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