misc/libphysfs/lzma/C/Compress/Branch/BranchPPC.c
author sheepluva
Wed, 16 May 2018 18:22:28 +0200
branchui-scaling
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parent 12213 bb5522e88ab2
permissions -rw-r--r--
adjust label, update ChangeLog
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/* BranchPPC.c */
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#include "BranchPPC.h"
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UInt32 PPC_B_Convert(Byte *data, UInt32 size, UInt32 nowPos, int encoding)
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{
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  UInt32 i;
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  for (i = 0; i + 4 <= size; i += 4)
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  {
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    /* PowerPC branch 6(48) 24(Offset) 1(Abs) 1(Link) */
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    if ((data[i] >> 2) == 0x12 && 
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    (
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      (data[i + 3] & 3) == 1 
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      /* || (data[i+3] & 3) == 3 */
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      )
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    )
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    {
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      UInt32 src = ((data[i + 0] & 3) << 24) |
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        (data[i + 1] << 16) |
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        (data[i + 2] << 8) |
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        (data[i + 3] & (~3));
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      UInt32 dest;
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      if (encoding)
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        dest = nowPos + i + src;
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      else
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        dest = src - (nowPos + i);
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      data[i + 0] = (Byte)(0x48 | ((dest >> 24) &  0x3));
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      data[i + 1] = (Byte)(dest >> 16);
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      data[i + 2] = (Byte)(dest >> 8);
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      data[i + 3] &= 0x3;
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      data[i + 3] |= dest;
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    }
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  }
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  return i;
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}