[wxWidgets.git] / tests / streams / largefile.cpp

///////////////////////////////////////////////////////////////////////////////
// Name:        tests/streams/largefile.cpp
// Purpose:     Tests for large file support
// Author:      Mike Wetherell
// RCS-ID:      $Id$
// Copyright:   (c) 2004 Mike Wetherell
// Licence:     wxWidgets licence
///////////////////////////////////////////////////////////////////////////////

//
// We're interested in what happens around offsets 0x7fffffff and 0xffffffff
// so the test writes a small chunk of test data just before and just after
// these offsets, then reads them back.
//
// The tests can be run with:
//
//  test --verbose largeFile
//
// On systems supporting sparse files they may also be registered in the
// Streams subsuite.
//

// For compilers that support precompilation, includes "wx/wx.h".
#include "testprec.h"

#ifdef __BORLANDC__
    #pragma hdrstop
#endif

// for all others, include the necessary headers
#ifndef WX_PRECOMP
    #include "wx/wx.h"
#endif

#include "wx/filename.h"
#include "wx/wfstream.h"

#ifdef __WXMSW__
#include "winioctl.h"
#endif

using std::auto_ptr;


///////////////////////////////////////////////////////////////////////////////
// Helpers

bool IsFAT(const wxString& path);
void MakeSparse(const wxString& path, int fd);


///////////////////////////////////////////////////////////////////////////////
// Base class for the test cases - common code

class LargeFileTest : public CppUnit::TestCase
{
public:
    LargeFileTest(std::string name) : CppUnit::TestCase(name) { }
    virtual ~LargeFileTest() { }

protected:
    void runTest();

    virtual wxInputStream *MakeInStream(const wxString& name) const = 0;
    virtual wxOutputStream *MakeOutStream(const wxString& name) const = 0;
    virtual bool HasLFS() const = 0;
};

void LargeFileTest::runTest()
{
    // self deleting temp file
    struct TmpFile {
        TmpFile() : m_name(wxFileName::CreateTempFileName(_T("wxlfs-"))) { }
        ~TmpFile() { if (!m_name.empty()) wxRemoveFile(m_name); }
        wxString m_name;
    } tmpfile;

    CPPUNIT_ASSERT(!tmpfile.m_name.empty());

    bool haveLFS = true;
    bool fourGigLimit = false;

    if (!HasLFS()) {
        haveLFS = false;
        wxString n(getName().c_str(), *wxConvCurrent);
        wxLogInfo(n + _T(": No large file support, testing up to 2GB only"));
    }
    else if (IsFAT(tmpfile.m_name)) {
        fourGigLimit = true;
        wxString n(getName().c_str(), *wxConvCurrent);
        wxLogInfo(n + _T(": FAT volumes are limited to 4GB files"));
    }

    // size of the test blocks
    const size_t size = 0x40;

    // the test blocks
    char upto2Gig[size];
    char past2Gig[size];
    char upto4Gig[size];
    char past4Gig[size];
    memset(upto2Gig, 'A', size);
    memset(past2Gig, 'B', size);
    memset(upto4Gig, 'X', size);
    memset(past4Gig, 'Y', size);

    wxFileOffset pos;

    // write a large file
    {
        auto_ptr<wxOutputStream> out(MakeOutStream(tmpfile.m_name));
        
        // write 'A's at [ 0x7fffffbf, 0x7fffffff [
        pos = 0x7fffffff - size;
        CPPUNIT_ASSERT(out->SeekO(pos) == pos);
        CPPUNIT_ASSERT(out->Write(upto2Gig, size).LastWrite() == size);
        pos += size;

        if (haveLFS) {
            // write 'B's at [ 0x7fffffff, 0x8000003f [
            CPPUNIT_ASSERT(out->Write(past2Gig, size).LastWrite() == size);
            pos += size;
            CPPUNIT_ASSERT(out->TellO() == pos);

