forked from Unidata/netcdf-c
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d4fix.c
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d4fix.c
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/*********************************************************************
* Copyright 2016, UCAR/Unidata
* See netcdf/COPYRIGHT file for copying and redistribution conditions.
*********************************************************************/
#include <stdarg.h>
#include <assert.h>
#include "d4includes.h"
#include "ezxml.h"
/*
The primary purpose of this code is to provide node and data walkers
to do a variety of things.
* (topo)
a. topologically sort the set of allnodes in postfix order.
* (delimit)
a. Delimit the top-level vars in the dap4data and also compute checksum
* (move)
a. Walk the (toplevel) var's data to get to the count'th instance.
*/
/**************************************************/
#define COUNTSIZE 8
/**************************************************/
/* Forward */
static int delimitAtomicVar(NCD4meta*, NCD4node* var, void** offsetp);
static int delimitOpaqueVar(NCD4meta*, NCD4node* var, void** offsetp);
static int delimitSeq(NCD4meta*, NCD4node* var, void** offsetp);
static int delimitSeqArray(NCD4meta*, NCD4node* var, void** offsetp);
static int delimitStruct(NCD4meta*, NCD4node* var, void** offsetp);
static int delimitStructArray(NCD4meta*, NCD4node* var, void** offsetp);
static int skipInstance(NCD4meta*, NCD4node* type, void** offsetp);
static int skipAtomicInstance(NCD4meta*, NCD4node* type, void** offsetp);
static int skipStructInstance(NCD4meta*, NCD4node* type, void** offsetp);
static int skipSeqInstance(NCD4meta*, NCD4node* vlentype, void** offsetp);
static void walk(NCD4node* node, NClist* sorted);
#ifdef D4DEBUGDATA
static void
ADDNODE(NClist* list, NCD4node* node)
{
fprintf(stderr,"addnode: %s: %s %s (%llu)\n",
node->name,
NCD4_sortname(node->sort),
NCD4_subsortname(node->subsort),
node);
fflush(stderr);
nclistpush(list,node);
}
#else
#define ADDNODE(list,node) nclistpush((list),(node))
#endif
/**************************************************/
/* Topo sort in postfix order */
int
NCD4_toposort(NCD4meta* compiler)
{
int i, ret=NC_NOERR;
size_t len = nclistlength(compiler->allnodes);
NCD4node** list = (NCD4node**)nclistcontents(compiler->allnodes);
NCD4node** p;
NClist* sorted = nclistnew();
nclistsetalloc(sorted,len);
for(i=0,p=list;i<len;p++,i++) {
NCD4node* node = *p;
switch (node->sort) { /* Collect things known to have no dependencies */
case NCD4_DIM:
node->visited = 1;
ADDNODE(sorted,node);
break;
case NCD4_TYPE:
if(node->subsort <= NC_MAX_ATOMIC_TYPE || node->subsort == NC_OPAQUE) {
node->visited = 1;
ADDNODE(sorted,node);
} else
node->visited = 0;
break;
default:
node->visited = 0;
}
}
walk(compiler->root,sorted);
/* Last step is to add in any remaining unvisited nodes, but report them */
for(i=0,p=list;i<len;p++,i++) {
NCD4node* node = *p;
if(node->visited) continue;
#ifdef D4DEBUGDATA
fprintf(stderr,"unvisited node: %s\n",node->name); fflush(stderr);
#endif
node->visited = 1;
ADDNODE(sorted,node);
}
nclistfree(compiler->allnodes);
compiler->allnodes = sorted;
#ifdef D4DEBUGDATA
{int i;
for(i=0;i<nclistlength(sorted);i++)
fprintf(stderr,"sorted: %s\n",((NCD4node*)nclistget(sorted,i))->name);
fflush(stderr);
}
#endif
return THROW(ret);
}
/*
Do depth first search
*/
static void
