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svg_loader XMLParser: Refacotring simpleXmlParse method
1. Remove macro function. The existing macro function was doing meaningless nested `return false`. 2. Extract the logic to find the type as a function. 3. The SimpleXMLType::Error case is not actually used, and in case of invalid XML, Do 'return false' immediately.
This commit is contained in:
JunsuChoi
Hermet Park
parent
9c8e785fdc
commit
e5196d610d
1 changed files with 86 additions and 104 deletions
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@ -206,6 +206,35 @@ static const char* _simpleXmlFindDoctypeChildEndTag(const char* itr, const char*
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}
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static SimpleXMLType _getXMLType(const char* itr, const char* itrEnd, size_t &toff)
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{
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toff = 0;
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if (itr[1] == '/') {
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toff = 1;
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return SimpleXMLType::Close;
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} else if (itr[1] == '?') {
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toff = 1;
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return SimpleXMLType::Processing;
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} else if (itr[1] == '!') {
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if ((itr + sizeof("<!DOCTYPE>") - 1 < itrEnd) && (!memcmp(itr + 2, "DOCTYPE", sizeof("DOCTYPE") - 1)) && ((itr[2 + sizeof("DOCTYPE") - 1] == '>') || (isspace((unsigned char)itr[2 + sizeof("DOCTYPE") - 1])))) {
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toff = sizeof("!DOCTYPE") - 1;
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return SimpleXMLType::Doctype;
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} else if (itr + sizeof("<!>") - 1 < itrEnd) {
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toff = sizeof("!") - 1;
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return SimpleXMLType::DoctypeChild;
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} else if ((itr + sizeof("<![CDATA[]]>") - 1 < itrEnd) && (!memcmp(itr + 2, "[CDATA[", sizeof("[CDATA[") - 1))) {
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toff = sizeof("![CDATA[") - 1;
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return SimpleXMLType::CData;
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} else if ((itr + sizeof("<!---->") - 1 < itrEnd) && (!memcmp(itr + 2, "--", sizeof("--") - 1))) {
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toff = sizeof("!--") - 1;
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return SimpleXMLType::Comment;
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}
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return SimpleXMLType::Open;
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}
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return SimpleXMLType::Open;
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}
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/************************************************************************/
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/* External Class Implementation */
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/************************************************************************/
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@ -333,107 +362,63 @@ bool simpleXmlParse(const char* buf, unsigned bufLength, bool strip, simpleXMLCb
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if (!buf || !func) return false;
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#define CB(type, start, end) \
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do { \
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size_t _sz = end - start; \
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bool _ret; \
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_ret = func((void*)data, type, start, _sz); \
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if (!_ret) \
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return false; \
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} while (0)
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while (itr < itrEnd) {
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if (itr[0] == '<') {
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if (itr + 1 >= itrEnd) {
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CB(SimpleXMLType::Error, itr, itrEnd);
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return false;
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//Invalid case
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if (itr + 1 >= itrEnd) return false;
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size_t toff = 0;
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SimpleXMLType type = _getXMLType(itr, itrEnd, toff);
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const char* p;
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if (type == SimpleXMLType::CData) p = _simpleXmlFindEndCdataTag(itr + 1 + toff, itrEnd);
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else if (type == SimpleXMLType::DoctypeChild) p = _simpleXmlFindDoctypeChildEndTag(itr + 1 + toff, itrEnd);
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else if (type == SimpleXMLType::Comment) p = _simpleXmlFindEndCommentTag(itr + 1 + toff, itrEnd);
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else p = _simpleXmlFindEndTag(itr + 1 + toff, itrEnd);
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if (p) {
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//Invalid case: '<' nested
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if (*p == '<') return false;
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const char *start, *end;
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start = itr + 1 + toff;
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end = p;
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switch (type) {
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case SimpleXMLType::Open: {
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if (p[-1] == '/') {
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type = SimpleXMLType::OpenEmpty;
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end--;
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}
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break;
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}
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case SimpleXMLType::CData: {
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if (!memcmp(p - 2, "]]", 2)) end -= 2;
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break;
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}
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case SimpleXMLType::Processing: {
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if (p[-1] == '?') end--;
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break;
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}
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case SimpleXMLType::Comment: {
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if (!memcmp(p - 2, "--", 2)) end -= 2;
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break;
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}
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default: {
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break;
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}
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}
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if (strip && (type != SimpleXMLType::CData)) {
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start = _skipWhiteSpacesAndXmlEntities(start, end);
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end = _unskipWhiteSpacesAndXmlEntities(end, start);
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}
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if (!func((void*)data, type, start, (size_t)(end - start))) return false;
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itr = p + 1;
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} else {
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SimpleXMLType type;
