readImages completed

I2_NeuronalerAbsturz/Start_Mac/imageInput.c

@@ -5,14 +5,90 @@
 
 #define BUFFER_SIZE 100
 #define FILE_HEADER_STRING "__info2_image_file_format__"
+#define HEADER_STRING_LEN strlen(FILE_HEADER_STRING)
 
 // TODO Implementieren Sie geeignete Hilfsfunktionen für das Lesen der Bildserie aus einer Datei
 
+/* ---------------- Hilfsfunktionen ---------------- */
+
+static int readHeader(FILE *file, unsigned int *count, unsigned int *width, unsigned int *height)
+{
+    char buffer[HEADER_STRING_LEN + 1];
+    if (fread(buffer, 1, HEADER_STRING_LEN, file) != HEADER_STRING_LEN)
+        return 0;
+
+    buffer[HEADER_STRING_LEN] = '\0';
+
+    if (strcmp(buffer, FILE_HEADER_STRING) != 0)
+        return 0;
+
+    if (fread(count, sizeof(unsigned int), 1, file) != 1)
+        return 0;
+
+    if (fread(width, sizeof(unsigned int), 1, file) != 1)
+        return 0;
+
+    if (fread(height, sizeof(unsigned int), 1, file) != 1)
+        return 0;
+
+    return 1;
+}
+
+static int readSingleImage(FILE *file, GrayScaleImage *image)
+{
+    unsigned int pixelCount = image->width * image->height;
+
+    if (fread(image->buffer, sizeof(GrayScalePixelType), pixelCount, file) != pixelCount)
+        return 0;
+
+    return 1;
+}
+
+
 // TODO Vervollständigen Sie die Funktion readImages unter Benutzung Ihrer Hilfsfunktionen
 GrayScaleImageSeries *readImages(const char *path)
 {
     GrayScaleImageSeries *series = NULL;
     
+    FILE *file = fopen(path, "rb");
+    if (!file) 
+        return NULL;
+
+    unsigned int count, w, h;
+
+    if (!readHeader(file, &count, &w, &h)) {
+        fclose(file);
+        return NULL;
+    }
+
+    GrayScaleImageSeries *series = malloc(sizeof(GrayScaleImageSeries));
+    series->count = count;
+
+    series->images = malloc(count * sizeof(GrayScaleImage));
+
+    series->labels = malloc(count * sizeof(unsigned char));
+
+    for (unsigned int i = 0; i < count; i++)
+    {
+        series->images[i].width = w;
+        series->images[i].height = h;
+        series->images[i].buffer = malloc(w * h * sizeof(GrayScalePixelType));
+
+        if (!readSingleImage(file, &series->images[i])) {
+            fclose(file);
+            clearSeries(series);
+            return NULL;
+        }
+
+        // label einlesen
+        if (fread(&series->labels[i], sizeof(unsigned char), 1, file) != 1) {
+            fclose(file);
+            clearSeries(series);
+            return NULL;
+        }
+    }
+
+    fclose(file);
     return series;
 }
 

I2_NeuronalerAbsturz/Start_Mac/matrix.c

@@ -6,30 +6,112 @@
 
 Matrix createMatrix(unsigned int rows, unsigned int cols)
 {
+    Matrix m;
+
+    if (rows == 0 || cols == 0) 
+    {
+        m.rows = 0;
+        m.cols = 0;
+        m.buffer = NULL;
+        return m;
+    }
+
+    m.rows = rows;
+    m.cols = cols;
+    m.buffer = (MatrixType *)calloc(rows * cols, sizeof(MatrixType));
     
