From d7fed5a555f51008db8b96e8b978c3830c59be77 Mon Sep 17 00:00:00 2001
From: jgf <jgf>
Date: Thu, 18 Dec 2003 02:43:07 +0000
Subject: decoding of imap folder names

---
(limited to 'noncore')

diff --git a/noncore/net/mail/defines.h b/noncore/net/mail/defines.h
index 9036658..d9cdab0 100644
--- a/noncore/net/mail/defines.h
+++ b/noncore/net/mail/defines.h
@@ -37,4 +37,15 @@
 #define NNTP_PORT           "119"
 #define NNTP_SSL_PORT       "563"
 
+/* used for decoding imapfoldername */
+#define UNDEFINED 64
+#define MAXLINE  76
+#define UTF16MASK       0x03FFUL
+#define UTF16SHIFT      10
+#define UTF16BASE       0x10000UL
+#define UTF16HIGHSTART  0xD800UL
+#define UTF16HIGHEND    0xDBFFUL
+#define UTF16LOSTART    0xDC00UL
+#define UTF16LOEND      0xDFFFUL
+
 #endif
diff --git a/noncore/net/mail/libmailwrapper/mailwrapper.cpp b/noncore/net/mail/libmailwrapper/mailwrapper.cpp
index 858283f..75c06f9 100644
--- a/noncore/net/mail/libmailwrapper/mailwrapper.cpp
+++ b/noncore/net/mail/libmailwrapper/mailwrapper.cpp
@@ -21,20 +21,6 @@ Folder::Folder(const QString&tmp_name, const QString&sep  )
 {
     name = tmp_name;
     nameDisplay = name;
-
-    for ( int pos = nameDisplay.find( '&' ); pos != -1;
-          pos = nameDisplay.find( '&' ) ) {
-        int end = nameDisplay.find( '-' );
-        if ( end == -1 || end <= pos ) break;
-        QString str64 = nameDisplay.mid( pos + 1, end - pos - 1 );
-        // TODO: do real base64 decoding here !
-        if ( str64.compare( "APw" ) == 0 ) {
-            nameDisplay = nameDisplay.replace( pos, end - pos + 1, "ue" );
-        } else if ( str64.compare( "APY" ) == 0 ) {
-            nameDisplay = nameDisplay.replace( pos, end - pos + 1, "oe" );
-        }
-    }
-    qDebug( "folder " + name + " - displayed as " + nameDisplay );
     separator = sep;
 }
 
@@ -46,6 +32,10 @@ const QString& Folder::Separator()const
 IMAPFolder::IMAPFolder(const QString&name,const QString&sep, bool select,const QString&prefix )
     : Folder( name,sep ),m_MaySelect(select)
 {
+  // Decode IMAP foldername
+  nameDisplay = IMAPFolder::decodeFolderName( name );
+  qDebug( "folder " + name + " - displayed as " + nameDisplay );
+
     if (prefix.length()>0) {
         if (nameDisplay.startsWith(prefix) && nameDisplay.length()>prefix.length()) {
             nameDisplay=nameDisplay.right(nameDisplay.length()-prefix.length());
@@ -53,6 +43,95 @@ IMAPFolder::IMAPFolder(const QString&name,const QString&sep, bool select,const Q
     }
 }
 
