generated from freudenreichan/info2Praktikum-NeuronalesNetz
fix image input.c
This commit is contained in:
D2A62006
parent
e0ded7b738
commit
2b388ab748
176
imageInput.c
176
imageInput.c
@ -7,94 +7,131 @@
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#define FILE_HEADER_STRING "__info2_image_file_format__"
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/// @brief Gets the next char value from specified and opened file
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/// @brief Reads a value in little-endian format from file
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/// @param openedFile stream FILE, from which to read
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/// @param iterations how many chars are being taken from (1 char equals 2 Hexdecimals equals 8bit)
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static int getCharValueFromFile(FILE* openedFile, int iterations) {
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int addToFile = 0;
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/// @param bytes how many bytes to read
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static unsigned int readLittleEndian(FILE* openedFile, int bytes) {
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unsigned int value = 0;
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if (openedFile == NULL) return 0;
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for (int i = 0; i < iterations; i++) {
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for (int i = 0; i < bytes; i++) {
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int tmp = fgetc(openedFile);
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//If the File ends, the method returns a '0'
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if (openedFile == EOF) return addToFile;
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addToFile += tmp;
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if (tmp == EOF) return 0;
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value |= ((unsigned int)tmp) << (i * 8);
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}
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return addToFile;
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return value;
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}
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// TODO Vervollständigen Sie die Funktion readImages unter Benutzung Ihrer Hilfsfunktionen
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GrayScaleImageSeries *readImages(const char *path)
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{
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GrayScaleImageSeries *series = NULL;
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FILE* openFile;
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openFile = fopen(path, "rb");
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FILE* openFile = fopen(path, "rb");
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// file Could not be opened/does not exist
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if (openFile != NULL) {
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if (openFile == NULL) {
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return NULL;
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}
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char* actualFileTag = malloc(strlen(FILE_HEADER_STRING) * sizeof(char));
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int numberOfImages = 0;
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int width = 0;
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int height = 0;
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char actualFileTag[strlen(FILE_HEADER_STRING) + 1];
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size_t tagLength = strlen(FILE_HEADER_STRING);
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if (fread(actualFileTag, 1, tagLength, openFile) != tagLength) {
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fclose(openFile);
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return NULL;
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}
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actualFileTag[tagLength] = '\0';
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for (int i = 0; i < strlen(FILE_HEADER_STRING); i++) {
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actualFileTag += fgetc(openFile);
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// checks if the files are equal
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if (strcmp(actualFileTag, FILE_HEADER_STRING) != 0) {
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fclose(openFile);
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return NULL;
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}
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unsigned int numberOfImages = readLittleEndian(openFile, 2);
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// no Images in series -> No image-series
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if (numberOfImages == 0) {
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fclose(openFile);
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return NULL;
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}
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unsigned int width = readLittleEndian(openFile, 2);
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unsigned int height = readLittleEndian(openFile, 2);
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// no height/width --> impossible file
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if(height == 0 || width == 0) {
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fclose(openFile);
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return NULL;
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}
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//all the starting parameters are set --> the images can be read and stored
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GrayScaleImageSeries* series = malloc(sizeof(GrayScaleImageSeries));
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if (series == NULL) {
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fclose(openFile);
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return NULL;
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}
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GrayScaleImage* images = malloc(numberOfImages * sizeof(GrayScaleImage));
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unsigned char* labels = malloc(numberOfImages * sizeof(unsigned char));
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if (images == NULL || labels == NULL) {
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free(images);
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free(labels);
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free(series);
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fclose(openFile);
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return NULL;
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}
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series->count = 0;
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series->images = images;
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series->labels = labels;
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for (unsigned int i = 0; i < numberOfImages; i++) {
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// allocating the actual matrix image for each image
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images[i].buffer = malloc(width * height);
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if (images[i].buffer == NULL) {
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for (unsigned int k = 0; k < i; k++) {
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free(images[k].buffer);
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}
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free(images);
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free(labels);
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free(series);
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fclose(openFile);
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return NULL;
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}
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// checks if the files are equal: strcmp should return '0' --> convert it to '1' for 'true'
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int fileTagEqual = !strcmp(actualFileTag, FILE_HEADER_STRING);
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images[i].height = height;
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images[i].width = width;
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//we only need the fileTag to verify its an image for our series.
