summaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
authorMichael E. Locasto <michael@freshdefense.net>2010-07-18 02:14:34 (GMT)
committer Michael E. Locasto <michael@freshdefense.net>2010-07-18 02:14:34 (GMT)
commit264c0b4413a2f8cb76248859a53d59136ade35d8 (patch)
treee9ff356a7e7decb14e2d073dd7cfe844149fabc8
bootstrap repo; import code from local filesystem
-rw-r--r--code/CONTRIBUTORS9
-rw-r--r--code/COPYING339
-rw-r--r--code/LICENSE339
-rw-r--r--code/README21
-rw-r--r--code/TODO5
-rw-r--r--code/VERSION1
-rw-r--r--code/include/disorder.h62
-rw-r--r--code/man/shannon_H.30
-rw-r--r--code/src/Makefile37
-rw-r--r--code/src/disorder.c188
-rw-r--r--code/test/entropy.pngbin0 -> 9721 bytes
-rw-r--r--code/test/test.c98
-rw-r--r--code/tool/ropy.c153
13 files changed, 1252 insertions, 0 deletions
diff --git a/code/CONTRIBUTORS b/code/CONTRIBUTORS
new file mode 100644
index 0000000..05c00f4
--- /dev/null
+++ b/code/CONTRIBUTORS
@@ -0,0 +1,9 @@
+libdisorder Contributors
+$Id$
+==================================================================
+
+libdisorder was written and produced by Michael E. Locasto
+<michael@freshdefense.net>
+
+The first version of libdisorder was produced on March 4th, 2010.
+
diff --git a/code/COPYING b/code/COPYING
new file mode 100644
index 0000000..8bbcff9
--- /dev/null
+++ b/code/COPYING
@@ -0,0 +1,339 @@
+ GNU GENERAL PUBLIC LICENSE
+ Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.
+ 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+ Preamble
+
+ The licenses for most software are designed to take away your
+freedom to share and change it. By contrast, the GNU General Public
+License is intended to guarantee your freedom to share and change free
+software--to make sure the software is free for all its users. This
+General Public License applies to most of the Free Software
+Foundation's software and to any other program whose authors commit to
+using it. (Some other Free Software Foundation software is covered by
+the GNU Library General Public License instead.) You can apply it to
+your programs, too.
+
+ When we speak of free software, we are referring to freedom, not
+price. Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+this service if you wish), that you receive source code or can get it
+if you want it, that you can change the software or use pieces of it
+in new free programs; and that you know you can do these things.
+
+ To protect your rights, we need to make restrictions that forbid
+anyone to deny you these rights or to ask you to surrender the rights.
+These restrictions translate to certain responsibilities for you if you
+distribute copies of the software, or if you modify it.
+
+ For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must give the recipients all the rights that
+you have. You must make sure that they, too, receive or can get the
+source code. And you must show them these terms so they know their
+rights.
+
+ We protect your rights with two steps: (1) copyright the software, and
+(2) offer you this license which gives you legal permission to copy,
+distribute and/or modify the software.
+
+ Also, for each author's protection and ours, we want to make certain
+that everyone understands that there is no warranty for this free
+software. If the software is modified by someone else and passed on, we
+want its recipients to know that what they have is not the original, so
+that any problems introduced by others will not reflect on the original
+authors' reputations.
+
+ Finally, any free program is threatened constantly by software
+patents. We wish to avoid the danger that redistributors of a free
+program will individually obtain patent licenses, in effect making the
+program proprietary. To prevent this, we have made it clear that any
+patent must be licensed for everyone's free use or not licensed at all.
+
+ The precise terms and conditions for copying, distribution and
+modification follow.
+
+ GNU GENERAL PUBLIC LICENSE
+ TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
+ 0. This License applies to any program or other work which contains
+a notice placed by the copyright holder saying it may be distributed
+under the terms of this General Public License. The "Program", below,
+refers to any such program or work, and a "work based on the Program"
+means either the Program or any derivative work under copyright law:
+that is to say, a work containing the Program or a portion of it,
+either verbatim or with modifications and/or translated into another
+language. (Hereinafter, translation is included without limitation in
+the term "modification".) Each licensee is addressed as "you".
+
+Activities other than copying, distribution and modification are not
+covered by this License; they are outside its scope. The act of
+running the Program is not restricted, and the output from the Program
+is covered only if its contents constitute a work based on the
+Program (independent of having been made by running the Program).
+Whether that is true depends on what the Program does.
+
+ 1. You may copy and distribute verbatim copies of the Program's
+source code as you receive it, in any medium, provided that you
+conspicuously and appropriately publish on each copy an appropriate
+copyright notice and disclaimer of warranty; keep intact all the
+notices that refer to this License and to the absence of any warranty;
+and give any other recipients of the Program a copy of this License
+along with the Program.
+
+You may charge a fee for the physical act of transferring a copy, and
+you may at your option offer warranty protection in exchange for a fee.
+
+ 2. You may modify your copy or copies of the Program or any portion
+of it, thus forming a work based on the Program, and copy and
+distribute such modifications or work under the terms of Section 1
+above, provided that you also meet all of these conditions:
+
+ a) You must cause the modified files to carry prominent notices
+ stating that you changed the files and the date of any change.
+
+ b) You must cause any work that you distribute or publish, that in
+ whole or in part contains or is derived from the Program or any
+ part thereof, to be licensed as a whole at no charge to all third
+ parties under the terms of this License.
+
+ c) If the modified program normally reads commands interactively
+ when run, you must cause it, when started running for such
+ interactive use in the most ordinary way, to print or display an
+ announcement including an appropriate copyright notice and a
+ notice that there is no warranty (or else, saying that you provide
+ a warranty) and that users may redistribute the program under
+ these conditions, and telling the user how to view a copy of this
+ License. (Exception: if the Program itself is interactive but
+ does not normally print such an announcement, your work based on
+ the Program is not required to print an announcement.)
+
+These requirements apply to the modified work as a whole. If
+identifiable sections of that work are not derived from the Program,
+and can be reasonably considered independent and separate works in
+themselves, then this License, and its terms, do not apply to those
+sections when you distribute them as separate works. But when you
+distribute the same sections as part of a whole which is a work based
+on the Program, the distribution of the whole must be on the terms of
+this License, whose permissions for other licensees extend to the
+entire whole, and thus to each and every part regardless of who wrote it.
+
+Thus, it is not the intent of this section to claim rights or contest
+your rights to work written entirely by you; rather, the intent is to
+exercise the right to control the distribution of derivative or
+collective works based on the Program.
+
+In addition, mere aggregation of another work not based on the Program
+with the Program (or with a work based on the Program) on a volume of
+a storage or distribution medium does not bring the other work under
+the scope of this License.
+
+ 3. You may copy and distribute the Program (or a work based on it,
+under Section 2) in object code or executable form under the terms of
+Sections 1 and 2 above provided that you also do one of the following:
+
+ a) Accompany it with the complete corresponding machine-readable
+ source code, which must be distributed under the terms of Sections
+ 1 and 2 above on a medium customarily used for software interchange; or,
+
+ b) Accompany it with a written offer, valid for at least three
+ years, to give any third party, for a charge no more than your
+ cost of physically performing source distribution, a complete
+ machine-readable copy of the corresponding source code, to be
+ distributed under the terms of Sections 1 and 2 above on a medium
+ customarily used for software interchange; or,
+
+ c) Accompany it with the information you received as to the offer
+ to distribute corresponding source code. (This alternative is
+ allowed only for noncommercial distribution and only if you
+ received the program in object code or executable form with such
+ an offer, in accord with Subsection b above.)
+
+The source code for a work means the preferred form of the work for
+making modifications to it. For an executable work, complete source
+code means all the source code for all modules it contains, plus any
+associated interface definition files, plus the scripts used to
+control compilation and installation of the executable. However, as a
+special exception, the source code distributed need not include
+anything that is normally distributed (in either source or binary
+form) with the major components (compiler, kernel, and so on) of the
+operating system on which the executable runs, unless that component
+itself accompanies the executable.
+
+If distribution of executable or object code is made by offering
+access to copy from a designated place, then offering equivalent
+access to copy the source code from the same place counts as
+distribution of the source code, even though third parties are not
+compelled to copy the source along with the object code.
+
+ 4. You may not copy, modify, sublicense, or distribute the Program
+except as expressly provided under this License. Any attempt
+otherwise to copy, modify, sublicense or distribute the Program is
+void, and will automatically terminate your rights under this License.
+However, parties who have received copies, or rights, from you under
+this License will not have their licenses terminated so long as such
+parties remain in full compliance.
+
+ 5. You are not required to accept this License, since you have not
+signed it. However, nothing else grants you permission to modify or
+distribute the Program or its derivative works. These actions are
+prohibited by law if you do not accept this License. Therefore, by
+modifying or distributing the Program (or any work based on the
+Program), you indicate your acceptance of this License to do so, and
+all its terms and conditions for copying, distributing or modifying
+the Program or works based on it.
+
+ 6. Each time you redistribute the Program (or any work based on the
+Program), the recipient automatically receives a license from the
+original licensor to copy, distribute or modify the Program subject to
+these terms and conditions. You may not impose any further
+restrictions on the recipients' exercise of the rights granted herein.
+You are not responsible for enforcing compliance by third parties to
+this License.
+
+ 7. If, as a consequence of a court judgment or allegation of patent
+infringement or for any other reason (not limited to patent issues),
+conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License. If you cannot
+distribute so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you
+may not distribute the Program at all. For example, if a patent
+license would not permit royalty-free redistribution of the Program by
+all those who receive copies directly or indirectly through you, then
+the only way you could satisfy both it and this License would be to
+refrain entirely from distribution of the Program.
+
+If any portion of this section is held invalid or unenforceable under
+any particular circumstance, the balance of the section is intended to
+apply and the section as a whole is intended to apply in other
+circumstances.
+
+It is not the purpose of this section to induce you to infringe any
+patents or other property right claims or to contest validity of any
+such claims; this section has the sole purpose of protecting the
+integrity of the free software distribution system, which is
+implemented by public license practices. Many people have made
+generous contributions to the wide range of software distributed
+through that system in reliance on consistent application of that
+system; it is up to the author/donor to decide if he or she is willing
+to distribute software through any other system and a licensee cannot
+impose that choice.
+
+This section is intended to make thoroughly clear what is believed to
+be a consequence of the rest of this License.
