src/common/fs_mem.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/common/fs_mem.cpp
   3 // Purpose:     in-memory file system
   4 // Author:      Vaclav Slavik
   5 // RCS-ID:      $Id$
   6 // Copyright:   (c) 2000 Vaclav Slavik
   7 // Licence:     wxWindows licence
   8 /////////////////////////////////////////////////////////////////////////////
   9
  10 #include "wx/wxprec.h"
  11
  12 #ifdef __BORLANDC__
  13     #pragma hdrstop
  14 #endif
  15
  16 #if wxUSE_FILESYSTEM && wxUSE_STREAMS
  17
  18 #include "wx/fs_mem.h"
  19
  20 #ifndef WX_PRECOMP
  21     #include "wx/intl.h"
  22     #include "wx/log.h"
  23     #include "wx/wxcrtvararg.h"
  24     #if wxUSE_GUI
  25         #include "wx/image.h"
  26     #endif // wxUSE_GUI
  27 #endif
  28
  29 #include "wx/mstream.h"
  30
  31 // represents a file entry in wxMemoryFS
  32 class wxMemoryFSFile
  33 {
  34 public:
  35     wxMemoryFSFile(const void *data, size_t len, const wxString& mime)
  36     {
  37         m_Data = new char[len];
  38         memcpy(m_Data, data, len);
  39         m_Len = len;
  40         m_MimeType = mime;
  41         InitTime();
  42     }
  43
  44     wxMemoryFSFile(const wxMemoryOutputStream& stream, const wxString& mime)
  45     {
  46         m_Len = stream.GetSize();
  47         m_Data = new char[m_Len];
  48         stream.CopyTo(m_Data, m_Len);
  49         m_MimeType = mime;
  50         InitTime();
  51     }
  52
  53     virtual ~wxMemoryFSFile()
  54     {
  55         delete[] m_Data;
  56     }
  57
  58     char *m_Data;
  59     size_t m_Len;
  60     wxString m_MimeType;
  61 #if wxUSE_DATETIME
  62     wxDateTime m_Time;
  63 #endif // wxUSE_DATETIME
  64
  65 private:
  66     void InitTime()
  67     {
  68 #if wxUSE_DATETIME
  69         m_Time = wxDateTime::Now();
  70 #endif // wxUSE_DATETIME
  71     }
  72
  73     DECLARE_NO_COPY_CLASS(wxMemoryFSFile)
  74 };
  75
  76 #if wxUSE_BASE
  77
  78
  79 //--------------------------------------------------------------------------------
  80 // wxMemoryFSHandler
  81 //--------------------------------------------------------------------------------
  82
  83
  84 wxMemoryFSHash wxMemoryFSHandlerBase::m_Hash;
  85
  86
  87 wxMemoryFSHandlerBase::wxMemoryFSHandlerBase() : wxFileSystemHandler()
  88 {
  89 }
  90
  91 wxMemoryFSHandlerBase::~wxMemoryFSHandlerBase()
  92 {
  93     // as only one copy of FS handler is supposed to exist, we may silently
  94     // delete static data here. (There is no way how to remove FS handler from
  95     // wxFileSystem other than releasing _all_ handlers.)
