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parser: Pop PEs that start markup declarations explicitly

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We currently only handle "Validity constraint: Proper Declaration/PE
Nesting", but we must detect "Well-formedness constraint: PE Between
Declarations" separately:

> The replacement text of a parameter entity reference in a DeclSep must
> match the production extSubsetDecl.

PEs in DeclSeps are PEs that start with a full markup declaration (or
another PE). These are handled in xmParse{Internal|External}Subset. We
set a flag on these PEs and don't close them implicitly in
xmlSkipBlankCharsPE. This will make unterminated declarations in such
PEs cause a parser error. The PEs are closed explicitly in
xmParse{Internal|External}Subset, the only location where they are
allowed to end.
This commit is contained in:
Nick Wellnhofer
2025-05-20 19:40:06 +02:00
parent 2a60ca06c0
commit 2f3655c9c3
9 changed files with 148 additions and 73 deletions
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include/private/parser.h
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@@ -33,6 +33,7 @@
#define XML_INPUT_USES_ENC_DECL (1u << 4)
#define XML_INPUT_ENCODING_ERROR (1u << 5)
#define XML_INPUT_PROGRESSIVE (1u << 6)
#define XML_INPUT_MARKUP_DECL (1u << 7)
#define PARSER_STOPPED(ctxt) ((ctxt)->disableSAX > 1)