nel/3rdparty/seven_zip/BraIA64.c

   1 /* BraIA64.c -- Converter for IA-64 code
   2 2017-01-26 : Igor Pavlov : Public domain */
   3
   4 #include "Precomp.h"
   5
   6 #include "CpuArch.h"
   7 #include "Bra.h"
   8
   9 SizeT IA64_Convert(Byte *data, SizeT size, UInt32 ip, int encoding)
  10 {
  11   SizeT i;
  12   if (size < 16)
  13     return 0;
  14   size -= 16;
  15   i = 0;
  16   do
  17   {
  18     unsigned m = ((UInt32)0x334B0000 >> (data[i] & 0x1E)) & 3;
  19     if (m)
  20     {
  21       m++;
  22       do
  23       {
  24         Byte *p = data + (i + (size_t)m * 5 - 8);
  25         if (((p[3] >> m) & 15) == 5
  26             && (((p[-1] | ((UInt32)p[0] << 8)) >> m) & 0x70) == 0)
  27         {
  28           unsigned raw = GetUi32(p);
  29           unsigned v = raw >> m;
  30           v = (v & 0xFFFFF) | ((v & (1 << 23)) >> 3);
  31
  32           v <<= 4;
  33           if (encoding)
  34             v += ip + (UInt32)i;
  35           else
  36             v -= ip + (UInt32)i;
  37           v >>= 4;
  38
  39           v &= 0x1FFFFF;
  40           v += 0x700000;
  41           v &= 0x8FFFFF;
  42           raw &= ~((UInt32)0x8FFFFF << m);
  43           raw |= (v << m);
  44           SetUi32(p, raw);
  45         }
  46       }
  47       while (++m <= 4);
  48     }
  49     i += 16;
  50   }
  51   while (i <= size);
  52   return i;
  53 }