  96     WX_CLEAR_HASH_MAP(wxMemoryFSHash, m_Hash);
  97 }
  98
  99 bool wxMemoryFSHandlerBase::CanOpen(const wxString& location)
 100 {
 101     return GetProtocol(location) == "memory";
 102 }
 103
 104 wxFSFile * wxMemoryFSHandlerBase::OpenFile(wxFileSystem& WXUNUSED(fs),
 105                                            const wxString& location)
 106 {
 107     wxMemoryFSHash::const_iterator i = m_Hash.find(GetRightLocation(location));
 108     if ( i == m_Hash.end() )
 109         return NULL;
 110
 111     const wxMemoryFSFile * const obj = i->second;
 112
 113     return new wxFSFile
 114                (
 115                     new wxMemoryInputStream(obj->m_Data, obj->m_Len),
 116                     location,
 117                     obj->m_MimeType,
 118                     GetAnchor(location)
 119 #if wxUSE_DATETIME
 120                     , obj->m_Time
 121 #endif // wxUSE_DATETIME
 122                );
 123 }
 124
 125 wxString wxMemoryFSHandlerBase::FindFirst(const wxString& WXUNUSED(spec),
 126                                       int WXUNUSED(flags))
 127 {
 128     wxFAIL_MSG(wxT("wxMemoryFSHandlerBase::FindFirst not implemented"));
 129
 130     return wxEmptyString;
 131 }
 132
 133 wxString wxMemoryFSHandlerBase::FindNext()
 134 {
 135     wxFAIL_MSG(wxT("wxMemoryFSHandlerBase::FindNext not implemented"));
 136
 137     return wxEmptyString;
 138 }
 139
 140 bool wxMemoryFSHandlerBase::CheckDoesntExist(const wxString& filename)
 141 {
 142     if ( m_Hash.count(filename) )
 143     {
 144         wxLogError(_("Memory VFS already contains file '%s'!"), filename);
 145         return false;
 146     }
 147
 148     return true;
 149 }
 150
 151
 152 /*static*/
 153 void wxMemoryFSHandlerBase::AddFileWithMimeType(const wxString& filename,
 154                                                 const wxString& textdata,
 155                                                 const wxString& mimetype)
 156 {
 157     AddFileWithMimeType(filename,
 158                         (const void*) textdata.mb_str(), textdata.length(),
 159                         mimetype);
 160 }
 161
 162
 163 /*static*/
 164 void wxMemoryFSHandlerBase::AddFileWithMimeType(const wxString& filename,
 165                                                 const void *binarydata, size_t size,
 166                                                 const wxString& mimetype)
 167 {
 168     if ( !CheckDoesntExist(filename) )
 169         return;
 170
 171     m_Hash[filename] = new wxMemoryFSFile(binarydata, size, mimetype);
 172 }
 173
 174 /*static*/
 175 void wxMemoryFSHandlerBase::AddFile(const wxString& filename,
 176                                     const wxString& textdata)
 177 {
 178     AddFileWithMimeType(filename, textdata, wxEmptyString);
 179 }
 180
 181
 182 /*static*/
 183 void wxMemoryFSHandlerBase::AddFile(const wxString& filename,
 184                                     const void *binarydata, size_t size)
 185 {
 186     AddFileWithMimeType(filename, binarydata, size, wxEmptyString);
 187 }
 188
 189
 190
 191 /*static*/ void wxMemoryFSHandlerBase::RemoveFile(const wxString& filename)
 192 {
 193     wxMemoryFSHash::iterator i = m_Hash.find(filename);
 194     if ( i == m_Hash.end() )
 195     {
 196         wxLogError(_("Trying to remove file '%s' from memory VFS, "
 197                      "but it is not loaded!"),
 198                    filename);
 199         return;
 200     }
 201
 202     delete i->second;
 203     m_Hash.erase(i);
 204 }
 205
 206 #endif // wxUSE_BASE
 207
 208 #if wxUSE_GUI
 209
 210 #if wxUSE_IMAGE
 211 /*static*/ void
 212 wxMemoryFSHandler::AddFile(const wxString& filename,
 213                            const wxImage& image,
 214                            wxBitmapType type)
 215 {
 216     if ( !CheckDoesntExist(filename) )
 217         return;
 218
 219     wxMemoryOutputStream mems;
 220     if ( image.Ok() && image.SaveFile(mems, type) )
 221     {
 222         m_Hash[filename] = new wxMemoryFSFile
 223                                (
 224                                     mems,
 225                                     wxImage::FindHandler(type)->GetMimeType()
 226                                );
 227     }
 228     else
 229     {
 230         wxLogError(_("Failed to store image '%s' to memory VFS!"), filename);
 231     }
 232 }
 233
 234 /*static*/ void
 235 wxMemoryFSHandler::AddFile(const wxString& filename,
 236                            const wxBitmap& bitmap,
 237                            wxBitmapType type)
 238 {
 239     wxImage img = bitmap.ConvertToImage();
 240     AddFile(filename, img, type);
 241 }
 242
 243 #endif // wxUSE_IMAGE
 244
 245 #endif // wxUSE_GUI
 246
 247
 248 #endif // wxUSE_FILESYSTEM && wxUSE_FS_ZIP