affcompare.cpp
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affcompare.cpp
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	/*
	* acompare.cpp:
	*
	* Compare the contents of an ISO file to an AFF file.
	* Optionally, if they are equal, delete the ISO file
	*/

	/*
	* Copyright (c) 2005--2008
	* Simson L. Garfinkel and Basis Technology, Inc.
	* All rights reserved.
	*
	* This code is derrived from software contributed by
	* Simson L. Garfinkel
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	* 1. Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* 2. Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in the
	* documentation and/or other materials provided with the distribution.
	* 3. All advertising materials mentioning features or use of this software
	* must display the following acknowledgement:
	* This product includes software developed by Simson L. Garfinkel
	* and Basis Technology Corp.
	* 4. Neither the name of Simson Garfinkel, Basis Technology, or other
	* contributors to this program may be used to endorse or promote
	* products derived from this software without specific prior written
	* permission.
	*
	* THIS SOFTWARE IS PROVIDED BY SIMSON GARFINKEL, BASIS TECHNOLOGY,
	* AND CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
	* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
	* DISCLAIMED. IN NO EVENT SHALL SIMSON GARFINKEL, BAIS TECHNOLOGy,
	* OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
	* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
	* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
	* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
	* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	* SUCH DAMAGE.
	*/

	#include "affconfig.h"
	#include "afflib.h"
	#include "afflib_i.h"
	#include "utils.h"

	using namespace std;
	using namespace aff;


	#ifdef WIN32
	#include "unix4win32.h"
	#endif


	#ifdef UNIX
	#include <sys/signal.h>
	#include <unistd.h>
	#endif

	#include <ctype.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <sys/types.h>
	#include <sys/stat.h>
	#include <fcntl.h>
	#include <limits.h>
	#include <string.h>
	#include <zlib.h>
	#include <openssl/md5.h>
	#include <openssl/sha.h>
	#include <assert.h>

	#ifdef HAVE_CSTRING
	#include <cstring>
	#endif

	#ifdef linux
	#include <sys/time.h>
	#endif



	const char *progname = "affcompare";

	int opt_quiet = 0;
	int opt_all = 0;
	int opt_print_sectors = 0;
	int opt_print_sector_contents = 0;
	int opt_page = -1;
	int opt_preen = 0;
	int opt_exist = 0;
	int opt_ignore_metadata = 0;
	int opt_s3 = 0;
	int opt_verbose = 0;
	const char *batch_ext = "";

	vector<string> errors;

	const char *current_source = 0;

	void sig_info(int arg)
	{
	if(current_source){
	printf("%s... ",current_source);
	}
	printf("\n");
	fflush(stdout);
	}

	void print_title(char *title)
	{
	if(title[0]){
	puts(title);
	title[0] = 0;
	}
	}

	void usage()
	{
	printf("affcompare version %s\n",PACKAGE_VERSION);
	printf("\n");
	printf("usage: affcompare [options] file1 file2\n");
	printf(" compares file1 with file2\n");
	printf("\n");
	printf("or affcompare [options] -r dir1 dir2\n");
	printf(" comparses similarly-named files in dir1 and dir2\n");
	printf("\n");
	printf("or affcompare [options] -s file1 file2...\n");
	printf(" Reports if file was successfully copied to Amazon S3\n");
	printf(" checking only for existence, not reading back the bytes.\n");
	printf(" (Because all writes to S3 are validated by the MD5 of the object\n");
	#ifndef USE_S3
	printf(" NOTE: S3 support is not provided in this version\n");
	#endif

	printf("fast options:\n");
	printf("(These compare segments but not their contents.)\n");
	printf(" -p --- report about the results of preening\n");
	printf(" -e --- Just report about existence (use with -r)\n");
	printf(" -s --- Just see if all of the segments are present, but don't\n");
	printf(" validate the contents. (Primarily for use with Amazon S3)\n");

