From 3f73bfb3e09c407425245aa5f62477fd572328c9 Mon Sep 17 00:00:00 2001
From: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
Date: Sun, 18 Feb 2024 13:52:42 +0100
Subject: Make it possible to compile jffsX-utils without zlib

The jffsX-utils already have a CONFIG_JFFS2_ZLIB define, but it is
statically defined in a header and not used consistently. This patch
first replaces it with a "WITH_ZLIB" define, provided via automake,
to bring it in line with the already existing "WITH_LZO". Then, the
missing checks and typedefs are added in jffs2reader.c.

Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
---
 Makefile.am               | 2 ++
 jffsX-utils/compr.c       | 4 ++--
 jffsX-utils/compr.h       | 3 +--
 jffsX-utils/jffs2reader.c | 7 ++++++-
 4 files changed, 11 insertions(+), 5 deletions(-)

diff --git a/Makefile.am b/Makefile.am
index 299a5fb..06d154a 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -3,6 +3,8 @@ ACLOCAL_AMFLAGS = -I m4
 AM_CPPFLAGS = $(WARN_CFLAGS) -D_GNU_SOURCE -std=gnu99 -I$(top_srcdir)/include \
 		-include $(top_builddir)/include/config.h
 
+AM_CPPFLAGS += -DWITH_ZLIB
+
 if WITH_XATTR
 AM_CPPFLAGS += -DWITH_XATTR
 endif
diff --git a/jffsX-utils/compr.c b/jffsX-utils/compr.c
index 42d8a70..01176eb 100644
--- a/jffsX-utils/compr.c
+++ b/jffsX-utils/compr.c
@@ -511,7 +511,7 @@ reinsert:
 
 int jffs2_compressors_init(void)
 {
-#ifdef CONFIG_JFFS2_ZLIB
+#ifdef WITH_ZLIB
 	jffs2_zlib_init();
 #endif
 #ifdef CONFIG_JFFS2_RTIME
@@ -528,7 +528,7 @@ int jffs2_compressors_exit(void)
 #ifdef CONFIG_JFFS2_RTIME
 	jffs2_rtime_exit();
 #endif
-#ifdef CONFIG_JFFS2_ZLIB
+#ifdef WITH_ZLIB
 	jffs2_zlib_exit();
 #endif
 #ifdef WITH_LZO
diff --git a/jffsX-utils/compr.h b/jffsX-utils/compr.h
index 0806f4d..f1f5975 100644
--- a/jffsX-utils/compr.h
+++ b/jffsX-utils/compr.h
@@ -16,7 +16,6 @@
 #include <stdint.h>
 #include "linux/jffs2.h"
 
-#define CONFIG_JFFS2_ZLIB
 #define CONFIG_JFFS2_RTIME
 
 #define JFFS2_RUBINMIPS_PRIORITY 10
@@ -102,7 +101,7 @@ char *jffs2_stats(void);
 /* Compressor modules */
 
 /* These functions will be called by jffs2_compressors_init/exit */
-#ifdef CONFIG_JFFS2_ZLIB
+#ifdef WITH_ZLIB
 int jffs2_zlib_init(void);
 void jffs2_zlib_exit(void);
 #endif
diff --git a/jffsX-utils/jffs2reader.c b/jffsX-utils/jffs2reader.c
index 33c5577..87a2167 100644
--- a/jffsX-utils/jffs2reader.c
+++ b/jffsX-utils/jffs2reader.c
@@ -75,7 +75,11 @@ BUGS:
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <dirent.h>
+#ifdef WITH_ZLIB
 #include <zlib.h>
+#else
+typedef unsigned long uLongf;
+#endif
 
 #include "mtd/jffs2-user.h"
 #include "common.h"
@@ -132,12 +136,13 @@ static void putblock(char *b, size_t bsize, size_t * rsize,
 		bzero(b + *rsize, je32_to_cpu(n->isize) - *rsize);
 
 	switch (n->compr) {
+#ifdef WITH_ZLIB
 		case JFFS2_COMPR_ZLIB:
 			uncompress((Bytef *) b + je32_to_cpu(n->offset), &dlen,
 					(Bytef *) ((char *) n) + sizeof(struct jffs2_raw_inode),
 					(uLongf) je32_to_cpu(n->csize));
 			break;
-
+#endif
 		case JFFS2_COMPR_NONE:
 			memcpy(b + je32_to_cpu(n->offset),
 					((char *) n) + sizeof(struct jffs2_raw_inode), dlen);
-- 
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