// Name: src/common/imagbmp.cpp
// Purpose: wxImage BMP,ICO and CUR handlers
// Author: Robert Roebling, Chris Elliott
-// RCS-ID: $Id$
// Copyright: (c) Robert Roebling, Chris Elliott
// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
// For memcpy
#include <string.h>
+// ----------------------------------------------------------------------------
+// private functions
+// ----------------------------------------------------------------------------
+
+#if wxUSE_ICO_CUR
+
+static bool CanReadICOOrCUR(wxInputStream *stream, wxUint16 resourceType);
+
+#endif // wxUSE_ICO_CUR
+
//-----------------------------------------------------------------------------
// wxBMPHandler
//-----------------------------------------------------------------------------
bool IsMask)
{
- wxCHECK_MSG( image, false, _T("invalid pointer in wxBMPHandler::SaveFile") );
+ wxCHECK_MSG( image, false, wxT("invalid pointer in wxBMPHandler::SaveFile") );
- if ( !image->Ok() )
+ if ( !image->IsOk() )
{
if ( verbose )
+ {
wxLogError(_("BMP: Couldn't save invalid image."));
+ }
return false;
}
)
{
if ( verbose )
+ {
wxLogError(_("BMP: wxImage doesn't have own wxPalette."));
+ }
return false;
}
bpp = 8;
}
unsigned width = image->GetWidth();
- unsigned row_padding = (4 - int(width*bpp/8.0) % 4) % 4; // # bytes to pad to dword
- unsigned row_width = int(width * bpp/8.0) + row_padding; // # of bytes per row
+ unsigned row_padding = (4 - ((width * bpp + 7) / 8) % 4) % 4; // # bytes to pad to dword
+ unsigned row_width = (width * bpp + 7) / 8 + row_padding; // # of bytes per row
struct
{
switch ( GetResolutionFromOptions(*image, &hres, &vres) )
{
default:
- wxFAIL_MSG( _T("unexpected image resolution units") );
+ wxFAIL_MSG( wxT("unexpected image resolution units") );
// fall through
case wxIMAGE_RESOLUTION_NONE:
if (// VS: looks ugly but compilers tend to do ugly things with structs,
// like aligning hdr.filesize's ofset to dword :(
// VZ: we should add padding then...
- !stream.Write(&hdr.magic, 2) ||
- !stream.Write(&hdr.filesize, 4) ||
- !stream.Write(&hdr.reserved, 4) ||
- !stream.Write(&hdr.data_offset, 4)
+ !stream.WriteAll(&hdr.magic, 2) ||
+ !stream.WriteAll(&hdr.filesize, 4) ||
+ !stream.WriteAll(&hdr.reserved, 4) ||
+ !stream.WriteAll(&hdr.data_offset, 4)
)
{
if (verbose)
+ {
wxLogError(_("BMP: Couldn't write the file (Bitmap) header."));
+ }
return false;
}
}
if ( !IsMask )
{
if (
- !stream.Write(&hdr.bih_size, 4) ||
- !stream.Write(&hdr.width, 4) ||
- !stream.Write(&hdr.height, 4) ||
- !stream.Write(&hdr.planes, 2) ||
- !stream.Write(&hdr.bpp, 2) ||
- !stream.Write(&hdr.compression, 4) ||
