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

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


git-svn-id: svn://busybox.net/trunk/busybox@4778 69ca8d6d-28ef-0310-b511-8ec308f3f277

2 files changed, 18 insertions, 2 deletions

diff --git a/libbb/Makefile.in b/libbb/Makefile.in
index 6d098c0e5..c6493bfa6 100644
--- a/libbb/Makefile.in
+++ b/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 \
diff --git a/libbb/unzip.c b/libbb/unzip.c
index 9f6ed2ebe..cde16d067 100644
--- a/libbb/unzip.c
+++ b/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;
         }