[완료]frame buffer 에서 덤프뜬 16bit raw 를 24bit 로 변환하는 문제

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
 
#define WIDTH 	320
#define HEIGHT 	240
 
struct RGB{
	unsigned char red;
	unsigned char green;
	unsigned char blue;
} __attribute__ ((packed));
 
struct BGR{
	unsigned char blue;
	unsigned char green;
	unsigned char red;
} __attribute__ ((packed));
 
void help(void);
 
unsigned short int getRED(unsigned short int pixel);
unsigned short int getGREEN(unsigned short int pixel);
unsigned short int getBLUE(unsigned short int pixel);
 
int main(int argc, char *argv[])
{
	int readFD;
	int writeFD;
	int ret;
	int i;
	int c16BitSize;
	int c24BitSize;
	unsigned short int c16BitBuf[WIDTH * HEIGHT];
	struct RGB RGB[WIDTH * HEIGHT];
	struct BGR BGR[WIDTH * HEIGHT];
 
	if(argc != 3){
		help();
		exit(-1);
	}
 
	fprintf(stdout, "read file open [ %s ]\n", argv[1]);
	readFD = open(argv[1], O_RDONLY);
	if(readFD < 0){
		fprintf(stderr, "16Bit soure file open fail\n");
		fprintf(stderr, "check filename\n");
		exit(-1);
	}
 
	fprintf(stdout, "write file open [ %s ]\n", argv[2]);
	writeFD = open(argv[2], O_WRONLY|O_CREAT|O_TRUNC, S_IRUSR|S_IWUSR|S_IXUSR|S_IRGRP|S_IWGRP|S_IXGRP|S_IROTH|S_IWOTH|S_IXOTH);
	if(writeFD < 0){
		fprintf(stderr, "24Bit dest file open fail\n");
		fprintf(stderr, "check filename\n");
		exit(-1);
	}
 
	/* 각 색상수별로 크기 알아내기 */
	c16BitSize = sizeof(c16BitBuf);
	c24BitSize = sizeof(RGB);
 
	/* 원본 덤프 파일 읽기 */
	ret = read(readFD, c16BitBuf, c16BitSize);
 
	if(ret < c16BitSize) {
		fprintf(stderr, "16Bit raw file read error\n");
		exit(-1);
	} else {
		fprintf(stdout, "read size %d\n", ret);
	}
 
	/* 원본 16bit raw 를 24bit raw 로 확장함 */
 
	for(i=0; i < WIDTH * HEIGHT; i++)
	{
		RGB[i].red = getRED(c16BitBuf[i]);
		RGB[i].green = getGREEN(c16BitBuf[i]);
		RGB[i].blue = getBLUE(c16BitBuf[i]);
	}
 
	ret = write(writeFD, RGB, sizeof(RGB));
 
	return 0;
}
 
void help(void)
{
	fprintf(stderr, " Ver. 1.0\n\n");
	fprintf(stderr, " useage\n");
	fprintf(stderr, "   16BitRawTo24BitRaw [16bit Raw file] [24bit Raw file]\n\n");
}
 
 
/* 16Bit raw 에서 RED pixel 정보를 추출한다. */
unsigned short int getRED(unsigned short int pixel) 
{ 
	return (unsigned short int)pixel >> 11;
}
 
/* 16Bit raw 에서 GREEN pixel 정보를 추출한다. */
unsigned short int getGREEN(unsigned short int pixel) 
{ 
	return (unsigned short int)((pixel & 0x7E0) >> 5);
}
 
/* 16Bit raw 에서 BLUE pixel 정보를 추출한다. */
unsigned short int getBLUE(unsigned short int pixel)
{
	return (unsigned short int)(pixel & 0x1F);
}

=========================================
       FRAME BUFFER INFOMATION
=========================================
 
 = Resolution information =
    X - resolution :  800
    Y - resolution :  480
    X - resolution(virtual) :  800
    Y - resolution(virtual) :  480
    BPP :   16
    length of frame buffer memory : 768000
 
 = RGB pixel infomation =
    RED info
      length :    5
      offset :   11
 
    GREEN info
      length :    6
      offset :    5
 
    BLUE info
      length :    5
      offset :    0