AVCE00 library - Revision History
=================================


Current Version:
----------------


Version 2.0.1 (CVS):
--------------------

- Fixed GCC 4.1.x compile warnings related to use of char vs unsigned char
  (GDAL/OGR ticket http://trac.osgeo.org/gdal/ticket/2495)

- Fixed VC++ WIN32 build problems in GDAL/OGR environment
  (GDAL/OGR ticket http://trac.osgeo.org/gdal/ticket/2500)

- Detect compressed E00 input files and refuse to open them instead of
  crashing (bug 1928, GDAL/OGR ticket 2513)

- Avoid scanning the whole E00 input file in AVCE00ReadOpenE00() if the file
  does not start with an EXP line (GDAL/OGR ticket 1989)


Version 2.0.0 (2006-08-17):
---------------------------

- New functions to read E00 files directly as opposed to translating to
  binary coverage. Used in the implementation of E00 read support in OGR.
  Contributed by James E. Flemer <jflemer@alum.rpi.edu> (bug 1497)

  Adds the following new functions:

    AVCE00ReadE00Ptr AVCE00ReadOpenE00(const char *pszE00FileName);
    void             AVCE00ReadCloseE00(AVCE00ReadE00Ptr psRead);
    int              AVCE00ReadRewindE00(AVCE00ReadE00Ptr psRead);
    int              AVCE00ReadSeekE00(AVCE00ReadE00Ptr psRead,
                                       int nOffset, int nWhence);
    void            *AVCE00ReadNextObjectE00(AVCE00ReadE00Ptr psRead,
                                             int bContinue);

- Support for a new AVCCoverPC2 coverage type that is a hybrid between
  AVCCoverPC and AVCCoverV7 (bug 1491)

- Accept empty subclass names for TX6/TX7 sections (bug 1261)

- Applied patch to remove any embedded '\0' from data line in
  AVCE00GenTableRec()

- Support for reading standalone info tables (just tables, no coverage
  data) by pointing AVCE00ReadOpen() to the info directory (bug 1549).

- #include <unistd.h> to solve warning on 64 bit platforms (bug 1461)


Version 1.3.0 (2005-06-02):
---------------------------

- Applied Carl Anderson's patch to reduce the amount of stating while trying
  to discover filename "case" on Unix in AVCAdjustCaseSensitiveFilename.
  http://bugzilla.remotesensing.org/show_bug.cgi?id=314

- Fixed leak in AVCE00ReadOpen() when trying to open something that's
  not a coverage (bug513)

- Added AVCBinReadObject() to randomly read an object using the index file.
  Currently only works for Arcs, info records and polygons.  NFW

- Fixed up AVCBinReadObject() to work properly for PC Arc/Info style
  coverages.  Also fixed to use upper/lower case 'X' for index based on
  base file type. NFW  OGR Bug#493.

- avc_e00write.c: modified to use VSIMkdir().

- Use record size while reading ARC, PAL, CNT to skip junk bytes. (bug940)

- Fixed parsing of type 40 fields (modified for bug#599) to detect exponent
  format with negative exponents (bug#1272)

- Minor fixes in avc_e00gen.c to avoid compile warnings. (NFW)

- Fixed pointer aliasing ("type punning") problem re: gcc 3.3.x. (NFW)
  http://bugzilla.remotesensing.org/show_bug.cgi?id=592


Version 1.2.1 (2000-11-25):
---------------------------

- Remove trailing '/' in info directory path when creating the info dir
  since mkdir() on some UNIXes doesn't like it.

- Fixed a problem writing arc.dir on NT4 networked drives in an empty dir.
  (bugzilla bug#353)

- Fixed E00 parsing to properly handle PAL entries with 0 arcs which happen
  to contain a single "0 0 0" entry.

- Fixed E00 generation to correctly format 0-arc PAL records so that
  they have a single "0 0 0" (filler) arc record (bug#597)

- Fixed reading of type 40 fields from E00: when a type 40 field is not
  stored in exponent format then a decimal format may be used but the
  decimal position is shifted to the right in the E00 value.  So we have
  to shift the decimal point to the left (i.e. divide by 10) as we
  interpret the value (bug#599).  Really odd!

- Added a hack to remap type 40 fields bigger than 8 digits to double
  precision binary floats while generating E00 output (bug#599).
  In E00 format, type 40 fields bigger than 8 digits would lose some
  digits of precision and double precision floats can carry up to 18
  digits of precision.
  This hack is enabled using "-DAVC_MAP_TYPE40_TO_DOUBLE" in OPTFLAGS.

- Fixed problem with info/arc####.dat files coming from Windows that
  contained '\\' in the data file path.  Remap '\\' in path to '/' on Unix.
  This problem seems to be new with Arc8 on Windows.

- Fixed args to fseek() call in _AVCBinReadNextTableRec()... how come
  we never ran into this before???


Version 1.2.0 (2000-10-17):
---------------------------

- Added Japanese (multibyte characters) support.

- Made validation on new coverage name more flexible (used to accept only
  isalnum() chars and '_')

- Added a case to treat pal.adf files with nPrecision==1011 as double prec.
  Actually, any file with nPrecision > 1000 is now treated as double prec.

