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/* "Open" a binary stream for reading */
40void
41bs_open(bin_stream_t * bs, void *data)
42{
43	bs->data = (char *)data;
44	bs->pos = 0;
45}
46
47/* "Reset" position in binary stream to zero */
48void
49bs_reset(bin_stream_t * bs)
50{
51	bs->pos = 0;
52}
53
54/* Write a zero-terminated string; return next position */
55unsigned
56bs_write_str(bin_stream_t * bs, char *data)
57{
58	int		len = 0;
59	do {
60		*(bs->data + bs->pos + len) = *data;
61		len++;
62	} while (*(data++) != '\0');
63	bs->pos += len;
64	return bs->pos;
65}
66
67/* Write an arbitrary buffer; return next position */
68unsigned
69bs_write_buf(bin_stream_t * bs, char *data, unsigned data_size)
70{
71	unsigned	i;
72	for (i = 0; i < data_size; i++)
73		*(bs->data + bs->pos + i) = *(data + i);
74	bs->pos += data_size;
75	return bs->pos;
76}
77
78/* Write a 8bit uint; return next position. */
79unsigned
80bs_write_u8(bin_stream_t * bs, uint8_t data)
81{
82	*((uint8_t *) (bs->data + bs->pos)) = data;
83	return ++(bs->pos);
84}
85
86/* Write a 16bit uint; return next position. */
87unsigned
88bs_write_u16(bin_stream_t * bs, uint16_t data)
89{
90	le16enc(bs->data + bs->pos, data);
91	return (bs->pos += 2);
92}
93
94/* Write a 32bit uint; return next position. */
95unsigned
96bs_write_u32(bin_stream_t * bs, uint32_t data)
97{
98	le32enc(bs->data + bs->pos, data);
99	return (bs->pos += 4);
100}
101
102/* Write a 64bit uint; return next position. */
103unsigned
104bs_write_u64(bin_stream_t * bs, uint64_t data)
105{
106	le64enc(bs->data + bs->pos, data);
107	return (bs->pos += 8);
108}
109
110/* Read a 8bit uint & return it */
111uint8_t
112bs_read_u8(bin_stream_t * bs)
113{
114	uint8_t		data = *((uint8_t *) (bs->data + bs->pos));
115	bs->pos++;
116	return data;
117}
118
119/*
120 * Read a null-terminated string from stream into a buffer; buf_size is size
121 * of the buffer, including the final \0. Returns buf pointer or NULL if
122 * garbage input.
123 */
124char*
125bs_read_str(bin_stream_t * bs, char *buf, unsigned buf_size)
126{
127	unsigned	len = 0;
128	char           *work_buf = buf;
129	if (buf == NULL || buf_size < 1)
130		return NULL;
131	do {
132		*work_buf = *(bs->data + bs->pos + len);
133	} while (len++ < buf_size - 1 && *(work_buf++) != '\0');
134	*(buf + buf_size - 1) = '\0';
135	bs->pos += len;
136	return buf;
137}
138
139/* Read an arbitrary buffer. */
140void
141bs_read_buf(bin_stream_t * bs, char *buf, unsigned buf_size)
142{
143	unsigned	i;
144	for (i = 0; i < buf_size; i++)
145		*(buf + i) = *(bs->data + bs->pos + i);
146	bs->pos += buf_size;
147}
148
149/* Read a 16bit uint & return it */
150uint16_t
151bs_read_u16(bin_stream_t * bs)
152{
153	uint16_t	data = le16dec(bs->data + bs->pos);
154	bs->pos += 2;
155	return data;
156}
157
158/* Read a 32bit uint & return it */
159uint32_t
160bs_read_u32(bin_stream_t * bs)
161{
162	uint32_t	data = le32dec(bs->data + bs->pos);
163	bs->pos += 4;
164	return data;
165}
166
167/* Read a 64bit uint & return it */
168uint64_t
169bs_read_u64(bin_stream_t * bs)
170{
171	uint64_t	data = le64dec(bs->data + bs->pos);
172	bs->pos += 8;
173	return data;
174}
175