1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 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 */ 40 void 41 bs_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 */ 48 void 49 bs_reset(bin_stream_t * bs) 50 { 51 bs->pos = 0; 52 } 53 54 /* Write a zero-terminated string; return next position */ 55 unsigned 56 bs_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 */ 68 unsigned 69 bs_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. */ 79 unsigned 80 bs_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. */ 87 unsigned 88 bs_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. */ 95 unsigned 96 bs_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. */ 103 unsigned 104 bs_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 */ 111 uint8_t 112 bs_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 */ 124 char* 125 bs_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. */ 140 void 141 bs_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 */ 150 uint16_t 151 bs_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 */ 159 uint32_t 160 bs_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 */ 168 uint64_t 169 bs_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