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// Copyright 2014 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.
// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
#include "public/fpdfview.h"
#include <memory>
#include <utility>
#include <vector>
#include "build/build_config.h"
#include "core/fpdfapi/page/cpdf_docpagedata.h"
#include "core/fpdfapi/page/cpdf_occontext.h"
#include "core/fpdfapi/page/cpdf_page.h"
#include "core/fpdfapi/page/cpdf_pagemodule.h"
#include "core/fpdfapi/parser/cpdf_array.h"
#include "core/fpdfapi/parser/cpdf_dictionary.h"
#include "core/fpdfapi/parser/cpdf_document.h"
#include "core/fpdfapi/parser/cpdf_name.h"
#include "core/fpdfapi/parser/cpdf_parser.h"
#include "core/fpdfapi/parser/cpdf_stream.h"
#include "core/fpdfapi/parser/cpdf_string.h"
#include "core/fpdfapi/parser/cpdf_syntax_parser.h"
#include "core/fpdfapi/parser/fpdf_parser_decode.h"
#include "core/fpdfapi/render/cpdf_docrenderdata.h"
#include "core/fpdfapi/render/cpdf_pagerendercache.h"
#include "core/fpdfapi/render/cpdf_pagerendercontext.h"
#include "core/fpdfapi/render/cpdf_rendercontext.h"
#include "core/fpdfapi/render/cpdf_renderoptions.h"
#include "core/fpdfdoc/cpdf_nametree.h"
#include "core/fpdfdoc/cpdf_viewerpreferences.h"
#include "core/fxcrt/cfx_readonlymemorystream.h"
#include "core/fxcrt/fx_safe_types.h"
#include "core/fxcrt/fx_stream.h"
#include "core/fxcrt/fx_system.h"
#include "core/fxcrt/stl_util.h"
#include "core/fxcrt/unowned_ptr.h"
#include "core/fxge/cfx_defaultrenderdevice.h"
#include "core/fxge/cfx_gemodule.h"
#include "core/fxge/cfx_renderdevice.h"
#include "fpdfsdk/cpdfsdk_customaccess.h"
#include "fpdfsdk/cpdfsdk_formfillenvironment.h"
#include "fpdfsdk/cpdfsdk_helpers.h"
#include "fpdfsdk/cpdfsdk_pageview.h"
#include "fpdfsdk/cpdfsdk_renderpage.h"
#include "fxjs/ijs_runtime.h"
#include "public/fpdf_formfill.h"
#include "third_party/base/numerics/safe_conversions.h"
#include "third_party/base/ptr_util.h"
#include "third_party/base/span.h"
#ifdef PDF_ENABLE_V8
#include "fxjs/cfx_v8_array_buffer_allocator.h"
#include "third_party/base/no_destructor.h"
#endif
#ifdef PDF_ENABLE_XFA
#include "fpdfsdk/fpdfxfa/cpdfxfa_context.h"
#include "fpdfsdk/fpdfxfa/cpdfxfa_page.h"
#endif // PDF_ENABLE_XFA
#if BUILDFLAG(IS_WIN)
#include "core/fpdfapi/render/cpdf_progressiverenderer.h"
#include "core/fpdfapi/render/cpdf_windowsrenderdevice.h"
#include "public/fpdf_edit.h"
// These checks are here because core/ and public/ cannot depend on each other.
static_assert(static_cast<int>(WindowsPrintMode::kEmf) == FPDF_PRINTMODE_EMF,
"WindowsPrintMode::kEmf value mismatch");
static_assert(static_cast<int>(WindowsPrintMode::kTextOnly) ==
FPDF_PRINTMODE_TEXTONLY,
"WindowsPrintMode::kTextOnly value mismatch");
static_assert(static_cast<int>(WindowsPrintMode::kPostScript2) ==
FPDF_PRINTMODE_POSTSCRIPT2,
"WindowsPrintMode::kPostScript2 value mismatch");
static_assert(static_cast<int>(WindowsPrintMode::kPostScript3) ==
FPDF_PRINTMODE_POSTSCRIPT3,
"WindowsPrintMode::kPostScript3 value mismatch");
static_assert(static_cast<int>(WindowsPrintMode::kPostScript2PassThrough) ==
FPDF_PRINTMODE_POSTSCRIPT2_PASSTHROUGH,
"WindowsPrintMode::kPostScript2PassThrough value mismatch");
static_assert(static_cast<int>(WindowsPrintMode::kPostScript3PassThrough) ==
FPDF_PRINTMODE_POSTSCRIPT3_PASSTHROUGH,
"WindowsPrintMode::kPostScript3PassThrough value mismatch");
static_assert(static_cast<int>(WindowsPrintMode::kEmfImageMasks) ==
FPDF_PRINTMODE_EMF_IMAGE_MASKS,
"WindowsPrintMode::kEmfImageMasks value mismatch");
static_assert(static_cast<int>(WindowsPrintMode::kPostScript3Type42) ==
FPDF_PRINTMODE_POSTSCRIPT3_TYPE42,
"WindowsPrintMode::kPostScript3Type42 value mismatch");
static_assert(
static_cast<int>(WindowsPrintMode::kPostScript3Type42PassThrough) ==
FPDF_PRINTMODE_POSTSCRIPT3_TYPE42_PASSTHROUGH,
"WindowsPrintMode::kPostScript3Type42PassThrough value mismatch");
#endif // BUILDFLAG(IS_WIN)
namespace {
bool g_bLibraryInitialized = false;
const CPDF_Object* GetXFAEntryFromDocument(const CPDF_Document* doc) {
const CPDF_Dictionary* root = doc->GetRoot();
if (!root)
return nullptr;
const CPDF_Dictionary* acro_form = root->GetDictFor("AcroForm");
return acro_form ? acro_form->GetObjectFor("XFA") : nullptr;
}
struct XFAPacket {
ByteString name;
const CPDF_Stream* data;
};
std::vector<XFAPacket> GetXFAPackets(const CPDF_Object* xfa_object) {
std::vector<XFAPacket> packets;
