summaryrefslogtreecommitdiff
path: root/core/fpdfdoc/cpdf_filespec.cpp
blob: 2f999bcf4e1a3cace67849f426f49de56608afb6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
// 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 "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(CPDF_Object* pObj) : m_pObj(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 (CPDF_Dictionary* pDict = m_pObj->AsDictionary()) {
    csFileName = pDict->GetUnicodeTextFor("UF");
    if (csFileName.IsEmpty()) {
      csFileName =
          WideString::FromLocal(pDict->GetStringFor("F").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);
}

CPDF_Stream* CPDF_FileSpec::GetFileStream() const {
  CPDF_Dictionary* pDict = m_pObj->AsDictionary();
  if (!pDict)
    return nullptr;

  // Get the embedded files dictionary.
  CPDF_Dictionary* pFiles = pDict->GetDictFor("EF");
  if (!pFiles)
    return nullptr;

  // Get the file stream of the highest precedence with its file specification
  // string available. Follows the same precedence order as GetFileName().
  constexpr const char* keys[] = {"UF", "F", "DOS", "Mac", "Unix"};
  size_t end = pDict->GetStringFor("FS") == "URL" ? 2 : FX_ArraySize(keys);
  for (size_t i = 0; i < end; ++i) {
    const ByteString& key = keys[i];
    if (!pDict->GetUnicodeTextFor(key).IsEmpty()) {
      CPDF_Stream* pStream = pFiles->GetStreamFor(key);
      if (pStream)
        return pStream;
    }
  }
  return nullptr;
}

CPDF_Dictionary* CPDF_FileSpec::GetParamsDict() const {
  CPDF_Stream* pStream = GetFileStream();
  if (!pStream)
    return nullptr;

  CPDF_Dictionary* pDict = pStream->GetDict();
  if (!pDict)
    return nullptr;

  return pDict->GetDictFor("Params");
}

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) {
  WideString wsStr = EncodeFileName(wsFileName);
  if (m_pObj->IsString()) {
    m_pObj->SetString(ByteString::FromUnicode(wsStr));
  } else if (CPDF_Dictionary* pDict = m_pObj->AsDictionary()) {
    pDict->SetNewFor<CPDF_String>("F", ByteString::FromUnicode(wsStr), false);
    pDict->SetNewFor<CPDF_String>("UF", PDF_EncodeText(wsStr), false);
  }
}