mirror of
https://github.com/MacPaw/XADMaster.git
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111 lines
2.4 KiB
Objective-C
111 lines
2.4 KiB
Objective-C
/*
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* CSSubHandle.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 "CSSubHandle.h"
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@implementation CSSubHandle
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-(id)initWithHandle:(CSHandle *)handle from:(off_t)from length:(off_t)length
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{
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if((self=[super initWithParentHandle:handle]))
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{
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start=from;
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end=from+length;
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[parent seekToFileOffset:start];
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if(parent) return self;
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[self release];
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}
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return nil;
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}
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-(id)initAsCopyOf:(CSSubHandle *)other
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{
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if(self=[super initAsCopyOf:other])
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{
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start=other->start;
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end=other->end;
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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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[super dealloc];
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}
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-(off_t)startOffsetInParent { return start; }
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-(off_t)fileSize
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{
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return end-start;
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/* off_t parentsize=[parent fileSize];
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if(parentsize>end) return end-start;
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else if(parentsize<start) return 0;
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else return parentsize-start;*/
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}
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-(off_t)offsetInFile
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{
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return [parent offsetInFile]-start;
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}
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-(BOOL)atEndOfFile
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{
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return [parent offsetInFile]==end||[parent atEndOfFile];
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}
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-(void)seekToFileOffset:(off_t)offs
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{
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if(offs<0) [self _raiseNotSupported:_cmd];
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if(offs>end) [self _raiseEOF];
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[parent seekToFileOffset:offs+start];
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}
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-(void)seekToEndOfFile
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{
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// @try
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{
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[parent seekToFileOffset:end];
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}
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/* @catch(NSException *e)
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{
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if([[e name] isEqual:@"CSEndOfFileException"]) [parent seekToEndOfFile];
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else @throw;
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}*/
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}
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-(int)readAtMost:(int)num toBuffer:(void *)buffer
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{
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off_t curr=[parent offsetInFile];
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if(curr+num>end) num=(int)(end-curr);
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if(num<=0) return 0;
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else return [parent readAtMost:num toBuffer:buffer];
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}
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-(NSString *)description
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{
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return [NSString stringWithFormat:@"%@ @ %qu from %qu length %qu for %@",
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[self class],[self offsetInFile],start,end-start,[parent description]];
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}
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@end
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