greenplumn bitstream 源码
greenplumn bitstream 代码
文件路径：/src/include/utils/bitstream.h
/*------------------------------------------------------------------------------
*
* bitstream
*
* A in-memory bitstream implementation.
* Useful for reading and writing individual bits from a char buffer
*
* Copyright (c) 2013-Present VMware, Inc. or its affiliates.
*
*
* IDENTIFICATION
* src/include/utils/bitstream.h
*
*------------------------------------------------------------------------------
*/
#ifndef CDB_BITSTREAM_H
#define CDB_BITSTREAM_H
/*
* Data structure implementing a bitstream abstraction.
*
* A bitstream is used to read and write individual bits from a data buffer
* conveniently.
*/
typedef struct Bitstream
{
/*
* Offset within the current byte
*/
int bitOffset;
/*
* Offset to the start of the data pointer
*/
int byteOffset;
/*
* Data buffer to read from or write to.
*/
unsigned char* data;
/*
* Size of the data buffer.
* The bitstream should never read or write beyond the data size.
*/
int dataSize;
/*
* Error flag.
*/
bool error;
} Bitstream;
void Bitstream_Init(Bitstream *bitstream, unsigned char* data, int dataSize);
int Bitstream_GetOffset(Bitstream *bitstream);
bool Bitstream_Get(Bitstream *bitstream, int n, uint32 *value);
bool Bitstream_Put(Bitstream *bitstream, uint32_t v, int bitCount);
bool Bitstream_HasError(Bitstream *bitstream);
bool Bitstream_Skip(Bitstream* bitstream, int skipBitCount);
bool Bitstream_Align(Bitstream *bitstream, int alignment);
unsigned char* Bitstream_GetAlignedData(Bitstream *bitstream, int alignment);
int Bitstream_GetRemaining(Bitstream *bitstream);
int Bitstream_GetLength(Bitstream *bitstream);
#endif
相关信息
相关文章
0
赞
热门推荐
-
2、 - 优质文章
-
3、 gate.io
-
7、 golang
-
9、 openharmony
-
10、 Vue中input框自动聚焦