Define an abstract file interface. More...

#include <file.h>

Inheritance diagram for shaka::File:

Public Member Functions
virtual bool	Close ()=0

virtual int64_t	Read (void *buffer, uint64_t length)=0

virtual int64_t	Write (const void *buffer, uint64_t length)=0

virtual int64_t	Size ()=0

virtual bool	Flush ()=0

virtual bool	Seek (uint64_t position)=0

virtual bool	Tell (uint64_t *position)=0

const std::string &	file_name () const

Static Public Member Functions
static File *	Open (const char file_name, const char mode)

static File *	OpenWithNoBuffering (const char file_name, const char mode)

static bool	Delete (const char *file_name)

static int64_t	GetFileSize (const char *file_name)

static bool	ReadFileToString (const char file_name, std::string contents)

static bool	WriteStringToFile (const char *file_name, const std::string &contents)

static bool	WriteFileAtomically (const char *file_name, const std::string &contents)

static bool	Copy (const char from_file_name, const char to_file_name)

static int64_t	CopyFile (File source, File destination)

static int64_t	CopyFile (File source, File destination, int64_t max_copy)

static std::string	MakeCallbackFileName (const BufferCallbackParams &callback_params, const std::string &name)

static bool	ParseCallbackFileName (const std::string &callback_file_name, const BufferCallbackParams *callback_params, std::string name)

Protected Member Functions
	File (const std::string &file_name)

virtual	~File ()

virtual bool	Open ()=0
	Internal open. Should not be used directly.

Friends
class	ThreadedIoFile

Detailed Description

Define an abstract file interface.

Definition at line 26 of file file.h.

Constructor & Destructor Documentation

virtual shaka::File::~File ( )

inlineprotectedvirtual

Do not call the destructor directly (with the "delete" keyword) nor use std::unique_ptr; instead use Close().

Definition at line 170 of file file.h.

Member Function Documentation

virtual bool shaka::File::Close ( )

pure virtual

Flush() and de-allocate resources associated with this file, and delete this File object. THIS IS THE ONE TRUE WAY TO DEALLOCATE THIS OBJECT.

Returns: true on success. For writable files, returning false MAY INDICATE DATA LOSS.

Implemented in shaka::UdpFile, shaka::ThreadedIoFile, shaka::LocalFile, shaka::MemoryFile, and shaka::CallbackFile.

bool shaka::File::Copy	(	const char *	from_file_name,
		const char *	to_file_name
	)

static

Copies files. This is not good for copying huge files. Although not recommended, it is safe to have source file and destination file name be the same.

Parameters

from_file_name	is the source file name.
to_file_name	is the destination file name.

Returns: true on success, false otherwise.

Definition at line 281 of file file.cc.

int64_t shaka::File::CopyFile	(	File *	source,
		File *	destination
	)

static

Copies the contents from source to destination.

Parameters

source	The file to copy from.
destination	The file to copy to.

Returns: Number of bytes written, or a value < 0 on error.

Definition at line 316 of file file.cc.

int64_t shaka::File::CopyFile	(	File *	source,
		File *	destination,
		int64_t	max_copy
	)

static

Copies the contents from source to destination.

Parameters

source	The file to copy from.
destination	The file to copy to.
max_copy	The maximum number of bytes to copy; < 0 to copy to EOF.

Returns: Number of bytes written, or a value < 0 on error.

Definition at line 320 of file file.cc.

bool shaka::File::Delete ( const char * file_name )

static

Delete the specified file.

Parameters

file_name contains the path of the file to be deleted.

Returns: true if successful, false otherwise.

Definition at line 198 of file file.cc.

const std::string& shaka::File::file_name ( ) const

inline

Returns: The file name. Note that the file type prefix has been stripped off.

Definition at line 94 of file file.h.

virtual bool shaka::File::Flush ( )

pure virtual

Flush the file so that recently written data will survive an application crash (but not necessarily an OS crash). For instance, in LocalFile the data is flushed into the OS but not necessarily to disk.

Returns: true on success, false otherwise.

Implemented in shaka::UdpFile, shaka::ThreadedIoFile, shaka::LocalFile, shaka::MemoryFile, and shaka::CallbackFile.

int64_t shaka::File::GetFileSize ( const char * file_name )

static

Returns: The size of a file in bytes on success, a value < 0 otherwise. The file will be opened and closed in the process.

Definition at line 207 of file file.cc.

std::string shaka::File::MakeCallbackFileName	(	const BufferCallbackParams &	callback_params,
		const std::string &	name
	)

static

Generate callback file name. NOTE: THE GENERATED NAME IS ONLY VAID WHILE callback_params IS VALID.

