Questions tagged [buffer]

A buffer is temporary storage for data or information

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pset1 credit; buffer overflow when converting to char array

My initial idea for the credit problem was to convert the long from get_long into a char array, in order to obtain something iterable to get each digit for Luhn's algo. I recognize that this could be ...
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0answers
140 views

Help with some understanding - Recover

I don't want an explicit solution, but some clarity in my understanding. 1) The buffer. Is using a char or int buffer a hack approach? I thought about typedef byte or block but what's the ...
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1answer
301 views

Pset 4 : Recover, Segmentation fault

I am having problems identifying where i have gone wrong in the below code. On running the program i am getting segmentation fault. i have gone through many related tags and answers but cant ...
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1answer
541 views

CS50 pset4 recover: buffer type and fseek questions

I have figured out a solution to recover, but my first attempt did not work. I'd like to understand a couple of things from my original attempt so I don't repeat the same errors in future code. ...
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1answer
931 views

PSet4, resize.c. Stuck on solution using malloc (recopy)

I am trying to solve pset4/resize.c using the recopy method (i.e. allocating memory and using a buffer to write the line to it and then repeat it). However the final picture only shows black with a ...
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1answer
722 views

Data Type to be used in Buffer for Recover (PSET4)

I'm having a bit of trouble with making the buffer while making recover on PSET4. I have tried a couple different things, but I keep getting the same error regardless of the fix I try: recover.c:25:...
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1answer
486 views

pset4 malloc() approach. Help with size of buffer

I'm having some trouble with the malloc function. I want to make a buffer the size of the new row I'm going to write in the resized file, and this is my approach. I must say that bi.biWidth is ...
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1answer
351 views

pset4 "resize" scanline vertical copies

after days of confusion and reading all the questions posted on this problem I thought I finally understood however I'm still doing something wrong. I believe it revolves around my use of "RGBTRIPLE ...
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2answers
270 views

Command line argument - buffer over read

It was discussed one of the starting lectures that when using main method with command line arguments (int argc, string argv[]) then argv can be used to access memory location which is not intended to ...
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1answer
199 views

|Recover creates only 8 files | fread | pset4|

I'm stuck with recovery program in the pset4. My program recovers 8 files. I can not find out what is wrong with it... Here is the link on Dropbox to the code I'm using. If you notice any error ...
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1answer
902 views

Help me write sexier code : ) counters as pointers, buffering files, feof, sprintf [pset4.recover]

I have completed the pset, and am happy with my code and how it works. But had some design questions so that I know for future programs what and why to use. I understand that it does not really ...
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1answer
461 views

fread not putting what I expect in buffer

for Pset4, recover, I'm trying to read 4 bytes from card.raw into a buffer. I''m testing the first 4 bytes of card.raw with what my buffer contains using gdb, and I'm not getting the same thing. I ...
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1answer
3k views

What data structure do you use to store the buffer in recover?

What data structure do I use to store the 512B blocks in a buffer? Thinking about an array or ints? Or am I completely off?
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1answer
870 views

Pset 5 - Recover

Having problems with recover (pset5) now. This is what I'm doing: Opening File Until the end of file Reading 512 bytes to buffer Checking first 4 bytes of buffer to see if a jpg has just ...