The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/geom/virstor/binstream.c

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    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 }

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