2 * Copyright (c) 2005 Ivan Voras <ivoras@gmail.com>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 // $Id: binstream.c,v 1.1 2006/07/05 10:47:54 ivoras Exp $
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
32 #include <sys/endian.h>
33 #include <sys/param.h>
35 #include <geom/virstor/binstream.h>
38 /* "Open" a binary stream for reading */
40 bs_open(bin_stream_t * bs, void *data)
42 bs->data = (char *)data;
47 /* "Reset" position in binary stream to zero */
49 bs_reset(bin_stream_t * bs)
54 /* Write a zero-terminated string; return next position */
56 bs_write_str(bin_stream_t * bs, char *data)
60 *(bs->data + bs->pos + len) = *data;
62 } while (*(data++) != '\0');
68 /* Write an arbitrary buffer; return next position */
70 bs_write_buf(bin_stream_t * bs, char *data, unsigned data_size)
73 for (i = 0; i < data_size; i++)
74 *(bs->data + bs->pos + i) = *(data + i);
80 /* Write a 8bit uint; return next position. */
82 bs_write_u8(bin_stream_t * bs, uint8_t data)
84 *((uint8_t *) (bs->data + bs->pos)) = data;
89 /* Write a 16bit uint; return next position. */
91 bs_write_u16(bin_stream_t * bs, uint16_t data)
93 le16enc(bs->data + bs->pos, data);
94 return (bs->pos += 2);
98 /* Write a 32bit uint; return next position. */
100 bs_write_u32(bin_stream_t * bs, uint32_t data)
102 le32enc(bs->data + bs->pos, data);
103 return (bs->pos += 4);
107 /* Write a 64bit uint; return next position. */
109 bs_write_u64(bin_stream_t * bs, uint64_t data)
111 le64enc(bs->data + bs->pos, data);
112 return (bs->pos += 8);
116 /* Read a 8bit uint & return it */
118 bs_read_u8(bin_stream_t * bs)
120 uint8_t data = *((uint8_t *) (bs->data + bs->pos));
127 * Read a null-terminated string from stream into a buffer; buf_size is size
128 * of the buffer, including the final \0. Returns buf pointer or NULL if
132 bs_read_str(bin_stream_t * bs, char *buf, unsigned buf_size)
135 char *work_buf = buf;
136 if (buf == NULL || buf_size < 1)
139 *work_buf = *(bs->data + bs->pos + len);
140 } while (len++ < buf_size - 1 && *(work_buf++) != '\0');
141 *(buf + buf_size - 1) = '\0';
147 /* Read an arbitrary buffer. */
149 bs_read_buf(bin_stream_t * bs, char *buf, unsigned buf_size)
152 for (i = 0; i < buf_size; i++)
153 *(buf + i) = *(bs->data + bs->pos + i);
158 /* Read a 16bit uint & return it */
160 bs_read_u16(bin_stream_t * bs)
162 uint16_t data = le16dec(bs->data + bs->pos);
168 /* Read a 32bit uint & return it */
170 bs_read_u32(bin_stream_t * bs)
172 uint32_t data = le32dec(bs->data + bs->pos);
178 /* Read a 64bit uint & return it */
180 bs_read_u64(bin_stream_t * bs)
182 uint64_t data = le64dec(bs->data + bs->pos);