mirror of
https://github.com/MacPaw/XADMaster.git
synced 2025-08-28 19:13:49 +02:00
141 lines
3.2 KiB
Objective-C
141 lines
3.2 KiB
Objective-C
/*
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* XADStuffItXBlendHandle.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 "XADStuffItXBlendHandle.h"
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#import "XADStuffItXDarkhorseHandle.h"
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#import "XADStuffItXCyanideHandle.h"
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#import "XADPPMdHandles.h"
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@implementation XADStuffItXBlendHandle
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-(id)initWithHandle:(CSHandle *)handle length:(off_t)length
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{
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if((self=[super initWithParentHandle:handle length:length]))
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{
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currhandle=nil;
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currinput=NULL;
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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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[currhandle release];
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[super dealloc];
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}
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-(void)resetStream
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{
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[currhandle release];
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currhandle=nil;
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}
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-(int)streamAtMost:(int)num toBuffer:(void *)buffer
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{
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int bytes=0;
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uint8_t *bytebuffer=buffer;
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while(bytes<num)
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{
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if(!currhandle)
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{
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uint8_t buf[6];
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int actual=[parent readAtMost:6 toBuffer:buf];
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if(actual<6)
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{
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[self endStream];
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return bytes;
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}
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for(;;)
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{
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if(buf[0]==0x77&&buf[1]<=3) // possible match
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{
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// Check for a possible later match
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if((buf[2]==0x77&&buf[3]<=3)||(buf[3]==0x77&&buf[4]<=3)||(buf[4]==0x77&&buf[5]<=3))
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{
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// Only break if our size looks legit if there is a possible later match.
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if((CSUInt32BE(&buf[2])&0x1fff)==0) break;
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}
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else break;
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}
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memmove(buf,buf+1,5);
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buf[5]=[parent readUInt8];
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}
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uint32_t size=CSUInt32BE(&buf[2]);
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//NSLog(@"%d %x",buf[1],size);
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switch(buf[1])
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{
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case 0:
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currhandle=[[parent subHandleOfLength:size] retain];
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currinput=NULL;
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break;
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case 1:
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{
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int windowsize=1<<[parent readUInt8];
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if(windowsize<0x100000) windowsize=0x100000;
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XADStuffItXDarkhorseHandle *dh=[[XADStuffItXDarkhorseHandle alloc]
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initWithHandle:parent length:size windowSize:windowsize];
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currinput=dh->input;
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currhandle=dh;
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}
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break;
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case 2:
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{
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XADStuffItXCyanideHandle *ch=[[XADStuffItXCyanideHandle alloc]
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initWithHandle:parent length:size];
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currinput=ch->input;
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currhandle=ch;
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}
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break;
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case 3:
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{
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int allocsize=1<<[parent readUInt8];
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int order=[parent readUInt8];
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XADStuffItXBrimstoneHandle *bh=[[XADStuffItXBrimstoneHandle alloc]
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initWithHandle:parent length:size maxOrder:order subAllocSize:allocsize];
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currinput=bh->input;
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currhandle=bh;
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}
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break;
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}
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}
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int actual=[currhandle readAtMost:num-bytes toBuffer:bytebuffer+bytes];
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if(actual==0)
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{
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if(currinput) CSInputSynchronizeFileOffset(currinput);
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[currhandle release];
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currhandle=nil;
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}
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bytes+=actual;
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}
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return bytes;
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}
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@end
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