+static unsigned char base64chars[] =
+  "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+,";
+
+/**
+ * Decodes base64 encoded parts of the imapfolder name
+ * Code taken from kde cvs: kdebase/kioslave/imap4/rfcdecoder.cc
+ */
+QString IMAPFolder::decodeFolderName( const QString &name )
+{
+  unsigned char c, i, bitcount;
+  unsigned long ucs4, utf16, bitbuf;
+  unsigned char base64[256], utf8[6];
+  unsigned long srcPtr = 0;
+  QCString dst;
+  QCString src = name.ascii();
+
+  /* initialize modified base64 decoding table */
+  memset(base64, UNDEFINED, sizeof(base64));
+  for (i = 0; i < sizeof(base64chars); ++i) {
+    base64[(int)base64chars[i]] = i;
+  }
+
+  /* loop until end of string */
+  while (srcPtr < src.length ()) {
+    c = src[srcPtr++];
+    /* deal with literal characters and &- */
+    if (c != '&' || src[srcPtr] == '-') {
+      /* encode literally */
+      dst += c;
+      /* skip over the '-' if this is an &- sequence */
+      if (c == '&')
+        srcPtr++;
+    } else {
+      /* convert modified UTF-7 -> UTF-16 -> UCS-4 -> UTF-8 -> HEX */
+      bitbuf = 0;
+      bitcount = 0;
+      ucs4 = 0;
+      while ((c = base64[(unsigned char) src[srcPtr]]) != UNDEFINED) {
+        ++srcPtr;
+        bitbuf = (bitbuf << 6) | c;
+        bitcount += 6;
+        /* enough bits for a UTF-16 character? */
+        if (bitcount >= 16) {
+          bitcount -= 16;
+          utf16 = (bitcount ? bitbuf >> bitcount : bitbuf) & 0xffff;
+          /* convert UTF16 to UCS4 */
+          if (utf16 >= UTF16HIGHSTART && utf16 <= UTF16HIGHEND) {
+            ucs4 = (utf16 - UTF16HIGHSTART) << UTF16SHIFT;
+            continue;
+          } else if (utf16 >= UTF16LOSTART && utf16 <= UTF16LOEND) {
+            ucs4 += utf16 - UTF16LOSTART + UTF16BASE;
+          } else {
+            ucs4 = utf16;
+          }
+          /* convert UTF-16 range of UCS4 to UTF-8 */
+          if (ucs4 <= 0x7fUL) {
+            utf8[0] = ucs4;
+            i = 1;
+          } else if (ucs4 <= 0x7ffUL) {
+            utf8[0] = 0xc0 | (ucs4 >> 6);
+            utf8[1] = 0x80 | (ucs4 & 0x3f);
+            i = 2;
+          } else if (ucs4 <= 0xffffUL) {
+            utf8[0] = 0xe0 | (ucs4 >> 12);
+            utf8[1] = 0x80 | ((ucs4 >> 6) & 0x3f);
+            utf8[2] = 0x80 | (ucs4 & 0x3f);
+            i = 3;
+          } else {
+            utf8[0] = 0xf0 | (ucs4 >> 18);
+            utf8[1] = 0x80 | ((ucs4 >> 12) & 0x3f);
+            utf8[2] = 0x80 | ((ucs4 >> 6) & 0x3f);
+            utf8[3] = 0x80 | (ucs4 & 0x3f);
+            i = 4;
+          }
+          /* copy it */
+          for (c = 0; c < i; ++c) {
+            dst += utf8[c];
+          }
+        }
+      }
+      /* skip over trailing '-' in modified UTF-7 encoding */
+      if (src[srcPtr] == '-')
+        ++srcPtr;
+    }
+  }
+
+  return QString::fromUtf8( dst.data() );
+}
+
 MailWrapper::MailWrapper( Settings *s )
     : QObject()
 {
diff --git a/noncore/net/mail/libmailwrapper/mailwrapper.h b/noncore/net/mail/libmailwrapper/mailwrapper.h
index d78f8e9..02fe4b7 100644
--- a/noncore/net/mail/libmailwrapper/mailwrapper.h
+++ b/noncore/net/mail/libmailwrapper/mailwrapper.h
@@ -88,7 +88,9 @@ class IMAPFolder : public Folder
         IMAPFolder(const QString&name, const QString&sep, bool select=true,const QString&prefix="" );
         virtual bool may_select()const{return m_MaySelect;}
     private:
+		static QString decodeFolderName( const QString &name );
         bool m_MaySelect;
+
 };
 
 class MailWrapper : public QObject
diff --git a/noncore/net/mail/mailwrapper.cpp b/noncore/net/mail/mailwrapper.cpp
index 858283f..75c06f9 100644
--- a/noncore/net/mail/mailwrapper.cpp
+++ b/noncore/net/mail/mailwrapper.cpp
@@ -21,20 +21,6 @@ Folder::Folder(const QString&tmp_name, const QString&sep  )
 {
     name = tmp_name;
     nameDisplay = name;
-
-    for ( int pos = nameDisplay.find( '&' ); pos != -1;
-          pos = nameDisplay.find( '&' ) ) {
-        int end = nameDisplay.find( '-' );
-        if ( end == -1 || end <= pos ) break;
-        QString str64 = nameDisplay.mid( pos + 1, end - pos - 1 );
-        // TODO: do real base64 decoding here !
-        if ( str64.compare( "APw" ) == 0 ) {
-            nameDisplay = nameDisplay.replace( pos, end - pos + 1, "ue" );
-        } else if ( str64.compare( "APY" ) == 0 ) {
-            nameDisplay = nameDisplay.replace( pos, end - pos + 1, "oe" );
-        }
-    }
-    qDebug( "folder " + name + " - displayed as " + nameDisplay );
     separator = sep;
 }
 
@@ -46,6 +32,10 @@ const QString& Folder::Separator()const
 IMAPFolder::IMAPFolder(const QString&name,const QString&sep, bool select,const QString&prefix )
     : Folder( name,sep ),m_MaySelect(select)
 {
+  // Decode IMAP foldername
+  nameDisplay = IMAPFolder::decodeFolderName( name );
+  qDebug( "folder " + name + " - displayed as " + nameDisplay );
+
     if (prefix.length()>0) {
         if (nameDisplay.startsWith(prefix) && nameDisplay.length()>prefix.length()) {
             nameDisplay=nameDisplay.right(nameDisplay.length()-prefix.length());
@@ -53,6 +43,95 @@ IMAPFolder::IMAPFolder(const QString&name,const QString&sep, bool select,const Q
     }
 }
 