            // write 'X's at [ 0xffffffbf, 0xffffffff [
            pos = 0xffffffff - size;
            CPPUNIT_ASSERT(out->SeekO(pos) == pos);
            CPPUNIT_ASSERT(out->Write(upto4Gig, size).LastWrite() == size);
            pos += size;

            if (!fourGigLimit) {
                // write 'Y's at [ 0xffffffff, 0x10000003f [
                CPPUNIT_ASSERT(out->Write(past4Gig, size).LastWrite() == size);
                pos += size;
            }
        }

        // check the file seems to be the right length
        CPPUNIT_ASSERT(out->TellO() == pos);
        CPPUNIT_ASSERT(out->GetLength() == pos);
    }

    // read the large file back
    {
        auto_ptr<wxInputStream> in(MakeInStream(tmpfile.m_name));
        char buf[size];

        if (haveLFS) {
            CPPUNIT_ASSERT(in->GetLength() == pos);
            pos = 0xffffffff;

            if (!fourGigLimit) {
                CPPUNIT_ASSERT(in->GetLength() > pos);

                // read back the 'Y's at [ 0xffffffff, 0x10000003f [
                CPPUNIT_ASSERT(in->SeekI(pos) == pos);
                CPPUNIT_ASSERT(in->Read(buf, size).LastRead() == size);
                CPPUNIT_ASSERT(memcmp(buf, past4Gig, size) == 0);

                CPPUNIT_ASSERT(in->TellI() == in->GetLength());
            }

            // read back the 'X's at [ 0xffffffbf, 0xffffffff [
            pos -= size;
            CPPUNIT_ASSERT(in->SeekI(pos) == pos);
            CPPUNIT_ASSERT(in->Read(buf, size).LastRead() == size);
            CPPUNIT_ASSERT(memcmp(buf, upto4Gig, size) == 0);
            pos += size;
            CPPUNIT_ASSERT(in->TellI() == pos);

            // read back the 'B's at [ 0x7fffffff, 0x8000003f [
            pos = 0x7fffffff;
            CPPUNIT_ASSERT(in->SeekI(pos) == pos);
            CPPUNIT_ASSERT(in->Read(buf, size).LastRead() == size);
            CPPUNIT_ASSERT(memcmp(buf, past2Gig, size) == 0);
        }
        else {
            CPPUNIT_ASSERT(in->GetLength() == 0x7fffffff);
            pos = 0x7fffffff;
        }

        // read back the 'A's at [ 0x7fffffbf, 0x7fffffff [
        pos -= size;
        CPPUNIT_ASSERT(in->SeekI(pos) == pos);
        CPPUNIT_ASSERT(in->Read(buf, size).LastRead() == size);
        CPPUNIT_ASSERT(memcmp(buf, upto2Gig, size) == 0);
        pos += size;
        CPPUNIT_ASSERT(in->TellI() == pos);
    }
}


///////////////////////////////////////////////////////////////////////////////
// wxFile test case

class LargeFileTest_wxFile : public LargeFileTest
{
public:
    LargeFileTest_wxFile() : LargeFileTest("wxFile streams") { }

protected:
    wxInputStream *MakeInStream(const wxString& name) const;
    wxOutputStream *MakeOutStream(const wxString& name) const;
    bool HasLFS() const { return (wxFileOffset)0xffffffff > 0; }
};

wxInputStream *LargeFileTest_wxFile::MakeInStream(const wxString& name) const
{
    auto_ptr<wxFileInputStream> in(new wxFileInputStream(name));
    CPPUNIT_ASSERT(in->Ok());
    return in.release();
}

wxOutputStream *LargeFileTest_wxFile::MakeOutStream(const wxString& name) const
{
    wxFile file(name, wxFile::write);
    CPPUNIT_ASSERT(file.IsOpened());
    int fd = file.fd();
    file.Detach();
    MakeSparse(name, fd);
    return new wxFileOutputStream(fd);
}


