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-rw-r--r--archival/libunarchive/open_transformer.c50
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diff --git a/archival/libunarchive/open_transformer.c b/archival/libunarchive/open_transformer.c
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+++ b/archival/libunarchive/open_transformer.c
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+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#include <stdlib.h>
+#include <unistd.h>
+
+#include "libbb.h"
+
+/* transformer(), more than meets the eye */
+extern int open_transformer(int src_fd, int (*transformer)(int src_fd, int dst_fd))
+{
+ int fd_pipe[2];
+ int pid;
+
+ if (pipe(fd_pipe) != 0) {
+ bb_perror_msg_and_die("Can't create pipe");
+ }
+
+ pid = fork();
+ if (pid == -1) {
+ bb_perror_msg_and_die("Fork failed");
+ }
+
+ if (pid == 0) {
+ /* child process */
+ close(fd_pipe[0]); /* We don't wan't to read from the pipe */
+ transformer(src_fd, fd_pipe[1]);
+ close(fd_pipe[1]); /* Send EOF */
+ exit(0);
+ /* notreached */
+ }
+ /* parent process */
+ close(fd_pipe[1]); /* Don't want to write down the pipe */
+ close(src_fd);
+
+ return(fd_pipe[0]);
+}