xstream::base64::istreambuf Class Reference

Base64 decode stream class. More...

#include <base64.h>

Inheritance diagram for xstream::base64::istreambuf:

Public Member Functions
	istreambuf (std::streambuf *sb, unsigned int width=76, char delimiter='\n')
	construct using a streambuf More...
	~istreambuf ()
	closes the base64 stream More...

Private Member Functions
int	underflow ()
	requests that input buffer be reloaded (overloaded from streambuf) More...

Private Attributes
std::streambuf *	_sb
bool	end
char	delim
unsigned int	delim_w
unsigned int	col
char	buf [3]

Detailed Description

Base64 decode stream class.

decodes data encoded in base64 and makes it available for reading. Only 4 bytes buffered at a time, and this is not configurable

Todo:

xsgetn support

Definition at line 106 of file base64.h.

Constructor & Destructor Documentation

xstream::base64::istreambuf::istreambuf	(	std::streambuf *	sb,
		unsigned int	width = 76,
		char	delimiter = '\n'
	)

construct using a streambuf

Parameters

sb	streambuf where to read the encoded data from
width	width in bytes of lines (=0 for unlimited lines)
delimiter	char to delimit the lines

the parameters need to be the same specified at encoding or it will throw an exception indicating invalid data width=76 and delim=newline are default because they are the values in the RFC

if data is not delimited exactly at width characters with a newline, decoding will throw an exception. RFC specifies that whitespace should be ignored but this library is very strict when decoding, interpreting spurious whitespace as an error.

Definition at line 186 of file base64.cpp.

References buf, and LOG.

xstream::base64::istreambuf::~istreambuf

(

)

closes the base64 stream

Definition at line 255 of file base64.cpp.

References LOG.

Member Function Documentation

int xstream::base64::istreambuf::underflow ( )

private

requests that input buffer be reloaded (overloaded from streambuf)

Definition at line 192 of file base64.cpp.

References _sb, buf, col, xstream::base64::decode(), delim, delim_w, end, xstream::base64::eof, and LOG.

Member Data Documentation

std::streambuf* xstream::base64::istreambuf::_sb

private

stream to read from

Definition at line 108 of file base64.h.

Referenced by underflow().

char xstream::base64::istreambuf::buf[3]

private

buffer to store decoded data

Definition at line 113 of file base64.h.

Referenced by istreambuf(), and underflow().

unsigned int xstream::base64::istreambuf::col

private

Definition at line 112 of file base64.h.

Referenced by underflow().

char xstream::base64::istreambuf::delim

private

Definition at line 110 of file base64.h.

Referenced by underflow().

unsigned int xstream::base64::istreambuf::delim_w

private

Definition at line 111 of file base64.h.

Referenced by underflow().

bool xstream::base64::istreambuf::end

private

signals if stream has reached the end

Definition at line 109 of file base64.h.

Referenced by underflow().

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

• base64.h
• base64.cpp