///////////////////////////////////////////////////////////////////////////////
// wxFFile test case

class LargeFileTest_wxFFile : public LargeFileTest
{
public:
    LargeFileTest_wxFFile() : LargeFileTest("wxFFile streams") { }

protected:
    wxInputStream *MakeInStream(const wxString& name) const;
    wxOutputStream *MakeOutStream(const wxString& name) const;
    bool HasLFS() const;
};

wxInputStream *LargeFileTest_wxFFile::MakeInStream(const wxString& name) const
{
    auto_ptr<wxFFileInputStream> in(new wxFFileInputStream(name));
    CPPUNIT_ASSERT(in->Ok());
    return in.release();
}

wxOutputStream *LargeFileTest_wxFFile::MakeOutStream(const wxString& name) const
{
    wxFFile file(name, _T("w"));
    CPPUNIT_ASSERT(file.IsOpened());
    FILE *fp = file.fp();
    file.Detach();
    MakeSparse(name, fileno(fp));
    return new wxFFileOutputStream(fp);
}

bool LargeFileTest_wxFFile::HasLFS() const
{
#ifdef HAVE_FSEEKO
    return (wxFileOffset)0xffffffff > 0;
#else
    return false;
#endif
}


///////////////////////////////////////////////////////////////////////////////
// The suite

class largeFile : public CppUnit::TestSuite
{
public:
    largeFile() : CppUnit::TestSuite("largeFile") { }

    static CppUnit::Test *suite();
};

CppUnit::Test *largeFile::suite()
{
    largeFile *suite = new largeFile;

    suite->addTest(new LargeFileTest_wxFile);
    suite->addTest(new LargeFileTest_wxFFile);

    return suite;
}


///////////////////////////////////////////////////////////////////////////////
// Implement the helpers
//
// Ideally these tests will be part of the default suite so that regressions
// are picked up. However this is only possible when sparse files are
// supported otherwise the tests require too much disk space.
//
// On unix, most filesystems support sparse files, though not all. So for now
// I'm not assuming sparse file support on unix. On Windows it's possible to
// test, and sparse files should be available on Win 5+ with NTFS.

#ifdef __WXMSW__

#ifndef FILE_SUPPORTS_SPARSE_FILES
#define FILE_SUPPORTS_SPARSE_FILES 0x00000040
#endif

#ifndef FSCTL_SET_SPARSE

#   ifndef FILE_SPECIAL_ACCESS 
#       define FILE_SPECIAL_ACCESS FILE_ANY_ACCESS
#   endif
#   define FSCTL_SET_SPARSE CTL_CODE(FILE_DEVICE_FILE_SYSTEM, 49, \
                                     METHOD_BUFFERED, FILE_SPECIAL_ACCESS)
#endif

static DWORD  volumeFlags;
static wxChar volumeType[64];
static bool   volumeInfoInit;

void GetVolumeInfo(const wxString& path)
{
    // extract the volume 'C:\' or '\\tooter\share\' from the path
    wxString vol;
    
    if (path.substr(1, 2) == _T(":\\")) {
        vol = path.substr(0, 3);
    } else {
        if (path.substr(0, 2) == _T("\\\\")) {
            size_t i = path.find(_T('\\'), 2);

            if (i != wxString::npos && i > 2) {
                size_t j = path.find(_T('\\'), ++i);

                if (j != i)
                    vol = path.substr(0, j) + _T("\\");
            }
        }
    }

    // NULL means the current volume
    const wxChar *pVol = vol.empty() ? NULL : vol.c_str();

    if (!::GetVolumeInformation(pVol, NULL, 0, NULL, NULL,
                                &volumeFlags, 
                                volumeType,
                                WXSIZEOF(volumeType)))
        wxLogSysError(_T("GetVolumeInformation() failed"));

    volumeInfoInit = true;
}

bool IsFAT(const wxString& path)
{
    if (!volumeInfoInit)
        GetVolumeInfo(path);
    return wxString(volumeType).Upper().find(_T("FAT")) != wxString::npos;
}

void MakeSparse(const wxString& path, int fd)
{
    DWORD cb;

    if (!volumeInfoInit)
        GetVolumeInfo(path);
   
    if ((volumeFlags & FILE_SUPPORTS_SPARSE_FILES) != 0)
        if (!::DeviceIoControl((HANDLE)_get_osfhandle(fd),
                               FSCTL_SET_SPARSE,
                               NULL, 0, NULL, 0, &cb, NULL))
            volumeFlags &= ~FILE_SUPPORTS_SPARSE_FILES;
}