	printf("other options:\n");
	printf(" -V --- just print the version number and exit\n");
	printf(" -v --- Verbose; each file as it is compared.\n");
	printf(" -q --- Quiet. No output except for errors\n");
	printf(" -a --- print what's the same (all)\n");
	printf(" -b --- print the numbers of differing sectors\n");
	printf(" -c --- print the contents of differing sectors\n");
	printf(" -m --- Just report about the data (ignore metadata)\n");
	printf(" -P ### --- Just examine the differences on page ###\n");
	printf(" -q --- Quiet; no output except for errors.\n");
	printf("\n");
	printf("Options documented above:\n");
	printf(" -r dir1 dir2 --- recursively compare what's in dir1 with dir2, and\n");
	printf(" report what's in dir1 that's not in dir2\n");
	printf(" -s --- Check to see if named files are on Amazon S3\n");
	printf("\n");
	printf(" affcompare file1.aff file2.aff --- compare file1.aff and file2.aff\n");
	printf(" affcompare f1.aff f2.aff dir1/ --- compare f1.aff with dir1/f1.aff and f2.aff with dir2/f2.aff\n");
	printf(" note: dir1/ must end with a slash.\n");
	printf(" affcompare -b img file.aff --- compare file.aff and file.img\n");
	printf(" affcompare -b img file1.aff file2.aff... --- compare file1.aff, file1.img, etc.\n");
	printf(" affcompare -re dir1 dir2 --- report AFF files in dir1 but not in dir2\n");
	printf(" affcompare -rse dir1 s3:/// --- report AFF files in dir1 but not on S3 (low bandwidth)\n");
	printf(" affcompare -rs dir1 s3:/// --- report AFF files in dir1 but incomplete on on S3 (more bandwidth)\n");
	printf("\n");
	exit(0);
	}

	void print_sector(AFFILE af,unsigned char buf)
	{
	for(unsigned int i=0;i<af->image_sectorsize;i++){
	if(isprint(buf[i])){
	putchar(buf[i]);
	}
	else {
	putchar('.');
	}
	if(i%64==63) putchar('\n');
	}
	}


	void print_info(char dir,const char *segname,unsigned long arg,size_t len,
	unsigned char *data,int mcr)
	{
	printf(" %c %s arg=%lu len=%d\n",dir,segname,arg,(int)len);
	printf(" ");
	if((arg == AF_SEG_QUADWORD) && (len==8)){
	printf("data=%"I64d" as a 64-bit value\n",af_decode_q(data));
	return;
	}
	/* Otherwise, just print some stuff... */
	for(unsigned int i=0;i<len && i<60;i++){
	if(data[i]==' '){
	putchar(' ');
	continue;
	}
	if(!isprint(data[i])){
	putchar('.');
	continue;
	}
	putchar(data[i]);
	}
	putchar('\n');
	}

	int compare_aff_metadata_segments(char title,AFFILE af1,AFFILE af2,const char segname,int mode)
	{
	int ret = 0;

	unsigned long arg1 = 0;
	size_t data1_len = 0;
	int r1 = af_get_seg(af1,segname,&arg1,0,&data1_len);

	unsigned long arg2 = 0;
	size_t data2_len = 0;
	int r2 = af_get_seg(af2,segname,&arg2,0,&data2_len);

	if(r1==0 && r2!=0){
	if(mode==1){
	print_title(title);
	printf(" %s \n",segname);
	}
	return 1;
	}

	if(r1!=0 && r2==0){
	if(mode==2){
	print_title(title);
	printf(" %s \n",segname);
	}
	return 1;
	}
	if(mode!=3) return 0; // only report differences in mode 3
	/* Get the actual data... */

	unsigned char data1 = (unsigned char )malloc(data1_len);
	unsigned char data2 = (unsigned char )malloc(data2_len);

	int s1 = af_get_seg(af1,segname,&arg1,data1,&data1_len);
	if(s1!=0) err(1,"Couldn't read data segment %s in %s",segname,af_filename(af1));

	int s2 = af_get_seg(af2,segname,&arg2,data2,&data2_len);
	if(s2!=0) err(1,"Couldn't read data segment %s in %s",segname,af_filename(af2));