walk(NCD4node* node, NClist* sorted)
{
int i;
if(node->visited) return;
node->visited = 1;
switch (node->sort) {
case NCD4_GROUP: /* depends on its elements and attributes and subgroups */
for(i=0;i<nclistlength(node->group.elements);i++) {
NCD4node* elem = (NCD4node*)nclistget(node->group.elements,i);
walk(elem,sorted);
}
break;
case NCD4_TYPE: /* Need to discriminate on the subsort */
switch (node->subsort) {
case NC_SEQ:
/* Depends on its basetype */
walk(node->basetype,sorted);
break;
case NC_STRUCT: /* Depends on its fields */
for(i=0;i<nclistlength(node->vars);i++) {
NCD4node* f = (NCD4node*)nclistget(node->vars,i);
walk(f,sorted);
}
break;
case NC_ENUM: /* Depends on its basetype, but since that is atomic, we can ignore */
/* fall thru */
default: /* Atomic or opaque, so already marked */
break;
}
break;
case NCD4_VAR: /* Depends on: dimensions and basetype and maps */
for(i=0;i<nclistlength(node->dims);i++) {
NCD4node* d = (NCD4node*)nclistget(node->dims,i);
walk(d,sorted);
}
walk(node->basetype,sorted);
for(i=0;i<nclistlength(node->maps);i++) {
NCD4node* m = (NCD4node*)nclistget(node->maps,i);
walk(m,sorted);
}
break;
case NCD4_ATTR: /* Depends on its base type */
walk(node->basetype,sorted);
break;
case NCD4_ATTRSET: /* Depends on its contained attributes, but handled after switch */
/* fall thru */
default: /* depends on nothing else */
break;
}
/* Do Attributes last */
for(i=0;i<nclistlength(node->attributes);i++) {
NCD4node* a = (NCD4node*)nclistget(node->attributes,i);
walk(a,sorted);
}
ADDNODE(sorted,node);
}
/**************************************************/
/* Mark the offset and length of each var/field
inside the raw dapdata.
Assumes it is called before byte swapping, so we
need to do swapping of counts and the final remote checksum.
*/
int
NCD4_delimit(NCD4meta* compiler, NCD4node* topvar, void** offsetp)
{
int ret = NC_NOERR;
void* offset;
offset = *offsetp;
ASSERT((ISTOPLEVEL(topvar)));
topvar->data.dap4data.memory = offset;
if(topvar->sort == NCD4_VAR) {
switch (topvar->subsort) {
case NC_STRUCT:
if((ret=delimitStructArray(compiler,topvar,&offset))) goto done;
break;
case NC_SEQ:
if((ret=delimitSeqArray(compiler,topvar,&offset))) goto done;
break;
default:
if((ret=delimitAtomicVar(compiler,topvar,&offset))) goto done;
break;
}
}
/* Track the variable size (in the dap4 data) but do not include
any checksum */
topvar->data.dap4data.size = (d4size_t)(((char*)offset) - ((char*)*offsetp));
/* extract the dap4 data checksum, if present */
if(compiler->serial.remotechecksumming) {
union ATOMICS csum;
memcpy(csum.u8,offset,CHECKSUMSIZE);
topvar->data.remotechecksum = csum.u32[0];
if(compiler->swap) swapinline32(&topvar->data.remotechecksum);
offset = INCR(offset,CHECKSUMSIZE);
}
*offsetp = offset;
done:
return THROW(ret);
}
/* Includes opaque and enum */
static int
delimitAtomicVar(NCD4meta* compiler, NCD4node* var, void** offsetp)
{
int ret = NC_NOERR;
void* offset;
int typesize;
d4size_t i;
d4size_t dimproduct;
nc_type tid;
NCD4node* basetype;
NCD4node* truetype;
assert(var->sort == NCD4_VAR);
dimproduct = NCD4_dimproduct(var);
basetype = var->basetype;
if(basetype->subsort == NC_OPAQUE)
return delimitOpaqueVar(compiler,var,offsetp);
truetype = basetype;
if(truetype->subsort == NC_ENUM)
truetype = basetype->basetype;
offset = *offsetp;
tid = truetype->subsort;
typesize = NCD4_typesize(tid);
