glibmm: Glib::Checksum Class Reference

Computes the checksum for data. More...

#include <glibmm/checksum.h>

Public Types
enum	ChecksumType { CHECKSUM_MD5, CHECKSUM_SHA1, CHECKSUM_SHA256 }
Public Member Functions
	Checksum ()
	Checksum (GChecksum* castitem, bool make_a_copy=false)
	Checksum (const Checksum& src)
Checksum&	operator= (const Checksum& src)
	~Checksum ()
GChecksum*	gobj ()
const GChecksum*	gobj () const
GChecksum*	gobj_copy () const
	Provides access to the underlying C instance. The caller is responsible for freeing it. Use when directly setting fields in structs.
	Checksum (ChecksumType checksum_type)
	Creates a new Checksum, using the checksum algorithm checksum_type.
	operator bool () const
	Returns true if the Checksum object is valid.
void	reset ()
	Resets the state of the checksum back to its initial state.
void	update (const guchar* data, gsize length)
	Feeds data into an existing Checksum.
void	update (const std::string& data)
	Feeds data into an existing Checksum.
void	get_digest (guint8* buffer, gsize* digest_len) const
	Gets the digest from checksum as a raw binary vector and places it into buffer.
std::string	get_string () const
	Gets the digest as an hexadecimal string.
Static Public Member Functions
static std::string	compute_checksum (ChecksumType type, const guchar* data, gsize length)
	Computes the checksum for a binary data of length.
static std::string	compute_checksum (ChecksumType type, const std::string& str)
	Computes the checksum of a string.
static gssize	get_length (ChecksumType checksum_type)
	Gets the length in bytes of digests of type checksum_type.
Protected Attributes
GChecksum*	gobject_
Related Functions
(Note that these are not member functions.)
Glib::Checksum	wrap (GChecksum* object, bool take_copy=false)
	A Glib::wrap() method for this object.

Detailed Description

Computes the checksum for data.

This is a generic API for computing checksums (or "digests") for a sequence of arbitrary bytes, using various hashing algorithms like MD5, SHA-1 and SHA-256. Checksums are commonly used in various environments and specifications.

glibmm supports incremental checksums by calling update() as long as there's data available and then using get_string() or get_digest() to compute the checksum and return it either as a string in hexadecimal form, or as a raw sequence of bytes. To compute the checksum for binary blobs and NULL-terminated strings in one go, use the static compute_checksum() convenience functions().

Since glibmm 2.16:

Member Enumeration Documentation

enum Glib::Checksum::ChecksumType

Enumerator:

CHECKSUM_MD5
CHECKSUM_SHA1
CHECKSUM_SHA256

Constructor & Destructor Documentation

Glib::Checksum::Checksum ( )

Glib::Checksum::Checksum	(	GChecksum *	castitem,
		bool	make_a_copy = `false`
	)		`[explicit]`

Glib::Checksum::Checksum ( const Checksum& src )

Glib::Checksum::~Checksum ( )

Glib::Checksum::Checksum ( ChecksumType checksum_type ) [explicit]

Creates a new Checksum, using the checksum algorithm checksum_type.

If the checksum_type is not known, then operator bool() will return false.

Parameters:

type	checksum type, one of defined above.

Member Function Documentation

static std::string Glib::Checksum::compute_checksum	(	ChecksumType	type,
		const guchar *	data,
		gsize	length
	)		`[static]`

Computes the checksum for a binary data of length.

This is a convenience wrapper for g_checksum_new(), g_checksum_get_string() and g_checksum_free().

The hexadecimal string returned will be in lower case.

Since glibmm 2.16:

Parameters:

checksum_type	A ChecksumType.
data	Binary blob to compute the digest of.
length	Length of data.

Returns:: The digest of the binary data as a string in hexadecimal. The returned string should be freed with g_free() when done using it.

static std::string Glib::Checksum::compute_checksum	(	ChecksumType	type,
		const std::string &	str
	)		`[static]`

Computes the checksum of a string.

Parameters:

checksum_type	A ChecksumType
str	The string to compute the checksum of.

Returns:: The checksum as a hexadecimal string.

void Glib::Checksum::get_digest	(	guint8 *	buffer,
		gsize *	digest_len
	)		const

Gets the digest from checksum as a raw binary vector and places it into buffer.

The size of the digest depends on the type of checksum.

Once this function has been called, the Checksum is closed and can no longer be updated with g_checksum_update().

Since glibmm 2.16:

Parameters:

buffer	Output buffer.
digest_len	An inout parameter. The caller initializes it to the size of buffer. After the call it contains the length of the digest.

static gssize Glib::Checksum::get_length ( ChecksumType checksum_type ) [static]

Gets the length in bytes of digests of type checksum_type.

Parameters:

checksum_type A ChecksumType.

Returns:: The checksum length, or -1 if checksum_type is not supported.

std::string Glib::Checksum::get_string ( ) const

Gets the digest as an hexadecimal string.

Once this function has been called the Checksum can no longer be updated with g_checksum_update().

The hexadecimal characters will be lower case.

Since glibmm 2.16:

Returns:: The hexadecimal representation of the checksum. The returned string is owned by the checksum and should not be modified or freed.

GChecksum* Glib::Checksum::gobj ( ) [inline]

const GChecksum* Glib::Checksum::gobj ( ) const [inline]

GChecksum* Glib::Checksum::gobj_copy ( ) const

Provides access to the underlying C instance. The caller is responsible for freeing it. Use when directly setting fields in structs.

Glib::Checksum::operator bool ( ) const

Returns true if the Checksum object is valid.

This will return false, for instance, if an unsupported checksum type was provided to the constructor.

Checksum& Glib::Checksum::operator= ( const Checksum& src )

void Glib::Checksum::reset ( )

Resets the state of the checksum back to its initial state.

Since glibmm 2.18:

void Glib::Checksum::update ( const std::string & data )

Feeds data into an existing Checksum.

The checksum must still be open, that is get_string() or get_digest() must not have been called on the checksum.

Parameters:

data	Buffer used to compute the checksum

void Glib::Checksum::update	(	const guchar *	data,
		gsize	length
	)

Feeds data into an existing Checksum.

The checksum must still be open, that is g_checksum_get_string() or g_checksum_get_digest() must not have been called on checksum.

Since glibmm 2.16:

Parameters:

data	Buffer used to compute the checksum.
length	Size of the buffer, or -1 if it is a null-terminated string.

Friends And Related Function Documentation

Glib::Checksum wrap	(	GChecksum *	object,
		bool	take_copy = `false`
	)		`[related]`

A Glib::wrap() method for this object.

Parameters:

object	The C instance.
take_copy	False if the result should take ownership of the C instance. True if it should take a new copy or ref.

Returns:: A C++ instance that wraps this C instance.

Member Data Documentation

GChecksum* Glib::Checksum::gobject_ [protected]

glibmm: Glib::Checksum Class Reference

Public Types

Public Member Functions

Static Public Member Functions

Protected Attributes

Related Functions

Detailed Description

Member Enumeration Documentation

Constructor & Destructor Documentation

Member Function Documentation

Friends And Related Function Documentation

Member Data Documentation