Andrew Zambazos
71 lines
2.8 KiB
JavaScript
71 lines
2.8 KiB
JavaScript
/*
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* Copyright (C) 2019 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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WI.BlobUtilities = class BlobUtilities {
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static blobForContent(content, base64Encoded, mimeType)
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{
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if (base64Encoded)
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return BlobUtilities.decodeBase64ToBlob(content, mimeType);
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return BlobUtilities.textToBlob(content, mimeType);
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}
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static decodeBase64ToBlob(base64Data, mimeType)
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{
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mimeType = mimeType || "";
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const sliceSize = 1024;
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let byteCharacters = atob(base64Data);
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let bytesLength = byteCharacters.length;
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let slicesCount = Math.ceil(bytesLength / sliceSize);
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let byteArrays = new Array(slicesCount);
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for (let sliceIndex = 0; sliceIndex < slicesCount; ++sliceIndex) {
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let begin = sliceIndex * sliceSize;
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let end = Math.min(begin + sliceSize, bytesLength);
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let bytes = new Array(end - begin);
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for (let offset = begin, i = 0; offset < end; ++i, ++offset)
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bytes[i] = byteCharacters[offset].charCodeAt(0);
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byteArrays[sliceIndex] = new Uint8Array(bytes);
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}
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return new Blob(byteArrays, {type: mimeType});
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}
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static textToBlob(text, mimeType)
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{
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return new Blob([text], {type: mimeType});
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}
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static blobAsText(blob, callback)
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{
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console.assert(blob instanceof Blob);
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let fileReader = new FileReader;
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fileReader.addEventListener("loadend", () => { callback(fileReader.result); });
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fileReader.readAsText(blob);
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}
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};
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