X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/9ed0d735d588f42485461ea526596436c4c6ad4b..bf2c43c76e2819be443ab1d830ab68d9569d66b1:/src/common/imagbmp.cpp diff --git a/src/common/imagbmp.cpp b/src/common/imagbmp.cpp index ffe3162333..c3fcfb275e 100644 --- a/src/common/imagbmp.cpp +++ b/src/common/imagbmp.cpp @@ -1,50 +1,52 @@ ///////////////////////////////////////////////////////////////////////////// -// Name: imagbmp.cpp +// 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 ///////////////////////////////////////////////////////////////////////////// -#ifdef __GNUG__ -#pragma implementation "imagbmp.h" -#endif - // For compilers that support precompilation, includes "wx.h". #include "wx/wxprec.h" #ifdef __BORLANDC__ -#pragma hdrstop + #pragma hdrstop #endif -#include "wx/defs.h" - #if wxUSE_IMAGE #include "wx/imagbmp.h" -#include "wx/bitmap.h" -#include "wx/debug.h" -#include "wx/log.h" -#include "wx/app.h" + +#ifndef WX_PRECOMP + #ifdef __WXMSW__ + #include "wx/msw/wrapwin.h" + #endif + #include "wx/log.h" + #include "wx/app.h" + #include "wx/bitmap.h" + #include "wx/palette.h" + #include "wx/intl.h" + #include "wx/math.h" +#endif + #include "wx/filefn.h" #include "wx/wfstream.h" -#include "wx/intl.h" -#include "wx/module.h" #include "wx/quantize.h" +#include "wx/scopeguard.h" +#include "wx/anidecod.h" // For memcpy #include -#ifdef __SALFORDC__ -#ifdef FAR -#undef FAR -#endif -#endif +// ---------------------------------------------------------------------------- +// private functions +// ---------------------------------------------------------------------------- -#ifdef __WXMSW__ -#include "wx/msw/wrapwin.h" -#endif +#if wxUSE_ICO_CUR + +static bool CanReadICOOrCUR(wxInputStream *stream, wxUint16 resourceType); + +#endif // wxUSE_ICO_CUR //----------------------------------------------------------------------------- // wxBMPHandler @@ -55,8 +57,14 @@ IMPLEMENT_DYNAMIC_CLASS(wxBMPHandler,wxImageHandler) #if wxUSE_STREAMS #ifndef BI_RGB -#define BI_RGB 0 + #define BI_RGB 0 +#endif + +#ifndef BI_RLE8 #define BI_RLE8 1 +#endif + +#ifndef BI_RLE4 #define BI_RLE4 2 #endif @@ -70,7 +78,7 @@ bool wxBMPHandler::SaveFile(wxImage *image, wxOutputStream& stream, bool verbose) { - return SaveDib(image, stream, verbose, TRUE/*IsBmp*/, FALSE/*IsMask*/); + return SaveDib(image, stream, verbose, true/*IsBmp*/, false/*IsMask*/); } bool wxBMPHandler::SaveDib(wxImage *image, @@ -80,13 +88,15 @@ bool wxBMPHandler::SaveDib(wxImage *image, 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; + } + return false; } // get the format of the BMP file to save, else use 24bpp @@ -119,8 +129,10 @@ bool wxBMPHandler::SaveDib(wxImage *image, ) { if ( verbose ) + { wxLogError(_("BMP: wxImage doesn't have own wxPalette.")); - return FALSE; + } + return false; } bpp = 8; palette_size = 256; @@ -133,8 +145,8 @@ bool wxBMPHandler::SaveDib(wxImage *image, } 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 { @@ -151,7 +163,7 @@ bool wxBMPHandler::SaveDib(wxImage *image, wxUint16 bpp; // bits per pixel wxUint32 compression; // compression method wxUint32 size_of_bmp; // size of the bitmap - wxUint32 h_res, v_res; // image resolution in dpi + wxUint32 h_res, v_res; // image resolution in pixels-per-meter wxUint32 num_clrs; // number of colors used wxUint32 num_signif_clrs;// number of significant colors } hdr; @@ -178,7 +190,36 @@ bool wxBMPHandler::SaveDib(wxImage *image, hdr.bpp = wxUINT16_SWAP_ON_BE(bpp); hdr.compression = 0; // RGB uncompressed hdr.size_of_bmp = wxUINT32_SWAP_ON_BE(row_width * image->GetHeight()); - hdr.h_res = hdr.v_res = wxUINT32_SWAP_ON_BE(72); // 72dpi is standard + + // get the resolution from the image options or fall back to 