converse-built/node_modules/localforage-driver-commons/_bundle/esm2015/serialiser/index.js

import { createBlob } from './createBlob';
const BLOB_TYPE_PREFIX_REGEX = /^~~local_forage_type~([^~]+)~/;
const SERIALIZED_MARKER_LENGTH = "__lfsc__:" /* SERIALIZED_MARKER */.length;
const TYPE_SERIALIZED_MARKER_LENGTH = SERIALIZED_MARKER_LENGTH + "arbf" /* TYPE_ARRAYBUFFER */.length;
//tslint:disable:no-magic-numbers no-bitwise prefer-switch no-unbound-method
const toString = Object.prototype.toString;
export function stringToBuffer(serializedString) {
    // Fill the string into a ArrayBuffer.
    let bufferLength = serializedString.length * 0.75;
    const len = serializedString.length;
    if (serializedString[serializedString.length - 1] === '=') {
        bufferLength--;
        if (serializedString[serializedString.length - 2] === '=') {
            bufferLength--;
        }
    }
    const buffer = new ArrayBuffer(bufferLength);
    const bytes = new Uint8Array(buffer);
    for (let i = 0, p = 0; i < len; i += 4) {
        const encoded1 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/" /* BASE_CHARS */.indexOf(serializedString[i]);
        const encoded2 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/" /* BASE_CHARS */.indexOf(serializedString[i + 1]);
        const encoded3 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/" /* BASE_CHARS */.indexOf(serializedString[i + 2]);
        const encoded4 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/" /* BASE_CHARS */.indexOf(serializedString[i + 3]);
        bytes[p++] = (encoded1 << 2) | (encoded2 >> 4);
        bytes[p++] = ((encoded2 & 15) << 4) | (encoded3 >> 2);
        bytes[p++] = ((encoded3 & 3) << 6) | (encoded4 & 63);
    }
    return buffer;
}
/**
 * Converts a buffer to a string to store, serialized, in the backend
 * storage library.
 */
export function bufferToString(buffer) {
    // base64-arraybuffer
    const bytes = new Uint8Array(buffer);
    let base64String = '';
    for (let i = 0; i < bytes.length; i += 3) {
        /*jslint bitwise: true */
        base64String += "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/" /* BASE_CHARS */[bytes[i] >> 2];
        base64String += "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/" /* BASE_CHARS */[((bytes[i] & 3) << 4) | (bytes[i + 1] >> 4)];
        base64String +=
            "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/" /* BASE_CHARS */[((bytes[i + 1] & 15) << 2) | (bytes[i + 2] >> 6)];
        base64String += "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/" /* BASE_CHARS */[bytes[i + 2] & 63];
    }
    if (bytes.length % 3 === 2) {
        base64String = base64String.substring(0, base64String.length - 1) + '=';
    }
    else if (bytes.length % 3 === 1) {
        base64String = base64String.substring(0, base64String.length - 2) + '==';
    }
    return base64String;
}
/**
 * Serialize a value, afterwards executing a callback (which usually
 * instructs the `setItem()` callback/promise to be executed). This is how
 * we store binary data with localStorage.
 * @param value
 * @param callback
 */
export function serialize(value, callback) {
    let valueType = '';
    if (value) {
        valueType = toString.call(value);
    }
    // Cannot use `value instanceof ArrayBuffer` or such here, as these
    // checks fail when running the tests using casper.js...
    if (value && (valueType === '[object ArrayBuffer]' ||
        (value.buffer && toString.call(value.buffer) === '[object ArrayBuffer]'))) {
        // Convert binary arrays to a string and prefix the string with
        // a special marker.
        let buffer;
        let marker = "__lfsc__:" /* SERIALIZED_MARKER */;
        if (value instanceof ArrayBuffer) {
            buffer = value;
            marker += "arbf" /* TYPE_ARRAYBUFFER */;
        }
        else {
            buffer = value.buffer;
            if (valueType === '[object Int8Array]') {
                marker += "si08" /* TYPE_INT8ARRAY */;
            }
            else if (valueType === '[object Uint8Array]') {
                marker += "ui08" /* TYPE_UINT8ARRAY */;
            }
            else if (valueType === '[object Uint8ClampedArray]') {
                marker += "uic8" /* TYPE_UINT8CLAMPEDARRAY */;
            }
            else if (valueType === '[object Int16Array]') {
                marker += "si16" /* TYPE_INT16ARRAY */;
            }
            else if (valueType === '[object Uint16Array]') {
                marker += "ur16" /* TYPE_UINT16ARRAY */;
            }
            else if (valueType === '[object Int32Array]') {
                marker += "si32" /* TYPE_INT32ARRAY */;
            }
            else if (valueType === '[object Uint32Array]') {
                marker += "ui32" /* TYPE_UINT32ARRAY */;
            }
            else if (valueType === '[object Float32Array]') {
                marker += "fl32" /* TYPE_FLOAT32ARRAY */;
            }
            else if (valueType === '[object Float64Array]') {
                marker += "fl64" /* TYPE_FLOAT64ARRAY */;
            }
            else {
                callback(new Error('Failed to get type for BinaryArray'));
            }
        }
        callback(marker + bufferToString(buffer));
    }
    else if (valueType === '[object Blob]') {
        // Convert the blob to a binaryArray and then to a string.
