wxWidgets: wxTarOutputStream Class Reference

| Version: 3.0.5

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wxTarOutputStream Class Reference
Class List by Category » Streams

`#include <wx/tarstrm.h>`

Inheritance diagram for wxTarOutputStream:
[legend]

## Detailed Description

Output stream for writing tar files.

wxTarOutputStream::PutNextEntry() is used to create a new entry in the output tar, then the entry's data is written to the wxTarOutputStream. Another call to wxTarOutputStream::PutNextEntry() closes the current entry and begins the next.

##

Library: wxBase
Category: Streams

See also
  Archive Formats, wxTarEntry, wxTarInputStream

## Public Member Functions
virtual | ~wxTarOutputStream ()
| The destructor calls Close() to finish writing the tar if it has not been called already. More...
bool | Close ()
| Finishes writing the tar, returning true if successful. More...
bool | CloseEntry ()
| Close the current entry. More...
bool | CopyArchiveMetaData (wxTarInputStream &s)
| See wxArchiveOutputStream::CopyArchiveMetaData(). More...
bool | CopyEntry (wxTarEntry *entry, wxTarInputStream &inputStream)
| Takes ownership of entry and uses it to create a new entry in the tar. More...
bool | PutNextDirEntry (const wxString &name, const wxDateTime &dt=wxDateTime::Now())
| Create a new directory entry (see wxArchiveEntry::IsDir()) with the given name and timestamp. More...
bool | PutNextEntry (wxTarEntry *entry)
| Takes ownership of entry and uses it to create a new entry in the tar. More...
bool | PutNextEntry (const wxString &name, const wxDateTime &dt=wxDateTime::Now(), wxFileOffset size=wxInvalidOffset)
| Create a new entry with the given name, timestamp and size. More...
| wxTarOutputStream (wxOutputStream &stream, wxTarFormat format=wxTAR_PAX, wxMBConv &conv=wxConvLocal)
| If the parent stream is passed as a pointer then the new filter stream takes ownership of it. More...
| wxTarOutputStream (wxOutputStream *stream, wxTarFormat format=wxTAR_PAX, wxMBConv &conv=wxConvLocal)
| If the parent stream is passed as a pointer then the new filter stream takes ownership of it. More...
int | GetBlockingFactor () const
| The tar is zero padded to round its size up to BlockingFactor * 512 bytes. More...
void | SetBlockingFactor (int factor)
| The tar is zero padded to round its size up to BlockingFactor * 512 bytes. More...
Public Member Functions inherited from wxArchiveOutputStream
virtual | ~wxArchiveOutputStream ()
| Calls Close() if it has not already been called. More...
virtual bool | CopyArchiveMetaData (wxArchiveInputStream &stream)=0
| Some archive formats have additional meta-data that applies to the archive as a whole. More...
virtual bool | CopyEntry (wxArchiveEntry *entry, wxArchiveInputStream &stream)=0
| Takes ownership of entry and uses it to create a new entry in the archive. More...
virtual bool | PutNextEntry (wxArchiveEntry *entry)=0
| Takes ownership of entry and uses it to create a new entry in the archive. More...
Public Member Functions inherited from wxFilterOutputStream
| wxFilterOutputStream (wxOutputStream &stream)
| Initializes a "filter" stream. More...
| wxFilterOutputStream (wxOutputStream *stream)
| Initializes a "filter" stream. More...
Public Member Functions inherited from wxOutputStream
| wxOutputStream ()
| Creates a dummy wxOutputStream object. More...
virtual | ~wxOutputStream ()
| Destructor. More...
virtual size_t | LastWrite () const
| Returns the number of bytes written during the last Write(). More...
void | PutC (char c)
| Puts the specified character in the output queue and increments the stream position. More...
virtual wxFileOffset | SeekO (wxFileOffset pos, wxSeekMode mode=wxFromStart)
| Changes the stream current position. More...
virtual wxFileOffset | TellO () const
| Returns the current stream position. More...
virtual wxOutputStream & | Write (const void *buffer, size_t size)
| Writes up to the specified amount of bytes using the data of buffer. More...
wxOutputStream & | Write (wxInputStream &stream_in)
| Reads data from the specified input stream and stores them in the current stream. More...
bool | WriteAll (const void *buffer, size_t size)
| Writes exactly the specified number of bytes from the buffer. More...
Public Member Functions inherited from wxStreamBase
| wxStreamBase ()
| Creates a dummy stream object. More...
virtual | ~wxStreamBase ()
| Destructor. More...
wxStreamError | GetLastError () const
| This function returns the last error. More...
virtual wxFileOffset | GetLength () const
| Returns the length of the stream in bytes. More...
virtual size_t | GetSize () const
| This function returns the size of the stream. More...
virtual bool | IsOk () const
| Returns true if no error occurred on the stream. More...
virtual bool | IsSeekable () const
| Returns true if the stream supports seeking to arbitrary offsets. More...
void | Reset (wxStreamError error=wxSTREAM_NO_ERROR)
| Resets the stream state. More...
bool | operator! () const
| Returns the opposite of IsOk(). More...