+
+ 8. If the distribution and/or use of the Program is restricted in
+certain countries either by patents or by copyrighted interfaces, the
+original copyright holder who places the Program under this License
+may add an explicit geographical distribution limitation excluding
+those countries, so that distribution is permitted only in or among
+countries not thus excluded. In such case, this License incorporates
+the limitation as if written in the body of this License.
+
+ 9. The Free Software Foundation may publish revised and/or new versions
+of the General Public License from time to time. Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+Each version is given a distinguishing version number. If the Program
+specifies a version number of this License which applies to it and "any
+later version", you have the option of following the terms and conditions
+either of that version or of any later version published by the Free
+Software Foundation. If the Program does not specify a version number of
+this License, you may choose any version ever published by the Free Software
+Foundation.
+
+ 10. If you wish to incorporate parts of the Program into other free
+programs whose distribution conditions are different, write to the author
+to ask for permission. For software which is copyrighted by the Free
+Software Foundation, write to the Free Software Foundation; we sometimes
+make exceptions for this. Our decision will be guided by the two goals
+of preserving the free status of all derivatives of our free software and
+of promoting the sharing and reuse of software generally.
+
+ NO WARRANTY
+
+ 11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
+FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN
+OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
+PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
+OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS
+TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE
+PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
+REPAIR OR CORRECTION.
+
+ 12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
+REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
+INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
+OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
+TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
+YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
+PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGES.
+
+ END OF TERMS AND CONDITIONS
+
+ How to Apply These Terms to Your New Programs
+
+ If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+ To do so, attach the following notices to the program. It is safest
+to attach them to the start of each source file to most effectively
+convey the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+ <one line to give the program's name and a brief idea of what it does.>
+ Copyright (C) <year> <name of author>
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+
+Also add information on how to contact you by electronic and paper mail.
+
+If the program is interactive, make it output a short notice like this
+when it starts in an interactive mode:
+
+ Gnomovision version 69, Copyright (C) year name of author
+ Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+ This is free software, and you are welcome to redistribute it
+ under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License. Of course, the commands you use may
+be called something other than `show w' and `show c'; they could even be
+mouse-clicks or menu items--whatever suits your program.
+
+You should also get your employer (if you work as a programmer) or your
+school, if any, to sign a "copyright disclaimer" for the program, if
+necessary. Here is a sample; alter the names:
+
+ Yoyodyne, Inc., hereby disclaims all copyright interest in the program
+ `Gnomovision' (which makes passes at compilers) written by James Hacker.
+
+ <signature of Ty Coon>, 1 April 1989
+ Ty Coon, President of Vice
+
+This General Public License does not permit incorporating your program into
+proprietary programs. If your program is a subroutine library, you may
+consider it more useful to permit linking proprietary applications with the
+library. If this is what you want to do, use the GNU Library General
+Public License instead of this License.
diff --git a/code/LICENSE b/code/LICENSE
new file mode 100644
index 0000000..8bbcff9
--- /dev/null
+++ b/code/LICENSE
@@ -0,0 +1,339 @@
+ GNU GENERAL PUBLIC LICENSE
+ Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.
+ 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+ Preamble
+
+ The licenses for most software are designed to take away your
+freedom to share and change it. By contrast, the GNU General Public
+License is intended to guarantee your freedom to share and change free
+software--to make sure the software is free for all its users. This
+General Public License applies to most of the Free Software
+Foundation's software and to any other program whose authors commit to
+using it. (Some other Free Software Foundation software is covered by
+the GNU Library General Public License instead.) You can apply it to
+your programs, too.
+
+ When we speak of free software, we are referring to freedom, not
+price. Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+this service if you wish), that you receive source code or can get it
+if you want it, that you can change the software or use pieces of it
+in new free programs; and that you know you can do these things.
+
+ To protect your rights, we need to make restrictions that forbid
+anyone to deny you these rights or to ask you to surrender the rights.
+These restrictions translate to certain responsibilities for you if you
+distribute copies of the software, or if you modify it.
+
+ For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must give the recipients all the rights that
+you have. You must make sure that they, too, receive or can get the
+source code. And you must show them these terms so they know their
+rights.
+
+ We protect your rights with two steps: (1) copyright the software, and
+(2) offer you this license which gives you legal permission to copy,
+distribute and/or modify the software.
+
+ Also, for each author's protection and ours, we want to make certain
+that everyone understands that there is no warranty for this free
+software. If the software is modified by someone else and passed on, we
+want its recipients to know that what they have is not the original, so
+that any problems introduced by others will not reflect on the original
+authors' reputations.
+
+ Finally, any free program is threatened constantly by software
+patents. We wish to avoid the danger that redistributors of a free
+program will individually obtain patent licenses, in effect making the
+program proprietary. To prevent this, we have made it clear that any
+patent must be licensed for everyone's free use or not licensed at all.
+
+ The precise terms and conditions for copying, distribution and
+modification follow.
+
+ GNU GENERAL PUBLIC LICENSE
+ TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
+ 0. This License applies to any program or other work which contains
+a notice placed by the copyright holder saying it may be distributed
+under the terms of this General Public License. The "Program", below,
+refers to any such program or work, and a "work based on the Program"
+means either the Program or any derivative work under copyright law:
+that is to say, a work containing the Program or a portion of it,
+either verbatim or with modifications and/or translated into another
+language. (Hereinafter, translation is included without limitation in
+the term "modification".) Each licensee is addressed as "you".
