perfs: avoid using int div (%) for wrapping buffers

src/bincimapmime/mime-parsefull.cc

@@ -339,8 +339,10 @@ static bool skipUntilBoundary(const string &delimiter,
     if (!delimiterqueue)
       continue;
 
-    delimiterqueue[delimiterpos++ % endpos] = c;
-
+    delimiterqueue[delimiterpos++] = c;
+    if (delimiterpos ==  endpos)
+      delimiterpos = 0;
+      
     if (compareStringToQueue(delimiterStr, delimiterqueue,
 			     delimiterpos, endpos)) {
       foundBoundary = true;
@@ -535,7 +537,6 @@ static void parseSinglePart(const string &toboundary,
     boundaryqueue = new char[endpos];
     memset(boundaryqueue, 0, endpos);
   }
-  int boundarypos = 0;
 
   *boundarysize = 0;
 
@@ -543,6 +544,7 @@ static void parseSinglePart(const string &toboundary,
   string line;
   bool toboundaryIsEmpty = (toboundary == "");
   char c;
+  int boundarypos = 0;
   while (mimeSource->getChar(&c)) {
     if (c == '\n') { ++*nbodylines; ++*nlines; }
 
@@ -550,7 +552,9 @@ static void parseSinglePart(const string &toboundary,
       continue;
 
     // find boundary
-    boundaryqueue[boundarypos++ % endpos] = c;
+    boundaryqueue[boundarypos++] = c;
+    if (boundarypos == endpos)
+      boundarypos = 0;
       
     if (compareStringToQueue(_toboundaryStr, boundaryqueue,
 			     boundarypos, endpos)) {

src/bincimapmime/mime-printbody.cc

@@ -93,7 +93,7 @@ void Binc::MimePart::getBody(string &s,
 {
   mimeSource->reset();
   mimeSource->seek(bodystartoffsetcrlf + startoffset);
-
+  s.reserve(length);
   if (startoffset + length > bodylength)
     length = bodylength - startoffset;
 

src/bincimapmime/mime-utils.h

@@ -42,9 +42,12 @@ using namespace ::std;
 inline bool compareStringToQueue(const char *s_in, char *bqueue,
 				 int pos, int size)
 {
-  for (int i = 0; i < size; ++i)
-    if (s_in[i] != bqueue[(pos + i) % size])
+  for (int i = 0; i < size; ++i)  {
+    if (s_in[i] != bqueue[pos])
       return false;
+    if (++pos == size)
+      pos = 0;
+  }
 
   return true;
 }