Add bit array

Makefile

@@ -107,6 +107,9 @@ CFLAGS := -g -Wall -Wextra -Wno-free-nonheap-object -Wno-unknown-pragmas -Wno-ps
  -ffast-math
 
 CFLAGS += $(INCLUDE) -DARM9
+ifeq ($(DEBUG_BUILD),yes)
+CFLAGS += -DDEBUG_BUILD
+endif
 CXXFLAGS := $(CFLAGS) -fno-rtti -fno-exceptions -Wno-reorder
 
 ASFLAGS := -g $(ARCH)
@@ -185,15 +188,15 @@ export LIBPATHS := $(foreach dir,$(LIBDIRS),-L$(dir)/lib)
 #---------------------------------------------------------------------------------
 $(BUILD):
  @[ -d $@ ] || mkdir -p $@
- @$(MAKE) BUILDDIR=`cd $(BUILD) && pwd` --no-print-directory -C $(BUILD) -f $(CURDIR)/Makefile
+ @$(MAKE) BUILDDIR=`cd $(BUILD) && pwd` --no-print-directory -C $(BUILD) -f $(CURDIR)/Makefile DEBUG_BUILD=$(DEBUG_BUILD)
 
 #---------------------------------------------------------------------------------
 clean:
  @echo clean ...
  @rm -fr $(BUILD) $(TARGET).elf $(TARGET).nds $(SOUNDBANK)
 
 #---------------------------------------------------------------------------------
-EMULATOR := E:/melonds/melonds
+EMULATOR := ~/melonDS
 run:
  @echo run ...
  @$(EMULATOR) $(TARGET).nds

include/bitarray.h

@@ -0,0 +1,20 @@
+#pragma once
+
+#include <stdint.h>
+#include <stddef.h>
+#include <stdbool.h>
+
+typedef struct
+{
+ size_t bitCount;
+ uint8_t *array;
+} BitArray;
+
+// bit count must be divisible by 8 for this to work
+BitArray bitArrayCreate(size_t bitCount);
+void bitArrayDelete(BitArray *array);
+
+void bitArraySet(BitArray *array, size_t index);
+void bitArrayClear(BitArray *array, size_t index);
+bool bitArrayGet(BitArray *array, size_t index);
+void bitArrayWrite(BitArray array, const char *file);

source/bitarray.c

@@ -0,0 +1,54 @@
+#include "bitarray.h"
+#include <nds/system.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+BitArray bitArrayCreate(size_t bitCount)
+{
+ BitArray array;
+ array.array = (uint8_t *)calloc(bitCount, 1);
+ array.bitCount = bitCount;
+ return array;
+}
+
+void bitArrayDelete(BitArray *array)
+{
+ free(array->array);
+}
+
+void bitArraySet(BitArray *array, size_t index)
+{
+ array->array[index / 8] |= (1 << (index % 8));
+}
+
+void bitArrayClear(BitArray *array, size_t index)
+{
+ array->array[index / 8] &= ~(1 << (index % 8));
+}
+
+bool bitArrayGet(BitArray *array, size_t index)
+{
+ if (array->array[index / 8] & (1 << index % 8))
+ return true;
+ return false;
+}
+
+void bitArrayWrite(BitArray array, const char *file)
+{
+ FILE *fp = fopen(file, "w");
+ if (!fp)
+ {
+ FILE *fpError = fopen("error.log", "w");
+ if (fpError)
+ {
+ // write error into an error file
+ fprintf(fpError, "Failed to open file %s for writing bit array", file);
+ fclose(fpError);
+ }
+ systemShutDown();
+ }
+
+ for (size_t i = 0; i < array.bitCount; ++i)
+ fputc((bitArrayGet(&array, i)) ? '1' : '0', fp);
+ fclose(fp);
+}

source/main.c

@@ -8,6 +8,7 @@
 #include "soundbank.h"
 #include "colors.h"
 #include "ppm.h"
+#include "bitarray.h"
 #include "background.h"
 #define COLORS_PER_PAGE 7
 #define MAX_COLOR_PAGE 1
@@ -167,6 +168,9 @@ int main(int argc, char **argv)
  mkdir("paintds_data", 0700);
  chdir("paintds_data");
 
+ BitArray test = bitArrayCreate(32);
+ bitArrayWrite(test, "test.bitarr");
+
  mmInitDefault("nitro:/soundbank.bin");
 
  mmLoadEffect(SFX_PENCIL);