Fix handling of 0-length streams (Issue #111)

Author: michaelrsweet

CHANGES.md

@@ -7,6 +7,7 @@ v1.5.1 - YYYY-MM-DD
 - Fixed output of special characters in name values (Issue #106)
 - Fixed output of special characters in string values (Issue #107)
 - Fixed output of large integers in dictionaries (Issue #108)
+- Fixed handling of 0-length streams (Issue #111)
 
 
 v1.5.0 - 2025-03-06

pdfio-object.c

@@ -307,7 +307,8 @@ pdfioObjGetLength(pdfio_obj_t *obj)	// I - Object
 
   if ((lenobj = pdfioDictGetObj(obj->value.value.dict, "Length")) == NULL)
   {
-    _pdfioFileError(obj->pdf, "Unable to get length of stream.");
+    if (!_pdfioDictGetValue(obj->value.value.dict, "Length"))
+      _pdfioFileError(obj->pdf, "Unable to get length of stream.");
     return (0);
   }
 

pdfio-stream.c

@@ -439,7 +439,7 @@ _pdfioStreamOpen(pdfio_obj_t *obj,	// I - Object
   st->pdf = obj->pdf;
   st->obj = obj;
 
-  if ((st->remaining = pdfioObjGetLength(obj)) == 0)
+  if ((st->remaining = pdfioObjGetLength(obj)) == 0 && !_pdfioDictGetValue(pdfioObjGetDict(obj), "Length"))
   {
     _pdfioFileError(obj->pdf, "No stream data.");
     goto error;