X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/3d926ff8a9ce840252003a7acfa49a1b642f48de..7198c3368055d88249a338eb33b21f051f674806:/src/common/imagtga.cpp diff --git a/src/common/imagtga.cpp b/src/common/imagtga.cpp index e3b5473995..e7203f3065 100644 --- a/src/common/imagtga.cpp +++ b/src/common/imagtga.cpp @@ -1,5 +1,5 @@ ///////////////////////////////////////////////////////////////////////////// -// Name: imagtga.cpp +// Name: src/common/imagtga.cpp // Purpose: wxImage TGA handler // Author: Seth Jackson // CVS-ID: $Id$ @@ -131,6 +131,11 @@ int DecodeRLE(unsigned char* imageData, unsigned long imageSize, index += current * pixelSize; + if (index >= imageSize) + { + return wxTGA_IOERR; + } + // Repeat the pixel length times. if ( !stream.Read(buf, pixelSize) ) return wxTGA_IOERR; @@ -151,6 +156,11 @@ int DecodeRLE(unsigned char* imageData, unsigned long imageSize, index += length; + if (index >= imageSize) + { + return wxTGA_IOERR; + } + // Write the next length pixels directly to the image data. if ( !stream.Read(imageData, length) ) return wxTGA_IOERR; @@ -162,6 +172,40 @@ int DecodeRLE(unsigned char* imageData, unsigned long imageSize, return wxTGA_OK; } +/* +Mimic the behaviour of wxPalette.GetRGB and the way the TGA image handler +used it. That is: don't check the return value of GetRGB and continue decoding +using previous RGB values. + +It might be better to check for palette index bounds and stop decoding if +it's out of range (and add something like wxTGA_DATAERR to indicate unexpected +pixel data). +*/ +static +void Palette_GetRGB(const unsigned char *palette, unsigned int paletteCount, + unsigned int index, + unsigned char *red, unsigned char *green, unsigned char *blue) +{ + if (index >= paletteCount) + { + return; + } + + *red = palette[index]; + *green = palette[(paletteCount * 1) + index]; + *blue = palette[(paletteCount * 2) + index]; +} + +static +void Palette_SetRGB(unsigned char *palette, unsigned int paletteCount, + unsigned int index, + unsigned char red, unsigned char green, unsigned char blue) +{ + palette[index] = red; + palette[(paletteCount * 1) + index] = green; + palette[(paletteCount * 2) + index] = blue; +} + static int ReadTGA(wxImage* image, wxInputStream& stream) { @@ -172,7 +216,8 @@ int ReadTGA(wxImage* image, wxInputStream& stream) short offset = hdr[HDR_OFFSET] + HDR_SIZE; short colorType = hdr[HDR_COLORTYPE]; short imageType = hdr[HDR_IMAGETYPE]; - int paletteLength = hdr[HDR_PALETTELENGTH] + 256 * hdr[HDR_PALETTELENGTH + 1]; + unsigned int paletteLength = hdr[HDR_PALETTELENGTH] + + 256 * hdr[HDR_PALETTELENGTH + 1]; int width = (hdr[HDR_WIDTH] + 256 * hdr[HDR_WIDTH + 1]) - (hdr[HDR_XORIGIN] + 256 * hdr[HDR_XORIGIN + 1]); int height = (hdr[HDR_HEIGHT] + 256 * hdr[HDR_HEIGHT + 1]) - @@ -182,7 +227,7 @@ int ReadTGA(wxImage* image, wxInputStream& stream) image->Create(width, height); - if (!image->Ok()) + if (!image->IsOk()) { return wxTGA_MEMERR; } @@ -214,44 +259,39 @@ int ReadTGA(wxImage* image, wxInputStream& stream) if (stream.SeekI(offset, wxFromStart) == wxInvalidOffset) return wxTGA_INVFORMAT; + unsigned char *palette = NULL; // Load a palette if we have one. if (colorType == wxTGA_MAPPED) { unsigned char buf[3]; - unsigned char* r = new unsigned char[paletteLength]; - unsigned char* g = new unsigned char[paletteLength]; - unsigned char* b = new unsigned char[paletteLength]; + palette = (unsigned char *) malloc(paletteLength * 3); - for (int i = 0; i < paletteLength; i++) + for (unsigned int i = 0; i < paletteLength; i++) { stream.Read(buf, 3); - r[i] = buf[2]; - g[i] = buf[1]; - b[i] = buf[0]; + Palette_SetRGB(palette, paletteLength, i, buf[2], buf[1], buf[0]); } #if wxUSE_PALETTE // Set the palette of the image. - image->SetPalette(wxPalette(paletteLength, r, g, b)); + image->SetPalette(wxPalette((int) paletteLength, &palette[0], + &palette[paletteLength * 1], &palette[paletteLength * 2])); #endif // wxUSE_PALETTE - delete[] r; - delete[] g; - delete[] b; } + wxON_BLOCK_EXIT1(free, palette); + // Handle the various TGA formats we support. switch (imageType) { -#if wxUSE_PALETTE // Raw indexed. case 1: { - const wxPalette& palette = image->GetPalette(); unsigned char r; unsigned char g; unsigned char b; @@ -278,7 +318,8 @@ int ReadTGA(wxImage* image, wxInputStream& stream) { for (unsigned long index = 0; index < imageSize; index += pixelSize) { - palette.GetRGB(imageData[index], &r, &g, &b); + Palette_GetRGB(palette, paletteLength, + imageData[index], &r, &g, &b); *(dst++) = r; *(dst++) = g; @@ -293,7 +334,8 @@ int ReadTGA(wxImage* image, wxInputStream& stream) { for (unsigned long index = 0; index < imageSize; index += pixelSize) { - palette.GetRGB(imageData[index], &r, &g, &b); + Palette_GetRGB(palette, paletteLength, + imageData[index], &r, &g, &b); *(dst++) = r; *(dst++) = g; @@ -308,7 +350,6 @@ int ReadTGA(wxImage* image, wxInputStream& stream) } } break; -#endif // wxUSE_PALETTE // Raw RGB. @@ -441,12 +482,10 @@ int ReadTGA(wxImage* image, wxInputStream& stream) } break; -#if wxUSE_PALETTE // RLE indexed. case 9: { - const wxPalette& palette = image->GetPalette(); unsigned char r; unsigned char g; unsigned char b; @@ -475,7 +514,8 @@ int ReadTGA(wxImage* image, wxInputStream& stream) { for (unsigned long index = 0; index < imageSize; index += pixelSize) { - palette.GetRGB(imageData[index], &r, &g, &b); + Palette_GetRGB(palette, paletteLength, + imageData[index], &r, &g, &b); *(dst++) = r; *(dst++) = g; @@ -490,7 +530,8 @@ int ReadTGA(wxImage* image, wxInputStream& stream) { for (unsigned long index = 0; index < imageSize; index += pixelSize) { - palette.GetRGB(imageData[index], &r, &g, &b); + Palette_GetRGB(palette, paletteLength, + imageData[index], &r, &g, &b); *(dst++) = r; *(dst++) = g; @@ -505,7 +546,6 @@ int ReadTGA(wxImage* image, wxInputStream& stream) } } break; -#endif // wxUSE_PALETTE // RLE RGB. @@ -806,7 +846,7 @@ bool wxTGAHandler::DoCanRead(wxInputStream& stream) unsigned char hdr[HDR_SIZE]; stream.Read(hdr, HDR_SIZE); // it's ok to modify the stream position here - // Check wether we can read the file or not. + // Check whether we can read the file or not. short colorType = hdr[HDR_COLORTYPE]; if ( colorType != wxTGA_UNMAPPED && colorType != wxTGA_MAPPED )