md5::digest_stream Class Reference

A class that calculates an md5 digest from a data stream using the algorithm described by RFC 1321. More...

#include <md5.h>

Classes
struct	state_type
	Holds the state of an md5 digest stream. Used by md5::digest_stream. More...

Public Member Functions
	digest_stream ()
	Default constructor.
	digest_stream (digest::state_type d, small_t n)
	Constructor taking state() allowing digest calculation to be suspended and resumed. More...
void	add (const string_type &)
	Adds more message data.
void	close ()
	Called after the last add().
small_t	size () const
	Returns how many data bytes have been accumulated so far. More...
state_type	state () const
	Returns the current state. More...

Detailed Description

A class that calculates an md5 digest from a data stream using the algorithm described by RFC 1321.

The implementation is layered on top of the block-oriented md5::digest by adding an element of buffering. The buffering allows incremental calculation of an md5 digest without requiring either the complete input string or precise 64-byte blocks.

std::string hash( std::istream & in )
{
    md5::digest_stream d ;
    while( in.good() )
    {
        std::string line ;
        std::getline( in , line ) ;
        d.add( line ) ;
    }
    d.close() ;
    return md5::format::rfc( d ) ;
}

Definition at line 238 of file md5.h.

Constructor & Destructor Documentation

md5::digest_stream::digest_stream	(	digest::state_type	d,
		small_t	n
	)

Constructor taking state() allowing digest calculation to be suspended and resumed.

The 'n' parameter must be a multiple of sixty-four (since "state_type::s" string is implicitly empty).

Definition at line 386 of file md5.cpp.

Member Function Documentation

md5::small_t md5::digest_stream::size

(

)

const

Returns how many data bytes have been accumulated so far.

Definition at line 421 of file md5.cpp.

md5::digest_stream::state_type md5::digest_stream::state

(

)

const

Returns the current state.

Only useful after close().

Definition at line 412 of file md5.cpp.

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

• /home/graeme/videotools/src/glib/md5.h
• /home/graeme/videotools/src/glib/md5.cpp