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Level read and write.

main
KikooDX 10 months ago
parent
commit
933ee23bd3
  1. 3
      .gitignore
  2. 2
      CMakeLists.txt
  3. 4
      include/level.h
  4. 90
      src/level.c
  5. 5
      src/main.c

3
.gitignore

@ -1 +1,4 @@
build/
# KBLE (Zig) files
backup_*.kble

2
CMakeLists.txt

@ -14,4 +14,4 @@ target_compile_options(${PROJECT_NAME} PRIVATE
-Wunreachable-code -Wstrict-prototypes -Wmissing-prototypes
-Wold-style-definition -Werror-implicit-function-declaration
-ansi -pedantic-errors -g -Os)
target_link_libraries(${PROJECT_NAME} raylib)
#target_link_libraries(${PROJECT_NAME} raylib)

4
include/level.h

@ -1,3 +1,6 @@
/* SPDX-License-Identifier: GPL-3.0-or-later */
/* Copyright (C) 2021 KikooDX */
#pragma once
struct Level {
@ -8,3 +11,4 @@ struct Level {
void level_read(struct Level*, char *path);
void level_free(struct Level*);
void level_write(struct Level level, char *path);

90
src/level.c

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

5
src/main.c

@ -10,12 +10,13 @@ int main(int argc, char **argv) {
struct Level level;
level.data = NULL;
if (argc != 2) {
fprintf(stderr, "ERROR: expected 1 argument, got %d\n", argc-1);
if (argc != 3) {
fprintf(stderr, "ERROR: expected 2 argument, got %d\n", argc-1);
return EXIT_FAILURE;
}
level_read(&level, argv[1]);
level_write(level, argv[2]);
level_free(&level);
return EXIT_SUCCESS;

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