PDF: Use FPDFAction_GetFilePath() to handle launch actions.

pdf/pdfium/pdfium_page.cc

Index: pdf/pdfium/pdfium_page.cc
diff --git a/pdf/pdfium/pdfium_page.cc b/pdf/pdfium/pdfium_page.cc
index 01a5fb6ad1a3ff5f54749d6beb49ad30940c5aa1..48d0f5c9fa3e26bbf58f729fa0211a73685c233b 100644
--- a/pdf/pdfium/pdfium_page.cc
+++ b/pdf/pdfium/pdfium_page.cc
@@ -336,8 +336,9 @@ PDFiumPage::Area PDFiumPage::GetLinkTarget(FPDF_LINK link,
     }
     case PDFACTION_URI:
       return GetURITarget(action, target);
-    // TODO(thestig): Support remaining types for https://crbug.com/55776
     case PDFACTION_LAUNCH:
+      return GetLaunchTarget(action, target);
+    // TODO(thestig): Support remaining types for https://crbug.com/55776
     case PDFACTION_REMOTEGOTO:
     default:
       return NONSELECTABLE_AREA;
@@ -368,6 +369,22 @@ PDFiumPage::Area PDFiumPage::GetURITarget(FPDF_ACTION uri_action,
   return WEBLINK_AREA;
 }
 
+PDFiumPage::Area PDFiumPage::GetLaunchTarget(FPDF_ACTION launch_action,
+                                             LinkTarget* target) const {
+  if (target) {
+    size_t buffer_size = FPDFAction_GetFilePath(launch_action, nullptr, 0);
+    if (buffer_size > 0) {
+      PDFiumAPIStringBufferAdapter<std::string> api_string_adapter(
+          &target->url, buffer_size, true);
+      void* data = api_string_adapter.GetData();
+      size_t bytes_written =
+          FPDFAction_GetFilePath(launch_action, data, buffer_size);
+      api_string_adapter.Close(bytes_written);
+    }
+  }
+  return WEBLINK_AREA;
+}
+
 int PDFiumPage::GetLink(int char_index, LinkTarget* target) {
   if (!available_)
     return -1;