#pragma pack(push,1)

typedef struct {

  unsigned char  idLength;

  unsigned char  colormapType;

  unsigned char  imageType;

  unsigned short colormapIndex;

  unsigned short colormapLength;

  unsigned char  colormapSize;

  unsigned short xOrigin;

  unsigned short yOrigin;

  unsigned short width;

  unsigned short height;

  unsigned char  pixelSize;

  unsigned char  attributes;

} TgaHeader;

#pragma pack(pop)

int imageLoadTga(const char *path, int *outWidth, int *outHeight, unsigned char **pixels) {

  *outWidth = *outHeight = 0; *pixels = NULL;

	FILE *f = fopen(path, "rb");

	if (!f) {

    fprintf(stderr, "Cannot open for read: %s\n", path);

    fflush(stderr);

    return FALSE;

  }

	TgaHeader header = {};

	fread(&header, sizeof(header), 1, f); // todo: endianess

	//printf("%d %d %d %d %d\n", header.imageType, header.width, header.height, header.colormapType, header.pixelSize);

	if ( header.imageType != 2

	  || !header.width

	  || !header.height

	  || header.colormapType

	  || (header.pixelSize != 24 && header.pixelSize != 32)

  ) {

    fprintf(stderr, "Unsupported format. Only uncompressed 24 or 32 bits TGA are supported: %s\n", path);

    fflush(stderr);

    return FALSE;

	}

  fseek(f, header.idLength, SEEK_CUR);

  *outWidth = header.width;

  *outHeight = header.height;

  int rowSize = *outWidth*4;

  int size = *outHeight*rowSize;

  *pixels = (unsigned char*)calloc(1, size);

  unsigned char *row = *pixels + size;

  for(unsigned short r = header.height; r; --r, row -= rowSize) {

    for(unsigned char *c = row - rowSize; c < row; c += 4) {

      c[2] = fgetc(f);

      c[1] = fgetc(f);

      c[0] = fgetc(f);

      c[3] = header.pixelSize == 32 ? fgetc(f) : 255;

    }

  }

	fclose(f);

	return TRUE;

}

int imageSaveTga(const char *path, int width, int height, const unsigned char *pixels) {

  if (width <= 0 || height <= 0 || !pixels) return FALSE;

	FILE *f = fopen(path, "wb");

	if (!f) {

    fprintf(stderr, "Cannot open file for write: %s\n", path);

    fflush(stderr);

    return FALSE;

  }

	TgaHeader header = {};

	header.imageType = 2;

	header.width = width;

	header.height = height;

	header.pixelSize = 32;

	fwrite(&header, sizeof(header), 1, f); // todo: endianess

  int rowSize = width*4;

  int size = height*rowSize;

  const unsigned char *row = pixels + size;

  for(unsigned short r = header.height; r; --r, row -= rowSize) {

    for(const unsigned char *c = row - rowSize; c < row; c += 4) {

      fputc(c[2], f);

      fputc(c[1], f);

      fputc(c[0], f);

      fputc(c[3], f);

    }

  }

	fclose(f);

	return TRUE;

}