Add input checks, fix overflow/wrap related bugs
This commit is contained in:
@@ -113,8 +113,8 @@ I<BH_BITMAP_RGBA32> pixel format.
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=head2 BH_BitmapNew
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BH_Bitmap *BH_BitmapNew(int width,
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int height,
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BH_Bitmap *BH_BitmapNew(uint32_t width,
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uint32_t height,
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int format,
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int flags,
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void *data,
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@@ -149,8 +149,8 @@ Destroys the bitmap object.
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=head2 BH_BitmapColor
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void BH_BitmapColor(const BH_Bitmap *bitmap,
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int x,
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int y,
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uint32_t x,
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uint32_t y,
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BH_Color *value);
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Reads color value of the pixel at specified position.
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@@ -161,8 +161,8 @@ The I<x> and I<y> parameters specify a position on the bitmap.
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=head2 BH_BitmapSetColor
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void BH_BitmapSetColor(BH_Bitmap *bitmap,
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int x,
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int y,
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uint32_t x,
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uint32_t y,
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const BH_Color *value);
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Writes color value of the pixel at specified position.
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@@ -173,8 +173,8 @@ The I<x> and I<y> parameters specify a position on the bitmap.
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=head2 BH_BitmapIndex
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uint8_t BH_BitmapIndex(const BH_Bitmap *bitmap,
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int x,
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int y);
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uint32_t x,
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uint32_t y);
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Returns the index value at the specified position.
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@@ -184,8 +184,8 @@ The I<x> and I<y> parameters specify a position on the bitmap.
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=head2 BH_BitmapSetIndex
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void BH_BitmapSetIndex(BH_Bitmap *bitmap,
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int x,
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int y,
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uint32_t x,
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uint32_t y,
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uint8_t index);
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Sets the index value at the specified position.
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@@ -196,10 +196,10 @@ The I<x> and I<y> parameters specify a position on the bitmap.
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=head2 BH_BitmapCopy
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BH_Bitmap *BH_BitmapCopy(BH_Bitmap *bitmap,
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int x,
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int y,
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int width,
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int height,
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uint32_t x,
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uint32_t y,
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uint32_t width,
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uint32_t height,
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int shallow);
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Creates a copy of the bitmap region by the given position and size.
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@@ -218,7 +218,7 @@ This function returns a pointer to a new BH_Bitmap object or NULL.
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=head2 BH_BitmapScanline
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void *BH_BitmapScanline(const BH_Bitmap *bitmap,
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int y);
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uint32_t y);
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Returns address of the scanline in the bitmap.
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@@ -226,22 +226,22 @@ Returns address of the scanline in the bitmap.
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=head2 BH_BitmapAt
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void *BH_BitmapAt(const BH_Bitmap *bitmap,
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int x,
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int y);
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uint32_t x,
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uint32_t y);
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Returns address of the pixel in the bitmap.
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=head2 BH_BitmapWidth
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int BH_BitmapWidth(BH_Bitmap *bitmap);
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uint32_t BH_BitmapWidth(BH_Bitmap *bitmap);
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Returns width of the bitmap.
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=head2 BH_BitmapHeight
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int BH_BitmapHeight(BH_Bitmap *bitmap);
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uint32_t BH_BitmapHeight(BH_Bitmap *bitmap);
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Returns height of the bitmap.
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@@ -114,8 +114,8 @@ I<BH_BITMAP_INDEX4> и I<BH_BITMAP_INDEX8>.
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=head2 BH_BitmapNew
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BH_Bitmap *BH_BitmapNew(int width,
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int height,
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BH_Bitmap *BH_BitmapNew(uint32_t width,
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uint32_t height,
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int format,
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int flags,
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void *data,
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@@ -155,8 +155,8 @@ I<BH_BITMAP_INDEX4> и I<BH_BITMAP_INDEX8>.
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=head2 BH_BitmapColor
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void BH_BitmapColor(const BH_Bitmap *bitmap,
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int x,
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int y,
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uint32_t x,
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uint32_t y,
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BH_Color *value);
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Считывает значение цвета пикселя в указанной позиции.
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@@ -167,8 +167,8 @@ I<BH_BITMAP_INDEX4> и I<BH_BITMAP_INDEX8>.
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=head2 BH_BitmapSetColor
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void BH_BitmapSetColor(BH_Bitmap *bitmap,
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int x,
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int y,
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uint32_t x,
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uint32_t y,
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const BH_Color *value);
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Записывает значение цвета пикселя в указанной позиции.
