1 files changed, 132 insertions, 0 deletions

diff --git a/src/mime/base64.cc b/src/mime/base64.cc
new file mode 100644
index 0000000..842bbd3
--- /dev/null
+++ b/src/mime/base64.cc
@@ -0,0 +1,132 @@
+/*************************************************************************
+ *
+ * HTCd - Copyright (C) 1998-2006 Henrik Rydberg
+ *
+ * This program 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 program 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 program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include <mime/enc.h>
+
+static unsigned char char2six[256]={
+  65,65,65,65,65,65,65,65,
+  65,65,65,65,65,65,65,65,
+  65,65,65,65,65,65,65,65,
+  65,65,65,65,65,65,65,65,
+  65,65,65,65,65,65,65,65,
+  65,65,65,62,65,65,65,63,
+  52,53,54,55,56,57,58,59,
+  60,61,65,65,65,64,65,65,
+  65, 0, 1, 2, 3, 4, 5, 6,
+   7, 8, 9,10,11,12,13,14,
+  15,16,17,18,19,20,21,22,
+  23,24,25,65,65,65,65,65,
+  65,26,27,28,29,30,31,32,
+  33,34,35,36,37,38,39,40,
+  41,42,43,44,45,46,47,48,
+  49,50,51,65,65,65,65,65,
+  65,65,65,65,65,65,65,65,
+  65,65,65,65,65,65,65,65,
+  65,65,65,65,65,65,65,65,
+  65,65,65,65,65,65,65,65,
+  65,65,65,65,65,65,65,65,
+  65,65,65,65,65,65,65,65,
+  65,65,65,65,65,65,65,65,
+  65,65,65,65,65,65,65,65,
+  65,65,65,65,65,65,65,65,
+  65,65,65,65,65,65,65,65,
+  65,65,65,65,65,65,65,65,
+  65,65,65,65,65,65,65,65,
+  65,65,65,65,65,65,65,65,
+  65,65,65,65,65,65,65,65,
+  65,65,65,65,65,65,65,65,
+  65,65,65,65,65,65,65,65
+};
+static unsigned char six2char[64]={
+  'A','B','C','D','E','F','G','H',
+  'I','J','K','L','M','N','O','P',
+  'Q','R','S','T','U','V','W','X',
+  'Y','Z','a','b','c','d','e','f',
+  'g','h','i','j','k','l','m','n',
+  'o','p','q','r','s','t','u','v',
+  'w','x','y','z','0','1','2','3',
+  '4','5','6','7','8','9','+','/'
+};
+inline void tri2quad(mstream& out,unsigned code,int m=4)
+{
+  char buf[4];
+  buf[3]=six2char[code&63U]; code>>=6;
+  buf[2]=six2char[code&63U]; code>>=6;
+  buf[1]=six2char[code&63U]; code>>=6;
+  buf[0]=six2char[code&63U];
+  out.write(buf,m);
+}
+inline void quad2tri(mstream& out,unsigned code,int m=3)
+{
+  char buf[3];
+  buf[2]=code&255U; code>>=8;
+  buf[1]=code&255U; code>>=8;
+  buf[0]=code&255U;
+  out.write(buf,m);
+}
+
+void encode64(mstream& out,const sref& in)
+{
+  unsigned m=0,code=0,wrap=0;
+  for(const char* p=in.begin();p!=in.end();p++) {
+    code<<=8;
+    code|=(unsigned char)*p;
+    if(++m==3) {
+      tri2quad(out,code);
+      m=0;
+      if(++wrap==15) { out<<CRLF; wrap=0; }
+    }
+  }
+  if(m==1) {
+    code<<=16;
+    tri2quad(out,code,2);
+    out<<"==";
+    if(++wrap==15) { out<<CRLF; wrap=0; }
+  }
+  else if(m==2) {
+    code<<=8;
+    tri2quad(out,code,3);
+    out.put('=');
+    if(++wrap==15) { out<<CRLF; wrap=0; }
+  }
+  if(wrap>0) out<<CRLF;
+}
+
+void decode64(mstream& out,const sref& in)
+{
+  unsigned m=0,code=0,six=0;
+  for(const char* p=in.begin();p!=in.end();p++) {
+    six=char2six[(unsigned char)*p];
+    if(six>=64) continue;
+    code<<=6;
+    code|=six;
+    if(++m==4) {
+      quad2tri(out,code);
+      m=0;
+    }
+  }
+  if(m==2) {
+    code<<=12;
+    quad2tri(out,code,1);
+  }
+  else if(m==3) {
+    code<<=6;
+    quad2tri(out,code,2);
+  }
+}