base64

What are the drawbacks of base64 encoding data?

由 风格不统一 提交于 2019-12-23 20:21:41
问题 Over the past two years or so, I've base64 encoded multiple types of data for the web: images, .otf files, text, and so on. It's practical in that it serves as a makeshift asset consolidation method (with the data embedded directly in the CSS or HTML, one doesn't have to worry about a dead link), but are there any drawbacks to using this method? 回答1: The base64 encoded data is about 33% larger than the raw data. Another effect is that you are bundling several pieces of data together into

Converting an image to binary in javascript using base64

由 强颜欢笑 提交于 2019-12-23 19:19:02
问题 I have to convert an image to binary for storing it through IPFS and retrieve it again as a viewable image. I should do this with javascript code. Does any body have any clear example of how to do this? Will Base64 help me? Thanks in advance 回答1: Use File Reader: /******************for base 64 *****************************/ function uploadFile(inputElement) { var file = inputElement.files[0]; var reader = new FileReader(); reader.onloadend = function() { console.log('Encoded Base 64 File

FireFox : image base64 data using canvas object not working

由 天涯浪子 提交于 2019-12-23 19:18:39
问题 This is the code i wrote to resize the image in aspect ratio, it works on chrome but not display on firefox, does anyone know what is wrong. var image = new Image(); image.src = data; //$(image).load(function () { var aspectRatio = getAspectRatio(parseFloat($(image).prop('naturalWidth')), parseFloat($(image).prop('naturalHeight')), dstWidth, dstHeight); var canvas = document.createElement('canvas'); canvas.width = dstWidth; canvas.height = dstHeight; var x = (dstWidth - aspectRatio[0]) / 2;

Getting favicon to work in Chrome with base64 data

由 [亡魂溺海] 提交于 2019-12-23 18:53:16
问题 I have searched the half of the day for this. It seems that its really easy for people to make it working.. But I have some problems getting Chrome to understand it. Its works in FF. I have the icon in png format located in root. Any ideas? I'm using this code; <link id=​"favicon" rel=​"shortcut icon" type=​"image/​png" href=​"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAIAAACQkWg2AAAAGXRFWHRTb2Z0d2FyZQBBZG9iZSBJbWFnZVJlYWR5ccllPAAAA2hpVFh0WE1MOmNvbS5hZG9iZS54bXAAAAAAADw

对favicon进行base64 编码？

由 ぃ、小莉子 提交于 2019-12-23 18:45:57
【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 打算给网站加上个标签栏里的图标，类似这种 。 据维基百科， Favicon 是favorites icon的缩写，亦被称为website icon（网页图标）、page icon（页面图标）或urlicon（URL图标）。Favicon是与某个网站或网页相关联的图标。浏览器可以将favicon显示于浏览器的地址栏中，也可置于书签列表的网站名前，还可以放在标签式浏览界面中的页标题前。 任何一个适当大小的（16×16像素或更大）的图像都可以用作favicon。有两种实现方法，第一种是将图标命名为“favicon.ico”，并置于web服务器的根目录下，即可以自动显示该文件。第二种方法更为灵活，即使用HTML来为任何一个网页指示其图标所存储的位置。这种方法是通过在页面的 <head> 部分添加两个link组件来实现的： <link rel="icon" href="Images/favicon.ico" type="image/x-icon" /> <link rel="shortcut icon" href="Images/favicon.ico" type="image/x-icon" /> 这样，图标位置不一定要在web服务器根目录下，名字也不一定是favicon.ico。我为了更好的兼容性，两种方法都用上了

Base64 decode gives different results in Java and Ruby

由 偶尔善良 提交于 2019-12-23 18:42:03
问题 I am decoding some text using Base64. I have tried three different libraries (commons Base64 , Java.misc. , and also java.mail) in Java and all of them produce same result for the following text, which is not right. However when I use Ruby to decode the below string I get different output. I get the right result using Ruby. The Ruby code is print Base64.decode64('<Below String>') , the string is RkxWAQEAAAAJAAAAABIAAK4AAAAAAAAAAgAKb25NZXRhRGF0YQgAAAAHAAV3aWR0aABAdAAAAAAA

Converted base64 image does not work, how can I get true base64 image?

由 浪尽此生 提交于 2019-12-23 18:34:12
问题 I try to convert my request payload to base64 but the result of my code is not a valid base64 image. When I try to use it in the browser, it doesn't display the image. So I try to write simple code to convert image to base64 or using npm modules but the result is the same and I don't get a valid image! const request = require('request'); const url = "http://cdn1.giltcdn.com/images/share/uploads/0000/0001/7250/172502872/420x560.jpg"; request({url, gzip: true}, function (err, res, body) { if(

base64在网页css和的运用

由 本小妞迷上赌 提交于 2019-12-23 18:18:53
【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> ###为什么我们要对图片base64编码 base64是当前网络上最为常见的传输8Bit字节代码的编码方式其中之一。base64主要不是加密，它主要的用途是把某些二进制数转成普通字符用于网络传输。由于这些二进制字符在传输协议中属于控制字符，不能直接传送，所以需要转换一下。虽然图片可能直接传输，但是我们也可以将它变成字符串直接放在源码里，而不需要浏览器在读取到源码后再从服务器上下载。 如何对图片进行base64编码 PHP <?php // 说明：浏览该文件将看到N多行字符串 $file= 'upall.gif'; $fp = fopen($file, 'rb', 0); echo chunk_split(base64_encode(fread($fp,filesize($file)))); fclose($fp); ?> HTML <img src="data:image/gif;base64,R0lGODl(这里省略部分BASE64字符串)CAgAOw=="/> css background:url("data:image/gif;base64,R0lGODl(再省略部分字符)CAgAOw=="); js 来源： oschina 链接： https://my.oschina.net/u/2889389

Interpreting base 64 in C# from an image based via JSON/PHP (base64_encode)

由 十年热恋 提交于 2019-12-23 17:50:37
问题 So I'm able to read an image file successfully, and pass it back to my C# application but I'm unable to decode it properly. I'm returning the JSON data as such (the json_encode function isn't shown) via PHP: $imgbinary = fread(fopen($filename, "r"), filesize($filename)); if ( strlen($imgbinary) > 0 ){ return array("success"=>true, "map"=>base64_encode($imgbinary)); } Then in C# I use Newtonsoft.Json to decode the string (I can read success and the map properties successfully), but I'm unable

JavaMail base64 encoding

由 你。 提交于 2019-12-23 17:48:01
问题 I have some Java code which sends out an email with code somewhat like the following: MimeBodyPart part = new MimeBodyPart(); part.setContent(htmlString, "text/html; charset=\"UTF-8\""); part.setHeader("MIME-Version", "1.0"); part.setHeader("Content-Type", "text/html; charset=\"UTF-8\""); part.setHeader("Importance", severityVal); mimeMultiPart.addBodyPart(htmlPart); mimeMessage.setContent(mimeMultiPart); ... and so on. How can I encode the "part" MimeBodyPart in base64 for this outgoing
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