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bindata.c
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bindata.c
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/*********************************************************************
* Copyright 2009, UCAR/Unidata
* See netcdf/COPYRIGHT file for copying and redistribution conditions.
*********************************************************************/
#include "includes.h"
#include "nc_iter.h"
#ifdef ENABLE_BINARY
static void alignto(int alignment, Bytebuffer* buf, int base);
static int bin_uid = 0;
static int
bin_charconstant(Generator* generator, Symbol* sym, Bytebuffer* buf, ...)
{
/* Just transfer charbuf to codebuf */
Bytebuffer* charbuf;
va_list ap;
vastart(ap,buf);
charbuf = va_arg(ap, Bytebuffer*);
va_end(ap);
bbNull(charbuf);
bbCatbuf(buf,charbuf);
return 1;
}
static int
bin_constant(Generator* generator, Symbol* sym, NCConstant* con, Bytebuffer* buf,...)
{
if(con->nctype != NC_ECONST) {
alignbuffer(con,buf);
}
switch (con->nctype) {
case NC_OPAQUE: {
unsigned char* bytes = NULL;
size_t len;
/* Assume the opaque string has been normalized */
bytes=makebytestring(con->value.opaquev.stringv,&len);
bbAppendn(buf,(void*)bytes,len);
free(bytes);
} break;
case NC_CHAR:
bbAppendn(buf,&con->value.charv,sizeof(con->value.charv));
break;
case NC_BYTE:
bbAppendn(buf,(void*)&con->value.int8v,sizeof(con->value.int8v));
break;
case NC_SHORT:
bbAppendn(buf,(void*)&con->value.int16v,sizeof(con->value.int16v));
break;
case NC_INT:
bbAppendn(buf,(void*)&con->value.int32v,sizeof(con->value.int32v));
break;
case NC_FLOAT:
bbAppendn(buf,(void*)&con->value.floatv,sizeof(con->value.floatv));
break;
case NC_DOUBLE:
bbAppendn(buf,(void*)&con->value.doublev,sizeof(con->value.doublev));
break;
case NC_UBYTE:
bbAppendn(buf,(void*)&con->value.uint8v,sizeof(con->value.uint8v));
break;
case NC_USHORT:
bbAppendn(buf,(void*)&con->value.uint16v,sizeof(con->value.uint16v));
break;
case NC_UINT:
bbAppendn(buf,(void*)&con->value.uint32v,sizeof(con->value.uint32v));
break;
case NC_INT64: {
union SI64 { char ch[8]; long long i64;} si64;
si64.i64 = con->value.int64v;
bbAppendn(buf,(void*)si64.ch,sizeof(si64.ch));
} break;
case NC_UINT64: {
union SU64 { char ch[8]; unsigned long long i64;} su64;
su64.i64 = con->value.uint64v;
bbAppendn(buf,(void*)su64.ch,sizeof(su64.ch));
} break;
case NC_NIL:
case NC_STRING: {
char* ptr;
int len = (size_t)con->value.stringv.len;
if(len == 0 && con->value.stringv.stringv == NULL) {
char* nil = NULL;
bbAppendn(buf,(void*)&nil,sizeof(nil));
} else {
ptr = (char*)ecalloc(len+1);
memcpy(ptr,con->value.stringv.stringv,len);
ptr[len] = '\0';
bbAppendn(buf,(void*)&ptr,sizeof(ptr));
}
} break;
default: PANIC1("bin_constant: unexpected type: %d",con->nctype);
}
return 1;
}
static int
bin_listbegin(Generator* generator, Symbol* tsym, void* liststate, ListClass lc, size_t size, Bytebuffer* buf, int* uidp, ...)
{
if(uidp) *uidp = ++bin_uid;
if(lc == LISTCOMPOUND)
*((int*)liststate) = bbLength(buf);
return 1;
}
static int
bin_list(Generator* generator, Symbol* tsym, void* liststate, ListClass lc, int uid, size_t count, Bytebuffer* buf, ...)
{
if(lc == LISTCOMPOUND) {
int offsetbase = *((int*)liststate);
/* Pad for the alignment */
alignto(tsym->typ.alignment,buf,offsetbase);
}
return 1;
}
static int
bin_listend(Generator* generator, Symbol* tsym, void* liststate, ListClass lc, int uid, size_t count, Bytebuffer* buf, ...)
{
if(lc == LISTCOMPOUND) {
int offsetbase = *((int*)liststate);
/* Pad out the whole instance */
alignto(tsym->typ.cmpdalign,buf,offsetbase);
}
return 1;
}
static int
bin_vlendecl(Generator* generator, Symbol* tsym, Bytebuffer* buf, int uid, size_t count,...)
{
va_list ap;
Bytebuffer* vlenmem;
nc_vlen_t ptr;
vastart(ap,count);
vlenmem = va_arg(ap, Bytebuffer*);
va_end(ap);
ptr.len = count;
ptr.p = bbDup(vlenmem);
bbAppendn(buf,(char*)&ptr,sizeof(ptr));
return 1;
}
static int
bin_vlenstring(Generator* generator, Symbol* sym, Bytebuffer* codebuf, int* uidp, size_t* sizep,...)
{
Bytebuffer* vlenmem;
nc_vlen_t ptr;
va_list ap;
if(uidp) *uidp = ++bin_uid;
vastart(ap,sizep);
vlenmem = va_arg(ap, Bytebuffer*);
va_end(ap);
ptr.len = bbLength(vlenmem);
ptr.p = bbDup(vlenmem);
bbAppendn(codebuf,(char*)&ptr,sizeof(ptr));
return 1;
}
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)
{
int pad = 0;
int 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);
}
}
/* Define the single static bin data generator */
static Generator bin_generator_singleton = {
NULL,
bin_charconstant,
bin_constant,
bin_listbegin,
bin_list,
bin_listend,
bin_vlendecl,
bin_vlenstring
};
Generator* bin_generator = &bin_generator_singleton;
#endif /*ENABLE_BINARY*/