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101 lines
2.4 KiB
Objective-C
101 lines
2.4 KiB
Objective-C
/*
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* Checksums.m
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*
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* Copyright (c) 2017-present, MacPaw Inc. All rights reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301 USA
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*/
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#import "Checksums.h"
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@implementation CSHandle (Checksums)
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-(BOOL)hasChecksum { return NO; }
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-(BOOL)isChecksumCorrect { return YES; }
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@end
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@implementation CSSubHandle (Checksums)
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-(BOOL)hasChecksum
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{
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off_t length=[parent fileSize];
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if(length==CSHandleMaxLength) return NO;
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return end==length&&[parent hasChecksum];
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}
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-(BOOL)isChecksumCorrect { return [parent isChecksumCorrect]; }
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@end
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@implementation CSStreamHandle (Checksums)
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-(BOOL)hasChecksum
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{
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if(input) return [CSInputHandle(input) hasChecksum];
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else return NO;
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}
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-(BOOL)isChecksumCorrect
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{
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if(input) return [CSInputHandle(input) isChecksumCorrect];
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else return YES;
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}
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@end
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@implementation CSChecksumWrapperHandle
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-(id)initWithHandle:(CSHandle *)handle checksumHandle:(CSHandle *)checksumhandle
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{
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if((self=[super initWithParentHandle:handle]))
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{
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checksum=[checksumhandle 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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{
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[checksum release];
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[super dealloc];
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}
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-(off_t)fileSize { return [parent fileSize]; }
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-(off_t)offsetInFile { return [parent offsetInFile]; }
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-(BOOL)atEndOfFile { return [parent atEndOfFile]; }
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-(void)seekToFileOffset:(off_t)offs { [parent seekToFileOffset:offs]; }
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-(void)seekToEndOfFile { [parent seekToEndOfFile]; }
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-(void)pushBackByte:(int)byte { [parent pushBackByte:byte]; }
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-(int)readAtMost:(int)num toBuffer:(void *)buffer { return [parent readAtMost:num toBuffer:buffer]; }
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-(void)writeBytes:(int)num fromBuffer:(const void *)buffer { [parent writeBytes:num fromBuffer:buffer]; }
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-(BOOL)hasChecksum { return [checksum hasChecksum]; }
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-(BOOL)isChecksumCorrect { return [checksum isChecksumCorrect]; }
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@end
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