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/*= -*- c-basic-offset: 4; indent-tabs-mode: nil; -*-
*
* librsync -- dynamic caching and delta update in HTTP
*
* Copyright (C) 2000, 2001, 2004 by Martin Pool <mbp@sourcefrog.net>
*
* 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.
*/
/*
* TODO: Pluggable encoding formats:
*
* - gdiff-style
* - rsync 24
* - ed (text)
* - Delta HTTP
*/
#include <config.h>
#include <assert.h>
#include <stdlib.h>
#include <stdio.h>
#include "librsync.h"
#include "command.h"
#include "trace.h"
#include "emit.h"
#include "prototab.h"
#include "netint.h"
#include "sumset.h"
#include "job.h"
/*
* Write the magic for the start of a delta.
*/
void
rs_emit_delta_header(rs_job_t *job)
{
rs_trace("emit DELTA magic");
rs_squirt_n4(job, RS_DELTA_MAGIC);
}
/* Write a LITERAL command. */
void
rs_emit_literal_cmd(rs_job_t *job, int len)
{
int cmd;
int param_len;
switch (param_len = rs_int_len(len)) {
case 1:
cmd = RS_OP_LITERAL_N1;
break;
case 2:
cmd = RS_OP_LITERAL_N2;
break;
case 4:
cmd = RS_OP_LITERAL_N4;
break;
default:
rs_fatal("What?");
}
rs_trace("emit LITERAL_N%d(len=%d), cmd_byte=%#x", param_len, len, cmd);
rs_squirt_byte(job, cmd);
rs_squirt_netint(job, len, param_len);
job->stats.lit_cmds++;
job->stats.lit_bytes += len;
job->stats.lit_cmdbytes += 1 + param_len;
}
/** Write a COPY command for given offset and length.
*
* There is a choice of variable-length encodings, depending on the
* size of representation for the parameters. */
void
rs_emit_copy_cmd(rs_job_t *job, rs_long_t where, rs_long_t len)
{
int cmd;
rs_stats_t *stats = &job->stats;
const int where_bytes = rs_int_len(where);
const int len_bytes = rs_int_len(len);
/* Commands ascend (1,1), (1,2), ... (8, 8) */
if (where_bytes == 8)
cmd = RS_OP_COPY_N8_N1;
else if (where_bytes == 4)
cmd = RS_OP_COPY_N4_N1;
else if (where_bytes == 2)
cmd = RS_OP_COPY_N2_N1;
else if (where_bytes == 1)
cmd = RS_OP_COPY_N1_N1;
else {
rs_fatal("can't encode copy command with where_bytes=%d",
where_bytes);
}
if (len_bytes == 1)
;
else if (len_bytes == 2)
cmd += 1;
else if (len_bytes == 4)
cmd += 2;
else if (len_bytes == 8)
cmd += 3;
else {
rs_fatal("can't encode copy command with len_bytes=%d",
len_bytes);
}
rs_trace("emit COPY_N%d_N%d(where=" PRINTF_FORMAT_U64
", len=" PRINTF_FORMAT_U64 "), cmd_byte=%#x",
where_bytes, len_bytes, PRINTF_CAST_U64(where), PRINTF_CAST_U64(len), cmd);
rs_squirt_byte(job, cmd);
rs_squirt_netint(job, where, where_bytes);
rs_squirt_netint(job, len, len_bytes);
stats->copy_cmds++;
stats->copy_bytes += len;
stats->copy_cmdbytes += 1 + where_bytes + len_bytes;
/* TODO: All the stats */
}
/** Write an END command. */
void
rs_emit_end_cmd(rs_job_t *job)
{
int cmd = RS_OP_END;
rs_trace("emit END, cmd_byte=%#x", cmd);
rs_squirt_byte(job, cmd);
}
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