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Fix opening of certain encrypted PDF files (Issue #62)

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Michael R Sweet 2024-08-21 11:28:39 -04:00
parent 7c3651671b
commit 7d22477917
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3 changed files with 16 additions and 7 deletions
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1
CHANGES.md
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@ -6,6 +6,7 @@ v1.3.2 - YYYY-MM-DD
-------------------
- Added some more sanity checks to the TrueType font reader.
- Fixed an issue when opening certain encrypted PDF files (Issue #62)
v1.3.1 - 2024-08-05

12
pdfio-file.c
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@ -648,11 +648,12 @@ pdfioFileFindObj(
if ((current = number - 1) >= pdf->num_objs)
current = pdf->num_objs / 2;
PDFIO_DEBUG("pdfioFileFindObj: objs[current=%lu]=%p\n", (unsigned long)current, (void *)pdf->objs[current]);
PDFIO_DEBUG("pdfioFileFindObj: objs[current=%lu]=%p(%lu)\n", (unsigned long)current, (void *)pdf->objs[current], (unsigned long)(pdf->objs[current] ? pdf->objs[current]->number : 0));
if (number == pdf->objs[current]->number)
{
// Fast match...
PDFIO_DEBUG("pdfioFileFindObj: Returning %lu (%p)\n", (unsigned long)current, pdf->objs[current]);
return (pdf->objs[current]);
}
else if (number < pdf->objs[current]->number)
@ -679,11 +680,20 @@ pdfioFileFindObj(
}
if (number == pdf->objs[left]->number)
{
PDFIO_DEBUG("pdfioFileFindObj: Returning %lu (%p)\n", (unsigned long)left, pdf->objs[left]);
return (pdf->objs[left]);
}
else if (number == pdf->objs[right]->number)
{
PDFIO_DEBUG("pdfioFileFindObj: Returning %lu (%p)\n", (unsigned long)right, pdf->objs[right]);
return (pdf->objs[right]);
}
else
{
PDFIO_DEBUG("pdfioFileFindObj: Returning NULL\n");
return (NULL);
}
}

10
pdfio-stream.c
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@ -408,6 +408,7 @@ _pdfioStreamOpen(pdfio_obj_t *obj, // I - Object
pdfio_stream_t *st; // Stream
pdfio_dict_t *dict = pdfioObjGetDict(obj);
// Object dictionary
const char *type; // Object type
PDFIO_DEBUG("_pdfioStreamOpen(obj=%p(%u), decode=%s)\n", obj, (unsigned)obj->number, decode ? "true" : "false");
@ -434,7 +435,9 @@ _pdfioStreamOpen(pdfio_obj_t *obj, // I - Object
return (NULL);
}
if (obj->pdf->encryption)
type = pdfioObjGetType(obj);
if (obj->pdf->encryption && (!type || strcmp(type, "XRef")))
{
uint8_t iv[64]; // Initialization vector
size_t ivlen; // Length of initialization vector, if any
@ -1069,11 +1072,6 @@ stream_read(pdfio_stream_t *st, // I - Stream
_pdfioFileError(st->pdf, "Unable to decompress stream data for object %ld: %s", (long)st->obj->number, zstrerror(status));
return (-1);
}
else if (avail_in == st->flate.avail_in && avail_out == st->flate.avail_out)
{
_pdfioFileError(st->pdf, "Corrupt stream data.");
return (-1);
}
return (st->flate.next_out - (Bytef *)buffer);
}