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size_t toff;
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const char* p;
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if (itr[1] == '/') {
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type = SimpleXMLType::Close;
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toff = 1;
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} else if (itr[1] == '?') {
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type = SimpleXMLType::Processing;
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toff = 1;
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} else if (itr[1] == '!') {
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if ((itr + sizeof("<!DOCTYPE>") - 1 < itrEnd) && (!memcmp(itr + 2, "DOCTYPE", sizeof("DOCTYPE") - 1)) && ((itr[2 + sizeof("DOCTYPE") - 1] == '>') || (isspace((unsigned char)itr[2 + sizeof("DOCTYPE") - 1])))) {
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type = SimpleXMLType::Doctype;
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toff = sizeof("!DOCTYPE") - 1;
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} else if ((itr + sizeof("<!---->") - 1 < itrEnd) && (!memcmp(itr + 2, "--", sizeof("--") - 1))) {
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type = SimpleXMLType::Comment;
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toff = sizeof("!--") - 1;
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} else if ((itr + sizeof("<![CDATA[]]>") - 1 < itrEnd) && (!memcmp(itr + 2, "[CDATA[", sizeof("[CDATA[") - 1))) {
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type = SimpleXMLType::CData;
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toff = sizeof("![CDATA[") - 1;
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} else if (itr + sizeof("<!>") - 1 < itrEnd) {
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type = SimpleXMLType::DoctypeChild;
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toff = sizeof("!") - 1;
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} else {
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type = SimpleXMLType::Open;
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toff = 0;
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}
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} else {
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type = SimpleXMLType::Open;
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toff = 0;
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}
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if (type == SimpleXMLType::CData) p = _simpleXmlFindEndCdataTag(itr + 1 + toff, itrEnd);
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else if (type == SimpleXMLType::DoctypeChild) p = _simpleXmlFindDoctypeChildEndTag(itr + 1 + toff, itrEnd);
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else if (type == SimpleXMLType::Comment) p = _simpleXmlFindEndCommentTag(itr + 1 + toff, itrEnd);
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else p = _simpleXmlFindEndTag(itr + 1 + toff, itrEnd);
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if ((p) && (*p == '<')) {
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type = SimpleXMLType::Error;
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toff = 0;
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}
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if (p) {
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const char *start, *end;
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start = itr + 1 + toff;
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end = p;
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switch (type) {
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case SimpleXMLType::Open: {
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if (p[-1] == '/') {
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type = SimpleXMLType::OpenEmpty;
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end--;
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}
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break;
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}
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case SimpleXMLType::CData: {
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if (!memcmp(p - 2, "]]", 2)) end -= 2;
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break;
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}
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case SimpleXMLType::Processing: {
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if (p[-1] == '?') end--;
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break;
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}
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case SimpleXMLType::Comment: {
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if (!memcmp(p - 2, "--", 2)) end -= 2;
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break;
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}
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default: {
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break;
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}
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}
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if ((strip) && (type != SimpleXMLType::Error) && (type != SimpleXMLType::CData)) {
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start = _skipWhiteSpacesAndXmlEntities(start, end);
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end = _unskipWhiteSpacesAndXmlEntities(end, start);
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}
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CB(type, start, end);
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if (type != SimpleXMLType::Error) itr = p + 1;
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else itr = p;
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} else {
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CB(SimpleXMLType::Error, itr, itrEnd);
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return false;
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}
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return false;
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}
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} else {
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const char *p, *end;
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@ -442,7 +427,7 @@ bool simpleXmlParse(const char* buf, unsigned bufLength, bool strip, simpleXMLCb
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p = itr;
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p = _skipWhiteSpacesAndXmlEntities(p, itrEnd);
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if (p) {
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CB(SimpleXMLType::Ignored, itr, p);
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if (!func((void*)data, SimpleXMLType::Ignored, itr, (size_t)(p - itr))) return false;
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itr = p;
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}
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}
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@ -453,16 +438,13 @@ bool simpleXmlParse(const char* buf, unsigned bufLength, bool strip, simpleXMLCb
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end = p;
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if (strip) end = _unskipWhiteSpacesAndXmlEntities(end, itr);
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if (itr != end) CB(SimpleXMLType::Data, itr, end);
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if (itr != end && !func((void*)data, SimpleXMLType::Data, itr, (size_t)(end - itr))) return false;
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if ((strip) && (end < p)) CB(SimpleXMLType::Ignored, end, p);
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if (strip && (end < p) && !func((void*)data, SimpleXMLType::Ignored, end, (size_t)(p - end))) return false;
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itr = p;
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}
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}
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#undef CB
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return true;
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}
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