| // Copyright 2017 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. |
| |
| #include "public/fpdf_attachment.h" |
| |
| #include <limits.h> |
| |
| #include <memory> |
| #include <utility> |
| |
| #include "constants/stream_dict_common.h" |
| #include "core/fdrm/fx_crypt.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_number.h" |
| #include "core/fpdfapi/parser/cpdf_reference.h" |
| #include "core/fpdfapi/parser/cpdf_stream.h" |
| #include "core/fpdfapi/parser/cpdf_string.h" |
| #include "core/fpdfapi/parser/fpdf_parser_decode.h" |
| #include "core/fpdfdoc/cpdf_filespec.h" |
| #include "core/fpdfdoc/cpdf_nametree.h" |
| #include "core/fxcrt/cfx_datetime.h" |
| #include "core/fxcrt/fx_extension.h" |
| #include "core/fxcrt/fx_memory_wrappers.h" |
| #include "fpdfsdk/cpdfsdk_helpers.h" |
| #include "third_party/base/numerics/safe_conversions.h" |
| |
| namespace { |
| |
| constexpr char kChecksumKey[] = "CheckSum"; |
| |
| ByteString CFXByteStringHexDecode(const ByteString& bsHex) { |
| std::unique_ptr<uint8_t, FxFreeDeleter> result; |
| uint32_t size = 0; |
| HexDecode(bsHex.raw_span(), &result, &size); |
| return ByteString(result.get(), size); |
| } |
| |
| ByteString GenerateMD5Base16(const void* contents, const unsigned long len) { |
| uint8_t digest[16]; |
| CRYPT_MD5Generate({static_cast<const uint8_t*>(contents), len}, digest); |
| char buf[32]; |
| for (int i = 0; i < 16; ++i) |
| FXSYS_IntToTwoHexChars(digest[i], &buf[i * 2]); |
| |
| return ByteString(buf, 32); |
| } |
| |
| } // namespace |
| |
| FPDF_EXPORT int FPDF_CALLCONV |
| FPDFDoc_GetAttachmentCount(FPDF_DOCUMENT document) { |
| CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document); |
| if (!pDoc) |
| return 0; |
| |
| auto name_tree = CPDF_NameTree::Create(pDoc, "EmbeddedFiles"); |
| return name_tree ? pdfium::base::checked_cast<int>(name_tree->GetCount()) : 0; |
| } |
| |
| FPDF_EXPORT FPDF_ATTACHMENT FPDF_CALLCONV |
| FPDFDoc_AddAttachment(FPDF_DOCUMENT document, FPDF_WIDESTRING name) { |
| CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document); |
| if (!pDoc) |
| return nullptr; |
| |
| WideString wsName = WideStringFromFPDFWideString(name); |
| if (wsName.IsEmpty()) |
| return nullptr; |
| |
| auto name_tree = |
| CPDF_NameTree::CreateWithRootNameArray(pDoc, "EmbeddedFiles"); |
| if (!name_tree) |
| return nullptr; |
| |
| // Set up the basic entries in the filespec dictionary. |
| CPDF_Dictionary* pFile = pDoc->NewIndirect<CPDF_Dictionary>(); |
| pFile->SetNewFor<CPDF_Name>("Type", "Filespec"); |
| pFile->SetNewFor<CPDF_String>("UF", wsName.AsStringView()); |
| pFile->SetNewFor<CPDF_String>(pdfium::stream::kF, wsName.AsStringView()); |
| |
| // Add the new attachment name and filespec into the document's EmbeddedFiles. |
| if (!name_tree->AddValueAndName(pFile->MakeReference(pDoc), wsName)) |
| return nullptr; |
| |
| return FPDFAttachmentFromCPDFObject(pFile); |
| } |
| |
| FPDF_EXPORT FPDF_ATTACHMENT FPDF_CALLCONV |
| FPDFDoc_GetAttachment(FPDF_DOCUMENT document, int index) { |
| CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document); |
