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DATE 2016-11-01

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MESSAGE
DATE 2016-11-14
FROM Ruben Safir
SUBJECT Subject: [Learn] PNG Graphic formats and CRCs
From learn-bounces-at-nylxs.com Mon Nov 14 20:28:50 2016
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From: Ruben Safir
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Subject: [Learn] PNG Graphic formats and CRCs
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First, I just want to apologize for being a bit quiet this last 48 hours.

Years ago, my beloved Grandmother said to me that she was going to die
in the month of July because the heat made her suffer. It was about
correct. For me, I'm going to die this month, in fall. I love the
fall, but in NY I am allergic to something in the environment. It is
likely mode. It can't breath, and suffer horribly. To make it worse,
then I go fishing, the crabs that are stored in coolers, and a breathing
and living vector for infectious disease, and the mold develops all over
there shells. When black fishing, it gets into my eyes and into my
lungs, and this year has been particularly bad. It has created a mucus
plug in my long and I've gotten nearly no sleep this week. I finally
broke down this past 24 hours and I haven't been able to even think
straight. I went to the MD this morning. It has made me appreciate
what my asthma patients have gone through. I couldn't even read today,
let alone to write code.

I've tried to focus what energy I could on the PNG file format. This is
my project for the parallel programming class. I've got to manipulate
this format in parallel and I've try to tackle this also in C++. I had
an arterial motive for choosing this.

When the PNG format came out as a free alternative to the gif format, I
adopted it with excitement. The libraries had bugs in them and I have
many early graphics which I haven't been able to fix with existing
software on Linux, although they do view great with unfixed libs,
including those on non-free platforms. SO in an attempt to fix it, I've
thought I need to explore these files myself and see what I can fix.

In that regard, I've picked up two texts on this topic:

Compressed Image File Formats: JPEG, PNG, GIF, XBM, and BMP - John Miano.

This is a text that is part of the ACM Books, from the SIGGRAPH which is
very cool. As someone who has spent more than a few years organizing
and trying our hand as club based publications, I'm very impressed and
enjoying this text. It happens to be concise and well written.

The other text is an animal book

PNG: The definitive guide - by Greg Roelofs
This is a larger text that covers many uses of PNG files including front
end software like the GIMP and many graphics standards and theories. HE
does include a basic C program that reads PNGs and I will look at that
in detail. I have only a month left to finish this project.

The first challenge I've run into is the discussion of the CRC check.
I'm reading this and see I don't understand how this works. First, it
is a modulo 2 polynominial division on the input data. <<=== that
sentence I don't understand.

The polynumerial that PNG uses is

x^32 + x^26 + x^23 + xx^22 + x16 + x^12 + x^11 + x^10 + x^8 + x^7 + x^5
+ x^4 + x^2 + x + 1

which that say is essentially the value

1 0000 0100 1100 0001 0001 1101 1011 0111 base 2

I can see how this maps, each binary position being affiliated with a
different power from 32 -> 0

I don't know why.

Then it saysin PNG software, the CRC registr is initialized with all
bits set to 1. After the last byte has been processed the final CRC
value is the 1s-complement of the value in the CRC register. And then
there is code

unsigned long CrcRegister ;
void CrcByte (unsigned char data)
{
unsigned int index = (CrcRegister ^ data) & 0xFF ;
CrcRegister = CrcTable [index] ^ ((CrcRegister >> 8) & 0x00FFFFFF) ;
return ;
}

unsigned long Crc (UBYTE1 type [5], UBYTE1 buffer [], unsigned int length)
{
CrcRegister = 0xFFFFFFFFL ;
for (unsigned int ii = 0 ; ii < 4 ; ++ ii)
CrcByte (type [ii]) ;

for (unsigned int jj = 0 ; jj < length ; ++ jj)
CrcByte (buffer [jj]) ;

return ~CrcRegister ;
}

void MakeCrcTable ()
{
for (unsigned int ii = 0 ; ii < 256 ; ++ ii)
{
CrcTable [ii] = ii ;
for (unsigned int jj = 0 ; jj < 8 ; ++ jj)
{
if ((CrcTable [ii] & 0x1) == 0)
CrcTable [ii] >>= 1 ;
else
CrcTable [ii] = 0xEDB88320L ^ (CrcTable [ii] >> 1) ;
}
}
return ;
}


I'm fairly lost on this. There is a collision of a few items of
knowledge but overall, I'd like to understand exactly what this code is
doing.

http://www.nylxs.com/docs/grad_school/parallel/png_cdrom/src/pngdump.cpp


--
So many immigrant groups have swept through our town
that Brooklyn, like Atlantis, reaches mythological
proportions in the mind of the world - RI Safir 1998
http://www.mrbrklyn.com

