forked from Unidata/netcdf-c
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cdfdata.c
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cdfdata.c
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/*********************************************************************
* Copyright 2018, UCAR/Unidata
* See netcdf/COPYRIGHT file for copying and redistribution conditions.
*********************************************************************/
/* $Id: cdfdata.c,v 1.4 2010/05/24 19:59:56 dmh Exp $ */
/* $Header: /upc/share/CVS/netcdf-3/ncgen/cdfdata.c,v 1.4 2010/05/24 19:59:56 dmh Exp $ */
#include "includes.h"
#include "ncoffsets.h"
#ifdef ENABLE_BINARY
/**************************************************/
/* Code for generating binary data lists*/
/**************************************************/
struct Vlendata {
char* data;
unsigned long count;
}* vlendata;
/* Forward*/
static void genbin_data(Symbol* sym, Datasrc*, Datalist*, Bytebuffer*);
static void genbin_arraydatar(Symbol* basetype,
Datasrc* src,
Odometer* odom,
int index,
int checkpoint,
Bytebuffer* code);
static void genbin_primdata(Symbol*, Datasrc*, Datalist*, Bytebuffer*);
static void genbin_fieldarray(Symbol*, Datasrc*, Dimset*, int, Bytebuffer*);
static void alignbuffer(Constant* prim, Bytebuffer* buf, int base);
static void alignto(int,ByteBuffer*, int base);
/* Datalist rules: see the rules on the man page */
/* Specialty wrappers for genbin_data */
void
genbin_attrdata(Symbol* asym, Bytebuffer* memory)
{
Datasrc* src;
int chartype = (asym->typ.basetype->typ.typecode == NC_CHAR);
if(asym->data == NULL) return;
if(chartype) {gen_charattr(asym,memory); return;}
src = datalist2src(asym->data);
while(srcmore(src)) {
genbin_data(asym->typ.basetype,src,NULL,memory);
}
}
#if 0 /* Apparently not used */
void
genbin_scalardata(Symbol* vsym, Bytebuffer* memory)
{
Datasrc* src;
if(vsym->data == NULL) return;
src = datalist2src(vsym->data);
genbin_data(vsym->typ.basetype,src,
vsym->var.special._Fillvalue,memory);
if(srcmore(src)) {
semerror(srcline(src),"Extra data at end of datalist");
}
}
*/
void
genbin_datalist(struct Symbol* sym, Datalist* list, Bytebuffer* memory)
{
Datasrc* src = datalist2src(list);
genbin_data(sym,src,NULL,memory);
}
static void
genbin_data(Symbol* tsym, Datasrc* datasrc, Datalist* fillsrc,
Bytebuffer* memory)
{
int usecmpd;
Constant* con = srcpeek(datasrc);
if(con == NULL || con->nctype == NC_FILLVALUE) {
srcnext(datasrc);
genbin_fillvalue(tsym,fillsrc,datasrc,memory);
return;
}
switch (tsym->subclass) {
case NC_ENUM:
case NC_OPAQUE:
case NC_PRIM:
if(issublist(datasrc)) {
semerror(srcline(datasrc),"Expected primitive found {..}");
}
genbin_primdata(tsym,datasrc,fillsrc,memory);
break;
case NC_COMPOUND:
genbin_compound(tsym,datasrc,fillsrc,memory);
break;
case NC_VLEN: {
Constant* cp;
