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Code Issues Releases Wiki Activity

Prevent seeking before beginning of BufferInputSource

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This commit is contained in:
Jay Berkenbilt 2012-07-18 09:50:05 -04:00
parent 8ea2f8441d
commit 8657c6f004
1 changed files with 14 additions and 0 deletions
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14
libqpdf/QPDF.cc
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@ -231,6 +231,10 @@ QPDF::BufferInputSource::~BufferInputSource()
qpdf_offset_t
QPDF::BufferInputSource::findAndSkipNextEOL()
{
if (this->cur_offset < 0)
{
throw std::logic_error("INTERNAL ERROR: BufferInputSource offset < 0");
}
qpdf_offset_t end_pos = (qpdf_offset_t) this->buf->getSize();
if (this->cur_offset >= end_pos)
{
@ -301,6 +305,12 @@ QPDF::BufferInputSource::seek(qpdf_offset_t offset, int whence)
"INTERNAL ERROR: invalid argument to BufferInputSource::seek");
break;
}
if (this->cur_offset < 0)
{
throw std::runtime_error(
this->description + ": seek before beginning of buffer");
}
}
void
@ -312,6 +322,10 @@ QPDF::BufferInputSource::rewind()
size_t
QPDF::BufferInputSource::read(char* buffer, size_t length)
{
if (this->cur_offset < 0)
{
throw std::logic_error("INTERNAL ERROR: BufferInputSource offset < 0");
}
qpdf_offset_t end_pos = (qpdf_offset_t) this->buf->getSize();
if (this->cur_offset >= end_pos)
{