static int
walkAtomicVar(NCD4meta* compiler, NCD4node* topvar, NCD4node* var, void** offsetp)
{
int ret = NC_NOERR;
void* offset;
d4size_t i;
nc_type subsort;
d4size_t dimproduct;
NCD4node* basetype;
basetype = (var->sort == NCD4_TYPE ? var : var->basetype);
subsort = basetype->subsort;
dimproduct = (var->sort == NCD4_TYPE ? 1 : NCD4_dimproduct(var));
offset = *offsetp;
if(subsort == NC_ENUM)
subsort = var->basetype->basetype->subsort;
/* Only need to swap multi-byte integers and floats */
if(subsort != NC_STRING) {
int typesize = NCD4_typesize(subsort);
d4size_t totalsize = typesize*dimproduct;
if(typesize == 1) {
offset = INCR(offset,totalsize);
} else { /*(typesize > 1)*/
for(i=0;i<dimproduct;i++) {
char* sp = (char*)offset;
if(compiler->swap) {
switch (typesize) {
case 2: swapinline16(sp); break;
case 4: swapinline32(sp); break;
case 8: swapinline64(sp); break;
default: break;
}
}
offset = INCR(offset,typesize);
}
}
} else if(subsort == NC_STRING) { /* remaining case; just convert the counts */
COUNTERTYPE count;
for(i=0;i<dimproduct;i++) {
/* Get string count */
if(compiler->swap)
swapinline64(offset);
count = GETCOUNTER(offset);
SKIPCOUNTER(offset);
/* skip count bytes */
offset = INCR(offset,count);
}
}
*offsetp = offset;
return THROW(ret);
}
/*
Remember that the base type of var is a vlen.
*/
static int
walkSeq(NCD4meta* compiler, NCD4node* topvar, NCD4node* vlentype, void** offsetp)
{
int ret = NC_NOERR;
int i;
void* offset;
d4size_t recordcount;
NCD4node* basetype;
offset = *offsetp;
/* process the record count */
recordcount = GETCOUNTER(offset);
SKIPCOUNTER(offset);
if(compiler->swap)
swapinline64(&recordcount);
basetype = vlentype->basetype; /* This may be of any type potentially */
assert(basetype->sort == NCD4_TYPE);
for(i=0;i<recordcount;i++) {
switch(basetype->subsort) {
default: /* atomic basetype */
if((ret=walkAtomicVar(compiler,topvar,basetype,&offset))) goto done;
break;
case NC_OPAQUE:
if((ret=walkOpaqueVar(compiler,topvar,basetype,&offset))) goto done;
break;
case NC_STRUCT:
/* We can treat each record like a structure instance */
if((ret=walkStruct(compiler,topvar,basetype,&offset))) goto done;
break;
case NC_SEQ:
if((ret=walkSeq(compiler,topvar,basetype,&offset))) goto done;
break;
}
}
*offsetp = offset;
done:
return THROW(ret);
}
static int
walkOpaqueVar(NCD4meta* compiler, NCD4node* topvar, NCD4node* var, void** offsetp)
{
int ret = NC_NOERR;
void* offset;
d4size_t i;
unsigned long long count;
d4size_t dimproduct = NCD4_dimproduct(var);
dimproduct = (var->sort == NCD4_TYPE ? 1 : NCD4_dimproduct(var));
offset = *offsetp;
for(i=0;i<dimproduct;i++) {
/* Get and swap opaque count */
if(compiler->swap)
swapinline64(offset);
count = GETCOUNTER(offset);
SKIPCOUNTER(offset);
offset = INCR(offset,count);
}
*offsetp = offset;
return THROW(ret);
}
static OCerror
ocread(OCdata* data, XXDR* xdrs, char* memory, size_t memsize, size_t start, size_t count)
{
int i;
OCnode* pattern;
OCtype etype;
off_t elemsize, totalsize, xdrtotal, xdrstart;
int scalar;
OCASSERT(data != NULL);
OCASSERT(memory != NULL);
OCASSERT(memsize > 0);
OCASSERT(count > 0);
OCASSERT((start+count) <= data->ninstances);
pattern = data->pattern;
