image-in-browser/lib/formats/bmp/bmp-file-header.js

Package for encoding / decoding images, transforming images, applying filters, drawing primitives on images on the client side (no need for server Node.js)

import { InputBuffer } from '../../common/input-buffer.js';
import { LibError } from '../../error/lib-error.js';
export class BmpFileHeader {
    get fileLength() {
        return this._fileLength;
    }
    set imageOffset(v) {
        this._imageOffset = v;
    }
    get imageOffset() {
        return this._imageOffset;
    }
    constructor(b) {
        if (!BmpFileHeader.isValidFile(b)) {
            throw new LibError('Not a bitmap file.');
        }
        b.skip(2);
        this._fileLength = b.readInt32();
        b.skip(4);
        this._imageOffset = b.readInt32();
    }
    static isValidFile(b) {
        if (b.length < 2) {
            return false;
        }
        const type = InputBuffer.from(b).readUint16();
        return type === BmpFileHeader.signature;
    }
}
BmpFileHeader.signature = 0x4d42;
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