1 /*- 2 * Copyright (c) 2005 Ivan Voras <ivoras@gmail.com> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 // $Id: binstream.c,v 1.1 2006/07/05 10:47:54 ivoras Exp $ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include <sys/endian.h> 33 #include <sys/param.h> 34 35 #include <geom/virstor/binstream.h> 36 37 38 /* "Open" a binary stream for reading */ 39 void 40 bs_open(bin_stream_t * bs, void *data) 41 { 42 bs->data = (char *)data; 43 bs->pos = 0; 44 } 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 68 /* Write an arbitrary buffer; return next position */ 69 unsigned 70 bs_write_buf(bin_stream_t * bs, char *data, unsigned data_size) 71 { 72 unsigned i; 73 for (i = 0; i < data_size; i++) 74 *(bs->data + bs->pos + i) = *(data + i); 75 bs->pos += data_size; 76 return bs->pos; 77 } 78 79 80 /* Write a 8bit uint; return next position. */ 81 unsigned 82 bs_write_u8(bin_stream_t * bs, uint8_t data) 83 { 84 *((uint8_t *) (bs->data + bs->pos)) = data; 85 return ++(bs->pos); 86 } 87 88 89 /* Write a 16bit uint; return next position. */ 90 unsigned 91 bs_write_u16(bin_stream_t * bs, uint16_t data) 92 { 93 le16enc(bs->data + bs->pos, data); 94 return (bs->pos += 2); 95 } 96 97 98 /* Write a 32bit uint; return next position. */ 99 unsigned 100 bs_write_u32(bin_stream_t * bs, uint32_t data) 101 { 102 le32enc(bs->data + bs->pos, data); 103 return (bs->pos += 4); 104 } 105 106 107 /* Write a 64bit uint; return next position. */ 108 unsigned 109 bs_write_u64(bin_stream_t * bs, uint64_t data) 110 { 111 le64enc(bs->data + bs->pos, data); 112 return (bs->pos += 8); 113 } 114 115 116 /* Read a 8bit uint & return it */ 117 uint8_t 118 bs_read_u8(bin_stream_t * bs) 119 { 120 uint8_t data = *((uint8_t *) (bs->data + bs->pos)); 121 bs->pos++; 122 return data; 123 } 124 125 126 /* 127 * Read a null-terminated string from stream into a buffer; buf_size is size 128 * of the buffer, including the final \0. Returns buf pointer or NULL if 129 * garbage input. 130 */ 131 char* 132 bs_read_str(bin_stream_t * bs, char *buf, unsigned buf_size) 133 { 134 unsigned len = 0; 135 char *work_buf = buf; 136 if (buf == NULL || buf_size < 1) 137 return NULL; 138 do { 139 *work_buf = *(bs->data + bs->pos + len); 140 } while (len++ < buf_size - 1 && *(work_buf++) != '\0'); 141 *(buf + buf_size - 1) = '\0'; 142 bs->pos += len; 143 return buf; 144 } 145 146 147 /* Read an arbitrary buffer. */ 148 void 149 bs_read_buf(bin_stream_t * bs, char *buf, unsigned buf_size) 150 { 151 unsigned i; 152 for (i = 0; i < buf_size; i++) 153 *(buf + i) = *(bs->data + bs->pos + i); 154 bs->pos += buf_size; 155 } 156 157 158 /* Read a 16bit uint & return it */ 159 uint16_t 160 bs_read_u16(bin_stream_t * bs) 161 { 162 uint16_t data = le16dec(bs->data + bs->pos); 163 bs->pos += 2; 164 return data; 165 } 166 167 168 /* Read a 32bit uint & return it */ 169 uint32_t 170 bs_read_u32(bin_stream_t * bs) 171 { 172 uint32_t data = le32dec(bs->data + bs->pos); 173 bs->pos += 4; 174 return data; 175 } 176 177 178 /* Read a 64bit uint & return it */ 179 uint64_t 180 bs_read_u64(bin_stream_t * bs) 181 { 182 uint64_t data = le64dec(bs->data + bs->pos); 183 bs->pos += 8; 184 return data; 185 } 186