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https://gitlab.gnome.org/GNOME/libxml2
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html: Rework htmlLookupSequence
Rename to htmlLookupString and use strstr for increased performance.
This commit is contained in:
Nick Wellnhofer
parent
637215a4de
commit
dc2d498318
122
HTMLparser.c
122
HTMLparser.c
@ -5265,67 +5265,54 @@ htmlParseLookupGt(xmlParserCtxtPtr ctxt) {
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}
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/**
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* htmlParseLookupSequence:
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* @ctxt: an HTML parser context
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* @first: the first char to lookup
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* @next: the next char to lookup or zero
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* @third: the next char to lookup or zero
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* htmlParseLookupString:
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* @ctxt: an XML parser context
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* @startDelta: delta to apply at the start
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* @str: string
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* @strLen: length of string
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*
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* Try to find if a sequence (first, next, third) or just (first next) or
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* (first) is available in the input stream.
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* This function has a side effect of (possibly) incrementing ctxt->checkIndex
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* to avoid rescanning sequences of bytes, it DOES change the state of the
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* parser, do not use liberally.
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* This is basically similar to xmlParseLookupSequence()
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*
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* Returns the index to the current parsing point if the full sequence
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* is available, -1 otherwise.
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* Check whether the input buffer contains a string.
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*/
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static int
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htmlParseLookupSequence(htmlParserCtxtPtr ctxt, xmlChar first,
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xmlChar next, xmlChar third) {
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size_t base, len;
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htmlParserInputPtr in;
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const xmlChar *buf;
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int quote;
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htmlParseLookupString(xmlParserCtxtPtr ctxt, size_t startDelta,
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const char *str, size_t strLen) {
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const xmlChar *cur, *term;
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int ret;
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in = ctxt->input;
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if (in == NULL)
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return (-1);
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base = ctxt->checkIndex;
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quote = ctxt->endCheckState;
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buf = in->cur;
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len = in->end - in->cur;
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/* take into account the sequence length */
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if (third)
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len -= 2;
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else if (next)
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len--;
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for (; base < len; base++) {
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if (base >= INT_MAX / 2) {
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ctxt->checkIndex = 0;
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ctxt->endCheckState = 0;
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return (base - 2);
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}
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if (buf[base] == first) {
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if (third != 0) {
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if ((buf[base + 1] != next) || (buf[base + 2] != third))
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continue;
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} else if (next != 0) {
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if (buf[base + 1] != next)
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continue;
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}
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ctxt->checkIndex = 0;
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ctxt->endCheckState = 0;
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return (base);
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}
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if (ctxt->checkIndex == 0) {
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cur = ctxt->input->cur + startDelta;
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} else {
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cur = ctxt->input->cur + ctxt->checkIndex;
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}
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ctxt->checkIndex = base;
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ctxt->endCheckState = quote;
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return (-1);
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term = BAD_CAST strstr((const char *) cur, str);
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if (term == NULL) {
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const xmlChar *end = ctxt->input->end;
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size_t index;
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/* Rescan (strLen - 1) characters. */
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if ((size_t) (end - cur) < strLen)
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end = cur;
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else
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end -= strLen - 1;
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index = end - ctxt->input->cur;
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if (index > INT_MAX / 2) {
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ctxt->checkIndex = 0;
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ret = INT_MAX / 2;
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} else {
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ctxt->checkIndex = index;
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ret = -1;
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}
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} else {
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ctxt->checkIndex = 0;
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if (term - ctxt->input->cur > INT_MAX / 2)
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ret = INT_MAX / 2;
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else
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ret = term - ctxt->input->cur;
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}
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return(ret);
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}
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/**
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@ -5338,7 +5325,6 @@ htmlParseLookupSequence(htmlParserCtxtPtr ctxt, xmlChar first,
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* This function has a side effect of (possibly) incrementing ctxt->checkIndex
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* to avoid rescanning sequences of bytes, it DOES change the state of the
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* parser, do not use liberally.
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* This wraps to htmlParseLookupSequence()
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*
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* Returns the index to the current parsing point if the full sequence is available, -1 otherwise.