	int mcr = 0;

	if(data1_len != data2_len) mcr = 1;
	else mcr = memcmp(data1,data2,data1_len);
	if(arg1!=arg2 \|\| data1_len!=data2_len \|\| mcr!=0){
	print_title(title);
	print_info('<',segname,arg1,data1_len,data1,mcr);
	print_info('>',segname,arg2,data2_len,data2,mcr);
	if(mcr){
	printf(" *** Metadata segment are different ");
	if(strcmp(segname,AF_BADFLAG)==0){
	printf("(bad flags should be different!)");
	}
	putchar('\n');
	}
	putchar('\n');
	ret = 1;
	}
	else {
	if(opt_all){
	print_title(title);
	printf(" %s (same in both) \n",segname);
	}
	}
	free(data1);
	free(data2);
	return ret;
	}

	int compare_aff_data_segments(char title,AFFILE af1,AFFILE *af2,int64_t pagenum,int mode)
	{
	int ret = 0;
	char pagename[65];
	snprintf(pagename,sizeof(pagename),AF_PAGE,pagenum);

	char segname[65];
	snprintf(segname,sizeof(segname),AF_SEG_D,pagenum);

	unsigned long arg1=0;
	size_t data1_len=0;
	int r1 = af_get_seg(af1,pagename,&arg1,0,&data1_len);
	if(r1==-1) r1=af_get_seg(af1,segname,&arg1,0,&data1_len);

	unsigned long arg2=0;
	size_t data2_len=0;
	int r2 = af_get_seg(af2,pagename,&arg2,0,&data2_len);
	if(r2 == -1) r2=af_get_seg(af2,segname,&arg2,0,&data2_len);

	if(r1<0 && r2<0) return 0; // no data segment in either file
	if(r1==0 && r2!=0){
	if(mode==1){
	print_title(title);
	printf(" %s \n",pagename);
	}
	return 1;
	}

	if(r2==0 && r1!=0){
	if(mode==2){
	print_title(title);
	printf(" %s \n",pagename);
	}
	return 1;
	}
	if(mode!=3) return 0; // only report differences in mode 3

	/* Get the actual data... */
	unsigned char data1 = (unsigned char )malloc(af_page_size(af1));
	unsigned char data2 = (unsigned char )malloc(af_page_size(af2));

	data1_len = af_page_size(af1);
	data2_len = af_page_size(af2);

	uint64_t start_sector_number = (pagenum * data1_len) / af1->image_sectorsize;

	/* Find the size of each page, then get the page */
	if(af_get_page(af1,pagenum,0,&data1_len)<0)
	err(1,"Cannot read page %"I64d" size from %s\n",pagenum,af_filename(af1));
	if(af_get_page(af1,pagenum,data1,&data1_len)<0)
	err(1,"Cannot read page %"I64d" from %s",pagenum,af_filename(af1));

	if(af_get_page(af2,pagenum,0,&data2_len)<0)
	err(1,"Cannot read page %"I64d" size from %s\n",pagenum,af_filename(af2));
	if(af_get_page(af2,pagenum,data2,&data2_len)<0)
	err(1,"Cannot read page %"I64d" from %s",pagenum,af_filename(af2));

	if(data1_len != data2_len){
	printf("page %"I64d" size %zd != size %zd\n",pagenum,data1_len,data2_len);
	return 1;
	}

	/* Now look at the pages sector-by-sector. */
	int af1_bad=0;
	int af2_bad=0;
	int matching_bad_sectors = 0;
	int matching_sectors = 0;
	int total_sectors = 0;
	int no_match = 0;
	vector<uint64_t> different_sectors;

