27bd800e61
providers with limited physical storage and add physical storage as needed. Submitted by: Ivan Voras Sponsored by: Google Summer of Code 2006 Approved by: re (kensmith)
186 lines
4.3 KiB
C
186 lines
4.3 KiB
C
/*-
|
|
* 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;
|
|
}
|