dbuf | simple library to manage resources | DevOps library
kandi X-RAY | dbuf Summary
kandi X-RAY | dbuf Summary
A simple library to manage resources which can be upgraded gracefully
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Top functions reviewed by kandi - BETA
- Query parses a query and returns the query string .
- This is the main function .
- Reload handles a dbm reload request .
- Handler is the HTTP handler for the request
- Get returns the current reference count .
- newDoubleBuffering returns a new DoubleBuffering object .
- NewBlackIDDict returns a new BlackIDDict .
- NewManager returns a new Manager .
dbuf Key Features
dbuf Examples and Code Snippets
Community Discussions
Trending Discussions on dbuf
QUESTION
I am trying to decode RGB buffer into rows suitable for LED RGB matrix using STM32F4 (gcc in SW4STM32 IDE). The code below works perfectly when setting the compiler optimization -O0.
The code produces different result when compiling with -O1 optimization. (also -O2, -O3). The code also produces different result when adding (attribute((packed)) to struct color_t definition with -O1.
The optimization is set to this .c file only, other files are still -O0.
Could someone spot why the optimization changed code logic/behavior ?
...ANSWER
Answered 2020-Aug-23 at 14:16Thanks Zan Lynx. Indeed, if a one is planning to use optimization later, he should put check points to verify that code produces same result with optimization.
The erroneous results above were caused by the pointer calculation. I replaced the two statements above with :
QUESTION
I want to dump chars from a Lora transmitter using Arduino Nano. With this line I assume it can be store the chars into an array:
...ANSWER
Answered 2020-May-15 at 02:28The compiler can only supply the size of an array for you on creation if it has a brace enclosed initializer list. Like this:
QUESTION
I have the following code that checks the query type in the DNS Response, and then further print it accordingly. I need a way to parse CNAME and NS using the parameters given but am unable to do so. Here tmp
is a variable that is defined as tmp = (u_char *)(dpkt->payload + 12);
and dns_label_to_str
is a function to convert DNS Name in string format defined as : *dns_label_to_str(u_char **label, u_char *dest,size_t dest_size,const u_char *payload,const u_char *end)
Code:
...ANSWER
Answered 2018-Oct-12 at 17:23It is not entirely clear to me what the dns_label_to_str
function does, but the most likely meaning of the parameters is:
label
: Pointer to a pointer.*label
initially points to the start of the name in the packet, and is updated to point to the next byte after the name in the packet.dest
: Address of the destination buffer. (This could be a string (text format) or an uncompressed name (wire format).dest
: Length of the destination buffer. Depending on the output format of the function, this should be at least 256 (wire format) or at least 1024 (text format, due to escaping). Of course, the destination buffer must be large enough, t oo.payload
: Pointer to the start of the entire DNS packet (not the data of the current resource record!).end
: Pointer to one past the last byte in th entire DNS packet.
The reason why functions like dns_label_to_str
need to refer to the entire packet is DNS label compression: names can contain a compression reference which points to another, earlier place in the packet, reusing the tail of another name in the packet, at a smaller offset. These references will never point within the resource record data because for CNAME records, it contains only a single name: if compression is used, the name tail must come from somewhere else.
EDIT We have a bit of a debate in the comments about forward compression pointers. BIND 9 rejects them, but a lot of other implementations accept them.
QUESTION
I have written a packet sniffer code everything is working but I want to separate packets from specific IP. To do so i need to access the buffer, which stores the IP address by using inet_ntop(). How can i compare "sbuf/dbuf" with specific IP. I tried by storing the IP in another 'char' array and compare them but it didn't work.
This is my code for IP's of incoming packets;
...ANSWER
Answered 2018-Sep-30 at 20:35You should do it the other way round; convert the IP you are looking for into an integer and compare that directly with ip->saddr
:
QUESTION
In my assignment I was asked to create the Product class, and I have finished all the implementations except the "non-member IO operator". The question I found it very vague, it asks me to overload the <<
and >>
operators to work with ostream and istream to read a Product from and print a Product to the console in order to make this main function work.
Here I see the main function has cout or cin to Product's derived class SItem, I wonder how I should implement the <<
>>
operators to make the main work.
My main:
...ANSWER
Answered 2017-Aug-15 at 08:45You did this wrong in many ways. Best approach in your case is do it like that.
First define interfaces for stream operations, for your products:
QUESTION
I have data laid out in memory in a Structure of Arrays (SoA) or Sturcture of Pointers (SoP) form, and have a way to access that data as though it were laid out in Array of Structure (AoS) form -- code given below.
However, I am not too happy about use of struct AoS_4_SoP
-- although this struct
appears to use templates, it is not really generic since, for example, foo
and bar
are hard-coded inside it.
1) For read-write performance, is AoS access provided as good as the direct SoA access?
2) What would a more generic scheme be? (I have seen quamrana's code here, but it hasn't helped.)
...ANSWER
Answered 2017-Feb-13 at 01:34Here's my adaptation of quamrana's solution for the "inverse" use case (SoA access for AoS):
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