mirror of
https://github.com/alliedmodders/amxmodx.git
synced 2024-12-26 14:55:36 +03:00
56 lines
1.8 KiB
C
Executable File
56 lines
1.8 KiB
C
Executable File
/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 2; tab-width: 2 -*- */
|
|
/* GeoIPBitReader.c
|
|
*
|
|
* Copyright (C) 2002 MaxMind.com. All Rights Reserved.
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2 of the License, or (at your option) any later version.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public
|
|
* License along with this library; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
|
|
#include "GeoIPBitReader.h"
|
|
|
|
GeoIPBitReader * GeoIPBitReader_new(const char * filename) {
|
|
GeoIPBitReader *gibr = (GeoIPBitReader *)malloc(sizeof(GeoIPBitReader));
|
|
gibr->GeoIPBitFH = fopen(filename,"rb");
|
|
if (gibr->GeoIPBitFH == NULL) {
|
|
fprintf(stderr, "Error Opening file %s\n",filename);
|
|
return NULL;
|
|
}
|
|
gibr->position = 8;
|
|
return gibr;
|
|
}
|
|
|
|
unsigned long GeoIPBitReader_read(GeoIPBitReader * gibr, short int numBits) {
|
|
unsigned long num = 0;
|
|
int i, bit;
|
|
int bytes_read;
|
|
|
|
for (i = 0; i < numBits; ++i) {
|
|
if (BITS_IN_BYTE == gibr->position) {
|
|
/* read in next byte */
|
|
bytes_read = fread(&gibr->bits, 1, 1, gibr->GeoIPBitFH);
|
|
if (bytes_read == 0) {
|
|
fprintf(stderr, "Warning: EOF reached\n");
|
|
gibr->bits = 0;
|
|
}
|
|
gibr->position = 0;
|
|
}
|
|
bit = ((gibr->bits & (1 << (BITS_IN_BYTE - gibr->position - 1))) > 0) ? 1 : 0;
|
|
bit <<= i;
|
|
num += bit;
|
|
++(gibr->position);
|
|
}
|
|
return num;
|
|
}
|