Parameters

callback_params	references BufferCallbackParams, which will be embedded in the generated callback file name.
name	is the name of the buffer, which will be embedded in the generated callback file name.

Definition at line 354 of file file.cc.

File * shaka::File::Open	(	const char *	file_name,
		const char *	mode
	)

static

Open the specified file. This is a file factory method, it opens a proper file automatically based on prefix, e.g. "file://" for LocalFile.

Parameters

file_name	contains the name of the file to be accessed.
mode	contains file access mode. Implementation dependent.

Returns: A File pointer on success, false otherwise.

Definition at line 176 of file file.cc.

File * shaka::File::OpenWithNoBuffering	(	const char *	file_name,
		const char *	mode
	)

static

Open the specified file in direct-access mode (no buffering). This is a file factory method, it opens a proper file automatically based on prefix, e.g. "file://" for LocalFile.

Parameters

file_name	contains the name of the file to be accessed.
mode	contains file access mode. Implementation dependent.

Returns: A File pointer on success, false otherwise.

Definition at line 187 of file file.cc.

bool shaka::File::ParseCallbackFileName	(	const std::string &	callback_file_name,
		const BufferCallbackParams **	callback_params,
		std::string *	name
	)

static

Parse and extract callback params.

Parameters

callback_file_name	is the name of the callback file which contains callback_params and name.
callback_params	points to the parsed BufferCallbackParams pointer.
name	points to the parsed name.

Returns: true on success, false otherwise.

Definition at line 364 of file file.cc.

virtual int64_t shaka::File::Read	(	void *	buffer,
		uint64_t	length
	)

pure virtual

Read data and return it in buffer.

Parameters

[out]	buffer	points to a block of memory with a size of at least length bytes.
	length	indicates number of bytes to be read.

Returns: Number of bytes read, or a value < 0 on error. Zero on end-of-file, or if 'length' is zero.

Implemented in shaka::UdpFile, shaka::ThreadedIoFile, shaka::LocalFile, shaka::MemoryFile, and shaka::CallbackFile.

bool shaka::File::ReadFileToString	(	const char *	file_name,
		std::string *	contents
	)

static

Read the contents of a file into string.

Parameters

file_name	is the file to be read. It should be a valid file.
contents[out]	points to the output string. Should not be NULL.

Returns: true on success, false otherwise.

Definition at line 216 of file file.cc.

virtual bool shaka::File::Seek ( uint64_t position )

pure virtual

Seek to the specifield position in the file.

Parameters

position is the position to seek to.

Returns: true on success, false otherwise.

Implemented in shaka::UdpFile, shaka::ThreadedIoFile, shaka::LocalFile, shaka::MemoryFile, and shaka::CallbackFile.

virtual int64_t shaka::File::Size ( )

pure virtual

Returns: Size of the file in bytes. A return value less than zero indicates a problem getting the size.

Implemented in shaka::UdpFile, shaka::ThreadedIoFile, shaka::LocalFile, shaka::MemoryFile, and shaka::CallbackFile.

virtual bool shaka::File::Tell ( uint64_t * position )

pure virtual

Get the current file position.

Parameters

position is a pointer to contain the current file position upon successful return.

Returns: true on succcess, false otherwise.

Implemented in shaka::UdpFile, shaka::ThreadedIoFile, shaka::LocalFile, shaka::MemoryFile, and shaka::CallbackFile.

virtual int64_t shaka::File::Write	(	const void *	buffer,
		uint64_t	length
	)

pure virtual

Write block of data.

Parameters

buffer	points to a block of memory with at least length bytes.
length	indicates number of bytes to write.

Returns: Number of bytes written, or a value < 0 on error.

Implemented in shaka::UdpFile, shaka::ThreadedIoFile, shaka::LocalFile, shaka::MemoryFile, and shaka::CallbackFile.

bool shaka::File::WriteFileAtomically	(	const char *	file_name,
		const std::string &	contents
	)

static

Save contents to file_name in an atomic manner.

Parameters

file_name	is the destination file name.
contents	is the data to be saved.

Returns: true on success, false otherwise.

Definition at line 262 of file file.cc.

bool shaka::File::WriteStringToFile	(	const char *	file_name,
		const std::string &	contents
	)

static

Writes the data to file.

Parameters

file_name	is the file to write to.
contents	is the data to write.

Returns: true on success, false otherwise.

Definition at line 234 of file file.cc.

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

packager/file/file.h
packager/file/file.cc

Public Member Functions

Static Public Member Functions

Protected Member Functions

Friends

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation