Mail Archives: djgpp/2014/05/11/19:15:45.2
This is a port of library JBIG 2.1 to MSDOS/DJGPP.
The JBIG-KIT lossless image compression library implements a highly effective
data compression algorithm for bi-level high-resolution images such as fax
pages or scanned documents. This release adds a separate lightweight "T.85"
version of the encoder and decoder library. This new T.85 library is optimized
for embedded low-memory applications, such as printers and fax machines.
It implements only the subset of the JBIG standard that is required by the
ITU-T T.85 fax profile, namely only a single bit plane and no differential
layers and some other restrictions.
DJGPP specific changes.
=======================
The code of the utility programs has been changed in such a way that their
stdin and stdout is always switched into binary mode. This is necessary to
be able to process data that is piped to stdin from other programs or piped
from stdout to other programs. It is clear that you will no longer be able
to interrupt one of the utility programs by pressing Cntl-C, but this will
make the test suite pass flawlessly and will make work the programs if used
in a pipe. If this program behavior is not wanted, you will have to
recompile those programs with the macro SET_STDIN_STDOUT_IN_BINARY_MODE set
to 0 in the following four files:
/pbmtools/jbgtopbm.c, /pbmtools/jbgtopbm85.c, /pbmtools/pbmtojbg.c and
/pbmtools/pbmtojbg85.c. In that case you will get binaries that can be
interrupted from the console but that will not be able to read or write
files from stdin and stdout because they operate in text mode. Of course,
the programs will always read and write in binary mode. The code of the
libraries itself have not been modified at all.
The package does not need any configuration. To compile the products simple
use the provided makefiles. As usual the diffs file is stored in /djgpp.
To avoid file name clashes on SFN systems I have renamed the programs
jbgtopbm85.exe and pbmtojbg85.exe to 85jbgtopbm.exe and 85pbmtojbg.exe.
The library libjbig85.a will have the truncated file name libjbig8.a if
extracted on SFN systems. I have preferred not to change the library name
in the hope that scripts and makefiles that relay on the original name
continue working on SFN systems without the need of modifications.
Please read the docs to become familiar with the products.
This is an verbatim extract of the CHANGES file:
-------------------------------------------------------------------------------
Changes in version 2.1 (2014-04-08)
This is a security-critical bug-fix release that remains API and ABI
backwards compatible to version 2.0. Users who process BIE data from
untrusted sources should upgrade.
- fixed a buffer-overflow vulnerability in the jbig.c decoder,
reported by Florian Weimer (Red Hat): CVE-2013-6369
- fixed ability of corrupted input data to force jbig85.c decoder
into an end-less loop
- fixed a bug in the processing of private deterministic-prediction
tables (DPPRIV=1) in jbig.c decoder
- fixed integer-type mismatches in printf arguments on 64-bit systems
- fuzz-testing script added
-------------------------------------------------------------------------------
The port has been compiled using stock djdev203 (patchlevel 2) and consists
of the usual three packages that can be downloaded from ftp.delorie.com and
mirrors as (time stamp 2014-05-11):
library JBIG 2.1 headers, libs, programs and man format documentation:
ftp://ftp.delorie.com/pub/djgpp/current/v2tk/jbig21b.zip
library JBIG 2.1 source:
ftp://ftp.delorie.com/pub/djgpp/current/v2tk/jbig21s.zip
The binaries have been produced a second time using the stock version of
djdev204 beta library. This package is available at ftp.delorie.com and
mirrors as (time stamp 2014-05-11):
library JBIG 2.1 headers, libs, programs and man format documentation:
ftp://ftp.delorie.com/pub/djgpp/beta/v2tk/jbig21b.zip
Send library JBIG specific bug reports to <mgk25 AT cl DOT cam DOT ac DOT uk>.
Send suggestions and bug reports concerning the DJGPP port to
comp.os.msdos.djgpp or <djgpp AT delorie DOT com>.
Enjoy.
Guerrero, Juan Manuel <juan DOT guerrero AT gmx DOT de>
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