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yap-6.3/C/blobs.c

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2015-07-23 01:00:28 +01:00
//
// blobs.c
// yap
//
// Created by VITOR SANTOS COSTA on 09/05/15.
// Copyright (c) 2015 VITOR SANTOS COSTA. All rights reserved.
//
#include <stdio.h>
#include <string.h>
#include "Yap.h"
#include "Yatom.h"
#include "iopreds.h"
#include "yapio.h"
/* for freeBSD9.1 */
#define _WITH_DPRINTF
#ifdef __APPLE__
#include "fmemopen.h"
#endif
#include "blobs.h"
static blob_type_t unregistered_blob_atom =
{ YAP_BLOB_MAGIC_B,
PL_BLOB_NOCOPY|PL_BLOB_TEXT,
"unregistered"
};
char * Yap_blob_to_string(AtomEntry *ref, const char *s0, size_t sz)
{
int rc;
char *s = (char *)s0;
blob_type_t *type = RepBlobProp(ref->PropsOfAE)->blob_type;
if (type->write) {
FILE *f = fmemopen( s, sz, "w");
if (f == NULL){
// could not find stream;
return NULL;
}
Atom at = AbsAtom(ref);
rc = type->write(f, at, 0);
fclose(f); // return the final result.
return s;
} else {
size_t sz0 = strlcpy( s, RepAtom( AtomSWIStream )->StrOfAE, sz);
s = s+sz0;
sz -= sz0;
#if defined(__linux__) || defined(__APPLE__)
snprintf(s+strlen(s), sz0, "(%p)", ref);
#else
snprintf(s+strlen(s), sz0, "(0x%p)", ref);
#endif
return s;
}
return NULL;
}
int Yap_write_blob(AtomEntry *ref, FILE *stream)
{
blob_type_t *type = RepBlobProp(ref->PropsOfAE)->blob_type;
if (type->write) {
Atom at = AbsAtom(ref);
return type->write(stream, at, 0);
} else {
#if defined(__linux__) || defined(__APPLE__)
return fprintf(stream, "\'%s\'(%p)", RepAtom(AtomSWIStream)->StrOfAE, ref);
#else
return fprintf(stream, "\'%s\'(0x%p)", RepAtom(AtomSWIStream)->StrOfAE, ref);
#endif
}
return 0;
}
bool
YAP_is_blob(Term t, blob_type_t **type)
{
CACHE_REGS
Term yt = Yap_GetFromSlot(t);
Atom a;
BlobPropEntry *b;
if (IsVarTerm(yt))
return FALSE;
if (!IsAtomTerm(yt))
return FALSE;
a = AtomOfTerm(yt);
if (!IsBlob(a))
return FALSE;
b = RepBlobProp(a->PropsOfAE);
*type = b->blob_type;
return TRUE;
}
/* void check_chain(void); */
/* void check_chain(void) { */
/* AtomEntry *ae, *old; */
/* ae = Blobs; */
/* old = NULL; */
/* while (ae) { */
/* old = ae; */
/* ae = RepAtom(ae->NextOfAE); */
/* } */
/* } */
AtomEntry *
Yap_lookupBlob(void *blob, size_t len, void *type0, int *new)
{
BlobPropEntry *b;
AtomEntry *ae;
blob_type_t *type = type0;
if (new)
*new = FALSE;
LOCK(Blobs_Lock);
if (type->flags & PL_BLOB_UNIQUE) {
/* just keep a linked chain for now */
ae = Blobs;
while (ae) {
if (ae->PropsOfAE &&
RepBlobProp(ae->PropsOfAE)->blob_type == type &&
ae->rep.blob->length == len &&
!memcmp(ae->rep.blob->data, blob, len)) {
UNLOCK(Blobs_Lock);
return ae;
}
ae = RepAtom(ae->NextOfAE);
}
}
if (new)
*new = TRUE;
b = (BlobPropEntry *)Yap_AllocCodeSpace(sizeof(BlobPropEntry));
if (!b) {
UNLOCK(Blobs_Lock);
return NULL;
}
b->NextOfPE = NIL;
b->KindOfPE = BlobProperty;
b->blob_type = type;
ae = (AtomEntry *)Yap_AllocCodeSpace(sizeof(AtomEntry)+len+sizeof(size_t));
if (!ae) {
UNLOCK(Blobs_Lock);
return NULL;
}
NOfBlobs++;
INIT_RWLOCK(ae->ARWLock);
ae->PropsOfAE = AbsBlobProp(b);
ae->NextOfAE = AbsAtom(Blobs);
ae->rep.blob->length = len;
memcpy(ae->rep.blob->data, blob, len);
Blobs = ae;
if (NOfBlobs > NOfBlobsMax) {
Yap_signal(YAP_CDOVF_SIGNAL);
}
UNLOCK(Blobs_Lock);
return ae;
}
bool
YAP_unify_blob(Term *t, void *blob, size_t len, blob_type_t *type)
{
AtomEntry *ae;
if (!blob)
return FALSE;
ae = Yap_lookupBlob(blob, len, type, NULL);
if (!ae) {
return FALSE;
}
if (type->acquire) {
type->acquire(AbsAtom(ae));
}
*t = MkAtomTerm(AbsAtom(ae));
return true;
}
bool
YAP_get_blob(Term t, void **blob, size_t *len, blob_type_t **type)
{
CACHE_REGS
Atom a;
Term tt;
AtomEntry *ae;
tt = Yap_GetFromSlot(t);
if (IsVarTerm(tt))
return FALSE;
if (!IsAtomTerm(tt))
return FALSE;
a = AtomOfTerm(tt);
if (!IsBlob(a))
return FALSE;
ae = RepAtom(a);
if (type)
*type = RepBlobProp(ae->PropsOfAE)->blob_type;
if (len)
*len = ae->rep.blob[0].length;
if (blob)
*blob = ae->rep.blob[0].data;
return TRUE;
}
void *
YAP_blob_data(Atom x, size_t *len, blob_type_t **type)
{
if (!IsBlob(x)) {
if (IsWideAtom(x)) {
if ( len )
*len = wcslen(x->WStrOfAE);
if ( type )
*type = &unregistered_blob_atom;
return x->WStrOfAE;
}
if ( len )
*len = strlen(x->StrOfAE);
if ( type )
*type = &unregistered_blob_atom;
return x->StrOfAE;
}
if ( len )
*len = x->rep.blob[0].length;
if ( type )
*type = RepBlobProp(x->PropsOfAE)->blob_type;
return x->rep.blob[0].data;
}
void
YAP_register_blob_type(blob_type_t *type)
{
type->next = (void *)BlobTypes;
BlobTypes = (void*)type;
}
blob_type_t*
YAP_find_blob_type(const char* name)
{
AtomEntry *a = RepAtom(Yap_LookupAtom(name));
if (!IsBlob(a)) {
return &unregistered_blob_atom;
}
return RepBlobProp(a->PropsOfAE)->blob_type;
}
bool
YAP_unregister_blob_type(blob_type_t *type)
{
fprintf(stderr,"YAP_unregister_blob_type not implemented yet\n");
return FALSE;
}
void
Yap_install_blobs(void)
{
}
/**
* @}
*/