+
+Activities other than copying, distribution and modification are not
+covered by this License; they are outside its scope. The act of
+running the Program is not restricted, and the output from the Program
+is covered only if its contents constitute a work based on the
+Program (independent of having been made by running the Program).
+Whether that is true depends on what the Program does.
+
+ 1. You may copy and distribute verbatim copies of the Program's
+source code as you receive it, in any medium, provided that you
+conspicuously and appropriately publish on each copy an appropriate
+copyright notice and disclaimer of warranty; keep intact all the
+notices that refer to this License and to the absence of any warranty;
+and give any other recipients of the Program a copy of this License
+along with the Program.
+
+You may charge a fee for the physical act of transferring a copy, and
+you may at your option offer warranty protection in exchange for a fee.
+
+ 2. You may modify your copy or copies of the Program or any portion
+of it, thus forming a work based on the Program, and copy and
+distribute such modifications or work under the terms of Section 1
+above, provided that you also meet all of these conditions:
+
+ a) You must cause the modified files to carry prominent notices
+ stating that you changed the files and the date of any change.
+
+ b) You must cause any work that you distribute or publish, that in
+ whole or in part contains or is derived from the Program or any
+ part thereof, to be licensed as a whole at no charge to all third
+ parties under the terms of this License.
+
+ c) If the modified program normally reads commands interactively
+ when run, you must cause it, when started running for such
+ interactive use in the most ordinary way, to print or display an
+ announcement including an appropriate copyright notice and a
+ notice that there is no warranty (or else, saying that you provide
+ a warranty) and that users may redistribute the program under
+ these conditions, and telling the user how to view a copy of this
+ License. (Exception: if the Program itself is interactive but
+ does not normally print such an announcement, your work based on
+ the Program is not required to print an announcement.)
+
+These requirements apply to the modified work as a whole. If
+identifiable sections of that work are not derived from the Program,
+and can be reasonably considered independent and separate works in
+themselves, then this License, and its terms, do not apply to those
+sections when you distribute them as separate works. But when you
+distribute the same sections as part of a whole which is a work based
+on the Program, the distribution of the whole must be on the terms of
+this License, whose permissions for other licensees extend to the
+entire whole, and thus to each and every part regardless of who wrote it.
+
+Thus, it is not the intent of this section to claim rights or contest
+your rights to work written entirely by you; rather, the intent is to
+exercise the right to control the distribution of derivative or
+collective works based on the Program.
+
+In addition, mere aggregation of another work not based on the Program
+with the Program (or with a work based on the Program) on a volume of
+a storage or distribution medium does not bring the other work under
+the scope of this License.
+
+ 3. You may copy and distribute the Program (or a work based on it,
+under Section 2) in object code or executable form under the terms of
+Sections 1 and 2 above provided that you also do one of the following:
+
+ a) Accompany it with the complete corresponding machine-readable
+ source code, which must be distributed under the terms of Sections
+ 1 and 2 above on a medium customarily used for software interchange; or,
+
+ b) Accompany it with a written offer, valid for at least three
+ years, to give any third party, for a charge no more than your
+ cost of physically performing source distribution, a complete
+ machine-readable copy of the corresponding source code, to be
+ distributed under the terms of Sections 1 and 2 above on a medium
+ customarily used for software interchange; or,
+
+ c) Accompany it with the information you received as to the offer
+ to distribute corresponding source code. (This alternative is
+ allowed only for noncommercial distribution and only if you
+ received the program in object code or executable form with such
+ an offer, in accord with Subsection b above.)
+
+The source code for a work means the preferred form of the work for
+making modifications to it. For an executable work, complete source
+code means all the source code for all modules it contains, plus any
+associated interface definition files, plus the scripts used to
+control compilation and installation of the executable. However, as a
+special exception, the source code distributed need not include
+anything that is normally distributed (in either source or binary
+form) with the major components (compiler, kernel, and so on) of the
+operating system on which the executable runs, unless that component
+itself accompanies the executable.
+
+If distribution of executable or object code is made by offering
+access to copy from a designated place, then offering equivalent
+access to copy the source code from the same place counts as
+distribution of the source code, even though third parties are not
+compelled to copy the source along with the object code.
+
+ 4. You may not copy, modify, sublicense, or distribute the Program
+except as expressly provided under this License. Any attempt
+otherwise to copy, modify, sublicense or distribute the Program is
+void, and will automatically terminate your rights under this License.
+However, parties who have received copies, or rights, from you under
+this License will not have their licenses terminated so long as such
+parties remain in full compliance.
+
+ 5. You are not required to accept this License, since you have not
+signed it. However, nothing else grants you permission to modify or
+distribute the Program or its derivative works. These actions are
+prohibited by law if you do not accept this License. Therefore, by
+modifying or distributing the Program (or any work based on the
+Program), you indicate your acceptance of this License to do so, and
+all its terms and conditions for copying, distributing or modifying
+the Program or works based on it.
+
+ 6. Each time you redistribute the Program (or any work based on the
+Program), the recipient automatically receives a license from the
+original licensor to copy, distribute or modify the Program subject to
+these terms and conditions. You may not impose any further
+restrictions on the recipients' exercise of the rights granted herein.
+You are not responsible for enforcing compliance by third parties to
+this License.
