4.20

7zip/Compress/Branch/BranchARMThumb.c

@@ -0,0 +1,35 @@
+// BranchARMThumb.c
+
+#include "BranchARMThumb.h"
+
+UInt32 ARMThumb_Convert(Byte *data, UInt32 size, UInt32 nowPos, int encoding)
+{
+  UInt32 i;
+  for (i = 0; i + 4 <= size; i += 2)
+  {
+    if ((data[i + 1] & 0xF8) == 0xF0 && 
+        (data[i + 3] & 0xF8) == 0xF8)
+    {
+      UInt32 src = 
+        ((data[i + 1] & 0x7) << 19) |
+        (data[i + 0] << 11) |
+        ((data[i + 3] & 0x7) << 8) |
+        (data[i + 2]);
+      
+      src <<= 1;
+      UInt32 dest;
+      if (encoding)
+        dest = nowPos + i + 4 + src;
+      else
+        dest = src - (nowPos + i + 4);
+      dest >>= 1;
+      
+      data[i + 1] = 0xF0 | ((dest >> 19) & 0x7);
+      data[i + 0] = (dest >> 11);
+      data[i + 3] = 0xF8 | ((dest >> 8) & 0x7);
+      data[i + 2] = (dest);
+      i += 2;
+    }
+  }
+  return i;
+}