#include "config.h"#include "jbig2.h"#include "jbig2_priv.h"#include "jbig2_image.h"#include "jbig2_image_rw.h"#include <draw.h>#include <memdraw.h> static voidusage(void){	fprint(2, "usage: %s [-p PAGE]\n", argv0);	exits("usage");} voidmain(int argc, char **argv){    int n, w, h, x, y, page;	uchar *rgb, d[8192];	Jbig2Image *j;	Jbig2Ctx *ctx;	Memimage *m; 	page = 0;	ARGBEGIN{	case 'p':		page = atoi(EARGF(usage()));		break;	default:		usage();	}ARGEND 	if(argc != 0)		usage(); 	memimageinit(); 	if((ctx = jbig2_ctx_new(nil, 0, nil, nil, nil)) == nil){		werrstr("ctx_new");		goto error;	}	for(;;){		if((n = read(0, d, sizeof(d))) == 0)			break;		if(n < 0)			goto error;		if(jbig2_data_in(ctx, d, n) < 0){			werrstr("data_in");			goto error;		}	}	if(jbig2_complete_page(ctx) < 0){		werrstr("unable to complete page");		goto error;	} 	n = page;	while((j = jbig2_page_out(ctx)) != nil){		if(n > 1){			n--;			jbig2_release_page(ctx, j);			continue;		} 		w = j->width;		h = j->height;		if((rgb = malloc(j->stride*h)) == nil){			werrstr("memory");			goto error;		}		for(y = 0; y < h; y++){			memmove(rgb+y*j->stride, j->data+y*j->stride, j->stride);			for(x = 0; x < j->stride; x++)				rgb[y*j->stride+x] = ~rgb[y*j->stride+x];		}		jbig2_release_page(ctx, j); 		if((m = allocmemimage(Rect(0,0,w,h), GREY1)) == nil){			werrstr("memory");			goto error;		}		loadmemimage(m, m->r, rgb, w*h);		free(rgb);		writememimage(1, m);		freememimage(m); 		if(n == 1){			n--;			break;		}	}	if(n > 0){		werrstr("no page %d", page);		goto error;	} 	exits(nil);error:	fprint(2, "%r\n");	exits("error");}