CppUnit::Test* GetlargeFileSuite()
{
    if (!volumeInfoInit) {
        wxFile file;
        wxString path = wxFileName::CreateTempFileName(_T("wxlfs-"), &file);
        MakeSparse(path, file.fd());
        wxRemoveFile(path);
    }

    if ((volumeFlags & FILE_SUPPORTS_SPARSE_FILES) != 0)
        return largeFile::suite();
    else
        return NULL;
}

#else // __WXMSW__

bool IsFAT(const wxString& WXUNUSED(path)) { return false; }
void MakeSparse(const wxString& WXUNUSED(path), int WXUNUSED(fd)) { }

CppUnit::Test* GetlargeFileSuite() { return NULL; }

#endif // __WXMSW__

CPPUNIT_TEST_SUITE_NAMED_REGISTRATION(largeFile, "largeFile");
CPPUNIT_TEST_SUITE_NAMED_REGISTRATION(largeFile, "Streams.largeFile");
Commit	Line	Data
48714f74 RN	1	///////////////////////////////////////////////////////////////////////////////
	2	// Name: tests/streams/largefile.cpp
	3	// Purpose: Tests for large file support
	4	// Author: Mike Wetherell
	5	// RCS-ID: $Id$
	6	// Copyright: (c) 2004 Mike Wetherell
	7	// Licence: wxWidgets licence
	8	///////////////////////////////////////////////////////////////////////////////
	9
	10	//
086d7f31	11	// We're interested in what happens around offsets 0x7fffffff and 0xffffffff
48714f74 RN	12	// so the test writes a small chunk of test data just before and just after
	13	// these offsets, then reads them back.
	14	//
	15	// The tests can be run with:
	16	//
	17	// test --verbose largeFile
	18	//
	19	// On systems supporting sparse files they may also be registered in the
	20	// Streams subsuite.
	21	//
	22
	23	// For compilers that support precompilation, includes "wx/wx.h".
	24	#include "testprec.h"
	25
	26	#ifdef __BORLANDC__
	27	#pragma hdrstop
	28	#endif
	29
	30	// for all others, include the necessary headers
	31	#ifndef WX_PRECOMP
	32	#include "wx/wx.h"
	33	#endif
	34
	35	#include "wx/filename.h"
	36	#include "wx/wfstream.h"
	37
	38	#ifdef __WXMSW__
	39	#include "winioctl.h"
	40	#endif
	41
	42	using std::auto_ptr;
	43
	44
	45	///////////////////////////////////////////////////////////////////////////////
	46	// Helpers
	47
	48	bool IsFAT(const wxString& path);
	49	void MakeSparse(const wxString& path, int fd);
	50
	51
	52	///////////////////////////////////////////////////////////////////////////////
	53	// Base class for the test cases - common code
	54
	55	class LargeFileTest : public CppUnit::TestCase
	56	{
	57	public:
	58	LargeFileTest(std::string name) : CppUnit::TestCase(name) { }
	59	virtual ~LargeFileTest() { }
	60
	61	protected:
	62	void runTest();
	63
	64	virtual wxInputStream *MakeInStream(const wxString& name) const = 0;
	65	virtual wxOutputStream *MakeOutStream(const wxString& name) const = 0;
	66	virtual bool HasLFS() const = 0;
	67	};
	68
	69	void LargeFileTest::runTest()
	70	{
	71	// self deleting temp file
	72	struct TmpFile {
	73	TmpFile() : m_name(wxFileName::CreateTempFileName(_T("wxlfs-"))) { }
	74	~TmpFile() { if (!m_name.empty()) wxRemoveFile(m_name); }
	75	wxString m_name;
76	} tmpfile;
77
78	CPPUNIT_ASSERT(!tmpfile.m_name.empty());
79
80	bool haveLFS = true;
