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

   1 ///////////////////////////////////////////////////////////////////////////////
   2 //
   3 /// \file       filter_flags_encoder.c
   4 /// \brief      Decodes a Filter Flags field
   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 "filter_encoder.h"
  14
  15
  16 extern LZMA_API(lzma_ret)
  17 lzma_filter_flags_size(uint32_t *size, const lzma_filter *filter)
  18 {
  19         if (filter->id >= LZMA_FILTER_RESERVED_START)
  20                 return LZMA_PROG_ERROR;
  21
  22         return_if_error(lzma_properties_size(size, filter));
  23
  24         *size += lzma_vli_size(filter->id) + lzma_vli_size(*size);
  25
  26         return LZMA_OK;
  27 }
  28
  29
  30 extern LZMA_API(lzma_ret)
  31 lzma_filter_flags_encode(const lzma_filter *filter,
  32                 uint8_t *out, size_t *out_pos, size_t out_size)
  33 {
  34         // Filter ID
  35         if (filter->id >= LZMA_FILTER_RESERVED_START)
  36                 return LZMA_PROG_ERROR;
  37
  38         return_if_error(lzma_vli_encode(filter->id, NULL,
  39                         out, out_pos, out_size));
  40
  41         // Size of Properties
  42         uint32_t props_size;
  43         return_if_error(lzma_properties_size(&props_size, filter));
  44         return_if_error(lzma_vli_encode(props_size, NULL,
  45                         out, out_pos, out_size));
  46
  47         // Filter Properties
  48         if (out_size - *out_pos < props_size)
  49                 return LZMA_PROG_ERROR;
  50
  51         return_if_error(lzma_properties_encode(filter, out + *out_pos));
  52
  53         *out_pos += props_size;
  54
  55         return LZMA_OK;
  56 }