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/*= -*- c-basic-offset: 4; indent-tabs-mode: nil; -*-
*
* librsync -- library for network deltas
*
* Copyright (C) 1999, 2000, 2001 by Martin Pool <mbp@sourcefrog.net>
* Copyright (C) 1999 by Andrew Tridgell <tridge@samba.org>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*=
| Ummm, well, OK. The network's the
| network, the computer's the
| computer. Sorry for the confusion.
| -- Sun Microsystems
*/
/** \file netint.c
* Network-byte-order output to the tube.
*
* All the `suck' routines return a result code. The most common values are
* RS_DONE if they have enough data, or RS_BLOCKED if there is not enough input
* to proceed.
*
* The `squirt` routines also return a result code which in theory could be
* RS_BLOCKED if there is not enough output space to proceed, but in practice
* is always RS_DONE. */
#include <assert.h>
#include "librsync.h"
#include "netint.h"
#include "stream.h"
#define RS_MAX_INT_BYTES 8
/** Write a single byte to a stream output. */
rs_result rs_squirt_byte(rs_job_t *job, rs_byte_t val)
{
rs_tube_write(job, &val, 1);
return RS_DONE;
}
/** Write a variable-length integer to a stream.
*
* \param job - Job of data.
*
* \param val - Value to write out.
*
* \param len - Length of integer, in bytes. */
rs_result rs_squirt_netint(rs_job_t *job, rs_long_t val, int len)
{
rs_byte_t buf[RS_MAX_INT_BYTES];
int i;
assert(len <= RS_MAX_INT_BYTES);
/* Fill the output buffer with a bigendian representation of the number. */
for (i = len - 1; i >= 0; i--) {
buf[i] = (rs_byte_t)val; /* truncated */
val >>= 8;
}
rs_tube_write(job, buf, len);
return RS_DONE;
}
rs_result rs_squirt_n4(rs_job_t *job, int val)
{
return rs_squirt_netint(job, val, 4);
}
rs_result rs_suck_byte(rs_job_t *job, rs_byte_t *val)
{
rs_result result;
rs_byte_t *buf;
if ((result = rs_scoop_read(job, 1, (void **)&buf)) == RS_DONE)
*val = *buf;
return result;
}
rs_result rs_suck_netint(rs_job_t *job, rs_long_t *val, int len)
{
rs_result result;
rs_byte_t *buf;
int i;
assert(len <= RS_MAX_INT_BYTES);
if ((result = rs_scoop_read(job, len, (void **)&buf)) == RS_DONE) {
*val = 0;
for (i = 0; i < len; i++)
*val = (*val << 8) | (rs_long_t)buf[i];
}
return result;
}
rs_result rs_suck_n4(rs_job_t *job, int *val)
{
rs_result result;
rs_long_t buf;
if ((result = rs_suck_netint(job, &buf, 4)) == RS_DONE)
*val = (int)buf;
return result;
}
int rs_int_len(rs_long_t val)
{
assert(val >= 0);
if (!(val & ~(rs_long_t)0xff))
return 1;
if (!(val & ~(rs_long_t)0xffff))
return 2;
if (!(val & ~(rs_long_t)0xffffffff))
return 4;
assert(!(val & ~(rs_long_t)0xffffffffffffffff));
return 8;
}
|
