mirror of
https://github.com/qpdf/qpdf.git
synced 2024-09-28 04:59:05 +00:00
Find header without PCRE
This commit is contained in:
parent
296b679d6e
commit
1765c6ec20
@ -1027,6 +1027,9 @@ class QPDF
|
||||
bool (QPDF::*checker)();
|
||||
};
|
||||
|
||||
// Methods to support pattern finding
|
||||
bool findHeader();
|
||||
|
||||
// methods to support linearization checking -- implemented in
|
||||
// QPDF_linearization.cc
|
||||
void readLinearizationData();
|
||||
|
@ -202,27 +202,45 @@ QPDF::getWarnings()
|
||||
return result;
|
||||
}
|
||||
|
||||
void
|
||||
QPDF::parse(char const* password)
|
||||
bool
|
||||
QPDF::findHeader()
|
||||
{
|
||||
PCRE header_re("\\A((?s).*?)%PDF-(\\d+.\\d+)\\b");
|
||||
PCRE eof_re("(?s:startxref\\s+(\\d+)\\s+%%EOF\\b)");
|
||||
|
||||
if (password)
|
||||
qpdf_offset_t global_offset = this->file->tell();
|
||||
std::string line = this->file->readLine(1024);
|
||||
char const* p = line.c_str();
|
||||
if (strncmp(p, "%PDF-", 5) != 0)
|
||||
{
|
||||
this->provided_password = password;
|
||||
throw std::logic_error("findHeader is not looking at %PDF-");
|
||||
}
|
||||
|
||||
// Find the header anywhere in the first 1024 bytes of the file,
|
||||
// plus add a little extra space for the header itself.
|
||||
char buffer[1045];
|
||||
memset(buffer, '\0', sizeof(buffer));
|
||||
this->file->read(buffer, sizeof(buffer) - 1);
|
||||
std::string line(buffer);
|
||||
PCRE::Match m1 = header_re.match(line.c_str());
|
||||
if (m1)
|
||||
p += 5;
|
||||
std::string version;
|
||||
// Note: The string returned by line.c_str() is always
|
||||
// null-terminated. The code below never overruns the buffer
|
||||
// because a null character always short-circuits further
|
||||
// advancement.
|
||||
bool valid = QUtil::is_digit(*p);
|
||||
if (valid)
|
||||
{
|
||||
size_t global_offset = m1.getMatch(1).length();
|
||||
while (QUtil::is_digit(*p))
|
||||
{
|
||||
version.append(1, *p++);
|
||||
}
|
||||
if ((*p == '.') && QUtil::is_digit(*(p+1)))
|
||||
{
|
||||
version.append(1, *p++);
|
||||
while (QUtil::is_digit(*p))
|
||||
{
|
||||
version.append(1, *p++);
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
valid = false;
|
||||
}
|
||||
}
|
||||
if (valid)
|
||||
{
|
||||
this->pdf_version = version;
|
||||
if (global_offset != 0)
|
||||
{
|
||||
// Empirical evidence strongly suggests that when there is
|
||||
@ -232,9 +250,23 @@ QPDF::parse(char const* password)
|
||||
QTC::TC("qpdf", "QPDF global offset");
|
||||
this->file = new OffsetInputSource(this->file, global_offset);
|
||||
}
|
||||
this->pdf_version = m1.getMatch(2);
|
||||
}
|
||||
else
|
||||
return valid;
|
||||
}
|
||||
|
||||
void
|
||||
QPDF::parse(char const* password)
|
||||
{
|
||||
PCRE eof_re("(?s:startxref\\s+(\\d+)\\s+%%EOF\\b)");
|
||||
|
||||
if (password)
|
||||
{
|
||||
this->provided_password = password;
|
||||
}
|
||||
|
||||
// Find the header anywhere in the first 1024 bytes of the file.
|
||||
PatternFinder hf(*this, &QPDF::findHeader);
|
||||
if (! this->file->findFirst("%PDF-", 0, 1024, hf))
|
||||
{
|
||||
QTC::TC("qpdf", "QPDF not a pdf file");
|
||||
warn(QPDFExc(qpdf_e_damaged_pdf, this->file->getName(),
|
||||
|
@ -1,3 +1,4 @@
|
||||
WARNING: issue-118.pdf: can't find PDF header
|
||||
WARNING: issue-118.pdf (file position 732): loop detected resolving object 2 0
|
||||
WARNING: issue-118.pdf (xref stream: object 8 0, file position 732): supposed object stream 2 is not a stream
|
||||
issue-118.pdf (file position 732): unable to find /Root dictionary
|
||||
|
@ -1,3 +1,4 @@
|
||||
WARNING: issue-51.pdf: can't find PDF header
|
||||
WARNING: issue-51.pdf: reported number of objects (0) inconsistent with actual number of objects (9)
|
||||
WARNING: issue-51.pdf (object 7 0, file position 553): expected endobj
|
||||
WARNING: issue-51.pdf (object 1 0, file position 359): expected endobj
|
||||
|
Loading…
Reference in New Issue
Block a user