?? base641.cpp
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/*==========================================================================
ASCII---->base64 source code
powered by shadow
@2004.10.4 01:01
web:http://www.codehome.6600.org
info:
sperated by 6 bits:
-----Base64 code table:
-----0-25--> 'A"-'Z' 26-51-->'a'-'z' 52-61-->'0'-'9' 62-->'+' 63-->'/'
============================================================================*/
#include "stdafx.h"
#include "BASE641.h"
BASE64::BASE64()
{
length = 0;
StrEncode = false;
StrDecode = false;
memset(Base64Str,0,1015);
base64_str=Base64Str;
fp_in=NULL;
fp_out=NULL;
Base64Error[0]="Encode Success!";
Base64Error[1]="String too long!";
Base64Error[2]="Open file failed!";
//MessageBox(NULL,"com","com",MB_OK);
}
BASE64::~BASE64()
{
}
void BASE64::put(unsigned char ch)
{
if(ch>=0&&ch<=25) ch+=65;
else if(ch>=26&&ch<=51) ch+=71;
else if(ch>=52&&ch<=61) ch-=4;
else if(ch==62) ch='+';
else ch='/';
if(fp_out!=NULL)
fputc(ch,fp_out);
//printf("%c",ch);
if(StrEncode) *(base64_str++)=ch;
length++;
if(length%76==0){
length=0;
if(fp_out!=NULL) fputs("\r\n",fp_out);
if(StrEncode){
*(base64_str++)='\r';
*(base64_str++)='\n';
}
}
}
void BASE64::encode_1()
{
int i;
unsigned char ch;
ch=code[0]>>2;
put(ch);
ch=(code[0]<<4)&63;
put(ch);
for(i=0;i<2;i++){
if(fp_out!=NULL) fputc('=',fp_out);
//printf("=");
if(StrEncode) *(base64_str++)='=';
length++;
if(length%76==0){
length=0;
if(fp_out!=NULL) fputs("\r\n",fp_out);
if(StrEncode){
*(base64_str++)='\r';
*(base64_str++)='\n';
}
}
}
}
void BASE64::encode_2()
{
unsigned char ch;
ch=code[0]>>2;
put(ch);
ch=(code[0]<<4|code[1]>>4)&63;
put(ch);
ch=(code[1]<<2)&63;
put(ch);
if(fp_out!=NULL) fputc('=',fp_out);
//printf("=");
if(StrEncode) *(base64_str++)='=';
length++;
if(length%76==0){
length=0;
if(fp_out!=NULL) fputs("\r\n",fp_out);
if(StrEncode){
*(base64_str++)='\r';
*(base64_str++)='\n';
}
}
}
void BASE64::encode_3()
{
unsigned char ch;
ch=code[0]>>2;
put(ch);
ch=(code[0]<<4|code[1]>>4)&63;
put(ch);
ch=(code[1]<<2|code[2]>>6)&63;
put(ch);
ch=code[2]&63;
put(ch);
}
void BASE64::file_encode(FILE *fp)
{
int i=0;
while(!feof(fp)){
code[i]=fgetc(fp);
if(code[i]==255&&feof(fp)) ; /*如果把文件的結尾標志-1讀出來，即無符號就是255，那就不算，如果不是在文件尾就算，主要考慮到exe文件情況*/
else i++;
if(i==3) {encode_3();i=0;}
}
switch(i){
case 1:encode_1();break;
case 2:encode_2();break;
default:break;
}
}
char * BASE64::StringEncode(unsigned char *p)
{
char base64strcopy[1015];
if(strlen((char *)p)>MaxLen){
errorcode=1;
return NULL;
}
int i=0;
StrEncode=true;
if(StrEncode){
while(*p){
code[i]=*p;
i++;
p++;
if(i==3) {encode_3();i=0;}
}
switch(i){
case 1:encode_1();break;
case 2:encode_2();break;
default:break;
}
}
errorcode=0;
memset(base64strcopy,0,1015);
strcpy(base64strcopy,Base64Str);
// MessageBox(NULL,base64strcopy,"strong",MB_OK);
Reset();
return base64strcopy;
}
int BASE64::FileEncode(char *fromfile,char *tofile)
{
