geotiff/dist-module/source/basesource.js

GeoTIFF image decoding in JavaScript

/**
 * @typedef {Object} Slice
 * @property {number} offset
 * @property {number} length
 */
/** @typedef {Slice & {data: ArrayBufferLike}} SliceWithData */
export class BaseSource {
    /**
     * @param {Array<Slice>} slices
     * @param {AbortSignal} [signal]
     * @returns {Promise<ArrayBufferLike[]>}
     */
    async fetch(slices, signal) {
        return Promise.all(slices.map(async (slice) => (await this.fetchSlice(slice, signal)).data));
    }
    /**
     * @param {Slice} slice
     * @param {AbortSignal} [_signal]
     * @returns {Promise<SliceWithData>}
     */
    async fetchSlice(slice, _signal) {
        throw new Error(`fetching of slice ${slice} not possible, not implemented`);
    }
    /**
     * Returns the filesize if already determined and null otherwise
     * @returns {number|null}
     */
    get fileSize() {
        return null;
    }
    async close() {
        // no-op by default
    }
}
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