72dpi standard + // for the BMP format if not specified + int hres, vres; + switch ( GetResolutionFromOptions(*image, &hres, &vres) ) + { + default: + wxFAIL_MSG( wxT("unexpected image resolution units") ); + // fall through + + case wxIMAGE_RESOLUTION_NONE: + hres = + vres = 72; + // fall through to convert it to correct units + + case wxIMAGE_RESOLUTION_INCHES: + // convert resolution in inches to resolution in centimeters + hres = (int)(10*mm2inches*hres); + vres = (int)(10*mm2inches*vres); + // fall through to convert it to resolution in meters + + case wxIMAGE_RESOLUTION_CM: + // convert resolution in centimeters to resolution in meters + hres *= 100; + vres *= 100; + break; + } + + hdr.h_res = wxUINT32_SWAP_ON_BE(hres); + hdr.v_res = wxUINT32_SWAP_ON_BE(vres); hdr.num_clrs = wxUINT32_SWAP_ON_BE(palette_size); // # colors in colormap hdr.num_signif_clrs = 0; // all colors are significant @@ -187,36 +228,40 @@ bool wxBMPHandler::SaveDib(wxImage *image, 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; + } + 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; + } + return false; } } @@ -267,16 +312,16 @@ bool wxBMPHandler::SaveDib(wxImage *image, else if ( (format == wxBMP_8BPP_GREY) || (format == wxBMP_8BPP_RED) || (format == wxBMP_1BPP_BW) ) { - int i; rgbquad = new wxUint8 [palette_size*4]; - for (i = 0; i < palette_size; i++) + for ( int i = 0; i < palette_size; i++ ) { - // if 1BPP_BW then just 0 and 255 then exit - if (( i > 0) && (format == wxBMP_1BPP_BW)) i = 255; - rgbquad[i*4] = i; - rgbquad[i*4+1] = i; - rgbquad[i*4+2] = i; + // if 1BPP_BW then the value should be either 0 or 255 + wxUint8 c = (wxUint8)((i > 0) && (format == wxBMP_1BPP_BW) ? 255 : i); + + rgbquad[i*4] = + rgbquad[i*4+1] = + rgbquad[i*4+2] = c; rgbquad[i*4+3] = 0; } } @@ -286,16 +331,18 @@ bool wxBMPHandler::SaveDib(wxImage *image, { 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; #endif // wxUSE_PALETTE delete q_image; - return FALSE; + return false; } } delete []rgbquad; @@ -303,7 +350,7 @@ bool wxBMPHandler::SaveDib(wxImage *image, // 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); @@ -330,9 +377,9 @@ bool wxBMPHandler::SaveDib(wxImage *image, { pixel = 3*(y*width + x); #if wxUSE_PALETTE - buffer[x] = palette->GetPixel( data[pixel], - data[pixel+1], - data[pixel+2] ); + buffer[x] = (wxUint8)palette->GetPixel( data[pixel], + data[pixel+1], + data[pixel+2] ); #else // FIXME: what should this be? use some std palette maybe? buffer[x] = 0; @@ -364,7 +411,7 @@ bool wxBMPHandler::SaveDib(wxImage *image, // fill buffer, ignore if > width #if wxUSE_PALETTE - buffer[x/2] = + buffer[x/2] = (wxUint8)( ((wxUint8)palette->GetPixel(data[pixel], data[pixel+1], data[pixel+2]) << 4) | @@ -372,7 +419,7 @@ bool wxBMPHandler::SaveDib(wxImage *image, ? 0 : ((wxUint8)palette->GetPixel(data[pixel+3], data[pixel+4], - data[pixel+5]) )); + data[pixel+5]) )) ); #else // FIXME: what should this be? use some std palette maybe? buffer[x/2] = 0; @@ -386,14 +433,15 @@ bool wxBMPHandler::SaveDib(wxImage *image, pixel = 3*(y*width + x); #if wxUSE_PALETTE - buffer[x/8] = ((wxUint8)palette->GetPixel(data[pixel], data[pixel+1], data[pixel+2]) << 7) | + buffer[x/8] = (wxUint8)( + ((wxUint8)palette->GetPixel(data[pixel], data[pixel+1], data[pixel+2]) << 7) | (((x+1) > width) ? 0 : ((wxUint8)palette->GetPixel(data[pixel+3], data[pixel+4], data[pixel+5]) << 6)) | (((x+2) > width) ? 0 : ((wxUint8)palette->GetPixel(data[pixel+6], data[pixel+7], data[pixel+8]) << 5)) | (((x+3) > width) ? 0 : ((wxUint8)palette->GetPixel(data[pixel+9], data[pixel+10], data[pixel+11]) << 4)) | (((x+4) > width) ? 0 : ((wxUint8)palette->GetPixel(data[pixel+12], data[pixel+13], data[pixel+14]) << 3)) | (((x+5) > width) ? 