void
wxMemoryInputStream::InitFromStream(wxInputStream& stream, wxFileOffset lenFile)
{
if ( lenFile == wxInvalidOffset )
lenFile = stream.GetLength();
if ( lenFile == wxInvalidOffset )
{
m_i_streambuf = NULL;
m_lasterror = wxSTREAM_EOF;
return;
}
const size_t len = wx_truncate_cast(size_t, lenFile);
wxASSERT_MSG( (wxFileOffset)len == lenFile, wxT("huge files not supported") );
m_i_streambuf = new wxStreamBuffer(wxStreamBuffer::read);
m_i_streambuf->SetBufferIO(len); // create buffer
stream.Read(m_i_streambuf->GetBufferStart(), len);
m_i_streambuf->SetIntPosition(0); // seek to start pos
m_i_streambuf->Fixed(true);
m_length = stream.LastRead();
}
bool wxAnimation::Load(wxInputStream &stream, wxAnimationType type)
{
UnRef();
char anim_type[12];
switch (type)
{
case wxANIMATION_TYPE_GIF:
strcpy(anim_type, "gif");
break;
case wxANIMATION_TYPE_ANI:
strcpy(anim_type, "ani");
break;
default:
anim_type[0] = '\0';
break;
}
// create a GdkPixbufLoader
GError *error = NULL;
GdkPixbufLoader *loader;
if (type != wxANIMATION_TYPE_INVALID && type != wxANIMATION_TYPE_ANY)
loader = gdk_pixbuf_loader_new_with_type(anim_type, &error);
else
loader = gdk_pixbuf_loader_new();
if (!loader)
{
wxLogDebug(wxT("Could not create the loader for '%s' animation type"), anim_type);
return false;
}
// connect to loader signals
g_signal_connect(loader, "area-updated", G_CALLBACK(gdk_pixbuf_area_updated), this);
guchar buf[2048];
while (stream.IsOk())
{
// read a chunk of data
stream.Read(buf, sizeof(buf));
// fetch all data into the loader
if (!gdk_pixbuf_loader_write(loader, buf, stream.LastRead(), &error))
{
gdk_pixbuf_loader_close(loader, &error);
wxLogDebug(wxT("Could not write to the loader"));
return false;
}
}
// load complete
if (!gdk_pixbuf_loader_close(loader, &error))
{
wxLogDebug(wxT("Could not close the loader"));
return false;
}
// wait until we get the last area_updated signal
return true;
}
bool wxSHA384::Hash(wxInputStream &input, wxSHA384Hash &hash)
{
// Get and verify the length of the stream
m_length = input.GetLength();
if((m_length == wxInvalidOffset) || (m_length == 0))
return false;
// Initialize H[0,..,7]
hash.H[0] = SHA384_INIT_0;
hash.H[1] = SHA384_INIT_1;
hash.H[2] = SHA384_INIT_2;
hash.H[3] = SHA384_INIT_3;
hash.H[4] = SHA384_INIT_4;
hash.H[5] = SHA384_INIT_5;
H6 = SHA384_INIT_6;
H7 = SHA384_INIT_7;
// Initialize data variables
m_readed = 0;
m_N = (m_length / SHA384_DATA_PAD_SPACE_1) + 1;
for(i = 0; i < m_N; i++)
{
// Initialize temporary HASH value
a = hash.H[0];
b = hash.H[1];
c = hash.H[2];
d = hash.H[3];
e = hash.H[4];
f = hash.H[5];
g = H6;
h = H7;
// First step SHA384 [0,..,15]
size_t t;
for(t = 0; t < 16; t++)
{
// Read data to W[t]
if((input.Read(&W[t], GetWSize()).LastRead() != GetWSize()) && ((m_length - m_readed) != input.LastRead()))
return false;
W[t] = wxUINT64_SWAP_ON_LE(W[t].GetValue());
// Wt = Mt(i)
M(t, input.LastRead());
m_readed += input.LastRead();
ComputeTempHash(t);
}
// Second step SHA384 [16,..,79]
for(; t < 80; t++)
{
W16_79(t);
ComputeTempHash(t);
}
// Update HASH
hash.H[0] += a;
hash.H[1] += b;
hash.H[2] += c;
hash.H[3] += d;
hash.H[4] += e;
hash.H[5] += f;
H6 += g;
H7 += h;
}
return true;
}
bool wxAnimation::Load(wxInputStream &stream, wxAnimationType type)
{
UnRef();
char anim_type[12];
switch (type)
{
case wxANIMATION_TYPE_GIF:
strcpy(anim_type, "gif");
break;
case wxANIMATION_TYPE_ANI:
strcpy(anim_type, "ani");
break;
default:
anim_type[0] = '\0';
break;
}
// create a GdkPixbufLoader
GError *error = NULL;
GdkPixbufLoader *loader;
if (type != wxANIMATION_TYPE_INVALID && type != wxANIMATION_TYPE_ANY)
loader = gdk_pixbuf_loader_new_with_type(anim_type, &error);
else
