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Add some protection against opening multiple streams in the same file at the same time.

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This commit is contained in:
Michael R Sweet
2022-07-04 13:03:11 -04:00
parent 50f27974cf
commit 067683cbcd
5 changed files with 33 additions and 7 deletions
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27
pdfio-object.c
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@ -1,7 +1,7 @@
//
// PDF object functions for PDFio.
//
// Copyright © 2021 by Michael R Sweet.
// Copyright © 2021-2022 by Michael R Sweet.
//
// Licensed under Apache License v2.0. See the file "LICENSE" for more
// information.
@ -33,8 +33,14 @@ pdfioObjClose(pdfio_obj_t *obj) // I - Object
if (!obj)
return (false);
// Clear the current object pointer...
obj->pdf->current_obj = NULL;
if (obj->pdf->mode != _PDFIO_MODE_WRITE)
return (true); // Nothing to do when reading
{
// Nothing to do when reading
return (true);
}
// Write what remains for the object...
if (!obj->offset)
@ -165,6 +171,12 @@ pdfioObjCreateStream(
return (NULL);
}
if (obj->pdf->current_obj)
{
_pdfioFileError(obj->pdf, "Another object (%u) is already open.", (unsigned)obj->pdf->current_obj->number);
return (NULL);
}
// Write the header...
if (!_pdfioDictGetValue(obj->value.value.dict, "Length"))
{
@ -193,7 +205,8 @@ pdfioObjCreateStream(
if (!_pdfioFilePuts(obj->pdf, "stream\n"))
return (NULL);
obj->stream_offset = _pdfioFileTell(obj->pdf);
obj->stream_offset = _pdfioFileTell(obj->pdf);
obj->pdf->current_obj = obj;
// Return the new stream...
return (_pdfioStreamCreate(obj, length_obj, filter));
@ -454,6 +467,12 @@ pdfioObjOpenStream(pdfio_obj_t *obj, // I - Object
if (!obj)
return (NULL);
if (obj->pdf->current_obj)
{
_pdfioFileError(obj->pdf, "Another object (%u) is already open.", (unsigned)obj->pdf->current_obj->number);
return (NULL);
}
// Make sure we've loaded the object dictionary...
if (!obj->value.type)
{
@ -466,6 +485,8 @@ pdfioObjOpenStream(pdfio_obj_t *obj, // I - Object
return (NULL);
// Open the stream...
obj->pdf->current_obj = obj;
return (_pdfioStreamOpen(obj, decode));
}