Bring in the GEOM Virtualisation class, which allows to create huge GEOM

providers with limited physical storage and add physical storage as
needed.

Submitted by:	Ivan Voras
Sponsored by:	Google Summer of Code 2006
Approved by:	re (kensmith)

1 files changed, 185 insertions, 0 deletions

diff --git a/sys/geom/virstor/binstream.c b/sys/geom/virstor/binstream.c
new file mode 100644
index 000000000000..bbbafdb581ed
--- /dev/null
+++ b/sys/geom/virstor/binstream.c
@@ -0,0 +1,185 @@
+/*-
+ * Copyright (c) 2005 Ivan Voras <ivoras@gmail.com>
+ * 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 AUTHORS AND CONTRIBUTORS ``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 AUTHORS 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.
+ */
+
+// $Id: binstream.c,v 1.1 2006/07/05 10:47:54 ivoras Exp $
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/endian.h>
+#include <sys/param.h>
+
+#include <geom/virstor/binstream.h>
+
+
+/* "Open" a binary stream for reading */
+void
+bs_open(bin_stream_t * bs, void *data)
+{
+	bs->data = (char *)data;
+	bs->pos = 0;
+}
+
+
+/* "Reset" position in binary stream to zero */
+void
+bs_reset(bin_stream_t * bs)
+{
+	bs->pos = 0;
+}
+
+/* Write a zero-terminated string; return next position */
+unsigned
+bs_write_str(bin_stream_t * bs, char *data)
+{
+	int		len = 0;
+	do {
+		*(bs->data + bs->pos + len) = *data;
+		len++;
+	} while (*(data++) != '\0');
+	bs->pos += len;
+	return bs->pos;
+}
+
+
+/* Write an arbitrary buffer; return next position */
+unsigned
+bs_write_buf(bin_stream_t * bs, char *data, unsigned data_size)
+{
+	unsigned	i;
+	for (i = 0; i < data_size; i++)
+		*(bs->data + bs->pos + i) = *(data + i);
+	bs->pos += data_size;
+	return bs->pos;
+}
+
+
+/* Write a 8bit uint; return next position. */
+unsigned
+bs_write_u8(bin_stream_t * bs, uint8_t data)
+{
+	*((uint8_t *) (bs->data + bs->pos)) = data;
+	return ++(bs->pos);
+}
+
+
+/* Write a 16bit uint; return next position. */
+unsigned
+bs_write_u16(bin_stream_t * bs, uint16_t data)
+{
+	le16enc(bs->data + bs->pos, data);
+	return (bs->pos += 2);
+}
+
+
+/* Write a 32bit uint; return next position. */
+unsigned
+bs_write_u32(bin_stream_t * bs, uint32_t data)
+{
+	le32enc(bs->data + bs->pos, data);
+	return (bs->pos += 4);
+}
+
+
+/* Write a 64bit uint; return next position. */
+unsigned
+bs_write_u64(bin_stream_t * bs, uint64_t data)
+{
+	le64enc(bs->data + bs->pos, data);
+	return (bs->pos += 8);
+}
+
+
+/* Read a 8bit uint & return it */
+uint8_t
+bs_read_u8(bin_stream_t * bs)
+{
+	uint8_t		data = *((uint8_t *) (bs->data + bs->pos));
+	bs->pos++;
+	return data;
+}
+
+
+/*
+ * Read a null-terminated string from stream into a buffer; buf_size is size
+ * of the buffer, including the final \0. Returns buf pointer or NULL if
+ * garbage input.
+ */
+char*
+bs_read_str(bin_stream_t * bs, char *buf, unsigned buf_size)
+{
+	unsigned	len = 0;
+	char           *work_buf = buf;
+	if (buf == NULL || buf_size < 1)
+		return NULL;
+	do {
+		*work_buf = *(bs->data + bs->pos + len);
+	} while (len++ < buf_size - 1 && *(work_buf++) != '\0');
+	*(buf + buf_size - 1) = '\0';
+	bs->pos += len;
+	return buf;
+}
+
+
+/* Read an arbitrary buffer. */
+void
+bs_read_buf(bin_stream_t * bs, char *buf, unsigned buf_size)
+{
+	unsigned	i;
+	for (i = 0; i < buf_size; i++)
+		*(buf + i) = *(bs->data + bs->pos + i);
+	bs->pos += buf_size;
+}
+
+
+/* Read a 16bit uint & return it */
+uint16_t
+bs_read_u16(bin_stream_t * bs)
+{
+	uint16_t	data = le16dec(bs->data + bs->pos);
+	bs->pos += 2;
+	return data;
+}
+
+
+/* Read a 32bit uint & return it */
+uint32_t
+bs_read_u32(bin_stream_t * bs)
+{
+	uint32_t	data = le32dec(bs->data + bs->pos);
+	bs->pos += 4;
+	return data;
+}
+
+
+/* Read a 64bit uint & return it */
+uint64_t
+bs_read_u64(bin_stream_t * bs)
+{
+	uint64_t	data = le64dec(bs->data + bs->pos);
+	bs->pos += 8;
+	return data;
+}