1 files changed, 93 insertions, 0 deletions
diff --git a/plugins/FileAsMessage/base64.c b/plugins/FileAsMessage/base64.c
new file mode 100644
index 0000000000..220cd85027
--- /dev/null
+++ b/plugins/FileAsMessage/base64.c
@@ -0,0 +1,93 @@
+#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;
+}