bitmap.h

来自「eC++编译器源码」· C头文件 代码 · 共 47 行

#pragma BitMap

/* This module deals with any kind of bit map that is implemeted using BITSETs or 
   anything that can be manipulated like BITSETs  */
int GetBit(unsigned int &bar[],unsigned int start);
/* Gets a bit out of the map and returns its index if successful, else -1. 
     It begins searching the map from index 'start' for a free bit */

void FreeBit(unsigned int &bar[],unsigned int index);
/* Returns a specific bit to the bitmap at index 'index' */

void FreeMap(unsigned int &bar[]);
/* Initializes a bitmap so that all bits are free */

void FreeNBit(unsigned int &bar[],unsigned int index,unsigned int count);
/* Returns 'count' number of consecutive bits to the map at index 'index' */

boolean GetFixBit(unsigned int &bar[],unsigned int index);
/* Gets a particular bit from the map and returns TRUE if successful, else FALSE */

boolean GetNFixBit(unsigned int &bar[],unsigned int index,unsigned int count);
/* Gets 'count' number of consecutive bits from the map starting at 'index' and 
     returns TRUE if successful, else FALSE */
int GetNBit(unsigned int &bar[], unsigned int start, unsigned int count);
/* Gets 'count' number of consecutive bits from the map and starts searching from 
     'start'. It returns index of starting position if successful, else -1 */

unsigned int Remainder(unsigned int &bar[]);
/* Returns the count of the consecutive bits which end at the last index position 
     of the map */

boolean CheckNBit(unsigned int &bar[],unsigned int &start,unsigned int count);
/* Returns TRUE if it is possible to get 'count' number of consecutive bits from 
     the map starting the searching from 'start', else FALSE */

boolean CheckNFixBit(unsigned int &bar[],unsigned int index, unsigned int count);
/* Returns TRUE if it is possible to get 'count' number of consecutive  bits from 
     the map at index 'start' onwards, else FALSE */

boolean CheckBit(unsigned int &bar[],unsigned int &start);
/* Returns TRUE if it is possible to get a bit from  the map starting the scan from 
     index 'start', else FALSE */

boolean CheckFixBit(unsigned int &bar[],unsigned int index);
/* Returns TRUE if it is possible to get a bit from the map at index 'index', else
     FALSE */