BIO - Individual bit input-output stream


Data Structures

struct  opj_bio
 Individual bit input-output stream (BIO). More...

Local static functions

static void bio_putbit (opj_bio_t *bio, unsigned int b)
 Write a bit.
static int bio_getbit (opj_bio_t *bio)
 Read a bit.
static int bio_byteout (opj_bio_t *bio)
 Write a byte.
static int bio_bytein (opj_bio_t *bio)
 Read a byte.

Exported functions

opj_bio_tbio_create (void)
 Create a new BIO handle.
void bio_destroy (opj_bio_t *bio)
 Destroy a previously created BIO handle.
int bio_numbytes (opj_bio_t *bio)
 Number of bytes written.
void bio_init_enc (opj_bio_t *bio, unsigned char *bp, int len)
 Init encoder.
void bio_init_dec (opj_bio_t *bio, unsigned char *bp, int len)
 Init decoder.
void bio_write (opj_bio_t *bio, int v, int n)
 Write bits.
int bio_read (opj_bio_t *bio, int n)
 Read bits.
int bio_flush (opj_bio_t *bio)
 Flush bits.
int bio_inalign (opj_bio_t *bio)
 Passes the ending bits (coming from flushing).

Typedefs

typedef struct opj_bio opj_bio_t
 Individual bit input-output stream (BIO).

Typedef Documentation

typedef struct opj_bio opj_bio_t

Individual bit input-output stream (BIO).


Function Documentation

static int bio_bytein ( opj_bio_t bio  )  [static]

Read a byte.

Parameters:
bio BIO handle
Returns:
Returns 0 if successful, returns 1 otherwise

References opj_bio::bp, opj_bio::buf, opj_bio::ct, and opj_bio::end.

Referenced by bio_getbit(), and bio_inalign().

static int bio_byteout ( opj_bio_t bio  )  [static]

Write a byte.

Parameters:
bio BIO handle
Returns:
Returns 0 if successful, returns 1 otherwise

References opj_bio::bp, opj_bio::buf, opj_bio::ct, and opj_bio::end.

Referenced by bio_flush(), and bio_putbit().

opj_bio_t* bio_create ( void   ) 

Create a new BIO handle.

Returns:
Returns a new BIO handle if successful, returns NULL otherwise

References opj_malloc.

Referenced by t2_decode_packet(), and t2_encode_packet().

void bio_destroy ( opj_bio_t bio  ) 

Destroy a previously created BIO handle.

Parameters:
bio BIO handle to destroy

References opj_free.

Referenced by t2_decode_packet(), and t2_encode_packet().

int bio_flush ( opj_bio_t bio  ) 

Flush bits.

Parameters:
bio BIO handle
Returns:
Returns 1 if successful, returns 0 otherwise

References bio_byteout(), and opj_bio::ct.

Referenced by t2_encode_packet().

static int bio_getbit ( opj_bio_t bio  )  [static]

Read a bit.

Parameters:
bio BIO handle
Returns:
Returns the read bit

References bio_bytein(), opj_bio::buf, and opj_bio::ct.

Referenced by bio_read().

int bio_inalign ( opj_bio_t bio  ) 

Passes the ending bits (coming from flushing).

Parameters:
bio BIO handle
Returns:
Returns 1 if successful, returns 0 otherwise

References bio_bytein(), opj_bio::buf, and opj_bio::ct.

Referenced by t2_decode_packet().

void bio_init_dec ( opj_bio_t bio,
unsigned char *  bp,
int  len 
)

Init decoder.

Parameters:
bio BIO handle
bp Input buffer
len Input buffer length

References opj_bio::bp, opj_bio::buf, opj_bio::ct, opj_bio::end, and opj_bio::start.

Referenced by t2_decode_packet().

void bio_init_enc ( opj_bio_t bio,
unsigned char *  bp,
int  len 
)

Init encoder.

Parameters:
bio BIO handle
bp Output buffer
len Output buffer length

References opj_bio::bp, opj_bio::buf, opj_bio::ct, opj_bio::end, and opj_bio::start.

Referenced by t2_encode_packet().

int bio_numbytes ( opj_bio_t bio  ) 

Number of bytes written.

Parameters:
bio BIO handle
Returns:
Returns the number of bytes written

References opj_bio::bp, and opj_bio::start.

Referenced by t2_decode_packet(), and t2_encode_packet().

static void bio_putbit ( opj_bio_t bio,
unsigned int  b 
) [static]

Write a bit.

Parameters:
bio BIO handle
b Bit to write (0 or 1)

References bio_byteout(), opj_bio::buf, and opj_bio::ct.

Referenced by bio_write().

int bio_read ( opj_bio_t bio,
int  n 
)

Read bits.

Parameters:
bio BIO handle
n Number of bits to read
Returns:
Returns the corresponding read number

References bio_getbit().

Referenced by t2_decode_packet(), t2_getcommacode(), t2_getnumpasses(), and tgt_decode().

void bio_write ( opj_bio_t bio,
int  v,
int  n 
)

Write bits.

Parameters:
bio BIO handle
v Value of bits
n Number of bits to write

References bio_putbit().

Referenced by t2_encode_packet(), t2_putcommacode(), t2_putnumpasses(), and tgt_encode().


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