if (!xfa_object)
return packets;
const CPDF_Stream* xfa_stream = ToStream(xfa_object->GetDirect());
if (xfa_stream) {
packets.push_back({"", xfa_stream});
return packets;
}
const CPDF_Array* xfa_array = ToArray(xfa_object->GetDirect());
if (!xfa_array)
return packets;
packets.reserve(1 + (xfa_array->size() / 2));
for (size_t i = 0; i < xfa_array->size(); i += 2) {
if (i + 1 == xfa_array->size())
break;
const CPDF_String* name = ToString(xfa_array->GetObjectAt(i));
if (!name)
continue;
const CPDF_Stream* data = xfa_array->GetStreamAt(i + 1);
if (!data)
continue;
packets.push_back({name->GetString(), data});
}
return packets;
}
FPDF_DOCUMENT LoadDocumentImpl(
const RetainPtr<IFX_SeekableReadStream>& pFileAccess,
FPDF_BYTESTRING password) {
if (!pFileAccess) {
ProcessParseError(CPDF_Parser::FILE_ERROR);
return nullptr;
}
auto pDocument =
std::make_unique<CPDF_Document>(std::make_unique<CPDF_DocRenderData>(),
std::make_unique<CPDF_DocPageData>());
CPDF_Parser::Error error = pDocument->LoadDoc(pFileAccess, password);
if (error != CPDF_Parser::SUCCESS) {
ProcessParseError(error);
return nullptr;
}
ReportUnsupportedFeatures(pDocument.get());
return FPDFDocumentFromCPDFDocument(pDocument.release());
}
} // namespace
FPDF_EXPORT void FPDF_CALLCONV FPDF_InitLibrary() {
FPDF_InitLibraryWithConfig(nullptr);
}
FPDF_EXPORT void FPDF_CALLCONV
FPDF_InitLibraryWithConfig(const FPDF_LIBRARY_CONFIG* config) {
if (g_bLibraryInitialized)
return;
FXMEM_InitializePartitionAlloc();
CFX_GEModule::Create(config ? config->m_pUserFontPaths : nullptr);
CPDF_PageModule::Create();
#ifdef PDF_ENABLE_XFA
CPDFXFA_ModuleInit();
#endif // PDF_ENABLE_XFA
if (config && config->version >= 2) {
void* platform = config->version >= 3 ? config->m_pPlatform : nullptr;
IJS_Runtime::Initialize(config->m_v8EmbedderSlot, config->m_pIsolate,
platform);
}
g_bLibraryInitialized = true;
}
FPDF_EXPORT void FPDF_CALLCONV FPDF_DestroyLibrary() {
if (!g_bLibraryInitialized)
return;
#ifdef PDF_ENABLE_XFA
CPDFXFA_ModuleDestroy();
#endif // PDF_ENABLE_XFA
CPDF_PageModule::Destroy();
CFX_GEModule::Destroy();
IJS_Runtime::Destroy();
g_bLibraryInitialized = false;
}
FPDF_EXPORT void FPDF_CALLCONV FPDF_SetSandBoxPolicy(FPDF_DWORD policy,
FPDF_BOOL enable) {
return SetPDFSandboxPolicy(policy, enable);
}
#if BUILDFLAG(IS_WIN)
FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV FPDF_SetPrintMode(int mode) {
if (mode < FPDF_PRINTMODE_EMF ||
mode > FPDF_PRINTMODE_POSTSCRIPT3_TYPE42_PASSTHROUGH) {
return FALSE;
}
g_pdfium_print_mode = static_cast<WindowsPrintMode>(mode);
return TRUE;
}
#endif // BUILDFLAG(IS_WIN)
FPDF_EXPORT FPDF_DOCUMENT FPDF_CALLCONV
FPDF_LoadDocument(FPDF_STRING file_path, FPDF_BYTESTRING password) {
// NOTE: the creation of the file needs to be by the embedder on the
// other side of this API.
return LoadDocumentImpl(IFX_SeekableReadStream::CreateFromFilename(file_path),
password);
}
FPDF_EXPORT int FPDF_CALLCONV FPDF_GetFormType(FPDF_DOCUMENT document) {
const CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
if (!pDoc)
return FORMTYPE_NONE;
const CPDF_Dictionary* pRoot = pDoc->GetRoot();
if (!pRoot)
return FORMTYPE_NONE;
const CPDF_Dictionary* pAcroForm = pRoot->GetDictFor("AcroForm");
if (!pAcroForm)
return FORMTYPE_NONE;
const CPDF_Object* pXFA = pAcroForm->GetObjectFor("XFA");
if (!pXFA)
return FORMTYPE_ACRO_FORM;
bool bNeedsRendering = pRoot->GetBooleanFor("NeedsRendering", false);
return bNeedsRendering ? FORMTYPE_XFA_FULL : FORMTYPE_XFA_FOREGROUND;
}
FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV FPDF_LoadXFA(FPDF_DOCUMENT document) {
#ifdef PDF_ENABLE_XFA
auto* pDoc = CPDFDocumentFromFPDFDocument(document);
if (!pDoc)
return false;
auto* pContext = static_cast<CPDFXFA_Context*>(pDoc->GetExtension());
if (pContext)
return pContext->LoadXFADoc();
#endif // PDF_ENABLE_XFA
return false;
}
FPDF_EXPORT FPDF_DOCUMENT FPDF_CALLCONV
FPDF_LoadMemDocument(const void* data_buf, int size, FPDF_BYTESTRING password) {
return LoadDocumentImpl(
pdfium::MakeRetain<CFX_ReadOnlyMemoryStream>(
pdfium::make_span(static_cast<const uint8_t*>(data_buf), size)),
password);
}
FPDF_EXPORT FPDF_DOCUMENT FPDF_CALLCONV
FPDF_LoadMemDocument64(const void* data_buf,
size_t size,
FPDF_BYTESTRING password) {
return LoadDocumentImpl(
pdfium::MakeRetain<CFX_ReadOnlyMemoryStream>(
pdfium::make_span(static_cast<const uint8_t*>(data_buf), size)),
password);
}
FPDF_EXPORT FPDF_DOCUMENT FPDF_CALLCONV
