filbuf.c
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/*
* ifilbuf -
*
* Paul Haeberli - 1984
*
*/
#include "image.h"
int ifilbuf(IMAGE *image)
{
int size;
if ((image->flags&_IOREAD) == 0)
return(EOF);
if (image->base==NULL) {
size = IBUFSIZE(image->xsize);
if ((image->base = ibufalloc(image)) == NULL) {
i_errhdlr("can't alloc image buffer\n");
return EOF;
}
}
image->cnt = getrow(image,image->base,image->y,image->z);
image->ptr = image->base;
if (--image->cnt < 0) {
if (image->cnt == -1) {
image->flags |= _IOEOF;
if (image->flags & _IORW)
image->flags &= ~_IOREAD;
} else
image->flags |= _IOERR;
image->cnt = 0;
return -1;
}
if(++image->y >= image->ysize) {
image->y = 0;
if(++image->z >= image->zsize) {
image->z = image->zsize-1;
image->flags |= _IOEOF;
return -1;
}
}
return *image->ptr++ & 0xffff;
}