fp_in=fopen(fromfile,"rb");
fp_out=fopen(tofile,"wb+");
if(fp_in==NULL||fp_out==NULL){
errorcode=2;
return errorcode;
}
file_encode(fp_in);
errorcode=0;
fclose(fp_in);
fclose(fp_out);
Reset();
return errorcode;
}
char * BASE64::GetLastError()
{
return Base64Error[errorcode];
}
void BASE64::Reset()
{
length=0;
StrEncode=false;
StrDecode=false;
memset(Base64Str,0,1015);
base64_str=Base64Str;
}
//next is base64 decode
void BASE64::decode_2()
{
unsigned char ch;
ch=(decode[1]<<2)|(decode[2]>>4);
if(fp_out!=NULL) fputc(ch,fp_out);
//printf("%c",ch);
if(StrDecode) *(base64_str++)=ch;
}
void BASE64::decode_3()
{
unsigned char ch;
ch=(decode[1]<<2)|(decode[2]>>4);
if(fp_out!=NULL) fputc(ch,fp_out);
//printf("%c",ch);
if(StrDecode) *(base64_str++)=ch;
ch=(decode[2]<<4)|(decode[3]>>2);
if(fp_out!=NULL) fputc(ch,fp_out);
//printf("%c",ch);
if(StrDecode) *(base64_str++)=ch;
}
void BASE64::decode_4()
{
unsigned char ch;
ch=(decode[1]<<2)|(decode[2]>>4);
if(fp_out!=NULL) fputc(ch,fp_out);
//printf("%c",ch);
if(StrDecode) *(base64_str++)=ch;
ch=(decode[2]<<4)|(decode[3]>>2);
if(fp_out!=NULL) fputc(ch,fp_out);
//printf("%c",ch);
if(StrDecode) *(base64_str++)=ch;
ch=(decode[3]<<6)|decode[4];
if(fp_out!=NULL) fputc(ch,fp_out);
//printf("%c",ch);
if(StrDecode) *(base64_str++)=ch;
}
void BASE64::file_decode(FILE *fp)
{
int i=1,j=0;
while(!feof(fp)){
decode[i]=fgetc(fp);
if(decode[i]==255&&feof(fp)) ; /*如果把文件的結尾標志-1讀出來，即無符號就是255，那就不算，如果不是在文件尾就算，主要考慮到exe文件情況*/
else{
if(decode[i]>=65&&decode[i]<=90) {decode[i]-=65;j++;}
else if(decode[i]>=97&&decode[i]<=122) {decode[i]-=71;j++;}
else if(decode[i]>=48&&decode[i]<=57) {decode[i]+=4;j++;}
else if(decode[i]=='+') {decode[i]=62;j++;}
else if(decode[i]=='/') {decode[i]=63;j++;}
else ;
i++;
length++;
if(length%76==0) fseek(fp,2L,1);
}
if(j==4) {decode_4();i=1;j=0;}
}
switch(j){
case 2:decode_2();break;
case 3:decode_3();break;
default:break;
}
}
char * BASE64::StringDecode(unsigned char *p)
{
if(strlen((char *)p)>DeMaxLen){
errorcode=1;
return NULL;
}
int i=1,j=0;
StrDecode=true;
if(StrDecode){
while(*p){
if(*p=='\r'||*p=='\n') continue;
decode[i]=*p;
if(decode[i]>=65&&decode[i]<=90) {decode[i]-=65;j++;}
else if(decode[i]>=97&&decode[i]<=122) {decode[i]-=71;j++;}
else if(decode[i]>=48&&decode[i]<=57) {decode[i]+=4;j++;}
else if(decode[i]=='+') {decode[i]=62;j++;}
else if(decode[i]=='/') {decode[i]=63;j++;}
p++;i++;
if(j==4) {decode_4();i=1;j=0;}
}
switch(j){
case 2:decode_2();break;
case 3:decode_3();break;
default:break;
}
}
errorcode=0;
char debase64str[1015];
strcpy(debase64str,Base64Str);
Reset();
return debase64str;
}
int BASE64::FileDecode(char *fromfile, char *tofile)
{
fp_in=fopen(fromfile,"rb");
fp_out=fopen(tofile,"wb+");
if(fp_in==NULL||fp_out==NULL){
errorcode=2;
return errorcode;
}
file_decode(fp_in);
errorcode=0;
fclose(fp_in);
fclose(fp_out);
Reset();
return errorcode;
}
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