Support old-style compress (.Z) files via libbb / unzip( ) calls

(configurable) - When enabled an applet "uncompress" is also made
available (oddname to gunzip)

archival/libunarchive/decompress_unzip.c

@@ -65,8 +65,13 @@ static char *license_msg[] = {
 #include <signal.h>
 #include <stdlib.h>
 #include <string.h>
+#include "config.h"
 #include "libbb.h"
 
+#ifdef CONFIG_FEATURE_UNCOMPRESS
+int uncompress ( FILE *in, FILE *out );
+#endif
+
 static FILE *in_file, *out_file;
 
 /* these are freed by gz_close */
@@ -911,6 +916,7 @@ extern int unzip(FILE *l_in_file, FILE *l_out_file)
 	unsigned char flags;	/* compression flags */
 	typedef void (*sig_type) (int);
 	unsigned short i;
+	unsigned char magic [2];
 
 	if (signal(SIGINT, SIG_IGN) != SIG_IGN) {
 		(void) signal(SIGINT, (sig_type) abort_gzip);
@@ -926,8 +932,18 @@ extern int unzip(FILE *l_in_file, FILE *l_out_file)
 	}
 #endif
 
+	magic [0] = fgetc(l_in_file);
+	magic [1] = fgetc(l_in_file);
+	
+#ifdef CONFIG_FEATURE_UNCOMPRESS
+	/* Magic header for compress files, 1F 9d = \037\235 */
+	if (( magic [0] == 0x1F ) && ( magic [1] == 0x9d)) {
+		return uncompress ( l_in_file, l_out_file );
+	}
+#endif
+
 	/* Magic header for gzip files, 1F 8B = \037\213 */
-	if ((fgetc(l_in_file) != 0x1F) || (fgetc(l_in_file) != 0x8b)) {
+	if (( magic [0] != 0x1F ) || ( magic [1] != 0x8b)) {
 		error_msg("Invalid gzip magic");
 		return EXIT_FAILURE;
 	}

archival/libunarchive/unzip.c

@@ -65,8 +65,13 @@ static char *license_msg[] = {
 #include <signal.h>
 #include <stdlib.h>
 #include <string.h>
+#include "config.h"
 #include "libbb.h"
 
+#ifdef CONFIG_FEATURE_UNCOMPRESS
+int uncompress ( FILE *in, FILE *out );
+#endif
+
 static FILE *in_file, *out_file;
 
 /* these are freed by gz_close */
@@ -911,6 +916,7 @@ extern int unzip(FILE *l_in_file, FILE *l_out_file)
 	unsigned char flags;	/* compression flags */
 	typedef void (*sig_type) (int);
 	unsigned short i;
+	unsigned char magic [2];
 
 	if (signal(SIGINT, SIG_IGN) != SIG_IGN) {
 		(void) signal(SIGINT, (sig_type) abort_gzip);
@@ -926,8 +932,18 @@ extern int unzip(FILE *l_in_file, FILE *l_out_file)
 	}
 #endif
 
+	magic [0] = fgetc(l_in_file);
+	magic [1] = fgetc(l_in_file);
+	
+#ifdef CONFIG_FEATURE_UNCOMPRESS
+	/* Magic header for compress files, 1F 9d = \037\235 */
+	if (( magic [0] == 0x1F ) && ( magic [1] == 0x9d)) {
+		return uncompress ( l_in_file, l_out_file );
+	}
+#endif
+
 	/* Magic header for gzip files, 1F 8B = \037\213 */
-	if ((fgetc(l_in_file) != 0x1F) || (fgetc(l_in_file) != 0x8b)) {
+	if (( magic [0] != 0x1F ) || ( magic [1] != 0x8b)) {
 		error_msg("Invalid gzip magic");
 		return EXIT_FAILURE;
 	}