	for(unsigned int offset=0;offset<data1_len;offset+=af1->image_sectorsize){
	uint64_t this_sector = start_sector_number + offset/af1->image_sectorsize;
	total_sectors++;
	if(af_is_badsector(af1,data1+offset) &&
	af_is_badsector(af2,data2+offset)){
	matching_bad_sectors++;
	continue;
	}
	if(af_is_badsector(af1,data1+offset)){
	af1_bad++;
	continue;
	}
	if(af_is_badsector(af2,data2+offset)){
	af2_bad++;
	continue;
	}
	if(memcmp(data1+offset,data2+offset,af1->image_sectorsize)==0){
	matching_sectors++;
	continue;
	}
	no_match++;
	different_sectors.push_back(this_sector);
	}

	char outline[256];
	outline[0] = 0;
	if(opt_all \|\| (no_match>0) \|\| af1_bad \|\| af2_bad){
	snprintf(outline,sizeof(outline),
	" page%"I64d" sectors:%4d matching: %3d different:%3d",
	pagenum,total_sectors,matching_sectors,no_match);
	}
	if(af1_bad){
	snprintf(outline+strlen(outline),sizeof(outline)-strlen(outline),
	" file 1 bad: %3d ",af1_bad);
	}
	if(af2_bad){
	snprintf(outline+strlen(outline),sizeof(outline)-strlen(outline),
	" file 2 bad: %3d ",af2_bad);
	}
	if(matching_bad_sectors){
	if(opt_all){
	snprintf(outline+strlen(outline),sizeof(outline)-strlen(outline),
	" bad both:%3d ",matching_bad_sectors);
	}
	}

	if(outline[0]){
	print_title(title);
	puts(outline);
	}
	if(opt_print_sectors && different_sectors.size()>0){
	print_title(title);
	printf(" Sectors with differences:");
	int i=0;
	for(vector<uint64_t>::iterator j = different_sectors.begin();
	j != different_sectors.end();
	j++){
	if(i==0){
	printf("\n ");
	}
	printf(" %"I64d,*j);
	i = (i+1) % 10;
	}
	putchar('\n');
	ret = 1;
	}
	if(opt_print_sector_contents && different_sectors.size()>0){
	print_title(title);
	printf(" Sectors with differences:");
	for(vector<uint64_t>::iterator j = different_sectors.begin();
	j != different_sectors.end(); j++){
	int offset = (j - start_sector_number)af1->image_sectorsize;
	char b2[16];
	printf("offset=%d\n",offset);

	memcpy(b2,data1+offset,16);
	b2[15]=0;

	printf("=== sector %"I64d" (offset=%d) ===\n",*j,offset);
	printf(" %s:\n",af_filename(af1));
	print_sector(af1,data1+offset);
	printf("-------------------------------------\n");
	printf(" %s:\n",af_filename(af2));
	print_sector(af2,data2+offset);
	printf("=====================================\n\n");
	}
	ret = 1;
	}
	free(data1);
	free(data2);
	return ret;
	}

	/* Compare the results of two files that were preened */
	int compare_preen(AFFILE af1,AFFILE af2)
	{
	vector<int64_t> pages;
	int comp_zero=0;
	int comp_lzma=0;
	int comp_unchanged=0;
	uint64_t bytes_old = 0;
	uint64_t bytes_new = 0;

	af_rewind_seg(af1);
	/* Build a list of all the pages */
	char segname[AF_MAX_NAME_LEN];
	while(af_get_next_seg(af1,segname,sizeof(segname),0,0,0)==0){
	int64_t pagenumber = af_segname_page_number(segname);
	if(pagenumber>=0) pages.push_back(pagenumber);
	}
	/* Now, compare each one */
	for(vector<int64_t>::const_iterator i = pages.begin(); i != pages.end(); i++){
	unsigned long arg1,arg2;
	size_t len1,len2;