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@@ -179,8 +179,8 @@ I<BH_BITMAP_INDEX4> и I<BH_BITMAP_INDEX8>.
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=head2 BH_BitmapIndex
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uint8_t BH_BitmapIndex(const BH_Bitmap *bitmap,
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int x,
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int y);
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uint32_t x,
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uint32_t y);
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Возвращает значение индекса в указанной позиции.
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@@ -190,8 +190,8 @@ I<BH_BITMAP_INDEX4> и I<BH_BITMAP_INDEX8>.
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=head2 BH_BitmapSetIndex
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void BH_BitmapSetIndex(BH_Bitmap *bitmap,
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int x,
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int y,
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uint32_t x,
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uint32_t y,
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uint8_t index);
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Устанавливает значение индекса в указанной позиции.
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@@ -202,10 +202,10 @@ void BH_BitmapSetIndex(BH_Bitmap *bitmap,
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=head2 BH_BitmapCopy
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BH_Bitmap *BH_BitmapCopy(BH_Bitmap *bitmap,
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int x,
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int y,
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int width,
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int height,
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uint32_t x,
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uint32_t y,
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uint32_t width,
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uint32_t height,
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int shallow);
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Создает копию области растрового изображения с заданным положением и размером.
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@@ -225,7 +225,7 @@ void BH_BitmapSetIndex(BH_Bitmap *bitmap,
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=head2 BH_BitmapScanline
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void *BH_BitmapScanline(const BH_Bitmap *bitmap,
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int y);
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uint32_t y);
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Возвращает адрес строки сканирования в растровом изображении.
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@@ -233,22 +233,22 @@ void BH_BitmapSetIndex(BH_Bitmap *bitmap,
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=head2 BH_BitmapAt
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void *BH_BitmapAt(const BH_Bitmap *bitmap,
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int x,
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int y);
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uint32_t x,
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uint32_t y);
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Возвращает адрес пикселя в растровом изображении.
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=head2 BH_BitmapWidth
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int BH_BitmapWidth(BH_Bitmap *bitmap);
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uint32_t BH_BitmapWidth(BH_Bitmap *bitmap);
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Возвращает ширину растрового изображения.
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=head2 BH_BitmapHeight
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int BH_BitmapHeight(BH_Bitmap *bitmap);
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uint32_t BH_BitmapHeight(BH_Bitmap *bitmap);
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Возвращает высоту растрового изображения.
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@@ -35,8 +35,8 @@ typedef struct BH_Bitmap BH_Bitmap;
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#define BH_BITMAP_FLAG_EXT_PALETTE 0x0004
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BH_Bitmap *BH_BitmapNew(int width,
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int height,
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BH_Bitmap *BH_BitmapNew(uint32_t width,
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uint32_t height,
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int format,
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int flags,
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void *data,
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@@ -47,49 +47,49 @@ void BH_BitmapFree(BH_Bitmap *bitmap);
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void BH_BitmapColor(const BH_Bitmap *bitmap,
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int x,
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int y,
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uint32_t x,
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uint32_t y,
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BH_Color *value);
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void BH_BitmapSetColor(BH_Bitmap *bitmap,
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int x,
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int y,
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uint32_t x,
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uint32_t y,
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const BH_Color *value);
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uint8_t BH_BitmapIndex(const BH_Bitmap *bitmap,
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int x,
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int y);
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uint32_t x,
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uint32_t y);
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void BH_BitmapSetIndex(BH_Bitmap *bitmap,
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int x,
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int y,
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uint32_t x,
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uint32_t y,
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uint8_t index);
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BH_Bitmap *BH_BitmapCopy(BH_Bitmap *bitmap,
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int x,
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int y,
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int width,
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int height,
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uint32_t x,
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uint32_t y,
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uint32_t width,
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uint32_t height,
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int shallow);
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void *BH_BitmapScanline(const BH_Bitmap *bitmap,
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int y);
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uint32_t y);
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void *BH_BitmapAt(const BH_Bitmap *bitmap,
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int x,
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int y);
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uint32_t x,
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uint32_t y);
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int BH_BitmapWidth(BH_Bitmap *bitmap);
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uint32_t BH_BitmapWidth(BH_Bitmap *bitmap);
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int BH_BitmapHeight(BH_Bitmap *bitmap);
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uint32_t BH_BitmapHeight(BH_Bitmap *bitmap);
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int BH_BitmapFormat(BH_Bitmap *bitmap);
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126
src/Bitmap.c
126
src/Bitmap.c
@@ -9,8 +9,8 @@
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struct BH_Bitmap
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{
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int width;
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int height;
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uint32_t width;
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uint32_t height;
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int format;
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int flags;
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size_t step;
