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Code Issues Releases Wiki Activity

Find lindict without PCRE

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This commit is contained in:
Jay Berkenbilt 2017-08-09 20:17:18 -04:00
parent 03aa9679ac
commit 90840be594
2 changed files with 29 additions and 28 deletions
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55
libqpdf/QPDF_linearization.cc
View File

@ -5,7 +5,6 @@
#include <qpdf/QPDFExc.hh>
#include <qpdf/QTC.hh>
#include <qpdf/QUtil.hh>
#include <qpdf/PCRE.hh>
#include <qpdf/Pl_Buffer.hh>
#include <qpdf/Pl_Flate.hh>
#include <qpdf/Pl_Count.hh>
@ -101,38 +100,42 @@ QPDF::isLinearized()
memset(buf, '\0', tbuf_size);
this->file->read(buf, tbuf_size - 1);
PCRE lindict_re("(?s:(\\d+)\\s+0\\s+obj\\s*<<)");
int lindict_obj = -1;
char* p = buf;
while (lindict_obj == -1)
{
PCRE::Match m(lindict_re.match(p));
if (m)
{
lindict_obj = atoi(m.getMatch(1).c_str());
if (m.getMatch(0).find('\n') != std::string::npos)
{
QTC::TC("qpdf", "QPDF lindict found newline");
}
}
else
{
p = static_cast<char*>(memchr(p, '\0', tbuf_size - (p - buf)));
assert(p != 0);
while ((p - buf < tbuf_size) && (*p == 0))
{
++p;
}
if ((p - buf) == tbuf_size)
{
break;
}
QTC::TC("qpdf", "QPDF lindict searching after null");
// Find a digit or end of buffer
while (((p - buf) < tbuf_size) && (! QUtil::is_digit(*p)))
{
++p;
}
if (p - buf == tbuf_size)
{
break;
}
// Seek to the digit. Then skip over digits for a potential
// next iteration.
this->file->seek(p - buf, SEEK_SET);
while (((p - buf) < tbuf_size) && QUtil::is_digit(*p))
{
++p;
}
QPDFTokenizer::Token t1 = readToken(this->file, true);
QPDFTokenizer::Token t2 = readToken(this->file, true);
QPDFTokenizer::Token t3 = readToken(this->file, true);
QPDFTokenizer::Token t4 = readToken(this->file, true);
if ((t1.getType() == QPDFTokenizer::tt_integer) &&
(t2.getType() == QPDFTokenizer::tt_integer) &&
(t3 == QPDFTokenizer::Token(QPDFTokenizer::tt_word, "obj")) &&
(t4.getType() == QPDFTokenizer::tt_dict_open))
{
lindict_obj =
static_cast<int>(QUtil::string_to_ll(t1.getValue().c_str()));
}
}
if (lindict_obj == 0)
if (lindict_obj <= 0)
{
return false;
}

2
qpdf/qpdf.testcov
View File

@ -1,5 +1,4 @@
ignored-scope: libtests
QPDF lindict searching after null 0
QPDF err expected endobj 0
QPDF err wrong objid/generation 0
QPDF check objid 1
@ -10,7 +9,6 @@ QPDF hint table length direct 0
QPDF P absent in lindict 0
QPDF P present in lindict 0
QPDF expected n n obj 0
QPDF lindict found newline 0
QPDF /L mismatch 0
QPDF err /T mismatch 0
QPDF err /O mismatch 0