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74 lines
2.4 KiB
C
74 lines
2.4 KiB
C
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/**********************************************************************
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* File: bitstrm.h (Formerly bits.h)
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* Description: R_BITSTREAM and W_BITSTREAM class definitions.
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* Author: Ray Smith
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* Created: Tue Feb 19 10:44:22 GMT 1991
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*
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* (C) Copyright 1991, Hewlett-Packard Ltd.
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** Licensed under the Apache License, Version 2.0 (the "License");
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** you may not use this file except in compliance with the License.
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** You may obtain a copy of the License at
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** http://www.apache.org/licenses/LICENSE-2.0
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** Unless required by applicable law or agreed to in writing, software
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** distributed under the License is distributed on an "AS IS" BASIS,
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** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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** See the License for the specific language governing permissions and
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** limitations under the License.
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*
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**********************************************************************/
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#ifndef BITSTRM_H
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#define BITSTRM_H
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#include "host.h"
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#define BITBUFSIZE 8192 //bitstream buffer
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class DLLSYM R_BITSTREAM
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{
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private:
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int bitfd; //file descriptor
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INT32 bitindex; //current byte
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UINT32 bitword; //current word
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INT32 bitbit; //current bit
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INT32 bufsize; //size of buffer
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UINT8 bitbuf[BITBUFSIZE]; //bitstream buffer
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//for reading codes
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static const UINT16 bitmasks[17];
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public:
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R_BITSTREAM() {
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}; //Null constructor
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UINT16 open( //open to read
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int fd); //file to read
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UINT16 read_code( //read a code
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UINT8 length); //bits to lose
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UINT16 masks( //read a code
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INT32 index); //bits to lose
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};
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class DLLSYM W_BITSTREAM
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{
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private:
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int bitfd; //file descriptor
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INT32 bitindex; //current byte
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UINT32 bitword; //current word
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INT32 bitbit; //current bit
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UINT8 bitbuf[BITBUFSIZE]; //bitstream buffer
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public:
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W_BITSTREAM() {
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}; //Null constructor
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void open( //open to write
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int fd); //file to write
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INT8 write_code( //write a code
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UINT16 code, //code to write
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UINT8 length); //bits to lose
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};
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#endif
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