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Pl_Flate: constructor's out_bufsize is now unsigned int

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This is the type we need for the underlying zlib implementation.
This commit is contained in:
Jay Berkenbilt 2019-06-21 00:01:36 -04:00
parent da30764bce
commit f40ffc9d63
3 changed files with 31 additions and 11 deletions
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4
ChangeLog
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@ -1,5 +1,9 @@
2019-06-20 Jay Berkenbilt <ejb@ql.org>
* Change out_bufsize argument to Pl_Flate's constructor for int to
unsigned int for compatibility with underlying zlib
implementation.
* Add methods to QPDFObjectHandle to return the value of Integer
objects as int and unsigned int with range checking and fallback
behavior to avoid silent underflow/overflow conditions.

8
include/qpdf/Pl_Flate.hh
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@ -27,13 +27,13 @@
class Pl_Flate: public Pipeline
{
public:
static int const def_bufsize = 65536;
static unsigned int const def_bufsize = 65536;
enum action_e { a_inflate, a_deflate };
QPDF_DLL
Pl_Flate(char const* identifier, Pipeline* next,
action_e action, int out_bufsize = def_bufsize);
action_e action, unsigned int out_bufsize = def_bufsize);
QPDF_DLL
virtual ~Pl_Flate();
@ -43,11 +43,11 @@ class Pl_Flate: public Pipeline
virtual void finish();
private:
void handleData(unsigned char* data, int len, int flush);
void handleData(unsigned char* data, size_t len, int flush);
void checkError(char const* prefix, int error_code);
unsigned char* outbuf;
int out_bufsize;
size_t out_bufsize;
action_e action;
bool initialized;
void* zdata;

30
libqpdf/Pl_Flate.cc
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@ -1,13 +1,15 @@
#include <qpdf/Pl_Flate.hh>
#include <zlib.h>
#include <string.h>
#include <limits.h>
#include <qpdf/QUtil.hh>
#include <qpdf/QIntC.hh>
Pl_Flate::Pl_Flate(char const* identifier, Pipeline* next,
action_e action, int out_bufsize) :
action_e action, unsigned int out_bufsize_int) :
Pipeline(identifier, next),
out_bufsize(out_bufsize),
out_bufsize(QIntC::to_size(out_bufsize_int)),
action(action),
initialized(false)
{
@ -19,6 +21,13 @@ Pl_Flate::Pl_Flate(char const* identifier, Pipeline* next,
// Windows environment.
this->zdata = new z_stream;
if (out_bufsize > UINT_MAX)
{
throw std::runtime_error(
"Pl_Flate: zlib doesn't support buffer"
" sizes larger than unsigned int");
}
z_stream& zstream = *(static_cast<z_stream*>(this->zdata));
zstream.zalloc = 0;
zstream.zfree = 0;
@ -26,7 +35,7 @@ Pl_Flate::Pl_Flate(char const* identifier, Pipeline* next,
zstream.next_in = 0;
zstream.avail_in = 0;
zstream.next_out = this->outbuf;
zstream.avail_out = out_bufsize;
zstream.avail_out = QIntC::to_uint(out_bufsize);
}
Pl_Flate::~Pl_Flate()
@ -77,11 +86,17 @@ Pl_Flate::write(unsigned char* data, size_t len)
}
void
Pl_Flate::handleData(unsigned char* data, int len, int flush)
Pl_Flate::handleData(unsigned char* data, size_t len, int flush)
{
if (len > UINT_MAX)
{
throw std::runtime_error(
"Pl_Flate: zlib doesn't support data"
" blocks larger than int");
}
z_stream& zstream = *(static_cast<z_stream*>(this->zdata));
zstream.next_in = data;
zstream.avail_in = len;
zstream.avail_in = QIntC::to_uint(len);
if (! this->initialized)
{
@ -156,12 +171,13 @@ Pl_Flate::handleData(unsigned char* data, int len, int flush)
// needed, so we're done for now.
done = true;
}
uLong ready = (this->out_bufsize - zstream.avail_out);
uLong ready =
QIntC::to_ulong(this->out_bufsize - zstream.avail_out);
if (ready > 0)
{
this->getNext()->write(this->outbuf, ready);
zstream.next_out = this->outbuf;
zstream.avail_out = this->out_bufsize;
zstream.avail_out = QIntC::to_uint(this->out_bufsize);
}
}
break;