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 #ifdef __GNUG__
  11 #pragma implementation
  12 #endif
  13
  14 #include "wx/wxprec.h"
  15
  16 #ifdef __BORDLANDC__
  17 #pragma hdrstop
  18 #endif
  19
  20 #if wxUSE_FILESYSTEM && wxUSE_STREAMS
  21
  22 #ifndef WXPRECOMP
  23 #include "wx/wx.h"
  24 #endif
  25
  26 #include "wx/filesys.h"
  27 #include "wx/fs_mem.h"
  28 #include "wx/mstream.h"
  29
  30
  31 class MemFSHashObj : public wxObject
  32 {
  33     public:
  34
  35         MemFSHashObj(const void *data, size_t len)
  36         {
  37             m_Data = new char[len];
  38             memcpy(m_Data, data, len);
  39             m_Len = len;
  40             m_Time = wxDateTime::Now();
  41         }
  42
  43         MemFSHashObj(wxMemoryOutputStream& stream)
  44         {
  45             m_Len = stream.GetSize();
  46             m_Data = new char[m_Len];
  47             stream.CopyTo(m_Data, m_Len);
  48             m_Time = wxDateTime::Now();
  49         }
  50
  51         ~MemFSHashObj()
  52         {
  53             delete[] m_Data;
  54         }
  55
  56         char *m_Data;
  57         size_t m_Len;
  58         wxDateTime m_Time;
  59 };
  60
  61
  62 //--------------------------------------------------------------------------------
  63 // wxMemoryFSHandler
  64 //--------------------------------------------------------------------------------
  65
  66
  67 wxHashTable *wxMemoryFSHandler::m_Hash = NULL;
  68
  69
  70 wxMemoryFSHandler::wxMemoryFSHandler() : wxFileSystemHandler()
  71 {
  72     m_Hash = NULL;
  73 }
  74
  75
  76
  77 wxMemoryFSHandler::~wxMemoryFSHandler()
  78 {
  79     // as only one copy of FS handler is supposed to exist, we may silently
  80     // delete static data here. (There is no way how to remove FS handler from
  81     // wxFileSystem other than releasing _all_ handlers.)
  82
  83     if (m_Hash) delete m_Hash;
  84     m_Hash = NULL;
  85 }
  86
  87
  88
  89 bool wxMemoryFSHandler::CanOpen(const wxString& location)
  90 {
  91     wxString p = GetProtocol(location);
  92     return (p == wxT("memory"));
  93 }
  94
  95
  96
  97
  98 wxFSFile* wxMemoryFSHandler::OpenFile(wxFileSystem& WXUNUSED(fs), const wxString& location)
  99 {
 100     if (m_Hash)
 101     {
 102         MemFSHashObj *obj = (MemFSHashObj*) m_Hash -> Get(GetRightLocation(location));
 103         if (obj == NULL)  return NULL;
 104         else return new wxFSFile(new wxMemoryInputStream(obj -> m_Data, obj -> m_Len),
 105                             location,
 106                             GetMimeTypeFromExt(location),
 107                             GetAnchor(location),
 108                             obj -> m_Time);
 109     }
 110     else return NULL;
 111 }
 112
 113
 114
 115 wxString wxMemoryFSHandler::FindFirst(const wxString& WXUNUSED(spec),
 116                                       int WXUNUSED(flags))
 117 {
 118     wxFAIL_MSG(wxT("wxMemoryFSHandler::FindFirst not implemented"));
 119
 120     return wxEmptyString;
 121 }
 122
 123
 124
 125 wxString wxMemoryFSHandler::FindNext()
 126 {
 127     wxFAIL_MSG(wxT("wxMemoryFSHandler::FindNext not implemented"));
 128
 129     return wxEmptyString;
 130 }
 131
 132
 133 bool wxMemoryFSHandler::CheckHash(const wxString& filename)
 134 {
 135     if (m_Hash == NULL)
 136     {
 137         m_Hash = new wxHashTable(wxKEY_STRING);
 138         m_Hash -> DeleteContents(TRUE);
 139     }
 140
 141     if (m_Hash -> Get(filename) != NULL)
 142     {
 143         wxString s;
 144         s.Printf(_("Memory VFS already contains file '%s'!"), filename.c_str());
 145         wxLogError(s);
 146         return FALSE;
 147     }
 148     else
 149         return TRUE;
 150 }
 151
 152
 153
 154 #if wxUSE_GUI
 155
 156 /*static*/ void wxMemoryFSHandler::AddFile(const wxString& filename, wxImage& image, long type)
 157 {
 158     if (!CheckHash(filename)) return;
 159
 160
 161     wxMemoryOutputStream mems;
 162     if (image.Ok() && image.SaveFile(mems, (int)type))
 163         m_Hash -> Put(filename, new MemFSHashObj(mems));
 164     else
 165     {
 166         wxString s;
 167         s.Printf(_("Failed to store image '%s' to memory VFS!"), filename.c_str());
 168         wxPrintf(wxT("'%s'\n"), s.c_str());
 169         wxLogError(s);
 170     }
 171 }
 172
 173
 174 /*static*/ void wxMemoryFSHandler::AddFile(const wxString& filename, const wxBitmap& bitmap, long type)
 175 {
 176     wxImage img(bitmap);
 177     AddFile(filename, img, type);
 178 }
 179
 180 #endif
 181
 182 /*static*/ void wxMemoryFSHandler::AddFile(const wxString& filename, const wxString& textdata)
 183 {
 184     AddFile(filename, (const void*) textdata.mb_str(), textdata.Length());
 185 }
 186
 187
 188 /*static*/ void wxMemoryFSHandler::AddFile(const wxString& filename, const void *binarydata, size_t size)
 189 {
 190     if (!CheckHash(filename)) return;
 191     m_Hash -> Put(filename, new MemFSHashObj(binarydata, size));
 192 }
 193
 194
 195
 196 /*static*/ void wxMemoryFSHandler::RemoveFile(const wxString& filename)
 197 {
 198     if (m_Hash == NULL ||
 199         m_Hash -> Get(filename) == NULL)
 200     {
 201         wxString s;
 202         s.Printf(_("Trying to remove file '%s' from memory VFS, but it is not loaded!"), filename.c_str());
 203         wxLogError(s);
 204     }
 205
 206     else
 207         delete m_Hash -> Delete(filename);
 208 }
 209
 210
 211
 212 #endif // wxUSE_FILESYSTEM && wxUSE_FS_ZIP