nc_vlen_t ptr;
if(!issublist(datasrc)) {
semerror(srcline(datasrc),"Vlen data must be enclosed in {..}");
}
cp = srcnext(datasrc);
/* generate the nc_vlen_t instance*/
ptr.p = vlendata[cp->value.compoundv->vlen.uid].data;
ptr.len = vlendata[cp->value.compoundv->vlen.uid].count;
bbAppendn(memory,(char*)&ptr,sizeof(ptr));
} break;
case NC_FIELD:
/* enclose in braces if and only if field is an array */
usecmpd = (issublist(datasrc) && tsym->typ.dimset.ndims > 0);
if(usecmpd) srcpush(datasrc);
if(tsym->typ.dimset.ndims > 0) {
genbin_fieldarray(tsym->typ.basetype,datasrc,&tsym->typ.dimset,0,memory);
} else {
genbin_data(tsym->typ.basetype,datasrc,NULL,memory);
}
if(usecmpd) srcpop(datasrc);
break;
default: PANIC1("genbin_data: unexpected subclass %d",tsym->subclass);
}
}
/* Used for compound instances */
static void
genbin_compound(Symbol* tsym, Datasrc* datasrc, Datalist* fillsrc, Bytebuffer* memory)
{
int i;
int base = bblength(memory);
if(!issublist(datasrc)) {
semerror(srcline(datasrc),"Compound data must be enclosed in {..}");
}
/* Use this datasrc list to get values for compound fields */
srcpush(datasrc);
for(i=0;i<listlength(tsym->subnodes);i++) {
Symbol* field = (Symbol*)listget(tsym->subnodes,i);
if(!srcmore(datasrc)) { /* generate a fill value*/
Datalist* fillsrc = getfiller(tsym);
genbin_data(field,datasrc,fillsrc,memory);
} else
genbin_data(field,datasrc,NULL,memory);
}
srcpop(datasrc);
/* Re: github issue 323: we may need to pad the end of the structure
to make its size be a multiple of the largest alignment.
*/
alignto(tsym->cmpdalignment,buf,base);
}
/* Used only for structure field arrays*/
static void
genbin_fieldarray(Symbol* basetype, Datasrc* src, Dimset* dimset, int index,
Bytebuffer* memory)
{
int i;
Symbol* dim = dimset->dimsyms[index];
unsigned int size = dim->dim.size;
int lastdim = (index == (dimset->ndims - 1)); /* last dimension*/
int chartype = (basetype->typ.typecode == NC_CHAR);
if(chartype) {
/* Collect the char field in a separate buffer */
Bytebuffer* fieldbuf = bbNew();
gen_charfield(src,dimset,index,fieldbuf);
bbAppendn(memory,bbContents(fieldbuf),bbLength(fieldbuf));
bbFree(fieldbuf);
} else {
ASSERT(size != 0);
for(i=0;i<size;i++) {
if(lastdim) {
genbin_data(basetype,src,NULL,memory);
} else { /* !lastdim*/
genbin_fieldarray(basetype,src,dimset,index+1,memory);
}
}
}
}
static void
genbin_primdata(Symbol* basetype, Datasrc* src, Datalist* fillsrc,
Bytebuffer* memory)
{
Constant* prim;
Constant target;
prim = srcnext(src);
if(prim == NULL || prim->nctype == NC_FILLVALUE) {
genbin_fillvalue(basetype,fillsrc,src,memory);
return;
}
target.nctype = basetype->typ.typecode;
if(prim == NULL) {
#ifdef GENFILL
/* generate a fill value*/
nc_getfill(&target);
/* fall thru*/
#else
return;
#endif
}
ASSERT(prim->nctype != NC_COMPOUND);
