image-size/dist/esm/types/jxl.js

get dimensions of any image file

import { JXLStream } from './jxl-stream.js';
import { findBox, toUTF8String } from './utils.js';
function extractCodestream(input) {
    const jxlcBox = findBox(input, 'jxlc', 0);
    if (jxlcBox) {
        return input.slice(jxlcBox.offset + 8, jxlcBox.offset + jxlcBox.size);
    }
    const partialStreams = extractPartialStreams(input);
    if (partialStreams.length > 0) {
        return concatenateCodestreams(partialStreams);
    }
    return undefined;
}
function extractPartialStreams(input) {
    const partialStreams = [];
    let offset = 0;
    while (offset < input.length) {
        const jxlpBox = findBox(input, 'jxlp', offset);
        if (!jxlpBox)
            break;
        if (jxlpBox.size < 12) {
            throw new TypeError('Invalid JXL');
        }
        partialStreams.push(input.slice(jxlpBox.offset + 12, jxlpBox.offset + jxlpBox.size));
        offset = jxlpBox.offset + jxlpBox.size;
    }
    return partialStreams;
}
function concatenateCodestreams(partialCodestreams) {
    const totalLength = partialCodestreams.reduce((acc, curr) => acc + curr.length, 0);
    const codestream = new Uint8Array(totalLength);
    let position = 0;
    for (const partial of partialCodestreams) {
        codestream.set(partial, position);
        position += partial.length;
    }
    return codestream;
}
export const JXL = {
    validate: (input) => {
        const boxType = toUTF8String(input, 4, 8);
        if (boxType !== 'JXL ')
            return false;
        const ftypBox = findBox(input, 'ftyp', 0);
        if (!ftypBox)
            return false;
        const brand = toUTF8String(input, ftypBox.offset + 8, ftypBox.offset + 12);
        return brand === 'jxl ';
    },
    calculate(input) {
        const codestream = extractCodestream(input);
        if (codestream)
            return JXLStream.calculate(codestream);
        throw new TypeError('Invalid JXL');
    },
};