W_BITSTREAM Class Reference

#include <bitstrm.h>

List of all members.

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Detailed Description

Class for writing image after processing.

Definition at line 61 of file bitstrm.h.

Public Member Functions

• void open (int fd)
• W_BITSTREAM ()
• INT8 write_code (UINT16 code, UINT8 length)

Private Attributes

• INT32 bitbit

  Current bit.
  

• UINT8 bitbuf [BITBUFSIZE]

  Bitstream buffer.
  

• int bitfd

  File descriptor.
  

• INT32 bitindex

  Current byte.
  

• UINT32 bitword

  Current word.
  

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Constructor & Destructor Documentation

W_BITSTREAM::W_BITSTREAM

(

)

[inline]

Definition at line 76 of file bitstrm.h.

                  { 
    };                           //Null constructor

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Member Function Documentation

void W_BITSTREAM::open

(

int

fd

)

Establish a bitstream for writing.

Definition at line 94 of file bitstrm.cpp.

References bitbit, bitfd, bitindex, and bitword.

                        {
  bitfd = fd;
  bitindex = 0;
  bitword = 0;
  bitbit = 0;
}

INT8 W_BITSTREAM::write_code	(	UINT16	code,
		UINT8	length
	)

Add a code to the bitstream.

Definition at line 107 of file bitstrm.cpp.

References bitbit, bitbuf, BITBUFSIZE, bitfd, bitindex, bitword, ERRCODE::error(), LOG, NULL, and WRITEFAILED.

                              {
  if (length == 0) {
                                 //flushing
    if (bitbit > 0)
                                 //get last byte
      bitbuf[bitindex++] = (UINT8) bitword;
    if ((bitindex > 0) &&
      (write (bitfd, (char *) bitbuf, bitindex * sizeof (UINT8)) !=
    (INT32) (bitindex * sizeof (UINT8)))) {
      WRITEFAILED.error ("W_BITSTREAM::write_code", LOG, "Flushing");
      return -1;
    }
  }
  else {
    bitword |= code << bitbit;   //add new code
    bitbit += length;
    while (bitbit >= 8) {
                                 //get next byte
      bitbuf[bitindex++] = (UINT8) bitword;
      bitbit -= 8;
      bitword >>= 8;
      if (bitindex >= BITBUFSIZE) {
        if (write (bitfd, (char *) bitbuf, bitindex * sizeof (UINT8))
        != (INT32) (bitindex * sizeof (UINT8))) {
          WRITEFAILED.error ("W_BITSTREAM::write_code", LOG, NULL);
          return -1;
        }
        bitindex = 0;            //newly filled buffer
      }
    }
  }
  return 0;                      //success
}

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Member Data Documentation

INT32 W_BITSTREAM::bitbit [private]

Current bit.

Definition at line 71 of file bitstrm.h.

Referenced by open(), and write_code().

UINT8 W_BITSTREAM::bitbuf[BITBUFSIZE] [private]

Bitstream buffer.

Definition at line 73 of file bitstrm.h.

Referenced by write_code().

int W_BITSTREAM::bitfd [private]

File descriptor.

Definition at line 65 of file bitstrm.h.

Referenced by open(), and write_code().

INT32 W_BITSTREAM::bitindex [private]

Current byte.

Definition at line 67 of file bitstrm.h.

Referenced by open(), and write_code().

UINT32 W_BITSTREAM::bitword [private]

Current word.

Definition at line 69 of file bitstrm.h.

Referenced by open(), and write_code().

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

• image/bitstrm.h
• image/bitstrm.cpp

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