mongodb: hex.h Source File

00001 // util/hex.h
00002 
00003 /*    Copyright 2009 10gen Inc.
00004  *
00005  *    Licensed under the Apache License, Version 2.0 (the "License");
00006  *    you may not use this file except in compliance with the License.
00007  *    You may obtain a copy of the License at
00008  *
00009  *    http://www.apache.org/licenses/LICENSE-2.0
00010  *
00011  *    Unless required by applicable law or agreed to in writing, software
00012  *    distributed under the License is distributed on an "AS IS" BASIS,
00013  *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00014  *    See the License for the specific language governing permissions and
00015  *    limitations under the License.
00016  */
00017 
00018 #pragma once
00019 
00020 namespace mongo {
00021     //can't use hex namespace because it conflicts with hex iostream function
00022     inline int fromHex( char c ) {
00023         if ( '0' <= c && c <= '9' )
00024             return c - '0';
00025         if ( 'a' <= c && c <= 'f' )
00026             return c - 'a' + 10;
00027         if ( 'A' <= c && c <= 'F' )
00028             return c - 'A' + 10;
00029         assert( false );
00030         return 0xff;
00031     }
00032     inline char fromHex( const char *c ) {
00033         return (char)(( fromHex( c[ 0 ] ) << 4 ) | fromHex( c[ 1 ] ));
00034     }
00035 
00036     inline string toHex(const void* inRaw, int len) {
00037         static const char hexchars[] = "0123456789ABCDEF";
00038 
00039         StringBuilder out;
00040         const char* in = reinterpret_cast<const char*>(inRaw);
00041         for (int i=0; i<len; ++i) {
00042             char c = in[i];
00043             char hi = hexchars[(c & 0xF0) >> 4];
00044             char lo = hexchars[(c & 0x0F)];
00045 
00046             out << hi << lo;
00047         }
00048 
00049         return out.str();
00050     }
00051 
00052     inline string toHexLower(const void* inRaw, int len) {
00053         static const char hexchars[] = "0123456789abcdef";
00054 
00055         StringBuilder out;
00056         const char* in = reinterpret_cast<const char*>(inRaw);
00057         for (int i=0; i<len; ++i) {
00058             char c = in[i];
00059             char hi = hexchars[(c & 0xF0) >> 4];
00060             char lo = hexchars[(c & 0x0F)];
00061 
00062             out << hi << lo;
00063         }
00064 
00065         return out.str();
00066     }
00067 }