src/liblzma/simple/simple_encoder.c

   1 ///////////////////////////////////////////////////////////////////////////////
   2 //
   3 /// \file       simple_encoder.c
   4 /// \brief      Properties encoder for simple filters
   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 "simple_encoder.h"
  14
  15
  16 extern lzma_ret
  17 lzma_simple_props_size(uint32_t *size, const void *options)
  18 {
  19         const lzma_options_bcj *const opt = options;
  20         *size = (opt == NULL || opt->start_offset == 0) ? 0 : 4;
  21         return LZMA_OK;
  22 }
  23
  24
  25 extern lzma_ret
  26 lzma_simple_props_encode(const void *options, uint8_t *out)
  27 {
  28         const lzma_options_bcj *const opt = options;
  29
  30         // The default start offset is zero, so we don't need to store any
  31         // options unless the start offset is non-zero.
  32         if (opt == NULL || opt->start_offset == 0)
  33                 return LZMA_OK;
  34
  35         unaligned_write32le(out, opt->start_offset);
  36
  37         return LZMA_OK;
  38 }