bmp2rgb.c

e1c0df5d-c8bc-48a5-bc02-a2b7c51c0dbf是做mp3的源代码

#include <stdio.h>

struct __attribute__((packed)) fh
{
unsigned short int bfType;
unsigned int bfSize;
unsigned short int  Res1;
unsigned short int  Res2;
unsigned int bfOffBits;
unsigned int biSize;
unsigned int biWidth;
unsigned int biHeight;
unsigned short int  biPlanes;
unsigned short int  biBitCount;
unsigned int biCompression;
unsigned int biSizeImage;
unsigned int biXPelsPerMeter;
unsigned int biYPelsPerMeter;
unsigned int biClrUsed;
unsigned int biClrImportant;
};


main (int argc, char **argv)

{
  static struct fh file_header, *fhp;

  FILE *fpr, *fpw;
  unsigned char colortable[0xff];
  unsigned char entry[0x04];
  unsigned char byte, colors;
  int i;

  fhp = &file_header;
  
  if (((fpr = fopen(argv[1], "r")) == NULL) || ((fpw = fopen(argv[2], "w")) == NULL))
    printf("Usage: bmp2rgb <bmpfile> <rgbfile>\n");
  else
    {
      byte = fread((char *) &file_header, sizeof(file_header), 1, fpr);
      printf("Bytes read: %d.\n", byte);
      printf("Image size: %d x %d.\n", file_header.biWidth, file_header.biHeight); 
      fseek(fpr, 0x36, 0);	// jump to color table
      if (file_header.biClrUsed == 0) colors = 0xff;
      else colors = file_header.biClrUsed;
      printf("Number of used colors: %d\n", colors);
      for (i=0; i<colors;i++)
      {
        fread(entry, 4, 1, fpr);
        colortable[i] = (entry[2] & 0xe0) | ((entry[1] & 0xe0) >> 3) | ((entry[0] & 0xe0) >> 6);
//        printf("%2x, %2x, %2x --> %2x\n", entry[0], entry[1], entry[2], colortable[i]);

      }
      fseek(fpr, file_header.bfOffBits, 0);	// jump to data area
      while (fread(&byte, 1, 1, fpr))
      {
//        printf("%2x,", byte);
        fputc(colortable[byte], fpw);
      }

      fclose(fpr);
      fclose(fpw);
    }
}