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#define XNetlib_GetBase64DecodedBufferSize(cchEncoded) (((cchEncoded)>>2)*3)
#define XNetlib_GetBase64EncodedBufferSize(cbDecoded) (((cbDecoded)*4+11)/12*4+1)
static char base64chars[]="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
int XNetlibBase64Encode(WPARAM wParam,LPARAM lParam)
{
NETLIBBASE64 *nlb64=(NETLIBBASE64*)lParam;
int iIn;
char *pszOut;
PBYTE pbIn;
if(nlb64==NULL || nlb64->pszEncoded==NULL || nlb64->pbDecoded==NULL) {
SetLastError(ERROR_INVALID_PARAMETER);
return 0;
}
if(nlb64->cchEncoded<XNetlib_GetBase64EncodedBufferSize(nlb64->cbDecoded)) {
SetLastError(ERROR_BUFFER_OVERFLOW);
return 0;
}
nlb64->cchEncoded=XNetlib_GetBase64EncodedBufferSize(nlb64->cbDecoded);
for(iIn=0,pbIn=nlb64->pbDecoded,pszOut=nlb64->pszEncoded;iIn<nlb64->cbDecoded;iIn+=3,pbIn+=3,pszOut+=4) {
pszOut[0]=base64chars[pbIn[0]>>2];
if(nlb64->cbDecoded-iIn==1) {
pszOut[1]=base64chars[(pbIn[0]&3)<<4];
pszOut[2]='=';
pszOut[3]='=';
pszOut+=4;
break;
}
pszOut[1]=base64chars[((pbIn[0]&3)<<4)|(pbIn[1]>>4)];
if(nlb64->cbDecoded-iIn==2) {
pszOut[2]=base64chars[(pbIn[1]&0xF)<<2];
pszOut[3]='=';
pszOut+=4;
break;
}
pszOut[2]=base64chars[((pbIn[1]&0xF)<<2)|(pbIn[2]>>6)];
pszOut[3]=base64chars[pbIn[2]&0x3F];
}
pszOut[0]='\0';
return 1;
}
BYTE Base64CharToInt(char c)
{
if(c>='A' && c<='Z') return c-'A';
if(c>='a' && c<='z') return c-'a'+26;
if(c>='0' && c<='9') return c-'0'+52;
if(c=='+') return 62;
if(c=='/') return 63;
if(c=='=') return 64;
return 255;
}
int XNetlibBase64Decode(WPARAM wParam,LPARAM lParam)
{
NETLIBBASE64 *nlb64=(NETLIBBASE64*)lParam;
char *pszIn;
PBYTE pbOut;
BYTE b1,b2,b3,b4;
int iIn;
if(nlb64==NULL || nlb64->pszEncoded==NULL || nlb64->pbDecoded==NULL) {
SetLastError(ERROR_INVALID_PARAMETER);
return 0;
}
if(nlb64->cchEncoded&3) {
SetLastError(ERROR_INVALID_DATA);
return 0;
}
if(nlb64->cbDecoded<XNetlib_GetBase64DecodedBufferSize(nlb64->cchEncoded)) {
SetLastError(ERROR_BUFFER_OVERFLOW);
return 0;
}
nlb64->cbDecoded=XNetlib_GetBase64DecodedBufferSize(nlb64->cchEncoded);
for(iIn=0,pszIn=nlb64->pszEncoded,pbOut=nlb64->pbDecoded;iIn<nlb64->cchEncoded;iIn+=4,pszIn+=4,pbOut+=3) {
b1=Base64CharToInt(pszIn[0]);
b2=Base64CharToInt(pszIn[1]);
b3=Base64CharToInt(pszIn[2]);
b4=Base64CharToInt(pszIn[3]);
if(b1==255 || b1==64 || b2==255 || b2==64 || b3==255 || b4==255) {
SetLastError(ERROR_INVALID_DATA);
return 0;
}
pbOut[0]=(b1<<2)|(b2>>4);
if(b3==64) {nlb64->cbDecoded-=2; break;}
pbOut[1]=(b2<<4)|(b3>>2);
if(b4==64) {nlb64->cbDecoded--; break;}
pbOut[2]=b4|(b3<<6);
}
return 1;
}
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