	if(af_get_page_raw(af1,*i,&arg1,0,&len1)){
	err(1,"Could not read page %"I64d" in file %s\n",*i,af_filename(af1));
	}
	if(af_get_page_raw(af2,*i,&arg2,0,&len2)){
	err(1,"Page %"I64d" is in file %s but not in %s\n",*i,af_filename(af1),
	af_filename(af2));
	}
	if(arg1==arg2 && len1==len2){
	comp_unchanged++;
	continue;
	}
	if((arg2 & AF_PAGE_COMP_ALG_MASK)==AF_PAGE_COMP_ALG_ZERO){
	comp_zero++;
	continue;
	}
	if((arg2 & AF_PAGE_COMP_ALG_MASK)==AF_PAGE_COMP_ALG_LZMA){
	comp_lzma++;
	bytes_old += len1;
	bytes_new += len2;
	continue;
	}
	}
	printf("%s -> %s Nochg: %d NUL: %d LZMA: %d old: %"I64d" new: %"I64d" LZred: %6.2f%%\n",
	af_filename(af1),
	af_filename(af2),
	comp_unchanged,comp_zero,comp_lzma,bytes_old,bytes_new,(bytes_old-bytes_new)*100.0/bytes_old);
	return 0;
	}


	/* Compare two AFF files.
	* Return 0 if they are equal.
	*/
	int compare_aff_aff(const char file1,const char file2)
	{
	bool no_data_segments = false;
	int ret = 0;

	current_source = file1;

	if(opt_all) printf("compare %s and %s:\n",file1,file2);

	AFFILE *af1 = af_open(file1,O_RDONLY,0);
	if(!af1) af_err(1,"af_open(%s)",file1);

	AFFILE *af2 = af_open(file2,O_RDONLY,0);
	if(!af2) af_err(1,"af_open(%s)",file2);

	af_vnode_info vni1,vni2;

	if(af_vstat(af1,&vni1) \|\| af_vstat(af2,&vni2)){
	err(1,"af_vstat failed?");
	}

	if(af_cannot_decrypt(af1) != af_cannot_decrypt(af2)){
	printf("%s: %s decrypt\n",file1,af_cannot_decrypt(af1) ? "cannot" : "can");
	printf("%s: %s decrypt\n",file2,af_cannot_decrypt(af2) ? "cannot" : "can");
	fprintf(stderr,"affcompare must be able to decrypt both files or neither of the files.\n");
	exit(1);
	}

	if(af1->image_pagesize != af2->image_pagesize){
	fprintf(stderr,"Currently, %s requires that both images have the "
	"same image datsegsize.\n"
	"pagesize(%s)=%ld\n"
	"pagesize(%s)=%ld\n",
	progname,file1,af1->image_pagesize,
	file2,af2->image_pagesize);
	fprintf(stderr,"Data segments will be ignored.\n");
	no_data_segments = true;
	}

	if(af1->image_sectorsize != af2->image_sectorsize){
	fprintf(stderr,"Currently, %s requires that both images have the "
	"same image sectorsize.\n"
	"sectorsize(%s)=%ld\n"
	"sectorsize(%s)=%ld\n",
	progname,file1,af1->image_sectorsize, file2,af2->image_sectorsize);
	fprintf(stderr,"Data segments will be ignored.\n");
	no_data_segments = true;
	}

	if(opt_preen){
	compare_preen(af1,af2);
	af_close(af1);
	af_close(af2);
	return 0;
	}

	if(opt_s3){
	printf("bypass\n");
	seglist list1(af1);
	seglist list2(af2);

	/* Just compare the presence/absence of each segment */
	char title[1024];
	snprintf(title,sizeof(title),"\nPresent in %s but not %s:",af_filename(af1),af_filename(af2));
	for(seglist::const_iterator i=list1.begin(); i!=list1.end(); i++){
	if(find(list2.begin(),list2.end(),*i)==list2.end()){
	print_title(title);
	printf(" %s\n",(*i).name.c_str());
	}
	}
	snprintf(title,sizeof(title),"\nPresent in %s but not %s:",af_filename(af2),af_filename(af1));
	for(seglist::const_iterator i=list2.begin(); i!=list2.end(); i++){
	if(find(list1.begin(),list1.end(),*i)==list1.end()){
	print_title(title);
	printf(" %s\n",(*i).name.c_str());
	}
	}
	return 0;
	}

	/* Compare all of the metadata segments in af1 with a2.
	* Report those that are missing or different. Then report
	* all of the segments in a2 but not in af1
	*/

