/** 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 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;
}