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free(actualFileTag);
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actualFileTag = NULL;
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if (fileTagEqual) {
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numberOfImages = getCharValueFromFile(openFile, 2);
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// no Images in series -> No image-series
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if (numberOfImages == 0) {
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fclose(openFile);
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return series;
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}
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width = getCharValueFromFile(openFile, 2);
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height = getCharValueFromFile(openFile, 2);
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// no height/width --> impossible file
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if(height == 0 || width == 0) {
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fclose(openFile);
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return series;
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}
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//all the starting parameters are set --> the images can be read and stored
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GrayScaleImage* images = malloc(numberOfImages * sizeof(GrayScaleImage));
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unsigned char* labels = malloc(numberOfImages * sizeof(unsigned char));
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series->count = 0;
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series->images = images;
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series->labels = labels;
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for (int i = 0; i < numberOfImages; i++) {
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for (int j = 0; j < width * height; j++) {
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// allocating the actual matrix image for image
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images[i].buffer = malloc(width * height);
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images[i].height = height;
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images[i].width = width;
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images[i].buffer[j] = fgetc(openFile);
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}
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//rest of the values that only affect the image itself
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series->labels[i] = fgetc(openFile);
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series->count++;
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if (fread(images[i].buffer, 1, width * height, openFile) != width * height) {
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for (unsigned int k = 0; k <= i; k++) {
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free(images[k].buffer);
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}
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free(images);
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free(labels);
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free(series);
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fclose(openFile);
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return NULL;
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}
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//rest of the values that only affect the image itself
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int label = fgetc(openFile);
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if (label == EOF) {
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for (unsigned int k = 0; k <= i; k++) {
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free(images[k].buffer);
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}
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free(images);
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free(labels);
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free(series);
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fclose(openFile);
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return NULL;
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}
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series->labels[i] = (unsigned char)label;
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series->count++;
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}
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fclose(openFile);
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@ -104,12 +141,13 @@ GrayScaleImageSeries *readImages(const char *path)
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// TODO Vervollständigen Sie die Funktion clearSeries, welche eine Bildserie vollständig aus dem Speicher freigibt
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void clearSeries(GrayScaleImageSeries *series)
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{
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if (series == NULL) return;
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for (int i = 0; i < series->count; i++) {
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free(series->images[i].buffer);
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}
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free(series->images);
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series->images = NULL;
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free(series->labels);
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series->labels = NULL;
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free(series);
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}
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115
imageInput_old.c
Normal file
115
imageInput_old.c
Normal file
@ -0,0 +1,115 @@
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "imageInput.h"
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#define BUFFER_SIZE 100
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#define FILE_HEADER_STRING "__info2_image_file_format__"
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/// @brief Gets the next char value from specified and opened file
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/// @param openedFile stream FILE, from which to read
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/// @param iterations how many chars are being taken from (1 char equals 2 Hexdecimals equals 8bit)
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static int getCharValueFromFile(FILE* openedFile, int iterations) {
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int addToFile = 0;
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if (openedFile == NULL) return 0;
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for (int i = 0; i < iterations; i++) {
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int tmp = fgetc(openedFile);
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//If the File ends, the method returns a '0'
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if (openedFile == EOF) return addToFile;
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addToFile += tmp;
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}
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return addToFile;
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}
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// TODO Vervollständigen Sie die Funktion readImages unter Benutzung Ihrer Hilfsfunktionen
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GrayScaleImageSeries *readImages(const char *path)
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{
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GrayScaleImageSeries *series = NULL;
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FILE* openFile;
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openFile = fopen(path, "rb");
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// file Could not be opened/does not exist
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if (openFile != NULL) {
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char* actualFileTag = malloc(strlen(FILE_HEADER_STRING) * sizeof(char));
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int numberOfImages = 0;
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int width = 0;
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int height = 0;
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for (int i = 0; i < strlen(FILE_HEADER_STRING); i++) {
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actualFileTag += fgetc(openFile);
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}
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// checks if the files are equal: strcmp should return '0' --> convert it to '1' for 'true'
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int fileTagEqual = !strcmp(actualFileTag, FILE_HEADER_STRING);
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//we only need the fileTag to verify its an image for our series.
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free(actualFileTag);
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actualFileTag = NULL;
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if (fileTagEqual) {
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numberOfImages = getCharValueFromFile(openFile, 2);
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// no Images in series -> No image-series
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if (numberOfImages == 0) {
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fclose(openFile);
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return series;
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}
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width = getCharValueFromFile(openFile, 2);
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height = getCharValueFromFile(openFile, 2);
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// no height/width --> impossible file
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if(height == 0 || width == 0) {
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fclose(openFile);
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return series;
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}
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//all the starting parameters are set --> the images can be read and stored
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GrayScaleImage* images = malloc(numberOfImages * sizeof(GrayScaleImage));
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unsigned char* labels = malloc(numberOfImages * sizeof(unsigned char));
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series->count = 0;
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series->images = images;
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series->labels = labels;
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for (int i = 0; i < numberOfImages; i++) {
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for (int j = 0; j < width * height; j++) {
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// allocating the actual matrix image for image
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images[i].buffer = malloc(width * height);
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images[i].height = height;
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images[i].width = width;
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images[i].buffer[j] = fgetc(openFile);
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}
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//rest of the values that only affect the image itself
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series->labels[i] = fgetc(openFile);
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series->count++;
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}
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}
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}
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fclose(openFile);
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return series;
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}
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// TODO Vervollständigen Sie die Funktion clearSeries, welche eine Bildserie vollständig aus dem Speicher freigibt
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void clearSeries(GrayScaleImageSeries *series)
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{
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for (int i = 0; i < series->count; i++) {
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free(series->images[i].buffer);
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}
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free(series->images);
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series->images = NULL;
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free(series->labels);
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series->labels = NULL;
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}
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