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 #include <sys/endian.h> 33 #include <sys/param.h> 34 35 #include <geom/virstor/binstream.h> 36 37 /* "Open" a binary stream for reading */ 38 void 39 bs_open(bin_stream_t * bs, void *data) 40 { 41 bs->data = (char *)data; 42 bs->pos = 0; 43 } 44 45 /* "Reset" position in binary stream to zero */ 46 void 47 bs_reset(bin_stream_t * bs) 48 { 49 bs->pos = 0; 50 } 51 52 /* Write a zero-terminated string; return next position */ 53 unsigned 54 bs_write_str(bin_stream_t * bs, char *data) 55 { 56 int len = 0; 57 do { 58 *(bs->data + bs->pos + len) = *data; 59 len++; 60 } while (*(data++) != '\0'); 61 bs->pos += len; 62 return bs->pos; 63 } 64 65 /* Write an arbitrary buffer; return next position */ 66 unsigned 67 bs_write_buf(bin_stream_t * bs, char *data, unsigned data_size) 68 { 69 unsigned i; 70 for (i = 0; i < data_size; i++) 71 *(bs->data + bs->pos + i) = *(data + i); 72 bs->pos += data_size; 73 return bs->pos; 74 } 75 76 /* Write a 8bit uint; return next position. */ 77 unsigned 78 bs_write_u8(bin_stream_t * bs, uint8_t data) 79 { 80 *((uint8_t *) (bs->data + bs->pos)) = data; 81 return ++(bs->pos); 82 } 83 84 /* Write a 16bit uint; return next position. */ 85 unsigned 86 bs_write_u16(bin_stream_t * bs, uint16_t data) 87 { 88 le16enc(bs->data + bs->pos, data); 89 return (bs->pos += 2); 90 } 91 92 /* Write a 32bit uint; return next position. */ 93 unsigned 94 bs_write_u32(bin_stream_t * bs, uint32_t data) 95 { 96 le32enc(bs->data + bs->pos, data); 97 return (bs->pos += 4); 98 } 99 100 /* Write a 64bit uint; return next position. */ 101 unsigned 102 bs_write_u64(bin_stream_t * bs, uint64_t data) 103 { 104 le64enc(bs->data + bs->pos, data); 105 return (bs->pos += 8); 106 } 107 108 /* Read a 8bit uint & return it */ 109 uint8_t 110 bs_read_u8(bin_stream_t * bs) 111 { 112 uint8_t data = *((uint8_t *) (bs->data + bs->pos)); 113 bs->pos++; 114 return data; 115 } 116 117 /* 118 * Read a null-terminated string from stream into a buffer; buf_size is size 119 * of the buffer, including the final \0. Returns buf pointer or NULL if 120 * garbage input. 121 */ 122 char* 123 bs_read_str(bin_stream_t * bs, char *buf, unsigned buf_size) 124 { 125 unsigned len = 0; 126 char *work_buf = buf; 127 if (buf == NULL || buf_size < 1) 128 return NULL; 129 do { 130 *work_buf = *(bs->data + bs->pos + len); 131 } while (len++ < buf_size - 1 && *(work_buf++) != '\0'); 132 *(buf + buf_size - 1) = '\0'; 133 bs->pos += len; 134 return buf; 135 } 136 137 /* Read an arbitrary buffer. */ 138 void 139 bs_read_buf(bin_stream_t * bs, char *buf, unsigned buf_size) 140 { 141 unsigned i; 142 for (i = 0; i < buf_size; i++) 143 *(buf + i) = *(bs->data + bs->pos + i); 144 bs->pos += buf_size; 145 } 146 147 /* Read a 16bit uint & return it */ 148 uint16_t 149 bs_read_u16(bin_stream_t * bs) 150 { 151 uint16_t data = le16dec(bs->data + bs->pos); 152 bs->pos += 2; 153 return data; 154 } 155 156 /* Read a 32bit uint & return it */ 157 uint32_t 158 bs_read_u32(bin_stream_t * bs) 159 { 160 uint32_t data = le32dec(bs->data + bs->pos); 161 bs->pos += 4; 162 return data; 163 } 164 165 /* Read a 64bit uint & return it */ 166 uint64_t 167 bs_read_u64(bin_stream_t * bs) 168 { 169 uint64_t data = le64dec(bs->data + bs->pos); 170 bs->pos += 8; 171 return data; 172 } 173