Merge to XFA: Implement FPDFAction_GetFilePath().

The API is the same as the Foxit version, except the encoding is
specified as UTF-8 instead of local encoding.

Also remove CPDF_LWinParam since it's unused.

BUG=chromium:517713
R=tsepez@chromium.org

Review URL: https://codereview.chromium.org/1335373002 .

(cherry picked from commit 0b3c8f742613da294f812e2f6e908f4026499f96)
(cherry picked from commit a9d4bc541179ec0436adc4b2e18b7fdecc5952dc)
(cherry picked from commit 4ffd89ed556e32a6527d0e88952fe20ec1e2f362)

Review URL: https://codereview.chromium.org/1345953002 .

3 files changed, 56 insertions, 19 deletions

diff --git a/fpdfsdk/src/fpdfdoc.cpp b/fpdfsdk/src/fpdfdoc.cpp
index 47225dd2b1..34caf95b52 100644
--- a/fpdfsdk/src/fpdfdoc.cpp
+++ b/fpdfsdk/src/fpdfdoc.cpp
@@ -128,7 +128,8 @@ DLLEXPORT FPDF_ACTION STDCALL FPDFBookmark_GetAction(FPDF_BOOKMARK pDict) {
 
 DLLEXPORT unsigned long STDCALL FPDFAction_GetType(FPDF_ACTION pDict) {
   if (!pDict)
-    return 0;
+    return PDFACTION_UNSUPPORTED;
+
   CPDF_Action action((CPDF_Dictionary*)pDict);
   CPDF_Action::ActionType type = action.GetType();
   switch (type) {
@@ -143,43 +144,53 @@ DLLEXPORT unsigned long STDCALL FPDFAction_GetType(FPDF_ACTION pDict) {
     default:
       return PDFACTION_UNSUPPORTED;
   }
-  return PDFACTION_UNSUPPORTED;
 }
 
 DLLEXPORT FPDF_DEST STDCALL FPDFAction_GetDest(FPDF_DOCUMENT document,
                                                FPDF_ACTION pDict) {
-  if (!document)
-    return NULL;
-  if (!pDict)
-    return NULL;
+  if (!document || !pDict)
+    return nullptr;
+
   CPDF_Document* pDoc = ((CPDFXFA_Document*)document)->GetPDFDoc();
   CPDF_Action action((CPDF_Dictionary*)pDict);
   return action.GetDest(pDoc).GetObject();
 }
 
+DLLEXPORT unsigned long STDCALL
+FPDFAction_GetFilePath(FPDF_ACTION pDict, void* buffer, unsigned long buflen) {
+  unsigned long type = FPDFAction_GetType(pDict);
+  if (type != PDFACTION_REMOTEGOTO && type != PDFACTION_LAUNCH)
+    return 0;
+
+  CPDF_Action action((CPDF_Dictionary*)pDict);
+  CFX_ByteString path = action.GetFilePath().UTF8Encode();
+  unsigned long len = path.GetLength() + 1;
+  if (buffer && buflen >= len)
+    FXSYS_memcpy(buffer, path.c_str(), len);
+  return len;
+}
+
 DLLEXPORT unsigned long STDCALL FPDFAction_GetURIPath(FPDF_DOCUMENT document,
                                                       FPDF_ACTION pDict,
                                                       void* buffer,
                                                       unsigned long buflen) {
-  if (!document)
-    return 0;
-  if (!pDict)
+  if (!document || !pDict)
     return 0;
+
   CPDF_Document* pDoc = ((CPDFXFA_Document*)document)->GetPDFDoc();
   CPDF_Action action((CPDF_Dictionary*)pDict);
   CFX_ByteString path = action.GetURI(pDoc);
   unsigned long len = path.GetLength() + 1;
-  if (buffer != NULL && buflen >= len)
+  if (buffer && buflen >= len)
     FXSYS_memcpy(buffer, path.c_str(), len);
   return len;
 }
 
