1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 | 6x 6x 6x 10x 9x 1x 6x 25x 25x 6x 6x 30x 10x 8x 12x 6x 14x 14x 69x 69x 60x 9x 1x 8x 4x 4x 1x 3x 3x 3x 3x 4x 1x 3x 14x 6x 6x 6x 2x 4x 6x 13x 9x 9x 9x 1x 1x 8x 4x 4x 4x 1x 1x 3x 3x 11x 11x 11x 11x 101x 11x 6x 21x 21x 21x 21x 1x 20x 20x 12x 12x 20x 6x 6x 12x 11x 5x 6x 6x 9x 9x 12x 12x 12x | /** * Copyright 2017 Google Inc. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ import * as errorsExports from './error'; import { errors } from './error'; /** * @enum {string} */ export type StringFormat = string; export const StringFormat = { RAW: 'raw', BASE64: 'base64', BASE64URL: 'base64url', DATA_URL: 'data_url' }; export function formatValidator(stringFormat: string) { switch (stringFormat) { case StringFormat.RAW: case StringFormat.BASE64: case StringFormat.BASE64URL: case StringFormat.DATA_URL: return; default: throw 'Expected one of the event types: [' + StringFormat.RAW + ', ' + StringFormat.BASE64 + ', ' + StringFormat.BASE64URL + ', ' + StringFormat.DATA_URL + '].'; } } /** * @struct */ export class StringData { contentType: string | null; constructor(public data: Uint8Array, opt_contentType?: string | null) { this.contentType = opt_contentType || null; } } export function dataFromString( format: StringFormat, string: string ): StringData { switch (format) { case StringFormat.RAW: return new StringData(utf8Bytes_(string)); case StringFormat.BASE64: case StringFormat.BASE64URL: return new StringData(base64Bytes_(format, string)); case StringFormat.DATA_URL: return new StringData(dataURLBytes_(string), dataURLContentType_(string)); } // assert(false); throw errorsExports.unknown(); } export function utf8Bytes_(string: string): Uint8Array { let b = []; for (let i = 0; i < string.length; i++) { let c = string.charCodeAt(i); if (c <= 127) { b.push(c); } else { if (c <= 2047) { b.push(192 | (c >> 6), 128 | (c & 63)); } else { if ((c & 64512) == 55296) { // The start of a surrogate pair. let valid = i < string.length - 1 && (string.charCodeAt(i + 1) & 64512) == 56320; if (!valid) { // The second surrogate wasn't there. b.push(239, 191, 189); } else { let hi = c; let lo = string.charCodeAt(++i); c = 65536 | ((hi & 1023) << 10) | (lo & 1023); b.push( 240 | (c >> 18), 128 | ((c >> 12) & 63), 128 | ((c >> 6) & 63), 128 | (c & 63) ); } } else { if ((c & 64512) == 56320) { // Invalid low surrogate. b.push(239, 191, 189); } else { b.push(224 | (c >> 12), 128 | ((c >> 6) & 63), 128 | (c & 63)); } } } } } return new Uint8Array(b); } export function percentEncodedBytes_(string: string): Uint8Array { let decoded; try { decoded = decodeURIComponent(string); } catch (e) { throw errorsExports.invalidFormat( StringFormat.DATA_URL, 'Malformed data URL.' ); } return utf8Bytes_(decoded); } export function base64Bytes_(format: StringFormat, string: string): Uint8Array { switch (format) { case StringFormat.BASE64: { let hasMinus = string.indexOf('-') !== -1; let hasUnder = string.indexOf('_') !== -1; if (hasMinus || hasUnder) { let invalidChar = hasMinus ? '-' : '_'; throw errorsExports.invalidFormat( format, "Invalid character '" + invalidChar + "' found: is it base64url encoded?" ); } break; } case StringFormat.BASE64URL: { let hasPlus = string.indexOf('+') !== -1; let hasSlash = string.indexOf('/') !== -1; if (hasPlus || hasSlash) { let invalidChar = hasPlus ? '+' : '/'; throw errorsExports.invalidFormat( format, "Invalid character '" + invalidChar + "' found: is it base64 encoded?" ); } string = string.replace(/-/g, '+').replace(/_/g, '/'); break; } } let bytes; try { bytes = atob(string); } catch (e) { throw errorsExports.invalidFormat(format, 'Invalid character found'); } let array = new Uint8Array(bytes.length); for (let i = 0; i < bytes.length; i++) { array[i] = bytes.charCodeAt(i); } return array; } /** * @struct */ class DataURLParts { base64: boolean = false; contentType: string | null = null; rest: string; constructor(dataURL: string) { let matches = dataURL.match(/^data:([^,]+)?,/); if (matches === null) { throw errorsExports.invalidFormat( StringFormat.DATA_URL, "Must be formatted 'data:[<mediatype>][;base64],<data>" ); } let middle = matches[1] || null; if (middle != null) { this.base64 = endsWith(middle, ';base64'); this.contentType = this.base64 ? middle.substring(0, middle.length - ';base64'.length) : middle; } this.rest = dataURL.substring(dataURL.indexOf(',') + 1); } } export function dataURLBytes_(string: string): Uint8Array { let parts = new DataURLParts(string); if (parts.base64) { return base64Bytes_(StringFormat.BASE64, parts.rest); } else { return percentEncodedBytes_(parts.rest); } } export function dataURLContentType_(string: string): string | null { let parts = new DataURLParts(string); return parts.contentType; } function endsWith(s: string, end: string): boolean { const longEnough = s.length >= end.length; Iif (!longEnough) { return false; } return s.substring(s.length - end.length) === end; } |