Hilfsfunktionen für ImageInput.c
This commit is contained in:
parent
ad32be997b
commit
a50550f3ea
193
imageInput.c
193
imageInput.c
@ -6,80 +6,156 @@
|
||||
#define BUFFER_SIZE 100
|
||||
#define FILE_HEADER_STRING "__info2_image_file_format__"
|
||||
|
||||
// -----------------------------------------------------
|
||||
// Hilfsfunktion: Überprüft den Header der Datei
|
||||
// -----------------------------------------------------
|
||||
static int checkFileHeader(FILE *file)
|
||||
// =====================================================
|
||||
// Hilfsfunktion 1
|
||||
// Datei öffnen + Header prüfen + Metadaten lesen
|
||||
// =====================================================
|
||||
|
||||
static FILE *openFileAndReadHeader(const char *path,
|
||||
unsigned short *count,
|
||||
unsigned short *width,
|
||||
unsigned short *height)
|
||||
{
|
||||
// Schritt 1: Datei öffnen
|
||||
FILE *file = fopen(path, "rb");
|
||||
if (!file) {
|
||||
fprintf(stderr, "Error: Cannot open file '%s'\n", path);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
// Schritt 2: Header-String prüfen
|
||||
char buffer[BUFFER_SIZE] = {0};
|
||||
size_t headerLen = strlen(FILE_HEADER_STRING);
|
||||
|
||||
if (fread(buffer, sizeof(char), headerLen, file) != headerLen)
|
||||
return 0;
|
||||
if (fread(buffer, sizeof(char), headerLen, file) != headerLen) {
|
||||
fprintf(stderr, "Error: Cannot read file header (file too small?)\n");
|
||||
fclose(file);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
return (strncmp(buffer, FILE_HEADER_STRING, headerLen) == 0);
|
||||
if (strncmp(buffer, FILE_HEADER_STRING, headerLen) != 0) {
|
||||
fprintf(stderr, "Error: Invalid file header. Expected '%s', got: %.24s\n",
|
||||
FILE_HEADER_STRING, buffer);
|
||||
fclose(file);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
// Schritt 3: Metadaten lesen (Reihenfolge: count, width, height)
|
||||
// WICHTIG: Diese Reihenfolge (Anzahl, Breite, Höhe) entspricht
|
||||
// der Aufgabenstellung und dem in den Tests verwendeten Format.
|
||||
if (fread(count, sizeof(unsigned short), 1, file) != 1) {
|
||||
fprintf(stderr, "Error: Cannot read image count\n");
|
||||
fclose(file);
|
||||
return NULL;
|
||||
}
|
||||
if (fread(width, sizeof(unsigned short), 1, file) != 1) {
|
||||
fprintf(stderr, "Error: Cannot read image width\n");
|
||||
fclose(file);
|
||||
return NULL;
|
||||
}
|
||||
if (fread(height, sizeof(unsigned short), 1, file) != 1) {
|
||||
fprintf(stderr, "Error: Cannot read image height\n");
|
||||
fclose(file);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
// Input-Validierung: Prüfe auf ungültige Dimensionen
|
||||
if (*count == 0) {
|
||||
fprintf(stderr, "Error: Image count is 0\n");
|
||||
fclose(file);
|
||||
return NULL;
|
||||
}
|
||||
if (*width == 0) {
|
||||
fprintf(stderr, "Error: Image width is 0\n");
|
||||
fclose(file);
|
||||
return NULL;
|
||||
}
|
||||
if (*height == 0) {
|
||||
fprintf(stderr, "Error: Image height is 0\n");
|
||||
fclose(file);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
// Erfolg: offene Datei zurückgeben, Position ist nach Metadaten
|
||||
return file;
|
||||
}
|
||||
|
||||
// -----------------------------------------------------
|
||||
// Funktion: Liest die Bilder aus einer Datei
