src/common/fs_mem.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        fs_mem.cpp
   3 // Purpose:     in-memory file system
   4 // Author:      Vaclav Slavik
   5 // Copyright:   (c) 2000 Vaclav Slavik
   6 // Licence:     wxWindows licence
   7 /////////////////////////////////////////////////////////////////////////////
   8
   9
  10 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA) && !defined(__EMX__)
  11 // Some older compilers (such as EMX) cannot handle
  12 // #pragma interface/implementation correctly, iff
  13 // #pragma implementation is used in _two_ translation
  14 // units (as created by e.g. event.cpp compiled for
  15 // libwx_base and event.cpp compiled for libwx_gui_core).
  16 // So we must not use those pragmas for those compilers in
  17 // such files.
  18 #pragma implementation "fs_mem.h"
  19 #endif
  20
  21 #include "wx/wxprec.h"
  22
  23 #ifdef __BORLANDC__
  24 #pragma hdrstop
  25 #endif
  26
  27 #if wxUSE_FILESYSTEM && wxUSE_STREAMS
  28
  29 #include "wx/fs_mem.h"
  30
  31 #if wxUSE_GUI
  32     #include "wx/image.h"
  33     #include "wx/bitmap.h"
  34 #endif // wxUSE_GUI
  35
  36 #ifndef WXPRECOMP
  37     #include "wx/intl.h"
  38     #include "wx/log.h"
  39     #include "wx/hash.h"
  40 #endif
  41
  42 #include "wx/mstream.h"
  43
  44 class MemFSHashObj : public wxObject
  45 {
  46     public:
  47
  48         MemFSHashObj(const void *data, size_t len)
  49         {
  50             m_Data = new char[len];
  51             memcpy(m_Data, data, len);
  52             m_Len = len;
  53             InitTime();
  54         }
  55
  56         MemFSHashObj(wxMemoryOutputStream& stream)
  57         {
  58             m_Len = stream.GetSize();
  59             m_Data = new char[m_Len];
  60             stream.CopyTo(m_Data, m_Len);
  61             InitTime();
  62         }
  63
  64         ~MemFSHashObj()
  65         {
  66             delete[] m_Data;
  67         }
  68
  69         char *m_Data;
  70         size_t m_Len;
  71 #if wxUSE_DATETIME
  72         wxDateTime m_Time;
  73 #endif // wxUSE_DATETIME
  74
  75     DECLARE_NO_COPY_CLASS(MemFSHashObj)
  76
  77     private:
  78         void InitTime()
  79         {
  80 #if wxUSE_DATETIME
  81             m_Time = wxDateTime::Now();
  82 #endif // wxUSE_DATETIME
  83         }
  84 };
  85
  86 #if wxUSE_BASE
  87
  88
  89 //--------------------------------------------------------------------------------
  90 // wxMemoryFSHandler
  91 //--------------------------------------------------------------------------------
  92
  93
  94 wxHashTable *wxMemoryFSHandlerBase::m_Hash = NULL;
  95
  96
  97 wxMemoryFSHandlerBase::wxMemoryFSHandlerBase() : wxFileSystemHandler()
  98 {
  99 }
 100
 101
 102
 103 wxMemoryFSHandlerBase::~wxMemoryFSHandlerBase()
 104 {
 105     // as only one copy of FS handler is supposed to exist, we may silently
 106     // delete static data here. (There is no way how to remove FS handler from
 107     // wxFileSystem other than releasing _all_ handlers.)