+    return m;
 }
 
 void clearMatrix(Matrix *matrix)
 {
-    
+    if (matrix != NULL)
+    {
+        if (matrix->buffer != NULL) 
+        {
+            free(matrix->buffer);
+            matrix->buffer = NULL;
+        }
+
+        matrix->rows = 0;
+        matrix->cols = 0;
+    }
 }
 
 void setMatrixAt(MatrixType value, Matrix matrix, unsigned int rowIdx, unsigned int colIdx)
 {
-    
+    if (matrix.buffer != NULL)
+    {
+        if (rowIdx < matrix.rows || colIdx < matrix.cols)
+        {
+            matrix.buffer[rowIdx * matrix.cols + colIdx] = value;
+        }
+    }
 }
 
 MatrixType getMatrixAt(const Matrix matrix, unsigned int rowIdx, unsigned int colIdx)
 {
-    
+    if (matrix.buffer == NULL || rowIdx >= matrix.rows || colIdx >= matrix.cols)   
+    {
+        return UNDEFINED_MATRIX_VALUE;
+    }
+
+    return matrix.buffer[rowIdx * matrix.cols + colIdx];
 }
 
 Matrix add(const Matrix matrix1, const Matrix matrix2)
 {
-    
+    Matrix result;
+
+    if (matrix1.buffer == NULL || matrix2.buffer == NULL || matrix1.rows != matrix2.rows || matrix1.cols != matrix2.cols) 
+    {
+        result.rows = 0;
+        result.cols = 0;
+        result.buffer = NULL;
+        return result;
+    }
+
+    result = createMatrix(matrix1.rows, matrix1.cols);
+
+    for (int i = 0; i < matrix1.rows; i++) 
+    {
+        for (int j = 0; j < matrix1.cols; j++) 
+        {
+            MatrixType value = getMatrixAt(matrix1, i, j) + getMatrixAt(matrix2, i, j);
+            setMatrixAt(value, result, i, j);
+        }
+    }
+
+    return result;
 }
 
 Matrix multiply(const Matrix matrix1, const Matrix matrix2)
 {
-    
-}
+    Matrix result;
+
+    if (matrix1.buffer == NULL || matrix2.buffer == NULL || matrix1.cols != matrix2.rows) 
+    {
+        result.rows = 0;
+        result.cols = 0;
+        result.buffer = NULL;
+        return result;
+    }
+
+    result = createMatrix(matrix1.rows, matrix2.cols);
+
+    for (int i = 0; i < matrix1.rows; i++) 
+    {
+        for (int j = 0; j < matrix2.cols; j++) 
+        {
+            MatrixType sum = 0;
+
+            for (int k = 0; k < matrix1.cols; k++) 
+            {
+                sum += getMatrixAt(matrix1, i, k) * getMatrixAt(matrix2, k, j);
+            }
+            setMatrixAt(sum, result, i, j);
+        }
+    }
+
+    return result;
+}

I2_NeuronalerAbsturz/Start_Mac/matrix.h

@@ -7,6 +7,13 @@ typedef float MatrixType;
 
 // TODO Matrixtyp definieren
 
+typedef struct
+{
+    int rows;
+    int cols;
+    MatrixType *buffer;
+} Matrix;
+
 
 Matrix createMatrix(unsigned int rows, unsigned int cols);
 void clearMatrix(Matrix *matrix);

I2_Wortsalat/Start_Linux/input.c

@@ -1,9 +1,13 @@
 #include "input.h"
-#include <string.h>
 #include <ctype.h>
+#include <string.h>
 
 // TODO:
-// eine Funktion implementieren, die ein einzelnes Wort aus einer Textdatei (words.txt) einliest und als C-String zurückgibt.
+// eine Funktion implementieren, die ein einzelnes Wort aus einer Textdatei
+// (words.txt) einliest und als C-String zurückgibt.
+
+// Bedingungen, die in main.c geprüft werden:
+//  - existiert die angegebene Datei
 
 // Read words from file and store in 'words' array
 int readWords(FILE *file, char words[][MAX_WORD_LEN], unsigned int maxWordCount)
@@ -39,4 +43,4 @@ int readWords(FILE *file, char words[][MAX_WORD_LEN], unsigned int maxWordCount)
 
 
     return word_counter;
-}
+}