纯c实现bmp转化jpg

#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <linux/videodev.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include <signal.h>
#include <sys/timeb.h>
#include <jpeglib.h>
 
#define JPEG_QUALITY 95 //图片质量
 
int Bmp2Jpg(const char *bmp_file, const char *jeg_file, const int width, const int height)
{
    FILE *fd;
    int ret;
    unsigned char *data;
    long sizeImage;
    int depth = 3;
    JSAMPROW * row_pointer;
    long rgb_index = 0;
    int i=0;
    struct jpeg_compress_struct cinfo;
    struct jpeg_error_mgr jerr;
    FILE *outfile;