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/*
* cache.c
*
* Save a list of features from images to save recalculation
*
* (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 <assert.h>
#include "image.h"
typedef struct {
char top[16];
uint32_t n_images;
} CacheHeader;
int cache_save(ImageList *images, char *cache_filename) {
FILE *fh;
CacheHeader ch;
uint32_t *index;
size_t index_size;
int i;
fh = fopen(cache_filename, "wb");
if ( !fh ) {
fprintf(stderr, "Couldn't open feature cache file.\n");
return -1;
}
memcpy(&ch.top, "DTR-1.0.6\0\0\0\0\0\0\0", 16);
ch.n_images = images->n_images;
fwrite(&ch, sizeof(CacheHeader), 1, fh);
index_size = images->n_images * 2 * sizeof(uint32_t);
index = malloc(index_size);
/* Dummy write to reserve space in the file */
memset(index, 0, index_size);
if ( fwrite(index, index_size, 1, fh) != 1 ) {
fprintf(stderr, "Couldn't perform dummy index write.\n");
fclose(fh);
return -1;
}
for ( i=0; i<images->n_images; i++ ) {
uint32_t size;
size = images->images[i].features->n_features * sizeof(ImageFeature);
index[2*i] = ftell(fh);
index[2*i + 1] = images->images[i].features->n_features;
if ( fwrite(images->images[i].features->features, size, 1, fh) != 1 ) {
fprintf(stderr, "Couldn't write feature list for image %i.\n", i);
fclose(fh);
return -1;
}
}
/* Actual write */
if ( fseek(fh, sizeof(CacheHeader), SEEK_SET) ) {
fprintf(stderr, "Couldn't seek for index write.\n");
fclose(fh);
return -1;
}
if ( fwrite(index, index_size, 1, fh) != 1 ) {
fprintf(stderr, "Couldn't write index write.\n");
fclose(fh);
return -1;
}
fclose(fh);
return 0;
}
int cache_load(ImageList *images, const char *filename) {
FILE *fh;
CacheHeader ch;
uint32_t *index;
size_t index_size;
int i;
fh = fopen(filename, "rb");
if ( !fh ) {
fprintf(stderr, "Couldn't open cache file.\n");
return -1;
}
if ( fread(&ch, sizeof(CacheHeader), 1, fh) != 1 ) {
fprintf(stderr, "Couldn't read cache header.\n");
fclose(fh);
return -1;
}
/* Format check */
if ( strncmp(ch.top, "DTR-1.0.6\0", 8) != 0 ) {
fprintf(stderr, "Can't read this cache format.\n");
fclose(fh);
return -1;
}
/* Muppet check */
if ( ch.n_images != images->n_images ) {
fprintf(stderr, "Number of images in cache doesn't match.\n");
fclose(fh);
return -1;
}
index_size = images->n_images * 2 * sizeof(uint32_t);
index = malloc(index_size);
if ( fread(index, index_size, 1, fh) != 1 ) {
fprintf(stderr, "Couldn't read index.\n");
fclose(fh);
return -1;
}
for ( i=0; i<images->n_images; i++ ) {
uint32_t size;
uint32_t offs;
int j;
offs = index[2*i];
size = index[2*i + 1];
if ( fseek(fh, offs, SEEK_SET) ) {
fprintf(stderr, "Couldn't seek to feature list for image %i.\n", i);
fclose(fh);
return -1;
}
if ( images->images[i].features ) image_feature_list_free(images->images[i].features);
images->images[i].features = image_feature_list_new();
if ( !images->images[i].features ) {
fprintf(stderr, "Couldn't allocate feature list for image %i.\n", i);
fclose(fh);
return -1;
}
assert(images->images[i].features->features == NULL);
images->images[i].features->features = malloc(size*sizeof(ImageFeature));
if ( !images->images[i].features->features ) {
fprintf(stderr, "Couldn't allocate feature list block for image %i.\n", i);
fclose(fh);
return -1;
}
if ( fread(images->images[i].features->features, size*sizeof(ImageFeature), 1, fh) != 1 ) {
fprintf(stderr, "Couldn't read feature list for image %i.\n", i);
fclose(fh);
return -1;
}
images->images[i].features->n_features = size;
/* Set "parent" fields for all the features */
for ( j=0; j<images->images[i].features->n_features; j++ ) {
images->images[i].features->features[j].parent = &images->images[i];
}
}
fclose(fh);
return 0;
}
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