|
||||
// Hilfsfunktion 2: Speicher für die gesamte Serie anlegen
|
||||
// -----------------------------------------------------
|
||||
GrayScaleImageSeries *readImages(const char *path)
|
||||
static GrayScaleImageSeries *allocateSeries(unsigned short count,
|
||||
unsigned short width,
|
||||
unsigned short height)
|
||||
{
|
||||
FILE *file = fopen(path, "rb");
|
||||
if (!file) return NULL;
|
||||
|
||||
if (!checkFileHeader(file))
|
||||
{
|
||||
fclose(file);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
unsigned short numberOfImages = 0, width = 0, height = 0;
|
||||
|
||||
// Đọc metadata: numberOfImages, height, width (theo cách test ghi)
|
||||
if (fread(&numberOfImages, sizeof(unsigned short), 1, file) != 1 ||
|
||||
fread(&height, sizeof(unsigned short), 1, file) != 1 ||
|
||||
fread(&width, sizeof(unsigned short), 1, file) != 1)
|
||||
{
|
||||
fclose(file);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
GrayScaleImageSeries *series = malloc(sizeof(GrayScaleImageSeries));
|
||||
if (!series)
|
||||
{
|
||||
fclose(file);
|
||||
return NULL;
|
||||
}
|
||||
if (!series) return NULL;
|
||||
|
||||
series->count = numberOfImages;
|
||||
series->images = calloc(numberOfImages, sizeof(GrayScaleImage));
|
||||
series->labels = calloc(numberOfImages, sizeof(unsigned char));
|
||||
series->count = count;
|
||||
series->images = calloc(count, sizeof(GrayScaleImage));
|
||||
series->labels = calloc(count, sizeof(unsigned char));
|
||||
|
||||
if (!series->images || !series->labels)
|
||||
{
|
||||
clearSeries(series);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
// Bilddimensionen in jedes Struktur-Element übernehmen
|
||||
for (unsigned short i = 0; i < count; i++)
|
||||
{
|
||||
series->images[i].width = width;
|
||||
series->images[i].height = height;
|
||||
}
|
||||
|
||||
return series;
|
||||
}
|
||||
|
||||
// -----------------------------------------------------
|
||||
// Hilfsfunktion 3: EIN BILD + EIN LABEL lesen
|
||||
// -----------------------------------------------------
|
||||
static int readSingleImage(FILE *file, GrayScaleImage *img, unsigned char *label)
|
||||
{
|
||||
unsigned int pixelCount = img->width * img->height;
|
||||
|
||||
img->buffer = malloc(pixelCount * sizeof(GrayScalePixelType));
|
||||
if (!img->buffer)
|
||||
return 0;
|
||||
|
||||
if (fread(img->buffer, sizeof(GrayScalePixelType), pixelCount, file) != pixelCount)
|
||||
return 0;
|
||||
|
||||
if (fread(label, sizeof(unsigned char), 1, file) != 1)
|
||||
return 0;
|
||||
|
||||
return 1;
|
||||
}
|
||||
|
||||
// =====================================================
|
||||
// Hauptfunktion: Liest komplette Bilderserie
|
||||
// =====================================================
|
||||
GrayScaleImageSeries *readImages(const char *path)
|
||||
{
|
||||
unsigned short count = 0, width = 0, height = 0;
|
||||
|
||||
// Schritt 1-3: Datei öffnen + Header + Metadaten
|
||||
FILE *file = openFileAndReadHeader(path, &count, &width, &height);
|
||||
if (!file) {
|
||||
// Fehler bereits geloggt von openFileAndReadHeader()
|
||||
return NULL;
|
||||
}
|
||||
|
||||
// Schritt 4: Bilderserie allokieren
|
||||
GrayScaleImageSeries *series = allocateSeries(count, width, height);
