x56, 0x43, 0x41, 0x52, 0x44];
        const nameMarker = [0x0A, 0x4E, 0x3A];
        const newlineMarker = [0x0A];

        const utf8Encoder = new TextEncoder();
        const utf8Decoder = new TextDecoder();

        async function parseFile(file) {
            const bytes = new Uint8Array(await file.arrayBuffer());
            const files = [];

            const usedFileNames = new Set();
            usedFileNames.add("");

            let from = 0, to = 0;
            while ((to = bytes.indexOf(endMarker, from)) !== -1) {
                to += endMarker.length;

                const fileData = bytes.slice(from, to);

                // Try to determine the file name
                let name = "";
                const nameStart = fileData.indexOf(nameMarker);
                if (nameStart !== -1) {
                    const nameEnd = fileData.indexOf(newlineMarker, nameStart + nameMarker.length);
                    if (nameEnd !== -1) {
                        const nameUnescaped = utf8Decoder.decode(fileData.slice(nameStart + nameMarker.length, nameEnd)).trim();
                        name = nameUnescaped.replace(/[^a-z0-9]/gi, "_");
                        name = name.replace(/_{2,}/g, "_");
                        name = name.replace(/_$/g, "");
                    }
                }

                // Make sure the filename is unique
                if (usedFileNames.has(name)) {
                    let originalName = name;

                    let i = 1;
                    do {
                        i++;
                        name = originalName + i;
                    } while (usedFileNames.has(name));
                }
                usedFileNames.add(name);

                name = name + ".vcf";
                files.push({
                    name,
                    nameData: utf8Encoder.encode(name),
                    fileData
                });

                // Skip newline
                if (bytes[to] === 0x0D)
                    to++;
                if (bytes[to] === 0x0A)
                    to++;

                from = to;
            }

            return files;
        }

        const fileInput = document.getElementById("fileInput");
        fileInput.addEventListener("change", async ev => {
            const files = fileInput.files;
            if (files.length === 0)
                return;

            const parts = await parseFile(files[0]);
            console.info(parts);

            const zip = createZip(parts);

            saveAs(zip, "results.zip", "application/zip");

            fileInput.value = null;
        })
    </script>
</body>
</html>