FPDF_LoadCustomDocument(FPDF_FILEACCESS* pFileAccess,
FPDF_BYTESTRING password) {
if (!pFileAccess)
return nullptr;
return LoadDocumentImpl(pdfium::MakeRetain<CPDFSDK_CustomAccess>(pFileAccess),
password);
}
FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV FPDF_GetFileVersion(FPDF_DOCUMENT doc,
int* fileVersion) {
if (!fileVersion)
return false;
*fileVersion = 0;
CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(doc);
if (!pDoc)
return false;
const CPDF_Parser* pParser = pDoc->GetParser();
if (!pParser)
return false;
*fileVersion = pParser->GetFileVersion();
return true;
}
FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV
FPDF_DocumentHasValidCrossReferenceTable(FPDF_DOCUMENT document) {
CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
return pDoc && pDoc->has_valid_cross_reference_table();
}
FPDF_EXPORT unsigned long FPDF_CALLCONV
FPDF_GetDocPermissions(FPDF_DOCUMENT document) {
CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
return pDoc ? pDoc->GetUserPermissions() : 0;
}
FPDF_EXPORT int FPDF_CALLCONV
FPDF_GetSecurityHandlerRevision(FPDF_DOCUMENT document) {
CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
if (!pDoc || !pDoc->GetParser())
return -1;
const CPDF_Dictionary* pDict = pDoc->GetParser()->GetEncryptDict();
return pDict ? pDict->GetIntegerFor("R") : -1;
}
FPDF_EXPORT int FPDF_CALLCONV FPDF_GetPageCount(FPDF_DOCUMENT document) {
auto* pDoc = CPDFDocumentFromFPDFDocument(document);
if (!pDoc)
return 0;
auto* pExtension = pDoc->GetExtension();
return pExtension ? pExtension->GetPageCount() : pDoc->GetPageCount();
}
FPDF_EXPORT FPDF_PAGE FPDF_CALLCONV FPDF_LoadPage(FPDF_DOCUMENT document,
int page_index) {
auto* pDoc = CPDFDocumentFromFPDFDocument(document);
if (!pDoc)
return nullptr;
if (page_index < 0 || page_index >= FPDF_GetPageCount(document))
return nullptr;
#ifdef PDF_ENABLE_XFA
auto* pContext = static_cast<CPDFXFA_Context*>(pDoc->GetExtension());
if (pContext) {
return FPDFPageFromIPDFPage(
pContext->GetOrCreateXFAPage(page_index).Leak());
}
#endif // PDF_ENABLE_XFA
CPDF_Dictionary* pDict = pDoc->GetPageDictionary(page_index);
if (!pDict)
return nullptr;
auto pPage = pdfium::MakeRetain<CPDF_Page>(pDoc, pDict);
pPage->SetRenderCache(std::make_unique<CPDF_PageRenderCache>(pPage.Get()));
pPage->ParseContent();
return FPDFPageFromIPDFPage(pPage.Leak());
}
FPDF_EXPORT float FPDF_CALLCONV FPDF_GetPageWidthF(FPDF_PAGE page) {
IPDF_Page* pPage = IPDFPageFromFPDFPage(page);
return pPage ? pPage->GetPageWidth() : 0.0f;
}
FPDF_EXPORT double FPDF_CALLCONV FPDF_GetPageWidth(FPDF_PAGE page) {
return FPDF_GetPageWidthF(page);
}
FPDF_EXPORT float FPDF_CALLCONV FPDF_GetPageHeightF(FPDF_PAGE page) {
IPDF_Page* pPage = IPDFPageFromFPDFPage(page);
return pPage ? pPage->GetPageHeight() : 0.0f;
}
FPDF_EXPORT double FPDF_CALLCONV FPDF_GetPageHeight(FPDF_PAGE page) {
return FPDF_GetPageHeightF(page);
}
FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV FPDF_GetPageBoundingBox(FPDF_PAGE page,
FS_RECTF* rect) {
if (!rect)
return false;
CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
if (!pPage)
return false;
*rect = FSRectFFromCFXFloatRect(pPage->GetBBox());
return true;
}
#if BUILDFLAG(IS_WIN)
namespace {
constexpr float kEpsilonSize = 0.01f;
bool IsPageTooSmall(const CPDF_Page* page) {
const CFX_SizeF& page_size = page->GetPageSize();
return page_size.width < kEpsilonSize || page_size.height < kEpsilonSize;
}
bool IsScalingTooSmall(const CFX_Matrix& matrix) {
float horizontal;
float vertical;
if (matrix.a == 0.0f && matrix.d == 0.0f) {
horizontal = matrix.b;
vertical = matrix.c;
} else {
horizontal = matrix.a;
vertical = matrix.d;
}
return fabsf(horizontal) < kEpsilonSize || fabsf(vertical) < kEpsilonSize;
}
// Get a bitmap of just the mask section defined by |mask_box| from a full page
// bitmap |pBitmap|.
RetainPtr<CFX_DIBitmap> GetMaskBitmap(CPDF_Page* pPage,
int start_x,
int start_y,
int size_x,
int size_y,
int rotate,
const RetainPtr<CFX_DIBitmap>& pSrc,
const CFX_FloatRect& mask_box,
FX_RECT* bitmap_area) {
if (IsPageTooSmall(pPage))
return nullptr;
FX_RECT page_rect(start_x, start_y, start_x + size_x, start_y + size_y);
CFX_Matrix matrix = pPage->GetDisplayMatrix(page_rect, rotate);
if (IsScalingTooSmall(matrix))
return nullptr;
*bitmap_area = matrix.TransformRect(mask_box).GetOuterRect();
if (bitmap_area->IsEmpty())
return nullptr;
// Create a new bitmap to transfer part of the page bitmap to.
