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Ensure that html is valid utf8 and that tags come in correct(ish) order

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Nimetu 2015-04-18 23:23:23 +03:00
parent f3c99aa589
commit 0933ffc9d2
1 changed files with 138 additions and 1 deletions
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139
code/nel/src/gui/group_html_parser.cpp
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@ -117,10 +117,144 @@ namespace NLGUI
}
}
// ***************************************************************************
// http://stackoverflow.com/a/18335183
static std::string correct_non_utf_8(const std::string &str)
{
int i,f_size=str.size();
unsigned char c,c2,c3,c4;
std::string to;
to.reserve(f_size);
for(i=0 ; i<f_size ; i++){
c=(unsigned char)(str[i]);
if(c<32){//control char
if(c==9 || c==10 || c==13){//allow only \t \n \r
to.append(1,c);
}
continue;
}else if(c<127){//normal ASCII
to.append(1,c);
continue;
}else if(c<160){//control char (nothing should be defined here either ASCI, ISO_8859-1 or UTF8, so skipping)
if(c==128){//fix microsoft mess, add euro
to.append(1,226);
to.append(1,130);
to.append(1,172);
}
if(c==133){//fix IBM mess, add NEL = \n\r
to.append(1,10);
to.append(1,13);
}
continue;
}else if(c<192){//invalid for UTF8, converting ASCII
to.append(1,(unsigned char)194);
to.append(1,c);
continue;
}else if(c<194){//invalid for UTF8, converting ASCII
to.append(1,(unsigned char)195);
to.append(1,c-64);
continue;
}else if(c<224 && i+1<f_size){//possibly 2byte UTF8
c2=(unsigned char)(str[i+1]);
if(c2>127 && c2<192){//valid 2byte UTF8
if(c==194 && c2<160){//control char, skipping
;
}else{
to.append(1,c);
to.append(1,c2);
}
i++;
continue;
}
}else if(c<240 && i+2<f_size){//possibly 3byte UTF8
c2=(unsigned char)(str[i+1]);
c3=(unsigned char)(str[i+2]);
if(c2>127 && c2<192 && c3>127 && c3<192){//valid 3byte UTF8
to.append(1,c);
to.append(1,c2);
to.append(1,c3);
i+=2;
continue;
}
}else if(c<245 && i+3<f_size){//possibly 4byte UTF8
c2=(unsigned char)(str[i+1]);
c3=(unsigned char)(str[i+2]);
c4=(unsigned char)(str[i+3]);
if(c2>127 && c2<192 && c3>127 && c3<192 && c4>127 && c4<192){//valid 4byte UTF8
to.append(1,c);
to.append(1,c2);
to.append(1,c3);
to.append(1,c4);
i+=3;
continue;
}
}
//invalid UTF8, converting ASCII (c>245 || string too short for multi-byte))
to.append(1,(unsigned char)195);
to.append(1,c-64);
}
return to;
}
// ***************************************************************************
static void patchHtmlQuirks(std::string &htmlString)
{
size_t npos = std::string::npos;
size_t pos;
// get rid of BOM (some ingame help files does not show up otherwise)
if (htmlString.substr(0, 3) == "\xEF\xBB\xBF")
{
htmlString.erase(0, 3);
}
// if any element is before <html>, then parser adds <html><body>
// and original tags are ignored (their attributes not processed)
//
// only fix situation when there is <body> tag with attributes
//
// tags are considered to be lowercase
pos = htmlString.find("<body ");
if (pos != npos)
{
size_t start = htmlString.find("<");
// skip <!doctype html>
if (htmlString.substr(start, 2) == "<!")
start = htmlString.find("<", start + 1);
// if there is no html tag, then abort
size_t end = htmlString.find("<html>");
if (end != npos && start < end && end < pos)
{
// body tag end position
size_t insert = htmlString.find(">", pos);
if (insert != npos)
{
std::string str = htmlString.substr(start, end - start);
htmlString.insert(insert+1, str);
htmlString.erase(start, str.size());
}
}
}
// make sure </html> (if present) is last in document or tags coming after it are ignored
pos = htmlString.find("</html>");
if (pos != npos && htmlString.find("<", pos+1) > pos)
{
htmlString.erase(pos, 7);
htmlString += "</html>";
}
// if there is invalid utf-8 chars, then libxml will break everything after first it finds.
htmlString = correct_non_utf_8(htmlString);
}
// ***************************************************************************
bool CGroupHTML::parseHtml(std::string htmlString)
{
htmlParserCtxtPtr parser = htmlCreatePushParserCtxt(NULL, NULL, NULL, 0, NULL, XML_CHAR_ENCODING_NONE);
htmlParserCtxtPtr parser = htmlCreatePushParserCtxt(NULL, NULL, NULL, 0, NULL, XML_CHAR_ENCODING_UTF8);
if (!parser)
{
nlwarning("Creating html parser context failed");
@ -129,6 +263,9 @@ namespace NLGUI
htmlCtxtUseOptions(parser, HTML_PARSE_NOBLANKS | HTML_PARSE_NOERROR | HTML_PARSE_NOWARNING | HTML_PARSE_NONET);
// parser is little strict on tag order, so fix whats needed
patchHtmlQuirks(htmlString);
htmlParseChunk(parser, htmlString.c_str(), htmlString.size(), 0);
htmlParseChunk(parser, "", 0, 1);