Basic APIs and test for retrieving embedded attachment count and name

1. Added APIs for retrieving embedded attachment count and file name.
    * Added an embedder test testing them.

Bug=pdfium:174

Change-Id: I181b8e0b81495d8a7fd8c3f79dbbc0f907f5e3fd
Reviewed-on: https://pdfium-review.googlesource.com/7490
Commit-Queue: Jane Liu <janeliulwq@google.com>
Reviewed-by: dsinclair <dsinclair@chromium.org>

1 files changed, 47 insertions, 0 deletions

diff --git a/fpdfsdk/fpdfattachment.cpp b/fpdfsdk/fpdfattachment.cpp
new file mode 100644
index 0000000000..d8713bb2e1
--- /dev/null
+++ b/fpdfsdk/fpdfattachment.cpp
@@ -0,0 +1,47 @@
+// Copyright 2017 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 "public/fpdf_attachment.h"
+
+#include "core/fpdfapi/parser/cpdf_document.h"
+#include "core/fpdfdoc/cpdf_filespec.h"
+#include "core/fpdfdoc/cpdf_nametree.h"
+#include "fpdfsdk/fsdk_define.h"
+
+DLLEXPORT int STDCALL FPDFDoc_GetAttachmentCount(FPDF_DOCUMENT document) {
+  CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
+  if (!pDoc)
+    return 0;
+
+  return CPDF_NameTree(pDoc, "EmbeddedFiles").GetCount();
+}
+
+DLLEXPORT unsigned long STDCALL
+FPDFDoc_GetAttachmentName(FPDF_DOCUMENT document,
+                          int index,
+                          void* buffer,
+                          unsigned long buflen) {
+  CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
+  if (!pDoc || index < 0)
+    return 0;
+
+  CPDF_NameTree nameTree(pDoc, "EmbeddedFiles");
+  if (static_cast<size_t>(index) >= nameTree.GetCount())
+    return 0;
+
+  CFX_ByteString csName;
+  CPDF_Object* pFile = nameTree.LookupValueAndName(index, &csName);
+  if (!pFile)
+    return 0;
+
+  CFX_WideString name;
+  CPDF_FileSpec filespec(pFile);
+  filespec.GetFileName(&name);
+  CFX_ByteString encodedName = name.UTF16LE_Encode();
+  unsigned long len = encodedName.GetLength();
+  if (buffer && buflen >= len)
+    memcpy(buffer, encodedName.c_str(), len);
+
+  return len;
+}