	/* First build a list of the segments in each */

	vector <string> segs_with_dups;

	AFFILE *af[2] = {af1,af2};
	for(int i=0;i<2;i++){
	if(opt_verbose) printf("\n%s:\n",af_filename(af[i]));
	af_rewind_seg(af[i]);
	char segname[AF_MAX_NAME_LEN];
	while(af_get_next_seg(af[i],segname,sizeof(segname),0,0,0)==0){
	if(segname[0]){
	string s;
	s = segname;
	segs_with_dups.push_back(s); // may give duplicates
	if(opt_verbose) printf(" %s\n",segname);
	}
	}
	}
	sort(segs_with_dups.begin(),segs_with_dups.end());
	vector<string>segs;

	/* Make a list of segs without duplicates */
	string last;
	for(vector<string>::iterator i = segs_with_dups.begin();
	i != segs_with_dups.end(); i++){
	if(last != *i){
	segs.push_back(*i);
	}
	last = *i;
	}

	int lowest_page = -1;
	int highest_page = -1;
	/* Scan for the lowest and highest numbers */
	for(vector<string>::iterator i = segs.begin();i != segs.end(); i++){
	int64_t num = af_segname_page_number(i->c_str());
	if(num!=-1){
	if(num<lowest_page \|\|lowest_page==-1) lowest_page = num;
	if(num>highest_page\|\|highest_page==-1) highest_page = num;
	}
	}


	if(opt_page != -1){
	lowest_page = opt_page;
	highest_page = opt_page;
	}


	if(opt_page == -1
	&& vni1.supports_metadata
	&& vni2.supports_metadata
	&& opt_ignore_metadata==0 ){
	if(opt_all) puts("Inspecting metadata...");
	for(int mode=1;mode<=3;mode++){
	const char *title = "Metadata segments ";
	char mode_title[1024];
	switch(mode){
	case 1:
	snprintf(mode_title,sizeof(mode_title)," %s only in %s:\n",
	title,af_filename(af1));
	break;
	case 2:
	snprintf(mode_title,sizeof(mode_title)," %s only in %s:\n",
	title,af_filename(af2));
	break;
	case 3:
	snprintf(mode_title,sizeof(mode_title)," %s in both files:\n",title);
	break;
	}

	for(vector<string>::iterator i = segs.begin();i != segs.end();i++){
	int64_t num = af_segname_page_number(i->c_str());
	if(num==-1){
	int r = compare_aff_metadata_segments(mode_title, af1,af2,
	i->c_str(),mode);
	if(r!=0) ret = r;
	}
	}
	}
	}

	if(no_data_segments==false){
	if(opt_all) puts("Inspecting data...");
	for(int mode=1;mode<=3;mode++){
	char mode_title[1024];
	switch(mode){
	case 1: snprintf(mode_title,sizeof(mode_title),
	" Pages only in %s:\n", af_filename(af1));break;
	case 2: snprintf(mode_title,sizeof(mode_title),
	" Pages only in %s:\n", af_filename(af2));break;
	case 3: snprintf(mode_title,sizeof(mode_title)," Pages in both files:\n");break;
	}

	for(int i=lowest_page;i<=highest_page;i++){
	int r = compare_aff_data_segments(mode_title,af1,af2,i,mode);
	if(r!=0) ret = r;
	}
	}
	}
	current_source = 0;
	#ifdef HAVE_ISATTY
	if(ret==0 && isatty(fileno(stdout))) printf("%s and %s: files compare okay\n",file1,file2);
	#endif
	return ret;
	}

	int recurse(const char dir1,const char dir2)
	{
	vector<string> only_in_dir1;

