src/common/zipstrm.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        zipstream.cpp
   3 // Purpose:     input stream for ZIP archive access
   4 // Author:      Vaclav Slavik
   5 // Copyright:   (c) 1999 Vaclav Slavik
   6 // Licence:     wxWindows Licence
   7 /////////////////////////////////////////////////////////////////////////////
   8
   9 #ifdef __GNUG__
  10 #pragma implementation "zipstrm.h"
  11 #endif
  12
  13 // For compilers that support precompilation, includes "wx.h".
  14 #include "wx/wxprec.h"
  15
  16 #ifdef __BORLANDC__
  17   #pragma hdrstop
  18 #endif
  19
  20 #if wxUSE_STREAMS && wxUSE_ZIPSTREAM && wxUSE_ZLIB
  21
  22 #include "wx/log.h"
  23 #include "wx/intl.h"
  24 #include "wx/stream.h"
  25 #include "wx/wfstream.h"
  26 #include "wx/zipstrm.h"
  27
  28 /* Not the right solution (paths in makefiles) but... */
  29 #ifdef __BORLANDC__
  30 #include "../common/unzip.h"
  31 #else
  32 #include "unzip.h"
  33 #endif
  34
  35
  36 wxZipInputStream::wxZipInputStream(const wxString& archive, const wxString& file) : wxInputStream()
  37 {
  38     unz_file_info zinfo;
  39
  40     m_Pos = 0;
  41     m_Size = 0;
  42     m_Archive = (void*) unzOpen(archive.fn_str());
  43     if (m_Archive == NULL)
  44     {
  45         m_lasterror = wxStream_READ_ERR;
  46         return;
  47     }
  48     if (unzLocateFile((unzFile)m_Archive, file.fn_str(), 0) != UNZ_OK)
  49     {
  50         m_lasterror = wxStream_READ_ERR;
  51         return;
  52     }
  53
  54     unzGetCurrentFileInfo((unzFile)m_Archive, &zinfo, (char*) NULL, 0, (void*) NULL, 0, (char*) NULL, 0);
  55
  56     if (unzOpenCurrentFile((unzFile)m_Archive) != UNZ_OK)
  57     {
  58         m_lasterror = wxStream_READ_ERR;
  59         return;
  60     }
  61     m_Size = zinfo.uncompressed_size;
  62 }
  63
  64
  65
  66 wxZipInputStream::~wxZipInputStream()
  67 {
  68     if (m_Archive)
  69     {
  70         if (m_Size != 0)
  71             unzCloseCurrentFile((unzFile)m_Archive);
  72         unzClose((unzFile)m_Archive);
  73     }
  74 }
  75
  76
  77
  78 size_t wxZipInputStream::OnSysRead(void *buffer, size_t bufsize)
  79 {
  80     if (m_Pos + bufsize > m_Size) bufsize = m_Size - m_Pos;
  81     unzReadCurrentFile((unzFile)m_Archive, buffer, bufsize);
  82     m_Pos += bufsize;
  83     return bufsize;
  84 }
  85
  86
  87
  88 off_t wxZipInputStream::OnSysSeek(off_t seek, wxSeekMode mode)
  89 {
  90     off_t nextpos;
  91     void *buf;
  92
  93     switch (mode)
  94     {
  95         case wxFromCurrent : nextpos = seek + m_Pos; break;
  96         case wxFromStart : nextpos = seek; break;
  97         case wxFromEnd : nextpos = m_Size - 1 + seek; break;
  98         default : nextpos = m_Pos; break; /* just to fool compiler, never happens */
  99     }
 100
 101     // cheated seeking :
 102     if (nextpos > m_Pos)
 103     {
 104         buf = malloc(nextpos - m_Pos);
 105         unzReadCurrentFile((unzFile)m_Archive, buf, nextpos -  m_Pos);
 106         free(buf);
 107     }
 108     else if (nextpos < m_Pos) {
 109         unzCloseCurrentFile((unzFile)m_Archive);
 110         if (unzOpenCurrentFile((unzFile)m_Archive) != UNZ_OK)
 111         {
 112             m_lasterror = wxStream_READ_ERR;
 113             return m_Pos;
 114         }
 115         buf = malloc(nextpos);
 116         unzReadCurrentFile((unzFile)m_Archive, buf, nextpos);
 117         free(buf);
 118     }
 119
 120     m_Pos = nextpos;
 121     return m_Pos;
 122 }
 123
 124 #endif
 125   // wxUSE_STREAMS && wxUSE_ZIPSTREAM && wxUSE_ZLIB