function readSuccessCallback()

in www/FileReader.js [131:181]

• 41 lines of code
• 11 McCabe index (conditional complexity)

function readSuccessCallback (readType, encoding, offset, totalSize, accumulate, r) {
    if (this._readyState === FileReader.DONE) {
        return;
    }

    let CHUNK_SIZE = FileReader.READ_CHUNK_SIZE;
    if (readType === 'readAsDataURL') {
        // Windows proxy does not support reading file slices as Data URLs
        // so read the whole file at once.
        CHUNK_SIZE = cordova.platformId === 'windows'
            ? totalSize
            : (
                // Calculate new chunk size for data URLs to be multiply of 3
                // Otherwise concatenated base64 chunks won't be valid base64 data
                FileReader.READ_CHUNK_SIZE - (FileReader.READ_CHUNK_SIZE % 3) + 3
            );
    }

    if (typeof r !== 'undefined') {
        accumulate(r);
        this._progress = Math.min(this._progress + CHUNK_SIZE, totalSize);

        if (typeof this.onprogress === 'function') {
            this.onprogress(new ProgressEvent('progress', { loaded: this._progress, total: totalSize }));
        }
    }

    if (typeof r === 'undefined' || this._progress < totalSize) {
        const execArgs = [
            this._localURL,
            offset + this._progress,
            offset + this._progress + Math.min(totalSize - this._progress, CHUNK_SIZE)];
        if (encoding) {
            execArgs.splice(1, 0, encoding);
        }
        exec(
            readSuccessCallback.bind(this, readType, encoding, offset, totalSize, accumulate),
            readFailureCallback.bind(this),
            'File', readType, execArgs);
    } else {
        this._readyState = FileReader.DONE;

        if (typeof this.onload === 'function') {
            this.onload(new ProgressEvent('load', { target: this }));
        }

        if (typeof this.onloadend === 'function') {
            this.onloadend(new ProgressEvent('loadend', { target: this }));
        }
    }
}