- !stream.Write(&hdr.size_of_bmp, 4) ||
- !stream.Write(&hdr.h_res, 4) ||
- !stream.Write(&hdr.v_res, 4) ||
- !stream.Write(&hdr.num_clrs, 4) ||
- !stream.Write(&hdr.num_signif_clrs, 4)
+ !stream.WriteAll(&hdr.bih_size, 4) ||
+ !stream.WriteAll(&hdr.width, 4) ||
+ !stream.WriteAll(&hdr.height, 4) ||
+ !stream.WriteAll(&hdr.planes, 2) ||
+ !stream.WriteAll(&hdr.bpp, 2) ||
+ !stream.WriteAll(&hdr.compression, 4) ||
+ !stream.WriteAll(&hdr.size_of_bmp, 4) ||
+ !stream.WriteAll(&hdr.h_res, 4) ||
+ !stream.WriteAll(&hdr.v_res, 4) ||
+ !stream.WriteAll(&hdr.num_clrs, 4) ||
+ !stream.WriteAll(&hdr.num_signif_clrs, 4)
)
{
if (verbose)
+ {
wxLogError(_("BMP: Couldn't write the file (BitmapInfo) header."));
+ }
return false;
}
}
{
if ( !IsMask )
{
- if ( !stream.Write(rgbquad, palette_size*4) )
+ if ( !stream.WriteAll(rgbquad, palette_size*4) )
{
if (verbose)
+ {
wxLogError(_("BMP: Couldn't write RGB color map."));
+ }
delete[] rgbquad;
#if wxUSE_PALETTE
delete palette;
// pointer to the image data, use quantized if available
wxUint8 *data = (wxUint8*) image->GetData();
- if (q_image) if (q_image->Ok()) data = (wxUint8*) q_image->GetData();
+ if (q_image) if (q_image->IsOk()) data = (wxUint8*) q_image->GetData();
wxUint8 *buffer = new wxUint8[row_width];
memset(buffer, 0, row_width);
}
}
- if ( !stream.Write(buffer, row_width) )
+ if ( !stream.WriteAll(buffer, row_width) )
{
if (verbose)
+ {
wxLogError(_("BMP: Couldn't write data."));
+ }
delete[] buffer;
#if wxUSE_PALETTE
delete palette;
if ( !cmap )
{
if (verbose)
+ {
wxLogError(_("BMP: Couldn't allocate memory."));
+ }
return false;
}
}
wxON_BLOCK_EXIT1(&BMPPalette::Free, cmap);
+ bool isUpsideDown = true;
+
+ if (height < 0)
+ {
+ isUpsideDown = false;
+ height = -height;
+ }
+
// destroy existing here instead of:
image->Destroy();
image->Create(width, height);
if ( !ptr )
{
if ( verbose )
+ {
wxLogError( _("BMP: Couldn't allocate memory.") );
+ }
return false;
}
if ( !alpha )
{
if ( verbose )
+ {
wxLogError(_("BMP: Couldn't allocate memory."));
+ }
return false;
}
}
{
if (hasPalette)
{
- stream.Read(bbuf, 4);
+ if ( !stream.ReadAll(bbuf, 4) )
+ return false;
+
cmap[j].b = bbuf[0];
cmap[j].g = bbuf[1];
cmap[j].r = bbuf[2];
{
if ( comp == BI_BITFIELDS )
{
- int bit = 0;
- stream.Read(dbuf, 4 * 3);
+ int bit;
+ if ( !stream.ReadAll(dbuf, 4 * 3) )
+ return false;
+
rmask = wxINT32_SWAP_ON_BE(dbuf[0]);
gmask = wxINT32_SWAP_ON_BE(dbuf[1]);
bmask = wxINT32_SWAP_ON_BE(dbuf[2]);
{
// NOTE: seeking a positive amount in wxFromCurrent mode allows us to
// load even non-seekable streams (see wxInputStream::SeekI docs)!