| if (!pDoc || index < 0) |
| return nullptr; |
| |
| auto name_tree = CPDF_NameTree::Create(pDoc, "EmbeddedFiles"); |
| if (!name_tree || static_cast<size_t>(index) >= name_tree->GetCount()) |
| return nullptr; |
| |
| WideString csName; |
| return FPDFAttachmentFromCPDFObject( |
| name_tree->LookupValueAndName(index, &csName)); |
| } |
| |
| FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV |
| FPDFDoc_DeleteAttachment(FPDF_DOCUMENT document, int index) { |
| CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document); |
| if (!pDoc || index < 0) |
| return false; |
| |
| auto name_tree = CPDF_NameTree::Create(pDoc, "EmbeddedFiles"); |
| if (!name_tree || static_cast<size_t>(index) >= name_tree->GetCount()) |
| return false; |
| |
| return name_tree->DeleteValueAndName(index); |
| } |
| |
| FPDF_EXPORT unsigned long FPDF_CALLCONV |
| FPDFAttachment_GetName(FPDF_ATTACHMENT attachment, |
| FPDF_WCHAR* buffer, |
| unsigned long buflen) { |
| CPDF_Object* pFile = CPDFObjectFromFPDFAttachment(attachment); |
| if (!pFile) |
| return 0; |
| |
| return Utf16EncodeMaybeCopyAndReturnLength(CPDF_FileSpec(pFile).GetFileName(), |
| buffer, buflen); |
| } |
| |
| FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV |
| FPDFAttachment_HasKey(FPDF_ATTACHMENT attachment, FPDF_BYTESTRING key) { |
| CPDF_Object* pFile = CPDFObjectFromFPDFAttachment(attachment); |
| if (!pFile) |
| return 0; |
| |
| CPDF_Dictionary* pParamsDict = CPDF_FileSpec(pFile).GetParamsDict(); |
| return pParamsDict ? pParamsDict->KeyExist(key) : 0; |
| } |
| |
| FPDF_EXPORT FPDF_OBJECT_TYPE FPDF_CALLCONV |
| FPDFAttachment_GetValueType(FPDF_ATTACHMENT attachment, FPDF_BYTESTRING key) { |
| if (!FPDFAttachment_HasKey(attachment, key)) |
| return FPDF_OBJECT_UNKNOWN; |
| |
| CPDF_FileSpec spec(CPDFObjectFromFPDFAttachment(attachment)); |
| CPDF_Object* pObj = spec.GetParamsDict()->GetObjectFor(key); |
| return pObj ? pObj->GetType() : FPDF_OBJECT_UNKNOWN; |
| } |
| |
| FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV |
| FPDFAttachment_SetStringValue(FPDF_ATTACHMENT attachment, |
| FPDF_BYTESTRING key, |
| FPDF_WIDESTRING value) { |
| CPDF_Object* pFile = CPDFObjectFromFPDFAttachment(attachment); |
| if (!pFile) |
| return false; |
| |
| CPDF_Dictionary* pParamsDict = CPDF_FileSpec(pFile).GetParamsDict(); |
| if (!pParamsDict) |
| return false; |
| |
| ByteString bsKey = key; |
| ByteString bsValue = ByteStringFromFPDFWideString(value); |
| bool bEncodedAsHex = bsKey == kChecksumKey; |
| if (bEncodedAsHex) |
| bsValue = CFXByteStringHexDecode(bsValue); |
| |
| pParamsDict->SetNewFor<CPDF_String>(bsKey, bsValue, bEncodedAsHex); |
| return true; |
| } |
| |
| FPDF_EXPORT unsigned long FPDF_CALLCONV |
| FPDFAttachment_GetStringValue(FPDF_ATTACHMENT attachment, |
| FPDF_BYTESTRING key, |
| FPDF_WCHAR* buffer, |
| unsigned long buflen) { |
| CPDF_Object* pFile = CPDFObjectFromFPDFAttachment(attachment); |
| if (!pFile) |
| return 0; |
| |
| CPDF_Dictionary* pParamsDict = CPDF_FileSpec(pFile).GetParamsDict(); |
| if (!pParamsDict) |
| return 0; |
| |
| ByteString bsKey = key; |