RetainPtr<CFX_DIBitmap> pDst = pdfium::MakeRetain<CFX_DIBitmap>();
if (!pDst->Create(bitmap_area->Width(), bitmap_area->Height(),
FXDIB_Format::kArgb)) {
return nullptr;
}
pDst->Clear(0x00ffffff);
pDst->TransferBitmap(0, 0, bitmap_area->Width(), bitmap_area->Height(), pSrc,
bitmap_area->left, bitmap_area->top);
return pDst;
}
void RenderBitmap(CFX_RenderDevice* device,
const RetainPtr<CFX_DIBitmap>& pSrc,
const FX_RECT& mask_area) {
int size_x_bm = mask_area.Width();
int size_y_bm = mask_area.Height();
if (size_x_bm == 0 || size_y_bm == 0)
return;
// Create a new bitmap from the old one
RetainPtr<CFX_DIBitmap> pDst = pdfium::MakeRetain<CFX_DIBitmap>();
if (!pDst->Create(size_x_bm, size_y_bm, FXDIB_Format::kRgb32))
return;
pDst->Clear(0xffffffff);
pDst->CompositeBitmap(0, 0, size_x_bm, size_y_bm, pSrc, 0, 0,
BlendMode::kNormal, nullptr, false);
if (device->GetDeviceType() == DeviceType::kPrinter) {
device->StretchDIBits(pDst, mask_area.left, mask_area.top, size_x_bm,
size_y_bm);
} else {
device->SetDIBits(pDst, mask_area.left, mask_area.top);
}
}
} // namespace
FPDF_EXPORT void FPDF_CALLCONV FPDF_RenderPage(HDC dc,
FPDF_PAGE page,
int start_x,
int start_y,
int size_x,
int size_y,
int rotate,
int flags) {
CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
if (!pPage)
return;
auto pOwnedContext = std::make_unique<CPDF_PageRenderContext>();
CPDF_PageRenderContext* pContext = pOwnedContext.get();
CPDF_Page::RenderContextClearer clearer(pPage);
pPage->SetRenderContext(std::move(pOwnedContext));
// Don't render the full page to bitmap for a mask unless there are a lot
// of masks. Full page bitmaps result in large spool sizes, so they should
// only be used when necessary. For large numbers of masks, rendering each
// individually is inefficient and unlikely to significantly improve spool
// size.
const bool bEnableImageMasks =
g_pdfium_print_mode == WindowsPrintMode::kEmfImageMasks;
const bool bNewBitmap = pPage->BackgroundAlphaNeeded() ||
(pPage->HasImageMask() && !bEnableImageMasks) ||
pPage->GetMaskBoundingBoxes().size() > 100;
const bool bHasMask = pPage->HasImageMask() && !bNewBitmap;
auto* render_data = CPDF_DocRenderData::FromDocument(pPage->GetDocument());
if (!bNewBitmap && !bHasMask) {
pContext->m_pDevice = std::make_unique<CPDF_WindowsRenderDevice>(
dc, render_data->GetPSFontTracker());
CPDFSDK_RenderPageWithContext(pContext, pPage, start_x, start_y, size_x,
size_y, rotate, flags,
/*color_scheme=*/nullptr,
/*need_to_restore=*/true, /*pause=*/nullptr);
return;
}
RetainPtr<CFX_DIBitmap> pBitmap = pdfium::MakeRetain<CFX_DIBitmap>();
// Create will probably work fine even if it fails here: we will just attach
// a zero-sized bitmap to |pDevice|.
pBitmap->Create(size_x, size_y, FXDIB_Format::kArgb);
pBitmap->Clear(0x00ffffff);
CFX_DefaultRenderDevice* pDevice = new CFX_DefaultRenderDevice;
pContext->m_pDevice = pdfium::WrapUnique(pDevice);
pDevice->Attach(pBitmap, false, nullptr, false);
if (bHasMask) {
pContext->m_pOptions = std::make_unique<CPDF_RenderOptions>();
pContext->m_pOptions->GetOptions().bBreakForMasks = true;
}
CPDFSDK_RenderPageWithContext(pContext, pPage, start_x, start_y, size_x,
size_y, rotate, flags, /*color_scheme=*/nullptr,
/*need_to_restore=*/true,
/*pause=*/nullptr);
if (!bHasMask) {
CPDF_WindowsRenderDevice win_dc(dc, render_data->GetPSFontTracker());
bool bitsStretched = false;
if (win_dc.GetDeviceType() == DeviceType::kPrinter) {
auto pDst = pdfium::MakeRetain<CFX_DIBitmap>();
if (pDst->Create(size_x, size_y, FXDIB_Format::kRgb32)) {
memset(pDst->GetBuffer(), -1, pBitmap->GetPitch() * size_y);
pDst->CompositeBitmap(0, 0, size_x, size_y, pBitmap, 0, 0,
BlendMode::kNormal, nullptr, false);
win_dc.StretchDIBits(pDst, 0, 0, size_x, size_y);
bitsStretched = true;
}
}
if (!bitsStretched)
win_dc.SetDIBits(pBitmap, 0, 0);
return;
}
// Finish rendering the page to bitmap and copy the correct segments
// of the page to individual image mask bitmaps.
const std::vector<CFX_FloatRect>& mask_boxes = pPage->GetMaskBoundingBoxes();
std::vector<FX_RECT> bitmap_areas(mask_boxes.size());
std::vector<RetainPtr<CFX_DIBitmap>> bitmaps(mask_boxes.size());
for (size_t i = 0; i < mask_boxes.size(); i++) {
bitmaps[i] = GetMaskBitmap(pPage, start_x, start_y, size_x, size_y, rotate,
pBitmap, mask_boxes[i], &bitmap_areas[i]);
pContext->m_pRenderer->Continue(nullptr);
}
// Begin rendering to the printer. Add flag to indicate the renderer should
// pause after each image mask.
pPage->ClearRenderContext();
pOwnedContext = std::make_unique<CPDF_PageRenderContext>();
pContext = pOwnedContext.get();
pPage->SetRenderContext(std::move(pOwnedContext));
pContext->m_pDevice = std::make_unique<CPDF_WindowsRenderDevice>(
dc, render_data->GetPSFontTracker());
pContext->m_pOptions = std::make_unique<CPDF_RenderOptions>();
pContext->m_pOptions->GetOptions().bBreakForMasks = true;
CPDFSDK_RenderPageWithContext(pContext, pPage, start_x, start_y, size_x,
size_y, rotate, flags, /*color_scheme=*/nullptr,
/*need_to_restore=*/true,
/*pause=*/nullptr);
// Render masks
for (size_t i = 0; i < mask_boxes.size(); i++) {
// Render the bitmap for the mask and free the bitmap.