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*/
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@ -5349,7 +5335,7 @@ htmlParseLookupCommentEnd(htmlParserCtxtPtr ctxt)
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int offset;
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while (1) {
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mark = htmlParseLookupSequence(ctxt, '-', '-', 0);
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mark = htmlParseLookupString(ctxt, 2, "--", 2);
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if (mark < 0)
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break;
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if ((NXT(mark+2) == '>') ||
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@ -5457,7 +5443,7 @@ htmlParseTryOrFinish(htmlParserCtxtPtr ctxt, int terminate) {
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(UPP(6) == 'Y') && (UPP(7) == 'P') &&
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(UPP(8) == 'E')) {
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if ((!terminate) &&
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(htmlParseLookupSequence(ctxt, '>', 0, 0) < 0))
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(htmlParseLookupString(ctxt, 9, ">", 1) < 0))
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goto done;
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htmlParseDocTypeDecl(ctxt);
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ctxt->instate = XML_PARSER_PROLOG;
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@ -5493,7 +5479,7 @@ htmlParseTryOrFinish(htmlParserCtxtPtr ctxt, int terminate) {
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ctxt->instate = XML_PARSER_MISC;
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} else if ((cur == '<') && (next == '?')) {
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if ((!terminate) &&
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(htmlParseLookupSequence(ctxt, '>', 0, 0) < 0))
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(htmlParseLookupString(ctxt, 2, ">", 1) < 0))
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goto done;
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htmlParsePI(ctxt);
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ctxt->instate = XML_PARSER_MISC;
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@ -5503,7 +5489,7 @@ htmlParseTryOrFinish(htmlParserCtxtPtr ctxt, int terminate) {
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(UPP(6) == 'Y') && (UPP(7) == 'P') &&
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(UPP(8) == 'E')) {
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if ((!terminate) &&
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(htmlParseLookupSequence(ctxt, '>', 0, 0) < 0))
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(htmlParseLookupString(ctxt, 9, ">", 1) < 0))
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goto done;
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htmlParseDocTypeDecl(ctxt);
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ctxt->instate = XML_PARSER_PROLOG;
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@ -5529,7 +5515,7 @@ htmlParseTryOrFinish(htmlParserCtxtPtr ctxt, int terminate) {
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ctxt->instate = XML_PARSER_PROLOG;
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} else if ((cur == '<') && (next == '?')) {
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if ((!terminate) &&
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(htmlParseLookupSequence(ctxt, '>', 0, 0) < 0))
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(htmlParseLookupString(ctxt, 2, ">", 1) < 0))
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goto done;
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htmlParsePI(ctxt);
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ctxt->instate = XML_PARSER_PROLOG;
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@ -5560,7 +5546,7 @@ htmlParseTryOrFinish(htmlParserCtxtPtr ctxt, int terminate) {
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ctxt->instate = XML_PARSER_EPILOG;
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} else if ((cur == '<') && (next == '?')) {
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if ((!terminate) &&
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(htmlParseLookupSequence(ctxt, '>', 0, 0) < 0))
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(htmlParseLookupString(ctxt, 2, ">", 1) < 0))
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goto done;
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htmlParsePI(ctxt);
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ctxt->instate = XML_PARSER_EPILOG;
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@ -5732,7 +5718,7 @@ htmlParseTryOrFinish(htmlParserCtxtPtr ctxt, int terminate) {
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int idx;
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xmlChar val;
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idx = htmlParseLookupSequence(ctxt, '<', '/', 0);
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idx = htmlParseLookupString(ctxt, 0, "</", 2);
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if (idx < 0)
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goto done;
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val = in->cur[idx + 2];
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@ -5762,7 +5748,7 @@ htmlParseTryOrFinish(htmlParserCtxtPtr ctxt, int terminate) {
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(UPP(6) == 'Y') && (UPP(7) == 'P') &&
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(UPP(8) == 'E')) {
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if ((!terminate) &&
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(htmlParseLookupSequence(ctxt, '>', 0, 0) < 0))
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(htmlParseLookupString(ctxt, 9, ">", 1) < 0))
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goto done;
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htmlParseErr(ctxt, XML_HTML_STRUCURE_ERROR,
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"Misplaced DOCTYPE declaration\n",
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@ -5776,13 +5762,13 @@ htmlParseTryOrFinish(htmlParserCtxtPtr ctxt, int terminate) {
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ctxt->instate = XML_PARSER_CONTENT;
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} else {
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if ((!terminate) &&
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(htmlParseLookupSequence(ctxt, '>', 0, 0) < 0))
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(htmlParseLookupString(ctxt, 2, ">", 1) < 0))
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goto done;
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htmlSkipBogusComment(ctxt);
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}
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} else if ((cur == '<') && (next == '?')) {
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if ((!terminate) &&
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(htmlParseLookupSequence(ctxt, '>', 0, 0) < 0))
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(htmlParseLookupString(ctxt, 2, ">", 1) < 0))
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goto done;
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htmlParsePI(ctxt);
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ctxt->instate = XML_PARSER_CONTENT;
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@ -5810,7 +5796,7 @@ htmlParseTryOrFinish(htmlParserCtxtPtr ctxt, int terminate) {
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* data detection.
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*/
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if ((!terminate) &&
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(htmlParseLookupSequence(ctxt, '<', 0, 0) < 0))
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(htmlParseLookupString(ctxt, 0, "<", 1) < 0))
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goto done;
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ctxt->checkIndex = 0;
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while ((PARSER_STOPPED(ctxt) == 0) &&
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