f854db0bf5
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
/*-
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* Copyright (c) 2005 Ivan Voras <ivoras@gmail.com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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// $Id: binstream.c,v 1.1 2006/07/05 10:47:54 ivoras Exp $
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/endian.h>
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#include <sys/param.h>
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#include <geom/virstor/binstream.h>
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/* "Open" a binary stream for reading */
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void
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bs_open(bin_stream_t * bs, void *data)
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{
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bs->data = (char *)data;
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bs->pos = 0;
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}
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/* "Reset" position in binary stream to zero */
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void
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bs_reset(bin_stream_t * bs)
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{
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bs->pos = 0;
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}
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/* Write a zero-terminated string; return next position */
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unsigned
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bs_write_str(bin_stream_t * bs, char *data)
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{
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int len = 0;
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do {
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*(bs->data + bs->pos + len) = *data;
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len++;
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} while (*(data++) != '\0');
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bs->pos += len;
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return bs->pos;
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}
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/* Write an arbitrary buffer; return next position */
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unsigned
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bs_write_buf(bin_stream_t * bs, char *data, unsigned data_size)
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{
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unsigned i;
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for (i = 0; i < data_size; i++)
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*(bs->data + bs->pos + i) = *(data + i);
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bs->pos += data_size;
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return bs->pos;
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}
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/* Write a 8bit uint; return next position. */
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unsigned
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bs_write_u8(bin_stream_t * bs, uint8_t data)
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{
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*((uint8_t *) (bs->data + bs->pos)) = data;
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return ++(bs->pos);
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}
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/* Write a 16bit uint; return next position. */
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unsigned
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bs_write_u16(bin_stream_t * bs, uint16_t data)
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{
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le16enc(bs->data + bs->pos, data);
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return (bs->pos += 2);
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}
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/* Write a 32bit uint; return next position. */
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unsigned
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bs_write_u32(bin_stream_t * bs, uint32_t data)
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{
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le32enc(bs->data + bs->pos, data);
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return (bs->pos += 4);
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}
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/* Write a 64bit uint; return next position. */
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unsigned
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bs_write_u64(bin_stream_t * bs, uint64_t data)
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{
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le64enc(bs->data + bs->pos, data);
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return (bs->pos += 8);
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}
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/* Read a 8bit uint & return it */
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uint8_t
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bs_read_u8(bin_stream_t * bs)
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{
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uint8_t data = *((uint8_t *) (bs->data + bs->pos));
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bs->pos++;
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return data;
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}
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/*
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* Read a null-terminated string from stream into a buffer; buf_size is size
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* of the buffer, including the final \0. Returns buf pointer or NULL if
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* garbage input.
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*/
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char*
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bs_read_str(bin_stream_t * bs, char *buf, unsigned buf_size)
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{
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unsigned len = 0;
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char *work_buf = buf;
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if (buf == NULL || buf_size < 1)
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return NULL;
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do {
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*work_buf = *(bs->data + bs->pos + len);
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} while (len++ < buf_size - 1 && *(work_buf++) != '\0');
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*(buf + buf_size - 1) = '\0';
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bs->pos += len;
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return buf;
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}
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/* Read an arbitrary buffer. */
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void
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bs_read_buf(bin_stream_t * bs, char *buf, unsigned buf_size)
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{
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unsigned i;
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for (i = 0; i < buf_size; i++)
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*(buf + i) = *(bs->data + bs->pos + i);
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bs->pos += buf_size;
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}
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/* Read a 16bit uint & return it */
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uint16_t
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bs_read_u16(bin_stream_t * bs)
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{
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uint16_t data = le16dec(bs->data + bs->pos);
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bs->pos += 2;
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return data;
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}
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/* Read a 32bit uint & return it */
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uint32_t
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bs_read_u32(bin_stream_t * bs)
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{
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uint32_t data = le32dec(bs->data + bs->pos);
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bs->pos += 4;
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return data;
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}
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/* Read a 64bit uint & return it */
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uint64_t
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bs_read_u64(bin_stream_t * bs)
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{
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uint64_t data = le64dec(bs->data + bs->pos);
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bs->pos += 8;
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return data;
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}
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