95 lines
2.7 KiB
C++
95 lines
2.7 KiB
C++
//========= Copyright Valve Corporation, All rights reserved. ============//
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//
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// UnDiff - Apply difference block
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//
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//=============================================================================//
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#include "tier0/platform.h"
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#include "tier0/dbg.h"
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#include "tier1/diff.h"
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#include "mathlib/mathlib.h"
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// memdbgon must be the last include file in a .cpp file!!!
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#include "tier0/memdbgon.h"
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void ApplyDiffs(uint8 const *OldBlock, uint8 const *DiffList,
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int OldSize, int DiffListSize, int &ResultListSize,uint8 *Output,uint32 OutSize)
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{
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uint8 const *copy_src=OldBlock;
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uint8 const *end_of_diff_list=DiffList+DiffListSize;
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uint8 const *obuf=Output;
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while(DiffList<end_of_diff_list)
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{
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// printf("dptr=%x ",DiffList-d);
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uint8 op=*(DiffList++);
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if (op==0)
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{
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uint16 copy_sz=DiffList[0]+256*DiffList[1];
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int copy_ofs=DiffList[2]+DiffList[3]*256;
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if (copy_ofs>32767)
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copy_ofs|=0xffff0000;
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// printf("long cp from %x to %x len=%d\n", copy_src+copy_ofs-OldBlock,Output-obuf,copy_sz);
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memcpy(Output,copy_src+copy_ofs,copy_sz);
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Output+=copy_sz;
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copy_src=copy_src+copy_ofs+copy_sz;
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DiffList+=4;
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}
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else
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{
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if (op & 0x80)
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{
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int copy_sz=op & 0x7f;
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int copy_ofs;
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if (copy_sz==0)
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{
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copy_sz=DiffList[0];
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if (copy_sz==0)
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{
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// big raw copy
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copy_sz=DiffList[1]+256*DiffList[2]+65536*DiffList[3];
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memcpy(Output,DiffList+4,copy_sz);
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// printf("big rawcopy to %x len=%d\n", Output-obuf,copy_sz);
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DiffList+=copy_sz+4;
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Output+=copy_sz;
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}
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else
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{
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copy_ofs=DiffList[1]+(DiffList[2]*256);
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if (copy_ofs>32767)
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copy_ofs|=0xffff0000;
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// printf("long ofs cp from %x to %x len=%d\n", copy_src+copy_ofs-OldBlock,Output-obuf,copy_sz);
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memcpy(Output,copy_src+copy_ofs,copy_sz);
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Output+=copy_sz;
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copy_src=copy_src+copy_ofs+copy_sz;
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DiffList+=3;
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}
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}
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else
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{
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copy_ofs=DiffList[0];
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if (copy_ofs>127)
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copy_ofs|=0xffffff80;
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// printf("cp from %x to %x len=%d\n", copy_src+copy_ofs-OldBlock,Output-obuf,copy_sz);
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memcpy(Output,copy_src+copy_ofs,copy_sz);
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Output+=copy_sz;
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copy_src=copy_src+copy_ofs+copy_sz;
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DiffList++;
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}
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}
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else
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{
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// printf("raw copy %d to %x\n",op & 127,Output-obuf);
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memcpy(Output,DiffList,op & 127);
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Output+=op & 127;
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DiffList+=(op & 127);
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}
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}
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}
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ResultListSize=Output-obuf;
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}
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