mirror of
https://github.com/MacPaw/XADMaster.git
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91 lines
1.8 KiB
Objective-C
91 lines
1.8 KiB
Objective-C
/*
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* XADCompactProRLEHandle.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 "XADCompactProRLEHandle.h"
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@implementation XADCompactProRLEHandle:CSByteStreamHandle
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-(id)initWithHandle:(CSHandle *)handle length:(off_t)length
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{
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return [super initWithInputBufferForHandle:handle length:length];
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}
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-(void)resetByteStream
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{
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saved=0;
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repeat=0;
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halfescaped=NO;
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}
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-(uint8_t)produceByteAtOffset:(off_t)pos
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{
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//NSLog(@"rle %d %d",(int)pos,(int)CSInputBufferOffset(input));
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if(repeat)
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{
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repeat--;
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return saved;
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}
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int byte;
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if(halfescaped)
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{
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byte=0x81;
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halfescaped=NO;
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}
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else byte=CSInputNextByte(input);
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if(byte==0x81)
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{
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byte=CSInputNextByte(input);
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if(byte==0x82)
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{
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byte=CSInputNextByte(input);
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if(byte!=0)
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{
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repeat=byte-2; // ?
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return saved;
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}
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else
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{
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repeat=1;
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saved=0x82;
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return 0x81;
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}
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}
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else
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{
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if(byte==0x81)
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{
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halfescaped=YES;
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return saved=0x81;
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}
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else
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{
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repeat=1;
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saved=byte;
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return 0x81;
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}
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}
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}
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else return saved=byte;
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}
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@end
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