New common unarchive code.

libbb/Makefile.in

@@ -28,20 +28,22 @@ LIBBB_SRC:= \
 	copy_file_chunk.c dump.c libc5.c device_open.c error_msg.c \
 	error_msg_and_die.c fgets_str.c find_mount_point.c find_pid_by_name.c \
 	find_root_device.c full_read.c full_write.c get_console.c \
-	get_last_path_component.c get_line_from_file.c gz_open.c human_readable.c \
-	isdirectory.c kernel_version.c loop.c mode_string.c module_syscalls.c mtab.c \
-	mtab_file.c my_getgrnam.c my_getgrgid.c my_getpwnam.c my_getpwnamegid.c \
-	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 uncompress.c vdprintf.c verror_msg.c vperror_msg.c wfopen.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 \
-	simplify_path.c inet_common.c inode_hash.c obscure.c pwd2spwd.c xfuncs.c \
-	correct_password.c change_identity.c setup_environment.c run_shell.c \
-	pw_encrypt.c restricted_shell.c xgethostbyname2.c create_icmp6_socket.c \
-       xconnect.c bb_asprintf.c
+	get_last_path_component.c get_line_from_file.c  \
+	human_readable.c isdirectory.c kernel_version.c loop.c \
+	mode_string.c module_syscalls.c mtab.c mtab_file.c my_getgrnam.c \
+	my_getgrgid.c my_getpwnam.c my_getpwnamegid.c 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 uncompress.c \
+	vdprintf.c verror_msg.c vperror_msg.c wfopen.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 simplify_path.c inet_common.c inode_hash.c obscure.c \
+	pwd2spwd.c xfuncs.c correct_password.c change_identity.c \
+	setup_environment.c run_shell.c pw_encrypt.c restricted_shell.c \
+	xgethostbyname2.c create_icmp6_socket.c xconnect.c bb_asprintf.c
 
 LIBBB_OBJS=$(patsubst %.c,$(LIBBB_DIR)%.o, $(LIBBB_SRC))
 

libbb/xfuncs.c

@@ -19,10 +19,13 @@
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  */
 
+#include <sys/types.h>
+#include <sys/stat.h>
 #include <stdio.h>
 #include <string.h>
 #include <stdlib.h>
 #include <unistd.h>
+#include <fcntl.h>
 #include "libbb.h"
 
 
@@ -85,6 +88,59 @@ FILE *xfopen(const char *path, const char *mode)
 	return fp;
 }
 
+extern int xopen(const char *pathname, int flags)
+{
+	int ret;
+	
+	ret = open(pathname, flags);
+	if (ret == -1) {
+		perror_msg_and_die("%s", pathname);
+	}
+	return ret;
+}
+
+extern ssize_t xread(int fd, void *buf, size_t count)
+{
+	ssize_t size;
+
+	size = read(fd, buf, count);
+	if (size == -1) {
+		perror_msg_and_die("Read error");
+	}
+	return(size);
+}
+
+extern void xread_all(int fd, void *buf, size_t count)
+{
+	ssize_t size;
+
+	size = xread(fd, buf, count);
+	if (size != count) {
+		error_msg_and_die("Short read");
+	}
+	return;
+}
+
+extern ssize_t xread_all_eof(int fd, void *buf, size_t count)
+{
+	ssize_t size;
+
+	size = xread(fd, buf, count);
+	if ((size != 0) && (size != count)) {
+		error_msg_and_die("Short read");
+	}
+	return(size);
+}
+
+extern unsigned char xread_char(int fd)
+{
+	char tmp;
+	
+	xread_all(fd, &tmp, 1);
+
+	return(tmp);	
+}
+
 /* Stupid gcc always includes its own builtin strlen()... */
 #undef strlen
 size_t xstrlen(const char *string)