- if (stream.SeekI(bmpOffset, wxFromCurrent) == wxInvalidOffset)
+ const wxFileOffset pos = stream.TellI();
+ if ( pos == wxInvalidOffset ||
+ (bmpOffset > pos &&
+ stream.SeekI(bmpOffset - pos, wxFromCurrent) == wxInvalidOffset) )
return false;
//else: icon, just carry on
}
int linesize = ((width * bpp + 31) / 32) * 4;
- /* BMPs are stored upside down */
- for ( int line = (height - 1); line >= 0; line-- )
+ // flag indicating if we have any not fully transparent alpha values: this
+ // is used to account for the bitmaps which use 32bpp format (normally
+ // meaning that they have alpha channel) but have only zeroes in it so that
+ // without this hack they appear fully transparent -- and as this is
+ // unlikely intentional, we consider that they don't have alpha at all in
+ // this case (see #10915)
+ bool hasValidAlpha = false;
+
+ for ( int row = 0; row < height; row++ )
{
+ int line = isUpsideDown ? height - 1 - row : row;
+
int linepos = 0;
for ( int column = 0; column < width ; )
{
{
linepos++;
aByte = stream.GetC();
+ if ( !stream.IsOk() )
+ return false;
+
if ( bpp == 1 )
{
for (int bit = 0; bit < 8 && column < width; bit++)
wxUint8 first;
first = aByte;
aByte = stream.GetC();
+ if ( !stream.IsOk() )
+ return false;
+
if ( first == 0 )
{
if ( aByte == 0 )
{
- if ( column > 0 )
- column = width;
+ // end of scanline marker
+ column = width;
+ row--;
}
else if ( aByte == 1 )
{
+ // end of RLE data marker, stop decoding
column = width;
- line = -1;
+ row = height;
}
else if ( aByte == 2 )
{
+ // delta marker, move in image
aByte = stream.GetC();
+ if ( !stream.IsOk() )
+ return false;
column += aByte;
linepos = column * bpp / 4;
aByte = stream.GetC();
- line -= aByte; // upside down
+ if ( !stream.IsOk() )
+ return false;
+ row += aByte; // upside down
}
else
{
{
++readBytes ;
aByte = stream.GetC();
+ if ( !stream.IsOk() )
+ return false;
nibble[0] = (wxUint8)( (aByte & 0xF0) >> 4 ) ;
nibble[1] = (wxUint8)( aByte & 0x0F ) ;
}
linepos++;
}
if ( readBytes & 0x01 )
+ {
aByte = stream.GetC();
+ if ( !stream.IsOk() )
+ return false;
+ }
}
}
else
{
for (int nibble = 0; nibble < 2 && column < width; nibble++)
{
- int index = ((aByte & (0xF0 >> nibble * 4)) >> (!nibble * 4));
+ int index = ((aByte & (0xF0 >> (nibble * 4))) >> (!nibble * 4));
if ( index >= 16 )
index = 15;
ptr[poffset] = cmap[index].r;
unsigned char first;
first = aByte;
aByte = stream.GetC();
+ if ( !stream.IsOk() )
+ return false;
+
if ( first == 0 )
{
if ( aByte == 0 )
{
- /* column = width; */
+ // end of scanline marker
+ column = width;
+ row--;
}
else if ( aByte == 1 )
{
+ // end of RLE data marker, stop decoding
column = width;
- line = -1;
+ row = height;
}
else if ( aByte == 2 )
{
+ // delta marker, move in image
aByte = stream.GetC();
+ if ( !stream.IsOk() )
+ return false;
column += aByte;
linepos = column * bpp / 8;
aByte = stream.GetC();
- line += aByte;
+ if ( !stream.IsOk() )
+ return false;
+ row -= aByte;
}
else
{
{
linepos++;
aByte = stream.GetC();
+ if ( !stream.IsOk() )
