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/*
acsserialize.c: Serialize an ACS into a block of working memory.
Authors: Andrew Jenkins, Sebastian Kuzminsky,
University of Colorado at Boulder
Copyright (c) 2008-2011, Regents of the University of Colorado.
This work was supported by NASA contracts NNJ05HE10G, NNC06CB40C, and
NNC07CB47C.
*/
#include "acsP.h"
/* FIXME: Can this go in sdrlist? */
static void sdr_list_foreach(Sdr sdr, Object list,
void (*callback)(Sdr, Object, void *), void *args)
{
Object listElt;
Object listData;
for(listElt = sdr_list_first(sdr, list);
listElt;
listElt = sdr_list_next(sdr, listElt))
{
listData = sdr_list_data(sdr, listElt);
callback(sdr, listData, args);
}
}
typedef struct {
unsigned char *buf;
unsigned long iBuf;
unsigned long bufSize;
unsigned long lastFill;
} SerializeForeachArgs_t;
static void serializeFill(Sdr sdr, Object fillAddr, void *argsAsVoid)
{
SerializeForeachArgs_t *args = (SerializeForeachArgs_t *)(argsAsVoid);
SdrAcsFill fill;
Sdnv encoded;
assert(sdr_in_xn(sdr));
sdr_peek(sdr, fill, fillAddr);
/* Write a start-delta. */
encodeSdnv(&encoded, fill.start - args->lastFill);
memcpy(args->buf + args->iBuf, encoded.text, encoded.length);
args->iBuf += encoded.length;
assert(args->bufSize >= args->iBuf);
/* Write a length. */
encodeSdnv(&encoded, fill.length);
memcpy(args->buf + args->iBuf, encoded.text, encoded.length);
args->iBuf += encoded.length;
assert(args->bufSize >= args->iBuf);
args->lastFill = fill.start + fill.length - 1;
}
unsigned long serializeAcs(Object signalAddr, Object *serializedZco,
unsigned long lastSerializedSize)
{
SdrAcsSignal signal;
SerializeForeachArgs_t args;
Object serializedSdrAddr;
Object serializedZcoAddr;
Sdr bpSdr = getIonsdr();
Sdr acsSdr = getAcssdr();
/* We rely on incremental updates (reserialization) to serializedZco
* to determine the right size of buffer to allocate:
* - If there is no existing serializedZco, then there is no more
* than one signal in the list, so the maximum size of buf is known.
*
* - If there is an existing serializedZco, then we are adding at most
* one more fill to the serialization, so the maximum increase in
* size of buf is known.
*
* This calculation is pessimistic, but it's just our working memory;
* we actually allocate a ZCO of the exact right size after we're done
* serializing. */
if (lastSerializedSize == 0)
{
args.bufSize = 1 /* Admin Record header byte */
+ 1 /* reasonCode, succeeded byte */
+ 20; /* 1 start, length SDNV double */
} else {
args.bufSize = lastSerializedSize
+ 20; /* Possibly new start, length SDNV double. */
}
if((args.buf = MTAKE(args.bufSize)) == 0)
{
putErrmsg("Can't allocate for ACS serialization", itoa(args.bufSize));
return 0;
}
args.iBuf = 0;
ASSERT_BPSDR_XN;
ASSERT_ACSSDR_XN;
sdr_peek(acsSdr, signal, signalAddr);
/* Assign the admin record header byte. */
args.buf[args.iBuf] = (BP_AGGREGATE_CUSTODY_SIGNAL << 4) | 0x00;
args.iBuf++;
assert(args.bufSize >= args.iBuf);
/* Assign the status byte. */
args.buf[args.iBuf] = (signal.succeeded << 7) | (signal.reasonCode & 0x7F);
args.iBuf++;
assert(args.bufSize >= args.iBuf);
/* Serialize the acsFills. */
args.lastFill = 0;
sdr_list_foreach(acsSdr, signal.acsFills, serializeFill, &args);
serializedSdrAddr = sdr_malloc(bpSdr, args.iBuf);
if (serializedSdrAddr == 0)
{
putErrmsg("Can't sdr_malloc() ACS payload", itoa(args.iBuf));
MRELEASE(args.buf);
return 0;
}
sdr_write(bpSdr, serializedSdrAddr, (char *)(args.buf), args.iBuf);
MRELEASE(args.buf);
serializedZcoAddr = zco_create(bpSdr, ZcoSdrSource,
serializedSdrAddr, 0, args.iBuf);
if (serializedZcoAddr == (Object) ERROR || serializedZcoAddr == 0)
{
putErrmsg("Can't put ACS payload into a ZCO", itoa(serializedZcoAddr));
return 0;
}
/* Assign output args and return. */
*serializedZco = serializedZcoAddr;
return args.iBuf;
}
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