0 : ((wxUint8)palette->GetPixel(data[pixel+15], data[pixel+16], data[pixel+17]) << 2)) | (((x+6) > width) ? 0 : ((wxUint8)palette->GetPixel(data[pixel+18], data[pixel+19], data[pixel+20]) << 1)) | - (((x+7) > width) ? 0 : ((wxUint8)palette->GetPixel(data[pixel+21], data[pixel+22], data[pixel+23]) )); + (((x+7) > width) ? 0 : ((wxUint8)palette->GetPixel(data[pixel+21], data[pixel+22], data[pixel+23]) )) ); #else // FIXME: what should this be? use some std palette maybe? buffer[x/8] = 0; @@ -406,7 +454,7 @@ bool wxBMPHandler::SaveDib(wxImage *image, { pixel = 3*(y*width + x); - buffer[x/8] = + buffer[x/8] = (wxUint8)( (((wxUint8)(data[pixel] /128.)) << 7) | (((x+1) > width) ? 0 : (((wxUint8)(data[pixel+3] /128.)) << 6)) | (((x+2) > width) ? 0 : (((wxUint8)(data[pixel+6] /128.)) << 5)) | @@ -414,20 +462,22 @@ bool wxBMPHandler::SaveDib(wxImage *image, (((x+4) > width) ? 0 : (((wxUint8)(data[pixel+12]/128.)) << 3)) | (((x+5) > width) ? 0 : (((wxUint8)(data[pixel+15]/128.)) << 2)) | (((x+6) > width) ? 0 : (((wxUint8)(data[pixel+18]/128.)) << 1)) | - (((x+7) > width) ? 0 : (((wxUint8)(data[pixel+21]/128.)) )); + (((x+7) > width) ? 0 : (((wxUint8)(data[pixel+21]/128.)) )) ); } } - 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; #endif // wxUSE_PALETTE delete q_image; - return FALSE; + return false; } } delete[] buffer; @@ -436,22 +486,24 @@ bool wxBMPHandler::SaveDib(wxImage *image, #endif // wxUSE_PALETTE delete q_image; - return TRUE; + return true; } -typedef struct +struct BMPPalette { + static void Free(BMPPalette* pal) { delete [] pal; } + unsigned char r, g, b; -} _cmap; +}; bool wxBMPHandler::DoLoadDib(wxImage * image, int width, int height, int bpp, int ncolors, int comp, - off_t bmpOffset, wxInputStream& stream, + wxFileOffset bmpOffset, wxInputStream& stream, bool verbose, bool IsBmp, bool hasPalette) { - wxInt32 aDword, rmask = 0, gmask = 0, bmask = 0; - int rshift = 0, gshift = 0, bshift = 0; + wxInt32 aDword, rmask = 0, gmask = 0, bmask = 0, amask = 0; + int rshift = 0, gshift = 0, bshift = 0, ashift = 0; int rbits = 0, gbits = 0, bbits = 0; wxInt32 dbuf[4]; wxInt8 bbuf[4]; @@ -459,20 +511,34 @@ bool wxBMPHandler::DoLoadDib(wxImage * image, int width, int height, wxUint16 aWord; // allocate space for palette if needed: - _cmap *cmap = NULL; + BMPPalette *cmap; if ( bpp < 16 ) { - cmap = new _cmap[ncolors]; + cmap = new BMPPalette[ncolors]; if ( !cmap ) { if (verbose) + { wxLogError(_("BMP: Couldn't allocate memory.")); - return FALSE; + } + return false; } } - else + else // no palette + { cmap = NULL; + } + + wxON_BLOCK_EXIT1(&BMPPalette::Free, cmap); + + bool isUpsideDown = true; + + if (height < 0) + { + isUpsideDown = false; + height = -height; + } // destroy existing here instead of: image->Destroy(); @@ -483,10 +549,30 @@ bool wxBMPHandler::DoLoadDib(wxImage * image, int width, int height, if ( !ptr ) { if ( verbose ) + { wxLogError( _("BMP: Couldn't allocate memory.") ); - if ( cmap ) - delete[] cmap; - return FALSE; + } + return false; + } + + unsigned char *alpha; + if ( bpp == 32 ) + { + // tell the image to allocate an alpha buffer + image->SetAlpha(); + alpha = image->GetAlpha(); + if ( !alpha ) + { + if ( verbose ) + { + wxLogError(_("BMP: Couldn't allocate memory.")); + } + return false; + } + } + else // no alpha + { + alpha = NULL; } // Reading the palette, if it exists: @@ -499,7 +585,9 @@ bool wxBMPHandler::DoLoadDib(wxImage * image, int width, int height, { 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]; @@ -511,9 +599,9 @@ bool wxBMPHandler::DoLoadDib(wxImage * image, int width, int height, else { //used in reading .ico file mask - r[j] = cmap[j].r = j * 255; - g[j] = cmap[j].g = j * 255; - b[j] = cmap[j].b = j * 255; + r[j] = cmap[j].r = + g[j] = cmap[j].g = + b[j] = cmap[j].b = ( j ? 