DRM is THEFT - We are the STAKEHOLDERS - RI Safir 2002
http://www.nylxs.com - Leadership Development in Free Software
http://www2.mrbrklyn.com/resources - Unpublished Archive
http://www.coinhangout.com - coins!
http://www.brooklyn-living.com

Being so tracked is for FARM ANIMALS and and extermination camps,
but incompatible with living as a free human being. -RI Safir 2013
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  1. 2016-11-01 Ruben Safir <ruben-at-mrbrklyn.com> Re: [Learn] how is it indexing in cuda
  2. 2016-11-01 Ruben Safir <ruben.safir-at-my.liu.edu> Re: [Learn] not adequately speced of explained
  3. 2016-11-01 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] how is it indexing in cuda
  4. 2016-11-01 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] not adequately speced of explained
  5. 2016-11-02 Christopher League <league-at-contrapunctus.net> Re: [Learn] Fitch Algorithm - C++
  6. 2016-11-02 Ruben Safir <mrbrklyn-at-panix.com> Re: [Learn] Fitch Algorithm - C++
  7. 2016-11-02 Ruben Safir <ruben-at-mrbrklyn.com> Re: [Learn] how is it indexing in cuda
  8. 2016-11-02 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] Fitch Algorithm - C++
  9. 2016-11-02 IEEE Computer Society <csconnection-at-computer.org> Subject: [Learn] Hear Google's John Martinis Take on Quantum Computing at
  10. 2016-11-02 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] opencl
  11. 2016-11-02 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] scheduled for tommorw
  12. 2016-11-02 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] threads tutorial
  13. 2016-11-03 Ruben Safir <mrbrklyn-at-panix.com> Re: [Learn] Fitch Algorithm - C++
  14. 2016-11-03 Ruben Safir <mrbrklyn-at-panix.com> Re: [Learn] Fitch Algorithm - C++
  15. 2016-11-03 Ruben Safir <mrbrklyn-at-panix.com> Re: [Learn] Fitch Algorithm - C++
  16. 2016-11-03 Christopher League <league-at-contrapunctus.net> Re: [Learn] huffman code
  17. 2016-11-03 Ruben Safir <ruben-at-mrbrklyn.com> Re: [Learn] huffman code
  18. 2016-11-03 Ruben Safir <ruben.safir-at-my.liu.edu> Re: [Learn] huffman code
  19. 2016-11-03 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] Fitch algorithm from the beginning
  20. 2016-11-03 From: <mrbrklyn-at-panix.com> Subject: [Learn] huffman code
  21. 2016-11-03 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] Phenology meeting
  22. 2016-11-03 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] relevant hackathon
  23. 2016-11-03 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] relevant hackathon
  24. 2016-11-04 Ruben Safir <mrbrklyn-at-panix.com> Re: [Learn] huffman code
  25. 2016-11-04 Christopher League <league-at-contrapunctus.net> Subject: [Learn] Fitch/Sankoff
  26. 2016-11-05 Christopher League <league-at-contrapunctus.net> Re: [Learn] Fwd: templates within templates
  27. 2016-11-05 ruben safir <ruben-at-mrbrklyn.com> Subject: [Learn] Fwd: Re: const T vs T const
  28. 2016-11-05 ruben safir <ruben-at-mrbrklyn.com> Subject: [Learn] Fwd: Template Library files and Header linking troubles
  29. 2016-11-05 ruben safir <ruben-at-mrbrklyn.com> Subject: [Learn] Fwd: templates within templates
  30. 2016-11-06 Ruben Safir <mrbrklyn-at-panix.com> Re: [Learn] Fwd: templates within templates
  31. 2016-11-06 Ruben Safir <ruben-at-mrbrklyn.com> Re: [Learn] Fwd: templates within templates
  32. 2016-11-06 Ruben Safir <mrbrklyn-at-panix.com> Re: [Learn] Fwd: templates within templates
  33. 2016-11-06 Christopher League <league-at-contrapunctus.net> Re: [Learn] Fwd: templates within templates
  34. 2016-11-06 Ruben Safir <mrbrklyn-at-panix.com> Re: [Learn] Fwd: templates within templates
  35. 2016-11-06 Ruben Safir <ruben-at-mrbrklyn.com> Re: [Learn] Fwd: templates within templates
  36. 2016-11-06 Ruben Safir <ruben-at-mrbrklyn.com> Re: [Learn] Fwd: templates within templates
  37. 2016-11-06 Ruben Safir <ruben-at-mrbrklyn.com> Re: [Learn] GNU Parallel 20161022 ('Matthew') released [stable]
  38. 2016-11-07 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] templates and ostream for future reference
  39. 2016-11-08 Christopher League <league-at-contrapunctus.net> Re: [Learn] C++ signature ambiguity
  40. 2016-11-08 Ruben Safir <ruben.safir-at-my.liu.edu> Re: [Learn] C++ signature ambiguity
  41. 2016-11-08 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] C++ signature ambiguity
