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/////////////////////////////////////////////////////////////////////////////
// Name: Otherstreams.cpp
// Purpose: xz and lmza1 archive streams
// Part of: 4Pane
// Author: David Hart
// Copyright: (c) 2016 David Hart
// Licence: GPL v3
/////////////////////////////////////////////////////////////////////////////
#ifndef NO_LZMA_ARCHIVE_STREAMS
#include "wx/wxprec.h"
#include "wx/wx.h"
#include "wx/utils.h"
#include "wx/intl.h"
#include "wx/log.h"
#if wxUSE_STREAMS
#include "Externs.h"
#include "MyFrame.h"
#include "Otherstreams.h"
XzInputStream::XzInputStream(wxInputStream& Stream, bool use_lzma1 /*= false*/) : wxFilterInputStream(Stream), m_nBufferPos(0)
{
wxCHECK_RET(LIBLZMA_LOADED, wxT("We shouldn't be here if liblzma isn't loaded!"));
lzma_stream_decoder = (dl_lzma_stream_decoder)(wxGetApp().GetLiblzma()->GetSymbol(wxT("lzma_stream_decoder")));
if (!lzma_stream_decoder) { wxLogWarning(wxT("Failed to load symbol 'lzma_stream_decoder'")); return; }
lzma_alone_decoder = (dl_lzma_alone_decoder)(wxGetApp().GetLiblzma()->GetSymbol(wxT("lzma_alone_decoder")));
if (!lzma_alone_decoder) { wxLogWarning(wxT("Failed to load symbol 'lzma_alone_decoder'")); return; }
lzma_code = (dl_lzma_code)(wxGetApp().GetLiblzma()->GetSymbol(wxT("lzma_code")));
if (!lzma_code) { wxLogWarning(wxT("Failed to load symbol 'lzma_code'")); return; }
lzma_end = (dl_lzma_end)(wxGetApp().GetLiblzma()->GetSymbol(wxT("lzma_end")));
if (!lzma_end) { wxLogWarning(wxT("Failed to load symbol 'lzma_end'")); return; }
m_lzStream = (void*) new lzma_stream;
lzma_stream* lzstr = (lzma_stream*)m_lzStream;
memset(lzstr, 0, sizeof(lzma_stream)); // This is the recommended way of initialising a dynamically allocated lzma_stream
/* initialize xz (or lzma1) decoder */
lzma_ret ret_xz;
if (!use_lzma1)
ret_xz = lzma_stream_decoder(lzstr, UINT64_MAX, LZMA_TELL_UNSUPPORTED_CHECK /*| LZMA_CONCATENATED*/); // The LZMA_CONCATENATED doesn't seem to be needed
else
ret_xz = lzma_alone_decoder(lzstr, UINT64_MAX);
if (ret_xz != LZMA_OK)
{ delete lzstr;
wxLogSysError(wxT("Could not initialize %s decompression engine!"), use_lzma1 ? wxString(wxT("lzma1")).c_str():wxString(wxT("xz")).c_str());
}
}
XzInputStream::~XzInputStream()
{
lzma_stream* lzstr = (lzma_stream*)m_lzStream;
lzma_end(lzstr);
delete lzstr;
}
wxInputStream& XzInputStream::ReadRaw(void* pBuffer, size_t size)
{
return m_parent_i_stream->Read(pBuffer, size);
}
off_t XzInputStream::TellRawI()
{
return m_parent_i_stream->TellI();
}
off_t XzInputStream::SeekRawI(off_t pos, wxSeekMode sm)
{
return 0;
}
size_t XzInputStream::OnSysRead(void* buffer, size_t bufsize)
{
// This is a clone of wxZlibInputStream::OnSysRead, adjusted for xz
lzma_stream* lzstr = (lzma_stream*)m_lzStream;
if (!lzstr)
m_lasterror = wxSTREAM_READ_ERROR;
if (!IsOk() || !bufsize)
return 0;
lzma_ret ret_xz = LZMA_OK;
lzstr->next_out = (uint8_t*)buffer;
lzstr->avail_out = bufsize;
