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Ensure that html is valid utf8 and that tags come in correct(ish) order
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Nimetu
parent
f3c99aa589
commit
0933ffc9d2
1 changed files with 138 additions and 1 deletions
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@ -117,10 +117,144 @@ namespace NLGUI
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}
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}
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// ***************************************************************************
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// http://stackoverflow.com/a/18335183
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static std::string correct_non_utf_8(const std::string &str)
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{
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int i,f_size=str.size();
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unsigned char c,c2,c3,c4;
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std::string to;
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to.reserve(f_size);
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for(i=0 ; i<f_size ; i++){
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c=(unsigned char)(str[i]);
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if(c<32){//control char
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if(c==9 || c==10 || c==13){//allow only \t \n \r
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to.append(1,c);
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}
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continue;
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}else if(c<127){//normal ASCII
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to.append(1,c);
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continue;
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}else if(c<160){//control char (nothing should be defined here either ASCI, ISO_8859-1 or UTF8, so skipping)
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if(c==128){//fix microsoft mess, add euro
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to.append(1,226);
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to.append(1,130);
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to.append(1,172);
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}
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if(c==133){//fix IBM mess, add NEL = \n\r
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to.append(1,10);
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to.append(1,13);
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}
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continue;
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}else if(c<192){//invalid for UTF8, converting ASCII
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to.append(1,(unsigned char)194);
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to.append(1,c);
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continue;
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}else if(c<194){//invalid for UTF8, converting ASCII
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to.append(1,(unsigned char)195);
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to.append(1,c-64);
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continue;
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}else if(c<224 && i+1<f_size){//possibly 2byte UTF8
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c2=(unsigned char)(str[i+1]);
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if(c2>127 && c2<192){//valid 2byte UTF8
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if(c==194 && c2<160){//control char, skipping
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;
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}else{
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to.append(1,c);
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to.append(1,c2);
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}
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i++;
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continue;
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}
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}else if(c<240 && i+2<f_size){//possibly 3byte UTF8
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c2=(unsigned char)(str[i+1]);
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c3=(unsigned char)(str[i+2]);
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if(c2>127 && c2<192 && c3>127 && c3<192){//valid 3byte UTF8
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to.append(1,c);
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to.append(1,c2);
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to.append(1,c3);
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i+=2;
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continue;
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}
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}else if(c<245 && i+3<f_size){//possibly 4byte UTF8
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c2=(unsigned char)(str[i+1]);
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c3=(unsigned char)(str[i+2]);
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c4=(unsigned char)(str[i+3]);
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if(c2>127 && c2<192 && c3>127 && c3<192 && c4>127 && c4<192){//valid 4byte UTF8
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to.append(1,c);
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to.append(1,c2);
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to.append(1,c3);
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to.append(1,c4);
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i+=3;
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continue;
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}
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}
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//invalid UTF8, converting ASCII (c>245 || string too short for multi-byte))
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to.append(1,(unsigned char)195);
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to.append(1,c-64);
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}
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return to;
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}
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// ***************************************************************************
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static void patchHtmlQuirks(std::string &htmlString)
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{
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size_t npos = std::string::npos;
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size_t pos;
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// get rid of BOM (some ingame help files does not show up otherwise)
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if (htmlString.substr(0, 3) == "\xEF\xBB\xBF")
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{
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htmlString.erase(0, 3);
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}
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// if any element is before <html>, then parser adds <html><body>
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// and original tags are ignored (their attributes not processed)
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//
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// only fix situation when there is <body> tag with attributes
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//
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// tags are considered to be lowercase
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pos = htmlString.find("<body ");
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if (pos != npos)
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{
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size_t start = htmlString.find("<");
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// skip <!doctype html>
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if (htmlString.substr(start, 2) == "<!")
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start = htmlString.find("<", start + 1);
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// if there is no html tag, then abort
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size_t end = htmlString.find("<html>");
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if (end != npos && start < end && end < pos)
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{
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// body tag end position
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size_t insert = htmlString.find(">", pos);
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if (insert != npos)
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{
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std::string str = htmlString.substr(start, end - start);
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htmlString.insert(insert+1, str);
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htmlString.erase(start, str.size());
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}
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}
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}
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// make sure </html> (if present) is last in document or tags coming after it are ignored
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pos = htmlString.find("</html>");
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if (pos != npos && htmlString.find("<", pos+1) > pos)
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{
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htmlString.erase(pos, 7);
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htmlString += "</html>";
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}
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// if there is invalid utf-8 chars, then libxml will break everything after first it finds.
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htmlString = correct_non_utf_8(htmlString);
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}
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// ***************************************************************************
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bool CGroupHTML::parseHtml(std::string htmlString)
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{
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htmlParserCtxtPtr parser = htmlCreatePushParserCtxt(NULL, NULL, NULL, 0, NULL, XML_CHAR_ENCODING_NONE);
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htmlParserCtxtPtr parser = htmlCreatePushParserCtxt(NULL, NULL, NULL, 0, NULL, XML_CHAR_ENCODING_UTF8);
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if (!parser)
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{
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nlwarning("Creating html parser context failed");
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@ -129,6 +263,9 @@ namespace NLGUI
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htmlCtxtUseOptions(parser, HTML_PARSE_NOBLANKS | HTML_PARSE_NOERROR | HTML_PARSE_NOWARNING | HTML_PARSE_NONET);
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// parser is little strict on tag order, so fix whats needed
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patchHtmlQuirks(htmlString);
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htmlParseChunk(parser, htmlString.c_str(), htmlString.size(), 0);
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htmlParseChunk(parser, "", 0, 1);
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