mirror of
https://github.com/MacPaw/XADMaster.git
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100 lines
2 KiB
Objective-C
100 lines
2 KiB
Objective-C
/*
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* StuffItXUtilities.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 "StuffItXUtilities.h"
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#import "XADException.h"
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uint64_t ReadSitxP2(CSHandle *fh)
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{
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int n=1;
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while([fh readBitsLE:1]==1 && n<64) n++;
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if(n>=64) [XADException raiseDecrunchException];
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uint64_t value=0;
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uint64_t bit=1;
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while(n)
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{
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if([fh readBitsLE:1]==1)
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{
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n--;
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value|=bit;
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}
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bit<<=1;
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}
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return value-1;
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}
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uint32_t ReadSitxUInt32(CSHandle *fh)
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{
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uint32_t val=0;
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for(int i=0;i<sizeof(val);i++) val=(val<<8)|[fh readBitsLE:8];
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return val;
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}
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uint64_t ReadSitxUInt64(CSHandle *fh)
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{
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uint64_t val=0;
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for(int i=0;i<sizeof(val);i++) val=(val<<8)|[fh readBitsLE:8];
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return val;
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}
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NSData *ReadSitxString(CSHandle *fh)
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{
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int len=(int)ReadSitxP2(fh);
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NSData *data=[fh readDataOfLength:len];
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[fh flushReadBits];
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return data;
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}
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NSData *ReadSitxData(CSHandle *fh,int n)
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{
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NSMutableData *data=[NSMutableData data];
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for(int i=0;i<n;i++)
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{
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uint8_t byte=[fh readBitsLE:8];
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[data appendBytes:&byte length:1];
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}
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return data;
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}
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uint64_t CSInputNextSitxP2(CSInputBuffer *input)
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{
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int n=1;
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while(CSInputNextBitLE(input)==1) n++;
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uint64_t value=0;
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uint64_t bit=1;
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while(n)
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{
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if(CSInputNextBitLE(input)==1)
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{
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n--;
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value|=bit;
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}
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bit<<=1;
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}
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return value-1;
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}
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