1 files changed, 92 insertions, 0 deletions
diff --git a/extensions/universalchardet/src/base/nsCharSetProber.cpp b/extensions/universalchardet/src/base/nsCharSetProber.cpp
new file mode 100644
index 000000000..cd15a10c3
--- /dev/null
+++ b/extensions/universalchardet/src/base/nsCharSetProber.cpp
@@ -0,0 +1,92 @@
+/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+ 
+#include "nsCharSetProber.h"
+#include "prmem.h"
+
+//This filter applies to all scripts which do not use English characters
+bool nsCharSetProber::FilterWithoutEnglishLetters(const char* aBuf, uint32_t aLen, char** newBuf, uint32_t& newLen)
+{
+  char *newptr;
+  char *prevPtr, *curPtr;
+  
+  bool meetMSB = false;   
+  newptr = *newBuf = (char*)PR_Malloc(aLen);
+  if (!newptr)
+    return false;
+
+  for (curPtr = prevPtr = (char*)aBuf; curPtr < aBuf+aLen; curPtr++)
+  {
+    if (*curPtr & 0x80)
+    {
+      meetMSB = true;
+    }
+    else if (*curPtr < 'A' || (*curPtr > 'Z' && *curPtr < 'a') || *curPtr > 'z') 
+    {
+      //current char is a symbol, most likely a punctuation. we treat it as segment delimiter
+      if (meetMSB && curPtr > prevPtr) 
+      //this segment contains more than single symbol, and it has upper ASCII, we need to keep it
+      {
+        while (prevPtr < curPtr) *newptr++ = *prevPtr++;  
+        prevPtr++;
+        *newptr++ = ' ';
+        meetMSB = false;
+      }
+      else //ignore current segment. (either because it is just a symbol or just an English word)
+        prevPtr = curPtr+1;
+    }
+  }
+  if (meetMSB && curPtr > prevPtr) 
+    while (prevPtr < curPtr) *newptr++ = *prevPtr++;  
+
+  newLen = newptr - *newBuf;
+
+  return true;
+}
+
+//This filter applies to all scripts which contain both English characters and upper ASCII characters.
+bool nsCharSetProber::FilterWithEnglishLetters(const char* aBuf, uint32_t aLen, char** newBuf, uint32_t& newLen)
+{
+  //do filtering to reduce load to probers
+  char *newptr;
+  char *prevPtr, *curPtr;
+  bool isInTag = false;
+
+  newptr = *newBuf = (char*)PR_Malloc(aLen);
+  if (!newptr)
+    return false;
+
+  for (curPtr = prevPtr = (char*)aBuf; curPtr < aBuf+aLen; curPtr++)
+  {
+    if (*curPtr == '>')
+      isInTag = false;
+    else if (*curPtr == '<')
+      isInTag = true;
+
+    if (!(*curPtr & 0x80) &&
+        (*curPtr < 'A' || (*curPtr > 'Z' && *curPtr < 'a') || *curPtr > 'z') )
+    {
+      if (curPtr > prevPtr && !isInTag) // Current segment contains more than just a symbol 
+                                        // and it is not inside a tag, keep it.
+      {
+        while (prevPtr < curPtr) *newptr++ = *prevPtr++;  
+        prevPtr++;
+        *newptr++ = ' ';
+      }
+      else
+        prevPtr = curPtr+1;
+    }
+  }
+
+  // If the current segment contains more than just a symbol 
+  // and it is not inside a tag then keep it.
+  if (!isInTag)
+    while (prevPtr < curPtr)
+      *newptr++ = *prevPtr++;  
+
+  newLen = newptr - *newBuf;
+
+  return true;
+}