## Additional Inherited Members
Protected Member Functions inherited from wxOutputStream
size_t | OnSysWrite (const void *buffer, size_t bufsize)
| Internal function. More...
Protected Member Functions inherited from wxStreamBase
virtual wxFileOffset | OnSysSeek (wxFileOffset pos, wxSeekMode mode)
| Internal function. More...
virtual wxFileOffset | OnSysTell () const
| Internal function. More...

## Constructor & Destructor Documentation

wxTarOutputStream::wxTarOutputStream | ( | wxOutputStream & | stream,
|  | wxTarFormat | format = `wxTAR_PAX`,
|  | wxMBConv & | conv = `wxConvLocal`
| ) |  |

If the parent stream is passed as a pointer then the new filter stream takes ownership of it.

If it is passed by reference then it does not.

In a Unicode build the third parameter conv is used to translate the headers fields into an 8-bit encoding. It has no effect on the stream's data.

When the format is wxTAR_PAX, pax extended headers are generated when any header field will not fit the standard tar header block or if it uses any non-ascii characters.

Extended headers are stored as extra 'files' within the tar, and will be extracted as such by any other tar program that does not understand them. The conv parameter only affect the standard tar headers, the extended headers are always UTF-8 encoded.

When the format is wxTAR_USTAR, no extended headers are generated, and instead a warning message is logged if any header field overflows.

wxTarOutputStream::wxTarOutputStream | ( | wxOutputStream * | stream,
|  | wxTarFormat | format = `wxTAR_PAX`,
|  | wxMBConv & | conv = `wxConvLocal`
| ) |  |

If the parent stream is passed as a pointer then the new filter stream takes ownership of it.

If it is passed by reference then it does not.

In a Unicode build the third parameter conv is used to translate the headers fields into an 8-bit encoding. It has no effect on the stream's data.

When the format is wxTAR_PAX, pax extended headers are generated when any header field will not fit the standard tar header block or if it uses any non-ascii characters.

Extended headers are stored as extra 'files' within the tar, and will be extracted as such by any other tar program that does not understand them. The conv parameter only affect the standard tar headers, the extended headers are always UTF-8 encoded.

When the format is wxTAR_USTAR, no extended headers are generated, and instead a warning message is logged if any header field overflows.

virtual wxTarOutputStream::~wxTarOutputStream | ( |  | ) |
| virtual

The destructor calls Close() to finish writing the tar if it has not been called already.

## Member Function Documentation

bool wxTarOutputStream::Close | ( |  | ) |
| virtual

Finishes writing the tar, returning true if successful.

Called by the destructor if not called explicitly.

Reimplemented from wxArchiveOutputStream.

bool wxTarOutputStream::CloseEntry | ( |  | ) |
| virtual

Close the current entry.

It is called implicitly whenever another new entry is created with CopyEntry() or PutNextEntry(), or when the tar is closed.

Implements wxArchiveOutputStream.

bool wxTarOutputStream::CopyArchiveMetaData | ( | wxTarInputStream & | s | ) |

See wxArchiveOutputStream::CopyArchiveMetaData().

For the tar format this function does nothing.

bool wxTarOutputStream::CopyEntry | ( | wxTarEntry * | entry,
|  | wxTarInputStream & | inputStream
| ) |  |

Takes ownership of entry and uses it to create a new entry in the tar.

entry is then opened in inputStream and its contents copied to this stream.

For some other archive formats CopyEntry() is much more efficient than transferring the data using Read() and Write() since it will copy them without decompressing and recompressing them. For tar however it makes no difference.

For tars on seekable streams, entry must be from the same tar file as inputStream. For non-seekable streams, entry must also be the last thing read from inputStream.

int wxTarOutputStream::GetBlockingFactor | ( |  | ) | const

The tar is zero padded to round its size up to BlockingFactor * 512 bytes.

The blocking factor defaults to 10 for wxTAR_PAX and 20 for wxTAR_USTAR (see wxTarOutputStream()), as specified in the POSIX standards.

bool wxTarOutputStream::PutNextDirEntry | ( | const wxString & | name,
|  | const wxDateTime & | dt = `wxDateTime::Now()`
| ) |  |
| virtual

Create a new directory entry (see wxArchiveEntry::IsDir()) with the given name and timestamp.

PutNextEntry() can also be used to create directory entries, by supplying a name with a trailing path separator.

Implements wxArchiveOutputStream.

bool wxTarOutputStream::PutNextEntry | ( | wxTarEntry * | entry | ) |

Takes ownership of entry and uses it to create a new entry in the tar.

bool wxTarOutputStream::PutNextEntry | ( | const wxString & | name,
|  | const wxDateTime & | dt = `wxDateTime::Now()`,
|  | wxFileOffset | size = `wxInvalidOffset`
| ) |  |
| virtual

Create a new entry with the given name, timestamp and size.

Implements wxArchiveOutputStream.

void wxTarOutputStream::SetBlockingFactor | ( | int | factor | ) |

The tar is zero padded to round its size up to BlockingFactor * 512 bytes.

The blocking factor defaults to 10 for wxTAR_PAX and 20 for wxTAR_USTAR (see wxTarOutputStream()), as specified in the POSIX standards.