255 : 0 ); } } @@ -530,8 +618,10 @@ bool wxBMPHandler::DoLoadDib(wxImage * image, int width, int height, { 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]); @@ -573,6 +663,9 @@ bool wxBMPHandler::DoLoadDib(wxImage * image, int width, int height, rmask = 0x00FF0000; gmask = 0x0000FF00; bmask = 0x000000FF; + amask = 0xFF000000; + + ashift = 24; rshift = 16; gshift = 8; bshift = 0; @@ -586,7 +679,16 @@ bool wxBMPHandler::DoLoadDib(wxImage * image, int width, int height, * Reading the image data */ if ( IsBmp ) - stream.SeekI(bmpOffset); // else icon, just carry on + { + // NOTE: seeking a positive amount in wxFromCurrent mode allows us to + // load even non-seekable streams (see wxInputStream::SeekI docs)! + const wxFileOffset pos = stream.TellI(); + if ( pos == wxInvalidOffset || + (bmpOffset > pos && + stream.SeekI(bmpOffset - pos, wxFromCurrent) == wxInvalidOffset) ) + return false; + //else: icon, just carry on + } unsigned char *data = ptr; @@ -602,27 +704,35 @@ bool wxBMPHandler::DoLoadDib(wxImage * image, int width, int height, ptr = data; } - int line = 0; - int column = 0; int linesize = ((width * bpp + 31) / 32) * 4; - /* BMPs are stored upside down */ - for ( 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 ( column = 0; column < width ; ) + for ( int column = 0; column < width ; ) { if ( bpp < 16 ) { - int index = 0; linepos++; aByte = stream.GetC(); + if ( !stream.IsOk() ) + return false; + if ( bpp == 1 ) { - int bit = 0; - for (bit = 0; bit < 8 && column < width; bit++) + for (int bit = 0; bit < 8 && column < width; bit++) { - index = ((aByte & (0x80 >> bit)) ? 1 : 0); + int index = ((aByte & (0x80 >> bit)) ? 1 : 0); ptr[poffset] = cmap[index].r; ptr[poffset + 1] = cmap[index].g; ptr[poffset + 2] = cmap[index].b; @@ -636,25 +746,35 @@ bool wxBMPHandler::DoLoadDib(wxImage * image, int width, int height, 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 { @@ -667,8 +787,10 @@ bool wxBMPHandler::DoLoadDib(wxImage * image, int width, int height, { ++readBytes ; aByte = stream.GetC(); - nibble[0] = ( (aByte & 0xF0) >> 4 ) ; - nibble[1] = ( aByte & 0x0F ) ; + if ( !stream.IsOk() ) + return false; + nibble[0] = (wxUint8)( (aByte & 0xF0) >> 4 ) ; + nibble[1] = (wxUint8)( aByte & 0x0F ) ; } ptr[poffset ] = cmap[nibble[k%2]].r; ptr[poffset + 1] = cmap[nibble[k%2]].g; @@ -678,14 +800,18 @@ bool wxBMPHandler::DoLoadDib(wxImage * image, int width, int height, linepos++; } if ( readBytes & 0x01 ) + { aByte = stream.GetC(); + if ( !stream.IsOk() ) + return false; + } } } else { wxUint8 nibble[2] ; - nibble[0] = ( (aByte & 0xF0) >> 4 ) ; - nibble[1] = ( aByte & 0x0F ) ; + nibble[0] = (wxUint8)( (aByte & 0xF0) >> 4 ) ; + nibble[1] = (wxUint8)( aByte & 0x0F ) ; for ( int l = 0; l < first && column < width; l++ ) { @@ -700,10 +826,9 @@ bool wxBMPHandler::DoLoadDib(wxImage * image, int width, int height, } else { - int nibble = 0; - for (nibble = 0; nibble < 2 && column < width; nibble++) + for (int nibble = 0; nibble < 2 && column < width; nibble++) { - 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; @@ -720,24 +845,35 @@ bool wxBMPHandler::DoLoadDib(wxImage * image, int width, int height, 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 { @@ -746,13 +882,19 @@ bool wxBMPHandler::DoLoadDib(wxImage * image, int width, int height, { 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 @@ -779,7 +921,8 @@ bool wxBMPHandler::DoLoadDib(wxImage * image, int width, int height, } 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]; @@ -789,48 +932,63 @@ bool wxBMPHandler::DoLoadDib(wxImage * image, int width, int