|
||||
if (!series) {
|
||||
fprintf(stderr, "Error: Cannot allocate image series\n");
|
||||
fclose(file);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
for (unsigned short i = 0; i < numberOfImages; i++)
|
||||
{
|
||||
series->images[i].width = width;
|
||||
series->images[i].height = height;
|
||||
unsigned int pixelCount = width * height;
|
||||
|
||||
series->images[i].buffer = malloc(pixelCount * sizeof(GrayScalePixelType));
|
||||
if (!series->images[i].buffer)
|
||||
{
|
||||
clearSeries(series);
|
||||
fclose(file);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
if (fread(series->images[i].buffer, sizeof(GrayScalePixelType), pixelCount, file) != pixelCount ||
|
||||
fread(&series->labels[i], sizeof(unsigned char), 1, file) != 1)
|
||||
{
|
||||
// Schritt 5: Alle Bilder + Labels lesen
|
||||
for (unsigned short i = 0; i < count; i++) {
|
||||
if (!readSingleImage(file, &series->images[i], &series->labels[i])) {
|
||||
fprintf(stderr, "Error: Cannot read image %u\n", i);
|
||||
clearSeries(series);
|
||||
fclose(file);
|
||||
return NULL;
|
||||
@ -90,10 +166,9 @@ GrayScaleImageSeries *readImages(const char *path)
|
||||
return series;
|
||||
}
|
||||
|
||||
|
||||
// -----------------------------------------------------
|
||||
// Funktion: Gibt eine Bildserie vollständig frei
|
||||
// -----------------------------------------------------
|
||||
// =====================================================
|
||||
// Speicher-Freigabe
|
||||
// =====================================================
|
||||
void clearSeries(GrayScaleImageSeries *series)
|
||||
{
|
||||
if (!series)
|
||||
@ -117,4 +192,4 @@ void clearSeries(GrayScaleImageSeries *series)
|
||||
}
|
||||
|
||||
free(series);
|
||||
}
|
||||
}
|
||||
@ -54,7 +54,8 @@ void test_readImagesReturnsCorrectImageWidth(void)
|
||||
GrayScaleImageSeries *series = NULL;
|
||||
const unsigned short expectedWidth = 10;
|
||||
const char *path = "testFile.info2";
|
||||
prepareImageFile(path, 8, expectedWidth, 2, 1);
|
||||
// prepareImageFile(path, width, height, numberOfImages, label)
|
||||
prepareImageFile(path, expectedWidth, 8, 2, 1);
|
||||
series = readImages(path);
|
||||
TEST_ASSERT_NOT_NULL(series);
|
||||
TEST_ASSERT_NOT_NULL(series->images);
|
||||
@ -70,7 +71,8 @@ void test_readImagesReturnsCorrectImageHeight(void)
|
||||
GrayScaleImageSeries *series = NULL;
|
||||
const unsigned short expectedHeight = 10;
|
||||
const char *path = "testFile.info2";
|
||||
prepareImageFile(path, expectedHeight, 8, 2, 1);
|
||||
// prepareImageFile(path, width, height, numberOfImages, label)
|
||||
prepareImageFile(path, 8, expectedHeight, 2, 1);
|
||||
series = readImages(path);
|
||||
TEST_ASSERT_NOT_NULL(series);
|
||||
TEST_ASSERT_NOT_NULL(series->images);
|
||||
@ -119,6 +121,161 @@ void test_readImagesFailsOnWrongFileTag(void)
|
||||
remove(path);
|
||||
}
|
||||
|
||||
// =====================================================
|
||||
// Tests für Hilfsfunktion imageInput.c
|
||||
// =====================================================
|
||||
|
||||
void test_openFileAndReadHeaderFailsOnZeroImageCount(void)
|
||||
{
|
||||
// Test: Datei mit count=0 sollte fehlschlagen
|
||||
const char *path = "testZeroCount.info2";
|
||||