	DIR *dirp = opendir(dir1);
	struct dirent *dp;
	if(!dirp) err(1,"opendir: %s",dir1);
	while ((dp = readdir(dirp)) != NULL){

	char fn1[MAXPATHLEN+1]; memset(fn1,0,sizeof(fn1));
	char fn2[MAXPATHLEN+1]; memset(fn2,0,sizeof(fn2));

	strlcpy(fn1,dir1,sizeof(fn1));
	if(fn1[strlen(fn1)-1]!='/') strlcat(fn1,"/",sizeof(fn1));
	strlcat(fn1,dp->d_name,sizeof(fn1));

	current_source = fn1;
	if(opt_verbose) printf("%s...\n",fn1);

	switch(af_identify_file_type(fn1,1)){
	case AF_IDENTIFY_ERR:
	case AF_IDENTIFY_NOEXIST:
	only_in_dir1.push_back(fn1);
	break;
	case AF_IDENTIFY_AFF:
	case AF_IDENTIFY_AFD:
	case AF_IDENTIFY_AFM:
	strlcpy(fn2,dir2,sizeof(fn2));
	if(fn2[strlen(fn2)-1]!='/') strlcat(fn2,"/",sizeof(fn2));
	strlcat(fn2,dp->d_name,sizeof(fn2));
	if(af_identify_file_type(fn2,1)<0){
	char buf[1024];
	snprintf(buf,sizeof(buf),"%s not in %s\n",dp->d_name,dir2);
	errors.push_back(buf);
	break;
	}
	if(opt_exist==0){
	compare_aff_aff(fn1,fn2);
	}
	break;
	default:
	break;
	}
	}
	closedir(dirp);
	printf("========================\n");
	printf("Only in %s\n",dir1);
	for(vector<string>::const_iterator i = only_in_dir1.begin();
	i != only_in_dir1.end();
	i++){
	printf("%s\n",i->c_str());
	}
	return 0;
	}

	int main(int argc,char **argv)
	{
	int bflag, ch;
	int opt_recurse=0;

	#ifdef SIGINFO
	signal(SIGINFO,sig_info);
	#endif

	bflag = 0;
	while ((ch = getopt(argc, argv, "P:Vabcempqrsh?v")) != -1) {
	switch (ch) {
	case 'P': opt_page = atoi(optarg); break;
	case 'V': printf("%s version %s\n",progname,PACKAGE_VERSION); exit(0);
	case 'a': opt_all++; break;
	case 'b': opt_print_sectors=1; break;
	case 'c': opt_print_sector_contents=1; break;
	case 'e': opt_exist++; break;
	case 'm': opt_ignore_metadata++; break;
	case 'p': opt_preen++; break;
	case 'q': opt_quiet++; break;
	case 'r': opt_recurse++; break;
	case 's': opt_s3++;break;
	case 'v': opt_verbose++;break;
	case 'h':
	case '?':
	default:
	usage();
	}
	}
	argc -= optind;
	argv += optind;

	if(opt_recurse){
	if(argc!=2) usage();
	char dir1 = argv++;
	char dir2 = argv++;
	recurse(dir1,dir2);
	if(errors.size()>0){
	fprintf(stderr,"================================\n");
	fprintf(stderr,"%zd affcompare errors:\n",errors.size());
	for(vector<string>::const_iterator i=errors.begin();
	i!=errors.end();
	i++){
	fputs(i->c_str(),stderr);
	}
	exit(1);
	}
	exit(0);
	}

	if(argc>1){
	char *last = argv[argc-1];
	if(last[strlen(last)-1]=='/'){
	while(argc>1){
	char file1 = argv;
	char *name1 = file1;
	char *cc;

	cc = strrchr(file1,'/');
	if(cc) name1 = cc+1;

	char file2[MAXPATHLEN+1];
	strlcpy(file2,last,sizeof(file2));
	strlcat(file2,name1,sizeof(file2));
	int e_code = compare_aff_aff(file1,file2);
	if(e_code) exit(e_code);
	argv++;
	argc--;
	}
	}
	}

	if(argc!=2) usage(); // if just 2, compare them

	char file1 = argv++;
	char file2 = argv++;

	if(opt_verbose) printf("%s...\n",file1);
	int e_code = compare_aff_aff(file1,file2);
	exit(e_code);
	}

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