if(target.nctype != NC_ECONST) {
convert1(prim,&target);
alignbuffer(&target,memory);
}
switch (target.nctype) {
case NC_ECONST:
if(basetype->subclass != NC_ENUM) {
semerror(prim->lineno,"Conversion to enum not supported (yet)");
} else {
Datalist* econ = builddatalist(1);
srcpushlist(src,econ);
dlappend(econ,&prim->value.enumv->typ.econst);
genbin_primdata(prim->value.enumv->typ.basetype,src,
fillsrc,memory);
srcpop(src);
}
break;
case NC_OPAQUE: {
unsigned char* bytes;
size_t len;
setprimlength(&target,basetype->typ.size*2);
bytes=makebytestring(target.value.opaquev.stringv,&len);
bbAppendn(memory,(void*)bytes,len);
} break;
case NC_CHAR:
bbAppendn(memory,&target.value.charv,sizeof(target.value.charv));
break;
case NC_BYTE:
bbAppendn(memory,(void*)&target.value.int8v,sizeof(target.value.int8v));
break;
case NC_SHORT:
bbAppendn(memory,(void*)&target.value.int16v,sizeof(target.value.int16v));
break;
case NC_INT:
bbAppendn(memory,(void*)&target.value.int32v,sizeof(target.value.int32v));
break;
case NC_FLOAT:
bbAppendn(memory,(void*)&target.value.floatv,sizeof(target.value.floatv));
break;
case NC_DOUBLE:
bbAppendn(memory,(void*)&target.value.doublev,sizeof(target.value.doublev));
break;
case NC_UBYTE:
bbAppendn(memory,(void*)&target.value.uint8v,sizeof(target.value.uint8v));
break;
case NC_USHORT:
bbAppendn(memory,(void*)&target.value.uint16v,sizeof(target.value.uint16v));
break;
case NC_UINT:
bbAppendn(memory,(void*)&target.value.uint32v,sizeof(target.value.uint32v));
break;
case NC_INT64: {
union SI64 { char ch[8]; long long i64;} si64;
si64.i64 = target.value.int64v;
bbAppendn(memory,(void*)si64.ch,sizeof(si64.ch));
} break;
case NC_UINT64: {
union SU64 { char ch[8]; unsigned long long i64;} su64;
su64.i64 = target.value.uint64v;
bbAppendn(memory,(void*)su64.ch,sizeof(su64.ch));
} break;
case NC_STRING: {
if(usingclassic) {
bbAppendn(memory,target.value.stringv.stringv,target.value.stringv.len);
} else if(target.nctype == NC_CHAR) {
bbAppendn(memory,target.value.stringv.stringv,target.value.stringv.len);
} else {
char* ptr;
int len = (size_t)target.value.stringv.len;
ptr = poolalloc(len+1); /* CAREFUL: this has short lifetime*/
memcpy(ptr,target.value.stringv.stringv,len);
ptr[len] = '\0';
bbAppendn(memory,(void*)&ptr,sizeof(ptr));
}
} break;
default: PANIC1("genbin_primdata: unexpected type: %d",target.nctype);
}
}
void
genbin_fillvalue(Symbol* tsym, Datalist* fillsrc, Datasrc* src,
Bytebuffer* memory)
{
Datalist* list = NULL;
ASSERT(tsym->objectclass == NC_TYPE);
list = fillsrc;
if(list == NULL) list = getfiller(tsym);
srcpushlist(src,list);
genbin_data(tsym,src,NULL,memory);
srcpop(src);
}
/*
This walk of the data lists collects
vlen sublists and constructs separate C constants
for each of them. The "id" of each list is then
recorded in the containing datalist.