+
+ 7. If, as a consequence of a court judgment or allegation of patent
+infringement or for any other reason (not limited to patent issues),
+conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License. If you cannot
+distribute so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you
+may not distribute the Program at all. For example, if a patent
+license would not permit royalty-free redistribution of the Program by
+all those who receive copies directly or indirectly through you, then
+the only way you could satisfy both it and this License would be to
+refrain entirely from distribution of the Program.
+
+If any portion of this section is held invalid or unenforceable under
+any particular circumstance, the balance of the section is intended to
+apply and the section as a whole is intended to apply in other
+circumstances.
+
+It is not the purpose of this section to induce you to infringe any
+patents or other property right claims or to contest validity of any
+such claims; this section has the sole purpose of protecting the
+integrity of the free software distribution system, which is
+implemented by public license practices. Many people have made
+generous contributions to the wide range of software distributed
+through that system in reliance on consistent application of that
+system; it is up to the author/donor to decide if he or she is willing
+to distribute software through any other system and a licensee cannot
+impose that choice.
+
+This section is intended to make thoroughly clear what is believed to
+be a consequence of the rest of this License.
+
+ 8. If the distribution and/or use of the Program is restricted in
+certain countries either by patents or by copyrighted interfaces, the
+original copyright holder who places the Program under this License
+may add an explicit geographical distribution limitation excluding
+those countries, so that distribution is permitted only in or among
+countries not thus excluded. In such case, this License incorporates
+the limitation as if written in the body of this License.
+
+ 9. The Free Software Foundation may publish revised and/or new versions
+of the General Public License from time to time. Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+Each version is given a distinguishing version number. If the Program
+specifies a version number of this License which applies to it and "any
+later version", you have the option of following the terms and conditions
+either of that version or of any later version published by the Free
+Software Foundation. If the Program does not specify a version number of
+this License, you may choose any version ever published by the Free Software
+Foundation.
+
+ 10. If you wish to incorporate parts of the Program into other free
+programs whose distribution conditions are different, write to the author
+to ask for permission. For software which is copyrighted by the Free
+Software Foundation, write to the Free Software Foundation; we sometimes
+make exceptions for this. Our decision will be guided by the two goals
+of preserving the free status of all derivatives of our free software and
+of promoting the sharing and reuse of software generally.
+
+ NO WARRANTY
+
+ 11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
+FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN
+OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
+PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
+OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS
+TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE
+PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
+REPAIR OR CORRECTION.
+
+ 12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
+REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
+INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
+OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
+TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
+YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
+PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGES.
+
+ END OF TERMS AND CONDITIONS
+
+ How to Apply These Terms to Your New Programs
+
+ If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+ To do so, attach the following notices to the program. It is safest
+to attach them to the start of each source file to most effectively
+convey the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+ <one line to give the program's name and a brief idea of what it does.>
+ Copyright (C) <year> <name of author>
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+
+Also add information on how to contact you by electronic and paper mail.
+
+If the program is interactive, make it output a short notice like this
+when it starts in an interactive mode:
+
+ Gnomovision version 69, Copyright (C) year name of author
+ Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+ This is free software, and you are welcome to redistribute it
+ under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License. Of course, the commands you use may
+be called something other than `show w' and `show c'; they could even be
+mouse-clicks or menu items--whatever suits your program.
+
+You should also get your employer (if you work as a programmer) or your
+school, if any, to sign a "copyright disclaimer" for the program, if
+necessary. Here is a sample; alter the names:
+
+ Yoyodyne, Inc., hereby disclaims all copyright interest in the program
+ `Gnomovision' (which makes passes at compilers) written by James Hacker.
+
+ <signature of Ty Coon>, 1 April 1989
+ Ty Coon, President of Vice
+
+This General Public License does not permit incorporating your program into
+proprietary programs. If your program is a subroutine library, you may
+consider it more useful to permit linking proprietary applications with the
+library. If this is what you want to do, use the GNU Library General
+Public License instead of this License.
diff --git a/code/README b/code/README
new file mode 100644
index 0000000..a2a1709
--- /dev/null
+++ b/code/README
@@ -0,0 +1,21 @@
+libdisorder: entropy measurement
+$Id$
+----------------------------------------------------------------------------
+
+This is a readme file. See
+
+ http://www.cs.gmu.edu/~mlocasto/research/libdisorder
+
+for more information.
+
+libdisorder is a small, simple C library for use by programmars in
+other programs. There is a small test program included that opens
+/dev/urandom and calls libdisorder.
+
+You will probably want to pipe the output of libdisorder to some other
+math analysis or graphing environment. In *nix, you can use gnuplot.
+
+The library's primary function reports entropy in bits: essentially,
+this is the number of bits necessary to encode the actual level of
+information contained in the data passed to the library: it is the
+theoretical maximum amount of compression possible. \ No newline at end of file
diff --git a/code/TODO b/code/TODO
new file mode 100644
index 0000000..d2c6543
--- /dev/null
+++ b/code/TODO
@@ -0,0 +1,5 @@
+
+[20100308] Add a command line tool for reporting entropy of a file
+[20100308] supply file argument
+[20100308] supply verbose argument
+[XXX] supply parameter for selecting entropy measure
diff --git a/code/VERSION b/code/VERSION
new file mode 100644
index 0000000..4e379d2
--- /dev/null
+++ b/code/VERSION
@@ -0,0 +1 @@
+0.0.2
diff --git a/code/include/disorder.h b/code/include/disorder.h
new file mode 100644
index 0000000..3458774
--- /dev/null
+++ b/code/include/disorder.h
@@ -0,0 +1,62 @@
+/***************************************************************************
+ * libdisorder: A Library for Measuring Byte Stream Entropy
+ * Copyright (C) 2010 Michael E. Locasto
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the:
+ * Free Software Foundation, Inc.
