Programming

# identify -verbose 2010-12-21_09-21-29.jpg
Image: 2010-12-21_09-21-29.jpg
  Format: JPEG (Joint Photographic Experts Group JFIF format)
  Class: DirectClass
  Geometry: 320x240
  Type: TrueColor
  Endianess: Undefined
  Colorspace: RGB
  Channel depth:
    Red: 8-bits
    Green: 8-bits
    Blue: 8-bits
  Channel statistics:
    Red:
      Min: 0 (0)
      Max: 255 (1)
      Mean: 126.909 (0.497684)
      Standard deviation: 76.9182 (0.30164)
    Green:
      Min: 0 (0)
      Max: 208 (0.815686)
      Mean: 6.00544 (0.0235508)
      Standard deviation: 11.4396 (0.0448613)
    Blue:
      Min: 0 (0)
      Max: 255 (1)
      Mean: 8.88395 (0.034839)
      Standard deviation: 17.7563 (0.0696327)
  Colors: 1556
  Rendering intent: Undefined
  Resolution: 1029x1543
  Units: Undefined
  Filesize: 4.6kb
  Interlace: None
  Background color: white
  Border color: #DFDFDF
  Matte color: grey74
  Page geometry: 320x240+0+0
  Dispose: Undefined
  Iterations: 0
  Compression: JPEG
  Quality: 50
  Orientation: Undefined
  JPEG-Colorspace: 2
  JPEG-Sampling-factors: 2x2,1x1,1x1
  Signature: 7afd494edfe783dded28011ccd4d1405166cf6f193e1e58a0ec891ac53e2dc53
  Tainted: False
  Version: ImageMagick 6.2.8 10/20/10 Q16 file:/usr/share/ImageMagick-6.2.8/doc/index.html
identify: Corrupt JPEG data: 6 extraneous bytes before marker 0xc0 `2010-12-21_09-21-29.jpg'.
identify: Premature end of JPEG file `2010-12-21_09-21-29.jpg'.
identify: Corrupt JPEG data: premature end of data segment `2010-12-21_09-21-29.jpg'.

fd = open(DEVICE, O_RDWR | O_NOCTTY |O_NDELAY);
res = read(fd,buf, BUFSIZE);
buf[res] = 0;
parse(buf,res);

void parse(unsigned char *buff, size_t ss){
  // puts it into a buffer and sends each byte to fwrite
  for(i=0;i < ss ; i++){
    b = buff[i];
    // case statement here
    //when packet has data from jpeg send
    BlockW(&b); 
  }
}

void BlockW(unsigned char *b){
  FILE *fp;
  fp = fopen(filename, "ab");
  fwrite(b, sizeof(unsigned char), sizeof(unsigned char), fp);
  fclose(fp);
}

int fd = open(DEVICE, O_RDWR | O_NOCTTY |O_NDELAY);
int out=open("outfile", O_CREAT|O_WRONLY, 0660);

while(1)
{
        ssize_t off=0;
        ssize_t res = read(fd,buf, BUFSIZE);
        // Ignore when read didn't get anything
        if(res < 0)
                continue;
        else if(res == 0) // should your app expect EOF?
        {
                fprintf(stderr, "EOF?\n");
                break;
        }

        fprintf(stderr, "Read %d bytes\n", (int)res);
        // buf[res] = 0; why null-terminate what's not a string?
        //parse(buf,res); we're not in pascal anymore

        // We can probably write everything at once.  when we don't,
        // just write the bits that didn't get written yet.
        while(off < res)
        {
                ssize_t w=write(outfd, buf+off, res-off);
                if(w > 0)
                        off += w;
                else
                {
                        perror("write error");
                        break;
                }
                fprintf(stderr, "Wrote %d bytes\n", (int)w);
        }
}

close(out);
close(fd);