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 #include "wx/wxprec.h"
  10
  11 #ifdef __BORLANDC__
  12 #pragma hdrstop
  13 #endif
  14
  15 #if wxUSE_FILESYSTEM && wxUSE_STREAMS
  16
  17 #include "wx/fs_mem.h"
  18
  19 #if wxUSE_GUI
  20     #include "wx/image.h"
  21     #include "wx/bitmap.h"
  22 #endif // wxUSE_GUI
  23
  24 #ifndef WXPRECOMP
  25     #include "wx/intl.h"
  26     #include "wx/log.h"
  27     #include "wx/hash.h"
  28 #endif
  29
  30 #include "wx/mstream.h"
  31
  32 class MemFSHashObj : public wxObject
  33 {
  34     public:
  35
  36         MemFSHashObj(const void *data, size_t len)
  37         {
  38             m_Data = new char[len];
  39             memcpy(m_Data, data, len);
  40             m_Len = len;
  41             InitTime();
  42         }
  43
  44         MemFSHashObj(const wxMemoryOutputStream& stream)
  45         {
  46             m_Len = stream.GetSize();
  47             m_Data = new char[m_Len];
  48             stream.CopyTo(m_Data, m_Len);
  49             InitTime();
  50         }
  51
  52         ~MemFSHashObj()
  53         {
  54             delete[] m_Data;
  55         }
  56
  57         char *m_Data;
  58         size_t m_Len;
  59 #if wxUSE_DATETIME
  60         wxDateTime m_Time;
  61 #endif // wxUSE_DATETIME
  62
  63     DECLARE_NO_COPY_CLASS(MemFSHashObj)
  64
  65     private:
  66         void InitTime()
  67         {
  68 #if wxUSE_DATETIME
  69             m_Time = wxDateTime::Now();
  70 #endif // wxUSE_DATETIME
  71         }
  72 };
  73
  74 #if wxUSE_BASE
  75
  76
  77 //--------------------------------------------------------------------------------
  78 // wxMemoryFSHandler
  79 //--------------------------------------------------------------------------------
  80
  81
  82 wxHashTable *wxMemoryFSHandlerBase::m_Hash = NULL;
  83
  84
  85 wxMemoryFSHandlerBase::wxMemoryFSHandlerBase() : wxFileSystemHandler()
  86 {
  87 }
  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
  97     if (m_Hash)
  98     {
  99         WX_CLEAR_HASH_TABLE(*m_Hash);
 100         delete m_Hash;
 101         m_Hash = NULL;
 102     }
 103 }
 104
 105
 106
 107 bool wxMemoryFSHandlerBase::CanOpen(const wxString& location)
 108 {
 109     wxString p = GetProtocol(location);
 110     return (p == wxT("memory"));
 111 }
 112
 113
 114
 115
 116 wxFSFile* wxMemoryFSHandlerBase::OpenFile(wxFileSystem& WXUNUSED(fs), const wxString& location)
 117 {
 118     if (m_Hash)
 119     {
 120         MemFSHashObj *obj = (MemFSHashObj*) m_Hash -> Get(GetRightLocation(location));
 121         if (obj == NULL)  return NULL;
 122         else return new wxFSFile(new wxMemoryInputStream(obj -> m_Data, obj -> m_Len),
 123                             location,
 124                             GetMimeTypeFromExt(location),
 125                             GetAnchor(location)
 126 #if wxUSE_DATETIME
 127                             , obj -> m_Time
 128 #endif // wxUSE_DATETIME
 129                             );
 130     }
 131     else return NULL;
 132 }
 133
 134
 135
 136 wxString wxMemoryFSHandlerBase::FindFirst(const wxString& WXUNUSED(spec),
 137                                       int WXUNUSED(flags))
 138 {
 139     wxFAIL_MSG(wxT("wxMemoryFSHandlerBase::FindFirst not implemented"));
 140
 141     return wxEmptyString;
 142 }
 143
 144
 145
 146 wxString wxMemoryFSHandlerBase::FindNext()
 147 {
 148     wxFAIL_MSG(wxT("wxMemoryFSHandlerBase::FindNext not implemented"));
 149
 150     return wxEmptyString;
 151 }
 152
 153
 154 bool wxMemoryFSHandlerBase::CheckHash(const wxString& filename)
 155 {
 156     if (m_Hash == NULL)
 157     {
 158         m_Hash = new wxHashTable(wxKEY_STRING);
 159     }
 160
 161     if (m_Hash -> Get(filename) != NULL)
 162     {
 163         wxString s;
 164         s.Printf(_("Memory VFS already contains file '%s'!"), filename.c_str());
 165         wxLogError(s);
 166         return false;
 167     }
 168     else
 169         return true;
 170 }
 171
 172
 173 /*static*/ void wxMemoryFSHandlerBase::AddFile(const wxString& filename, const wxString& textdata)
 174 {
 175     AddFile(filename, (const void*) textdata.mb_str(), textdata.Length());
 176 }
 177
 178
 179 /*static*/ void wxMemoryFSHandlerBase::AddFile(const wxString& filename, const void *binarydata, size_t size)
 180 {
 181     if (!CheckHash(filename)) return;
 182     m_Hash -> Put(filename, new MemFSHashObj(binarydata, size));
 183 }
 184
 185
 186
 187 /*static*/ void wxMemoryFSHandlerBase::RemoveFile(const wxString& filename)
 188 {
 189     if (m_Hash == NULL ||
 190         m_Hash -> Get(filename) == NULL)
 191     {
 192         wxString s;
 193         s.Printf(_("Trying to remove file '%s' from memory VFS, but it is not loaded!"), filename.c_str());
 194         wxLogError(s);
 195     }
 196
 197     else
 198         delete m_Hash -> Delete(filename);
 199 }
 200
 201 #endif // wxUSE_BASE
 202
 203 #if wxUSE_GUI
 204
 205 #if wxUSE_IMAGE
 206 /*static*/ void
 207 wxMemoryFSHandler::AddFile(const wxString& filename,
 208                            const wxImage& image,
 209                            long type)
 210 {
 211     if (!CheckHash(filename)) return;
 212
 213     wxMemoryOutputStream mems;
 214     if (image.Ok() && image.SaveFile(mems, (int)type))
 215         m_Hash -> Put(filename, new MemFSHashObj(mems));
 216     else
 217     {
 218         wxString s;
 219         s.Printf(_("Failed to store image '%s' to memory VFS!"), filename.c_str());
 220         wxPrintf(wxT("'%s'\n"), s.c_str());
 221         wxLogError(s);
 222     }
 223 }
 224
 225 /*static*/ void
 226 wxMemoryFSHandler::AddFile(const wxString& filename,
 227                            const wxBitmap& bitmap,
 228                            long type)
 229 {
 230     wxImage img = bitmap.ConvertToImage();
 231     AddFile(filename, img, type);
 232 }
 233
 234 #endif // wxUSE_IMAGE
 235
 236 #endif // wxUSE_GUI
 237
 238
 239 #endif // wxUSE_FILESYSTEM && wxUSE_FS_ZIP
 240