- Switch to MIT-style license

- Added PC Coverage write.

- Added optional -DAVC_IGNORE_RMDIR_ERROR to prevent generation of an error
  when AVCDeleteCoverage() fails to delete the actual coverage directory.

- Accept TXT files in AVCCoverWeird that use both PC or V7 TXT structure


Version 1.1.1 (2000-04-01):
---------------------------

- Support double-precision "weird" coverages... previous version assumed that
  "weird" coverages were always single precision.

- Fix problem with TX6/TXT object with strings > 80 chars.  String has to
  be split in 80 chars chunks in E00.

- Made lib more robust to detect corrupted or invalid files in a coverage
  directory by checking signature and skipping invalid files.


Version 1.1 (2000-01-10):
-------------------------

- PC Arc/Info Coverage support

- Support for reading "Weird" coverages (a kind of hybrid between PC and
  Unix V7 Coverages).


Version 1.0 (1999-12-04):
-------------------------

- Improved parsing of integer values in E00... big numbers in INFO table
  headers were sometimes merged and this resulted in unpredictable behavior.

Version 0.6 (1999-08-26):
-------------------------

- Added AVCE00DeleteCoverage()

- Fixed problem with handling of attribs of type 40 in E00 input/output

- Fixed VC++ warnings

- Fixed some memory leaks.

- Fixed a Windows-specific bug: the arc.dir was sometimes overwritten when
  several coverages were created by the same process... likely a buffering
  issue.

Version 0.5 (1999-06-10):
-------------------------

- Overwrite existing arc.dir entries when necessary while creating INFO
  tables.
  The problem was that when same coverage name was used twice with the
  same info directory... we ended up with 2 sets of tables with the
  same names.
  This happened if a user deleted a coverage directory using "rm".
  In this case, IMPORT71 reuses and overwrites the old table entry with
  the same name in the ARC.DIR... our lib now does the same.

- Created NMAKE makefile.vc for Windows

- Tested on Windows


Version 0.4 (1999-05-17):
-------------------------

- Added TXT/TX6/TX7 write support.

- Added RXP write support

- Fixed problem with double precision RPL sections: the second PAL
  termination line confused the parser.

- The write library now detects the E00's precision and generate
  a coverage using that precision by default when AVCE00WriteOpen()
  is called using AVC_DEFAULT_PREC.  (That's also the only valid
  option.)

- Added a check for maximum coverage name length (13 chars) when creating
  a new one.  Also force name to contain only alnum() and '_'.

- INFO TABLES: the name of the system attributes (COVER#/COVER-ID) are
               now changed to the new coverage name when creating a new
	       info table.

- Fixed problem parsing an E00 INFO table that contains 0 records
  (yes, they exist!)


Version 0.3 (1999-05-10):
-------------------------

- Added support to create coverages from E00 (alpha version).  Most file
  types are supported, but only single precision has been tested on Linux.
  There are still a number of known problems with the write support.

- Added proper support and tested with tables containing 16 bits integers
  (type 50, size=2)

- Fixed problem with 8 bytes floats in single-prec. tables, and 4 bytes
  floats in double-precision tables.

- Fixed the following problem:
   In some cases, the "number of records" field for a table in the
   arc.dir does not correspond to the real number of records
   in the data file.  In this kind of situation, the number of
   records returned by Arc/Info in an E00 file will be based
   on the real data file size, and not on the value from the arc.dir.

- Tested on a CPL_MSB system


Version 0.2 (1999-02-24):
-------------------------

- Added support for Annotations:
   - TXT
   - TX6
   - TX7 (Handled as TX6)

- Added support for coverages with regions (RXP/RPL sections)

- Tested with routes coverage

- Added support for "par.adf": Double precision coverages have their
  tolerances stored in a file named "par.adf" which is different from
  the "tol.adf" we find in single precision coverages...

- PRJ section: remove '\r' at end of lines when coverage generated on
  DOS systems is read on Unix.

- Support centroids (CNT) with more than one label attached to them.

- Do not skip INFO Tables with 0 records.  Since Arc/Info exports them,
  we should probably do it as well!

- Changed AVCE00ReadOpen() so that the coverage name does not absolutely
  have to be terminated by a "/".  Now, you can either pass the name of
  the coverage directory (with or without a '/' at the end), or the path
  to one of the files in the coverage directory.

- Added extra line after the end of PAL sections in double precision
  coverages:
        -1         0         0         0         0         0         0
 0.00000000000000E+00 0.00000000000000E+00
  Even if I consider this second line to be a glitch, I guess I have to
  mimic this behavior and add this extra line one as well!

- Modified "avcconv" command-line program to accept an output_filename
  as a its second argument.  Until now its output was always sent to stdout.

- Updated documentation, mainly the list of error codes.


Version 0.1 (1999-01-31):
-------------------------

First version, supports the most common file types, still several
know problems.


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$Id: HISTORY.TXT,v 1.32 2008/07/30 18:35:53 dmorissette Exp $