if (bitmaps[i]) { // will be null if mask has zero area
RenderBitmap(pContext->m_pDevice.get(), bitmaps[i], bitmap_areas[i]);
}
// Render the next portion of page.
pContext->m_pRenderer->Continue(nullptr);
}
}
#endif // BUILDFLAG(IS_WIN)
FPDF_EXPORT void FPDF_CALLCONV FPDF_RenderPageBitmap(FPDF_BITMAP bitmap,
FPDF_PAGE page,
int start_x,
int start_y,
int size_x,
int size_y,
int rotate,
int flags) {
if (!bitmap)
return;
CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
if (!pPage)
return;
auto pOwnedContext = std::make_unique<CPDF_PageRenderContext>();
CPDF_PageRenderContext* pContext = pOwnedContext.get();
CPDF_Page::RenderContextClearer clearer(pPage);
pPage->SetRenderContext(std::move(pOwnedContext));
auto pOwnedDevice = std::make_unique<CFX_DefaultRenderDevice>();
CFX_DefaultRenderDevice* pDevice = pOwnedDevice.get();
pContext->m_pDevice = std::move(pOwnedDevice);
RetainPtr<CFX_DIBitmap> pBitmap(CFXDIBitmapFromFPDFBitmap(bitmap));
pDevice->Attach(pBitmap, !!(flags & FPDF_REVERSE_BYTE_ORDER), nullptr, false);
CPDFSDK_RenderPageWithContext(pContext, pPage, start_x, start_y, size_x,
size_y, rotate, flags, /*color_scheme=*/nullptr,
/*need_to_restore=*/true,
/*pause=*/nullptr);
#if defined(_SKIA_SUPPORT_PATHS_)
pDevice->Flush(true);
pBitmap->UnPreMultiply();
#endif
}
FPDF_EXPORT void FPDF_CALLCONV
FPDF_RenderPageBitmapWithMatrix(FPDF_BITMAP bitmap,
FPDF_PAGE page,
const FS_MATRIX* matrix,
const FS_RECTF* clipping,
int flags) {
if (!bitmap)
return;
CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
if (!pPage)
return;
auto pOwnedContext = std::make_unique<CPDF_PageRenderContext>();
CPDF_PageRenderContext* pContext = pOwnedContext.get();
CPDF_Page::RenderContextClearer clearer(pPage);
pPage->SetRenderContext(std::move(pOwnedContext));
auto pOwnedDevice = std::make_unique<CFX_DefaultRenderDevice>();
CFX_DefaultRenderDevice* pDevice = pOwnedDevice.get();
pContext->m_pDevice = std::move(pOwnedDevice);
RetainPtr<CFX_DIBitmap> pBitmap(CFXDIBitmapFromFPDFBitmap(bitmap));
pDevice->Attach(pBitmap, !!(flags & FPDF_REVERSE_BYTE_ORDER), nullptr, false);
CFX_FloatRect clipping_rect;
if (clipping)
clipping_rect = CFXFloatRectFromFSRectF(*clipping);
FX_RECT clip_rect = clipping_rect.ToFxRect();
const FX_RECT rect(0, 0, pPage->GetPageWidth(), pPage->GetPageHeight());
CFX_Matrix transform_matrix = pPage->GetDisplayMatrix(rect, 0);
if (matrix)
transform_matrix *= CFXMatrixFromFSMatrix(*matrix);
CPDFSDK_RenderPage(pContext, pPage, transform_matrix, clip_rect, flags,
/*color_scheme=*/nullptr);
}
#if defined(_SKIA_SUPPORT_)
FPDF_EXPORT FPDF_RECORDER FPDF_CALLCONV FPDF_RenderPageSkp(FPDF_PAGE page,
int size_x,
int size_y) {
CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
if (!pPage)
return nullptr;
auto pOwnedContext = std::make_unique<CPDF_PageRenderContext>();
CPDF_PageRenderContext* pContext = pOwnedContext.get();
CPDF_Page::RenderContextClearer clearer(pPage);
pPage->SetRenderContext(std::move(pOwnedContext));
auto skDevice = std::make_unique<CFX_DefaultRenderDevice>();
FPDF_RECORDER recorder = skDevice->CreateRecorder(size_x, size_y);
pContext->m_pDevice = std::move(skDevice);
CPDFSDK_RenderPageWithContext(pContext, pPage, 0, 0, size_x, size_y, 0, 0,
/*color_scheme=*/nullptr,
/*need_to_restore=*/true, /*pause=*/nullptr);
return recorder;
}
#endif // defined(_SKIA_SUPPORT_)
FPDF_EXPORT void FPDF_CALLCONV FPDF_ClosePage(FPDF_PAGE page) {
if (!page)
return;
// Take it back across the API and hold for duration of this function.
RetainPtr<IPDF_Page> pPage;
pPage.Unleak(IPDFPageFromFPDFPage(page));
if (pPage->AsXFAPage())
return;
CPDFSDK_PageView* pPageView =
static_cast<CPDFSDK_PageView*>(pPage->AsPDFPage()->GetView());
if (!pPageView || pPageView->IsBeingDestroyed())
return;
if (pPageView->IsLocked()) {
pPageView->TakePageOwnership();
return;
}
// This will delete the |pPageView| object. We must cleanup the PageView
// first because it will attempt to reset the View on the |pPage| during
// destruction.
