decode

Netty源码分析 (九)----- 拆包器的奥秘

感情迁移 提交于 2019-11-30 02:47:03
Netty 的解码器有很多种,比如基于长度的,基于分割符的,私有协议的。但是,总体的思路都是一致的。 拆包思路:当数据满足了 解码条件时,将其拆开。放到数组。然后发送到业务 handler 处理。 半包思路: 当读取的数据不够时,先存起来,直到满足解码条件后,放进数组。送到业务 handler 处理。 拆包的原理 在没有netty的情况下,用户如果自己需要拆包,基本原理就是不断从TCP缓冲区中读取数据,每次读取完都需要判断是否是一个完整的数据包 1.如果当前读取的数据不足以拼接成一个完整的业务数据包,那就保留该数据,继续从tcp缓冲区中读取,直到得到一个完整的数据包 2.如果当前读到的数据加上已经读取的数据足够拼接成一个数据包,那就将已经读取的数据拼接上本次读取的数据,够成一个完整的业务数据包传递到业务逻辑,多余的数据仍然保留,以便和下次读到的数据尝试拼接 netty中拆包的基类 netty 中的拆包也是如上这个原理,在每个SocketChannel中会一个 pipeline ,pipeline 内部会加入解码器,解码器都继承基类 ByteToMessageDecoder,其 内部会有一个累加器,每次从当前SocketChannel读取到数据都会不断累加,然后尝试对累加到的数据进行拆包,拆成一个完整的业务数据包,下面我们先详细分析下这个类 看名字的意思是:将字节转换成消息的解码器

How to fix ''UnicodeDecodeError: 'charmap' codec can't decode byte 0x9d in position 29815: character maps to <undefined>''?

我是研究僧i 提交于 2019-11-30 02:46:14
问题 At the moment, I am trying to get a Python 3 program to do some manipulations with a text file filled with information, through the Spyder IDE/GUI. However, when trying to read the file I get the following error: File "<ipython-input-13-d81e1333b8cd>", line 77, in <module> parser(f) File "<ipython-input-13-d81e1333b8cd>", line 18, in parser data = infile.read() File "C:\ProgramData\Anaconda3\lib\encodings\cp1252.py", line 23, in decode return codecs.charmap_decode(input,self.errors,decoding

Codable and XMLParser in Swift4

怎甘沉沦 提交于 2019-11-30 02:40:32
问题 Using Swift4, iOS11.1, Xcode9.1, Using the new Swift4 typealiase "Codable" works well for JSON-decoding (as explained here or here or in many other contributions). However, as it comes to XML-parsing, I couldn't find any information on whether this "Codable" protocol could also be used for XML-decoding. I tried to use the XMLParser (as can be seen in code-excerts below). But I failed to used the "Codable" protocol as to simplify the XML-parsing process. How would I have to use the Codable

How to decode encrypted wordpress admin password?

给你一囗甜甜゛ 提交于 2019-11-30 02:13:20
I forgot my WordPress admin password, and I see it in the phpMyAdmin file. But it is in a different form. How I can decode it to know what my password is? Is there any tool for decoding passwords? $P$BX5675uhhghfhgfhfhfgftut/0 Help me. You can't easily decrypt the password from the hash string that you see. You should rather replace the hash string with a new one from a password that you do know. There's a good howto here: https://jakebillo.com/wordpress-phpass-generator-resetting-or-creating-a-new-admin-user/ Basically: generate a new hash from a known password using e.g. http://scriptserver

windows mp3 decode library c c++ [closed]

吃可爱长大的小学妹 提交于 2019-11-30 00:02:48
问题 It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center. Closed 6 years ago . I've spent all day on this and its driving me nuts Does someone know a simple way to decode an mp3 to a simple 16 bit pcm (wave) file? i need something i can ship with my commercial program so i prefer a .lib I

Flask UnicodeDecodeError: 'utf-8' codec can't decode byte 0x80 in position 0: invalid start byte 错误