height, 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 = (aWord & rmask) >> rshift << (8-rbits); + temp = (unsigned char)(((aWord & rmask) >> rshift) << (8-rbits)); ptr[poffset] = temp; - temp = (aWord & gmask) >> gshift << (8-gbits); + temp = (unsigned char)(((aWord & gmask) >> gshift) << (8-gbits)); ptr[poffset + 1] = temp; - temp = (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 = (aDword & rmask) >> rshift; + temp = (unsigned char)((aDword & rmask) >> rshift); ptr[poffset] = temp; - temp = (aDword & gmask) >> gshift; + temp = (unsigned char)((aDword & gmask) >> gshift); ptr[poffset + 1] = temp; - temp = (aDword & bmask) >> bshift; + temp = (unsigned char)((aDword & bmask) >> bshift); ptr[poffset + 2] = temp; + if ( alpha ) + { + 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; } } - delete[] cmap; + image->SetMask(false); - 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; @@ -842,72 +1000,86 @@ bool wxBMPHandler::LoadDib(wxImage *image, wxInputStream& stream, wxUint16 aWord; wxInt32 dbuf[4]; wxInt8 bbuf[4]; - off_t offset; - offset = 0; // keep gcc quiet if ( IsBmp ) { // read the header off the .BMP format file - - offset = stream.TellI(); - if (offset == wxInvalidOffset) offset = 0; - - 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 - offset = offset + wxINT32_SWAP_ON_BE(dbuf[2]); + wxFileOffset offset = wxINT32_SWAP_ON_BE(dbuf[2]); - stream.Read(dbuf, 4 * 2); - int width = (int)wxINT32_SWAP_ON_BE(dbuf[0]); - int height = (int)wxINT32_SWAP_ON_BE(dbuf[1]); + 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; + } + return false; } if ( height > 32767 ) { if (verbose) + { wxLogError( _("DIB Header: Image height > 32767 pixels for file.") ); - return FALSE; + } + 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); - int bpp = (int)wxUINT16_SWAP_ON_BE(aWord); + 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; + } + return false; } - stream.Read(dbuf, 4 * 4); - int comp = (int)wxINT32_SWAP_ON_BE(dbuf[0]); + 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; + } + return false; } - stream.Read(dbuf, 4 * 2); - int ncolors = (int)wxINT32_SWAP_ON_BE( dbuf[0] ); + if ( !stream.ReadAll(dbuf, 4 * 2) ) + return false; + + int ncolors = wxINT32_SWAP_ON_BE( (int)dbuf[0] ); if (ncolors == 0) ncolors = 1 << bpp; /* some more sanity checks */ @@ -916,17 +1088,21 @@ bool wxBMPHandler::LoadDib(wxImage *image, wxInputStream& stream, ((comp == BI_BITFIELDS) && (bpp != 16 && bpp != 32))) { if (verbose) + { wxLogError( _("DIB Header: Encoding doesn't match bitdepth.") ); - return FALSE; + } + return false; } //read DIB; this is the BMP image or the XOR part of an icon image if ( !DoLoadDib(image, width, height, bpp, ncolors, comp, offset, stream, - verbose, IsBmp, TRUE) ) + verbose, IsBmp, true) ) { if (verbose) - wxLogError( _("Error in reading image DIB .") ); - return FALSE; + { + wxLogError( _("Error in reading image DIB.") ); + } + return false; } if ( !IsBmp ) @@ -935,32 +1111,39 @@ bool wxBMPHandler::LoadDib(wxImage *image, wxInputStream& stream, //there is no palette, so we will create one wxImage mask; if ( !DoLoadDib(&mask, width, height, 1, 2, BI_RGB, offset, stream, - verbose, IsBmp, FALSE) ) + verbose, IsBmp, false) ) { if (verbose) + { wxLogError( _("ICO: Error in reading mask DIB.") ); - return FALSE; + } + return false; } image->SetMaskFromImage(mask, 255, 255, 255); } - return TRUE; + // the resolution in the bitmap header is in meters, convert to centimeters + image->SetOption(wxIMAGE_OPTION_RESOLUTIONUNIT, wxIMAGE_RESOLUTION_CM); + image->SetOption(wxIMAGE_OPTION_RESOLUTIONX, dbuf[2]/100); + image->SetOption(wxIMAGE_OPTION_RESOLUTIONY, dbuf[3]/100); + + return true; } bool