+ return false;
ptr[poffset ] = cmap[aByte].r;
ptr[poffset + 1] = cmap[aByte].g;
ptr[poffset + 2] = cmap[aByte].b;
column++;
}
if ( absolute & 0x01 )
+ {
aByte = stream.GetC();
+ if ( !stream.IsOk() )
+ return false;
+ }
}
}
else
}
else if ( bpp == 24 )
{
- stream.Read(bbuf, 3);
+ if ( !stream.ReadAll(bbuf, 3) )
+ return false;
linepos += 3;
ptr[poffset ] = (unsigned char)bbuf[2];
ptr[poffset + 1] = (unsigned char)bbuf[1];
else if ( bpp == 16 )
{
unsigned char temp;
- stream.Read(&aWord, 2);
+ if ( !stream.ReadAll(&aWord, 2) )
+ return false;
aWord = wxUINT16_SWAP_ON_BE(aWord);
linepos += 2;
- /* use the masks and calculated amonut of shift
+ /* Use the masks and calculated amount of shift
to retrieve the color data out of the word. Then
shift it left by (8 - number of bits) such that
the image has the proper dynamic range */
- temp = (unsigned char)((aWord & rmask) >> rshift << (8-rbits));
+ temp = (unsigned char)(((aWord & rmask) >> rshift) << (8-rbits));
ptr[poffset] = temp;
- temp = (unsigned char)((aWord & gmask) >> gshift << (8-gbits));
+ temp = (unsigned char)(((aWord & gmask) >> gshift) << (8-gbits));
ptr[poffset + 1] = temp;
- temp = (unsigned char)((aWord & bmask) >> bshift << (8-bbits));
+ temp = (unsigned char)(((aWord & bmask) >> bshift) << (8-bbits));
ptr[poffset + 2] = temp;
column++;
}
else
{
unsigned char temp;
- stream.Read(&aDword, 4);
+ if ( !stream.ReadAll(&aDword, 4) )
+ return false;
+
aDword = wxINT32_SWAP_ON_BE(aDword);
linepos += 4;
temp = (unsigned char)((aDword & rmask) >> rshift);
{
temp = (unsigned char)((aDword & amask) >> ashift);
alpha[line * width + column] = temp;
+
+ if ( temp != wxALPHA_TRANSPARENT )
+ hasValidAlpha = true;
}
column++;
}
}
while ( (linepos < linesize) && (comp != 1) && (comp != 2) )
{
- stream.Read(&aByte, 1);
- linepos += 1;
- if ( !stream )
+ ++linepos;
+ if ( !stream.ReadAll(&aByte, 1) )
break;
}
}
image->SetMask(false);
+ // check if we had any valid alpha values in this bitmap
+ if ( alpha && !hasValidAlpha )
+ {
+ // we didn't, so finally discard the alpha channel completely
+ image->ClearAlpha();
+ }
+
const wxStreamError err = stream.GetLastError();
return err == wxSTREAM_NO_ERROR || err == wxSTREAM_EOF;
}
if ( IsBmp )
{
// read the header off the .BMP format file
- stream.Read(bbuf, 2);
- stream.Read(dbuf, 16);
+ if ( !stream.ReadAll(bbuf, 2) ||
+ !stream.ReadAll(dbuf, 16) )
+ return false;
}
else
{
- stream.Read(dbuf, 4);
+ if ( !stream.ReadAll(dbuf, 4) )
+ return false;
}
#if 0 // unused
wxInt32 size = wxINT32_SWAP_ON_BE(dbuf[0]);
#endif
wxFileOffset offset = wxINT32_SWAP_ON_BE(dbuf[2]);
- stream.Read(dbuf, 4 * 2);
+ if ( !stream.ReadAll(dbuf, 4 * 2) )
+ return false;
+
int width = wxINT32_SWAP_ON_BE((int)dbuf[0]);
int height = wxINT32_SWAP_ON_BE((int)dbuf[1]);
if ( !IsBmp)height = height / 2; // for icons divide by 2
if ( width > 32767 )
{
if (verbose)
+ {
wxLogError( _("DIB Header: Image width > 32767 pixels for file.") );
+ }
return false;
}
if ( height > 32767 )
{
if (verbose)
