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

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (c) 2005 Ivan Voras <ivoras@gmail.com>
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     */
    
    // $Id: binstream.c,v 1.1 2006/07/05 10:47:54 ivoras Exp $
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #include <sys/endian.h>
    #include <sys/param.h>
    
    #include <geom/virstor/binstream.h>
    
    /* "Open" a binary stream for reading */
    void
    bs_open(bin_stream_t * bs, void *data)
    {
            bs->data = (char *)data;
            bs->pos = 0;
    }
    
    /* "Reset" position in binary stream to zero */
    void
    bs_reset(bin_stream_t * bs)
    {
            bs->pos = 0;
    }
    
    /* Write a zero-terminated string; return next position */
    unsigned
    bs_write_str(bin_stream_t * bs, char *data)
    {
            int             len = 0;
            do {
                    *(bs->data + bs->pos + len) = *data;
                    len++;
            } while (*(data++) != '\0');
            bs->pos += len;
            return bs->pos;
    }
    
    /* Write an arbitrary buffer; return next position */
    unsigned
    bs_write_buf(bin_stream_t * bs, char *data, unsigned data_size)
    {
            unsigned        i;
            for (i = 0; i < data_size; i++)
                    *(bs->data + bs->pos + i) = *(data + i);
            bs->pos += data_size;
            return bs->pos;
    }
    
    /* Write a 8bit uint; return next position. */
    unsigned
    bs_write_u8(bin_stream_t * bs, uint8_t data)
    {
            *((uint8_t *) (bs->data + bs->pos)) = data;
            return ++(bs->pos);
    }
    
    /* Write a 16bit uint; return next position. */
    unsigned
    bs_write_u16(bin_stream_t * bs, uint16_t data)
    {
            le16enc(bs->data + bs->pos, data);
            return (bs->pos += 2);
    }
    
    /* Write a 32bit uint; return next position. */
    unsigned
    bs_write_u32(bin_stream_t * bs, uint32_t data)
    {
            le32enc(bs->data + bs->pos, data);
            return (bs->pos += 4);
   }
   
   /* Write a 64bit uint; return next position. */
   unsigned
   bs_write_u64(bin_stream_t * bs, uint64_t data)
   {
           le64enc(bs->data + bs->pos, data);
           return (bs->pos += 8);
   }
   
   /* Read a 8bit uint & return it */
   uint8_t
   bs_read_u8(bin_stream_t * bs)
   {
           uint8_t         data = *((uint8_t *) (bs->data + bs->pos));
           bs->pos++;
           return data;
   }
   
   /*
    * Read a null-terminated string from stream into a buffer; buf_size is size
    * of the buffer, including the final \0. Returns buf pointer or NULL if
    * garbage input.
    */
   char*
   bs_read_str(bin_stream_t * bs, char *buf, unsigned buf_size)
   {
           unsigned        len = 0;
           char           *work_buf = buf;
           if (buf == NULL || buf_size < 1)
                   return NULL;
           do {
                   *work_buf = *(bs->data + bs->pos + len);
           } while (len++ < buf_size - 1 && *(work_buf++) != '\0');
           *(buf + buf_size - 1) = '\0';
           bs->pos += len;
           return buf;
   }
   
   /* Read an arbitrary buffer. */
   void
   bs_read_buf(bin_stream_t * bs, char *buf, unsigned buf_size)
   {
           unsigned        i;
           for (i = 0; i < buf_size; i++)
                   *(buf + i) = *(bs->data + bs->pos + i);
           bs->pos += buf_size;
   }
   
   /* Read a 16bit uint & return it */
   uint16_t
   bs_read_u16(bin_stream_t * bs)
   {
           uint16_t        data = le16dec(bs->data + bs->pos);
           bs->pos += 2;
           return data;
   }
   
   /* Read a 32bit uint & return it */
   uint32_t
   bs_read_u32(bin_stream_t * bs)
   {
           uint32_t        data = le32dec(bs->data + bs->pos);
           bs->pos += 4;
           return data;
   }
   
   /* Read a 64bit uint & return it */
   uint64_t
   bs_read_u64(bin_stream_t * bs)
   {
           uint64_t        data = le64dec(bs->data + bs->pos);
           bs->pos += 8;
           return data;
   }

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