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escape invalid XML characters with _xHHHH_ when writing escaped

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As defined in OOXML, see code comments.

Change-Id: I8ce0075790f2d4ef6227a9474c68466e0793dce2
Reviewed-on: https://gerrit.libreoffice.org/34824
Reviewed-by: Eike Rathke <erack@redhat.com>
Tested-by: Jenkins <ci@libreoffice.org>
This commit is contained in:
Eike Rathke
2017-03-02 17:06:54 +01:00
parent f3c4147883
commit 8b25b67d52
2 changed files with 117 additions and 17 deletions
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131
sax/source/tools/fastserializer.cxx
View File

@@ -59,6 +59,7 @@ namespace sax_fastparser {
, mbMarkStackEmpty(true)
, mpDoubleStr(nullptr)
, mnDoubleStrCapacity(RTL_STR_MAX_VALUEOFDOUBLE)
, mbXescape(true)
{
rtl_string_new_WithLength(&mpDoubleStr, mnDoubleStrCapacity);
mxFastTokenHandler = css::xml::sax::FastTokenHandler::create(
@@ -101,7 +102,6 @@ namespace sax_fastparser {
write( sOutput.getStr(), sOutput.getLength(), bEscape );
}
#if OSL_DEBUG_LEVEL > 0
/** Characters not allowed in XML 1.0
XML 1.1 would exclude only U+0000
*/
@@ -119,7 +119,11 @@ namespace sax_fastparser {
}
return true;
}
#endif
bool isHexDigit( char c )
{
return ('0' <= c && c <= '9') || ('A' <= c && c <= 'F') || ('a' <= c && c <= 'f');
}
void FastSaxSerializer::write( const char* pStr, sal_Int32 nLen, bool bEscape )
{
@@ -133,6 +137,9 @@ namespace sax_fastparser {
}
bool bGood = true;
const sal_Int32 kXescapeLen = 7;
char bufXescape[kXescapeLen+1];
sal_Int32 nNextXescape = 0;
for (sal_Int32 i = 0; i < nLen; ++i)
{
char c = pStr[ i ];
@@ -143,24 +150,114 @@ namespace sax_fastparser {
case '&': writeBytes( "&amp;", 5 ); break;
case '\'': writeBytes( "&apos;", 6 ); break;
case '"': writeBytes( "&quot;", 6 ); break;
case '\n': writeBytes( "&#10;", 5 ); break;
case '\r': writeBytes( "&#13;", 5 ); break;
default:
#if OSL_DEBUG_LEVEL > 0
/* FIXME: we should escape such invalid characters
* in the _xHHHH_ form OOXML uses. Note that also a
* literal "_x0008_" would have to be escaped then
* as _x005F_x0008_ (where only the leading '_' is
* escaped as _x005F_). */
if (invalidChar(pStr[i]))
#if 0
case '\t':
// Seems OOXML prefers the _xHHHH_ escape over the
// entity in *some* cases, apparently in attribute
// values but not in element data.
// Would need to distinguish at a higher level.
if (mbXescape)
{
bGood = false;
// The SAL_WARN() for the single character is
// issued in writeBytes(), just gather for the
// SAL_WARN_IF() below.
snprintf( bufXescape, kXescapeLen+1, "_x%04x_",
static_cast<unsigned int>(static_cast<unsigned char>(c)));
writeBytes( bufXescape, kXescapeLen);
}
else
{
// We did never write this, but literal tab
// instead. Should we?
writeBytes( "&#9;", 4 );
}
break;
#endif
case '\n':
#if 0
if (mbXescape)
{
snprintf( bufXescape, kXescapeLen+1, "_x%04x_",
static_cast<unsigned int>(static_cast<unsigned char>(c)));
writeBytes( bufXescape, kXescapeLen);
}
else
#endif
{
writeBytes( "&#10;", 5 );
}
break;
case '\r':
#if 0
if (mbXescape)
{
snprintf( bufXescape, kXescapeLen+1, "_x%04x_",
static_cast<unsigned int>(static_cast<unsigned char>(c)));
writeBytes( bufXescape, kXescapeLen);
}
else
#endif
{
writeBytes( "&#13;", 5 );
}
break;
default:
if (mbXescape)
{
// Escape characters not valid in XML 1.0 as
// _xHHHH_. A literal "_xHHHH_" has to be
// escaped as _x005F_xHHHH_ (effectively
// escaping the leading '_').
// See ECMA-376-1:2016 page 3736,
// 22.4.2.4 bstr (Basic String)
// for reference.
if (c == '_' && i >= nNextXescape && i <= nLen - kXescapeLen &&
pStr[i+6] == '_' &&
((pStr[i+1] | 0x20) == 'x') &&
isHexDigit( pStr[i+2] ) &&
isHexDigit( pStr[i+3] ) &&
isHexDigit( pStr[i+4] ) &&
isHexDigit( pStr[i+5] ))
{
// OOXML has the odd habit to write some
// names using this that when re-saving
// should *not* be escaped, specifically
// _x0020_ for blanks in w:xpath values.
if (strncmp( pStr+i+2, "0020", 4) != 0)
{
writeBytes( "_x005F_", kXescapeLen);
// Remember this escapement so in
// _xHHHH_xHHHH_ only the first '_' is
// escaped.
nNextXescape = i + kXescapeLen;
break;
}
}
if (invalidChar(c))
{
snprintf( bufXescape, kXescapeLen+1, "_x%04x_",
static_cast<unsigned int>(static_cast<unsigned char>(c)));
writeBytes( bufXescape, kXescapeLen);
break;
}
/* TODO: also U+FFFE and U+FFFF are not allowed
* in XML 1.0, assuming we're writing UTF-8
* those should be escaped as well to be
* conformant. Likely that would involve
* scanning for both encoded sequences and
* write as _xHHHH_? */
}
#if OSL_DEBUG_LEVEL > 0
else
{
if (bGood && invalidChar(pStr[i]))
{
bGood = false;
// The SAL_WARN() for the single character is
// issued in writeBytes(), just gather for the
// SAL_WARN_IF() below.
}
}
#endif
writeBytes( &c, 1 ); break;
writeBytes( &c, 1 );
break;
}
}
SAL_WARN_IF( !bGood && nLen > 1, "sax", "in '" << OString(pStr,std::min<sal_Int32>(nLen,42)) << "'");

3
sax/source/tools/fastserializer.hxx
View File

@@ -228,6 +228,9 @@ private:
rtl_String *mpDoubleStr;
sal_Int32 mnDoubleStrCapacity;
TokenValueList maTokenValues;
bool mbXescape; ///< whether to escape invalid XML characters as _xHHHH_ in write(const char*,sal_Int32,true)
/* TODO: make that configurable from the outside for
* some specific cases? */
#ifdef DBG_UTIL
std::stack<sal_Int32> m_DebugStartedElements;