fileio.hxx

// dawn/include/dawn/io/fileio.hxx
//
// SPDX-License-Identifier: Apache-2.0
//
 
#pragma once
 
#include <limits.h>
 
#include "dawn/io/common.hxx"
#include "dawn/porting/config.hxx"
 
namespace dawn
{
class CIOFile : public CIOCommon
{
public:
  enum
  {
    IO_FILE_PERM_READ = 0,       
    IO_FILE_PERM_WRITE = 1,      
    IO_FILE_PERM_RW = 2,         
    IO_FILE_PERM_WRITE_ONCE = 3, 
  };
 
  enum
  {
    IO_FILE_CFG_FIRST = 0,
    IO_FILE_CFG_PATH = 1, 
    IO_FILE_CFG_PERM = 2, 
    IO_FILE_CFG_LAST = 31
  };
 
  explicit CIOFile(CDescObject &desc)
    : CIOCommon(desc)
    , fd(-1)
    , fsize(0)
    , perm(IO_FILE_PERM_READ)
    , writeOnceLocked(false)
    , devNode(false)
  {
  }
 
  ~CIOFile() override;
 
#ifdef CONFIG_DAWN_OBJECT_HAS_NAME
  const char *getClassNameStr() const override
  {
    return "file";
  }
#endif
 
  int configure() override;
  int deinit() override;
  int getDataImpl(IODataCmn &data, size_t len) override;
  int setDataImpl(IODataCmn &data) override;
  int getDataAtImpl(IODataCmn &data, size_t len, size_t offset) override;
  int setDataAtImpl(IODataCmn &data, size_t offset) override;
 
#ifdef CONFIG_DAWN_IO_NOTIFY
  int getFd() const override;
#endif
 
  size_t getDataSize() const override;
  size_t getDataDim() const override;
  bool isRead() const override;
  bool isWrite() const override;
 
  bool isNotify() const override
  {
    return false;
  }
 
  bool isBatch() const override
  {
    return false;
  }
 
  bool isSeekable() const override
  {
    return true;
  }
 
  using ObjectIdHelper = CIOCommon::IOObjectIdHelperNoTS<IO_CLASS_FILE, SObjectId::DTYPE_BLOCK>;
 
  constexpr static SObjectId::ObjectId objectId(uint16_t inst)
  {
    return ObjectIdHelper::create(inst);
  }
 
  constexpr static SObjectCfg::ObjectCfgId cfgIdPath(uint16_t size)
  {
    return SObjectCfg::objectCfg(SObjectId::OBJTYPE_IO,
                                 CIOCommon::IO_CLASS_FILE,
                                 SObjectId::DTYPE_CHAR,
                                 false,
                                 size,
                                 IO_FILE_CFG_PATH);
  }
 
  constexpr static SObjectCfg::ObjectCfgId cfgIdPerm()
  {
    return SObjectCfg::objectCfg(SObjectId::OBJTYPE_IO,
                                 CIOCommon::IO_CLASS_FILE,
                                 SObjectId::DTYPE_UINT8,
                                 false,
                                 1,
                                 IO_FILE_CFG_PERM);
  }
 
private:
  char path[PATH_MAX] = {}; 
  int fd;                   
  size_t fsize;             
  uint8_t perm;             
  bool writeOnceLocked;     
  bool devNode;             
 
  int configureDesc(const CDescObject &desc);
  int truncateFile();
};
} // Namespace dawn