Make (and verify) public/ files compile under C.

fpdfsdk/src/fpdfview_c_api_test.c

Index: fpdfsdk/src/fpdfview_c_api_test.c
diff --git a/fpdfsdk/src/fpdfview_c_api_test.c b/fpdfsdk/src/fpdfview_c_api_test.c
new file mode 100644
index 0000000000000000000000000000000000000000..3fd682d394e715ebc5e3ec946075a5a5c9e60453
--- /dev/null
+++ b/fpdfsdk/src/fpdfview_c_api_test.c
@@ -0,0 +1,213 @@
+// Copyright 2015 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.
+
+// This "C" (not "C++") file ensures that the public headers compile
+// and link for "C" (and not just "C++").
+
+#include <stdio.h>
+
+#include "fpdfview_c_api_test.h"
+
+#include "../../public/fpdf_dataavail.h"
+#include "../../public/fpdf_doc.h"
+#include "../../public/fpdf_edit.h"
+#include "../../public/fpdf_ext.h"
+#include "../../public/fpdf_flatten.h"
+#include "../../public/fpdf_formfill.h"
+#include "../../public/fpdf_fwlevent.h"
+#include "../../public/fpdf_ppo.h"
+#include "../../public/fpdf_progressive.h"
+#include "../../public/fpdf_save.h"
+#include "../../public/fpdf_searchex.h"
+#include "../../public/fpdf_sysfontinfo.h"
+#include "../../public/fpdf_text.h"
+#include "../../public/fpdf_transformpage.h"
+#include "../../public/fpdfview.h"
+
+// Scheme for avoiding LTO out of existence, warnings, etc.
+typedef void (*fnptr)(void);  // Legal generic function type for casts.
+fnptr g_c_api_test_fnptr = NULL;  // Extern, so can't know it doesn't change.
+#define CHK(x) if ((fnptr)(x) == g_c_api_test_fnptr) return 0
+
+// Function to call from gtest harness to ensure linker resolution.
+int CheckPDFiumCApi() {
+    // fpdf_dataavail.h
+    CHK(FPDFAvail_Create);
+    CHK(FPDFAvail_Destroy);
+    CHK(FPDFAvail_IsDocAvail);
+    CHK(FPDFAvail_GetDocument);
+    CHK(FPDFAvail_GetFirstPageNum);
+    CHK(FPDFAvail_IsPageAvail);
+    CHK(FPDFAvail_IsFormAvail);
+    CHK(FPDFAvail_IsLinearized);
+
+    // fpdf_doc.h
+    CHK(FPDFBookmark_GetFirstChild);
+    CHK(FPDFBookmark_GetNextSibling);
+    CHK(FPDFBookmark_GetTitle);
+    CHK(FPDFBookmark_Find);
+    CHK(FPDFBookmark_GetDest);
+    CHK(FPDFBookmark_GetAction);
+    CHK(FPDFAction_GetType);
+    CHK(FPDFAction_GetDest);
+    CHK(FPDFAction_GetURIPath);
+    CHK(FPDFDest_GetPageIndex);
+    CHK(FPDFLink_GetLinkAtPoint);
+    CHK(FPDFLink_GetDest);
+    CHK(FPDFLink_GetAction);
+    CHK(FPDFLink_Enumerate);
+    CHK(FPDFLink_GetAnnotRect);
+    CHK(FPDFLink_CountQuadPoints);
+    CHK(FPDFLink_GetQuadPoints);
+    CHK(FPDF_GetMetaText);
+
+    // fpdf_edit.h
+    CHK(FPDF_CreateNewDocument);
+    CHK(FPDFPage_New);
+    CHK(FPDFPage_Delete);
+    CHK(FPDFPage_GetRotation);
+    CHK(FPDFPage_SetRotation);
+    CHK(FPDFPage_InsertObject);
+    CHK(FPDFPage_CountObject);
+    CHK(FPDFPage_GetObject);
+    CHK(FPDFPage_HasTransparency);
+    CHK(FPDFPage_GenerateContent);
+    CHK(FPDFPageObj_HasTransparency);
+    CHK(FPDFPageObj_Transform);
+    CHK(FPDFPage_TransformAnnots);
+    CHK(FPDFPageObj_NewImgeObj);
+    CHK(FPDFImageObj_LoadJpegFile);
+    CHK(FPDFImageObj_SetMatrix);
+    CHK(FPDFImageObj_SetBitmap);
+
+    // fpdf_ext.h
+    CHK(FSDK_SetUnSpObjProcessHandler);
+    CHK(FPDFDoc_GetPageMode);
+
+    // fpdf_flatten.h
+    CHK(FPDFPage_Flatten);
+
+    // fpdf_fwlevent.h - no exports.