81	bool fourGigLimit = false;
82
83	if (!HasLFS()) {
84	haveLFS = false;
85	wxString n(getName().c_str(), *wxConvCurrent);
86	wxLogInfo(n + _T(": No large file support, testing up to 2GB only"));
87	}
88	else if (IsFAT(tmpfile.m_name)) {
89	fourGigLimit = true;
90	wxString n(getName().c_str(), *wxConvCurrent);
91	wxLogInfo(n + _T(": FAT volumes are limited to 4GB files"));
92	}
93
94	// size of the test blocks
95	const size_t size = 0x40;
96
97	// the test blocks
98	char upto2Gig[size];
99	char past2Gig[size];
100	char upto4Gig[size];
101	char past4Gig[size];
102	memset(upto2Gig, 'A', size);
103	memset(past2Gig, 'B', size);
104	memset(upto4Gig, 'X', size);
105	memset(past4Gig, 'Y', size);
106
107	wxFileOffset pos;
108
109	// write a large file
110	{
111	auto_ptr<wxOutputStream> out(MakeOutStream(tmpfile.m_name));
112
113	// write 'A's at [ 0x7fffffbf, 0x7fffffff [
114	pos = 0x7fffffff - size;
115	CPPUNIT_ASSERT(out->SeekO(pos) == pos);
116	CPPUNIT_ASSERT(out->Write(upto2Gig, size).LastWrite() == size);
117	pos += size;
118
119	if (haveLFS) {
120	// write 'B's at [ 0x7fffffff, 0x8000003f [
121	CPPUNIT_ASSERT(out->Write(past2Gig, size).LastWrite() == size);
122	pos += size;
123	CPPUNIT_ASSERT(out->TellO() == pos);
124
125	// write 'X's at [ 0xffffffbf, 0xffffffff [
126	pos = 0xffffffff - size;
127	CPPUNIT_ASSERT(out->SeekO(pos) == pos);
128	CPPUNIT_ASSERT(out->Write(upto4Gig, size).LastWrite() == size);
129	pos += size;
130
131	if (!fourGigLimit) {
132	// write 'Y's at [ 0xffffffff, 0x10000003f [
133	CPPUNIT_ASSERT(out->Write(past4Gig, size).LastWrite() == size);
134	pos += size;
135	}
136	}
137
138	// check the file seems to be the right length
139	CPPUNIT_ASSERT(out->TellO() == pos);
140	CPPUNIT_ASSERT(out->GetLength() == pos);
141	}
142
143	// read the large file back
144	{
145	auto_ptr<wxInputStream> in(MakeInStream(tmpfile.m_name));
146	char buf[size];
147
148	if (haveLFS) {
149	CPPUNIT_ASSERT(in->GetLength() == pos);
150	pos = 0xffffffff;
151
152	if (!fourGigLimit) {
153	CPPUNIT_ASSERT(in->GetLength() > pos);
154
155	// read back the 'Y's at [ 0xffffffff, 0x10000003f [
156	CPPUNIT_ASSERT(in->SeekI(pos) == pos);
157	CPPUNIT_ASSERT(in->Read(buf, size).LastRead() == size);
158	CPPUNIT_ASSERT(memcmp(buf, past4Gig, size) == 0);
159
160	CPPUNIT_ASSERT(in->TellI() == in->GetLength());
161	}
162
163	// read back the 'X's at [ 0xffffffbf, 0xffffffff [
164	pos -= size;
165	CPPUNIT_ASSERT(in->SeekI(pos) == pos);
166	CPPUNIT_ASSERT(in->Read(buf, size).LastRead() == size);
167	CPPUNIT_ASSERT(memcmp(buf, upto4Gig, size) == 0);
168	pos += size;
169	CPPUNIT_ASSERT(in->TellI() == pos);
170
171	// read back the 'B's at [ 0x7fffffff, 0x8000003f [
172	pos = 0x7fffffff;
173	CPPUNIT_ASSERT(in->SeekI(pos) == pos);
174	CPPUNIT_ASSERT(in->Read(buf, size).LastRead() == size);
175	CPPUNIT_ASSERT(memcmp(buf, past2Gig, size) == 0);
176	}
177	else {
178	CPPUNIT_ASSERT(in->GetLength() == 0x7fffffff);
179	pos = 0x7fffffff;
180	}
181
182	// read back the 'A's at [ 0x7fffffbf, 0x7fffffff [
183	pos -= size;
184	CPPUNIT_ASSERT(in->SeekI(pos) == pos);
