1. Geert_Gr...435,695
2. Hypo190,358
3. epasquier119,388
4. ThievingSix114,279
5. MerijnB100,765
6. EddieShip...99,839
7. SteveBay90,270
8. Johnjces76,539
9. rfwoolf72,023
10. ciuly43,806
11. developm...41,920
12. dougaug39,666
13. BdLm36,630
14. JosephGl...33,910
15. 8080_...31,385
16. thiagoblim...31,064
17. senad29,200
18. rllibby28,955
19. aikimark28,882
20. bokist22,565
21. TheRealL...22,394
22. MvanderK...21,400
23. JonasMal...19,980
24. irishbuddha18,800
25. CodedK18,454

1. kretzsch...1,417,314
2. rllibby1,354,947
3. ciuly1,299,984
4. ziolko776,079
5. EddieShip...732,301
6. Geert_Gr...710,012
7. Madshi662,000
8. Slick812645,363
9. geobul628,081
10. mnasman607,055
11. Workshop...558,515
12. TheRealL...544,826
13. inthe514,714
14. MerijnB506,813
15. Ferruccio68442,154
16. mokule431,295
17. mikelittlew...430,856
18. DragonSl...394,371
19. Johnjces344,558
20. Epsylon324,729
21. esoftbg316,932
22. Lee_Nover297,111
23. rwilson293,576
24. developm...284,302
25. Ivanov_G277,736

	[x] Posted via EE Mobile
	Search, ask, and monitor your questions on the go with EE Mobile. Visit Experts Exchange from your mobile device and never be out of touch again.

04/22/2008 at 01:03PM PDT, ID: 23344389

	[x] Attachment Details

[x]

The Solution Rating System

With so many solutions, how can you tell which solutions are most likely to help you and which ones are not? To provide you with a tool to use, we rate our solutions based on various elements that most accurately determine if a solution is a quality solution. To explain what factors affect the solution rating, here are the elements we take into consideration when formulating our solution rating.

The Grade of the Solution
The Zone Rank of the Expert Providing the Solution
The Number of Author and Expert Comments
The Number of Experts Contributing
The Feedback of the Community

Your Input Matters
Because of the way the system is set up, the most important variable in this equation is you. As a member of Experts Exchange, you are able to cast your vote on the quality of the solutions in regard to how complete, accurate, helpful and easy to understand each solution is. When you provide your feedback, each rating is adjusted accordingly. So, if you see a solution that has a poor rating that you think is a good solution, let us know by rating it. As you do, the rating will be adjusted and will become more accurate for other members of our site.

If you have any suggestions that you would like to make for our rating system, please ask a question in the Suggestions Zone of Community Support.

Thank you!

9.6

Bit Manipulation

Asked by nacker2000 in Delphi Programming

Tags: Delphi

Hi all,

I am converting some C code to delphi and I am having some problems with working at the bit level with some routines.

I need to write 16 bits in total, the first 4 bits need to have a value and the last 12 bits need to have a value. It the C example it looks as follows (note that the 4 bits then 12 bits needs to be done twice):

init_put_bits(&pb, buf, buf_size*8);
put_bits(&pb, 4, (block_width/16)-1);
put_bits(&pb, 12, s->image_width);
put_bits(&pb, 4, (block_height/16)-1);
put_bits(&pb, 12, s->image_height);
flush_put_bits(&pb);

You see the first 4 bits is a blocksize and the 12 bits is a width, and then its repeated for the height. This is part of a simple codec I am working on.

Now I understand these are routines in C but suppose I have a memorystream or filestream how would I go about writing 4 bits and then 12 bits to the stream?

If I had a WORD variable to hold the 2 bytes (16-bits) could I build it up that way perhaps, if so how?

Also how would I go about converting the 4 bits and 12 bits to their values, reverse it if you like?

Thanks.

View the Solution FREE for 30 Days

20090824-EE-VQP-74 / EE_QW_2_20070628

Bit Manipulation

Asked by nacker2000 in Delphi Programming

Tags: Delphi

About this solution