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@ -10,13 +10,13 @@
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static const int kble_fmt_version = 0;
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static int read_byte(FILE *file);
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static int read_byte_group(FILE *file, int number);
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static int read_byte_group(FILE *file, int size);
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static void write_byte(FILE *file, unsigned char byte);
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static void write_byte_group(FILE *file, int value, int size);
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void level_read(struct Level *level, char *path) {
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FILE *file = NULL;
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int byte = 0;
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int width = 0;
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int height = 0;
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int tile_size = 0;
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int level_size = 0;
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int tile = 0;
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@ -25,7 +25,7 @@ void level_read(struct Level *level, char *path) {
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/* open file in read mode */
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file = fopen(path, "rb");
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if (file == NULL) {
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fprintf(stderr, "ERROR: Cannot open input file %s\n", path);
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fprintf(stderr, "ERROR: cannot open input file %s\n", path);
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exit(EXIT_FAILURE);
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}
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@ -40,12 +40,12 @@ void level_read(struct Level *level, char *path) {
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/* get tile size (in bytes) */
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tile_size = read_byte(file);
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/* get width */
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width = read_byte_group(file, 2);
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level->width = read_byte_group(file, 2);
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/* get height */
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height = read_byte_group(file, 2);
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level->height = read_byte_group(file, 2);
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/* allocate memory for data */
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level_size = width * height;
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level_size = level->width * level->height;
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if (level->data == NULL) {
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level->data = malloc(level_size * sizeof(int));
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} else {
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@ -71,9 +71,52 @@ void level_free(struct Level *level) {
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free(level->data);
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}
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/* Read a single byte safely (handles EOF). */
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void level_write(struct Level level, char *path) {
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FILE *file = NULL;
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int tile = 0;
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int tile_size = 0;
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int max_tile_size = 1;
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int i = 0;
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const int level_size = level.width * level.height;
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/* open file in write mode */
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file = fopen(path, "wb");
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if (file == NULL) {
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fprintf(stderr, "ERROR: cannot open output file %s\n", path);
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exit(EXIT_FAILURE);
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}
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/* find longest value in data (in bytes) */
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for (i = 0; i < level_size; i += 1) {
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tile = level.data[i];
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tile_size = 1;
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while (tile >>= 8)
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tile_size += 1;
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if (tile_size > max_tile_size)
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max_tile_size = tile_size;
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}
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/* write KBLE format version */
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write_byte(file, kble_fmt_version);
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/* write tile size (in bytes) */
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write_byte(file, max_tile_size);
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/* write width */
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write_byte_group(file, level.width, 2);
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/* write height */
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write_byte_group(file, level.height, 2);
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/* write level content */
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for (i = 0; i < level_size; i += 1) {
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write_byte_group(file, level.data[i], max_tile_size);
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}
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/* close file */
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fclose(file);
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}
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/* Read a single byte safely (handle EOF). */
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static int read_byte(FILE *file) {
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const int byte = getc(file);
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const int byte = fgetc(file);
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if (byte == EOF) {
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fprintf(stderr, "ERROR: unexpected EOF\n");
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exit(EXIT_FAILURE);
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@ -82,15 +125,38 @@ static int read_byte(FILE *file) {
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}
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/* Read multiple bytes and "merge" them into one integer. */
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static int read_byte_group(FILE *file, int number) {
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static int read_byte_group(FILE *file, int size) {
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int byte = 0;
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int merged = 0;
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int i = 0;
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int shift = number * 8;
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for (i = 0; i < number; i += 1) {
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int shift = size * 8;
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for (i = 0; i < size; i += 1) {
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shift -= 8;
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byte = read_byte(file);
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merged |= byte << shift;
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}
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return merged;
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}
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/* Write a single byte safely (handle EOF). */
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static void write_byte(FILE *file, unsigned char byte) {
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const int result = fputc(byte, file);
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if (result == EOF) {
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fprintf(stderr, "ERROR: file write error\n");
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exit(EXIT_FAILURE);
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}
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}
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/* Write an integer as multiple bytes. */
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static void write_byte_group(FILE *file, int value, int size) {
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int byte = 0;
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int shift = size * 8;
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int i = 0;
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const int mask = (1 << 8) - 1;
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for (i = 0; i < size; i += 1) {
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shift -= 8;
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byte = value >> shift;
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byte &= mask;
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write_byte(file, byte);
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}
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}
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