1 files changed, 48 insertions, 51 deletions

diff --git a/src/libs/7zip/win/C/Bra86.c b/src/libs/7zip/win/C/Bra86.c
index 1ee0e709b..6db15e7ec 100644
--- a/src/libs/7zip/win/C/Bra86.c
+++ b/src/libs/7zip/win/C/Bra86.c
@@ -1,85 +1,82 @@
 /* Bra86.c -- Converter for x86 code (BCJ)
-2008-10-04 : Igor Pavlov : Public domain */
+2013-11-12 : Igor Pavlov : Public domain */
 
-#include "Bra.h"
+#include "Precomp.h"
 
-#define Test86MSByte(b) ((b) == 0 || (b) == 0xFF)
+#include "Bra.h"
 
-const Byte kMaskToAllowedStatus[8] = {1, 1, 1, 0, 1, 0, 0, 0};
-const Byte kMaskToBitNumber[8] = {0, 1, 2, 2, 3, 3, 3, 3};
+#define Test86MSByte(b) ((((b) + 1) & 0xFE) == 0)
 
 SizeT x86_Convert(Byte *data, SizeT size, UInt32 ip, UInt32 *state, int encoding)
 {
-  SizeT bufferPos = 0, prevPosT;
-  UInt32 prevMask = *state & 0x7;
+  SizeT pos = 0;
+  UInt32 mask = *state & 7;
   if (size < 5)
     return 0;
+  size -= 4;
   ip += 5;
-  prevPosT = (SizeT)0 - 1;
 
   for (;;)
   {
-    Byte *p = data + bufferPos;
-    Byte *limit = data + size - 4;
+    Byte *p = data + pos;
+    const Byte *limit = data + size;
     for (; p < limit; p++)
       if ((*p & 0xFE) == 0xE8)
         break;
-    bufferPos = (SizeT)(p - data);
-    if (p >= limit)
-      break;
-    prevPosT = bufferPos - prevPosT;
-    if (prevPosT > 3)
-      prevMask = 0;
-    else
+
     {
-      prevMask = (prevMask << ((int)prevPosT - 1)) & 0x7;
-      if (prevMask != 0)
+      SizeT d = (SizeT)(p - data - pos);
+      pos = (SizeT)(p - data);
+      if (p >= limit)
       {
-        Byte b = p[4 - kMaskToBitNumber[prevMask]];
-        if (!kMaskToAllowedStatus[prevMask] || Test86MSByte(b))
+        *state = (d > 2 ? 0 : mask >> (unsigned)d);
+        return pos;
+      }
+      if (d > 2)
+        mask = 0;
+      else
+      {
+        mask >>= (unsigned)d;
+        if (mask != 0 && (mask > 4 || mask == 3 || Test86MSByte(p[(mask >> 1) + 1])))
         {
-          prevPosT = bufferPos;
-          prevMask = ((prevMask << 1) & 0x7) | 1;
-          bufferPos++;
+          mask = (mask >> 1) | 4;
+          pos++;
           continue;
         }
       }
     }
-    prevPosT = bufferPos;
 
     if (Test86MSByte(p[4]))
     {
-      UInt32 src = ((UInt32)p[4] << 24) | ((UInt32)p[3] << 16) | ((UInt32)p[2] << 8) | ((UInt32)p[1]);
-      UInt32 dest;
-      for (;;)
+      UInt32 v = ((UInt32)p[4] << 24) | ((UInt32)p[3] << 16) | ((UInt32)p[2] << 8) | ((UInt32)p[1]);
+      UInt32 cur = ip + (UInt32)pos;
+      pos += 5;
+      if (encoding)
+        v += cur;
+      else
+        v -= cur;
+      if (mask != 0)
       {
-        Byte b;
-        int index;
-        if (encoding)
-          dest = (ip + (UInt32)bufferPos) + src;
-        else
-          dest = src - (ip + (UInt32)bufferPos);
-        if (prevMask == 0)
-          break;
-        index = kMaskToBitNumber[prevMask] * 8;
-        b = (Byte)(dest >> (24 - index));
-        if (!Test86MSByte(b))
-          break;
-        src = dest ^ ((1 << (32 - index)) - 1);
+        unsigned sh = (mask & 6) << 2;
+        if (Test86MSByte((Byte)(v >> sh)))
+        {
+          v ^= (((UInt32)0x100 << sh) - 1);
+          if (encoding)
+            v += cur;
+          else
+            v -= cur;
+        }
+        mask = 0;
       }
-      p[4] = (Byte)(~(((dest >> 24) & 1) - 1));
-      p[3] = (Byte)(dest >> 16);
-      p[2] = (Byte)(dest >> 8);
-      p[1] = (Byte)dest;
-      bufferPos += 5;
+      p[1] = (Byte)v;
+      p[2] = (Byte)(v >> 8);
+      p[3] = (Byte)(v >> 16);
+      p[4] = (Byte)(0 - ((v >> 24) & 1));
     }
     else
     {
-      prevMask = ((prevMask << 1) & 0x7) | 1;
-      bufferPos++;
+      mask = (mask >> 1) | 4;
+      pos++;
     }
   }
-  prevPosT = bufferPos - prevPosT;
-  *state = ((prevPosT > 3) ? 0 : ((prevMask << ((int)prevPosT - 1)) & 0x7));
-  return bufferPos;
 }