+
+    // fpdf_formfill.h
+    CHK(FPDFDOC_InitFormFillEnvironment);
+    CHK(FPDFDOC_ExitFormFillEnvironment);
+    CHK(FORM_OnAfterLoadPage);
+    CHK(FORM_OnBeforeClosePage);
+    CHK(FORM_DoDocumentJSAction);
+    CHK(FORM_DoDocumentOpenAction);
+    CHK(FORM_DoDocumentAAction);
+    CHK(FORM_DoPageAAction);
+    CHK(FORM_OnMouseMove);
+    CHK(FORM_OnLButtonDown);
+    CHK(FORM_OnLButtonUp);
+    CHK(FORM_OnKeyDown);
+    CHK(FORM_OnKeyUp);
+    CHK(FORM_OnChar);
+    CHK(FORM_ForceToKillFocus);
+    CHK(FPDPage_HasFormFieldAtPoint);
+    CHK(FPDF_SetFormFieldHighlightColor);
+    CHK(FPDF_SetFormFieldHighlightAlpha);
+    CHK(FPDF_RemoveFormFieldHighlight);
+    CHK(FPDF_FFLDraw);
+
+    // fpdf_ppo.h
+    CHK(FPDF_ImportPages);
+    CHK(FPDF_CopyViewerPreferences);
+
+    // fpdf_progressive.h
+    CHK(FPDF_RenderPageBitmap_Start);
+    CHK(FPDF_RenderPage_Continue);
+    CHK(FPDF_RenderPage_Close);
+
+    // fpdf_save.h
+    CHK(FPDF_SaveAsCopy);
+    CHK(FPDF_SaveWithVersion);
+
+    // fpdf_searchex.h
+    CHK(FPDFText_GetCharIndexFromTextIndex);
+
+    // fpdf_sysfontinfo.h
+    CHK(FPDF_GetDefaultTTFMap);
+    CHK(FPDF_AddInstalledFont);
+    CHK(FPDF_SetSystemFontInfo);
+    CHK(FPDF_GetDefaultSystemFontInfo);
+
+    // fpdf_text.h
+    CHK(FPDFText_LoadPage);
+    CHK(FPDFText_ClosePage);
+    CHK(FPDFText_CountChars);
+    CHK(FPDFText_GetUnicode);
+    CHK(FPDFText_GetFontSize);
+    CHK(FPDFText_GetCharBox);
+    CHK(FPDFText_GetCharIndexAtPos);
+    CHK(FPDFText_GetText);
+    CHK(FPDFText_CountRects);
+    CHK(FPDFText_GetRect);
+    CHK(FPDFText_GetBoundedText);
+    CHK(FPDFText_FindStart);
+    CHK(FPDFText_FindNext);
+    CHK(FPDFText_FindPrev);
+    CHK(FPDFText_GetSchResultIndex);
+    CHK(FPDFText_GetSchCount);
+    CHK(FPDFText_FindClose);
+    CHK(FPDFLink_LoadWebLinks);
+    CHK(FPDFLink_CountWebLinks);
+    CHK(FPDFLink_GetURL);
+    CHK(FPDFLink_CountRects);
+    CHK(FPDFLink_GetRect);
+    CHK(FPDFLink_CloseWebLinks);
+
+    // fpdf_transformpage.h
+    CHK(FPDFPage_SetMediaBox);
+    CHK(FPDFPage_SetCropBox);
+    CHK(FPDFPage_GetMediaBox);
+    CHK(FPDFPage_GetCropBox);
+    CHK(FPDFPage_TransFormWithClip);
+    CHK(FPDFPageObj_TransformClipPath);
+    CHK(FPDF_CreateClipPath);
+    CHK(FPDF_DestroyClipPath);
+    CHK(FPDFPage_InsertClipPath);
+
+    // fpdfview.h
+    CHK(FPDF_InitLibrary);
+    CHK(FPDF_DestroyLibrary);
+    CHK(FPDF_SetSandBoxPolicy);
+    CHK(FPDF_LoadDocument);
+    CHK(FPDF_LoadMemDocument);
+    CHK(FPDF_LoadCustomDocument);
+    CHK(FPDF_GetFileVersion);
+    CHK(FPDF_GetLastError);
+    CHK(FPDF_GetDocPermissions);
+    CHK(FPDF_GetSecurityHandlerRevision);
+    CHK(FPDF_GetPageCount);
+    CHK(FPDF_LoadPage);
+    CHK(FPDF_GetPageWidth);
+    CHK(FPDF_GetPageHeight);
+    CHK(FPDF_GetPageSizeByIndex);
+    CHK(FPDF_RenderPageBitmap);
+    CHK(FPDF_ClosePage);
+    CHK(FPDF_CloseDocument);
+    CHK(FPDF_DeviceToPage);
+    CHK(FPDF_PageToDevice);
+    CHK(FPDFBitmap_Create);
+    CHK(FPDFBitmap_CreateEx);
+    CHK(FPDFBitmap_FillRect);
+    CHK(FPDFBitmap_GetBuffer);
+    CHK(FPDFBitmap_GetWidth);
+    CHK(FPDFBitmap_GetHeight);
+    CHK(FPDFBitmap_GetStride);
+    CHK(FPDFBitmap_Destroy);
+    CHK(FPDF_VIEWERREF_GetPrintScaling);
+    CHK(FPDF_VIEWERREF_GetNumCopies);
+    CHK(FPDF_VIEWERREF_GetPrintPageRange);
+    CHK(FPDF_VIEWERREF_GetDuplex);
+    CHK(FPDF_CountNamedDests);
+    CHK(FPDF_GetNamedDestByName);
+    CHK(FPDF_GetNamedDest);
+
+    return 1;
+}
+
+#undef CHK