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