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// SUBinaryDeltaApply.m
// Sparkle
// Created by Mark Rowe on 2009-06-01.
// Copyright 2009 Mark Rowe. All rights reserved.
#import "SUBinaryDeltaApply.h"
#import "SUBinaryDeltaCommon.h"
#import <CommonCrypto/CommonDigest.h>
#import <Foundation/Foundation.h>
#import <bspatch.h>
#import <stdio.h>
#import <stdlib.h>
#import <xar/xar.h>
static void applyBinaryDeltaToFile(xar_t x, xar_file_t file, NSString *sourceFilePath, NSString *destinationFilePath)
NSString *patchFile = temporaryFilename(@"apply-binary-delta");
xar_extract_tofile(x, file, [patchFile fileSystemRepresentation]);
const char *argv[] = {"/usr/bin/bspatch", [sourceFilePath fileSystemRepresentation], [destinationFilePath fileSystemRepresentation], [patchFile fileSystemRepresentation]};
bspatch(4, (char **)argv);
unlink([patchFile fileSystemRepresentation]);
int applyBinaryDelta(NSString *source, NSString *destination, NSString *patchFile)
xar_t x = xar_open([patchFile UTF8String], READ);
if (!x) {
fprintf(stderr, "Unable to open %s. Giving up.\n", [patchFile UTF8String]);
return 1;
NSString *expectedBeforeHash = nil;
NSString *expectedAfterHash = nil;
xar_subdoc_t subdoc;
for (subdoc = xar_subdoc_first(x); subdoc; subdoc = xar_subdoc_next(subdoc)) {
if (!strcmp(xar_subdoc_name(subdoc), "binary-delta-attributes")) {
const char *value = 0;
xar_subdoc_prop_get(subdoc, "before-sha1", &value);
if (value)
expectedBeforeHash = [NSString stringWithUTF8String:value];
xar_subdoc_prop_get(subdoc, "after-sha1", &value);
if (value)
expectedAfterHash = [NSString stringWithUTF8String:value];
if (!expectedBeforeHash || !expectedAfterHash) {
fprintf(stderr, "Unable to find before-sha1 or after-sha1 metadata in delta. Giving up.\n");
return 1;
fprintf(stderr, "Verifying source... ");
NSString *beforeHash = hashOfTree(source);
if (![beforeHash isEqualToString:expectedBeforeHash]) {
fprintf(stderr, "Source doesn't have expected hash (%s != %s). Giving up.\n", [expectedBeforeHash UTF8String], [beforeHash UTF8String]);
return 1;
fprintf(stderr, "\nCopying files... ");
copyTree(source, destination);
fprintf(stderr, "\nPatching... ");
xar_file_t file;
xar_iter_t iter = xar_iter_new();
for (file = xar_file_first(x, iter); file; file = xar_file_next(iter)) {
NSString *path = [NSString stringWithUTF8String:xar_get_path(file)];
NSString *sourceFilePath = [source stringByAppendingPathComponent:path];
NSString *destinationFilePath = [destination stringByAppendingPathComponent:path];
const char *value;
if (!xar_prop_get(file, "delete", &value) || !xar_prop_get(file, "delete-then-extract", &value)) {
if (!xar_prop_get(file, "delete", &value))
if (!xar_prop_get(file, "binary-delta", &value))
applyBinaryDeltaToFile(x, file, sourceFilePath, destinationFilePath);
xar_extract_tofile(x, file, [destinationFilePath fileSystemRepresentation]);
fprintf(stderr, "\nVerifying destination... ");
NSString *afterHash = hashOfTree(destination);
if (![afterHash isEqualToString:expectedAfterHash]) {
fprintf(stderr, "Destination doesn't have expected hash (%s != %s). Giving up.\n", [expectedAfterHash UTF8String], [afterHash UTF8String]);
return 1;
fprintf(stderr, "\nDone!\n");
return 0;
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