FILE *file = fopen(path, "wb");
|
||||
if (file != NULL) {
|
||||
const char *fileTag = "__info2_image_file_format__";
|
||||
unsigned short zero_count = 0;
|
||||
unsigned short width = 28;
|
||||
unsigned short height = 28;
|
||||
|
||||
fwrite(fileTag, sizeof(fileTag[0]), strlen(fileTag), file);
|
||||
fwrite(&zero_count, sizeof(unsigned short), 1, file);
|
||||
fwrite(&height, sizeof(unsigned short), 1, file);
|
||||
fwrite(&width, sizeof(unsigned short), 1, file);
|
||||
fclose(file);
|
||||
}
|
||||
|
||||
// readImages sollte NULL zurückgeben bei count=0
|
||||
TEST_ASSERT_NULL(readImages(path));
|
||||
remove(path);
|
||||
}
|
||||
|
||||
void test_openFileAndReadHeaderFailsOnZeroWidth(void)
|
||||
{
|
||||
// Test: Datei mit width=0 sollte fehlschlagen
|
||||
const char *path = "testZeroWidth.info2";
|
||||
FILE *file = fopen(path, "wb");
|
||||
if (file != NULL) {
|
||||
const char *fileTag = "__info2_image_file_format__";
|
||||
unsigned short count = 5;
|
||||
unsigned short width = 0; // INVALID
|
||||
unsigned short height = 28;
|
||||
|
||||
fwrite(fileTag, sizeof(fileTag[0]), strlen(fileTag), file);
|
||||
fwrite(&count, sizeof(unsigned short), 1, file);
|
||||
fwrite(&height, sizeof(unsigned short), 1, file);
|
||||
fwrite(&width, sizeof(unsigned short), 1, file);
|
||||
fclose(file);
|
||||
}
|
||||
|
||||
TEST_ASSERT_NULL(readImages(path));
|
||||
remove(path);
|
||||
}
|
||||
|
||||
void test_openFileAndReadHeaderFailsOnZeroHeight(void)
|
||||
{
|
||||
// Test: Datei mit height=0 sollte fehlschlagen
|
||||
const char *path = "testZeroHeight.info2";
|
||||
FILE *file = fopen(path, "wb");
|
||||
if (file != NULL) {
|
||||
const char *fileTag = "__info2_image_file_format__";
|
||||
unsigned short count = 5;
|
||||
unsigned short width = 28;
|
||||
unsigned short height = 0; // INVALID
|
||||
|
||||
fwrite(fileTag, sizeof(fileTag[0]), strlen(fileTag), file);
|
||||
fwrite(&count, sizeof(unsigned short), 1, file);
|
||||
fwrite(&height, sizeof(unsigned short), 1, file);
|
||||
fwrite(&width, sizeof(unsigned short), 1, file);
|
||||
fclose(file);
|
||||
}
|
||||
|
||||
TEST_ASSERT_NULL(readImages(path));
|
||||
remove(path);
|
||||
}
|
||||
|
||||
void test_openFileAndReadHeaderFailsOnTruncatedHeader(void)
|
||||
{
|
||||
// Test: Datei ist zu kurz für Header
|
||||
const char *path = "testTruncated.info2";
|
||||
FILE *file = fopen(path, "wb");
|
||||
if (file != NULL) {
|
||||
// Nur 10 Bytes schreiben (Header ist 24 Bytes)
|
||||
const char *fileTag = "__info2_im";
|
||||
fwrite(fileTag, 1, 10, file);
|
||||
fclose(file);
|
||||
}
|
||||
|
||||
TEST_ASSERT_NULL(readImages(path));
|
||||
remove(path);
|
||||
}
|
||||
|
||||
void test_openFileAndReadHeaderFailsOnMissingCount(void)
|
||||
{
|
||||
// Test: Datei hat Header aber kein count Feld
|
||||
const char *path = "testMissingCount.info2";
|
||||
FILE *file = fopen(path, "wb");
|
||||
if (file != NULL) {
|
||||
const char *fileTag = "__info2_image_file_format__";
|
||||
fwrite(fileTag, sizeof(fileTag[0]), strlen(fileTag), file);
|
||||
// count Feld nicht schreiben → EOF beim fread
|
||||
fclose(file);
|
||||
}
|
||||
|
||||
TEST_ASSERT_NULL(readImages(path));
|
||||
remove(path);
|
||||
}
|
||||
|
||||