if(tid != NC_STRING) {
offset = INCR(offset,(typesize*dimproduct));
} else if(tid == NC_STRING) { /* walk the counts */
unsigned long long count;
for(i=0;i<dimproduct;i++) {
/* Get string count */
count = GETCOUNTER(offset);
SKIPCOUNTER(offset);
if(compiler->swap) swapinline64(&count);
/* skip count bytes */
offset = INCR(offset,count);
}
}
*offsetp = offset;
return THROW(ret);
}
static int
delimitOpaqueVar(NCD4meta* compiler, NCD4node* var, void** offsetp)
{
int ret = NC_NOERR;
void* offset;
d4size_t i;
unsigned long long count;
d4size_t dimproduct = NCD4_dimproduct(var);
offset = *offsetp;
for(i=0;i<dimproduct;i++) {
/* Walk the instances */
count = GETCOUNTER(offset);
SKIPCOUNTER(offset);
if(compiler->swap) swapinline64(&count);
offset = INCR(offset,count);
}
*offsetp = offset;
return THROW(ret);
}
static int
delimitStructArray(NCD4meta* compiler, NCD4node* varortype, void** offsetp)
{
int ret = NC_NOERR;
void* offset;
d4size_t i;
d4size_t dimproduct;
NCD4node* type;
if(varortype->sort == NCD4_VAR) {
dimproduct = NCD4_dimproduct(varortype);
type = varortype->basetype;
} else {
dimproduct = 1;
type = varortype;
}
offset = *offsetp;
for(i=0;i<dimproduct;i++) {
if((ret=delimitStruct(compiler,type,&offset))) goto done;
}
*offsetp = offset;
done:
return THROW(ret);
}
static int
delimitStruct(NCD4meta* compiler, NCD4node* basetype, void** offsetp)
{
int ret = NC_NOERR;
int i;
void* offset;
offset = *offsetp;
/* The fields are associated with the basetype struct */
for(i=0;i<nclistlength(basetype->vars);i++) {
NCD4node* field = (NCD4node*)nclistget(basetype->vars,i);
switch (field->subsort) {
default:
if((ret=delimitAtomicVar(compiler,field,&offset))) goto done;
break;
case NC_STRUCT: /* recurse */
if((ret=delimitStructArray(compiler,field,&offset))) goto done;
break;
case NC_SEQ:
if((ret=delimitSeqArray(compiler,field,&offset))) goto done;
break;
}
}
*offsetp = offset;
done:
return THROW(ret);
}
static int
delimitSeqArray(NCD4meta* compiler, NCD4node* varortype, void** offsetp)
{
int ret = NC_NOERR;
void* offset;
d4size_t i;
d4size_t dimproduct;
NCD4node* type;
if(varortype->sort == NCD4_VAR) {
dimproduct = NCD4_dimproduct(varortype);
type = varortype->basetype;
} else {
dimproduct = 1;
type = varortype;
}
offset = *offsetp;
for(i=0;i<dimproduct;i++) {
if((ret=delimitSeq(compiler,type,&offset))) goto done;
}
*offsetp = offset;
done:
return THROW(ret);
}
static int
delimitSeq(NCD4meta* compiler, NCD4node* vlentype, void** offsetp)
{
int ret = NC_NOERR;
int i;
void* offset;
d4size_t recordcount;
NCD4node* recordtype;
/* The true type of the record is the basetype of the vlen,
where the vlen type is the basetype of the var
*/
assert(vlentype->subsort == NC_VLEN);
recordtype = vlentype->basetype;
offset = *offsetp;
/* Get he record count */
recordcount = GETCOUNTER(offset);
SKIPCOUNTER(offset);
if(compiler->swap) swapinline64(&recordcount);
for(i=0;i<recordcount;i++) {
switch (recordtype->subsort) {
case NC_STRUCT:
if((ret=delimitStructArray(compiler,recordtype,&offset))) goto done;
break;
case NC_SEQ:
if((ret=delimitSeqArray(compiler,recordtype,&offset))) goto done;
break;
default:
if((ret=delimitAtomicVar(compiler,recordtype,&offset))) goto done;
break;
}
}
*offsetp = offset;
done:
return THROW(ret);
}
/**************************************************/
/*
Walk the (toplevel) var's data to get to the count'th instance.
