home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
OS/2 Shareware BBS: 10 Tools
/
10-Tools.zip
/
wxos2240.zip
/
wxWindows-2.4.0
/
src
/
common
/
zipstrm.cpp
< prev
next >
Wrap
C/C++ Source or Header
|
2002-11-04
|
4KB
|
160 lines
/////////////////////////////////////////////////////////////////////////////
// Name: zipstream.cpp
// Purpose: input stream for ZIP archive access
// Author: Vaclav Slavik
// Copyright: (c) 1999 Vaclav Slavik
// Licence: wxWindows Licence
/////////////////////////////////////////////////////////////////////////////
#ifdef __GNUG__
#pragma implementation "zipstrm.h"
#endif
// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"
#ifdef __BORLANDC__
#pragma hdrstop
#endif
#if wxUSE_STREAMS && wxUSE_ZIPSTREAM && wxUSE_ZLIB
#include "wx/log.h"
#include "wx/intl.h"
#include "wx/stream.h"
#include "wx/wfstream.h"
#include "wx/zipstrm.h"
#include "wx/utils.h"
/* Not the right solution (paths in makefiles) but... */
#ifdef __BORLANDC__
#include "../common/unzip.h"
#else
#include "unzip.h"
#endif
wxZipInputStream::wxZipInputStream(const wxString& archive, const wxString& file) : wxInputStream()
{
unz_file_info zinfo;
m_Pos = 0;
m_Size = 0;
m_Archive = (void*) unzOpen(archive.mb_str());
if (m_Archive == NULL)
{
m_lasterror = wxSTREAM_READ_ERROR;
return;
}
if (unzLocateFile((unzFile)m_Archive, file.mb_str(), 0) != UNZ_OK)
{
m_lasterror = wxSTREAM_READ_ERROR;
return;
}
unzGetCurrentFileInfo((unzFile)m_Archive, &zinfo, (char*) NULL, 0, (void*) NULL, 0, (char*) NULL, 0);
if (unzOpenCurrentFile((unzFile)m_Archive) != UNZ_OK)
{
m_lasterror = wxSTREAM_READ_ERROR;
return;
}
m_Size = (size_t)zinfo.uncompressed_size;
}
wxZipInputStream::~wxZipInputStream()
{
if (m_Archive)
{
if (m_Size != 0)
unzCloseCurrentFile((unzFile)m_Archive);
unzClose((unzFile)m_Archive);
}
}
bool wxZipInputStream::Eof() const
{
wxASSERT_MSG( m_Pos <= (off_t)m_Size,
_T("wxZipInputStream: invalid current position") );
return m_Pos >= (off_t)m_Size;
}
size_t wxZipInputStream::OnSysRead(void *buffer, size_t bufsize)
{
wxASSERT_MSG( m_Pos <= (off_t)m_Size,
_T("wxZipInputStream: invalid current position") );
if ( m_Pos >= (off_t)m_Size )
{
m_lasterror = wxSTREAM_EOF;
return 0;
}
if (m_Pos + bufsize > m_Size)
bufsize = m_Size - m_Pos;
unzReadCurrentFile((unzFile)m_Archive, buffer, bufsize);
m_Pos += bufsize;
return bufsize;
}
off_t wxZipInputStream::OnSysSeek(off_t seek, wxSeekMode mode)
{
// NB: since ZIP files don't natively support seeking, we have to
// implement a brute force workaround -- reading all the data
// between current and the new position (or between beginning of
// the file and new position...)
off_t nextpos;
switch ( mode )
{
case wxFromCurrent : nextpos = seek + m_Pos; break;
case wxFromStart : nextpos = seek; break;
case wxFromEnd : nextpos = m_Size - 1 + seek; break;
default : nextpos = m_Pos; break; /* just to fool compiler, never happens */
}
size_t toskip = 0;
if ( nextpos > m_Pos )
{
toskip = nextpos - m_Pos;
}
else
{
unzCloseCurrentFile((unzFile)m_Archive);
if (unzOpenCurrentFile((unzFile)m_Archive) != UNZ_OK)
{
m_lasterror = wxSTREAM_READ_ERROR;
return m_Pos;
}
toskip = nextpos;
}
if ( toskip > 0 )
{
const size_t BUFSIZE = 4096;
size_t sz;
char buffer[BUFSIZE];
while ( toskip > 0 )
{
sz = wxMin(toskip, BUFSIZE);
unzReadCurrentFile((unzFile)m_Archive, buffer, sz);
toskip -= sz;
}
}
m_Pos = nextpos;
return m_Pos;
}
#endif
// wxUSE_STREAMS && wxUSE_ZIPSTREAM && wxUSE_ZLIB