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/* faces.c:
*
* faces format image loader
*
* jim frost 07.06.89
*
* Copyright 1989 Jim Frost.
* See included file "copyright.h" for complete copyright information.
*/
#include "copyright.h"
#include "image.h"
/* SUPPRESS 560 */
static short HexTable[256]; /* conversion value */
static unsigned int Initialized= 0; /* easier to fill in at run time */
#define HEXIGNORE -1
#define HEXBAD -2
/* build a hex digit value table with the bits inverted
*/
static void initHexTable()
{ int a;
for (a= 0; a < 256; a++)
HexTable[a]= HEXBAD;
HexTable['0']= 0x0;
HexTable['1']= 0x1;
HexTable['2']= 0x2;
HexTable['3']= 0x3;
HexTable['4']= 0x4;
HexTable['5']= 0x5;
HexTable['6']= 0x6;
HexTable['7']= 0x7;
HexTable['8']= 0x8;
HexTable['9']= 0x9;
HexTable['A']= 0xa; HexTable['a']= HexTable['A'];
HexTable['B']= 0xb; HexTable['b']= HexTable['B'];
HexTable['C']= 0xc; HexTable['c']= HexTable['C'];
HexTable['D']= 0xd; HexTable['d']= HexTable['D'];
HexTable['E']= 0xe; HexTable['e']= HexTable['E'];
HexTable['F']= 0xf; HexTable['f']= HexTable['F'];
HexTable['\r']= HEXIGNORE;
HexTable['\n']= HEXIGNORE;
HexTable['\t']= HEXIGNORE;
HexTable[' ']= HEXIGNORE;
Initialized = 1;
}
/* read a hex value and return its value
*/
static int nextInt(zf, len)
ZFILE *zf;
unsigned int len;
{ int c;
int value= 0;
int count;
len <<= 1;
for (count= 0; count < len;) {
c= zgetc(zf);
if (c == EOF)
return(-1);
else {
c= HexTable[c & 0xff];
switch(c) {
case HEXIGNORE:
break;
case HEXBAD:
return(-1);
default:
value= (value << 4) + c;
count++;
}
}
}
return(value);
}
Image *facesLoad(fullname, name, verbose)
char *fullname, *name;
{ ZFILE *zf;
Image *image;
char fname[BUFSIZ];
char lname[BUFSIZ];
char buf[BUFSIZ];
unsigned int w, h, d, iw, ih, id;
unsigned int x, y;
int value;
unsigned int linelen;
byte *lineptr, *dataptr;
if (!Initialized)
initHexTable();
if (! (zf= zopen(fullname)))
return(NULL);
w= h= d= 0;
fname[0]= lname[0]= '\0';
while (zgets((byte *)buf, BUFSIZ - 1, zf)) {
if (! strcmp(buf, "\n"))
break;
if (!strncmp(buf, "FirstName:", 10))
strcpy(fname, buf + 11);
else if (!strncmp(buf, "LastName:", 9))
strcpy(lname, buf + 10);
else if (!strncmp(buf, "Image:", 6)) {
if (sscanf(buf + 7, "%d%d%d", &iw, &ih, &id) != 3) {
printf("%s: Bad Faces Project image\n", fullname);
exit(1);
}
}
else if (!strncmp(buf, "PicData:", 8)) {
if (sscanf(buf + 9, "%d%d%d", &w, &h, &d) != 3) {
printf("%s: Bad Faces Project image\n", fullname);
exit(1);
}
}
}
if (!w || !h || !d) {
zclose(zf);
return(NULL);
}
znocache(zf);
if (verbose)
printf("%s is a %dx%d %d-bit grayscale Faces Project image\n",
name, w, h, d);
image= newRGBImage(w, h, d);
fname[strlen(fname) - 1]= ' ';
strcat(fname, lname);
fname[strlen(fname) - 1]= '\0';
image->title= dupString(fname);
/* image is greyscale; build RGB map accordingly
*/
for (x= 0; x < image->rgb.size; x++)
*(image->rgb.red + x)= *(image->rgb.green + x)= *(image->rgb.blue + x)=
(65536 / image->rgb.size) * x;
image->rgb.used= image->rgb.size;
/* read in image data
*/
linelen= w * image->pixlen;
lineptr= image->data + (h * linelen);
for (y= 0; y < h; y++) {
lineptr -= linelen;
dataptr= lineptr;
for (x= 0; x < w; x++) {
if ((value= nextInt(zf, image->pixlen)) < 0) {
printf("%s: Bad Faces Project image data\n", fullname);
exit(1);
}
*(dataptr++)= value;
}
}
zclose(zf);
return(image);
}
int facesIdent(fullname, name)
char *fullname, *name;
{ Image *image;
if (image= facesLoad(fullname, name, 1)) {
freeImage(image);
return(1);
}
return(0);
}
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