+ {
wxLogError( _("DIB Header: Image height > 32767 pixels for file.") );
+ }
return false;
}
- stream.Read(&aWord, 2);
+ if ( !stream.ReadAll(&aWord, 2) )
+ return false;
+
/*
TODO
int planes = (int)wxUINT16_SWAP_ON_BE( aWord );
*/
- stream.Read(&aWord, 2);
+ if ( !stream.ReadAll(&aWord, 2) )
+ return false;
+
int bpp = wxUINT16_SWAP_ON_BE((int)aWord);
if ( bpp != 1 && bpp != 4 && bpp != 8 && bpp != 16 && bpp != 24 && bpp != 32 )
{
if (verbose)
+ {
wxLogError( _("DIB Header: Unknown bitdepth in file.") );
+ }
return false;
}
- stream.Read(dbuf, 4 * 4);
+ if ( !stream.ReadAll(dbuf, 4 * 4) )
+ return false;
+
int comp = wxINT32_SWAP_ON_BE((int)dbuf[0]);
if ( comp != BI_RGB && comp != BI_RLE4 && comp != BI_RLE8 &&
comp != BI_BITFIELDS )
{
if (verbose)
+ {
wxLogError( _("DIB Header: Unknown encoding in file.") );
+ }
return false;
}
- stream.Read(dbuf, 4 * 2);
+ if ( !stream.ReadAll(dbuf, 4 * 2) )
+ return false;
int ncolors = wxINT32_SWAP_ON_BE( (int)dbuf[0] );
if (ncolors == 0)
((comp == BI_BITFIELDS) && (bpp != 16 && bpp != 32)))
{
if (verbose)
+ {
wxLogError( _("DIB Header: Encoding doesn't match bitdepth.") );
+ }
return false;
}
verbose, IsBmp, true) )
{
if (verbose)
+ {
wxLogError( _("Error in reading image DIB.") );
+ }
return false;
}
verbose, IsBmp, false) )
{
if (verbose)
+ {
wxLogError( _("ICO: Error in reading mask DIB.") );
+ }
return false;
}
image->SetMaskFromImage(mask, 255, 255, 255);
{
unsigned char hdr[2];
- if ( !stream.Read(hdr, WXSIZEOF(hdr)) ) // it's ok to modify the stream position here
+ if ( !stream.ReadAll(hdr, WXSIZEOF(hdr)) ) // it's ok to modify the stream position here
return false;
// do we have the BMP file signature?
if ( image->GetHeight () > 127 )
{
if ( verbose )
+ {
wxLogError(_("ICO: Image too tall for an icon."));
+ }
return false;
}
if ( image->GetWidth () > 255 )
{
if ( verbose )
+ {
wxLogError(_("ICO: Image too wide for an icon."));
+ }
return false;
}
IconDir.idReserved = 0;
IconDir.idType = wxUINT16_SWAP_ON_BE((wxUint16)type);
IconDir.idCount = wxUINT16_SWAP_ON_BE((wxUint16)images);
- stream.Write(&IconDir.idReserved, sizeof(IconDir.idReserved));
- stream.Write(&IconDir.idType, sizeof(IconDir.idType));
- stream.Write(&IconDir.idCount, sizeof(IconDir.idCount));
- if ( !stream.IsOk() )
+ if ( !stream.WriteAll(&IconDir.idReserved, sizeof(IconDir.idReserved)) ||
+ !stream.WriteAll(&IconDir.idType, sizeof(IconDir.idType)) ||
+ !stream.WriteAll(&IconDir.idCount, sizeof(IconDir.idCount)) )
{
if ( verbose )
+ {
wxLogError(_("ICO: Error writing the image file!"));
+ }
return false;
}
if ( !bResult )
{
if ( verbose )
+ {
wxLogError(_("ICO: Error writing the image file!"));
+ }
return false;
}
IsMask = true;
if ( !bResult )
{
if ( verbose )
+ {
wxLogError(_("ICO: Error writing the image file!"));
+ }
return false;
}
wxUint32 Size = cStream.GetSize();
// wxCountingOutputStream::IsOk() always returns true for now and this
// "if" provokes VC++ warnings in optimized build
#if 0
- if ( !cStream.Ok() )
+ if ( !cStream.IsOk() )
