1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
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 #include <sys/endian.h>
33 #include <sys/param.h>
34
35 #include <geom/virstor/binstream.h>
36
37 /* "Open" a binary stream for reading */
38 void
bs_open(bin_stream_t * bs,void * data)39 bs_open(bin_stream_t * bs, void *data)
40 {
41 bs->data = (char *)data;
42 bs->pos = 0;
43 }
44
45 /* "Reset" position in binary stream to zero */
46 void
bs_reset(bin_stream_t * bs)47 bs_reset(bin_stream_t * bs)
48 {
49 bs->pos = 0;
50 }
51
52 /* Write a zero-terminated string; return next position */
53 unsigned
bs_write_str(bin_stream_t * bs,char * data)54 bs_write_str(bin_stream_t * bs, char *data)
55 {
56 int len = 0;
57 do {
58 *(bs->data + bs->pos + len) = *data;
59 len++;
60 } while (*(data++) != '\0');
61 bs->pos += len;
62 return bs->pos;
63 }
64
65 /* Write an arbitrary buffer; return next position */
66 unsigned
bs_write_buf(bin_stream_t * bs,char * data,unsigned data_size)67 bs_write_buf(bin_stream_t * bs, char *data, unsigned data_size)
68 {
69 unsigned i;
70 for (i = 0; i < data_size; i++)
71 *(bs->data + bs->pos + i) = *(data + i);
72 bs->pos += data_size;
73 return bs->pos;
74 }
75
76 /* Write a 8bit uint; return next position. */
77 unsigned
bs_write_u8(bin_stream_t * bs,uint8_t data)78 bs_write_u8(bin_stream_t * bs, uint8_t data)
79 {
80 *((uint8_t *) (bs->data + bs->pos)) = data;
81 return ++(bs->pos);
82 }
83
84 /* Write a 16bit uint; return next position. */
85 unsigned
bs_write_u16(bin_stream_t * bs,uint16_t data)86 bs_write_u16(bin_stream_t * bs, uint16_t data)
87 {
88 le16enc(bs->data + bs->pos, data);
89 return (bs->pos += 2);
90 }
91
92 /* Write a 32bit uint; return next position. */
93 unsigned
bs_write_u32(bin_stream_t * bs,uint32_t data)94 bs_write_u32(bin_stream_t * bs, uint32_t data)
95 {
96 le32enc(bs->data + bs->pos, data);
97 return (bs->pos += 4);
98 }
99
100 /* Write a 64bit uint; return next position. */
101 unsigned
bs_write_u64(bin_stream_t * bs,uint64_t data)102 bs_write_u64(bin_stream_t * bs, uint64_t data)
103 {
104 le64enc(bs->data + bs->pos, data);
105 return (bs->pos += 8);
106 }
107
108 /* Read a 8bit uint & return it */
109 uint8_t
bs_read_u8(bin_stream_t * bs)110 bs_read_u8(bin_stream_t * bs)
111 {
112 uint8_t data = *((uint8_t *) (bs->data + bs->pos));
113 bs->pos++;
114 return data;
115 }
116
117 /*
118 * Read a null-terminated string from stream into a buffer; buf_size is size
119 * of the buffer, including the final \0. Returns buf pointer or NULL if
120 * garbage input.
121 */
122 char*
bs_read_str(bin_stream_t * bs,char * buf,unsigned buf_size)123 bs_read_str(bin_stream_t * bs, char *buf, unsigned buf_size)
124 {
125 unsigned len = 0;
126 char *work_buf = buf;
127 if (buf == NULL || buf_size < 1)
128 return NULL;
129 do {
130 *work_buf = *(bs->data + bs->pos + len);
131 } while (len++ < buf_size - 1 && *(work_buf++) != '\0');
132 *(buf + buf_size - 1) = '\0';
133 bs->pos += len;
134 return buf;
135 }
136
137 /* Read an arbitrary buffer. */
138 void
bs_read_buf(bin_stream_t * bs,char * buf,unsigned buf_size)139 bs_read_buf(bin_stream_t * bs, char *buf, unsigned buf_size)
140 {
141 unsigned i;
142 for (i = 0; i < buf_size; i++)
143 *(buf + i) = *(bs->data + bs->pos + i);
144 bs->pos += buf_size;
145 }
146
147 /* Read a 16bit uint & return it */
148 uint16_t
bs_read_u16(bin_stream_t * bs)149 bs_read_u16(bin_stream_t * bs)
150 {
151 uint16_t data = le16dec(bs->data + bs->pos);
152 bs->pos += 2;
153 return data;
154 }
155
156 /* Read a 32bit uint & return it */
157 uint32_t
bs_read_u32(bin_stream_t * bs)158 bs_read_u32(bin_stream_t * bs)
159 {
160 uint32_t data = le32dec(bs->data + bs->pos);
161 bs->pos += 4;
162 return data;
163 }
164
165 /* Read a 64bit uint & return it */
166 uint64_t
bs_read_u64(bin_stream_t * bs)167 bs_read_u64(bin_stream_t * bs)
168 {
169 uint64_t data = le64dec(bs->data + bs->pos);
170 bs->pos += 8;
171 return data;
172 }
173