        const fileReader = new FileReader();
        fileReader.onload = function () {
            // Backwards-compatible prefix for the blob type.
            //tslint:disable-next-line:restrict-plus-operands
            const str = `${"~~local_forage_type~" /* BLOB_TYPE_PREFIX */ + value.type}~${bufferToString(this.result)}`;
            callback("__lfsc__:" /* SERIALIZED_MARKER */ + "blob" /* TYPE_BLOB */ + str);
        };
        fileReader.readAsArrayBuffer(value);
    }
    else {
        try {
            callback(JSON.stringify(value));
        }
        catch (e) {
            console.error('Couldn\'t convert value into a JSON string: ', value);
            callback(null, e);
        }
    }
}
/**
 * Deserialize data we've inserted into a value column/field. We place
 * special markers into our strings to mark them as encoded; this isn't
 * as nice as a meta field, but it's the only sane thing we can do whilst
 * keeping localStorage support intact.
 *
 * Oftentimes this will just deserialize JSON content, but if we have a
 * special marker (SERIALIZED_MARKER, defined above), we will extract
 * some kind of arraybuffer/binary data/typed array out of the string.
 * @param value
 */
export function deserialize(value) {
    // If we haven't marked this string as being specially serialized (i.e.
    // something other than serialized JSON), we can just return it and be
    // done with it.
    if (value.substring(0, SERIALIZED_MARKER_LENGTH) !== "__lfsc__:" /* SERIALIZED_MARKER */) {
        return JSON.parse(value);
    }
    // The following code deals with deserializing some kind of Blob or
    // TypedArray. First we separate out the type of data we're dealing
    // with from the data itself.
    let serializedString = value.substring(TYPE_SERIALIZED_MARKER_LENGTH);
    const type = value.substring(SERIALIZED_MARKER_LENGTH, TYPE_SERIALIZED_MARKER_LENGTH);
    let blobType;
    // Backwards-compatible blob type serialization strategy.
    // DBs created with older versions of localForage will simply not have the blob type.
    if (type === "blob" /* TYPE_BLOB */ && BLOB_TYPE_PREFIX_REGEX.test(serializedString)) {
        const matcher = serializedString.match(BLOB_TYPE_PREFIX_REGEX);
        blobType = matcher[1];
        serializedString = serializedString.substring(matcher[0].length);
    }
    const buffer = stringToBuffer(serializedString);
    // Return the right type based on the code/type set during
    // serialization.
    switch (type) {
        case "arbf" /* TYPE_ARRAYBUFFER */:
            return buffer;
        case "blob" /* TYPE_BLOB */:
            return createBlob([buffer], { type: blobType });
        case "si08" /* TYPE_INT8ARRAY */:
            return new Int8Array(buffer);
        case "ui08" /* TYPE_UINT8ARRAY */:
            return new Uint8Array(buffer);
        case "uic8" /* TYPE_UINT8CLAMPEDARRAY */:
            return new Uint8ClampedArray(buffer);
        case "si16" /* TYPE_INT16ARRAY */:
            return new Int16Array(buffer);
        case "ur16" /* TYPE_UINT16ARRAY */:
            return new Uint16Array(buffer);
        case "si32" /* TYPE_INT32ARRAY */:
            return new Int32Array(buffer);
        case "ui32" /* TYPE_UINT32ARRAY */:
            return new Uint32Array(buffer);
        case "fl32" /* TYPE_FLOAT32ARRAY */:
            return new Float32Array(buffer);
        case "fl64" /* TYPE_FLOAT64ARRAY */:
            return new Float64Array(buffer);
        default:
            throw new Error('Unkown type: ' + type);
    }
}
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