+ * 59 Temple Place, Suite 330
+ * Boston, MA 02111-1307 USA
+ *
+ * $Id$
+ **************************************************************************/
+
+#ifndef __DISORDER_H_
+#define __DISORDER_H_
+
+/** Max number of bytes (i.e., tokens) */
+#define LIBDO_MAX_BYTES 256
+
+/** A convienance value for clients of this library. Feel free to change
+ * if you plan to use a larger buffer. You can also safely ignore it, as
+ * libdisorder does not use this value internally; it relies on the
+ * client-supplied `length' parameter.
+ *
+ * NB: Might become deprecated because it is potentially misleading and
+ * has zero relationship to any library internal state.
+ */
+#define LIBDO_BUFFER_LEN 16384
+
+/**
+ * Given a pointer to an array of bytes, return a float indicating the
+ * level of entropy in bits (a number between zero and eight),
+ * assuming a space of 256 possible byte values. The second argument
+ * indicates the number of bytes in the sequence. If this sequence
+ * runs into unallocated memory, this function should fail with a
+ * SIGSEGV.
+ */
+float shannon_H(char*, long long);
+
+/** Report the number of (unique) tokens seen. This is _not_ the
+ number of individual events seen. For example, if the library sees
+ the string `aaab', the number of events is 4 and the number of
+ tokens is 2. */
+int get_num_tokens(void);
+
+/** Returns maximum entropy for byte distributions log2(256)=8 bits*/
+float get_max_entropy(void);
+
+/** Returns the ratio of entropy to maxentropy */
+float get_entropy_ratio(void);
+
+#endif
diff --git a/code/man/shannon_H.3 b/code/man/shannon_H.3
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/code/man/shannon_H.3
diff --git a/code/src/Makefile b/code/src/Makefile
new file mode 100644
index 0000000..ba38e11
--- /dev/null
+++ b/code/src/Makefile
@@ -0,0 +1,37 @@
+LDFLAGS=-L../lib -L/usr/lib
+INCLUDES=-I/usr/include -I../include
+LIBS=-ldisorder
+#OPTS=-Wall -g -pg
+OPTS=-Wall -g
+TESTOUT=../test/testexec
+TESTSRC=../test/test.c
+TOOLOUT=../tool/ropy
+TOOLSRC=../tool/ropy.c
+
+all: disorder library test tool
+
+library: libdisorder.a
+
+libdisorder.a: disorder.o
+ ar rc $@ disorder.o
+ mkdir -p ../lib
+ mv libdisorder.a ../lib
+
+disorder: disorder.c ../include/disorder.h
+ gcc $(OPTS) -c disorder.c
+
+test: ../test/test.c
+ gcc $(OPTS) $(LDFLAGS) $(INCLUDES) -o $(TESTOUT) $(TESTSRC) $(LIBS)
+
+tool: ../tool/ropy.c
+ gcc $(OPTS) $(LDFLAGS) $(INCLUDES) -o $(TOOLOUT) $(TOOLSRC) $(LIBS)
+
+clean:
+ @/bin/rm -f *~ *.o *.a $(TESTOUT) $(TOOLOUT)
+ @/bin/rm -f ../test/*~
+ @/bin/rm -f ../tool/*~
+ @/bin/rm -Rf ../test/testexec.dSYM/
+ @/bin/rm -Rf ../tool/ropy.dSYM/
+ @/bin/rm -f ../include/*~
+ @/bin/rm -f ../lib/*.a
+ @/bin/rm -f ../*~ \ No newline at end of file
diff --git a/code/src/disorder.c b/code/src/disorder.c
new file mode 100644
index 0000000..9d297e5
--- /dev/null
+++ b/code/src/disorder.c
@@ -0,0 +1,188 @@
+/***************************************************************************
+ * libdisorder: A Library for Measuring Byte Stream Entropy
+ * Copyright (C) 2010 Michael E. Locasto
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the:
+ * Free Software Foundation, Inc.
+ * 59 Temple Place, Suite 330
+ * Boston, MA 02111-1307 USA
+ *
+ * $Id$
+ **************************************************************************/
+
+#include <math.h> //for log2()
+#include <stdio.h> //for NULL
+#include "../include/disorder.h"
+
+/** Frequecies for each byte */
+static int m_token_freqs[LIBDO_MAX_BYTES]; //frequency of each token in sample
+static float m_token_probs[LIBDO_MAX_BYTES]; //P(each token appearing)
+static int m_num_tokens = 0; //actual number of `seen' tokens, max 256
+static float m_maxent = 0.0;
+static float m_ratio = 0.0;
+static int LIBDISORDER_INITIALIZED = 0;
+
+static void
+initialize_lib()
+{
+ int i = 0;
+ if(1==LIBDISORDER_INITIALIZED)
+ return;
+
+ m_num_tokens = 0;
+
+ for(i=0;i<LIBDO_MAX_BYTES;i++)
+ {
+ m_token_freqs[i]=0;
+ m_token_probs[i]=0.0;
+ }
+
+ LIBDISORDER_INITIALIZED = 1;
+}
+
+/**
+ * Set m_num_tokens by iterating over m_token_freq[] and maintaining
+ * a counter of each position that does not hold the value of zero.