+static unsigned char base64chars[] =
+  "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+,";
+
+/**
+ * Decodes base64 encoded parts of the imapfolder name
+ * Code taken from kde cvs: kdebase/kioslave/imap4/rfcdecoder.cc
+ */
+QString IMAPFolder::decodeFolderName( const QString &name )
+{
+  unsigned char c, i, bitcount;
+  unsigned long ucs4, utf16, bitbuf;
+  unsigned char base64[256], utf8[6];
+  unsigned long srcPtr = 0;
+  QCString dst;
+  QCString src = name.ascii();
+
+  /* initialize modified base64 decoding table */
+  memset(base64, UNDEFINED, sizeof(base64));
+  for (i = 0; i < sizeof(base64chars); ++i) {
+    base64[(int)base64chars[i]] = i;
+  }
+
+  /* loop until end of string */
+  while (srcPtr < src.length ()) {
+    c = src[srcPtr++];
+    /* deal with literal characters and &- */
+    if (c != '&' || src[srcPtr] == '-') {
+      /* encode literally */
+      dst += c;
+      /* skip over the '-' if this is an &- sequence */
+      if (c == '&')
+        srcPtr++;
+    } else {
+      /* convert modified UTF-7 -> UTF-16 -> UCS-4 -> UTF-8 -> HEX */
+      bitbuf = 0;
+      bitcount = 0;
+      ucs4 = 0;
+      while ((c = base64[(unsigned char) src[srcPtr]]) != UNDEFINED) {
+        ++srcPtr;
+        bitbuf = (bitbuf << 6) | c;
+        bitcount += 6;
+        /* enough bits for a UTF-16 character? */
+        if (bitcount >= 16) {
+          bitcount -= 16;
+          utf16 = (bitcount ? bitbuf >> bitcount : bitbuf) & 0xffff;
+          /* convert UTF16 to UCS4 */
+          if (utf16 >= UTF16HIGHSTART && utf16 <= UTF16HIGHEND) {
+            ucs4 = (utf16 - UTF16HIGHSTART) << UTF16SHIFT;
+            continue;
+          } else if (utf16 >= UTF16LOSTART && utf16 <= UTF16LOEND) {
+            ucs4 += utf16 - UTF16LOSTART + UTF16BASE;
+          } else {
+            ucs4 = utf16;
+          }
+          /* convert UTF-16 range of UCS4 to UTF-8 */
+          if (ucs4 <= 0x7fUL) {
+            utf8[0] = ucs4;
+            i = 1;
+          } else if (ucs4 <= 0x7ffUL) {
+            utf8[0] = 0xc0 | (ucs4 >> 6);
+            utf8[1] = 0x80 | (ucs4 & 0x3f);
+            i = 2;
+          } else if (ucs4 <= 0xffffUL) {
+            utf8[0] = 0xe0 | (ucs4 >> 12);
+            utf8[1] = 0x80 | ((ucs4 >> 6) & 0x3f);
+            utf8[2] = 0x80 | (ucs4 & 0x3f);
+            i = 3;
+          } else {
+            utf8[0] = 0xf0 | (ucs4 >> 18);
+            utf8[1] = 0x80 | ((ucs4 >> 12) & 0x3f);
+            utf8[2] = 0x80 | ((ucs4 >> 6) & 0x3f);
+            utf8[3] = 0x80 | (ucs4 & 0x3f);
+            i = 4;
+          }
+          /* copy it */
+          for (c = 0; c < i; ++c) {
+            dst += utf8[c];
+          }
+        }
+      }
+      /* skip over trailing '-' in modified UTF-7 encoding */
+      if (src[srcPtr] == '-')
+        ++srcPtr;
+    }
+  }
+
+  return QString::fromUtf8( dst.data() );
+}
+
 MailWrapper::MailWrapper( Settings *s )
     : QObject()
 {
diff --git a/noncore/net/mail/mailwrapper.h b/noncore/net/mail/mailwrapper.h
index d78f8e9..02fe4b7 100644
--- a/noncore/net/mail/mailwrapper.h
+++ b/noncore/net/mail/mailwrapper.h
@@ -88,7 +88,9 @@ class IMAPFolder : public Folder
         IMAPFolder(const QString&name, const QString&sep, bool select=true,const QString&prefix="" );
         virtual bool may_select()const{return m_MaySelect;}
     private:
+		static QString decodeFolderName( const QString &name );
         bool m_MaySelect;
+
 };
 
 class MailWrapper : public QObject
--
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