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From: Doug Kaufman <dkaufman AT rahul DOT net>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Problem with UNRAR
Date: Wed, 5 Jan 2005 20:45:48 +0000 (UTC)
Organization: a2i network
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Dian Yin <yindian AT mail DOT ustc DOT edu DOT cn> writes:

>Recently, I downloaded source code of UNRAR for linux, and tried to
>compile it under DOS using DJGPP. I extracted the package and run "make".
>However, the UNRAR.EXE I got seems to be incorrect, as it cannot recognize
>any RAR archive. Every time it says: xxxx.rar is not RAR archive.

The last unrar that I compiled for DJGPP was unrarsrc-3.4.2 (latest is
3.4.3) from ftp://ftp.rarsoft.com/rar. This has not been extensively
tested by me, but seems to work. There is no general makefile that comes
with the archive, so I don't see how you just did "make". Here is the
patch file that I used, which also generates a makefile. Don't be
surprised if additional changes are needed, since this doesn't seem to
be maintained for DJGPP and I have only used it a few times.
                               Doug

--- filefn.cpp.orig	2004-08-03 04:35:44.000000000 -0800
+++ filefn.cpp	2005-01-05 12:41:26.000000000 -0800
@@ -195,6 +195,20 @@
   return(1457664);
 #elif defined(_EMX)
   int Drive=(!isalpha(Name[0]) || Name[1]!=':') ? 0:toupper(Name[0])-'A'+1;
+#ifdef __DJGPP__
+  {
+    __dpmi_regs regs;
+    memset(&regs,0,sizeof(regs));
+    regs.h.ah=0x36;
+    regs.h.dl=Drive;
+    __dpmi_int (0x21, &regs);
+    if (regs.x.ax==0xffff)
+      return(1457664);
+    Int64 FreeSize=regs.x.ax*regs.x.cx;
+    FreeSize=FreeSize*regs.x.bx;
+    return(FreeSize);
+  }
+#else
   if (_osmode == OS2_MODE)
   {
     FSALLOCATE fsa;
@@ -217,6 +231,7 @@
     FreeSize=FreeSize*outregs.x.bx;
     return(FreeSize);
   }
+#endif /* __DJGPP__ */
 #else
   #define DISABLEAUTODETECT
   return(1457664);
--- makefile.dj.orig	2005-01-05 12:13:02.000000000 -0800
+++ makefile.dj	2005-01-05 12:14:54.000000000 -0800
@@ -0,0 +1,45 @@
+#
+# Makefile for DJGPP - unrar
+#
+# Note: you have to 'make clean' before you can build
+#	the sfx module
+#
+
+# DJGPP using GCC
+CXX=gpp
+CXXFLAGS=-O2 -W -Wall
+DEFINES=
+
+
+##########################
+
+COMPILE=$(CXX) $(CXXFLAGS) $(DEFINES)
+LINK=$(CXX)
+
+UNRAR_OBJ=filestr.o recvol.o rs.o scantree.o
+
+OBJECTS=rar.o strlist.o strfn.o pathfn.o int64.o savepos.o global.o file.o filefn.o filcreat.o \
+	archive.o arcread.o unicode.o system.o isnt.o crypt.o crc.o rawread.o encname.o \
+	resource.o match.o timefn.o rdwrfn.o consio.o options.o ulinks.o errhnd.o rarvm.o \
+	rijndael.o getbits.o sha1.o extinfo.o extract.o volume.o list.o find.o unpack.o cmddata.o
+
+.cpp.o:
+	$(COMPILE) -D$(WHAT) -c $<
+
+all:	unrar
+
+clean:
+	@rm -f *.o *.bak *~
+
+unrar:	WHAT=UNRAR
+unrar:	$(OBJECTS) $(UNRAR_OBJ)
+	@rm -f makeunrar
+	$(LINK) -o unrar $(LDFLAGS) $(OBJECTS) $(UNRAR_OBJ) $(LIBS)	
+	@strip unrar
+
+sfx:	WHAT=SFX_MODULE
+sfx:	$(OBJECTS)
+	@rm -f default.sfx
+	$(LINK) -o default.sfx $(LDFLAGS) $(OBJECTS) -DSFX_MODULE 
+	strip default.sfx
+
--- os.hpp.orig	2004-08-03 04:35:46.000000000 -0800
+++ os.hpp	2005-01-05 12:01:26.000000000 -0800
@@ -69,6 +69,8 @@
   #include <errno.h>
   #ifdef _DJGPP
     #include <utime.h>
+    #include <dpmi.h>
+    #include <io.h>
   #else
     #include <os2.h>
     #include <sys/utime.h>
--- pathfn.cpp.orig	2004-08-03 04:35:46.000000000 -0800
+++ pathfn.cpp	2005-01-05 11:38:16.000000000 -0800
@@ -294,6 +294,7 @@
     strcpy(RARFileName,Path);
   if (Number!=0)
     return(false);
+#ifndef __DJGPP__
   if (_osmode==OS2_MODE)
   {
     PTIB ptib;
@@ -302,6 +303,7 @@
     DosQueryModuleName(ppib->pib_hmte,NM,Path);
   }
   else
+#endif /* __DJGPP__ */
     strcpy(Path,RARFileName);
   RemoveNameFromPath(Path);
   return(true);
-- 
Doug Kaufman
Internet: dkaufman AT rahul DOT net