XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX  BZT  XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

    Small BZ-toggler with user-friendly menu, compressing also directories
                          For the HP49, March 2001

BZT is the smallest available complete compressing-tool. As comfortable as the
best BZ-tools, and it is fast. Avoid other compressors (for string integrity).
After compressing a stack object, a menu for handling the resulting BZ-string
appears with the following options:

UBZi Appends BZT to the BZ-string for decompression. For internal use only, 
     i.e., for your own HP49 which knows the global variable BZT. 

UBZe Appends a small BZ-decompessor (only 31 bytes) for external use, e.g., 
     if a compressed program is sent to hpcalc.org or to somebody who may not 
     have BZ-tools. Each HP49 executes the decompressing code.

+EVL Appends the EVAL-command to a program. E.g., if applied to the program 
     <<"BZ..." BZT >> one gets <<"BZ..." BZT EVAL>> (self-evaluation after 
     decompression). Similarly, EVAL may be appended to a program generated 
     by UBZe. Avoid to apply +EVL twice. This may lateron yield an error. 

BZT  Just a menu access to BZT. Used, e.g., to decompress and compress again.
     The name BZT should be assigned to a key.           

If applied on a BZ-string, BZT decompresses it very fast. Note that for large
objects (grobs and programs of more then 500 bytes, say) the compression rate
strongly depends on how coloured your grob or program is. The less coloured 
the higher the compression rate. For a program "highly coloured" means using 
many different commands or words and leaving not much room for repetition. 

BZT also compresses a whole directory together with all its subdirectories and 
hidden files, whenever BZT gets the name of the directory as an argument. BZT 
leaves a single file in the directory, with the directories' name. A key-press 
immediately restores the original. BZT must not be renamed and should stay in
HOME, maybe hidden, but assigned to a key. Still better, load OT49. It has it
as an option. REMEMBER: a directory with a single equally named file indicates 
that the latter holds the packed directory. 

BZ is due to Mika Heiskanen, the decompressor essentially to Jurien N.E. Bos.
BZT is small since the compressor decompresses itself before going to work.
-----------------------------------------------------------------------------
 Wolfgang Rautenberg  raut@math.fu-berlin.de  www.math.fu-berlin.de/usr/raut