mirror of
https://github.com/MacPaw/XADMaster.git
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61 lines
1.6 KiB
Objective-C
61 lines
1.6 KiB
Objective-C
/*
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* XADChecksumHandle.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 "XADChecksumHandle.h"
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@implementation XADChecksumHandle
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-(id)initWithHandle:(CSHandle *)handle length:(off_t)length correctChecksum:(int)correct mask:(int)mask
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{
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if((self=[super initWithParentHandle:handle length:length]))
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{
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correctchecksum=correct;
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summask=mask;
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}
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return self;
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}
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-(void)resetStream
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{
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[parent seekToFileOffset:0];
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checksum=0;
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}
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-(int)streamAtMost:(int)num toBuffer:(void *)buffer
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{
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int actual=[parent readAtMost:num toBuffer:buffer];
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uint8_t *bytes=buffer;
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for(int i=0;i<actual;i++) checksum+=bytes[i];
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return actual;
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}
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-(BOOL)hasChecksum { return YES; }
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-(BOOL)isChecksumCorrect
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{
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return (checksum&summask)==(correctchecksum&summask);
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}
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-(double)estimatedProgress { return [parent estimatedProgress]; }
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@end
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