release/src-rt-6.x.4708/tools/misc/xz/src/liblzma/common/vli_size.c

   1 ///////////////////////////////////////////////////////////////////////////////
   2 //
   3 /// \file       vli_size.c
   4 /// \brief      Calculates the encoded size of a variable-length integer
   5 //
   6 //  Author:     Lasse Collin
   7 //
   8 //  This file has been put into the public domain.
   9 //  You can do whatever you want with this file.
  10 //
  11 ///////////////////////////////////////////////////////////////////////////////
  12
  13 #include "common.h"
  14
  15
  16 extern LZMA_API(uint32_t)
  17 lzma_vli_size(lzma_vli vli)
  18 {
  19         if (vli > LZMA_VLI_MAX)
  20                 return 0;
  21
  22         uint32_t i = 0;
  23         do {
  24                 vli >>= 7;
  25                 ++i;
  26         } while (vli != 0);
  27
  28         assert(i <= LZMA_VLI_BYTES_MAX);
  29         return i;
  30 }