  42. 2016-11-08 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] Fwd: Invitation: Phylogeny meeting -at- Weekly from 10:15 to
  43. 2016-11-08 Ruben Safir <mrbrklyn-at-panix.com> Subject: [Learn] Fwd: [nylug-talk] RSVP open: Wed Nov 16,
  44. 2016-11-09 Christopher League <league-at-contrapunctus.net> Re: [Learn] merge sort parallel hw
  45. 2016-11-09 Ruben Safir <ruben-at-mrbrklyn.com> Re: [Learn] merge sort parallel hw
  46. 2016-11-09 Ruben Safir <ruben-at-mrbrklyn.com> Re: [Learn] merge sort parallel hw
  47. 2016-11-09 Christopher League <league-at-contrapunctus.net> Re: [Learn] merge sort parallel hw
  48. 2016-11-09 Ruben Safir <ruben-at-mrbrklyn.com> Re: [Learn] mergesort tutorial
  49. 2016-11-09 Christopher League <league-at-contrapunctus.net> Re: [Learn] mergesort tutorial
  50. 2016-11-09 Christopher League <league-at-contrapunctus.net> Re: [Learn] namespace and external files confusion
  51. 2016-11-09 Ruben Safir <ruben-at-mrbrklyn.com> Re: [Learn] namespace and external files confusion
  52. 2016-11-09 From: "Carlos R. Mafra" <crmafra-at-gmail.com> Re: [Learn] Question about a small change
  53. 2016-11-09 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] =?utf-8?q?C++_call_of_overloaded_=E2=80=98track=28int*=26?=
  54. 2016-11-09 ruben safir <ruben-at-mrbrklyn.com> Subject: [Learn] Fwd: lost arguments
  55. 2016-11-09 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] Fwd: [dinosaur] Dating origins of dinosaurs,
  56. 2016-11-09 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] merge sort parallel hw
  57. 2016-11-09 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] mergesort tutorial
  58. 2016-11-09 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] namespace and external files confusion
  59. 2016-11-10 Christopher League <league-at-contrapunctus.net> Re: [Learn] merge sort parallel hw
  60. 2016-11-10 Ruben Safir <mrbrklyn-at-panix.com> Re: [Learn] merge sort parallel hw
  61. 2016-11-10 Ruben Safir <mrbrklyn-at-panix.com> Re: [Learn] merge sort parallel hw
  62. 2016-11-10 Ruben Safir <ruben.safir-at-my.liu.edu> Re: [Learn] merge sort parallel hw
  63. 2016-11-10 Ruben Safir <ruben-at-mrbrklyn.com> Re: [Learn] [Hangout-NYLXS] mergesort tutorial
  64. 2016-11-10 Ruben Safir <mrbrklyn-at-panix.com> Subject: [Learn] Fwd: [Hangout-NYLXS] ease your mind- everything in the
  65. 2016-11-10 Ruben Safir <ruben.safir-at-my.liu.edu> Subject: [Learn] Fwd: [Hangout-NYLXS] R Programming Workshop
  66. 2016-11-10 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] Paleocast phenogenetic tree building
  67. 2016-11-11 Christopher League <league-at-contrapunctus.net> Re: [Learn] merge sort parallel hw
  68. 2016-11-12 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] HW of mergesort in parallel
  69. 2016-11-13 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] merge sort in parallel assignment
  70. 2016-11-14 Christopher League <league-at-contrapunctus.net> Re: [Learn] merge sort in parallel assignment
  71. 2016-11-14 Ruben Safir <ruben-at-mrbrklyn.com> Re: [Learn] merge sort in parallel assignment
  72. 2016-11-14 Ruben Safir <ruben-at-mrbrklyn.com> Re: [Learn] merge sort parallel hw
  73. 2016-11-14 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] CUDA and video
  74. 2016-11-14 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] PNG Graphic formats and CRCs
  75. 2016-11-15 ruben safir <ruben-at-mrbrklyn.com> Subject: [Learn] Fwd: PNG coding
  76. 2016-11-15 ruben safir <ruben.safir-at-my.liu.edu> Subject: [Learn] Fwd: PNG Coding
  77. 2016-11-16 Ruben Safir <ruben-at-mrbrklyn.com> Re: [Learn] Fwd: lost arguments
  78. 2016-11-16 Ruben Safir <ruben-at-mrbrklyn.com> Re: [Learn] relevant hackathon
  79. 2016-11-16 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] C++ Workshop Announcement
  80. 2016-11-16 Ruben Safir <mrbrklyn-at-panix.com> Subject: [Learn] Fwd: Re: ref use
  81. 2016-11-16 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] ref use
  82. 2016-11-16 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] why use a reference wrapper int his example
  83. 2016-11-17 Ruben Safir <mrbrklyn-at-panix.com> Re: [Learn] [Hangout-NYLXS] at K&R now
  84. 2016-11-17 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] Fwd: [Hangout-NYLXS] Fwd: PNG Coding
  85. 2016-11-18 ruben safir <ruben-at-mrbrklyn.com> Subject: [Learn] C++ workshop and usenet responses
