4.20

7zip/Compress/Branch/BranchPPC.c

@@ -0,0 +1,36 @@
+// BranchPPC.c
+
+#include "BranchPPC.h"
+
+UInt32 PPC_B_Convert(Byte *data, UInt32 size, UInt32 nowPos, int encoding)
+{
+  UInt32 i;
+  for (i = 0; i + 4 <= size; i += 4)
+  {
+    // PowerPC branch 6(48) 24(Offset) 1(Abs) 1(Link)
+    if ((data[i] >> 2) == 0x12 && 
+    (
+      (data[i + 3] & 3) == 1 
+      // || (data[i+3] & 3) == 3
+      )
+    )
+    {
+      UInt32 src = ((data[i + 0] & 3) << 24) |
+        (data[i + 1] << 16) |
+        (data[i + 2] << 8) |
+        (data[i + 3] & (~3));
+      
+      UInt32 dest;
+      if (encoding)
+        dest = nowPos + i + src;
+      else
+        dest = src - (nowPos + i);
+      data[i + 0] = 0x48 | ((dest >> 24) &  0x3);
+      data[i + 1] = (dest >> 16);
+      data[i + 2] = (dest >> 8);
+      data[i + 3] &= 0x3;
+      data[i + 3] |= dest;
+    }
+  }
+  return i;
+}