Basic APIs and tests for extracting attachments

1. Added API for extracting attachment properties and data.
  * Expanded the embedder test to cover all the new APIs.

Bug=pdfium:174

Change-Id: I09bffd412410e9aea45faca442d2b72eefafef4e
Reviewed-on: https://pdfium-review.googlesource.com/7790
Reviewed-by: dsinclair <dsinclair@chromium.org>
Commit-Queue: dsinclair <dsinclair@chromium.org>

1 files changed, 20 insertions, 0 deletions

diff --git a/fpdfsdk/fpdfview.cpp b/fpdfsdk/fpdfview.cpp
index 2e52ad6487..06e72b3a71 100644
--- a/fpdfsdk/fpdfview.cpp
+++ b/fpdfsdk/fpdfview.cpp
@@ -320,10 +320,30 @@ CPDF_PageObject* CPDFPageObjectFromFPDFPageObject(FPDF_PAGEOBJECT page_object) {
   return static_cast<CPDF_PageObject*>(page_object);
 }
 
+CPDF_Object* CPDFObjectFromFPDFAttachment(FPDF_ATTACHMENT attachment) {
+  return static_cast<CPDF_Object*>(attachment);
+}
+
+CFX_ByteString CFXByteStringFromFPDFWideString(FPDF_WIDESTRING wide_string) {
+  return CFX_WideString::FromUTF16LE(wide_string,
+                                     CFX_WideString::WStringLength(wide_string))
+      .UTF8Encode();
+}
+
 CFX_DIBitmap* CFXBitmapFromFPDFBitmap(FPDF_BITMAP bitmap) {
   return static_cast<CFX_DIBitmap*>(bitmap);
 }
 
+unsigned long Utf16EncodeMaybeCopyAndReturnLength(const CFX_WideString& text,
+                                                  void* buffer,
+                                                  unsigned long buflen) {
+  CFX_ByteString encodedText = text.UTF16LE_Encode();
+  unsigned long len = encodedText.GetLength();
+  if (buffer && len <= buflen)
+    memcpy(buffer, encodedText.c_str(), len);
+  return len;
+}
+
 CFX_RetainPtr<IFX_SeekableReadStream> MakeSeekableReadStream(
     FPDF_FILEACCESS* pFileAccess) {
   return pdfium::MakeRetain<CPDF_CustomAccess>(pFileAccess);