strintmap.c

电驴下载工具eMule0.47aVeryCD的源代码,可作分析测试也可用于P2P软件的开发研究.

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/************************************************************************
* Purpose: This file contains string to integer and integer to string 
*	conversion functions 
************************************************************************/

#include "strintmap.h"
#include "membuffer.h"

/************************************************************************
*	Function :	map_str_to_int
*
*	Parameters :
*		IN const char* name ;	string containing the name to be matched
*		IN size_t name_len ;	size of the string to be matched
*		IN str_int_entry* table ;	table of entries that need to be 
*					matched.
*		IN int num_entries ; number of entries in the table that need 
*					to be searched.
*		IN xboolean case_sensitive ; whether the case should be case
*					sensitive or not
*
*	Description : Match the given name with names from the entries in the 
*		table. Returns the index of the table when the entry is found.
*
*	Return : int ;
*		index - On Success
*		-1 - On failure
*
*	Note :
************************************************************************/
int
map_str_to_int( IN const char *name,
                IN size_t name_len,
                IN str_int_entry * table,
                IN int num_entries,
                IN xboolean case_sensitive )
{
    int top,
      mid,
      bot;
    int cmp;
    memptr name_ptr;

    name_ptr.buf = ( char * )name;
    name_ptr.length = name_len;

    top = 0;
    bot = num_entries - 1;

    while( top <= bot ) {
        mid = ( top + bot ) / 2;
        if( case_sensitive ) {
            //cmp = strcmp( name, table[mid].name );
            cmp = memptr_cmp( &name_ptr, table[mid].name );
        } else {
            //cmp = strcasecmp( name, table[mid].name );
            cmp = memptr_cmp_nocase( &name_ptr, table[mid].name );
        }

        if( cmp > 0 ) {
            top = mid + 1;      // look below mid
        } else if( cmp < 0 ) {
            bot = mid - 1;      // look above mid
        } else                  // cmp == 0
        {
            return mid;         // match; return table index
        }
    }

    return -1;                  // header name not found
}

/************************************************************************
*	Function :	map_int_to_str
*
*	Parameters :
*		IN int id ;	ID to be matched
*		IN str_int_entry* table ;	table of entries that need to be 
*					matched.
*		IN int num_entries ; number of entries in the table that need 
*					to be searched.
*
*	Description : Returns the index from the table where the id matches 
*		the entry from the table.
*
*	Return : int ;
*
*	Note :
************************************************************************/
int
map_int_to_str( IN int id,
                IN str_int_entry * table,
                IN int num_entries )
{
    int i;

    for( i = 0; i < num_entries; i++ ) {
        if( table[i].id == id ) {
            return i;
        }
    }
    return -1;
}