devextreme/cjs/__internal/ui/file_uploader/file_blob_reader.js

HTML5 JavaScript Component Suite for Responsive Web Development

/**
 * DevExtreme (cjs/__internal/ui/file_uploader/file_blob_reader.js)
 * Version: 25.2.3
 * Build date: Fri Dec 12 2025
 *
 * Copyright (c) 2012 - 2025 Developer Express Inc. ALL RIGHTS RESERVED
 * Read about DevExtreme licensing here: https://js.devexpress.com/Licensing/
 */

"use strict";
Object.defineProperty(exports, "__esModule", {
    value: true
});
exports.FileBlobReader = void 0;
class FileBlobReader {
    constructor(file, chunkSize) {
        this.file = file;
        this.chunkSize = chunkSize;
        this.index = 0
    }
    read() {
        if (!this.file) {
            return null
        }
        const result = this.createBlobResult(this.file, this.index, this.chunkSize);
        if (result.isCompleted) {
            this.file = null
        }
        this.index += 1;
        return result
    }
    createBlobResult(file, index, chunkSize) {
        const currentPosition = index * chunkSize;
        return {
            blob: this.sliceFile(file, currentPosition, chunkSize),
            index: index,
            isCompleted: currentPosition + chunkSize >= file.size
        }
    }
    sliceFile(file, startPos, length) {
        if (file.slice) {
            return file.slice(startPos, startPos + length)
        }
        if ("webkitSlice" in file && "function" === typeof file.webkitSlice) {
            return file.webkitSlice(startPos, startPos + length)
        }
        return null
    }
}
exports.FileBlobReader = FileBlobReader;