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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.
*/
/** \file emit.c
* encoding output routines.
*
* \todo Pluggable encoding formats: gdiff-style, rsync 24, ed (text), Delta
* HTTP. */
#include <assert.h>
#include "librsync.h"
#include "emit.h"
#include "job.h"
#include "netint.h"
#include "prototab.h"
#include "trace.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 = len <= 64 ? 0 : rs_int_len(len);
if (param_len == 0) {
cmd = len;
rs_trace("emit LITERAL_%d, cmd_byte=%#04x", len, cmd);
} else if (param_len == 1) {
cmd = RS_OP_LITERAL_N1;
rs_trace("emit LITERAL_N1(len=%d), cmd_byte=%#04x", len, cmd);
} else if (param_len == 2) {
cmd = RS_OP_LITERAL_N2;
rs_trace("emit LITERAL_N2(len=%d), cmd_byte=%#04x", len, cmd);
} else {
assert(param_len == 4);
cmd = RS_OP_LITERAL_N4;
rs_trace("emit LITERAL_N4(len=%d), cmd_byte=%#04x", len, cmd);
}
rs_squirt_byte(job, (rs_byte_t)cmd);
if (param_len)
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 {
assert(where_bytes == 1);
cmd = RS_OP_COPY_N1_N1;
}
if (len_bytes == 1) ;
else if (len_bytes == 2)
cmd += 1;
else if (len_bytes == 4)
cmd += 2;
else {
assert(len_bytes == 8);
cmd += 3;
}
rs_trace("emit COPY_N%d_N%d(where=" FMT_LONG ", len=" FMT_LONG
"), cmd_byte=%#04x", where_bytes, len_bytes, where, len, cmd);
rs_squirt_byte(job, (rs_byte_t)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;
}
/** Write an END command. */
void rs_emit_end_cmd(rs_job_t *job)
{
int cmd = RS_OP_END;
rs_trace("emit END, cmd_byte=%#04x", cmd);
rs_squirt_byte(job, (rs_byte_t)cmd);
}
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