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Remove offset in read_images

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augustin64 2022-03-20 15:00:53 +01:00
parent 109c583b0f
commit 4cc1041e88
1 changed files with 12 additions and 10 deletions
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22
src/preview_mnist.c
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@ -15,7 +15,7 @@ uint32_t swap_endian(uint32_t val) {
// commencant à l'adresse mémoire start // commencant à l'adresse mémoire start
// dans le fichier pointé par ptr // dans le fichier pointé par ptr
void print_image(unsigned int width, unsigned int height, FILE* ptr, int start) { void print_image(unsigned int width, unsigned int height, FILE* ptr, int start) {
unsigned char buffer[width*height+start]; unsigned char buffer[width*height];
fread(buffer, sizeof(buffer), 1, ptr); fread(buffer, sizeof(buffer), 1, ptr);
@ -24,7 +24,7 @@ void print_image(unsigned int width, unsigned int height, FILE* ptr, int start)
for (int i=0; i<height; i++) { for (int i=0; i<height; i++) {
for (int j=0; j<width; j++) { for (int j=0; j<width; j++) {
cur = (int)buffer[start+j+i*width]; cur = (int)buffer[j+i*width];
printf("%c", tab[cur/52]); printf("%c", tab[cur/52]);
} }
printf("\n"); printf("\n");
@ -34,7 +34,7 @@ void print_image(unsigned int width, unsigned int height, FILE* ptr, int start)
// Lit un set de données images de la base de données MNIST // Lit un set de données images de la base de données MNIST
// dans le fichier situé à filename, les // dans le fichier situé à filename, les
// images comportant comme labels 'labels' // images comportant comme labels 'labels'
void read_mnist_images(char* filename, unsigned char* labels) { void read_mnist_images(char* filename, unsigned int* labels) {
FILE *ptr; FILE *ptr;
ptr = fopen(filename, "rb"); ptr = fopen(filename, "rb");
@ -66,13 +66,13 @@ void read_mnist_images(char* filename, unsigned char* labels) {
//printf("%u x %u\n\n", width, height); //printf("%u x %u\n\n", width, height);
for (int i=0; i < number_of_images; i++) { for (int i=0; i < number_of_images; i++) {
printf("--- Number %d : %u ---\n", i, labels[i]); printf("--- Number %d : %d ---\n", i, labels[i]);
print_image(width, height, ptr, (i*width*height)); print_image(width, height, ptr, (i*width*height));
} }
} }
unsigned char* read_mnist_labels(char* filename) { unsigned int* read_mnist_labels(char* filename) {
FILE* ptr; FILE* ptr;
ptr = fopen(filename, "rb"); ptr = fopen(filename, "rb");
@ -93,11 +93,13 @@ unsigned char* read_mnist_labels(char* filename) {
printf("number of items: %" PRIu32 "\n", number_of_items); printf("number of items: %" PRIu32 "\n", number_of_items);
unsigned char* labels = malloc(sizeof(unsigned char)*number_of_items); unsigned char buffer[number_of_items];
unsigned char tmp; fread(buffer, sizeof(unsigned char), number_of_items, ptr);
unsigned int* labels = malloc(sizeof(unsigned int)*number_of_items);
for (int i=0; i< number_of_items; i++) { for (int i=0; i< number_of_items; i++) {
fread(&tmp, sizeof(unsigned char), 1, ptr); labels[i] = (unsigned int)buffer[i];
labels[i] = tmp;
} }
return labels; return labels;
} }
@ -107,7 +109,7 @@ int main(int argc, char *argv[]) {
printf("Utilisation: %s [IMAGES FILE] [LABELS FILE]\n", argv[0]); printf("Utilisation: %s [IMAGES FILE] [LABELS FILE]\n", argv[0]);
return 1; return 1;
} }
unsigned char* labels = read_mnist_labels(argv[2]); unsigned int* labels = read_mnist_labels(argv[2]);
read_mnist_images(argv[1], labels); read_mnist_images(argv[1], labels);
free(labels); free(labels);
return 0; return 0;