82 lines
1.7 KiB
JavaScript
82 lines
1.7 KiB
JavaScript
OV.ArrayBufferToUtf8String = function (buffer)
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{
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let decoder = new TextDecoder ('utf-8');
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return decoder.decode (buffer);
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};
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OV.ArrayBufferToAsciiString = function (buffer)
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{
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let text = '';
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let bufferView = new Uint8Array (buffer);
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for (let i = 0; i < bufferView.byteLength; i++) {
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text += String.fromCharCode (bufferView[i]);
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}
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return text;
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};
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OV.AsciiStringToArrayBuffer = function (str)
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{
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let buffer = new ArrayBuffer (str.length);
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let bufferView = new Uint8Array (buffer);
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for (let i = 0; i < str.length; i++) {
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bufferView[i] = str.charCodeAt (i);
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}
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return buffer;
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};
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OV.Utf8StringToArrayBuffer = function (str)
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{
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let encoder = new TextEncoder ();
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return encoder.encode (str);
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};
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OV.Base64DataURIToArrayBuffer = function (uri)
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{
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let dataPrefix = 'data:';
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if (!uri.startsWith (dataPrefix)) {
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return null;
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}
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let mimeSeparator = uri.indexOf (';');
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if (mimeSeparator === -1) {
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return null;
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}
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let bufferSeparator = uri.indexOf (',');
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if (bufferSeparator === -1) {
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return null;
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}
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let mimeType = uri.substr (dataPrefix.length, mimeSeparator - 5);
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let base64String = atob (uri.substr (bufferSeparator + 1));
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let buffer = new ArrayBuffer (base64String.length);
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let bufferView = new Uint8Array (buffer);
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for (let i = 0; i < base64String.length; i++) {
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bufferView[i] = base64String.charCodeAt (i);
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}
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return {
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mimeType : mimeType,
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buffer : buffer
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};
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};
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OV.CreateObjectUrl = function (content)
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{
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let blob = new Blob ([content]);
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let url = URL.createObjectURL (blob);
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return url;
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};
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OV.CreateObjectUrlWithMimeType = function (content, mimeType)
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{
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let blob = new Blob ([content], { type : mimeType });
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let url = URL.createObjectURL (blob);
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return url;
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};
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OV.RevokeObjectUrl = function (url)
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{
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URL.revokeObjectURL (url);
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};
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