 108
 109     if (m_Hash)
 110     {
 111         WX_CLEAR_HASH_TABLE(*m_Hash);
 112         delete m_Hash;
 113         m_Hash = NULL;
 114     }
 115 }
 116
 117
 118
 119 bool wxMemoryFSHandlerBase::CanOpen(const wxString& location)
 120 {
 121     wxString p = GetProtocol(location);
 122     return (p == wxT("memory"));
 123 }
 124
 125
 126
 127
 128 wxFSFile* wxMemoryFSHandlerBase::OpenFile(wxFileSystem& WXUNUSED(fs), const wxString& location)
 129 {
 130     if (m_Hash)
 131     {
 132         MemFSHashObj *obj = (MemFSHashObj*) m_Hash -> Get(GetRightLocation(location));
 133         if (obj == NULL)  return NULL;
 134         else return new wxFSFile(new wxMemoryInputStream(obj -> m_Data, obj -> m_Len),
 135                             location,
 136                             GetMimeTypeFromExt(location),
 137                             GetAnchor(location)
 138 #if wxUSE_DATETIME
 139                             , obj -> m_Time
 140 #endif // wxUSE_DATETIME
 141                             );
 142     }
 143     else return NULL;
 144 }
 145
 146
 147
 148 wxString wxMemoryFSHandlerBase::FindFirst(const wxString& WXUNUSED(spec),
 149                                       int WXUNUSED(flags))
 150 {
 151     wxFAIL_MSG(wxT("wxMemoryFSHandlerBase::FindFirst not implemented"));
 152
 153     return wxEmptyString;
 154 }
 155
 156
 157
 158 wxString wxMemoryFSHandlerBase::FindNext()
 159 {
 160     wxFAIL_MSG(wxT("wxMemoryFSHandlerBase::FindNext not implemented"));
 161
 162     return wxEmptyString;
 163 }
 164
 165
 166 bool wxMemoryFSHandlerBase::CheckHash(const wxString& filename)
 167 {
 168     if (m_Hash == NULL)
 169     {
 170         m_Hash = new wxHashTable(wxKEY_STRING);
 171     }
 172
 173     if (m_Hash -> Get(filename) != NULL)
 174     {
 175         wxString s;
 176         s.Printf(_("Memory VFS already contains file '%s'!"), filename.c_str());
 177         wxLogError(s);
 178         return false;
 179     }
 180     else
 181         return true;
 182 }
 183
 184
 185 /*static*/ void wxMemoryFSHandlerBase::AddFile(const wxString& filename, const wxString& textdata)
 186 {
 187     AddFile(filename, (const void*) textdata.mb_str(), textdata.Length());
 188 }
 189
 190
 191 /*static*/ void wxMemoryFSHandlerBase::AddFile(const wxString& filename, const void *binarydata, size_t size)
 192 {
 193     if (!CheckHash(filename)) return;
 194     m_Hash -> Put(filename, new MemFSHashObj(binarydata, size));
 195 }
 196
 197
 198
 199 /*static*/ void wxMemoryFSHandlerBase::RemoveFile(const wxString& filename)
 200 {
 201     if (m_Hash == NULL ||
 202         m_Hash -> Get(filename) == NULL)
 203     {
 204         wxString s;
 205         s.Printf(_("Trying to remove file '%s' from memory VFS, but it is not loaded!"), filename.c_str());
 206         wxLogError(s);
 207     }
 208
 209     else
 210         delete m_Hash -> Delete(filename);
 211 }
 212
 213 #endif // wxUSE_BASE
 214
 215 #if wxUSE_GUI
 216
 217 #if wxUSE_IMAGE
 218 /*static*/ void
 219 wxMemoryFSHandler::AddFile(const wxString& filename,
 220                            const wxImage& image,
 221                            long type)
 222 {
 223     if (!CheckHash(filename)) return;
 224
 225     wxMemoryOutputStream mems;
 226     if (image.Ok() && image.SaveFile(mems, (int)type))
 227         m_Hash -> Put(filename, new MemFSHashObj(mems));
 228     else
 229     {
 230         wxString s;
 231         s.Printf(_("Failed to store image '%s' to memory VFS!"), filename.c_str());
 232         wxPrintf(wxT("'%s'\n"), s.c_str());
 233         wxLogError(s);
 234     }
 235 }
 236
 237 /*static*/ void
 238 wxMemoryFSHandler::AddFile(const wxString& filename,
 239                            const wxBitmap& bitmap,
 240                            long type)
 241 {
 242     wxImage img = bitmap.ConvertToImage();
 243     AddFile(filename, img, type);
 244 }
 245
 246 #endif // wxUSE_IMAGE
 247
 248 #endif // wxUSE_GUI
 249
 250
 251 #endif // wxUSE_FILESYSTEM && wxUSE_FS_ZIP
 252