+ */
+static void
+count_num_tokens()
+{
+ int i = 0;
+ int counter = 0;
+ for(i=0;i<LIBDO_MAX_BYTES;i++)
+ {
+ if(0!=m_token_freqs[i])
+ {
+ counter++;
+ }
+ }
+ m_num_tokens = counter;
+ return;
+}
+
+/**
+ * Sum frequencies for each token (i.e., byte values 0 through 255)
+ * We assume the `length' parameter is correct.
+ *
+ * This function is available only to functions in this file.
+ */
+static void
+get_token_frequencies(char* buf,
+ long long length)
+{
+ int i=0;
+ char* itr=NULL;
+ unsigned char c=0;
+
+ itr = buf;
+
+ //reset number of tokens
+ m_num_tokens = 0;
+
+ //make sure freqency and probability arrays are cleared
+ for(i=0;i<LIBDO_MAX_BYTES;i++)
+ {
+ m_token_freqs[i] = 0;
+ m_token_probs[i] = 0.0;
+ }
+
+ for(i=0;i<length;i++)
+ {
+ c = (unsigned char)*itr;
+ //assert(0<=c<LIBDO_MAX_BYTES);
+ m_token_freqs[c]++;
+ itr++;
+ }
+}
+
+/**
+ * Return entropy (in bits) of this buffer of bytes. We assume that the
+ * `length' parameter is correct. This implementation is a translation
+ * of the PHP code found here:
+ *
+ * http://onlamp.com/pub/a/php/2005/01/06/entropy.html
+ *
+ * with a helpful hint on the `foreach' statement from here:
+ *
+ * http://php.net/manual/en/control-structures.foreach.php
+ */
+float
+shannon_H(char* buf,
+ long long length)
+{
+ int i = 0;
+ float bits = 0.0;
+ char* itr=NULL; //values of itr should be zero to 255
+ unsigned char token;
+ int num_events = 0; //`length' parameter
+ float freq = 0.0; //loop variable for holding freq from m_token_freq[]
+ float entropy = 0.0; //running entropy sum
+
+ if(NULL==buf || 0==length)
+ return 0.0;
+
+ if(0==LIBDISORDER_INITIALIZED)
+ initialize_lib();
+
+ itr = buf;
+ m_maxent = 0.0;
+ m_ratio = 0.0;
+ num_events = length;
+ get_token_frequencies(itr, num_events); //modifies m_token_freqs[]
+ //set m_num_tokens by counting unique m_token_freqs entries
+ count_num_tokens();
+
+ if(m_num_tokens>LIBDO_MAX_BYTES)
+ {
+ //report error somehow?
+ return 0.0;
+ }
+
+ //iterate through whole m_token_freq array, but only count
+ //spots that have a registered token (i.e., freq>0)
+ for(i=0;i<LIBDO_MAX_BYTES;i++)
+ {
+ if(0!=m_token_freqs[i])
+ {
+ token = i;
+ freq = ((float)m_token_freqs[token]);
+ m_token_probs[token] = (freq / ((float)num_events));
+ entropy += m_token_probs[token] * log2(m_token_probs[token]);
+ }
+ }
+
+ bits = -1.0 * entropy;
+ m_maxent = log2(m_num_tokens);
+ m_ratio = bits / m_maxent;
+
+ return bits;
+}
+
+int
+get_num_tokens()
+{
+ return m_num_tokens;
+}
+
+float
+get_max_entropy()
+{
+ return m_maxent;
+}
+
+float
+get_entropy_ratio()
+{
+ return m_ratio;
+}
diff --git a/code/test/entropy.png b/code/test/entropy.png
new file mode 100644
index 0000000..bc24a99
--- /dev/null
+++ b/code/test/entropy.png
Binary files differ
diff --git a/code/test/test.c b/code/test/test.c
new file mode 100644
index 0000000..5124886
--- /dev/null
+++ b/code/test/test.c
@@ -0,0 +1,98 @@
+/***************************************************************************
+ * libdisorder: A Library for Measuring Byte Stream Entropy
+ * Copyright (C) 2010 Michael E. Locasto
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the:
+ * Free Software Foundation, Inc.
+ * 59 Temple Place, Suite 330
+ * Boston, MA 02111-1307 USA
+ *
+ * $Id$
+ **************************************************************************/
+
+#include "../include/disorder.h"
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#define LIMIT LIBDO_BUFFER_LEN
+
+/**
+ * Open and read /dev/urandom, filling a buffer of size LIMIT. After
+ * filing the buffer, calculate the entropy of the buffer. Repeat
+ * forever.
