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.PNG support (Miscellaneous)

posted by rr Homepage E-mail, Berlin, Germany, 01.09.2007, 20:44

> You tested zlib with OW 1.7-RC2, no? Did you only compile to 32-bit or did
> you try with 16-bit DOS too? (Any .PNG viewer needs Inflate support).
Yes, I only tried 32-bit DOS, but later Carl Young said: "There is a ZLIB in the OW tree - in \contrib\zlib." see below

> Actually, I don't know if a 16-bit DOS .PNG viewer even exists (anyone??).
I have no idea, but I'm no authority, because I don't use .PNG very often.

This is "contrib\zlib\msdos\Makefile.w16":

# Makefile for zlib
# Open Watcom C/C++ 1.3 or later. Earlier versions may also work.
# Last updated: 12-Jun-2005

# To use, do "wmake -f makefile.w16"
# To compile in small model, set below: MODEL=s

# If you wish to reduce the memory requirements (default 256K for big
# objects plus a few K), you can add to the LOC macro below:
#   -DMAX_MEM_LEVEL=7 -DMAX_WBITS=14
# See zconf.h for details about the memory requirements.

#    Optional nonstandard preprocessor flags (e.g. -DMAX_MEM_LEVEL=7)
#    should be added to the environment via "set LOCAL_ZLIB=-DFOO" or added
#    to the declaration of LOC here:
LOC = $(LOCAL_ZLIB)

# Type for CPU required: 0: 8086, 1: 80186, 2: 80286, 3: 80386, etc.
CPU_TYP = 0

# Memory model: one of S, M, C, L (small, medium, compact, large)
MODEL=l

# Target OS: one of dos, os2. Defaults to host OS. Uncomment to override.
#TARGET_OS=dos
#CC_TARGET=-bt=$(TARGET_OS)
#LD_TARGET=sys $(TARGET_OS)

CC=wcc
CFLAGS=-zq -m$(MODEL) -$(CPU_TYP) -wx -oaxt $(LOC) $(CC_TARGET)
LIB_CFLAGS=-zl $(CFLAGS)

LD=wlink
LDFLAGS= $(LD_TARGET) option quiet, map, stack=0x1500

# variables
ZLIB_LIB = zlib_$(MODEL).lib

OBJ1 = adler32.obj compress.obj crc32.obj deflate.obj gzio.obj infback.obj
OBJ2 = inffast.obj inflate.obj inftrees.obj trees.obj uncompr.obj zutil.obj


# targets
all:  $(ZLIB_LIB) example.exe minigzip.exe

.c.obj:
        $(CC) $(LIB_CFLAGS) $*.c

adler32.obj: adler32.c zlib.h zconf.h

compress.obj: compress.c zlib.h zconf.h

crc32.obj: crc32.c zlib.h zconf.h crc32.h

deflate.obj: deflate.c deflate.h zutil.h zlib.h zconf.h

gzio.obj: gzio.c zutil.h zlib.h zconf.h

infback.obj: infback.c zutil.h zlib.h zconf.h inftrees.h inflate.h &
 inffast.h inffixed.h

inffast.obj: inffast.c zutil.h zlib.h zconf.h inftrees.h inflate.h &
 inffast.h

inflate.obj: inflate.c zutil.h zlib.h zconf.h inftrees.h inflate.h &
 inffast.h inffixed.h

inftrees.obj: inftrees.c zutil.h zlib.h zconf.h inftrees.h

trees.obj: trees.c zutil.h zlib.h zconf.h deflate.h trees.h

uncompr.obj: uncompr.c zlib.h zconf.h

zutil.obj: zutil.c zutil.h zlib.h zconf.h

example.obj: example.c zlib.h zconf.h
        $(CC) $(CFLAGS) $*.c

minigzip.obj: minigzip.c zlib.h zconf.h
        $(CC) $(CFLAGS) $*.c


# the command line is cut to fit in the MS-DOS 128 byte limit:
$(ZLIB_LIB): $(OBJ1) $(OBJ2)
        if exist $(ZLIB_LIB) del $(ZLIB_LIB)
        wlib -q $(ZLIB_LIB) $(OBJ1)
        wlib -q $(ZLIB_LIB) $(OBJ2)

example.exe: example.obj $(ZLIB_LIB)
        $(LD) $(LDFLAGS) file example.obj lib $(ZLIB_LIB)

minigzip.exe: minigzip.obj $(ZLIB_LIB)
        $(LD) $(LDFLAGS) file minigzip.obj lib $(ZLIB_LIB)

test: example.exe minigzip.exe .symbolic
        example
        echo hello world | minigzip | minigzip -d

clean: .symbolic
        -del *.obj
        -del *.lib
        -del *.exe
        -del *.map
        -del zlib_*.bak
        -del foo.gz

---
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