geotiff/dist-module/source/filereader.js

GeoTIFF image decoding in JavaScript

import { BaseSource } from './basesource.js';
class FileReaderSource extends BaseSource {
    /**
     * @param {Blob} file
     */
    constructor(file) {
        super();
        this.file = file;
    }
    /**
     * @param {import('./basesource.js').Slice} slice
     * @param {AbortSignal} signal
     * @returns {Promise<import('./basesource.js').SliceWithData>}
     */
    async fetchSlice(slice, signal) {
        return new Promise((resolve, reject) => {
            const blob = this.file.slice(slice.offset, slice.offset + slice.length);
            const reader = new FileReader();
            reader.onload = () => resolve({
                data: /** @type {ArrayBuffer} */ (reader.result),
                offset: slice.offset,
                length: slice.length,
            });
            reader.onerror = reject;
            reader.onabort = reject;
            reader.readAsArrayBuffer(blob);
            if (signal) {
                signal.addEventListener('abort', () => reader.abort());
            }
        });
    }
}
/**
 * Create a new source from a given file/blob.
 * @param {Blob} file The file or blob to read from.
 * @returns {FileReaderSource} The constructed source
 */
export function makeFileReaderSource(file) {
    return new FileReaderSource(file);
}
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