650) this.width=650; "src=" Http://blog.fens.me/wp-content/uploads/2015/03/buffer.png "width=" "height=" "Buffer.png"/>ObjectiveJavaScript is designed for browsers and handles Unicode-encoded strings well, but for binary or non-Unicode encoded data it seems powerless. Node. JS inherits the language features of JavaScript, while extending the JavaScript language, providing the buffer class for binary data processing, so that node. JS can handle all typ
empty.You can also write a string to a buffer that already exists. Buffer.write () writes the string to the location specified in buffer. If there is enough space at the beginning of the specified buffer, the entire string will be written. Otherwise, the tail of the string is truncated so that its size can be placed in buffe
This article mainly introduces the Buffer module in NodeJS, which is very detailed. For more information, see
I. Opening Analysis
The so-called Buffer refers to the "temporary storage zone", which is a memory block that temporarily stores input and output data.
The JS language only has the String data type and does not have the binary data type. Therefore, NodeJ
This article mainly introduces the Buffer module in NodeJS, which is very detailed. For more information, see
I. opening analysis
The so-called Buffer refers to the "Temporary Storage Zone", which is a memory block that temporarily stores input and output data.
The JS language only has the String data type and does not have the binary data type. Therefore, NodeJ
by the following encoding types:
ASCII, UTF-8, Utf-16le/ucs-2, Base64, Binary, Hex
String buffer
New Buffer (str, [encoding]), default UTF-8Buf.write (string, [offset], [length], [encoding])
Buffer Turn string
Buf.tostring ([encoding], [start], [end])
Type of encoding not supported by buffer
Buffer.isencoding (
, 0x6c, 0x6c, 0x6f 2 var dup = new Buffer (bin.length); 3 bin.copy (DUP); 4 dup[0] = 0x48 5 console.log (buffer); // 6 Console.log (DUP); // In a word, the Buffer data processing ability of JS is extended from string to any binary data.The above simple let us know what is the buffer, the following speci
copy a buffer, you must first create a new buffer and copy the data from the original buffer through the. Copy method.This is similar to applying for a new piece of memory and copying the existing in-memory data in the past. Here is an example.Copy CodeThe code is as follows:var buffer= new
This article describes how to read and write data in the memory buffer using the PythonStringIO module. This article describes how to use an instance, StringIO class methods, file operations, and string operation examples, if you need a StringIO class, you can refer to the module that is written in the class. Therefore, its available methods are all in the class.
Full analysis of the lru module of the mysql kernel source code deep Parsing Buffer Pool (bufferpool Part 2)
Liu's original article, CSDN first! Indicate the source for reprinting.
LRU module components
(1) Overall LRU Operating Mechanism
To fully understand the bufpool subsystem, we must break through modules one by one. In my current experience, LRU-> flush-> b
A module is written with a class and has only one Stringio class, so its available methods are in the class.Most of the functions in this class are similar to the methods used to manipulate files.
Cases:
Copy Code code as follows:
#coding =GBK
Import Stringio, Cstringio, sys
s = Stringio.stringio ("Jgood is a handsome boy")
S.write ("Jgood is a handsome boy \ r \ n")
S.write (' okkkk China ')
S.seek (0)
Print S.read (
The module is written in a class and has only one stringio class, so its available methods are all in the class.Most of the functions in this class are similar to file operations.
Example:1 # Coding = GBK23 Import stringio, cstringio, sys45 S = stringio. stringio ("jgood is a handsome boy ")6 s. Write ("jgood is a handsome boy \ r \ n ")7 S. Write ('okkkk China ')8 S. Seek (0)9 print S. Read ()1011 # last 4 bytes12 s. Seek (-4, 2)13 print S. Read ()14
Streaming in UNIX is a standard concept with standard input, output, and standard errorsFor example:Print out all the JS files to grep to filter out the content that contains the HTTP file, called the UNIX pipelineCat *.js | grep httpI learned from the last section that buffer is the data that holds bytes, and the stream is used to stage and move the data, it is usually used together, we can copy the file, like reading the logo, is all read into the m
PostgreSQL 'pgcrypto' Module Buffer Overflow Vulnerability (CVE-2015-0243)
Release date:Updated on:
Affected Systems:PostgreSQL 9.4PostgreSQL 9.1PostgreSQL 8.4Description:Bugtraq id: 72542CVE (CAN) ID: CVE-2015-0243
PostgreSQL is an advanced object-relational database management system that supports extended SQL standard subsets.
PostgreSQL 8.4, 9.1, and 9.4 versions of pgcrypto functions do not correctly p
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