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/*
* cache.c
*
* Save the reflection datablock to save having to recalculate it
*
* (c) 2007 Gordon Ball <gfb21@cam.ac.uk>
* Thomas White <taw27@cam.ac.uk>
*
* dtr - Diffraction Tomography Reconstruction
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include "reflections.h"
#include "cache.h"
ReflectionContext *cache_load(const char *filename) {
FILE *f;
CacheHeader ch;
ReflectionContext *rctx;
size_t cachedreflection_size;
int i;
cachedreflection_size = sizeof(Reflection) - sizeof(Reflection *);
rctx = reflection_init();
f = fopen(filename, "rb");
if ( !f ) {
fprintf(stderr, "Couldn't read reflections from cache\n");
}
if ( fread(&ch, sizeof(CacheHeader), 1, f) == 0 ) {
fprintf(stderr, "Couldn't read reflections from cache\n");
fclose(f);
return NULL;
}
for ( i=0; i<ch.count; i++ ) {
Reflection *cr;
cr = malloc(sizeof(Reflection));
if ( fread(cr, cachedreflection_size, 1, f) == 0 ) {
fprintf(stderr, "Couldn't read reflections from cache\n");
fclose(f);
free(cr);
reflection_clear(rctx);
return NULL;
}
cr->next = NULL; /* Guarantee swift failure in the event of a screw-up */
//printf("reading (%f,%f,%f) i=%f (%d,%d,%d) %d\n",cr->x,cr->y,cr->z,cr->intensity,cr->h,cr->k,cr->l,cr->type);
reflection_add_from_reflection(rctx, cr);
}
fclose(f);
return rctx;
}
int cache_save(const char *input_filename, ReflectionContext *rctx) {
FILE *f;
CacheHeader ch;
Reflection *r;
int count;
const char top[16] = "DTRCACHE\0\0\0\0\0\0\0\0";
size_t cachedreflection_size;
char *cache_filename;
cache_filename = malloc(strlen(input_filename)+7);
strcpy(cache_filename, input_filename);
strcat(cache_filename, ".cache");
printf("Caching reflections to %s\n", cache_filename);
cachedreflection_size = sizeof(Reflection) - sizeof(Reflection *);
count = 0;
r = rctx->reflections;
while ( r != NULL ) {
count++;
r = r->next;
};
f = fopen(cache_filename, "wb");
free(cache_filename);
if ( f == NULL ) {
printf("Couldn't save reflection cache\n");
return -1;
}
memcpy(&ch.top, &top, sizeof(top));
ch.count = count;
ch.scale = 0.; //temp, currently doesn't do anything
fwrite(&ch, sizeof(CacheHeader), 1, f);
r = rctx->reflections;
while ( r != NULL ) {
fwrite(r, cachedreflection_size, 1, f); /* Write the reflection block, stopping just short of the "next" pointer */
r = r->next;
};
fclose(f);
return 0;
}
unsigned int cache_is_cachefile(const char *filename) {
FILE *fh;
CacheHeader ch;
size_t nread;
fh = fopen(filename, "rb");
nread = fread(&ch, sizeof(CacheHeader), 1, fh);
fclose(fh);
if ( nread != 1 ) {
return 0;
}
if ( strncmp(ch.top, "DTRCACHE", 8) == 0 ) {
return 1;
}
/* Backwards compatability */
if ( strncmp(ch.top, "DTR-CACHE", 9) == 0 ) {
return 1;
}
return 0;
}
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