etype = pattern->etype;
scalar = (pattern->array.rank == 0);
/* Note that for strings, xdrsize == 0 */
xdrtotal = count*data->xdrsize; /* amount (in xdr sizes) to read */
xdrstart = start*data->xdrsize; /* offset from the start of the data */
elemsize = octypesize(etype); /* wrt memory, not xdrsize */
totalsize = elemsize*count;
/* validate memory space*/
if(memsize < totalsize) return OCTHROW(OC_EINVAL);
/* copy out with appropriate byte-order conversions */
switch (etype) {
case OC_Int32: case OC_UInt32: case OC_Float32:
xxdr_setpos(xdrs,data->xdroffset+xdrstart);
if(!xxdr_getbytes(xdrs,memory,xdrtotal)) {OCTHROW(OC_EDATADDS); goto xdrfail;}
if(!xxdr_network_order) {
unsigned int* p;
for(p=(unsigned int*)memory,i=0;i<count;i++,p++) {
swapinline32(p);
}
}
break;
case OC_Int64: case OC_UInt64:
xxdr_setpos(xdrs,data->xdroffset+xdrstart);
if(!xxdr_getbytes(xdrs,memory,xdrtotal)) {OCTHROW(OC_EDATADDS); goto xdrfail;}
if(!xxdr_network_order) {
unsigned long long* llp;
for(llp=(unsigned long long*)memory,i=0;i<count;i++,llp++) {
swapinline64(llp);
}
}
break;
case OC_Float64:
xxdr_setpos(xdrs,data->xdroffset+xdrstart);
if(!xxdr_getbytes(xdrs,memory,xdrtotal)) {OCTHROW(OC_EDATADDS); goto xdrfail;}
{
double* dp;
for(dp=(double*)memory,i=0;i<count;i++,dp++) {
double swap;
xxdrntohdouble((char*)dp,&swap);
*dp = swap;
}
}
break;
/* non-packed fixed length, but memory size < xdrsize */
case OC_Int16: case OC_UInt16: {
/* In order to avoid allocating a lot of space, we do this one int at a time */
/* Remember also that the short is not packed, so its xdr size is twice
its memory size */
xxdr_setpos(xdrs,data->xdroffset+xdrstart);
if(scalar) {
if(!xxdr_ushort(xdrs,(unsigned short*)memory)) {OCTHROW(OC_EDATADDS); goto xdrfail;}
} else {
unsigned short* sp = (unsigned short*)memory;
for(i=0;i<count;i++,sp++) {
unsigned int tmp;
if(!xxdr_getbytes(xdrs,(char*)&tmp,(off_t)XDRUNIT))
{OCTHROW(OC_EDATADDS); goto xdrfail;}
/* convert from network order if necessary */
if(!xxdr_network_order)
swapinline32(&tmp);
/* store as unsigned short */
*sp = (unsigned short)tmp;
}
}
} break;
/* Do the byte types, packed/unpacked */
case OC_Byte:
case OC_UByte:
case OC_Char:
if(scalar) {
/* scalar bytes are stored in xdr as int */
xxdr_setpos(xdrs,data->xdroffset+xdrstart);
if(!xxdr_uchar(xdrs,(unsigned char*)memory)) {OCTHROW(OC_EDATADDS); goto xdrfail;}
} else {
/* the xdroffset will always be at the start of the
packed data, so we need to add the start count to it */
xxdr_setpos(xdrs,data->xdroffset+xdrstart);
if(!xxdr_getbytes(xdrs,memory,xdrtotal)) {OCTHROW(OC_EDATADDS); goto xdrfail;}
}
break;
/* Hard case, because strings are variable length */
case OC_String: case OC_URL: {
/* use the data->nstrings data->string fields */
char** sp = (char**)memory;
if(count > data->nstrings)
return OCTHROW(OC_EDATADDS);
for(i=0;i<count;i++,sp++) {
off_t len;
off_t offset = data->strings[start+i];
xxdr_setpos(xdrs,offset);
/* get the string */
if(!xxdr_string(xdrs,sp,&len))
{OCTHROW(OC_EDATADDS); goto xdrfail;}
}
} break;
default: OCPANIC("unexpected etype"); break;
}
return OC_NOERR;
xdrfail:
oclog(OCLOGERR,"DAP DATADDS packet is apparently too short");
return OCTHROW(OC_EDATADDS);
}
