请问小程序使用AES加密大文件怎么做？ 比如100M的文件，先读入内存再用crypto-js加密，小程序直接崩了；小程序是否支持类似流式加密，不用一次性读入内存整体加密？或者还有其它更好的实现方式？

FileSystemManager.readZipEntry 不支持rar/rar5压缩格式解压吗？请问还有其它API可用吗？如无当前无API，微信小程序什么时候能支持？

场景：界面上有1-9个小canvas，有按钮触发query1-7个canvas，每个canvas会执行一次wx.canvasToTempFilePath然后进行拼接， 固定第二个canvas的canvasToTempFilePath调用会报错：wx.canvasToTempFilePath#fail(小canvas)> {"errMsg":"canvasToTempFilePath: fail width is 0"} 打印日志宽度都是有的： ={"left":34,"top":10,"width":292,"height":439} photo_puzzle.js:39 ======canvas list==== photo_puzzle.js:72 #canvas-3-0 photo_puzzle.js:76 canvasRect> {"left":34,"top":10,"width":97,"height":439} photo_puzzle.js:77 canvasRect> x=0;y=0 photo_puzzle.js:72 #canvas-3-1 photo_puzzle.js:76 canvasRect> {"left":131,"top":10,"width":97,"height":439} photo_puzzle.js:77 canvasRect> x=97;y=0 photo_puzzle.js:110 wx.canvasToTempFilePath#fail(小canvas)> {"errMsg":"canvasToTempFilePath:fail width is 0"} 相关代码：             // 查询每个小canvas的尺寸参数             const query = wx.createSelectorQuery();             console.log('#canvas-' + tid + '-' + bidx);             query.select('#canvas-' + tid + '-' + bidx).fields({ node: true, rect: true, size: true }).exec((res) => {                 const canvas = res[0].node;                 const canvasRect = {left: res[0].left, top: res[0].top, width:res[0].width, height: res[0].height};                 console.log('canvasRect> '+JSON.stringify(canvasRect));                 console.log('canvasRect> x='+(canvasRect.left-boxRect.left)+';y='+(canvasRect.top-boxRect.top));                 // 获取小canvas图片对象                 wx.canvasToTempFilePath({                     x: canvasRect.left-boxRect.left,                     y: canvasRect.top-boxRect.top,                     width: canvasRect.width,                     height: canvasRect.height,                     destWidth: canvasRect.width,                     destHeight: canvasRect.height,                     canvas: canvas,                     success(res){                         let imageSrc = res.tempFilePath;                         let offCtx = offCanvas.getContext('2d');                         // 将单个小图片绘制到离线canvas画布上                         let image = offCanvas.createImage();                         image.src = imageSrc;                         image.onload = () => {                             offCtx.drawImage(image,                                  canvasRect.left-boxRect.left,                                 canvasRect.top-boxRect.top,                                 canvasRect.width,                                 canvasRect.height,                             );                             // 绘制一张后，需要递增绘制下一张                             self.setData({                                 offDraw: {offCanvas: offCanvas, boxRect:boxRect, bidx: bidx+1},                             });                             setTimeout(()=>{                                 self.drawPhotoEvent()                             },1);                         }                     },                     fail(res){                         console.log('wx.canvasToTempFilePath#fail(小canvas)> '+JSON.stringify(res));                     },                 });