loading gzipped dbd, db, subs

[Dirk Zimoch <dirk.zimoch@psi.ch>]

Hi all,

This is for those who have already wondered how to put the huge text 
files (*.dbd, *.db, *.subs etc) on a small (flash) disc or how to make 
loading those files via network faster.

With the attached patch (for R3.14.8.2, maybe works also on other 
versions), it is possible to read gzip'ed files with dbLoadDatabase, 
dbLoadRedords and dbLoadTemplate. (Of course not gzip'ed files still work.)

(A gzip'ing installation mechanism is not included! Write one or gzip 
manually.)

You need zlib for your target architecture in a location where the build 
mechanism can find it. Here is the zlib home page: http://www.zlib.net/

Add the following line to your <base>/configure/os/CONFIG.Common.<arch> 
file to activate the feature for an architecture:
HAVE_ZLIB = YES

Please report it this works/fails on different architectures.

Dirk
Index: src/dbStatic/Makefile
===================================================================
RCS file: /cvs/G/EPICS/base-3.14.8/src/dbStatic/Makefile,v
retrieving revision 1.1.1.1
diff -c -r1.1.1.1 Makefile
*** src/dbStatic/Makefile	10 Mar 2006 14:12:49 -0000	1.1.1.1
--- src/dbStatic/Makefile	18 Jul 2007 16:28:48 -0000
***************
*** 53,58 ****
--- 53,63 ----
  dbToMenuH_SRCS = dbToMenuH.c
  dbToRecordtypeH_SRCS = dbToRecordtypeH.c
  
+ ifeq ($(strip $(HAVE_ZLIB)),YES)
+ LIB_SYS_LIBS += z
+ CPPFLAGS+=-DHAVE_ZLIB
+ endif
+ 
  include $(TOP)/configure/RULES
  
  # Extra rule since dbLexRoutines.c is included in dbYacc.c
Index: src/dbStatic/dbLexRoutines.c
===================================================================
RCS file: /cvs/G/EPICS/base-3.14.8/src/dbStatic/dbLexRoutines.c,v
retrieving revision 1.1.1.1
diff -c -r1.1.1.1 dbLexRoutines.c
*** src/dbStatic/dbLexRoutines.c	10 Mar 2006 14:12:49 -0000	1.1.1.1
--- src/dbStatic/dbLexRoutines.c	18 Jul 2007 16:28:48 -0000
***************
*** 37,42 ****
--- 37,48 ----
  #include "dbStaticLib.h"
  #include "dbStaticPvt.h"
  
+ #if defined(HAVE_ZLIB)
+ #include "zlib.h"
+ #define fopen gzopen
+ #define fclose gzclose
+ #define fgets(buf,len,file) gzgets(file,buf,len)
+ #endif
  
  
  /*global declarations*/
Index: src/dbtools/Makefile
===================================================================
RCS file: /cvs/G/EPICS/base-3.14.8/src/dbtools/Makefile,v
retrieving revision 1.1.1.1
diff -c -r1.1.1.1 Makefile
*** src/dbtools/Makefile	10 Mar 2006 14:12:49 -0000	1.1.1.1
--- src/dbtools/Makefile	18 Jul 2007 16:28:48 -0000
***************
*** 32,37 ****
--- 32,42 ----
  OBJLIB_SRCS = $(LIBSRCS)
  endif
  
+ ifeq ($(strip $(HAVE_ZLIB)),YES)
+ LIB_SYS_LIBS += z
+ CPPFLAGS+=-DHAVE_ZLIB
+ endif
+ 
  include $(TOP)/configure/RULES
   
  #
Index: src/dbtools/dbLoadTemplate.y
===================================================================
RCS file: /cvs/G/EPICS/base-3.14.8/src/dbtools/dbLoadTemplate.y,v
retrieving revision 1.1.1.1
diff -c -r1.1.1.1 dbLoadTemplate.y
*** src/dbtools/dbLoadTemplate.y	10 Mar 2006 14:12:49 -0000	1.1.1.1
--- src/dbtools/dbLoadTemplate.y	18 Jul 2007 16:28:48 -0000
***************
*** 20,25 ****
--- 20,33 ----
  #define epicsExportSharedSymbols
  #include "dbLoadTemplate.h"
  
+ #if defined(HAVE_ZLIB)
+ #include "zlib.h"
+ #define fopen gzopen
+ #define fclose gzclose
+ #define read gzread
+ #define fileno(file) file
+ #endif
+ 
  static int line_num;
  static int yyerror();