pPageView->GetFormFillEnv()->RemovePageView(pPage.Get());
}
FPDF_EXPORT void FPDF_CALLCONV FPDF_CloseDocument(FPDF_DOCUMENT document) {
// Take it back across the API and throw it away,
std::unique_ptr<CPDF_Document>(CPDFDocumentFromFPDFDocument(document));
}
FPDF_EXPORT unsigned long FPDF_CALLCONV FPDF_GetLastError() {
return FXSYS_GetLastError();
}
FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV FPDF_DeviceToPage(FPDF_PAGE page,
int start_x,
int start_y,
int size_x,
int size_y,
int rotate,
int device_x,
int device_y,
double* page_x,
double* page_y) {
if (!page || !page_x || !page_y)
return false;
IPDF_Page* pPage = IPDFPageFromFPDFPage(page);
const FX_RECT rect(start_x, start_y, start_x + size_x, start_y + size_y);
absl::optional<CFX_PointF> pos =
pPage->DeviceToPage(rect, rotate, CFX_PointF(device_x, device_y));
if (!pos.has_value())
return false;
*page_x = pos->x;
*page_y = pos->y;
return true;
}
FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV FPDF_PageToDevice(FPDF_PAGE page,
int start_x,
int start_y,
int size_x,
int size_y,
int rotate,
double page_x,
double page_y,
int* device_x,
int* device_y) {
if (!page || !device_x || !device_y)
return false;
IPDF_Page* pPage = IPDFPageFromFPDFPage(page);
const FX_RECT rect(start_x, start_y, start_x + size_x, start_y + size_y);
CFX_PointF page_point(static_cast<float>(page_x), static_cast<float>(page_y));
absl::optional<CFX_PointF> pos =
pPage->PageToDevice(rect, rotate, page_point);
if (!pos.has_value())
return false;
*device_x = FXSYS_roundf(pos->x);
*device_y = FXSYS_roundf(pos->y);
return true;
}
FPDF_EXPORT FPDF_BITMAP FPDF_CALLCONV FPDFBitmap_Create(int width,
int height,
int alpha) {
auto pBitmap = pdfium::MakeRetain<CFX_DIBitmap>();
if (!pBitmap->Create(width, height,
alpha ? FXDIB_Format::kArgb : FXDIB_Format::kRgb32)) {
return nullptr;
}
return FPDFBitmapFromCFXDIBitmap(pBitmap.Leak());
}
FPDF_EXPORT FPDF_BITMAP FPDF_CALLCONV FPDFBitmap_CreateEx(int width,
int height,
int format,
void* first_scan,
int stride) {
FXDIB_Format fx_format;
switch (format) {
case FPDFBitmap_Gray:
fx_format = FXDIB_Format::k8bppRgb;
break;
case FPDFBitmap_BGR:
fx_format = FXDIB_Format::kRgb;
break;
case FPDFBitmap_BGRx:
fx_format = FXDIB_Format::kRgb32;
break;
case FPDFBitmap_BGRA:
fx_format = FXDIB_Format::kArgb;
break;
default:
return nullptr;
}
// Ensure external memory is good at least for the duration of this call.
UnownedPtr<uint8_t> pChecker(static_cast<uint8_t*>(first_scan));
auto pBitmap = pdfium::MakeRetain<CFX_DIBitmap>();
if (!pBitmap->Create(width, height, fx_format, pChecker.Get(), stride))
return nullptr;
return FPDFBitmapFromCFXDIBitmap(pBitmap.Leak());
}
FPDF_EXPORT int FPDF_CALLCONV FPDFBitmap_GetFormat(FPDF_BITMAP bitmap) {
if (!bitmap)
return FPDFBitmap_Unknown;
FXDIB_Format format = CFXDIBitmapFromFPDFBitmap(bitmap)->GetFormat();
switch (format) {
case FXDIB_Format::k8bppRgb:
case FXDIB_Format::k8bppMask:
return FPDFBitmap_Gray;
case FXDIB_Format::kRgb:
return FPDFBitmap_BGR;
case FXDIB_Format::kRgb32:
return FPDFBitmap_BGRx;
case FXDIB_Format::kArgb:
return FPDFBitmap_BGRA;
default:
return FPDFBitmap_Unknown;
}
}
FPDF_EXPORT void FPDF_CALLCONV FPDFBitmap_FillRect(FPDF_BITMAP bitmap,
int left,
int top,
int width,
int height,
FPDF_DWORD color) {
if (!bitmap)
return;
CFX_DefaultRenderDevice device;
RetainPtr<CFX_DIBitmap> pBitmap(CFXDIBitmapFromFPDFBitmap(bitmap));
device.Attach(pBitmap, false, nullptr, false);
if (!pBitmap->IsAlphaFormat())
color |= 0xFF000000;
device.FillRect(FX_RECT(left, top, left + width, top + height),
static_cast<uint32_t>(color));
}
FPDF_EXPORT void* FPDF_CALLCONV FPDFBitmap_GetBuffer(FPDF_BITMAP bitmap) {
return bitmap ? CFXDIBitmapFromFPDFBitmap(bitmap)->GetBuffer() : nullptr;
}
FPDF_EXPORT int FPDF_CALLCONV FPDFBitmap_GetWidth(FPDF_BITMAP bitmap) {
return bitmap ? CFXDIBitmapFromFPDFBitmap(bitmap)->GetWidth() : 0;
}
FPDF_EXPORT int FPDF_CALLCONV FPDFBitmap_GetHeight(FPDF_BITMAP bitmap) {
return bitmap ? CFXDIBitmapFromFPDFBitmap(bitmap)->GetHeight() : 0;
}
FPDF_EXPORT int FPDF_CALLCONV FPDFBitmap_GetStride(FPDF_BITMAP bitmap) {
return bitmap ? CFXDIBitmapFromFPDFBitmap(bitmap)->GetPitch() : 0;
}
FPDF_EXPORT void FPDF_CALLCONV FPDFBitmap_Destroy(FPDF_BITMAP bitmap) {
RetainPtr<CFX_DIBitmap> destroyer;
destroyer.Unleak(CFXDIBitmapFromFPDFBitmap(bitmap));
}
FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV
FPDF_GetPageSizeByIndexF(FPDF_DOCUMENT document,