*/
void
genbin_vlenconstants(List* vlenconstants)
{
int i,nvlen;
Datasrc* vlensrc;
Bytebuffer* memory = bbNew();
/* Prepare a place to store vlen constants */
nvlen = listlength(vlenconstants);
if(nvlen == 0) return;
vlendata = (struct Vlendata*)ecalloc(sizeof(struct Vlendata)*nvlen+1);
memset((void*)vlendata,0,sizeof(struct Vlendata)*nvlen+1);
for(i=0;i<nvlen;i++) {
Constant* cmpd = (Constant*)listget(vlenconstants,i);
int chartype;
Symbol* tsym = cmpd->value.compoundv->vlen.schema;
unsigned long uid = cmpd->value.compoundv->vlen.uid;
unsigned long count;
ASSERT(tsym != NULL);
chartype = (tsym->typ.basetype->typ.typecode == NC_CHAR);
vlensrc = datalist2src(cmpd->value.compoundv);
bbClear(memory);
count = 0;
if(chartype) {
/* Collect the char sequence in a separate buffer */
gen_charseq(vlensrc,memory);
count = bbLength(memory);
} else {
while(srcmore(vlensrc)) {
genbin_data(tsym->typ.basetype,vlensrc,NULL,memory);
count++;
}
ASSERT(count == cmpd->value.compoundv->vlen.count);
}
vlendata[uid].data = bbDup(memory);
vlendata[uid].count = count;
}
bbFree(memory);
}
void
genbin_arraydata(Symbol* vsym, Bytebuffer* memory)
{
Datasrc* src;
Datalist* list;
int i;
int chartype = (vsym->typ.basetype->typ.typecode == NC_CHAR);
nciter_t iter;
Iterodom iterodom;
if(vsym->data == NULL) return;
if(chartype) {
gen_chararray(vsym,memory);
return;
}
list = vsym->data;
ASSERT(list->dimdata != NULL);
src = datalist2src(list);
/* Create an iterator to generate blocks of data */
nc_get_iter(vsym,databuffersize,&iter);
nc_next_iter(&iter,iterodom.start,iterodom.count);
iterodom.rank = vsym->typ.dimset.ndims;
genbin_arraydatar(vsym,memory,src,iter,&iterodom,/*index=*/0)
}
static void
genbin_arraydatar(Symbol* vsym,
Bytebuffer* memory,
nciter_t iter,
Iterodom* iterodom,
int index)
{
int i;
int rank = iterodom->rank;
int lastdim = (index == (rank - 1)); /* last dimension*/
int firstdim = (index == 0);
int declsize = odom->dims[index].declsize;
int isunlimited = (declsize == 0);
Symbol* basetype = vsym->typ.basetype;
Datalist* fillsrc = vsym->var.special._Fillvalue;
Constant* con;
ASSERT(index >= 0 && index < rank);
odom->dims[index].index = 0; /* reset*/
if(isunlimited) {
Constant* con;
if(!firstdim) {
if(!issublist(src)) {
semerror(srcline(src),"Unlimited data must be enclosed in {..}");
return;
}
srcpush(src); /* enter the unlimited data */
}
while((con=srcpeek(src))!=NULL) {
if(lastdim) {
genbin_data(basetype,src,fillsrc,memory);
} else {
genbin_arraydatar(vsym,src,odom,index+1,
checkpoint,memory);
}
odom->dims[index].index++;
if(docheckpoint) {
closure->putvar(closure,odom,memory);
}
}
odom->dims[index].datasize = odom->dims[index].index;
if(!firstdim) srcpop(src);
} else { /* !isunlimited*/
for(i=0;i<declsize;i++) {
con = srcpeek(src);
if(lastdim) {
genbin_data(basetype,src,fillsrc,memory);
} else { /* ! lastdim*/
(void)genbin_arraydatar(vsym,src,odom,
index+1,checkpoint,memory);
}
odom->dims[index].index++;
if(docheckpoint) {
closure->putvar(closure,odom,memory);
}
}
}
}
static void
alignbuffer(Constant* prim, Bytebuffer* buf, int base
{
int alignment,pad,offset;
if(prim->nctype == NC_ECONST)
alignment = nctypealignment(prim->value.enumv->typ.typecode);
else if(usingclassic && prim->nctype == NC_STRING)
alignment = nctypealignment(NC_CHAR);
else if(prim->nctype == NC_CHAR)
alignment = nctypealignment(NC_CHAR);
else
alignment = nctypealignment(prim->nctype);
alignto(alignment,buf,base);
}
static const char zeros[] =
"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0";
static void
alignto(int alignment, Bytebuffer* buf, int base)
{
offset = bbLength(buf);
offset -= base; /* Need to actually align wrt to the base */
pad = getpadding(offset,alignment);
if(pad > 0) {
bbAppendn(buf,(void*)zeros,pad);
}
}
#endif /*ENABLE_BINARY*/