Embedder tests can write saved PDFs to a file for debugging.

Before calling a method that use EmbedderTest as FPDF_FILEWRITE
(usually calling FPDF_SaveAsCopy()), call:

  OpenPDFFileForWrite("Filename.pdf");

After the write, close the stream with:

  ClosePDFFileForWrite();

Change-Id: Id1e7f778a9ff2b2b5bf976d49b485d5cb15f94bd
Reviewed-on: https://pdfium-review.googlesource.com/34150
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Henrique Nakashima <hnakashima@chromium.org>

1 files changed, 13 insertions, 0 deletions

diff --git a/testing/embedder_test.cpp b/testing/embedder_test.cpp
index 03eebe3abc..e4ac4ad2c7 100644
--- a/testing/embedder_test.cpp
+++ b/testing/embedder_test.cpp
@@ -546,7 +546,12 @@ int EmbedderTest::WriteBlockCallback(FPDF_FILEWRITE* pFileWrite,
                                      const void* data,
                                      unsigned long size) {
   EmbedderTest* pThis = static_cast<EmbedderTest*>(pFileWrite);
+
   pThis->data_string_.append(static_cast<const char*>(data), size);
+
+  if (pThis->filestream_.is_open())
+    pThis->filestream_.write(static_cast<const char*>(data), size);
+
   return 1;
 }
 
@@ -587,3 +592,11 @@ int EmbedderTest::GetPageNumberForLoadedPage(FPDF_PAGE page) const {
 int EmbedderTest::GetPageNumberForSavedPage(FPDF_PAGE page) const {
   return GetPageNumberForPage(saved_page_map_, page);
 }
+
+void EmbedderTest::OpenPDFFileForWrite(const char* filename) {
+  filestream_.open(filename, std::ios_base::binary);
+}
+
+void EmbedderTest::ClosePDFFileForWrite() {
+  filestream_.close();
+}