loader = gdk_pixbuf_loader_new();
if (!loader ||
error != NULL) // even if the loader was allocated, an error could have happened
{
wxLogDebug(wxT("Could not create the loader for '%s' animation type: %s"),
anim_type, error->message);
return false;
}
// connect to loader signals
g_signal_connect(loader, "area-updated", G_CALLBACK(gdk_pixbuf_area_updated), this);
guchar buf[2048];
bool data_written = false;
while (stream.IsOk())
{
// read a chunk of data
if (!stream.Read(buf, sizeof(buf)) &&
stream.GetLastError() != wxSTREAM_EOF) // EOF is OK for now
{
// gdk_pixbuf_loader_close wants the GError == NULL
gdk_pixbuf_loader_close(loader, NULL);
return false;
}
// fetch all data into the loader
if (!gdk_pixbuf_loader_write(loader, buf, stream.LastRead(), &error))
{
wxLogDebug(wxT("Could not write to the loader: %s"), error->message);
// gdk_pixbuf_loader_close wants the GError == NULL
gdk_pixbuf_loader_close(loader, NULL);
return false;
}
data_written = true;
}
if (!data_written)
{
wxLogDebug("Could not read data from the stream...");
return false;
}
// load complete: gdk_pixbuf_loader_close will now check if the data we
// wrote inside the pixbuf loader does make sense and will give an error
// if it doesn't (because of a truncated file, corrupted data or whatelse)
if (!gdk_pixbuf_loader_close(loader, &error))
{
wxLogDebug(wxT("Could not close the loader: %s"), error->message);
return false;
}
// wait until we get the last area_updated signal
return data_written;
}
/**
* Calculates the checksums from the given stream.
*
* @param in Input stream from which the data will be extracted to
* compute the checksum. The data are extracted until the end
* of the stream is reached.
* @param checksums Array of checksums to calculate.
* @param sumValues The calculated values of the checksums from the input
* stream. The array is erased first before adding results.
* On success <CODE>ArrayChecksum.GetCount() == sumValues.GetCount()</CODE>,
* on failure, <CODE>sumValues</CODE> should be empty.
* @return <UL>
* <LI><CODE>Ok</CODE> if the checksum has been successfully calculated.</Li>
* <LI><CODE>ReadError</CODE> if a read error has occured.</LI>
* <LI><CODE>Canceled</CODE> if the user has canceled the calculation.</LI>
* </UL>
*/
ChecksumCalculator::State ChecksumCalculator::calculate(wxInputStream& in,
const ArrayChecksum& checksums,
wxArrayString& sumValues)
{
// Check if the input stream is valid.
if (!in.IsOk())
return ReadError;
// Check if at least a checksum instance is OK.
bool aInstanceOK = false;
size_t i = 0;
size_t s = checksums.GetCount();
while (!aInstanceOK && i < s)
if (checksums[i] != NULL)
aInstanceOK = true;
else
i++;
if (!aInstanceOK)
return ReadError;
// Initializes the buffer.
const size_t bufSize = getBufferSize();
wxByte* buff = new wxByte[bufSize];
// Calculating the checksum.
ChecksumProgress* p = getChecksumProgress();
bool canceled = false;
size_t read;
wxStreamError lastError = wxSTREAM_NO_ERROR;
s = checksums.GetCount();
for (i = 0; i < s; i++)
if (checksums[i] != NULL)
checksums[i]->reset();
while (!canceled && !in.Eof() && lastError == wxSTREAM_NO_ERROR)
{
in.Read(buff, bufSize);
read = in.LastRead();
if (read > 0 && read <= bufSize)
{
for (i = 0; i < s; i++)
if (checksums[i] != NULL)
checksums[i]->update(buff, read);
if (p != NULL)
p->update(read, canceled);
}
lastError = in.GetLastError();
}
// Cleans-up the memory
delete[] buff;
if (canceled)
return CanceledByUser;
if (lastError != wxSTREAM_NO_ERROR && lastError != wxSTREAM_EOF)
return ReadError;
sumValues.Empty();
for (i = 0; i < s; i++)
if (checksums[i] != NULL)
sumValues.Add(checksums[i]->getValue());
else
sumValues.Add(wxEmptyString);
return Ok;
}