while (ret_xz == LZMA_OK && lzstr->avail_out > 0)
{ if (lzstr->avail_in == 0 && m_parent_i_stream->IsOk())
{ m_parent_i_stream->Read(m_pBuffer, IN_BUF_MAX);
lzstr->next_in = m_pBuffer;
lzstr->avail_in = m_parent_i_stream->LastRead();
}
ret_xz = lzma_code(lzstr, LZMA_RUN);
}
switch (ret_xz)
{ case LZMA_OK: break;
case LZMA_FINISH:
if (lzstr->avail_out) {
// 'Inflate' comment was: "Unread any data taken from past the end of the deflate stream, so that
// any additional data can be read from the underlying stream (the crc in a gzip for example)"
// I don't know if this is still relevant in xz, but it doesn't seem to do any harm; perhaps because it's not called
if (lzstr->avail_in) {
m_parent_i_stream->Reset();
m_parent_i_stream->Ungetch(lzstr->next_in, lzstr->avail_in);
lzstr->avail_in = 0;
}
m_lasterror = wxSTREAM_EOF;
}
break;
default:
wxLogError(_("Decompressing a lzma stream failed"));
m_lasterror = wxSTREAM_READ_ERROR;
}
bufsize -= lzstr->avail_out;
m_nBufferPos += bufsize;
return bufsize;
}
XzOutputStream::XzOutputStream(wxOutputStream& Stream, bool use_lzma1 /*= false*/) : wxFilterOutputStream(Stream)
{
wxCHECK_RET(LIBLZMA_LOADED, wxT("We shouldn't be here if liblzma isn't loaded!"));
lzma_easy_encoder = (dl_lzma_easy_encoder)(wxGetApp().GetLiblzma()->GetSymbol(wxT("lzma_easy_encoder")));
if (!lzma_easy_encoder) { wxLogWarning(wxT("Failed to load symbol 'lzma_easy_encoder'")); return; }
lzma_alone_encoder = (dl_lzma_alone_encoder)(wxGetApp().GetLiblzma()->GetSymbol(wxT("lzma_alone_encoder")));
if (!lzma_alone_encoder) { wxLogWarning(wxT("Failed to load symbol 'lzma_alone_encoder'")); return; }
lzma_lzma_preset = (dl_lzma_lzma_preset)(wxGetApp().GetLiblzma()->GetSymbol(wxT("lzma_lzma_preset")));
if (!lzma_lzma_preset) { wxLogWarning(wxT("Failed to load symbol 'lzma_lzma_preset'")); return; }
lzma_code = (dl_lzma_code)(wxGetApp().GetLiblzma()->GetSymbol(wxT("lzma_code")));
if (!lzma_code) { wxLogWarning(wxT("Failed to load symbol 'lzma_code'")); return; }
lzma_end = (dl_lzma_end)(wxGetApp().GetLiblzma()->GetSymbol(wxT("lzma_end")));
if (!lzma_end) { wxLogWarning(wxT("Failed to load symbol 'lzma_end'")); return; }
m_lzStream = (void*) new lzma_stream;
lzma_stream* lzstr = (lzma_stream*)m_lzStream;
memset(lzstr, 0, sizeof(lzma_stream)); // This is the recommended way of initialising a dynamically allocated lzma_stream
lzma_ret ret_xz;
if (!use_lzma1)
ret_xz = lzma_easy_encoder(lzstr, 6, LZMA_CHECK_CRC64);
else
{ lzma_options_lzma options;
lzma_lzma_preset(&options, 7);
ret_xz = lzma_alone_encoder(lzstr, &options);
}
if (ret_xz != LZMA_OK)
{ delete lzstr;
wxLogSysError(wxT("Could not initialize %s compression engine!"), use_lzma1 ? wxString(wxT("lzma1")).c_str():wxString(wxT("xz")).c_str());
}
}
XzOutputStream::~XzOutputStream()
{
lzma_stream* lzstr = (lzma_stream*)m_lzStream;
lzma_end(lzstr);
delete lzstr;
}
wxOutputStream& XzOutputStream::WriteRaw(void* pBuffer, size_t size)
{
return m_parent_o_stream->Write(pBuffer, size);
}
