xbmc/filesystem/UDFBlockInput.cpp

   1 /*
   2  *  Copyright (C) 2005-2018 Team Kodi
   3  *  This file is part of Kodi - https://kodi.tv
   4  *
   5  *  SPDX-License-Identifier: GPL-2.0-or-later
   6  *  See LICENSES/README.md for more information.
   7  */
   8
   9 #include "UDFBlockInput.h"
  10
  11 #include "filesystem/File.h"
  12
  13 #include <mutex>
  14
  15 #include <udfread/udfread.h>
  16
  17 int CUDFBlockInput::Close(udfread_block_input* bi)
  18 {
  19   auto m_bi = reinterpret_cast<UDF_BI*>(bi);
  20
  21   m_bi->fp->Close();
  22
  23   return 0;
  24 }
  25
  26 uint32_t CUDFBlockInput::Size(udfread_block_input* bi)
  27 {
  28   auto m_bi = reinterpret_cast<UDF_BI*>(bi);
  29
  30   return static_cast<uint32_t>(m_bi->fp->GetLength() / UDF_BLOCK_SIZE);
  31 }
  32
  33 int CUDFBlockInput::Read(
  34     udfread_block_input* bi, uint32_t lba, void* buf, uint32_t blocks, int flags)
  35 {
  36   auto m_bi = reinterpret_cast<UDF_BI*>(bi);
  37   std::unique_lock<CCriticalSection> lock(m_bi->lock);
  38
  39   int64_t pos = static_cast<int64_t>(lba) * UDF_BLOCK_SIZE;
  40
  41   if (m_bi->fp->Seek(pos, SEEK_SET) != pos)
  42     return -1;
  43
  44   ssize_t size = blocks * UDF_BLOCK_SIZE;
  45   ssize_t read = m_bi->fp->Read(buf, size);
  46   if (read > 0)
  47     return static_cast<int>(read / UDF_BLOCK_SIZE);
  48
  49   return static_cast<int>(read);
  50 }
  51
  52 udfread_block_input* CUDFBlockInput::GetBlockInput(const std::string& file)
  53 {
  54   auto fp = std::make_shared<XFILE::CFile>();
  55
  56   if (fp->Open(file))
  57   {
  58     m_bi = std::make_unique<UDF_BI>();
  59     if (m_bi)
  60     {
  61       m_bi->fp = fp;
  62       m_bi->bi.close = CUDFBlockInput::Close;
  63       m_bi->bi.read = CUDFBlockInput::Read;
  64       m_bi->bi.size = CUDFBlockInput::Size;
  65
  66       return &m_bi->bi;
  67     }
  68
  69     fp->Close();
  70   }
  71
  72   return nullptr;
  73 }