From 0500d4347a6d31ef05fd860559e380c2e488c194 Mon Sep 17 00:00:00 2001
From: Jay Berkenbilt <ejb@ql.org>
Date: Wed, 4 May 2022 16:28:12 -0400
Subject: JSON: add blob type that generates base64-encoded binary data

---
 libqpdf/JSON.cc | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

(limited to 'libqpdf/JSON.cc')

diff --git a/libqpdf/JSON.cc b/libqpdf/JSON.cc
index 71ea33d7..8549b7ed 100644
--- a/libqpdf/JSON.cc
+++ b/libqpdf/JSON.cc
@@ -1,6 +1,8 @@
 #include <qpdf/JSON.hh>
 
 #include <qpdf/BufferInputSource.hh>
+#include <qpdf/Pl_Base64.hh>
+#include <qpdf/Pl_Concatenate.hh>
 #include <qpdf/Pl_String.hh>
 #include <qpdf/QTC.hh>
 #include <qpdf/QUtil.hh>
@@ -168,6 +170,22 @@ JSON::JSON_null::write(Pipeline* p, size_t) const
     *p << "null";
 }
 
+JSON::JSON_blob::JSON_blob(std::function<void(Pipeline*)> fn) :
+    fn(fn)
+{
+}
+
+void
+JSON::JSON_blob::write(Pipeline* p, size_t) const
+{
+    *p << "\"";
+    Pl_Concatenate cat("blob concatenate", p);
+    Pl_Base64 base64("blob base64", &cat, Pl_Base64::a_encode);
+    fn(&base64);
+    base64.finish();
+    *p << "\"";
+}
+
 void
 JSON::write(Pipeline* p, size_t depth) const
 {
@@ -306,6 +324,12 @@ JSON::makeNull()
     return JSON(std::make_shared<JSON_null>());
 }
 
+JSON
+JSON::makeBlob(std::function<void(Pipeline*)> fn)
+{
+    return JSON(std::make_shared<JSON_blob>(fn));
+}
+
 bool
 JSON::isArray() const
 {
-- 
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