蹲街弑〆低调 提交于 2019-11-29 21:39:51
UnicodeDecodeError: ‘utf-8’ codec can’t decode byte 0x80 in position 0: invalid start byte解决方法 再做Flask项目时候遇到的很蒙的bug分享出来,大家可以借鉴 项目基于Flask前后端不分离开发 在访问首页的时候出现如下报错 然后就是各种找,最后发现是读取Redis时出的问题 在获取Redis数据进行读片验证码对比的时候,考虑到每次取出的都是字节类型,还需要转码,比较麻烦 就在实例化Redis连接对象的时候加上了 decode_responses=True,这样就不用每次都解码, 但是我在程序中只实例化出一个redis连接对象然后传过来直接诶使用的,所以就影响到Session从Redis中获取数据了。 然后删掉 decode_responses=True 问题解决,在这里提示,在Redis中存储不同类型的数据的时候,尽量不要使用同一个连接对象。 来源: CSDN 作者: laoli66666666 链接: https://blog.csdn.net/weixin_42345642/article/details/88367023

FFMPEG - ffplay源代码分析

[亡魂溺海] 提交于 2019-11-29 18:19:27
FFmpeg是一个开源,免费,跨平台的视频和音频流方案,它提供了一套完整的录制、转换以及流化音视频的解决方案。而ffplay是有ffmpeg官方提供的一个基于ffmpeg的简单播放器。学习ffplay对于播放器流程、ffmpeg的调用等等是一个非常好的例子。 1.例子 这里的说明使用如下的例子: ./ffplay avm.mp4 2. read_thread() 线程read_thread负责demux,它的流程如下图: avformat_alloc_context分配AVFormatContext。这是demux的上下文; avformat_open_input()解析文件,确定文件的封装格式(即mux类型); aformat_find_stream_info()继续解析AVFormatContext中包含的stream,根据stream类型确定其decoder,并创建AVCodecContext,这是decode的上下文; 如果指定了播放位置,avformat_seek_file()将播放位置移动到指定位置; av_find_best_stream()查找指定stream类型的最佳质量的stream。 stream_component_open()创建新的线程video_thread。Video_thread负责decode。 最后,read_thread在循环中,调用av

Decoding foreign language characters in url

亡梦爱人 提交于 2019-11-29 17:44:24
I am decoding characters in a URL by using HTTPUtility.URLDecode. Here are the characters I have to decode: %26 = "&" %28 = "(" %29 = ")" %20 = " " %5B = "[" %5D = "]" %2C = "," %23 = "#" %F3 = "ó" (spanish character) HTTPUtility.URLDecode works great on all but the last one. I am doing a find/replace on that last character right now, but hoping there is a better automatic way so I don't have to update the find/replace in the future. You should use an overload of HttpUtility.UrlDecode() that accepts an encoding : HttpUtility.UrlDecode("%F3", Encoding.GetEncoding("ISO-8859-1")) This assumes it

How to read email using Python 3

本小妞迷上赌 提交于 2019-11-29 16:18:48
Now I am here import imaplib mail = imaplib.IMAP4_SSL('imap.gmail.com') mail.login('login@gmail.com', 'password') mail.list() # Out: list of "folders" aka labels in gmail. mail.select("inbox") # connect to inbox. #Get an email result, data = mail.uid('fetch', b'1', '(RFC822)') raw_email = data[0][1] email_message = email.message_from_bytes(raw_email) maintype = email_message.get_content_maintype() #HERE COMES TROUBLES - if hmtl will be base64 string if maintype == 'multipart': for part in email_message.get_payload(): print(part.get_content_maintype()) if part.get_content_maintype() == 'text':

UTF8 Encoding in Android when invoking REST webservice

生来就可爱ヽ(ⅴ<●) 提交于 2019-11-29 15:43:16
问题 I'm invoking a rest WS that returns XML. Some elements have strings include special characters like áãç etc... When I get the information via browser all of it is shown properly but when invoking it from Android I don't get the proper special characters. Notice the 'decoded' and 'encoded' variables: when I use URLDecoder.decode(result, "UTF-8") The result stays the same when I use URLEncoder.encode(result, "UTF-8") The result changes to what it would be expected (full of %'s symbols and