wxBMPHandler::LoadFile(wxImage *image, wxInputStream& stream, bool verbose, int WXUNUSED(index)) { // Read a single DIB fom the file: - return LoadDib(image, stream, verbose, TRUE/*isBmp*/); + return LoadDib(image, stream, verbose, true/*isBmp*/); } bool wxBMPHandler::DoCanRead(wxInputStream& stream) { unsigned char hdr[2]; - if ( !stream.Read(hdr, WXSIZEOF(hdr)) ) - return FALSE; + if ( !stream.ReadAll(hdr, WXSIZEOF(hdr)) ) // it's ok to modify the stream position here + return false; // do we have the BMP file signature? return hdr[0] == 'B' && hdr[1] == 'M'; @@ -1007,22 +1190,25 @@ bool wxICOHandler::SaveFile(wxImage *image, bool verbose) { - bool bResult = FALSE; //sanity check; icon must be less than 127 pixels high and 255 wide if ( image->GetHeight () > 127 ) { if ( verbose ) + { wxLogError(_("ICO: Image too tall for an icon.")); - return FALSE; + } + return false; } if ( image->GetWidth () > 255 ) { if ( verbose ) + { wxLogError(_("ICO: Image too wide for an icon.")); - return FALSE; + } + return false; } - int images = 1; // only generate one image + const int images = 1; // only generate one image // VS: This is a hack of sort - since ICO and CUR files are almost // identical, we have all the meat in wxICOHandler and check for @@ -1036,21 +1222,22 @@ bool wxICOHandler::SaveFile(wxImage *image, ICONDIR IconDir; IconDir.idReserved = 0; - IconDir.idType = wxUINT16_SWAP_ON_BE(type); - IconDir.idCount = wxUINT16_SWAP_ON_BE(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() ) + IconDir.idType = wxUINT16_SWAP_ON_BE((wxUint16)type); + IconDir.idCount = wxUINT16_SWAP_ON_BE((wxUint16)images); + 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; + } + return false; } // for each iamage write a description ICONDIRENTRY: ICONDIRENTRY icondirentry; - for (int i = 0; i < images; i++) + for (int img = 0; img < images; img++) { wxImage mask; @@ -1094,44 +1281,50 @@ bool wxICOHandler::SaveFile(wxImage *image, // monochome bitmap: mask.SetOption(wxIMAGE_OPTION_BMP_FORMAT, wxBMP_1BPP_BW); - bool IsBmp = FALSE; - bool IsMask = FALSE; + bool IsBmp = false; + bool IsMask = false; //calculate size and offset of image and mask wxCountingOutputStream cStream; - bResult = SaveDib(image, cStream, verbose, IsBmp, IsMask); + bool bResult = SaveDib(image, cStream, verbose, IsBmp, IsMask); if ( !bResult ) { if ( verbose ) + { wxLogError(_("ICO: Error writing the image file!")); - return FALSE; + } + return false; } - IsMask = TRUE; + IsMask = true; bResult = SaveDib(&mask, cStream, verbose, IsBmp, IsMask); if ( !bResult ) { if ( verbose ) + { wxLogError(_("ICO: Error writing the image file!")); - return FALSE; + } + return false; } wxUint32 Size = cStream.GetSize(); - // wxCountingOutputStream::Ok() always returns TRUE for now and this + // 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; + } + return false; } #endif // 0 offset = offset + sizeof(ICONDIRENTRY); - icondirentry.bWidth = image->GetWidth(); - icondirentry.bHeight = 2 * image->GetHeight(); + icondirentry.bWidth = (wxUint8)image->GetWidth(); + icondirentry.bHeight = (wxUint8)(2 * image->GetHeight()); icondirentry.bColorCount = 0; icondirentry.bReserved = 0; icondirentry.wPlanes = wxUINT16_SWAP_ON_BE(1); @@ -1156,63 +1349,74 @@ bool wxICOHandler::SaveFile(wxImage *image, 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; + } + return false; } // actually save it: - IsMask = FALSE; + IsMask = false; bResult = SaveDib(image, stream, verbose, IsBmp, IsMask); if ( !bResult ) { if ( verbose ) + { wxLogError(_("ICO: Error writing the image file!")); - return FALSE; + } + return false; } - IsMask = TRUE; + IsMask = true; bResult = SaveDib(&mask, stream, verbose, IsBmp, IsMask); if ( !bResult ) { if ( verbose ) + { wxLogError(_("ICO: Error writing the image file!")); - return FALSE; + } + return false; } } // end of for loop - return TRUE; + return true; } bool wxICOHandler::LoadFile(wxImage *image, wxInputStream& stream, bool verbose, int index) { - stream.SeekI(0); + if ( stream.IsSeekable() && stream.SeekI(0) == wxInvalidOffset ) + { + return false; + } + return DoLoadFile(image, stream, verbose, index); } bool wxICOHandler::DoLoadFile(wxImage *image, wxInputStream& stream, bool WXUNUSED(verbose), int index) { - bool bResult = FALSE; - bool IsBmp = FALSE; + bool bResult wxDUMMY_INITIALIZE(false); + bool IsBmp = false; ICONDIR IconDir; - off_t iPos = stream.TellI(); - 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); @@ -1223,9 +1427,16 @@ bool wxICOHandler::DoLoadFile(wxImage *image, wxInputStream& stream, int colmax = 0; int iSel = wxNOT_FOUND; - for (int i = 0; i < nIcons; i++ ) + // remember how many bytes we read from the stream: + wxFileOffset alreadySeeked = sizeof(IconDir); + + for (unsigned int i = 0; i < nIcons; i++ ) { - stream.Read(pCurrentEntry, sizeof(ICONDIRENTRY)); + if ( !stream.ReadAll(pCurrentEntry, sizeof(ICONDIRENTRY)) ) + return false; + + alreadySeeked += stream.LastRead(); + // bHeight and bColorCount are wxUint8 if ( pCurrentEntry->bWidth >= wMax ) { @@ -1239,6 +1450,7 @@ bool wxICOHandler::DoLoadFile(wxImage *image, wxInputStream& stream, colmax = pCurrentEntry->bColorCount; } } + pCurrentEntry++; } @@ -1252,14 +1464,20 @@ bool wxICOHandler::DoLoadFile(wxImage *image, wxInputStream& stream, if ( iSel == wxNOT_FOUND || iSel < 0 || iSel >= nIcons ) { wxLogError(_("ICO: Invalid icon index.")); - bResult = FALSE; + bResult = false; } else { // seek to selected icon: pCurrentEntry = pIconDirEntry + iSel; - stream.SeekI(iPos + wxUINT32_SWAP_ON_BE(pCurrentEntry->dwImageOffset), wxFromStart); - bResult = LoadDib(image, stream, TRUE, IsBmp); + + // NOTE: seeking a positive amount in wxFromCurrent mode allows us to + // load even non-seekable streams (see wxInputStream::SeekI docs)! + 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 ) { @@ -1268,30 +1486,33 @@ bool wxICOHandler::DoLoadFile(wxImage *image, wxInputStream& stream, image->SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y, wxUINT16_SWAP_ON_BE(pCurrentEntry->wBitCount)); } } - delete[] pIconDirEntry; + + delete [] pIconDirEntry; + return bResult; } -int wxICOHandler::GetImageCount(wxInputStream& stream) +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; - off_t iPos = stream.TellI(); - stream.SeekI(0); - stream.Read(&IconDir, sizeof(IconDir)); - wxUint16 nIcons = wxUINT16_SWAP_ON_BE(IconDir.idCount); - stream.SeekI(iPos); - return (int)nIcons; + + if ( !stream.ReadAll(&IconDir, sizeof(IconDir)) ) + return 0; + + return (int)wxUINT16_SWAP_ON_BE(IconDir.idCount); } bool wxICOHandler::DoCanRead(wxInputStream& stream) { - stream.SeekI(0); - unsigned char hdr[4]; - if ( !stream.Read(hdr, WXSIZEOF(hdr)) ) - 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 @@ -1307,13 +1528,7 @@ IMPLEMENT_DYNAMIC_CLASS(wxCURHandler, wxICOHandler) bool wxCURHandler::DoCanRead(wxInputStream& stream) { - stream.SeekI(0); - unsigned char hdr[4]; - if ( !stream.Read(hdr, WXSIZEOF(hdr)) ) - 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 @@ -1327,160 +1542,49 @@ IMPLEMENT_DYNAMIC_CLASS(wxANIHandler, wxCURHandler) #if wxUSE_STREAMS bool wxANIHandler::LoadFile(wxImage *image, wxInputStream& stream, - bool verbose, int index) + bool WXUNUSED(verbose), int index) { - wxInt32 FCC1, FCC2; - wxUint32 datalen; - - wxInt32 riff32; - memcpy( &riff32, "RIFF", 4 ); - wxInt32 list32; - memcpy( &list32, "LIST", 4 ); - wxInt32 ico32; - memcpy( &ico32, "icon", 4 ); - int