185	CPPUNIT_ASSERT(in->Read(buf, size).LastRead() == size);
186	CPPUNIT_ASSERT(memcmp(buf, upto2Gig, size) == 0);
187	pos += size;
188	CPPUNIT_ASSERT(in->TellI() == pos);
189	}
190	}
191
192
193	///////////////////////////////////////////////////////////////////////////////
194	// wxFile test case
195
196	class LargeFileTest_wxFile : public LargeFileTest
197	{
198	public:
199	LargeFileTest_wxFile() : LargeFileTest("wxFile streams") { }
200
201	protected:
202	wxInputStream *MakeInStream(const wxString& name) const;
203	wxOutputStream *MakeOutStream(const wxString& name) const;
204	bool HasLFS() const { return (wxFileOffset)0xffffffff > 0; }
205	};
206
207	wxInputStream *LargeFileTest_wxFile::MakeInStream(const wxString& name) const
208	{
209	auto_ptr<wxFileInputStream> in(new wxFileInputStream(name));
210	CPPUNIT_ASSERT(in->Ok());
211	return in.release();
212	}
213
214	wxOutputStream *LargeFileTest_wxFile::MakeOutStream(const wxString& name) const
215	{
216	wxFile file(name, wxFile::write);
217	CPPUNIT_ASSERT(file.IsOpened());
218	int fd = file.fd();
219	file.Detach();
220	MakeSparse(name, fd);
221	return new wxFileOutputStream(fd);
222	}
223
224
225	///////////////////////////////////////////////////////////////////////////////
226	// wxFFile test case
227
228	class LargeFileTest_wxFFile : public LargeFileTest
229	{
230	public:
231	LargeFileTest_wxFFile() : LargeFileTest("wxFFile streams") { }
232
233	protected:
234	wxInputStream *MakeInStream(const wxString& name) const;
235	wxOutputStream *MakeOutStream(const wxString& name) const;
236	bool HasLFS() const;
237	};
238
239	wxInputStream *LargeFileTest_wxFFile::MakeInStream(const wxString& name) const
240	{
241	auto_ptr<wxFFileInputStream> in(new wxFFileInputStream(name));
242	CPPUNIT_ASSERT(in->Ok());
243	return in.release();
244	}
245
246	wxOutputStream *LargeFileTest_wxFFile::MakeOutStream(const wxString& name) const
247	{
248	wxFFile file(name, _T("w"));
249	CPPUNIT_ASSERT(file.IsOpened());
250	FILE *fp = file.fp();
251	file.Detach();
252	MakeSparse(name, fileno(fp));
253	return new wxFFileOutputStream(fp);
254	}
255
256	bool LargeFileTest_wxFFile::HasLFS() const
257	{
0c094518	258	#ifdef HAVE_FSEEKO
48714f74 RN	259	return (wxFileOffset)0xffffffff > 0;
	260	#else
	261	return false;
	262	#endif
	263	}
	264
	265
	266	///////////////////////////////////////////////////////////////////////////////
	267	// The suite
	268
	269	class largeFile : public CppUnit::TestSuite
	270	{
	271	public:
	272	largeFile() : CppUnit::TestSuite("largeFile") { }
	273
	274	static CppUnit::Test *suite();
	275	};
	276
	277	CppUnit::Test *largeFile::suite()
	278	{
	279	largeFile *suite = new largeFile;
	280
	281	suite->addTest(new LargeFileTest_wxFile);
	282	suite->addTest(new LargeFileTest_wxFFile);
	283
	284	return suite;
	285	}
	286
	287
	288	///////////////////////////////////////////////////////////////////////////////
	289	// Implement the helpers
	290	//
	291	// Ideally these tests will be part of the default suite so that regressions
