Copybara bot | be50d49 | 2023-11-30 00:16:42 +0100 | [diff] [blame] | 1 | /** |
| 2 | * convert RFC 1342-like base64 strings to array buffer |
| 3 | * @param {mixed} obj |
| 4 | * @returns {undefined} |
| 5 | */ |
| 6 | function recursiveBase64StrToArrayBuffer(obj) { |
| 7 | let prefix = '=?BINARY?B?'; |
| 8 | let suffix = '?='; |
| 9 | if (typeof obj === 'object') { |
| 10 | for (let key in obj) { |
| 11 | if (typeof obj[key] === 'string') { |
| 12 | let str = obj[key]; |
| 13 | if (str.substring(0, prefix.length) === prefix && str.substring(str.length - suffix.length) === suffix) { |
| 14 | str = str.substring(prefix.length, str.length - suffix.length); |
| 15 | |
| 16 | let binary_string = window.atob(str); |
| 17 | let len = binary_string.length; |
| 18 | let bytes = new Uint8Array(len); |
| 19 | for (var i = 0; i < len; i++) { |
| 20 | bytes[i] = binary_string.charCodeAt(i); |
| 21 | } |
| 22 | obj[key] = bytes.buffer; |
| 23 | } |
| 24 | } else { |
| 25 | recursiveBase64StrToArrayBuffer(obj[key]); |
| 26 | } |
| 27 | } |
| 28 | } |
| 29 | } |
| 30 | |
| 31 | /** |
| 32 | * Convert a ArrayBuffer to Base64 |
| 33 | * @param {ArrayBuffer} buffer |
| 34 | * @returns {String} |
| 35 | */ |
| 36 | function arrayBufferToBase64(buffer) { |
| 37 | var binary = ''; |
| 38 | var bytes = new Uint8Array(buffer); |
| 39 | var len = bytes.byteLength; |
| 40 | for (var i = 0; i < len; i++) { |
| 41 | binary += String.fromCharCode( bytes[ i ] ); |
| 42 | } |
| 43 | return window.btoa(binary); |
| 44 | } |