Top-level json: write incrementally

This commit just changes the order in which fields are written to the
json without changing their content. All the json files in the test
suite were modified with this script to ensure that we didn't get any
changes other than ordering.

----------
#!/usr/bin/env python3
import json
import sys

def json_dumps(data):
    return json.dumps(data, ensure_ascii=False,
                      indent=2, separators=(',', ': '))

for filename in sys.argv[1:]:
    with open(filename, 'r') as f:
        data = json.loads(f.read())
    newdata = {}
    for i in ('version', 'parameters', 'pages', 'pagelabels',
              'acroform', 'attachments', 'encrypt', 'outlines',
              'objects', 'objectinfo'):
        if i in data:
            newdata[i] = data[i]
print(json_dumps(newdata))
----------

1 files changed, 8 insertions, 8 deletions

diff --git a/include/qpdf/QPDFJob.hh b/include/qpdf/QPDFJob.hh
index 2f9d1984..352348ab 100644
--- a/include/qpdf/QPDFJob.hh
+++ b/include/qpdf/QPDFJob.hh
@@ -512,14 +512,14 @@ class QPDFJob
     // JSON
     void doJSON(QPDF& pdf, Pipeline*);
     std::set<QPDFObjGen> getWantedJSONObjects();
-    void doJSONObjects(QPDF& pdf, JSON& j);
-    void doJSONObjectinfo(QPDF& pdf, JSON& j);
-    void doJSONPages(QPDF& pdf, JSON& j);
-    void doJSONPageLabels(QPDF& pdf, JSON& j);
-    void doJSONOutlines(QPDF& pdf, JSON& j);
-    void doJSONAcroform(QPDF& pdf, JSON& j);
-    void doJSONEncrypt(QPDF& pdf, JSON& j);
-    void doJSONAttachments(QPDF& pdf, JSON& j);
+    void doJSONObjects(Pipeline* p, bool& first, QPDF& pdf);
+    void doJSONObjectinfo(Pipeline* p, bool& first, QPDF& pdf);
+    void doJSONPages(Pipeline* p, bool& first, QPDF& pdf);
+    void doJSONPageLabels(Pipeline* p, bool& first, QPDF& pdf);
+    void doJSONOutlines(Pipeline* p, bool& first, QPDF& pdf);
+    void doJSONAcroform(Pipeline* p, bool& first, QPDF& pdf);
+    void doJSONEncrypt(Pipeline* p, bool& first, QPDF& pdf);
+    void doJSONAttachments(Pipeline* p, bool& first, QPDF& pdf);
 
     enum remove_unref_e { re_auto, re_yes, re_no };