off_t XzOutputStream::TellRawO()
{
return m_parent_o_stream->TellO();
}
off_t XzOutputStream::SeekRawO(off_t pos, wxSeekMode sm)
{
return 0;
}
size_t XzOutputStream::OnSysWrite(const void* buffer, size_t bufsize)
{
// This is a clone of the xz compression example, xz_pipe_comp.c, adjusted for a wxOutputStream
lzma_stream* lzstr = (lzma_stream*)m_lzStream;
if (!lzstr)
m_lasterror = wxSTREAM_WRITE_ERROR;
if (!IsOk() || !bufsize)
return 0;
lzma_ret ret_xz = LZMA_OK;
lzstr->next_in = (uint8_t*)buffer;
lzstr->avail_in = bufsize;
do
{
lzstr->next_out = (uint8_t*)m_pBuffer;
lzstr->avail_out = OUT_BUF_MAX;
ret_xz = lzma_code(lzstr, LZMA_RUN);
if ((ret_xz != LZMA_OK) && (ret_xz != LZMA_STREAM_END))
{ m_lasterror = wxSTREAM_WRITE_ERROR;
wxLogError(_("xz compression failure"));
return false;
}
size_t out_len = OUT_BUF_MAX - lzstr->avail_out;
m_parent_o_stream->Write(m_pBuffer, out_len);
if (m_parent_o_stream->LastWrite() != out_len)
{ m_lasterror = wxSTREAM_WRITE_ERROR;
wxLogDebug(wxT("XzOutputStream: Error writing to underlying stream"));
break;
}
}
while (lzstr->avail_out == 0);
bufsize -= lzstr->avail_in;
m_nBufferPos += bufsize;
return bufsize;
}
bool XzOutputStream::Close() // Flushes any remaining compressed data
{
lzma_stream* lzstr = (lzma_stream*)m_lzStream;
if (!lzstr)
m_lasterror = wxSTREAM_WRITE_ERROR;
if (!IsOk())
return 0;
lzma_ret ret_xz = LZMA_OK;
lzstr->avail_in = 0;
do
{
lzstr->next_out = (uint8_t*)m_pBuffer;
lzstr->avail_out = OUT_BUF_MAX;
ret_xz = lzma_code(lzstr, LZMA_FINISH);
if ((ret_xz != LZMA_OK) && (ret_xz != LZMA_STREAM_END))
{ m_lasterror = wxSTREAM_WRITE_ERROR;
wxLogError(_("xz compression failure"));
return false;
}
size_t out_len = OUT_BUF_MAX - lzstr->avail_out;
m_parent_o_stream->Write(m_pBuffer, out_len);
if (m_parent_o_stream->LastWrite() != out_len)
{ m_lasterror = wxSTREAM_WRITE_ERROR;
wxLogDebug(wxT("XzOutputStream: Error writing to underlying stream"));
break;
}
}
while (lzstr->avail_out == 0);
return wxFilterOutputStream::Close() && IsOk();
}
//-----------------------------------------------------------------------------------------
IMPLEMENT_DYNAMIC_CLASS(XzClassFactory, wxFilterClassFactory)
static XzClassFactory g_XzClassFactory;
XzClassFactory::XzClassFactory()
{
if (this == &g_XzClassFactory)
PushFront();
}
const wxChar * const *
XzClassFactory::GetProtocols(wxStreamProtocolType type) const
{
static const wxChar *protos[] =
{ wxT("xz"), NULL };
static const wxChar *mimes[] =
{ wxT("a\application/x-xz"),
wxT("application/x-xz-compressed-tar"),
NULL };
static const wxChar *encs[] =
{ wxT("xz"), NULL };
static const wxChar *exts[] =
{ wxT(".xz"), NULL };
static const wxChar *empty[] =
{ NULL };
switch (type) {
case wxSTREAM_PROTOCOL: return protos;
case wxSTREAM_MIMETYPE: return mimes;
case wxSTREAM_ENCODING: return encs;
case wxSTREAM_FILEEXT: return exts;
default: return empty;
}
}
#endif // wxUSE_STREAMS
#endif // ndef NO_LZMA_ARCHIVE_STREAMS
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