int page_index,
FS_SIZEF* size) {
if (!size)
return false;
auto* pDoc = CPDFDocumentFromFPDFDocument(document);
if (!pDoc)
return false;
#ifdef PDF_ENABLE_XFA
if (page_index < 0 || page_index >= FPDF_GetPageCount(document))
return false;
auto* pContext = static_cast<CPDFXFA_Context*>(pDoc->GetExtension());
if (pContext) {
RetainPtr<CPDFXFA_Page> pPage = pContext->GetOrCreateXFAPage(page_index);
if (!pPage)
return false;
size->width = pPage->GetPageWidth();
size->height = pPage->GetPageHeight();
return true;
}
#endif // PDF_ENABLE_XFA
CPDF_Dictionary* pDict = pDoc->GetPageDictionary(page_index);
if (!pDict)
return false;
auto page = pdfium::MakeRetain<CPDF_Page>(pDoc, pDict);
page->SetRenderCache(std::make_unique<CPDF_PageRenderCache>(page.Get()));
size->width = page->GetPageWidth();
size->height = page->GetPageHeight();
return true;
}
FPDF_EXPORT int FPDF_CALLCONV FPDF_GetPageSizeByIndex(FPDF_DOCUMENT document,
int page_index,
double* width,
double* height) {
if (!width || !height)
return false;
FS_SIZEF size;
if (!FPDF_GetPageSizeByIndexF(document, page_index, &size))
return false;
*width = size.width;
*height = size.height;
return true;
}
FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV
FPDF_VIEWERREF_GetPrintScaling(FPDF_DOCUMENT document) {
const CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
if (!pDoc)
return true;
CPDF_ViewerPreferences viewRef(pDoc);
return viewRef.PrintScaling();
}
FPDF_EXPORT int FPDF_CALLCONV
FPDF_VIEWERREF_GetNumCopies(FPDF_DOCUMENT document) {
const CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
if (!pDoc)
return 1;
CPDF_ViewerPreferences viewRef(pDoc);
return viewRef.NumCopies();
}
FPDF_EXPORT FPDF_PAGERANGE FPDF_CALLCONV
FPDF_VIEWERREF_GetPrintPageRange(FPDF_DOCUMENT document) {
const CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
if (!pDoc)
return nullptr;
CPDF_ViewerPreferences viewRef(pDoc);
return FPDFPageRangeFromCPDFArray(viewRef.PrintPageRange());
}
FPDF_EXPORT size_t FPDF_CALLCONV
FPDF_VIEWERREF_GetPrintPageRangeCount(FPDF_PAGERANGE pagerange) {
const CPDF_Array* pArray = CPDFArrayFromFPDFPageRange(pagerange);
return pArray ? pArray->size() : 0;
}
FPDF_EXPORT int FPDF_CALLCONV
FPDF_VIEWERREF_GetPrintPageRangeElement(FPDF_PAGERANGE pagerange,
size_t index) {
const CPDF_Array* pArray = CPDFArrayFromFPDFPageRange(pagerange);
if (!pArray || index >= pArray->size())
return -1;
return pArray->GetIntegerAt(index);
}
FPDF_EXPORT FPDF_DUPLEXTYPE FPDF_CALLCONV
FPDF_VIEWERREF_GetDuplex(FPDF_DOCUMENT document) {
const CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
if (!pDoc)
return DuplexUndefined;
CPDF_ViewerPreferences viewRef(pDoc);
ByteString duplex = viewRef.Duplex();
if ("Simplex" == duplex)
return Simplex;
if ("DuplexFlipShortEdge" == duplex)
return DuplexFlipShortEdge;
if ("DuplexFlipLongEdge" == duplex)
return DuplexFlipLongEdge;
return DuplexUndefined;
}
FPDF_EXPORT unsigned long FPDF_CALLCONV
FPDF_VIEWERREF_GetName(FPDF_DOCUMENT document,
FPDF_BYTESTRING key,
char* buffer,
unsigned long length) {
const CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
if (!pDoc)
return 0;
CPDF_ViewerPreferences viewRef(pDoc);
absl::optional<ByteString> bsVal = viewRef.GenericName(key);
if (!bsVal.has_value())
return 0;
return NulTerminateMaybeCopyAndReturnLength(bsVal.value(), buffer, length);
}
FPDF_EXPORT FPDF_DWORD FPDF_CALLCONV
FPDF_CountNamedDests(FPDF_DOCUMENT document) {
CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
if (!pDoc)
return 0;
const CPDF_Dictionary* pRoot = pDoc->GetRoot();
if (!pRoot)
return 0;
auto name_tree = CPDF_NameTree::Create(pDoc, "Dests");
FX_SAFE_UINT32 count = name_tree ? name_tree->GetCount() : 0;
const CPDF_Dictionary* pOldStyleDests = pRoot->GetDictFor("Dests");
if (pOldStyleDests)
count += pOldStyleDests->size();
return count.ValueOrDefault(0);
}
FPDF_EXPORT FPDF_DEST FPDF_CALLCONV
FPDF_GetNamedDestByName(FPDF_DOCUMENT document, FPDF_BYTESTRING name) {
if (!name || name[0] == 0)
return nullptr;
CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
if (!pDoc)
return nullptr;
ByteString dest_name(name);
return FPDFDestFromCPDFArray(CPDF_NameTree::LookupNamedDest(pDoc, dest_name));
}
#ifdef PDF_ENABLE_V8
FPDF_EXPORT const char* FPDF_CALLCONV FPDF_GetRecommendedV8Flags() {
// Use interpreted JS only to avoid RWX pages in our address space. Also,
// --jitless implies --no-expose-wasm, which reduce exposure since no PDF
// should contain web assembly.