	292	// are picked up. However this is only possible when sparse files are
	293	// supported otherwise the tests require too much disk space.
	294	//
086d7f31 RN	295	// On unix, most filesystems support sparse files, though not all. So for now
	296	// I'm not assuming sparse file support on unix. On Windows it's possible to
	297	// test, and sparse files should be available on Win 5+ with NTFS.
48714f74 RN	298
	299	#ifdef __WXMSW__
	300
	301	#ifndef FILE_SUPPORTS_SPARSE_FILES
	302	#define FILE_SUPPORTS_SPARSE_FILES 0x00000040
	303	#endif
	304
	305	#ifndef FSCTL_SET_SPARSE
	306
	307	# ifndef FILE_SPECIAL_ACCESS
	308	# define FILE_SPECIAL_ACCESS FILE_ANY_ACCESS
	309	# endif
	310	# define FSCTL_SET_SPARSE CTL_CODE(FILE_DEVICE_FILE_SYSTEM, 49, \
	311	METHOD_BUFFERED, FILE_SPECIAL_ACCESS)
	312	#endif
	313
	314	static DWORD volumeFlags;
	315	static wxChar volumeType[64];
	316	static bool volumeInfoInit;
	317
	318	void GetVolumeInfo(const wxString& path)
	319	{
	320	// extract the volume 'C:\' or '\\tooter\share\' from the path
	321	wxString vol;
	322
	323	if (path.substr(1, 2) == _T(":\\")) {
	324	vol = path.substr(0, 3);
	325	} else {
	326	if (path.substr(0, 2) == _T("\\\\")) {
	327	size_t i = path.find(_T('\\'), 2);
	328
	329	if (i != wxString::npos && i > 2) {
	330	size_t j = path.find(_T('\\'), ++i);
	331
	332	if (j != i)
	333	vol = path.substr(0, j) + _T("\\");
	334	}
	335	}
	336	}
	337
	338	// NULL means the current volume
	339	const wxChar *pVol = vol.empty() ? NULL : vol.c_str();
	340
	341	if (!::GetVolumeInformation(pVol, NULL, 0, NULL, NULL,
	342	&volumeFlags,
	343	volumeType,
	344	WXSIZEOF(volumeType)))
	345	wxLogSysError(_T("GetVolumeInformation() failed"));
	346
	347	volumeInfoInit = true;
	348	}
	349
	350	bool IsFAT(const wxString& path)
	351	{
	352	if (!volumeInfoInit)
	353	GetVolumeInfo(path);
	354	return wxString(volumeType).Upper().find(_T("FAT")) != wxString::npos;
	355	}
	356
	357	void MakeSparse(const wxString& path, int fd)
	358	{
	359	DWORD cb;
	360
	361	if (!volumeInfoInit)
362	GetVolumeInfo(path);
363
364	if ((volumeFlags & FILE_SUPPORTS_SPARSE_FILES) != 0)
365	if (!::DeviceIoControl((HANDLE)_get_osfhandle(fd),
366	FSCTL_SET_SPARSE,
367	NULL, 0, NULL, 0, &cb, NULL))
086d7f31	368	volumeFlags &= ~FILE_SUPPORTS_SPARSE_FILES;
48714f74 RN	369	}
	370
	371	CppUnit::Test* GetlargeFileSuite()
	372	{
	373	if (!volumeInfoInit) {
	374	wxFile file;
	375	wxString path = wxFileName::CreateTempFileName(_T("wxlfs-"), &file);
	376	MakeSparse(path, file.fd());
	377	wxRemoveFile(path);
	378	}
	379
	380	if ((volumeFlags & FILE_SUPPORTS_SPARSE_FILES) != 0)
	381	return largeFile::suite();
	382	else
	383	return NULL;
	384	}
	385
	386	#else // __WXMSW__
	387
	388	bool IsFAT(const wxString& WXUNUSED(path)) { return false; }
	389	void MakeSparse(const wxString& WXUNUSED(path), int WXUNUSED(fd)) { }
	390
48714f74	391	CppUnit::Test* GetlargeFileSuite() { return NULL; }
48714f74 RN	392
	393	#endif // __WXMSW__
	394
	395	CPPUNIT_TEST_SUITE_NAMED_REGISTRATION(largeFile, "largeFile");
	396	CPPUNIT_TEST_SUITE_NAMED_REGISTRATION(largeFile, "Streams.largeFile");