+ *
+ */
+int
+main(int argc,
+ char* argv[])
+{
+ float entropy_value = 0.0;
+ long long current_run = 0L;
+ char* buffer = NULL;
+ unsigned char c;
+ int x = 0;
+ FILE* fin=NULL;
+ char* itr=NULL;
+ int i = 0;
+
+ fin = fopen("/dev/urandom","r");
+ if(NULL==fin)
+ {
+ perror("main():");
+ return -1;
+ }
+
+ buffer = (char*)calloc(LIMIT, sizeof(char));
+ if(NULL==buffer)
+ {
+ perror("main():");
+ return -2;
+ }
+
+ for(;;)
+ {
+ itr = buffer;
+ for(i=0;i<LIMIT;i++)
+ {
+ x = fgetc(fin);
+ c = (unsigned char)x;
+ *itr=c;
+ itr++;
+ }
+ //NB: doing this caluculation here may allow /dev/unrandom to
+ //recover sufficiently to never show a decrease in entropy.
+ //Using a larger buffer or using another thread to perform this
+ //calculation while the main thread continues to fill the buffer
+ //may provide the ability to observe a decrease in entropy.
+ entropy_value = shannon_H(buffer, LIMIT);
+ fprintf(stdout,
+ "[%8lld] entropy: %f maxent: %f ratio: %f\n",
+ current_run,
+ entropy_value,
+ get_max_entropy(),
+ get_entropy_ratio()
+ );
+ current_run++;
+ fflush(stdout);
+ }
+
+ free(buffer);
+ buffer=NULL;
+ if(EOF!=fclose(fin))
+ perror("exiting main():");
+ fin=NULL;
+
+ return 0;
+}
diff --git a/code/tool/ropy.c b/code/tool/ropy.c
new file mode 100644
index 0000000..02999ae
--- /dev/null
+++ b/code/tool/ropy.c
@@ -0,0 +1,153 @@
+/***************************************************************************
+ * libdisorder: A Library for Measuring Byte Stream Entropy
+ * Copyright (C) 2010 Michael E. Locasto
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the:
+ * Free Software Foundation, Inc.
+ * 59 Temple Place, Suite 330
+ * Boston, MA 02111-1307 USA
+ *
+ * $Id$
+ **************************************************************************/
+
+#include "../include/disorder.h"
+#include <sys/stat.h> // to get file size in bytes for buffer
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+
+static void
+do_usage()
+{
+ fprintf(stderr,
+ "ropy [filename]\n");
+ fprintf(stderr,
+ "ropy -v [filename]\n");
+}
+
+/**
+ * Open and read a file, filling a buffer. After filing the buffer,
+ * calculate the entropy of the buffer. Output the entropy of the file
+ * in bits.
+ *
+ * An attacker could cause this program to read in a large number of
+ * bytes or allocate a large amount of memory by supplying a large
+ * file.
+ *
+ * Usage:
+ * ./ropy [-v] [file]
+ */
+int
+main(int argc,
+ char* argv[])
+{
+ float entropy_value = 0.0;
+ char* filename = NULL;
+ int fildes = -1;
+ FILE* fin=NULL;
+ struct stat stat_fd;
+ long long file_size;
+ char* buffer = NULL;
+ unsigned char c;
+ int x = 0;
+ char* itr=NULL;
+ //long long i = 0;
+ long long how_many_bytes_read = 0L;
+ int ret = 0;
+ int verbose = 0; //be quiet by default
+
+ if(2==argc)
+ {
+ //point filename to argv[1]; no copying.
+ filename = argv[1];
+ }else if(3==argc){
+ if(0==strncmp(argv[1],"-v",2))
+ {
+ verbose = 1;
+ filename = argv[2];
+ }else{
+ do_usage();
+ }
+ }else if(1==argc){
+ //assume stdin is being piped to us
+ //how to handle fstat in this case?
+ }else{
+ do_usage();
+ return -1;
+ }
+
+ fin = fopen(filename, "r");
+ if(NULL==fin)
+ {
+ perror("main(): problem opening file");
+ return -1;
+ }
+
+ fildes = fileno(fin);
+
+ ret = fstat(fildes, &stat_fd);
+ if(-1==ret)
+ {
+ perror("main(): problem invoking fstat() of file");
+ }
+
+ file_size = (long long)stat_fd.st_size;
+
+ if(verbose)
+ fprintf(stdout,
+ "file size: %lld (bytes)\n",
+ file_size);
+
+ buffer = (char*)calloc(file_size, sizeof(char));
+ if(NULL==buffer)
+ {
+ perror("main(): problem allocating buffer");
+ return -2;
+ }
+
+ //read the file into the buffer
+ itr = buffer;
+ //for(i=0;i<file_size;i++) //could also read until EOF
+ while(EOF!=(x=fgetc(fin)))
+ {
+ //x = fgetc(fin);
+ c = (unsigned char)x;
+ *itr = c;
+ itr++;
+ how_many_bytes_read++;
+ }
+ if(verbose)
+ fprintf(stdout,
+ "read %lld bytes\n",
+ how_many_bytes_read);
+
+ entropy_value = shannon_H(buffer, how_many_bytes_read);
+ fprintf(stdout,
+ "tokens: %d entropy: %f maxent: %f ratio: %f\n",
+ get_num_tokens(),
+ entropy_value,
+ get_max_entropy(),
+ get_entropy_ratio()
+ );
+
+ free(buffer);
+ buffer=NULL;
+ ret = fclose(fin);
+ if(EOF==ret)
+ perror("exiting main()");
+ fin=NULL;
+
+ return 0;
+}