iIcon = 0; - - stream.SeekI(0); - stream.Read(&FCC1, 4); - if ( FCC1 != riff32 ) - return FALSE; - - // we have a riff file: - while (stream.IsOk()) - { - // we always have a data size - stream.Read(&datalen, 4); - datalen = wxINT32_SWAP_ON_BE(datalen) ; - //data should be padded to make even number of bytes - if (datalen % 2 == 1) datalen ++ ; - //now either data or a FCC - if ( (FCC1 == riff32) || (FCC1 == list32) ) - { - stream.Read(&FCC2, 4); - } - else - { - if (FCC1 == ico32 && iIcon >= index) - { - return DoLoadFile(image, stream, verbose, -1); - } - else - { - stream.SeekI(stream.TellI() + datalen); - if ( FCC1 == ico32 ) - iIcon ++; - } - } + wxANIDecoder decoder; + if (!decoder.Load(stream)) + return false; - // try to read next data chunk: - stream.Read(&FCC1, 4); - } - return FALSE; + return decoder.ConvertToImage(index != -1 ? (size_t)index : 0, image); } bool wxANIHandler::DoCanRead(wxInputStream& stream) { - wxInt32 FCC1, FCC2; - wxUint32 datalen ; - - wxInt32 riff32; - memcpy( &riff32, "RIFF", 4 ); - wxInt32 list32; - memcpy( &list32, "LIST", 4 ); - wxInt32 ico32; - memcpy( &ico32, "icon", 4 ); - wxInt32 anih32; - memcpy( &anih32, "anih", 4 ); - - stream.SeekI(0); - if ( !stream.Read(&FCC1, 4) ) - return FALSE; - - if ( FCC1 != riff32 ) - return FALSE; - - // we have a riff file: - while ( stream.IsOk() ) - { - if ( FCC1 == anih32 ) - return TRUE; - // we always have a data size: - stream.Read(&datalen, 4); - datalen = wxINT32_SWAP_ON_BE(datalen) ; - //data should be padded to make even number of bytes - if (datalen % 2 == 1) datalen ++ ; - // now either data or a FCC: - if ( (FCC1 == riff32) || (FCC1 == list32) ) - { - stream.Read(&FCC2, 4); - } - else - { - stream.SeekI(stream.TellI() + datalen); - } + wxANIDecoder decod; + return decod.CanRead(stream); + // it's ok to modify the stream position here +} - // try to read next data chunk: - if ( !stream.Read(&FCC1, 4) ) - { - // reading failed -- either EOF or IO error, bail out anyhow - return FALSE; - } - } +int wxANIHandler::DoGetImageCount(wxInputStream& stream) +{ + wxANIDecoder decoder; + if (!decoder.Load(stream)) // it's ok to modify the stream position here + return wxNOT_FOUND; - return FALSE; + return decoder.GetFrameCount(); } -int wxANIHandler::GetImageCount(wxInputStream& stream) +static bool CanReadICOOrCUR(wxInputStream *stream, wxUint16 resourceType) { - wxInt32 FCC1, FCC2; - wxUint32 datalen ; - - wxInt32 riff32; - memcpy( &riff32, "RIFF", 4 ); - wxInt32 list32; - memcpy( &list32, "LIST", 4 ); - wxInt32 ico32; - memcpy( &ico32, "icon", 4 ); - wxInt32 anih32; - memcpy( &anih32, "anih", 4 ); - - stream.SeekI(0); - stream.Read(&FCC1, 4); - if ( FCC1 != riff32 ) - return wxNOT_FOUND; + // It's ok to modify the stream position in this function. - // we have a riff file: - while ( stream.IsOk() ) + if ( stream->IsSeekable() && stream->SeekI(0) == wxInvalidOffset ) { - // we always have a data size: - stream.Read(&datalen, 4); - datalen = wxINT32_SWAP_ON_BE(datalen) ; - //data should be padded to make even number of bytes - if (datalen % 2 == 1) datalen ++ ; - // now either data or a FCC: - if ( (FCC1 == riff32) || (FCC1 == list32) ) - { - stream.Read(&FCC2, 4); - } - else - { - if ( FCC1 == anih32 ) - { - wxUint32 *pData = new wxUint32[datalen/4]; - stream.Read(pData, datalen); - int nIcons = wxINT32_SWAP_ON_BE(*(pData + 1)); - delete[] pData; - return nIcons; - } - else - stream.SeekI(stream.TellI() + datalen); - } + return false; + } - // try to read next data chunk: - stream.Read(&FCC1, 4); + ICONDIR iconDir; + if ( !stream->ReadAll(&iconDir, sizeof(iconDir)) ) + { + return false; } - return wxNOT_FOUND; + 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