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Diffstat (limited to 'sys/geom/virstor/binstream.c')
-rw-r--r-- | sys/geom/virstor/binstream.c | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/sys/geom/virstor/binstream.c b/sys/geom/virstor/binstream.c new file mode 100644 index 0000000..bbbafdb --- /dev/null +++ b/sys/geom/virstor/binstream.c @@ -0,0 +1,185 @@ +/*- + * 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; +} |