 DLLEXPORT unsigned long STDCALL FPDFDest_GetPageIndex(FPDF_DOCUMENT document,
                                                       FPDF_DEST pDict) {
-  if (!document)
-    return 0;
-  if (!pDict)
+  if (!document || !pDict)
     return 0;
+
   CPDF_Document* pDoc = ((CPDFXFA_Document*)document)->GetPDFDoc();
   CPDF_Dest dest((CPDF_Array*)pDict);
   return dest.GetPageIndex(pDoc);
@@ -218,10 +229,9 @@ FPDFLink_GetLinkZOrderAtPoint(FPDF_PAGE page, double x, double y) {
 
 DLLEXPORT FPDF_DEST STDCALL FPDFLink_GetDest(FPDF_DOCUMENT document,
                                              FPDF_LINK pDict) {
-  if (!document)
-    return NULL;
-  if (!pDict)
-    return NULL;
+  if (!document || !pDict)
+    return nullptr;
+
   CPDF_Document* pDoc = ((CPDFXFA_Document*)document)->GetPDFDoc();
   CPDF_Link link((CPDF_Dictionary*)pDict);
   FPDF_DEST dest = link.GetDest(pDoc).GetObject();
@@ -230,13 +240,14 @@ DLLEXPORT FPDF_DEST STDCALL FPDFLink_GetDest(FPDF_DOCUMENT document,
   // If this link is not directly associated with a dest, we try to get action
   CPDF_Action action = link.GetAction();
   if (!action)
-    return NULL;
+    return nullptr;
   return action.GetDest(pDoc).GetObject();
 }
 
 DLLEXPORT FPDF_ACTION STDCALL FPDFLink_GetAction(FPDF_LINK pDict) {
   if (!pDict)
-    return NULL;
+    return nullptr;
+
   CPDF_Link link((CPDF_Dictionary*)pDict);
   return link.GetAction().GetDict();
 }
diff --git a/fpdfsdk/src/fpdfdoc_embeddertest.cpp b/fpdfsdk/src/fpdfdoc_embeddertest.cpp
index b263fafe16..8b1c4fb3e8 100644
--- a/fpdfsdk/src/fpdfdoc_embeddertest.cpp
+++ b/fpdfsdk/src/fpdfdoc_embeddertest.cpp
@@ -35,3 +35,28 @@ TEST_F(FPDFDocEmbeddertest, DestGetPageIndex) {
   EXPECT_NE(nullptr, dest);
   EXPECT_EQ(0U, FPDFDest_GetPageIndex(document(), dest));
 }
+
+TEST_F(FPDFDocEmbeddertest, ActionGetFilePath) {
+  EXPECT_TRUE(OpenDocument("testing/resources/launch_action.pdf"));
+
+  FPDF_PAGE page = FPDF_LoadPage(document(), 0);
+  ASSERT_TRUE(page);
+
+  // The target action is nearly the size of the whole page.
+  FPDF_LINK link = FPDFLink_GetLinkAtPoint(page, 100, 100);
+  ASSERT_TRUE(link);
+
+  FPDF_ACTION action = FPDFLink_GetAction(link);
+  ASSERT_TRUE(action);
+
+  const char kExpectedResult[] = "test.pdf";
+  const unsigned long kExpectedLength = sizeof(kExpectedResult);
+  unsigned long bufsize = FPDFAction_GetFilePath(action, nullptr, 0);
+  ASSERT_EQ(kExpectedLength, bufsize);
+
+  char buf[kExpectedLength];
+  EXPECT_EQ(bufsize, FPDFAction_GetFilePath(action, buf, bufsize));
+  EXPECT_EQ(std::string(kExpectedResult), std::string(buf));
+
+  FPDF_ClosePage(page);
+}
diff --git a/fpdfsdk/src/fpdfview_c_api_test.c b/fpdfsdk/src/fpdfview_c_api_test.c
index 01789b4432..d16bf99f07 100644
--- a/fpdfsdk/src/fpdfview_c_api_test.c
+++ b/fpdfsdk/src/fpdfview_c_api_test.c
@@ -51,6 +51,7 @@ int CheckPDFiumCApi() {
     CHK(FPDFBookmark_GetAction);
     CHK(FPDFAction_GetType);
     CHK(FPDFAction_GetDest);
+    CHK(FPDFAction_GetFilePath);
     CHK(FPDFAction_GetURIPath);
     CHK(FPDFDest_GetPageIndex);
     CHK(FPDFLink_GetLinkAtPoint);