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

   1 ///////////////////////////////////////////////////////////////////////////////
   2 //
   3 /// \file       filter_buffer_encoder.c
   4 /// \brief      Single-call raw encoding
   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_raw_buffer_encode(const lzma_filter *filters, lzma_allocator *allocator,
  18                 const uint8_t *in, size_t in_size, uint8_t *out,
  19                 size_t *out_pos, size_t out_size)
  20 {
  21         // Validate what isn't validated later in filter_common.c.
  22         if ((in == NULL && in_size != 0) || out == NULL
  23                         || out_pos == NULL || *out_pos > out_size)
  24                 return LZMA_PROG_ERROR;
  25
  26         // Initialize the encoder
  27         lzma_next_coder next = LZMA_NEXT_CODER_INIT;
  28         return_if_error(lzma_raw_encoder_init(&next, allocator, filters));
  29
  30         // Store the output position so that we can restore it if
  31         // something goes wrong.
  32         const size_t out_start = *out_pos;
  33
  34         // Do the actual encoding and free coder's memory.
  35         size_t in_pos = 0;
  36         lzma_ret ret = next.code(next.coder, allocator, in, &in_pos, in_size,
  37                         out, out_pos, out_size, LZMA_FINISH);
  38         lzma_next_end(&next, allocator);
  39
  40         if (ret == LZMA_STREAM_END) {
  41                 ret = LZMA_OK;
  42         } else {
  43                 if (ret == LZMA_OK) {
  44                         // Output buffer was too small.
  45                         assert(*out_pos == out_size);
  46                         ret = LZMA_BUF_ERROR;
  47                 }
  48
  49                 // Restore the output position.
  50                 *out_pos = out_start;
  51         }
  52
  53         return ret;
  54 }