image-in-browser/lib/src/exif/ifd-value/ifd-ifd-value.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 { IfdValue } from './ifd-value.js';
import { IfdValueType } from '../ifd-value-type.js';
import { LibError } from '../../error/lib-error.js';
export class IfdIfdValue extends IfdValue {
    get type() {
        return IfdValueType.ifd;
    }
    get length() {
        return 1;
    }
    constructor(value) {
        super();
        this._offset = value;
    }
    static data(data) {
        const value = data.readUint32();
        return new IfdIfdValue(value);
    }
    toInt(index = 0) {
        if (index !== 0) {
            throw new LibError('Ifd tags are required to have a single entry (the offset).');
        }
        return this._offset;
    }
    toData() {
        return Uint8Array.from([
            this._offset >> 24,
            this._offset >> 16,
            this._offset >> 8,
            this._offset,
        ]);
    }
    write(out) {
        out.writeUint32(this._offset);
    }
    setInt(v, index = 0) {
        if (index !== 0) {
            throw new LibError('Ifd tags are required to have a single entry (the offset).');
        }
        this._offset = v;
    }
    equals(other) {
        return (other instanceof IfdIfdValue &&
            this.length === other.length &&
            this._offset === other._offset);
    }
    clone() {
        return new IfdIfdValue(this._offset);
    }
    toString() {
        return this._offset.toString();
    }
}
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