| WideString value = pParamsDict->GetUnicodeTextFor(bsKey); |
| if (bsKey == kChecksumKey && !value.IsEmpty()) { |
| CPDF_String* stringValue = pParamsDict->GetObjectFor(bsKey)->AsString(); |
| if (stringValue->IsHex()) { |
| ByteString encoded = |
| PDF_HexEncodeString(stringValue->GetString().AsStringView()); |
| value = pdfium::MakeRetain<CPDF_String>(nullptr, encoded, false) |
| ->GetUnicodeText(); |
| } |
| } |
| |
| return Utf16EncodeMaybeCopyAndReturnLength(value, buffer, buflen); |
| } |
| |
| FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV |
| FPDFAttachment_SetFile(FPDF_ATTACHMENT attachment, |
| FPDF_DOCUMENT document, |
| const void* contents, |
| unsigned long len) { |
| CPDF_Object* pFile = CPDFObjectFromFPDFAttachment(attachment); |
| CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document); |
| if (!pFile || !pFile->IsDictionary() || !pDoc || len > INT_MAX) |
| return false; |
| |
| // An empty content must have a zero length. |
| if (!contents && len != 0) |
| return false; |
| |
| // Create a dictionary for the new embedded file stream. |
| auto pFileStreamDict = pdfium::MakeRetain<CPDF_Dictionary>(); |
| CPDF_Dictionary* pParamsDict = |
| pFileStreamDict->SetNewFor<CPDF_Dictionary>("Params"); |
| |
| // Set the size of the new file in the dictionary. |
| pFileStreamDict->SetNewFor<CPDF_Number>(pdfium::stream::kDL, |
| static_cast<int>(len)); |
| pParamsDict->SetNewFor<CPDF_Number>("Size", static_cast<int>(len)); |
| |
| // Set the creation date of the new attachment in the dictionary. |
| CFX_DateTime dateTime = CFX_DateTime::Now(); |
| pParamsDict->SetNewFor<CPDF_String>( |
| "CreationDate", |
| ByteString::Format("D:%d%02d%02d%02d%02d%02d", dateTime.GetYear(), |
| dateTime.GetMonth(), dateTime.GetDay(), |
| dateTime.GetHour(), dateTime.GetMinute(), |
| dateTime.GetSecond()), |
| false); |
| |
| // Set the checksum of the new attachment in the dictionary. |
| pParamsDict->SetNewFor<CPDF_String>( |
| kChecksumKey, CFXByteStringHexDecode(GenerateMD5Base16(contents, len)), |
| true); |
| |
| // Create the file stream and have the filespec dictionary link to it. |
| std::unique_ptr<uint8_t, FxFreeDeleter> stream(FX_AllocUninit(uint8_t, len)); |
| memcpy(stream.get(), contents, len); |
| CPDF_Stream* pFileStream = pDoc->NewIndirect<CPDF_Stream>( |
| std::move(stream), len, std::move(pFileStreamDict)); |
| CPDF_Dictionary* pEFDict = |
| pFile->AsDictionary()->SetNewFor<CPDF_Dictionary>("EF"); |
| pEFDict->SetNewFor<CPDF_Reference>("F", pDoc, pFileStream->GetObjNum()); |
| return true; |
| } |
| |
| FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV |
| FPDFAttachment_GetFile(FPDF_ATTACHMENT attachment, |
| void* buffer, |
| unsigned long buflen, |
| unsigned long* out_buflen) { |
| if (!out_buflen) |
| return false; |
| |
| CPDF_Object* pFile = CPDFObjectFromFPDFAttachment(attachment); |
| if (!pFile) |
| return false; |
| |
| CPDF_Stream* pFileStream = CPDF_FileSpec(pFile).GetFileStream(); |
| if (!pFileStream) |
| return false; |
| |
| *out_buflen = |
| DecodeStreamMaybeCopyAndReturnLength(pFileStream, buffer, buflen); |
| return true; |
| } |