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| author | Joe Ludwig <[email protected]> | 2013-06-26 15:22:04 -0700 |
|---|---|---|
| committer | Joe Ludwig <[email protected]> | 2013-06-26 15:22:04 -0700 |
| commit | 39ed87570bdb2f86969d4be821c94b722dc71179 (patch) | |
| tree | abc53757f75f40c80278e87650ea92808274aa59 /mp/src/tier1/undiff.cpp | |
| download | source-sdk-2013-39ed87570bdb2f86969d4be821c94b722dc71179.tar.xz source-sdk-2013-39ed87570bdb2f86969d4be821c94b722dc71179.zip | |
First version of the SOurce SDK 2013
Diffstat (limited to 'mp/src/tier1/undiff.cpp')
| -rw-r--r-- | mp/src/tier1/undiff.cpp | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/mp/src/tier1/undiff.cpp b/mp/src/tier1/undiff.cpp new file mode 100644 index 00000000..40a0773c --- /dev/null +++ b/mp/src/tier1/undiff.cpp @@ -0,0 +1,94 @@ +//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// UnDiff - Apply difference block
+//
+//=============================================================================//
+
+#include "tier0/platform.h"
+#include "tier0/dbg.h"
+#include "tier1/diff.h"
+#include "mathlib/mathlib.h"
+
+// memdbgon must be the last include file in a .cpp file!!!
+#include "tier0/memdbgon.h"
+
+void ApplyDiffs(uint8 const *OldBlock, uint8 const *DiffList,
+ int OldSize, int DiffListSize, int &ResultListSize,uint8 *Output,uint32 OutSize)
+{
+ uint8 const *copy_src=OldBlock;
+ uint8 const *end_of_diff_list=DiffList+DiffListSize;
+ uint8 const *obuf=Output;
+ while(DiffList<end_of_diff_list)
+ {
+ // printf("dptr=%x ",DiffList-d);
+ uint8 op=*(DiffList++);
+ if (op==0)
+ {
+ uint16 copy_sz=DiffList[0]+256*DiffList[1];
+ int copy_ofs=DiffList[2]+DiffList[3]*256;
+ if (copy_ofs>32767)
+ copy_ofs|=0xffff0000;
+ // printf("long cp from %x to %x len=%d\n", copy_src+copy_ofs-OldBlock,Output-obuf,copy_sz);
+
+ memcpy(Output,copy_src+copy_ofs,copy_sz);
+ Output+=copy_sz;
+ copy_src=copy_src+copy_ofs+copy_sz;
+ DiffList+=4;
+ }
+ else
+ {
+ if (op & 0x80)
+ {
+ int copy_sz=op & 0x7f;
+ int copy_ofs;
+ if (copy_sz==0)
+ {
+ copy_sz=DiffList[0];
+ if (copy_sz==0)
+ {
+ // big raw copy
+ copy_sz=DiffList[1]+256*DiffList[2]+65536*DiffList[3];
+ memcpy(Output,DiffList+4,copy_sz);
+ // printf("big rawcopy to %x len=%d\n", Output-obuf,copy_sz);
+
+ DiffList+=copy_sz+4;
+ Output+=copy_sz;
+ }
+ else
+ {
+ copy_ofs=DiffList[1]+(DiffList[2]*256);
+ if (copy_ofs>32767)
+ copy_ofs|=0xffff0000;
+ // printf("long ofs cp from %x to %x len=%d\n", copy_src+copy_ofs-OldBlock,Output-obuf,copy_sz);
+
+ memcpy(Output,copy_src+copy_ofs,copy_sz);
+ Output+=copy_sz;
+ copy_src=copy_src+copy_ofs+copy_sz;
+ DiffList+=3;
+ }
+ }
+ else
+ {
+ copy_ofs=DiffList[0];
+ if (copy_ofs>127)
+ copy_ofs|=0xffffff80;
+ // printf("cp from %x to %x len=%d\n", copy_src+copy_ofs-OldBlock,Output-obuf,copy_sz);
+
+ memcpy(Output,copy_src+copy_ofs,copy_sz);
+ Output+=copy_sz;
+ copy_src=copy_src+copy_ofs+copy_sz;
+ DiffList++;
+ }
+ }
+ else
+ {
+ // printf("raw copy %d to %x\n",op & 127,Output-obuf);
+ memcpy(Output,DiffList,op & 127);
+ Output+=op & 127;
+ DiffList+=(op & 127);
+ }
+ }
+ }
+ ResultListSize=Output-obuf;
+
+}
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