Write marked content operators when generating a stream.

The marked content operators are BMC, BDC and EMC. In the case of
BDC, it is preceded by a direct dict or a property name.

Bug: pdfium:1118
Change-Id: I3ee736ff7be3e7d7dde55ef581af3444a325e887
Reviewed-on: https://pdfium-review.googlesource.com/37470
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Henrique Nakashima <hnakashima@chromium.org>

1 files changed, 35 insertions, 0 deletions

diff --git a/core/fpdfapi/edit/cpdf_stringarchivestream.cpp b/core/fpdfapi/edit/cpdf_stringarchivestream.cpp
new file mode 100644
index 0000000000..328d6a217e
--- /dev/null
+++ b/core/fpdfapi/edit/cpdf_stringarchivestream.cpp
@@ -0,0 +1,35 @@
+// Copyright 2018 PDFium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "core/fpdfapi/edit/cpdf_stringarchivestream.h"
+
+CPDF_StringArchiveStream::CPDF_StringArchiveStream(std::ostringstream* stream)
+    : stream_(stream) {}
+
+CPDF_StringArchiveStream::~CPDF_StringArchiveStream() {}
+
+bool CPDF_StringArchiveStream::WriteByte(uint8_t byte) {
+  NOTREACHED();
+  return false;
+}
+
+bool CPDF_StringArchiveStream::WriteDWord(uint32_t i) {
+  NOTREACHED();
+  return false;
+}
+
+FX_FILESIZE CPDF_StringArchiveStream::CurrentOffset() const {
+  NOTREACHED();
+  return false;
+}
+
+bool CPDF_StringArchiveStream::WriteBlock(const void* pData, size_t size) {
+  stream_->write(static_cast<const char*>(pData), size);
+  return true;
+}
+
+bool CPDF_StringArchiveStream::WriteString(const ByteStringView& str) {
+  stream_->write(str.unterminated_c_str(), str.GetLength());
+  return true;
+}