From 210e8feae2fb4842bfb2de38666e6c41671fef3c Mon Sep 17 00:00:00 2001 From: Pliable Pixels Date: Wed, 27 Sep 2017 12:42:48 -0400 Subject: removed lib --- www/lib/localforage/src/utils/serializer.js | 235 ---------------------------- 1 file changed, 235 deletions(-) delete mode 100644 www/lib/localforage/src/utils/serializer.js (limited to 'www/lib/localforage/src/utils/serializer.js') diff --git a/www/lib/localforage/src/utils/serializer.js b/www/lib/localforage/src/utils/serializer.js deleted file mode 100644 index ddeed301..00000000 --- a/www/lib/localforage/src/utils/serializer.js +++ /dev/null @@ -1,235 +0,0 @@ -import createBlob from './createBlob'; - -// Sadly, the best way to save binary data in WebSQL/localStorage is serializing -// it to Base64, so this is how we store it to prevent very strange errors with less -// verbose ways of binary <-> string data storage. -var BASE_CHARS = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'; - -var BLOB_TYPE_PREFIX = '~~local_forage_type~'; -var BLOB_TYPE_PREFIX_REGEX = /^~~local_forage_type~([^~]+)~/; - -var SERIALIZED_MARKER = '__lfsc__:'; -var SERIALIZED_MARKER_LENGTH = SERIALIZED_MARKER.length; - -// OMG the serializations! -var TYPE_ARRAYBUFFER = 'arbf'; -var TYPE_BLOB = 'blob'; -var TYPE_INT8ARRAY = 'si08'; -var TYPE_UINT8ARRAY = 'ui08'; -var TYPE_UINT8CLAMPEDARRAY = 'uic8'; -var TYPE_INT16ARRAY = 'si16'; -var TYPE_INT32ARRAY = 'si32'; -var TYPE_UINT16ARRAY = 'ur16'; -var TYPE_UINT32ARRAY = 'ui32'; -var TYPE_FLOAT32ARRAY = 'fl32'; -var TYPE_FLOAT64ARRAY = 'fl64'; -var TYPE_SERIALIZED_MARKER_LENGTH = SERIALIZED_MARKER_LENGTH + - TYPE_ARRAYBUFFER.length; - -var toString = Object.prototype.toString; - -function stringToBuffer(serializedString) { - // Fill the string into a ArrayBuffer. - var bufferLength = serializedString.length * 0.75; - var len = serializedString.length; - var i; - var p = 0; - var encoded1, encoded2, encoded3, encoded4; - - if (serializedString[serializedString.length - 1] === '=') { - bufferLength--; - if (serializedString[serializedString.length - 2] === '=') { - bufferLength--; - } - } - - var buffer = new ArrayBuffer(bufferLength); - var bytes = new Uint8Array(buffer); - - for (i = 0; i < len; i += 4) { - encoded1 = BASE_CHARS.indexOf(serializedString[i]); - encoded2 = BASE_CHARS.indexOf(serializedString[i + 1]); - encoded3 = BASE_CHARS.indexOf(serializedString[i + 2]); - encoded4 = BASE_CHARS.indexOf(serializedString[i + 3]); - - /*jslint bitwise: true */ - 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. -function bufferToString(buffer) { - // base64-arraybuffer - var bytes = new Uint8Array(buffer); - var base64String = ''; - var i; - - for (i = 0; i < bytes.length; i += 3) { - /*jslint bitwise: true */ - base64String += BASE_CHARS[bytes[i] >> 2]; - base64String += BASE_CHARS[((bytes[i] & 3) << 4) | (bytes[i + 1] >> 4)]; - base64String += BASE_CHARS[((bytes[i + 1] & 15) << 2) | (bytes[i + 2] >> 6)]; - base64String += 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. -function serialize(value, callback) { - var 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... - // - // TODO: See why those tests fail and use a better solution. - 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. - var buffer; - var marker = SERIALIZED_MARKER; - - if (value instanceof ArrayBuffer) { - buffer = value; - marker += TYPE_ARRAYBUFFER; - } else { - buffer = value.buffer; - - if (valueType === '[object Int8Array]') { - marker += TYPE_INT8ARRAY; - } else if (valueType === '[object Uint8Array]') { - marker += TYPE_UINT8ARRAY; - } else if (valueType === '[object Uint8ClampedArray]') { - marker += TYPE_UINT8CLAMPEDARRAY; - } else if (valueType === '[object Int16Array]') { - marker += TYPE_INT16ARRAY; - } else if (valueType === '[object Uint16Array]') { - marker += TYPE_UINT16ARRAY; - } else if (valueType === '[object Int32Array]') { - marker += TYPE_INT32ARRAY; - } else if (valueType === '[object Uint32Array]') { - marker += TYPE_UINT32ARRAY; - } else if (valueType === '[object Float32Array]') { - marker += TYPE_FLOAT32ARRAY; - } else if (valueType === '[object Float64Array]') { - marker += TYPE_FLOAT64ARRAY; - } else { - callback(new Error('Failed to get type for BinaryArray')); - } - } - - callback(marker + bufferToString(buffer)); - } else if (valueType === '[object Blob]') { - // Conver the blob to a binaryArray and then to a string. - var fileReader = new FileReader(); - - fileReader.onload = function() { - // Backwards-compatible prefix for the blob type. - var str = BLOB_TYPE_PREFIX + value.type + '~' + - bufferToString(this.result); - - callback(SERIALIZED_MARKER + 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. -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) !== 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. - var serializedString = value.substring(TYPE_SERIALIZED_MARKER_LENGTH); - var type = value.substring(SERIALIZED_MARKER_LENGTH, - TYPE_SERIALIZED_MARKER_LENGTH); - - var blobType; - // Backwards-compatible blob type serialization strategy. - // DBs created with older versions of localForage will simply not have the blob type. - if (type === TYPE_BLOB && BLOB_TYPE_PREFIX_REGEX.test(serializedString)) { - var matcher = serializedString.match(BLOB_TYPE_PREFIX_REGEX); - blobType = matcher[1]; - serializedString = serializedString.substring(matcher[0].length); - } - var buffer = stringToBuffer(serializedString); - - // Return the right type based on the code/type set during - // serialization. - switch (type) { - case TYPE_ARRAYBUFFER: - return buffer; - case TYPE_BLOB: - return createBlob([buffer], {type: blobType}); - case TYPE_INT8ARRAY: - return new Int8Array(buffer); - case TYPE_UINT8ARRAY: - return new Uint8Array(buffer); - case TYPE_UINT8CLAMPEDARRAY: - return new Uint8ClampedArray(buffer); - case TYPE_INT16ARRAY: - return new Int16Array(buffer); - case TYPE_UINT16ARRAY: - return new Uint16Array(buffer); - case TYPE_INT32ARRAY: - return new Int32Array(buffer); - case TYPE_UINT32ARRAY: - return new Uint32Array(buffer); - case TYPE_FLOAT32ARRAY: - return new Float32Array(buffer); - case TYPE_FLOAT64ARRAY: - return new Float64Array(buffer); - default: - throw new Error('Unkown type: ' + type); - } -} - -var localforageSerializer = { - serialize: serialize, - deserialize: deserialize, - stringToBuffer: stringToBuffer, - bufferToString: bufferToString -}; - -export default localforageSerializer; -- cgit v1.2.3