For efficiency, it can be supplied with a previous case.
Assumes it is called after byte swapping and offsetting.
Assumes that var is not fixed size.
*/
int
NCD4_moveto(NCD4meta* compiler, NCD4node* var, d4size_t count, void** offsetp)
{
int ret = NC_NOERR;
void* offset = NULL;
d4size_t startcount = 0;
NCD4node* basetype = NULL;
ASSERT((ISTOPLEVEL(var)));
offset = *offsetp;
startcount = 0;
basetype = var->basetype;
for(;startcount < count;startcount++) {
if((ret=skipInstance(compiler,basetype,&offset)))
goto done;
}
*offsetp = offset;
done:
return THROW(ret);
}
static int
skipInstance(NCD4meta* compiler, NCD4node* type, void** offsetp)
{
int ret = NC_NOERR;
void* offset = NULL;
offset = *offsetp;
switch (type->subsort) {
case NC_STRUCT:
if((ret=skipStructInstance(compiler,type,&offset))) goto done;
break;
case NC_SEQ:
if((ret=skipSeqInstance(compiler,type,&offset))) goto done;
break;
default:
if((ret=skipAtomicInstance(compiler,type,&offset))) goto done;
break;
}
*offsetp = offset;
done:
return THROW(ret);
}
/* Includes opaque and enum */
static int
skipAtomicInstance(NCD4meta* compiler, NCD4node* type, void** offsetp)
{
int ret = NC_NOERR;
void* offset;
d4size_t count;
int typesize;
offset = *offsetp;
switch (type->subsort) {
default: /* fixed size atomic type */
typesize = NCD4_typesize(type->meta.id);
offset = INCR(offset,typesize);
break;
case NC_STRING:
/* Get string count */
count = GETCOUNTER(offset);
SKIPCOUNTER(offset);
/* skip count bytes */
offset = INCR(offset,count);
break;
case NC_OPAQUE:
/* get count */
count = GETCOUNTER(offset);
SKIPCOUNTER(offset);
offset = INCR(offset,count);
break;
case NC_ENUM:
return skipAtomicInstance(compiler,type->basetype,offsetp);
}
*offsetp = offset;
return THROW(ret);
}
static int
skipStructInstance(NCD4meta* compiler, NCD4node* type, void** offsetp)
{
int ret = NC_NOERR;
d4size_t i,j;
void* offset;
offset = *offsetp;
/* Skip each field */
for(i=0;i<nclistlength(type->vars);i++) {
NCD4node* field = (NCD4node*)nclistget(type->vars,i);
NCD4node* ftype = field->basetype;
d4size_t dimproduct = NCD4_dimproduct(field);
for(j=0;j<dimproduct;j++) {
if((ret=skipInstance(compiler,ftype,&offset)))
goto done;
}
}
*offsetp = offset;
done:
return THROW(ret);
}
static int
skipSeqInstance(NCD4meta* compiler, NCD4node* vlentype, void** offsetp)
{
int ret = NC_NOERR;
d4size_t i;
void* offset;
NCD4node* structtype;
d4size_t recordcount;
offset = *offsetp;
structtype = vlentype->basetype;
ASSERT((structtype->subsort == NC_STRUCT));
/* Get record count */
recordcount = GETCOUNTER(offset);
SKIPCOUNTER(offset);
for(i=0;i<recordcount;i++) {
/* Skip a record instance */
if((ret=skipStructInstance(compiler,structtype,&offset)))
goto done;
}
*offsetp = offset;
done:
return THROW(ret);
}