we kind of need this new file from canacar

1 files changed, 154 insertions, 0 deletions

diff --git a/usr.bin/compress/nullopen.c b/usr.bin/compress/nullopen.c
new file mode 100644
index 00000000000..b758310d33e
--- /dev/null
+++ b/usr.bin/compress/nullopen.c
@@ -0,0 +1,154 @@
+/*	$OpenBSD: nullopen.c,v 1.1 2003/09/05 06:08:15 deraadt Exp $	*/
+
+/*
+ * Copyright (c) 2003 Can Erkin Acar
+ * Copyright (c) 1997 Michael Shalayeff
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ */
+
+const char null_rcsid[] =
+    "$OpenBSD: nullopen.c,v 1.1 2003/09/05 06:08:15 deraadt Exp $";
+
+#include <sys/types.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <unistd.h>
+#include "compress.h"
+
+typedef struct {
+	off_t 	  total_in;
+	off_t 	  total_out;
+	int   	  fd;
+	int       gotmagic;
+	char	  mode;
+} null_stream;
+
+char null_magic[2];
+
+
+void *
+null_open(int fd, const char *mode, char *name, int bits,
+    u_int32_t mtime, int gotmagic)
+{
+	null_stream *s;
+
+	if (fd < 0 || !mode)
+		return NULL;
+
+	if ((mode[0] != 'r' && mode[0] != 'w') || mode[1] != '\0') {
+		errno = EINVAL;
+		return NULL;
+	}
+
+	if ((s = (null_stream *) calloc(1, sizeof(null_stream))) == NULL)
+		return NULL;
+
+	s->fd = fd;
+	s->gotmagic = gotmagic;
+	s->total_in = s->total_out = 0;
+	s->mode = mode[0];
+
+	return s;
+}
+
+int
+null_close(void *cookie, struct z_info *info)
+{
+	null_stream *s = (null_stream*) cookie;
+	int err = 0;
+
+	if (s == NULL)
+		return -1;
+
+
+	if (info != NULL) {
+		info->mtime = 0;
+		info->crc =  (u_int32_t)-1;
+		info->hlen = 0;
+		info->total_in = (off_t) s->total_in;
+		info->total_out = (off_t) s->total_out;
+	}
+
+	err = close(s->fd);
+
+	free(s);
+
+	return err;
+}
+
+int
+null_flush(void *cookie, int flush)
+{
+	null_stream *s = (null_stream*)cookie;
+	size_t len;
+	int done = 0;
+	int err;
+
+	if (s == NULL || s->mode != 'w') {
+		errno = EBADF;
+		return (-1);
+	}
+
+	return 0;
+}
+
+int
+null_read(void *cookie, char *buf, int len)
+{
+	null_stream *s = (null_stream*)cookie;
+
+	if (s == NULL) {
+		errno = EBADF;
+		return (-1);
+	}
+	if (s->gotmagic) {
+		if (len < 2) {
+			errno = EBADF;
+			return (-1);
+		}
+
+		buf[0] = null_magic[0];
+		buf[1] = null_magic[1];
+		s->gotmagic = 0;
+
+		return (2);
+	}
+
+	return read(s->fd, buf, len);
+}
+
+int
+null_write(void *cookie, const char *buf, int len)
+{
+	null_stream *s = (null_stream*)cookie;
+
+	if (s == NULL) {
+		errno = EBADF;
+		return (-1);
+	}
+
+	return write(s->fd, buf, len);
+}