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Show Bid Request

Delphi ZLib decompression
Bid Request Id: 58659
Bookmark in my 'To Do' list
Posted by: timvasquez (3 ratings)
(Software buyer rating 10)
Non-action Ratio: Above Average - 33.33%
Buyer Security Verifications: Good
Approved on: Apr 20, 2003
11:22:53 AM EDT
Bidding Closes: Apr 23, 2003
11:30:19 PM EDT
Viewed (by coders): 130 times
Deadline: 4/26/2003 11:59:00 PM
TIME EXPIRED
Phase:
100% of work completed and accepted. Coder has been paid.
Max Accepted Bid: Bidding is closed
Project Type: Very Small Business Project: under $100 (USD)
Bidding Type: Open Auction
Categories: Language Specific, Delphi
Enter chat room for this bid request
(0 active users at Sep 25, 2003 8:56:36 AM EDT)

Description:
1) Coder will develop a customized Delphi ZLib decompression function
which deflates a compressed data file compressed according to ZLib
1.1.3 specifications (with slight changes; see below).

2) Coder is encouraged to use the Borland ZLib library and its
debugged modification by Davide Moretti (http://www.gzip.org/zlib/).
I may consider use of other off-the-shelf ZLib libraries such as
ZLBArchive if coder feels they are more appropriate.

3) Function must ignore extraneous data that may be present at
the beginning of the file. This entails examining the contents
and discarding them until a ZLib header is found. No extraneous
data will follow the compressed block.

4) The source data may use a $789C sequence to signal a new ZLib
header. Function must account for this (see #6 below).

5) The Function call will be
function DecompressFile(inputfilename, outputfilename : string) : err;
where the above filenames are fully qualified paths and filenames,
and err is a coder-defined error result.

6) An exact C port that accomplishes a nearly-identical decompression
can be found at:
http://weather.unisys.com/noaaport/src/ucnids.c
If you are good at porting C to Delphi, this project may take you
about ten minutes!

7) Test data (comprising binary data) can be found at:
Compressed file: http://weather.cod.edu/digatmos/radar/TLX/TLX.BREF1
Decompressed: http://weather.noaa.gov/pub/SL.us008001/DF.of/DC.radar/DS.p19r0/SI.ktlx

8) Code must compile and execute in Delphi 3 and run under Windows 2000.
If you do not have Delphi 3 I will be willing to work with coder
to report compilation errors, which the coder will need to help
resolve to allow Delphi 3 compatibility.

9) This is only a decompression project. A compression counterpart
will not need to be developed.



Deliverables:
1) Complete source code of all work done. The coder may instead supply the work in the form of a small, simple demo app, complete with source code.

2) Installation instructions for the platform(s) specified in this bid request.

3) Complete ownership and distribution copyrights to all work purchased.



Platform:
Must compile under Delphi 3 (Win 2000)

________________________________

OTHER NOTES: Here is some helpful info submitted by a skilled coder who did some preliminary investigative work on this project from the C side of the house. Hope this helps your bid!

"ucnids.c mistakenly claims that it is looking for 789C in the input stream; I fell for this when writing ucrawnids.c, and it is not true.

In reality, it is looking for a zlib control header, which is not necessarily unique over a compressed block. i.e. a perfectly valid zlib header can appear within a compressed block without actually indicating the start of a new block.

I just verified this by trying to count the number of blocks in the file by only looking for zlib control headers. NIDS format.

This is why ucnids.c and ucrawnids.c load TLX.BREF1 into memory either indirectly (by sliding-window buffering) or directly (into a single buffer) to
extract the blocks."


Must be 100% finished and received by buyer on:
Apr 26, 2003 11:59:00 PM EDT
Deadline legal notes: All times are expressed in the time zone of the site EDT (UT - 5). If the buyer omitted a time, then the deadline is 11:59:59 PM EDT on the indicated date.


Remember that contacting the other party outside of the site (by email, phone, etc.) on all business projects < $500 (before the buyer's money is escrowed) is a violation of both the software buyer and seller agreements. We monitor all site activity for such violations and can instantly expel transgressers on the spot, so we thank you in advance for your cooperation. If you notice a violation please help out the site and report it. Thanks for your help.
 
Bidding/Comments:
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See all rejected bids (and all comments)
Name   Bid Amount 
 
Date   Coder Rating  
This bid was accepted by the buyer!
Doyle Markovici
(7 ratings)
in Resita, Caras-Severin
Romania
Bid id: 633,730
 
$20 (USD) Apr 21, 2003
2:27:17 AM EDT
 10
(Excellent)
   
Hello,

My name is Florin and I just wanted to tell you that I can do this in an hour or so. Please tell me if I should start working on it.

Florin

 
 
 
 
  There are 1 private replies to/from Doyle Markovici. Click here to view them.
 




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