return "--jitless";
}
FPDF_EXPORT void* FPDF_CALLCONV FPDF_GetArrayBufferAllocatorSharedInstance() {
static pdfium::base::NoDestructor<CFX_V8ArrayBufferAllocator> allocator;
return allocator.get();
}
#endif // PDF_ENABLE_V8
#ifdef PDF_ENABLE_XFA
FPDF_EXPORT FPDF_RESULT FPDF_CALLCONV FPDF_BStr_Init(FPDF_BSTR* bstr) {
if (!bstr)
return -1;
bstr->str = nullptr;
bstr->len = 0;
return 0;
}
FPDF_EXPORT FPDF_RESULT FPDF_CALLCONV FPDF_BStr_Set(FPDF_BSTR* bstr,
const char* cstr,
int length) {
if (!bstr || !cstr)
return -1;
if (length == -1)
length = pdfium::base::checked_cast<int>(strlen(cstr));
if (length == 0) {
FPDF_BStr_Clear(bstr);
return 0;
}
if (bstr->str && bstr->len < length)
bstr->str = FX_Realloc(char, bstr->str, length + 1);
else if (!bstr->str)
bstr->str = FX_Alloc(char, length + 1);
bstr->str[length] = 0;
memcpy(bstr->str, cstr, length);
bstr->len = length;
return 0;
}
FPDF_EXPORT FPDF_RESULT FPDF_CALLCONV FPDF_BStr_Clear(FPDF_BSTR* bstr) {
if (!bstr)
return -1;
if (bstr->str) {
FX_Free(bstr->str);
bstr->str = nullptr;
}
bstr->len = 0;
return 0;
}
#endif // PDF_ENABLE_XFA
FPDF_EXPORT FPDF_DEST FPDF_CALLCONV FPDF_GetNamedDest(FPDF_DOCUMENT document,
int index,
void* buffer,
long* buflen) {
if (!buffer)
*buflen = 0;
if (index < 0)
return nullptr;
CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
if (!pDoc)
return nullptr;
const CPDF_Dictionary* pRoot = pDoc->GetRoot();
if (!pRoot)
return nullptr;
auto name_tree = CPDF_NameTree::Create(pDoc, "Dests");
size_t name_tree_count = name_tree ? name_tree->GetCount() : 0;
CPDF_Object* pDestObj = nullptr;
WideString wsName;
if (static_cast<size_t>(index) >= name_tree_count) {
// If |index| is out of bounds, then try to retrieve the Nth old style named
// destination. Where N is 0-indexed, with N = index - name_tree_count.
const CPDF_Dictionary* pDest = pRoot->GetDictFor("Dests");
if (!pDest)
return nullptr;
FX_SAFE_INT32 checked_count = name_tree_count;
checked_count += pDest->size();
if (!checked_count.IsValid() || index >= checked_count.ValueOrDie())
return nullptr;
index -= name_tree_count;
int i = 0;
ByteStringView bsName;
CPDF_DictionaryLocker locker(pDest);
for (const auto& it : locker) {
bsName = it.first.AsStringView();
pDestObj = it.second.Get();
if (i == index)
break;
i++;
}
wsName = PDF_DecodeText(bsName.raw_span());
} else {
pDestObj = name_tree->LookupValueAndName(index, &wsName);
}
if (!pDestObj)
return nullptr;
if (CPDF_Dictionary* pDict = pDestObj->AsDictionary()) {
pDestObj = pDict->GetArrayFor("D");
if (!pDestObj)
return nullptr;
}
if (!pDestObj->IsArray())
return nullptr;
ByteString utf16Name = wsName.ToUTF16LE();
int len = pdfium::base::checked_cast<int>(utf16Name.GetLength());
if (!buffer) {
*buflen = len;
} else if (len <= *buflen) {
memcpy(buffer, utf16Name.c_str(), len);
*buflen = len;
} else {
*buflen = -1;
}
return FPDFDestFromCPDFArray(pDestObj->AsArray());
}
FPDF_EXPORT int FPDF_CALLCONV FPDF_GetXFAPacketCount(FPDF_DOCUMENT document) {
CPDF_Document* doc = CPDFDocumentFromFPDFDocument(document);
if (!doc)
return -1;
return fxcrt::CollectionSize<int>(
GetXFAPackets(GetXFAEntryFromDocument(doc)));
}
FPDF_EXPORT unsigned long FPDF_CALLCONV
FPDF_GetXFAPacketName(FPDF_DOCUMENT document,
int index,
void* buffer,
unsigned long buflen) {
CPDF_Document* doc = CPDFDocumentFromFPDFDocument(document);
if (!doc || index < 0)
return 0;
std::vector<XFAPacket> xfa_packets =
GetXFAPackets(GetXFAEntryFromDocument(doc));
if (static_cast<size_t>(index) >= xfa_packets.size())
return 0;
return NulTerminateMaybeCopyAndReturnLength(xfa_packets[index].name, buffer,
buflen);
}
FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV
FPDF_GetXFAPacketContent(FPDF_DOCUMENT document,
int index,
void* buffer,
unsigned long buflen,
unsigned long* out_buflen) {
CPDF_Document* doc = CPDFDocumentFromFPDFDocument(document);
if (!doc || index < 0 || !out_buflen)
return false;
std::vector<XFAPacket> xfa_packets =
GetXFAPackets(GetXFAEntryFromDocument(doc));
if (static_cast<size_t>(index) >= xfa_packets.size())
return false;
*out_buflen = DecodeStreamMaybeCopyAndReturnLength(xfa_packets[index].data,
buffer, buflen);
return true;
}
FPDF_EXPORT unsigned long FPDF_CALLCONV
FPDF_GetTrailerEnds(FPDF_DOCUMENT document,
unsigned int* buffer,
unsigned long length) {
auto* doc = CPDFDocumentFromFPDFDocument(document);
if (!doc)
return 0;
// Start recording trailer ends.
auto* parser = doc->GetParser();
CPDF_SyntaxParser* syntax = parser->GetSyntax();
std::vector<unsigned int> trailer_ends;
syntax->SetTrailerEnds(&trailer_ends);
// Traverse the document.
syntax->SetPos(0);
while (true) {
CPDF_SyntaxParser::WordResult word_result = syntax->GetNextWord();
if (word_result.is_number) {
// The object number was read. Read the generation number.
word_result = syntax->GetNextWord();
if (!word_result.is_number)
break;
word_result = syntax->GetNextWord();
if (word_result.word != "obj")
break;
syntax->GetObjectBody(nullptr);
word_result = syntax->GetNextWord();
if (word_result.word != "endobj")
break;
} else if (word_result.word == "trailer") {
syntax->GetObjectBody(nullptr);
} else if (word_result.word == "startxref") {
syntax->GetNextWord();
} else if (word_result.word == "xref") {
while (true) {
word_result = syntax->GetNextWord();
if (word_result.word.IsEmpty() || word_result.word == "startxref")
break;
}
syntax->GetNextWord();
} else {
break;
}
}
// Stop recording trailer ends.
syntax->SetTrailerEnds(nullptr);
const unsigned long trailer_ends_len =
fxcrt::CollectionSize<unsigned long>(trailer_ends);
if (buffer && length >= trailer_ends_len) {
for (size_t i = 0; i < trailer_ends_len; ++i)
buffer[i] = trailer_ends[i];
}
return trailer_ends_len;
}