1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2005 Ivan Voras <ivoras@gmail.com>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29// $Id: binstream.c,v 1.1 2006/07/05 10:47:54 ivoras Exp $
30
31#include <sys/cdefs.h>
32__FBSDID("$FreeBSD$");
33
34#include <sys/endian.h>
35#include <sys/param.h>
36
37#include <geom/virstor/binstream.h>
38
39
40/* "Open" a binary stream for reading */
41void
42bs_open(bin_stream_t * bs, void *data)
43{
44	bs->data = (char *)data;
45	bs->pos = 0;
46}
47
48
49/* "Reset" position in binary stream to zero */
50void
51bs_reset(bin_stream_t * bs)
52{
53	bs->pos = 0;
54}
55
56/* Write a zero-terminated string; return next position */
57unsigned
58bs_write_str(bin_stream_t * bs, char *data)
59{
60	int		len = 0;
61	do {
62		*(bs->data + bs->pos + len) = *data;
63		len++;
64	} while (*(data++) != '\0');
65	bs->pos += len;
66	return bs->pos;
67}
68
69
70/* Write an arbitrary buffer; return next position */
71unsigned
72bs_write_buf(bin_stream_t * bs, char *data, unsigned data_size)
73{
74	unsigned	i;
75	for (i = 0; i < data_size; i++)
76		*(bs->data + bs->pos + i) = *(data + i);
77	bs->pos += data_size;
78	return bs->pos;
79}
80
81
82/* Write a 8bit uint; return next position. */
83unsigned
84bs_write_u8(bin_stream_t * bs, uint8_t data)
85{
86	*((uint8_t *) (bs->data + bs->pos)) = data;
87	return ++(bs->pos);
88}
89
90
91/* Write a 16bit uint; return next position. */
92unsigned
93bs_write_u16(bin_stream_t * bs, uint16_t data)
94{
95	le16enc(bs->data + bs->pos, data);
96	return (bs->pos += 2);
97}
98
99
100/* Write a 32bit uint; return next position. */
101unsigned
102bs_write_u32(bin_stream_t * bs, uint32_t data)
103{
104	le32enc(bs->data + bs->pos, data);
105	return (bs->pos += 4);
106}
107
108
109/* Write a 64bit uint; return next position. */
110unsigned
111bs_write_u64(bin_stream_t * bs, uint64_t data)
112{
113	le64enc(bs->data + bs->pos, data);
114	return (bs->pos += 8);
115}
116
117
118/* Read a 8bit uint & return it */
119uint8_t
120bs_read_u8(bin_stream_t * bs)
121{
122	uint8_t		data = *((uint8_t *) (bs->data + bs->pos));
123	bs->pos++;
124	return data;
125}
126
127
128/*
129 * Read a null-terminated string from stream into a buffer; buf_size is size
130 * of the buffer, including the final \0. Returns buf pointer or NULL if
131 * garbage input.
132 */
133char*
134bs_read_str(bin_stream_t * bs, char *buf, unsigned buf_size)
135{
136	unsigned	len = 0;
137	char           *work_buf = buf;
138	if (buf == NULL || buf_size < 1)
139		return NULL;
140	do {
141		*work_buf = *(bs->data + bs->pos + len);
142	} while (len++ < buf_size - 1 && *(work_buf++) != '\0');
143	*(buf + buf_size - 1) = '\0';
144	bs->pos += len;
145	return buf;
146}
147
148
149/* Read an arbitrary buffer. */
150void
151bs_read_buf(bin_stream_t * bs, char *buf, unsigned buf_size)
152{
153	unsigned	i;
154	for (i = 0; i < buf_size; i++)
155		*(buf + i) = *(bs->data + bs->pos + i);
156	bs->pos += buf_size;
157}
158
159
160/* Read a 16bit uint & return it */
161uint16_t
162bs_read_u16(bin_stream_t * bs)
163{
164	uint16_t	data = le16dec(bs->data + bs->pos);
165	bs->pos += 2;
166	return data;
167}
168
169
170/* Read a 32bit uint & return it */
171uint32_t
172bs_read_u32(bin_stream_t * bs)
173{
174	uint32_t	data = le32dec(bs->data + bs->pos);
175	bs->pos += 4;
176	return data;
177}
178
179
180/* Read a 64bit uint & return it */
181uint64_t
182bs_read_u64(bin_stream_t * bs)
183{
184	uint64_t	data = le64dec(bs->data + bs->pos);
185	bs->pos += 8;
186	return data;
187}
188