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 */ 41 void 42 bs_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 */ 50 void 51 bs_reset(bin_stream_t * bs) 52 { 53 bs->pos = 0; 54 } 55 56 /* Write a zero-terminated string; return next position */ 57 unsigned 58 bs_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 */ 71 unsigned 72 bs_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. */ 83 unsigned 84 bs_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. */ 92 unsigned 93 bs_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. */ 101 unsigned 102 bs_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. */ 110 unsigned 111 bs_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 */ 119 uint8_t 120 bs_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 */ 133 char* 134 bs_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. */ 150 void 151 bs_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 */ 161 uint16_t 162 bs_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 */ 171 uint32_t 172 bs_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 */ 181 uint64_t 182 bs_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