From bebbd8c9baaa7a2da5ac9ab484f54ce3115982d5 Mon Sep 17 00:00:00 2001
From: Denis Vlasenko <vda.linux@googlemail.com>
Date: Fri, 9 Mar 2007 20:49:55 +0000
Subject: [PATCH] bbunzip: size optimization: ~90 bytes

---
 archival/Kbuild    |  8 ++++----
 archival/bbunzip.c | 35 +++++++++++++++++------------------
 2 files changed, 21 insertions(+), 22 deletions(-)

diff --git a/archival/Kbuild b/archival/Kbuild
index 50b90fa93..011feee5f 100644
--- a/archival/Kbuild
+++ b/archival/Kbuild
@@ -8,15 +8,15 @@ libs-y				+= libunarchive/
 
 lib-y:=
 lib-$(CONFIG_AR)		+= ar.o
-lib-$(CONFIG_BUNZIP2)		+= bbunzip.o ### bunzip2.o
-lib-$(CONFIG_UNLZMA)		+= bbunzip.o ### unlzma.o
+lib-$(CONFIG_BUNZIP2)		+= bbunzip.o
+lib-$(CONFIG_UNLZMA)		+= bbunzip.o
 lib-$(CONFIG_CPIO)		+= cpio.o
 lib-$(CONFIG_DPKG)		+= dpkg.o
 lib-$(CONFIG_DPKG_DEB)		+= dpkg_deb.o
-lib-$(CONFIG_GUNZIP)		+= bbunzip.o ### gunzip.o
+lib-$(CONFIG_GUNZIP)		+= bbunzip.o
 lib-$(CONFIG_GZIP)		+= gzip.o
 lib-$(CONFIG_RPM2CPIO)		+= rpm2cpio.o
 lib-$(CONFIG_RPM)		+= rpm.o
 lib-$(CONFIG_TAR)		+= tar.o
-lib-$(CONFIG_UNCOMPRESS)	+= bbunzip.o ### uncompress.o
+lib-$(CONFIG_UNCOMPRESS)	+= bbunzip.o
 lib-$(CONFIG_UNZIP)		+= unzip.o
diff --git a/archival/bbunzip.c b/archival/bbunzip.c
index 3dff946a1..b922fd373 100644
--- a/archival/bbunzip.c
+++ b/archival/bbunzip.c
@@ -127,13 +127,11 @@ int unpack(char **argv,
 	return exitcode;
 }
 
-#if ENABLE_BUNZIP2
-
 static
-char* make_new_name_bunzip2(char *filename)
+char* make_new_name_generic(char *filename, const char *expected_ext)
 {
 	char *extension = strrchr(filename, '.');
-	if (!extension || strcmp(extension, ".bz2") != 0) {
+	if (!extension || strcmp(extension + 1, expected_ext) != 0) {
 		/* Mimic GNU gunzip - "real" bunzip2 tries to */
 		/* unpack file anyway, to file.out */
 		return NULL;
@@ -142,6 +140,14 @@ char* make_new_name_bunzip2(char *filename)
 	return filename;
 }
 
+#if ENABLE_BUNZIP2
+
+static
+char* make_new_name_bunzip2(char *filename)
+{
+	return make_new_name_generic(filename, "bz2");
+}
+
 static
 USE_DESKTOP(long long) int unpack_bunzip2(void)
 {
@@ -200,13 +206,14 @@ char* make_new_name_gunzip(char *filename)
 	if (!extension)
 		return NULL;
 
-	if (strcmp(extension, ".gz") == 0
+	extension++;
+	if (strcmp(extension, "tgz" + 1) == 0
 #ifdef CONFIG_FEATURE_GUNZIP_UNCOMPRESS
-	 || strcmp(extension, ".Z") == 0
+	 || strcmp(extension, "Z") == 0
 #endif
 	) {
-		*extension = '\0';
-	} else if(strcmp(extension, ".tgz") == 0) {
+		extension[-1] = '\0';
+	} else if(strcmp(extension, "tgz") == 0) {
 		filename = xstrdup(filename);
 		extension = strrchr(filename, '.');
 		extension[2] = 'a';
@@ -275,11 +282,7 @@ int gunzip_main(int argc, char **argv)
 static
 char* make_new_name_unlzma(char *filename)
 {
-	char *extension = strrchr(filename, '.');
-	if (!extension || strcmp(extension, ".lzma") != 0)
-		return NULL;
-	*extension = '\0';
-	return filename;
+	return make_new_name_generic(filename, "lzma");
 }
 
 static
@@ -315,11 +318,7 @@ int unlzma_main(int argc, char **argv)
 static
 char* make_new_name_uncompress(char *filename)
 {
-	char *extension = strrchr(filename, '.');
-	if (!extension || strcmp(extension, ".Z") != 0)
-		return NULL;
-	*extension = '\0';
-	return filename;
+	return make_new_name_generic(filename, "Z");
 }
 
 static
-- 
2.25.1