{
if ( verbose )
+ {
wxLogError(_("ICO: Error writing the image file!"));
+ }
return false;
}
#endif // 0
offset += Size;
// write to stream:
- stream.Write(&icondirentry.bWidth, sizeof(icondirentry.bWidth));
- stream.Write(&icondirentry.bHeight, sizeof(icondirentry.bHeight));
- stream.Write(&icondirentry.bColorCount, sizeof(icondirentry.bColorCount));
- stream.Write(&icondirentry.bReserved, sizeof(icondirentry.bReserved));
- stream.Write(&icondirentry.wPlanes, sizeof(icondirentry.wPlanes));
- stream.Write(&icondirentry.wBitCount, sizeof(icondirentry.wBitCount));
- stream.Write(&icondirentry.dwBytesInRes, sizeof(icondirentry.dwBytesInRes));
- stream.Write(&icondirentry.dwImageOffset, sizeof(icondirentry.dwImageOffset));
- if ( !stream.IsOk() )
+ if ( !stream.WriteAll(&icondirentry.bWidth, sizeof(icondirentry.bWidth)) ||
+ !stream.WriteAll(&icondirentry.bHeight, sizeof(icondirentry.bHeight)) ||
+ !stream.WriteAll(&icondirentry.bColorCount, sizeof(icondirentry.bColorCount)) ||
+ !stream.WriteAll(&icondirentry.bReserved, sizeof(icondirentry.bReserved)) ||
+ !stream.WriteAll(&icondirentry.wPlanes, sizeof(icondirentry.wPlanes)) ||
+ !stream.WriteAll(&icondirentry.wBitCount, sizeof(icondirentry.wBitCount)) ||
+ !stream.WriteAll(&icondirentry.dwBytesInRes, sizeof(icondirentry.dwBytesInRes)) ||
+ !stream.WriteAll(&icondirentry.dwImageOffset, sizeof(icondirentry.dwImageOffset)) )
{
if ( verbose )
+ {
wxLogError(_("ICO: Error writing the image file!"));
+ }
return false;
}
if ( !bResult )
{
if ( verbose )
+ {
wxLogError(_("ICO: Error writing the image file!"));
+ }
return false;
}
IsMask = true;
if ( !bResult )
{
if ( verbose )
+ {
wxLogError(_("ICO: Error writing the image file!"));
+ }
return false;
}
bool wxICOHandler::LoadFile(wxImage *image, wxInputStream& stream,
bool verbose, int index)
{
+ if ( stream.IsSeekable() && stream.SeekI(0) == wxInvalidOffset )
+ {
+ return false;
+ }
+
return DoLoadFile(image, stream, verbose, index);
}
ICONDIR IconDir;
- stream.Read(&IconDir, sizeof(IconDir));
+ if ( !stream.ReadAll(&IconDir, sizeof(IconDir)) )
+ return false;
+
wxUint16 nIcons = wxUINT16_SWAP_ON_BE(IconDir.idCount);
-
+
// nType is 1 for Icons, 2 for Cursors:
wxUint16 nType = wxUINT16_SWAP_ON_BE(IconDir.idType);
int iSel = wxNOT_FOUND;
// remember how many bytes we read from the stream:
- wxFileOffset offset = sizeof(IconDir);
-
+ wxFileOffset alreadySeeked = sizeof(IconDir);
+
for (unsigned int i = 0; i < nIcons; i++ )
{
- offset += stream.Read(pCurrentEntry, sizeof(ICONDIRENTRY)).LastRead();
-
+ if ( !stream.ReadAll(pCurrentEntry, sizeof(ICONDIRENTRY)) )
+ return false;
+
+ alreadySeeked += stream.LastRead();
+
// bHeight and bColorCount are wxUint8
if ( pCurrentEntry->bWidth >= wMax )
{
colmax = pCurrentEntry->bColorCount;
}
}
-
+
pCurrentEntry++;
}
{
// seek to selected icon:
pCurrentEntry = pIconDirEntry + iSel;
-
+
// NOTE: seeking a positive amount in wxFromCurrent mode allows us to
// load even non-seekable streams (see wxInputStream::SeekI docs)!
