ibitstream Class Reference

Input bit stream. More...

Inheritance diagram for ibitstream:

List of all members.

Public Member Functions
	ibitstream (FILE *file, int buffersize=DEFAULT_IOBUFFER_SIZE)
	Start ibitstream using a FILE ptr to an open file.
	ibitstream (const char *filename, int buffersize=DEFAULT_IOBUFFER_SIZE)
	Start inputbitstream by filename.
	~ibitstream ()
	Destructor only uses base class destructor.
void	setupstream ()
	Allocate a buffer and set up all pointers, then fill buffer.
void	windup ()
	Put the current word to the buffer with upper 0 bits as needed.
virtual void	print () const
	Print buffer contents.
virtual int	get_bytes_used ()
	Return the number of bytes used so far in this stream.
Word_t	readbits (int nbits)
	Read data from the buffer as unsigned ints.
int32_t	readbits_int (int nbits)
	Read data from the buffer as (signed) ints.
Word_t	read_unary ()
	Read a single unary-coded value.
int	readstring (char *s, int count=-1)
	Read a null-terminated string of 8-bit characters from the bit stream.
Private Member Functions
void	next_word ()
	Move to next word in buffer, refilling it if needed.
int	fill ()
	Fill the read buffer and reset for more data.
Private Attributes
Word_t	partial_word
int	partial_word_bitptr

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Detailed Description

Input bit stream.

Allows you to read data N bits at a time with buffered reading.

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Member Function Documentation

int ibitstream::fill

(

)

[private]

Fill the read buffer and reset for more data.

Returns:

Bytes read from disk.

References bitstream::beyondbuffer, bitstream::bitptr, bitstream::buf_used, bitstream::buffer_base, bitstream::buffptr, bitstream::bufsize, and bitstream::fp.

Referenced by next_word(), and setupstream().

Word_t ibitstream::read_unary

(

)

Read a single unary-coded value.

Returns:

The unary-coded value from the stream.

References readbits().

Referenced by mexp_golomb_read_u32().

Word_t ibitstream::readbits

(

int

n_bits

)

Read data from the buffer as unsigned ints.

Parameters:

n_bits

Number of bits to use

Returns:

Data read (in the lowest n_bits bits).

References bitstream::bitptr, bitstream::Bits_per_word, bitstream::buffptr, and next_word().

Referenced by mexp_golomb_read_u32(), read_unary(), readbits_int(), readstring(), and windup().

int ibitstream::readbits_int

(

int

n_bits

)

Read data from the buffer as (signed) ints.

Parameters:

n_bits

Number of bits to read.

Returns:

The data read from the stream.

References readbits().

int ibitstream::readstring	(	char *	s,
		int	count = -1
	)

Read a null-terminated string of 8-bit characters from the bit stream.

Parameters:

s	Pointer to the string (must be available memory).
count	Maximum size of the string.

Returns:

Number of chars read (including null).

References readbits().

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

• /usr/src/RPM/BUILD/slim_2.6.4/src/bitstream.h
• /usr/src/RPM/BUILD/slim_2.6.4/src/bitstream.cpp