  86. 2016-11-19 ruben safir <ruben-at-mrbrklyn.com> Subject: [Learn] Fwd: ref use
  87. 2016-11-20 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] when is the constructor called for an object
  88. 2016-11-21 ruben safir <ruben-at-mrbrklyn.com> Subject: [Learn] Fwd: creating a binary tree
  89. 2016-11-21 ruben safir <ruben-at-mrbrklyn.com> Subject: [Learn] Fwd: hidden static
  90. 2016-11-21 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] Fwd: ISBI 2017 Call for Abstracts and Non-Author
  91. 2016-11-21 ruben safir <ruben-at-mrbrklyn.com> Subject: [Learn] Fwd: PNG coding
  92. 2016-11-21 ruben safir <ruben-at-mrbrklyn.com> Subject: [Learn] Fwd: Re: the new {} syntax
  93. 2016-11-21 ruben safir <ruben-at-mrbrklyn.com> Subject: [Learn] Fwd: when is the constructor called for an object
  94. 2016-11-21 ruben safir <ruben-at-mrbrklyn.com> Subject: [Learn] Fwd: when is the constructor called for an object
  95. 2016-11-21 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] Fwd: [dinosaur] Eoconfuciusornis feather keratin and
  96. 2016-11-21 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] look what I found
  97. 2016-11-22 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] Cuccuency book
  98. 2016-11-22 ruben safir <ruben.safir-at-my.liu.edu> Subject: [Learn] declare a func or call an object
  99. 2016-11-22 Ruben Safir <ruben.safir-at-my.liu.edu> Subject: [Learn] Fwd: Re: Using CLIPS as a library
  100. 2016-11-23 Ruben Safir <ruben.safir-at-my.liu.edu> Subject: [Learn] Fwd: Simple C++11 Wrapper for CLIPS 6.30
  101. 2016-11-23 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] Parrelel Programming HW2 with maxpath
  102. 2016-11-24 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] great research news for big data
  103. 2016-11-24 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] mapping algorithms
  104. 2016-11-24 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] Todays meeting
  105. 2016-11-25 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] Fwd: [dinosaur] Flightless theropod phylogenetic variation
  106. 2016-11-26 Ruben Safir <ruben-at-mrbrklyn.com> Re: [Learn] Note to self for Thursday
  107. 2016-11-26 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] Fitch etc
  108. 2016-11-26 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] Note to self for Thursday
  109. 2016-11-26 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] operator<<() overloading details and friend
  110. 2016-11-27 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] 130 year old feathers analysis
  111. 2016-11-27 ruben safir <ruben-at-mrbrklyn.com> Subject: [Learn] Fwd: ACM/SPEC ICPE 2017 - Call for Tutorial Proposals
  112. 2016-11-27 ruben safir <ruben-at-mrbrklyn.com> Subject: [Learn] Fwd: ACM/SPEC ICPE 2017 - Call for Workshop Proposals
  113. 2016-11-27 ruben safir <ruben-at-mrbrklyn.com> Subject: [Learn] Fwd: CfP 22nd Conf. Reliable Software Technologies,
  114. 2016-11-27 ruben safir <ruben-at-mrbrklyn.com> Subject: [Learn] Fwd: Seeking contributors for psyche-c
  115. 2016-11-29 Christopher League <league-at-contrapunctus.net> Re: [Learn] Look at this exciting output by my test program
  116. 2016-11-29 Ruben Safir <ruben-at-mrbrklyn.com> Re: [Learn] Look at this exciting output by my test program
  117. 2016-11-29 Ruben Safir <ruben-at-mrbrklyn.com> Re: [Learn] Look at this exciting output by my test program
  118. 2016-11-29 Christopher League <league-at-contrapunctus.net> Re: [Learn] Quantum Entanglement
  119. 2016-11-29 Ruben Safir <mrbrklyn-at-panix.com> Re: [Learn] Quantum Entanglement
  120. 2016-11-29 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] Here is the paper I was talking out
  121. 2016-11-29 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] Look at this exciting output by my test program
  122. 2016-11-29 nylxs <mrbrklyn-at-optonline.net> Subject: [Learn] Look at this exciting output by my test program
  123. 2016-11-29 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] Quantum Entanglement
  124. 2016-11-29 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] The Death of PBS
  125. 2016-11-29 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] witmer lab ohio and 3d imaging
  126. 2016-11-30 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] phylogenetic crawler

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