2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2005 Ivan Voras <ivoras@gmail.com>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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.
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
29 // $Id: binstream.c,v 1.1 2006/07/05 10:47:54 ivoras Exp $
31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD$");
34 #include <sys/endian.h>
35 #include <sys/param.h>
37 #include <geom/virstor/binstream.h>
40 /* "Open" a binary stream for reading */
42 bs_open(bin_stream_t * bs, void *data)
44 bs->data = (char *)data;
49 /* "Reset" position in binary stream to zero */
51 bs_reset(bin_stream_t * bs)
56 /* Write a zero-terminated string; return next position */
58 bs_write_str(bin_stream_t * bs, char *data)
62 *(bs->data + bs->pos + len) = *data;
64 } while (*(data++) != '\0');
70 /* Write an arbitrary buffer; return next position */
72 bs_write_buf(bin_stream_t * bs, char *data, unsigned data_size)
75 for (i = 0; i < data_size; i++)
76 *(bs->data + bs->pos + i) = *(data + i);
82 /* Write a 8bit uint; return next position. */
84 bs_write_u8(bin_stream_t * bs, uint8_t data)
86 *((uint8_t *) (bs->data + bs->pos)) = data;
91 /* Write a 16bit uint; return next position. */
93 bs_write_u16(bin_stream_t * bs, uint16_t data)
95 le16enc(bs->data + bs->pos, data);
96 return (bs->pos += 2);
100 /* Write a 32bit uint; return next position. */
102 bs_write_u32(bin_stream_t * bs, uint32_t data)
104 le32enc(bs->data + bs->pos, data);
105 return (bs->pos += 4);
109 /* Write a 64bit uint; return next position. */
111 bs_write_u64(bin_stream_t * bs, uint64_t data)
113 le64enc(bs->data + bs->pos, data);
114 return (bs->pos += 8);
118 /* Read a 8bit uint & return it */
120 bs_read_u8(bin_stream_t * bs)
122 uint8_t data = *((uint8_t *) (bs->data + bs->pos));
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
134 bs_read_str(bin_stream_t * bs, char *buf, unsigned buf_size)
137 char *work_buf = buf;
138 if (buf == NULL || buf_size < 1)
141 *work_buf = *(bs->data + bs->pos + len);
142 } while (len++ < buf_size - 1 && *(work_buf++) != '\0');
143 *(buf + buf_size - 1) = '\0';
149 /* Read an arbitrary buffer. */
151 bs_read_buf(bin_stream_t * bs, char *buf, unsigned buf_size)
154 for (i = 0; i < buf_size; i++)
155 *(buf + i) = *(bs->data + bs->pos + i);
160 /* Read a 16bit uint & return it */
162 bs_read_u16(bin_stream_t * bs)
164 uint16_t data = le16dec(bs->data + bs->pos);
170 /* Read a 32bit uint & return it */
172 bs_read_u32(bin_stream_t * bs)
174 uint32_t data = le32dec(bs->data + bs->pos);
180 /* Read a 64bit uint & return it */
182 bs_read_u64(bin_stream_t * bs)
184 uint64_t data = le64dec(bs->data + bs->pos);