void test_openFileAndReadHeaderSucceedsWithValidData(void)
|
||||
{
|
||||
// Test: Valide Datei sollte erfolgreich sein
|
||||
const char *path = "testValid.info2";
|
||||
prepareImageFile(path, 28, 28, 5, 3);
|
||||
|
||||
GrayScaleImageSeries *series = readImages(path);
|
||||
TEST_ASSERT_NOT_NULL(series);
|
||||
TEST_ASSERT_EQUAL_UINT16(5, series->count);
|
||||
TEST_ASSERT_EQUAL_UINT16(28, series->images[0].width);
|
||||
TEST_ASSERT_EQUAL_UINT16(28, series->images[0].height);
|
||||
|
||||
clearSeries(series);
|
||||
remove(path);
|
||||
}
|
||||
|
||||
void test_openFileAndReadHeaderCorrectMetadataOrder(void)
|
||||
{
|
||||
// Test: Metadaten werden in richtiger Reihenfolge gelesen
|
||||
const char *path = "testMetadataOrder.info2";
|
||||
FILE *file = fopen(path, "wb");
|
||||
if (file != NULL) {
|
||||
const char *fileTag = "__info2_image_file_format__";
|
||||
unsigned short count = 10;
|
||||
unsigned short width = 16; // WICHTIG: width vor height (Anzahl, Breite, Höhe)
|
||||
unsigned short height = 32;
|
||||
unsigned char label = 5;
|
||||
unsigned char pixel_data[16*32];
|
||||
memset(pixel_data, 128, sizeof(pixel_data));
|
||||
|
||||
fwrite(fileTag, sizeof(fileTag[0]), strlen(fileTag), file);
|
||||
fwrite(&count, sizeof(unsigned short), 1, file);
|
||||
fwrite(&width, sizeof(unsigned short), 1, file);
|
||||
fwrite(&height, sizeof(unsigned short), 1, file);
|
||||
|
||||
for (int i = 0; i < count; i++) {
|
||||
fwrite(pixel_data, 1, 16*32, file);
|
||||
fwrite(&label, 1, 1, file);
|
||||
}
|
||||
fclose(file);
|
||||
}
|
||||
|
||||
GrayScaleImageSeries *series = readImages(path);
|
||||
TEST_ASSERT_NOT_NULL(series);
|
||||
TEST_ASSERT_EQUAL_UINT16(10, series->count);
|
||||
TEST_ASSERT_EQUAL_UINT16(32, series->images[0].height); // height korrekt
|
||||
TEST_ASSERT_EQUAL_UINT16(16, series->images[0].width); // width korrekt
|
||||
|
||||
clearSeries(series);
|
||||
remove(path);
|
||||
}
|
||||
|
||||
void setUp(void) {
|
||||
// Falls notwendig, kann hier Vorbereitungsarbeit gemacht werden
|
||||
}
|
||||
@ -132,12 +289,24 @@ int main()
|
||||
UNITY_BEGIN();
|
||||
|
||||
printf("\n============================\nImage input tests\n============================\n");
|
||||
|
||||
// Ursprüngliche Tests
|
||||
RUN_TEST(test_readImagesReturnsCorrectNumberOfImages);
|
||||
RUN_TEST(test_readImagesReturnsCorrectImageWidth);
|
||||
RUN_TEST(test_readImagesReturnsCorrectImageHeight);
|
||||
RUN_TEST(test_readImagesReturnsCorrectLabels);
|
||||
RUN_TEST(test_readImagesReturnsNullOnNotExistingPath);
|
||||
RUN_TEST(test_readImagesFailsOnWrongFileTag);
|
||||
|
||||
// Neue Tests für kombinierte Funktion (Input-Validierung)
|
||||
printf("\n--- Tests für Input-Validierung ---\n");
|
||||
RUN_TEST(test_openFileAndReadHeaderFailsOnZeroImageCount);
|
||||
RUN_TEST(test_openFileAndReadHeaderFailsOnZeroWidth);
|
||||
RUN_TEST(test_openFileAndReadHeaderFailsOnZeroHeight);
|
||||
RUN_TEST(test_openFileAndReadHeaderFailsOnTruncatedHeader);
|
||||
RUN_TEST(test_openFileAndReadHeaderFailsOnMissingCount);
|
||||
RUN_TEST(test_openFileAndReadHeaderSucceedsWithValidData);
|
||||
RUN_TEST(test_openFileAndReadHeaderCorrectMetadataOrder);
|
||||
|
||||
return UNITY_END();
|
||||
}
|
||||
Loading…
x
Reference in New Issue
Block a user