Right-hand 90 degrees of BMP files [C Language]

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Typedef unsigned short WORD; typedef unsigned int DWORD; typedef unsigned int LONG; # pragma pack (2) typedef struct tagBITMAPFILEHEADER {WORD bfType; DWORD bfSize; WORD bfReserved1; WORD bfReserved2; DWORD merge;} BITMAPFILEHEADER; # pragma pack () typedef struct tagBITMAPINFOHEADER {DWORD biSize; LONG biWidth; LONG biHeight; WORD biPlanes; WORD biBitCount; DWORD biCompression; DWORD biSizeImage; LONG history; LONG biYPelsPerMeter; DWORD biClrUsed; DWORD biClrImportant;} BITMAPINFOHEADER;/* fname-input file name foname-output file name */void cw90 (char * fname, char * foname) {BITMAPFILEHEADER fileHeader; BITMAPINFOHEADER infoHeader; unsigned char palette [8]; FILE * f = fopen (fname, "rb"); if (f = NULL) {printf ("Can not find file % s \ n", fname); return;} fread (& fileHeader, sizeof (BITMAPFILEHEADER), 1, f); fread (& infoHeader, sizeof (BITMAPINFOHEADER), 1, f); fread (palette, sizeof (unsigned char), 8, f); unsigned char * data = (unsigned char *) malloc (infoHeader. biSizeImage); fread (data, sizeof (unsigned char), infoHeader. biSizeImage, f); FILE * of = fopen (foname, "wb"); BITMAPFILEHEADER oFileHeader; BITMAPINFOHEADER oInfoHeader; int lineSize = (infoHeader. biHeight + 31)/32*4; int imageSize = lineSize * infoHeader. biWidth; // oFileHeader. bfType = 19778; oFileHeader. bfSize = 62 + imageSize; oFileHeader. bfReserved1 = 0; oFileHeader. bfReserved2 = 0; oFileHeader. bfOffBits = 62; // oInfoHeader. biSize = 40; oInfoHeader. biWidth = infoHeader. biHeight; oInfoHeader. biHeight = infoHeader. biWidth; oInfoHeader. biPlanes = 1; oInfoHeader. biBitCount = 1; oInfoHeader. biCompression = 0; oInfoHeader. biSizeImage = imageSize; oInfoHeader. biXPelsPerMeter = 0; oInfoHeader. biYPelsPerMeter = 0; oInfoHeader. biClrUsed = 0; oInfoHeader. biClrImportant = 0; // fwrite (& oFileHeader, sizeof (BITMAPFILEHEADER ), 1, of); fwrite (& oInfoHeader, sizeof (BITMAPINFOHEADER), 1, of); fwrite (palette, 1, 8, ); unsigned char * first = (unsigned char *) malloc (infoHeader. biHeight * oInfoHeader. biHeight); unsigned char * second = (unsigned char *) malloc (infoHeader. biHeight * oInfoHeader. biHeight); int myline = oInfoHeader. biSizeImage/oInfoHeader. biHeight; unsigned char * third = (unsigned char *) malloc (myline * 8 * oInfoHeader. biHeight); unsigned char * forth = (unsigned char *) malloc (myline * oInfoHeader. biHeight); unsigned char * img = (unsigned char *) malloc (oInfoHeader. biSizeImage); // first step int I, j, k, t =-1; int temp = infoHeader. biSizeImage/infoHeader. biHeight; for (I = 0; I <infoHeader. biHeight; I ++) {for (j = 0; j <temp; j ++) {for (k = 0; k <8; k ++) {if (j * 8 + k <oInfoHeader. biHeight) {first [++ t] = data [I * temp + j] >>( 8-1-k) & 1 ;}}}} // second step // rotate t =-1; for (I = 0; I <oInfoHeader. biHeight; I ++) {for (j = 0; j <infoHeader. biHeight; j ++) {second [++ t] = first [oInfoHeader. biHeight * j + oInfoHeader. biHeight-I-1] ;}/// step three // fill with 0's t =-1; for (I = 0; I <oInfoHeader. biHeight; I ++) {for (j = 0; j <infoHeader. biHeight; j ++) {third [++ t] = second [I * infoHeader. biHeight + j];} for (k = infoHeader. biHeight; k <myline * 8; k ++) {third [++ t] = 0 ;}// step four // transfer int u =-1; int m =-1; for (I = 0; I <oInfoHeader. biHeight; I ++) {for (j = 0; j <myline * 8; j ++) {int sum = 0; for (k = 0; k <8; k ++) {sum + = pow (-k-1) * third [++ m % t];} forth [++ u] = sum;} fwrite (forth, 1, myline * oInfoHeader. biHeight, of); free (img); free (data); fclose (f); fclose (of);} int main () {cw90 ("original.bmp ", "ttt.bmp"); system ("pause"); return 0 ;}
   
  
 

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If a running failure occurs on windows, you can change typedef unsigned int LONG to typedef unsigned long LONG.

[The above Code applies to a monochrome BMP file] (biBitCount = 1)