- if (stream.SeekI(wxUINT32_SWAP_ON_BE(pCurrentEntry->dwImageOffset) - offset,
- wxFromCurrent) == wxInvalidOffset)
+ wxFileOffset offset = wxUINT32_SWAP_ON_BE(pCurrentEntry->dwImageOffset) - alreadySeeked;
+ if (offset != 0 && stream.SeekI(offset, wxFromCurrent) == wxInvalidOffset)
return false;
-
+
bResult = LoadDib(image, stream, true, IsBmp);
bool bIsCursorType = (this->GetType() == wxBITMAP_TYPE_CUR) || (this->GetType() == wxBITMAP_TYPE_ANI);
if ( bResult && bIsCursorType && nType == 2 )
image->SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y, wxUINT16_SWAP_ON_BE(pCurrentEntry->wBitCount));
}
}
-
+
delete [] pIconDirEntry;
-
+
return bResult;
}
int wxICOHandler::DoGetImageCount(wxInputStream& stream)
{
+ // It's ok to modify the stream position in this function.
+
+ if ( stream.IsSeekable() && stream.SeekI(0) == wxInvalidOffset )
+ {
+ return 0;
+ }
+
ICONDIR IconDir;
- if (stream.Read(&IconDir, sizeof(IconDir)).LastRead() != sizeof(IconDir))
- // it's ok to modify the stream position here
+ if ( !stream.ReadAll(&IconDir, sizeof(IconDir)) )
return 0;
-
+
return (int)wxUINT16_SWAP_ON_BE(IconDir.idCount);
}
bool wxICOHandler::DoCanRead(wxInputStream& stream)
{
- unsigned char hdr[4];
- if ( !stream.Read(hdr, WXSIZEOF(hdr)) ) // it's ok to modify the stream position here
- return false;
+ return CanReadICOOrCUR(&stream, 1 /*for identifying an icon*/);
- // hdr[2] is one for an icon and two for a cursor
- return hdr[0] == '\0' && hdr[1] == '\0' && hdr[2] == '\1' && hdr[3] == '\0';
}
#endif // wxUSE_STREAMS
bool wxCURHandler::DoCanRead(wxInputStream& stream)
{
- unsigned char hdr[4];
- if ( !stream.Read(hdr, WXSIZEOF(hdr)) ) // it's ok to modify the stream position here
- return false;
-
- // hdr[2] is one for an icon and two for a cursor
- return hdr[0] == '\0' && hdr[1] == '\0' && hdr[2] == '\2' && hdr[3] == '\0';
+ return CanReadICOOrCUR(&stream, 2 /*for identifying a cursor*/);
}
#endif // wxUSE_STREAMS
return decoder.GetFrameCount();
}
+static bool CanReadICOOrCUR(wxInputStream *stream, wxUint16 resourceType)
+{
+ // It's ok to modify the stream position in this function.
+
+ if ( stream->IsSeekable() && stream->SeekI(0) == wxInvalidOffset )
+ {
+ return false;
+ }
+
+ ICONDIR iconDir;
+ if ( !stream->ReadAll(&iconDir, sizeof(iconDir)) )
+ {
+ return false;
+ }
+
+ return !iconDir.idReserved // reserved, must be 0
+ && wxUINT16_SWAP_ON_BE(iconDir.idType) == resourceType // either 1 or 2
+ && iconDir.idCount; // must contain at least one image
+}
+
#endif // wxUSE_STREAMS
#endif // wxUSE_ICO_CUR
projects / wxWidgets.git / blobdiff