zlib/as400
Mark Adler afe7cf78d5 Enable dictionary setting in middle of stream, and keeping the dictionary.
This patch adds the deflateResetKeep() function to retain the sliding
window for the next deflate operation, and fixes an inflateResetKeep()
problem that came from inflate() not updating the window when the
stream completed.  This enables constructing and decompressing a series
of concatenated deflate streams where each can depend on the history of
uncompressed data that precedes it.

This generalizes deflateSetDictionary() and inflateSetDictionary() to
permit setting the dictionary in the middle of a stream for raw deflate
and inflate.  This in combination with the Keep functions enables a
scheme for updating files block by block with the transmission of
compressed data, where blocks are sent with deflateResetKeep() to
retain history for better compression, and deflateSetDictionary() is
used for blocks already present at the receiver to skip compression but
insert that data in the history, again for better compression.  The
corresponding inflate calls are done on the receiver side.
2011-12-08 00:13:52 -08:00
..
bndsrc Enable dictionary setting in middle of stream, and keeping the dictionary. 2011-12-08 00:13:52 -08:00
compile.clp Change version numbers to 1.2.5.2 and release dates 2011-09-11 11:16:41 -07:00
readme.txt Change version numbers to 1.2.5.2 and release dates 2011-09-11 11:16:41 -07:00
zlib.inc Enable dictionary setting in middle of stream, and keeping the dictionary. 2011-12-08 00:13:52 -08:00

        ZLIB version 1.2.5.2 for AS400 installation instructions

I) From an AS400 *SAVF file:

1)      Unpacking archive to an AS400 save file

On the AS400:

_       Create the ZLIB AS400 library:

        CRTLIB LIB(ZLIB) TYPE(PROD) TEXT('ZLIB compression API library')

_       Create a work save file, for example:

                CRTSAVF FILE(ZLIB/ZLIBSAVF)

On a PC connected to the target AS400:

_       Unpack the save file image to a PC file "ZLIBSAVF"
_       Upload this file into the save file on the AS400, for example
                using ftp in BINARY mode.


2)      Populating the ZLIB AS400 source library

On the AS400:

_       Extract the saved objects into the ZLIB AS400 library using:

RSTOBJ OBJ(*ALL) SAVLIB(ZLIB) DEV(*SAVF) SAVF(ZLIB/ZLIBSAVF) RSTLIB(ZLIB)


3)      Customize installation:

_       Edit CL member ZLIB/TOOLS(COMPILE) and change parameters if needed,
                according to the comments.

_       Compile this member with:

        CRTCLPGM PGM(ZLIB/COMPILE) SRCFILE(ZLIB/TOOLS) SRCMBR(COMPILE)


4)      Compile and generate the service program:

_       This can now be done by executing:

        CALL PGM(ZLIB/COMPILE)



II) From the original source distribution:

1)      On the AS400, create the source library:

        CRTLIB LIB(ZLIB) TYPE(PROD) TEXT('ZLIB compression API library')

2)      Create the source files:

        CRTSRCPF FILE(ZLIB/SOURCES) RCDLEN(112) TEXT('ZLIB library modules')
        CRTSRCPF FILE(ZLIB/H)       RCDLEN(112) TEXT('ZLIB library includes')
        CRTSRCPF FILE(ZLIB/TOOLS)   RCDLEN(112) TEXT('ZLIB library control utilities')

3)      From the machine hosting the distribution files, upload them (with
                FTP in text mode, for example) according to the following table:

    Original    AS400   AS400    AS400 AS400
    file        file    member   type  description
                SOURCES                Original ZLIB C subprogram sources
    adler32.c           ADLER32  C     ZLIB - Compute the Adler-32 checksum of a dta strm
    compress.c          COMPRESS C     ZLIB - Compress a memory buffer
    crc32.c             CRC32    C     ZLIB - Compute the CRC-32 of a data stream
    deflate.c           DEFLATE  C     ZLIB - Compress data using the deflation algorithm
    gzclose.c           GZCLOSE  C     ZLIB - Close .gz files
    gzlib.c             GZLIB    C     ZLIB - Miscellaneous .gz files IO support
    gzread.c            GZREAD   C     ZLIB - Read .gz files
    gzwrite.c           GZWRITE  C     ZLIB - Write .gz files
    infback.c           INFBACK  C     ZLIB - Inflate using a callback interface
    inffast.c           INFFAST  C     ZLIB - Fast proc. literals & length/distance pairs
    inflate.c           INFLATE  C     ZLIB - Interface to inflate modules
    inftrees.c          INFTREES C     ZLIB - Generate Huffman trees for efficient decode
    trees.c             TREES    C     ZLIB - Output deflated data using Huffman coding
    uncompr.c           UNCOMPR  C     ZLIB - Decompress a memory buffer
    zutil.c             ZUTIL    C     ZLIB - Target dependent utility functions
                H                      Original ZLIB C and ILE/RPG include files
    crc32.h             CRC32    C     ZLIB - CRC32 tables
    deflate.h           DEFLATE  C     ZLIB - Internal compression state
    gzguts.h            GZGUTS   C     ZLIB - Definitions for the gzclose module
    inffast.h           INFFAST  C     ZLIB - Header to use inffast.c
    inffixed.h          INFFIXED C     ZLIB - Table for decoding fixed codes
    inflate.h           INFLATE  C     ZLIB - Internal inflate state definitions
    inftrees.h          INFTREES C     ZLIB - Header to use inftrees.c
    trees.h             TREES    C     ZLIB - Created automatically with -DGEN_TREES_H
    zconf.h             ZCONF    C     ZLIB - Compression library configuration
    zlib.h              ZLIB     C     ZLIB - Compression library C user interface
    as400/zlib.inc      ZLIB.INC RPGLE ZLIB - Compression library ILE RPG user interface
    zutil.h             ZUTIL    C     ZLIB - Internal interface and configuration
                TOOLS                  Building source software & AS/400 README
    as400/bndsrc        BNDSRC         Entry point exportation list
    as400/compile.clp   COMPILE  CLP   Compile sources & generate service program
    as400/readme.txt    README   TXT   Installation instructions

4)      Continue as in I)3).




Notes:  For AS400 ILE RPG programmers, a /copy member defining the ZLIB
                API prototypes for ILE RPG can be found in ZLIB/H(ZLIB.INC).
                Please read comments in this member for more information.

        Remember that most foreign textual data are ASCII coded: this
                implementation does not handle conversion from/to ASCII, so
                text data code conversions must be done explicitely.

        Mainly for the reason above, always open zipped files in binary mode.