Zvm | A lightweight jvm written by python | Runtime Evironment library

by 5A59 Python Version: Current License: Apache-2.0

X-Ray Key Features Code Snippets Community Discussions(1)Vulnerabilities Install Support

kandi X-RAY | Zvm Summary

Zvm is a Python library typically used in Server, Runtime Evironment applications. Zvm has no bugs, it has no vulnerabilities, it has a Permissive License and it has low support. However Zvm build file is not available. You can download it from GitHub.

一款 python 实现的 "超轻量级" jvm 的实现 (其实就是只实现了主要功能) "完美"运行各种姿势的 HelloWorld. 方法二: 直接工程导入 pycharm 运行 test.py 吧. class 文件解析类加载运行时数据区指令解释器基本指令集 (总共 205 条，实现了估计 190 多条吧) 简易 gc 简易线程简易 jdk 库. 基本运算 (加减乘除与或位移...) 输出多线程运算 (但是没有加同步) 类加载，继承，多态数组操作 (只支持一维数组) gc (模拟 gc) 异常处理. 代码整理方法分派采用 vtable interface 多维数组 native 方法方法，变量验证 class_loader 读取 jar zip 文件. ...

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Quality

Security

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Support

Zvm has a low active ecosystem.

It has 395 star(s) with 43 fork(s). There are 15 watchers for this library.

It had no major release in the last 6 months.

There are 0 open issues and 1 have been closed. On average issues are closed in 107 days. There are no pull requests.

It has a neutral sentiment in the developer community.

The latest version of Zvm is current.

Quality

Zvm has 0 bugs and 0 code smells.

Security

Zvm has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

Zvm code analysis shows 0 unresolved vulnerabilities.

There are 0 security hotspots that need review.

License

Zvm is licensed under the Apache-2.0 License. This license is Permissive.

Permissive licenses have the least restrictions, and you can use them in most projects.

Reuse

Zvm releases are not available. You will need to build from source code and install.

Zvm has no build file. You will be need to create the build yourself to build the component from source.

Zvm saves you 2018 person hours of effort in developing the same functionality from scratch.

It has 4435 lines of code, 649 functions and 37 files.

It has low code complexity. Code complexity directly impacts maintainability of the code.

Top functions reviewed by kandi - BETA

kandi has reviewed Zvm and discovered the below as its top functions. This is intended to give you an instant insight into Zvm implemented functionality, and help decide if they suit your requirements.

Invoke the invoke method
Hack for debugging
Get a double value
Hack for printing
Execute this instruction
Returns the type of the given descriptor
Execute clinit
Execute the expression
Returns True if the value at index is a top type 1
Executes PUTFIELD
Parse parameters
Execute check cast
Execute the arithmetic operation
Read the command line
Loads the constant pool
Create a new reference array
Test the local variable
Executes a reference frame
Populates the constant pool
Execute the stack
Execute the constant definition
Invokes the method
Executes the instruction
Execute the given frame
Execute the frame
Read the operands from the code_parser

Get all kandi verified functions for this library.

Zvm Key Features

No Key Features are available at this moment for Zvm.

Zvm Examples and Code Snippets

No Code Snippets are available at this moment for Zvm.

Community Discussions

Trending Discussions on Zvm

Does SMTP transfer 7bit or 8bit characters (clear MSB or not?)

QUESTION

Does SMTP transfer 7bit or 8bit characters (clear MSB or not?)

Asked 2020-Oct-18 at 15:34

My understanding is that the original SMTP protocol was defined to limit transmission of characters using only 7 bits to save of transmission costs.

This protocol is almost 40 years old, and since then multiple RFCs have extended the standards.

For compatibility reasons, many if not most modern servers that are 8bit clean, perform a conversion of the message into a "7bit compatible" format, such as quoted-printable, or base64.

So technically, all the characters are 7bit ASCII.

However, the crux of my question is, even if data is encoded in a 7bit friendly way, does this mean that the physical transmission of bits between SMTP server occurs in 7bit units, or does it happen in 8bits?

My assumption is that it happens in 8bits, even if the data is encoded in ASCII. Is this correct?

Here are some relevant links I found:

<< Users send billions of 8-bit messages every year. As far as I know, all servers can handle 8-bit messages. A few years ago I was able to find a few hosts running ancient 7-bit versions of sendmail, but I don't see any now.>>

http://cr.yp.to/smtp/8bitmime.html

<< In practice, however, the body is typically encoded using all eight bits. >>

https://www.ibm.com/support/knowledgecenter/en/SSB27U_6.4.0/com.ibm.zvm.v640.kiml0/smtmlfr.htm

<< This does not cause problems in practice, since virtually all modern mail relays are 8-bit clean >>

https://en.wikipedia.org/wiki/Simple_Mail_Transfer_Protocol#8BITMIME

Update

The refinement of my question should be stated as: Do SMTP servers today still clear the high bit, and encode the 7bit ASCII using only the lower seven bits, or do they actually use the full octet, giving signinficance to the MSB?

...

ANSWER

Answered 2020-Oct-17 at 12:47

I think what you are asking is: "Do SMTP clients shift bits when sending messages to an SMTP server such that each character only uses 7 bits and the 8th bit is the start of the next character?"

If so, no. That has never been the case.

Since the very beginning, SMTP clients/servers have always used all 8 bits per character.

In other words, SMTP clients and servers used the ASCII character encoding which does not include accented characters that are found in 8bit character encodings such as ISO-8859-1. Characters with a value above 127 in the ASCII encoding are treated as undefined.

There are likely a number of reasons for this:

ASCII is simple to support
Every locale had their own preferred extended character encoding that was not compatible with other locales - some of which required more than a single byte to represent a character.
I'm not sure if UTF-8 existed yet (but multibyte unicode did, I think - e.g. UCS2 / UTF-16)
It was difficult and unrealistic to expect so much software to implement character set conversion between all of the widely used character sets (unicode and charset conversion libraries were not as widely available at the time)
The "MESSAGE" specification that preceded MIME, SMTP, etc. was written for the US "internet" and likely didn't need anything outside of ASCII (hence why the original message specifications e.g. rfc0822 and earlier did not define encoding mechanisms).

Source https://stackoverflow.com/questions/64397942

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

No vulnerabilities reported

Install Zvm

You can download it from GitHub.
You can use Zvm like any standard Python library. You will need to make sure that you have a development environment consisting of a Python distribution including header files, a compiler, pip, and git installed. Make sure that your pip, setuptools, and wheel are up to date. When using pip it is generally recommended to install packages in a virtual environment to avoid changes to the system.

Support

For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .

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