include/applets.h

@@ -467,6 +467,11 @@
 #ifdef CONFIG_UNAME
 	APPLET(uname, uname_main, _BB_DIR_BIN)
 #endif
+#ifdef CONFIG_GUNZIP	
+# ifdef CONFIG_FEATURE_UNCOMPRESS
+	APPLET_ODDNAME("uncompress", gunzip_main, _BB_DIR_BIN, gunzip)
+# endif
+#endif
 #ifdef CONFIG_UNIQ
 	APPLET(uniq, uniq_main, _BB_DIR_USR_BIN)
 #endif

libbb/Makefile.in

@@ -34,7 +34,7 @@ LIBBB_SRC:= \
 	my_getpwuid.c parse_mode.c parse_number.c perror_msg.c perror_msg_and_die.c \
 	print_file.c process_escape_sequence.c read_package_field.c recursive_action.c \
 	safe_read.c safe_strncpy.c syscalls.c syslog_msg_with_name.c time_string.c \
-	trim.c unzip.c vdprintf.c verror_msg.c vperror_msg.c wfopen.c xfuncs.c \
+	trim.c unzip.c uncompress.c vdprintf.c verror_msg.c vperror_msg.c wfopen.c xfuncs.c \
 	xgetcwd.c xreadlink.c xregcomp.c interface.c remove_file.c last_char_is.c \
 	copyfd.c vherror_msg.c herror_msg.c herror_msg_and_die.c xgethostbyname.c \
 	dirname.c make_directory.c create_icmp_socket.c u_signal_names.c arith.c \

libbb/unzip.c

@@ -65,8 +65,13 @@ static char *license_msg[] = {
 #include <signal.h>
 #include <stdlib.h>
 #include <string.h>
+#include "config.h"
 #include "libbb.h"
 
+#ifdef CONFIG_FEATURE_UNCOMPRESS
+int uncompress ( FILE *in, FILE *out );
+#endif
+
 static FILE *in_file, *out_file;
 
 /* these are freed by gz_close */
@@ -911,6 +916,7 @@ extern int unzip(FILE *l_in_file, FILE *l_out_file)
 	unsigned char flags;	/* compression flags */
 	typedef void (*sig_type) (int);
 	unsigned short i;
+	unsigned char magic [2];
 
 	if (signal(SIGINT, SIG_IGN) != SIG_IGN) {
 		(void) signal(SIGINT, (sig_type) abort_gzip);
@@ -926,8 +932,18 @@ extern int unzip(FILE *l_in_file, FILE *l_out_file)
 	}
 #endif
 
+	magic [0] = fgetc(l_in_file);
+	magic [1] = fgetc(l_in_file);
+	
+#ifdef CONFIG_FEATURE_UNCOMPRESS
+	/* Magic header for compress files, 1F 9d = \037\235 */
+	if (( magic [0] == 0x1F ) && ( magic [1] == 0x9d)) {
+		return uncompress ( l_in_file, l_out_file );
+	}
+#endif
+
 	/* Magic header for gzip files, 1F 8B = \037\213 */
-	if ((fgetc(l_in_file) != 0x1F) || (fgetc(l_in_file) != 0x8b)) {
+	if (( magic [0] != 0x1F ) || ( magic [1] != 0x8b)) {
 		error_msg("Invalid gzip magic");
 		return EXIT_FAILURE;
 	}

sysdeps/linux/config.in

@@ -14,6 +14,7 @@ bool 'Show verbose applet usage messages'				CONFIG_FEATURE_VERBOSE_USAGE
 bool 'Support --install [-s] to install applet links at runtime' 	CONFIG_FEATURE_INSTALLER
 bool 'Enable locale support (system needs locale for this to work)'	CONFIG_LOCALE_SUPPORT
 bool 'Support for devfs'						CONFIG_FEATURE_DEVFS
+bool 'Support compress format (.Z) in unzip operations'  		CONFIG_FEATURE_UNCOMPRESS 
 bool 'Clean up all memory before exiting (usually not needed)'		CONFIG_FEATURE_CLEAN_UP
 endmenu