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Exiv2::XPathIo Class Reference

Provides binary IO for the data from stdin and data uri path. More...

`#include <basicio.hpp>`

Inheritance diagram for Exiv2::XPathIo:
[legend]

## Public Member Functions

Creators
| XPathIo (const std::string &orgPath)
| Default constructor that reads data from stdin/data uri path and writes them to the temp file.
| ~XPathIo () override
| Destructor. Releases all managed memory and removes the temp file.
| XPathIo (const XPathIo &)=delete
XPathIo & | operator= (const XPathIo &)=delete
Manipulators
void | transfer (BasicIo &src) override
| Change the name of the temp file and make it untemporary before calling the method of superclass FileIo::transfer.
Public Member Functions inherited from Exiv2::FileIo
| FileIo (const std::string &path)
| Constructor that accepts the file path on which IO will be performed. The constructor does not open the file, and therefore never fails.
| ~FileIo () override
| Destructor. Flushes and closes an open file.
int | open (const std::string &mode)
| Open the file using the specified mode.
int | open () override
| Open the file using the default access mode of "rb". This method can also be used to "reopen" a file which will flush any unwritten data and reset the IO position to the start.
int | close () override
| Flush and unwritten data and close the file . It is safe to call close on an already closed instance.
size_t | write (const byte *data, size_t wcount) override
| Write data to the file. The file position is advanced by the number of bytes written.
size_t | write (BasicIo &src) override
| Write data that is read from another BasicIo instance to the file. The file position is advanced by the number of bytes written.
int | putb (byte data) override
| Write one byte to the file. The file position is advanced by one byte.
DataBuf | read (size_t rcount) override
| Read data from the file. Reading starts at the current file position and the position is advanced by the number of bytes read.
size_t | read (byte *buf, size_t rcount) override
| Read data from the file. Reading starts at the current file position and the position is advanced by the number of bytes read.
int | getb () override
| Read one byte from the file. The file position is advanced by one byte.
int | seek (int64_t offset, Position pos) override
| Move the current IO position.
byte * | mmap (bool isWriteable=false) override
| Map the file into the process's address space. The file must be open before mmap() is called. If the mapped area is writeable, changes may not be written back to the underlying file until munmap() is called. The pointer is valid only as long as the FileIo object exists.
int | munmap () override
| Remove a mapping established with mmap(). If the mapped area is writeable, this ensures that changes are written back to the underlying file.
virtual void | setPath (const std::string &path)
| close the file source and set a new path.
size_t | tell () const override
| Get the current file position.
size_t | size () const override
| Flush any buffered writes and get the current file size in bytes.
bool | isopen () const override
| Returns true if the file is open, otherwise false.
int | error () const override
| Returns 0 if the file is in a valid state, otherwise nonzero.
bool | eof () const override
| Returns true if the file position has reached the end, otherwise false.
const std::string & | path () const noexcept override
| Returns the path of the file.
void | populateFakeData () override
| Mark all the bNone blocks to bKnow. This avoids allocating memory for parts of the file that contain image-date (non-metadata/pixel data).
| FileIo (const FileIo &)=delete
| Copy constructor.
FileIo & | operator= (const FileIo &)=delete
| Assignment operator.
Public Member Functions inherited from Exiv2::BasicIo
virtual | ~BasicIo ()=default
| Destructor.
void | readOrThrow (byte *buf, size_t rcount, ErrorCode err=ErrorCode::kerCorruptedMetadata)
| Safe version of read() that checks for errors and throws an exception if the read was unsuccessful.
void | seekOrThrow (int64_t offset, Position pos, ErrorCode err)
| Safe version of seek() that checks for errors and throws an exception if the seek was unsuccessful.

## Static Public Attributes

static constexpr auto | TEMP_FILE_EXT = ".exiv2_temp"
| The extension of the temporary file which is created when getting input data to read metadata. This file will be deleted in destructor.
static constexpr auto | GEN_FILE_EXT = ".exiv2"
| The extension of the generated file which is created when getting input data to add or modify the metadata.

## Static methods

static std::string | writeDataToFile (const std::string &orgPath)
| Read the data from stdin/data uri path and write them to the file.

## Additional Inherited Members

Public Types inherited from Exiv2::BasicIo
enum | Position { beg , cur , end }
| Seek starting positions.
using | UniquePtr = std::unique_ptr<BasicIo>
| BasicIo auto_ptr type.
byte * | bigBlock_ {}
| this is allocated and populated by mmap()

## Detailed Description

Provides binary IO for the data from stdin and data uri path.

## Member Function Documentation

## transfer()

void Exiv2::XPathIo::transfer | ( | BasicIo & | src | ) |

override virtual

Change the name of the temp file and make it untemporary before calling the method of superclass FileIo::transfer.

Reimplemented from Exiv2::FileIo.

## writeDataToFile()

std::string Exiv2::XPathIo::writeDataToFile | ( | const std::string & | orgPath | ) |

static

Read the data from stdin/data uri path and write them to the file.

Parameters

  orgPath | It equals "-" if the input data's from stdin. Otherwise, it's data uri path.

Returns
  the name of the new file.

Exceptions

  Error | if it fails.

The documentation for this class was generated from the following file:

- basicio.hpp