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// Copyright 2016 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 "core/fpdfdoc/cpdf_filespec.h"
#include <vector>
#include "constants/stream_dict_common.h"
#include "core/fpdfapi/parser/cpdf_dictionary.h"
#include "core/fpdfapi/parser/cpdf_name.h"
#include "core/fpdfapi/parser/cpdf_object.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/fxcrt/fx_system.h"
namespace {
#if _FX_PLATFORM_ == _FX_PLATFORM_APPLE_ || \
_FX_PLATFORM_ == _FX_PLATFORM_WINDOWS_
WideString ChangeSlashToPlatform(const wchar_t* str) {
WideString result;
while (*str) {
if (*str == '/') {
#if _FX_PLATFORM_ == _FX_PLATFORM_APPLE_
result += L':';
#else
result += L'\\';
#endif
} else {
result += *str;
}
str++;
}
return result;
}
WideString ChangeSlashToPDF(const wchar_t* str) {
WideString result;
while (*str) {
if (*str == '\\' || *str == ':')
result += L'/';
else
result += *str;
str++;
}
return result;
}
#endif // _FX_PLATFORM_APPLE_ || _FX_PLATFORM_WINDOWS_
} // namespace
CPDF_FileSpec::CPDF_FileSpec(const CPDF_Object* pObj) : m_pObj(pObj) {
ASSERT(m_pObj);
}
CPDF_FileSpec::CPDF_FileSpec(CPDF_Object* pObj)
: m_pObj(pObj), m_pWritableObj(pObj) {
ASSERT(m_pObj);
}
CPDF_FileSpec::~CPDF_FileSpec() {}
WideString CPDF_FileSpec::DecodeFileName(const WideString& filepath) {
if (filepath.GetLength() <= 1)
return WideString();
#if _FX_PLATFORM_ == _FX_PLATFORM_APPLE_
if (filepath.Left(sizeof("/Mac") - 1) == WideStringView(L"/Mac"))
return ChangeSlashToPlatform(filepath.c_str() + 1);
return ChangeSlashToPlatform(filepath.c_str());
#elif _FX_PLATFORM_ == _FX_PLATFORM_WINDOWS_
if (filepath[0] != L'/')
return ChangeSlashToPlatform(filepath.c_str());
if (filepath[1] == L'/')
return ChangeSlashToPlatform(filepath.c_str() + 1);
if (filepath[2] == L'/') {
WideString result;
result += filepath[1];
result += L':';
result += ChangeSlashToPlatform(filepath.c_str() + 2);
return result;
}
WideString result;
result += L'\\';
result += ChangeSlashToPlatform(filepath.c_str());
return result;
#else
return WideString(filepath);
#endif
}
WideString CPDF_FileSpec::GetFileName() const {
WideString csFileName;
if (const CPDF_Dictionary* pDict = m_pObj->AsDictionary()) {
csFileName = pDict->GetUnicodeTextFor("UF");
if (csFileName.IsEmpty()) {
csFileName = WideString::FromLocal(
pDict->GetStringFor(pdfium::stream::kF).AsStringView());
}
if (pDict->GetStringFor("FS") == "URL")
return csFileName;
if (csFileName.IsEmpty()) {
constexpr const char* keys[] = {"DOS", "Mac", "Unix"};
for (const auto* key : keys) {
if (pDict->KeyExist(key)) {
csFileName =
WideString::FromLocal(pDict->GetStringFor(key).AsStringView());
break;
}
}
}
} else if (m_pObj->IsString()) {
csFileName = WideString::FromLocal(m_pObj->GetString().AsStringView());
}
return DecodeFileName(csFileName);
}
const CPDF_Stream* CPDF_FileSpec::GetFileStream() const {
const CPDF_Dictionary* pDict = m_pObj->AsDictionary();
if (!pDict)
return nullptr;
// Get the embedded files dictionary.
const CPDF_Dictionary* pFiles = pDict->GetDictFor("EF");
if (!pFiles)
return nullptr;
// List of keys to check for the file specification string.
// Follows the same precedence order as GetFileName().
constexpr const char* kKeys[] = {"UF", "F", "DOS", "Mac", "Unix"};
size_t end = pDict->GetStringFor("FS") == "URL" ? 2 : FX_ArraySize(kKeys);
for (size_t i = 0; i < end; ++i) {
ByteString key = kKeys[i];
if (!pDict->GetUnicodeTextFor(key).IsEmpty()) {
const CPDF_Stream* pStream = pFiles->GetStreamFor(key);
if (pStream)
return pStream;
}
}
return nullptr;
}
CPDF_Stream* CPDF_FileSpec::GetFileStream() {
return const_cast<CPDF_Stream*>(
static_cast<const CPDF_FileSpec*>(this)->GetFileStream());
}
const CPDF_Dictionary* CPDF_FileSpec::GetParamsDict() const {
const CPDF_Stream* pStream = GetFileStream();
if (!pStream)
return nullptr;
const CPDF_Dictionary* pDict = pStream->GetDict();
return pDict ? pDict->GetDictFor("Params") : nullptr;
}
CPDF_Dictionary* CPDF_FileSpec::GetParamsDict() {
return const_cast<CPDF_Dictionary*>(
static_cast<const CPDF_FileSpec*>(this)->GetParamsDict());
}
WideString CPDF_FileSpec::EncodeFileName(const WideString& filepath) {
if (filepath.GetLength() <= 1)
return WideString();
#if _FX_PLATFORM_ == _FX_PLATFORM_WINDOWS_
if (filepath[1] == L':') {
WideString result(L'/');
result += filepath[0];
if (filepath[2] != L'\\')
result += L'/';
result += ChangeSlashToPDF(filepath.c_str() + 2);
return result;
}
if (filepath[0] == L'\\' && filepath[1] == L'\\')
return ChangeSlashToPDF(filepath.c_str() + 1);
if (filepath[0] == L'\\')
return L'/' + ChangeSlashToPDF(filepath.c_str());
return ChangeSlashToPDF(filepath.c_str());
#elif _FX_PLATFORM_ == _FX_PLATFORM_APPLE_
if (filepath.Left(sizeof("Mac") - 1) == L"Mac")
return L'/' + ChangeSlashToPDF(filepath.c_str());
return ChangeSlashToPDF(filepath.c_str());
#else
return WideString(filepath);
#endif
}
void CPDF_FileSpec::SetFileName(const WideString& wsFileName) {
if (!m_pWritableObj) {
NOTREACHED();
return;
}
WideString wsStr = EncodeFileName(wsFileName);
if (m_pObj->IsString()) {
m_pWritableObj->SetString(ByteString::FromUnicode(wsStr));
} else if (CPDF_Dictionary* pDict = m_pWritableObj->AsDictionary()) {
pDict->SetNewFor<CPDF_String>(pdfium::stream::kF,
ByteString::FromUnicode(wsStr), false);
pDict->SetNewFor<CPDF_String>("UF", PDF_EncodeText(wsStr), false);
}
}
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