/// <summary>
/// Handles META tags that set page encoding
/// </summary>
/// <param name="oP">HTML parser object that is used for parsing</param>
/// <param name="oChunk">Parsed chunk that should contain tag META</param>
/// <param name="bEncodingSet">Your own flag that shows whether encoding was already set or not, if set
/// once then it should not be changed - this is the logic applied by major browsers</param>
/// <returns>True if this was META tag setting Encoding, false otherwise</returns>
public static bool HandleMetaEncoding(HTMLparser oP, HTMLchunk oChunk, ref bool bEncodingSet)
{
if (oChunk.sTag.Length != 4 || oChunk.sTag[0] != 'm' || oChunk.sTag != "meta")
{
return(false);
}
// if we do not use hashmode already then we call conversion explicitly
// this is slow, but METAs are very rare so performance penalty is low
if (!oChunk.bHashMode)
{
oChunk.ConvertParamsToHash();
}
string sKey = oChunk.oParams["http-equiv"] as string;
if (sKey != null)
{
// FIXIT: even though this is happening rare I really don't like lower casing stuff
// that most likely would not need to be - if you feel bored then rewrite this bit
// to make it faster, it is really easy...
switch (sKey.ToLower())
{
case "content-type":
// rare case (appears to work in IE) reported to exist in some pages by Martin B�chtold
case "content-category":
// we might have charset here that may hint at necessity to decode page
// check for possible encoding change
// once encoding is set it should not be changed, but you can be damn
// sure there are web pages out there that do that!!!
if (!bEncodingSet)
{
string sData = oChunk.oParams["content"] as string;
// it is possible we have broken META tag without Content part
if (sData != null)
{
if (oP.SetEncoding(sData))
{
// we may need to re-encode title
if (!bEncodingSet)
{
// here you need to reencode any text that you found so far
// most likely it will be just TITLE, the rest can be ignored anyway
bEncodingSet = true;
}
}
else
{
// failed to set encoding - most likely encoding string
// was incorrect or your machine lacks codepages or something
// else - might be good idea to put warning message here
}
}
}
return(true);
default:
break;
}
}
return(false);
}
/// <summary>
/// Handles META tags that set page encoding
/// </summary>
/// <param name="oP">HTML parser object that is used for parsing</param>
/// <param name="oChunk">Parsed chunk that should contain tag META</param>
/// <param name="bEncodingSet">Your own flag that shows whether encoding was already set or not, if set
/// once then it should not be changed - this is the logic applied by major browsers</param>
/// <returns>True if this was META tag setting Encoding, false otherwise</returns>
public static bool HandleMetaEncoding(HTMLparser oP,HTMLchunk oChunk,ref bool bEncodingSet)
{
if(oChunk.sTag.Length!=4 || oChunk.sTag[0]!='m' || oChunk.sTag!="meta")
return false;
// if we do not use hashmode already then we call conversion explicitly
// this is slow, but METAs are very rare so performance penalty is low
if(!oChunk.bHashMode)
oChunk.ConvertParamsToHash();
string sKey=oChunk.oParams["http-equiv"] as string;
if(sKey!=null)
{
// FIXIT: even though this is happening rare I really don't like lower casing stuff
// that most likely would not need to be - if you feel bored then rewrite this bit
// to make it faster, it is really easy...
switch(sKey.ToLower())
{
case "content-type":
// rare case (appears to work in IE) reported to exist in some pages by Martin B�chtold
case "content-category":
// we might have charset here that may hint at necessity to decode page
// check for possible encoding change
// once encoding is set it should not be changed, but you can be damn
// sure there are web pages out there that do that!!!
if(!bEncodingSet)
{
string sData=oChunk.oParams["content"] as string;
// it is possible we have broken META tag without Content part
if(sData!=null)
{
if(oP.SetEncoding(sData))
{
// we may need to re-encode title
if(!bEncodingSet)
{
// here you need to reencode any text that you found so far
// most likely it will be just TITLE, the rest can be ignored anyway
bEncodingSet=true;
}
}
else
{
// failed to set encoding - most likely encoding string
// was incorrect or your machine lacks codepages or something
// else - might be good idea to put warning message here
}
}
}
return true;
default:
break;
};
}
return false;
}
