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Code Issues Releases Wiki Activity

Add range_check method to QIntC

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This commit is contained in:
Jay Berkenbilt 2020-10-22 05:44:48 -04:00
parent 24196c08cb
commit 7f4a4df919
3 changed files with 16 additions and 19 deletions
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2
include/qpdf/BufferInputSource.hh
View File

@ -54,8 +54,6 @@ class BufferInputSource: public InputSource
virtual void unreadCh(char ch);
private:
static void range_check(qpdf_offset_t cur, qpdf_offset_t delta);
class Members
{
friend class BufferInputSource;

14
include/qpdf/QIntC.hh
View File

@ -222,6 +222,20 @@ namespace QIntC // QIntC = qpdf Integer Conversion
{
return IntConverter<T, unsigned long long>::convert(i);
}
template <typename T>
void range_check(T const& cur, T const& delta)
{
if ((delta > 0) &&
((std::numeric_limits<T>::max() - cur) < delta))
{
std::ostringstream msg;
msg.imbue(std::locale::classic());
msg << "adding " << delta << " to " << cur
<< " would cause an integer overflow";
throw std::range_error(msg.str());
}
}
};
#endif // QINTC_HH

19
libqpdf/BufferInputSource.cc
View File

@ -101,21 +101,6 @@ BufferInputSource::tell()
return this->m->cur_offset;
}
void
BufferInputSource::range_check(qpdf_offset_t cur, qpdf_offset_t delta)
{
if ((delta > 0) &&
((std::numeric_limits<qpdf_offset_t>::max() - cur) < delta))
{
std::ostringstream msg;
msg.imbue(std::locale::classic());
msg << "seeking forward from " << cur
<< " by " << delta
<< " would cause an overflow of the offset type";
throw std::range_error(msg.str());
}
}
void
BufferInputSource::seek(qpdf_offset_t offset, int whence)
{
@ -126,12 +111,12 @@ BufferInputSource::seek(qpdf_offset_t offset, int whence)
break;
case SEEK_END:
range_check(this->m->max_offset, offset);
QIntC::range_check(this->m->max_offset, offset);
this->m->cur_offset = this->m->max_offset + offset;
break;
case SEEK_CUR:
range_check(this->m->cur_offset, offset);
QIntC::range_check(this->m->cur_offset, offset);
this->m->cur_offset += offset;
break;