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90 lines
2.8 KiB
Objective-C
90 lines
2.8 KiB
Objective-C
//
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// PackIndex.m
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// Arq
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//
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// Created by Stefan Reitshamer on 12/30/13.
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// Copyright (c) 2013 Stefan Reitshamer. All rights reserved.
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//
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#include <libkern/OSByteOrder.h>
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#import "PackIndex.h"
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#import "PackIndexEntry.h"
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#import "NSString_extra.h"
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#import "Fark.h"
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#import "StringIO.h"
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#import "IntegerIO.h"
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#import "DataInputStream.h"
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#import "BufferedInputStream.h"
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typedef struct index_object {
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uint64_t nbo_offset;
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uint64_t nbo_datalength;
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unsigned char sha1[20];
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unsigned char filler[4];
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} index_object;
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typedef struct pack_index {
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uint32_t magic_number;
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uint32_t nbo_version;
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uint32_t nbo_fanout[256];
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index_object first_index_object;
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} pack_index;
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@implementation PackIndex
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- (id)initWithPackId:(PackId *)thePackId indexData:(NSData *)theIndexData {
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if (self = [super init]) {
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packId = [thePackId retain];
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indexData = [theIndexData retain];
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}
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return self;
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}
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- (void)dealloc {
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[packId release];
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[indexData release];
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[super dealloc];
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}
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- (NSArray *)packIndexEntries:(NSError **)error {
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NSMutableArray *ret = [NSMutableArray array];
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if ([indexData length] < sizeof(pack_index)) {
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SETNSERROR([self errorDomain], -1, @"pack index data length %ld is smaller than size of pack_index", (unsigned long)[indexData length]);
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return nil;
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}
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pack_index *the_pack_index = (pack_index *)[indexData bytes];
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uint32_t count = OSSwapBigToHostInt32(the_pack_index->nbo_fanout[255]);
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// HSLogDebug(@"count=%d sizeof(pack_index)=%ld sizeof(index_object)=%ld data length=%ld", count, sizeof(pack_index), sizeof(index_object), [indexData length]);
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if ([indexData length] < sizeof(pack_index) + (count - 1) * sizeof(index_object)) {
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SETNSERROR([self errorDomain], -1, @"pack index data length %ld is smaller than size of pack_index + index_objects", (unsigned long)[indexData length]);
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return nil;
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}
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index_object *indexObjects = &(the_pack_index->first_index_object);
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NSAutoreleasePool *pool = nil;
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for (uint32_t i = 0; i < count; i++) {
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[pool drain];
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pool = [[NSAutoreleasePool alloc] init];
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uint64_t offset = OSSwapBigToHostInt64(indexObjects[i].nbo_offset);
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uint64_t dataLength = OSSwapBigToHostInt64(indexObjects[i].nbo_datalength);
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NSString *objectSHA1 = [NSString hexStringWithBytes:indexObjects[i].sha1 length:20];
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PackIndexEntry *pie = [[[PackIndexEntry alloc] initWithPackId:packId offset:offset dataLength:dataLength objectSHA1:objectSHA1] autorelease];
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[ret addObject:pie];
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}
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[pool drain];
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pool = nil;
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return ret;
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}
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#pragma mark NSObject
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- (NSString *)errorDomain {
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return @"PackIndexErrorDomain";
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}
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- (NSString *)description {
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return [NSString stringWithFormat:@"<PackIndex: %@>", [packId description]];
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}
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@end
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