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@@ -131,7 +131,7 @@ static size_t calculateStep(int format)
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static uint8_t bitmapIndex(void *data,
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int format,
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int x)
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uint32_t x)
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{
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int isLSB;
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uint8_t octet;
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@@ -161,7 +161,7 @@ static uint8_t bitmapIndex(void *data,
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static void setBitmapIndex(void *data,
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int format,
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int x,
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uint32_t x,
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uint8_t index)
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{
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int isLSB;
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@@ -199,7 +199,7 @@ static void bitmapColor(void *data,
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void *palette,
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int format,
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BH_Color *value,
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int x)
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uint32_t x)
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{
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switch (format & 0x0FFF)
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{
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@@ -423,7 +423,7 @@ static void setBitmapColor(void *data,
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void *palette,
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int format,
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const BH_Color *value,
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int x)
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uint32_t x)
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{
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switch (format & 0x0FFF)
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{
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@@ -611,7 +611,7 @@ static void setBitmapColor(void *data,
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static void *rowAt(void *data,
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int format,
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int step,
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int x)
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uint32_t x)
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{
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switch (format & 0x0FFF)
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{
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@@ -631,16 +631,22 @@ static void *rowAt(void *data,
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static size_t calculateStride(int format,
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int width)
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uint32_t width)
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{
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size_t step;
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switch (format & 0x0FFF)
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{
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case BH_BITMAP_INDEX1: return (width + 7) / 8;
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case BH_BITMAP_INDEX2: return (width + 3) / 4;
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case BH_BITMAP_INDEX4: return (width + 1) / 2;
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case BH_BITMAP_INDEX8: return width * calculateStep(format);
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}
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return width * calculateStep(format);
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step = calculateStep(format);
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if (BH_CHECK_UMUL_WRAP(step, width, size_t))
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return 0;
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return step * width;
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}
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@@ -673,8 +679,8 @@ static size_t calculateTrailer(int format)
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/* Public functions */
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BH_Bitmap *BH_BitmapNew(int width,
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int height,
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BH_Bitmap *BH_BitmapNew(uint32_t width,
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uint32_t height,
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int format,
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int flags,
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void *data,
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@@ -682,7 +688,12 @@ BH_Bitmap *BH_BitmapNew(int width,
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{
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BH_Bitmap *result;
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int needPalette;
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size_t header, body, trailer, stride, step;
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size_t header, body, allocSize, stride, step;
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/* Basic sanity check */
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if (width == 0 || width >= 0x7FFFFFFF ||
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height == 0 || height >= 0x7FFFFFFF)
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return NULL;
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/* Unset internal flags */
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flags &= ~BH_BITMAP_FLAG_EXT_DATA;
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@@ -693,19 +704,35 @@ BH_Bitmap *BH_BitmapNew(int width,
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stride = calculateStride(format, width);
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needPalette = isPaletteNeeded(format);
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/* Check stride overflow */
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if (!stride)
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return NULL;
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if (flags & BH_BITMAP_FLAG_ALIGN32)
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{
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if (BH_CHECK_UADD_WRAP(stride, sizeof(uint32_t) - 1, size_t))
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return NULL;
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stride = (stride + sizeof(uint32_t) - 1) & ~(sizeof(uint32_t) - 1);
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}
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header = sizeof(*result);
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header = (header + (sizeof(uint64_t) - 1)) & ~(sizeof(uint64_t) - 1);
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body = (stride * height + (sizeof(uint32_t) - 1)) & ~(sizeof(uint32_t) - 1);
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trailer = calculateTrailer(format);
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allocSize = calculateTrailer(format);
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body = stride * height;
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if (BH_CHECK_UMUL_WRAP(stride, height, size_t))
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return NULL;
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if (BH_CHECK_UADD_WRAP(body, sizeof(uint32_t) - 1, size_t))
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return NULL;
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body = (body + (sizeof(uint32_t) - 1)) & ~(sizeof(uint32_t) - 1);
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/* Adjust body and trailer size if ext data or palette is provided */
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if (palette)
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{
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flags |= BH_BITMAP_FLAG_EXT_PALETTE;
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trailer = 0;
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allocSize = 0;
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}
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if (data)
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@@ -714,8 +741,16 @@ BH_Bitmap *BH_BitmapNew(int width,
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body = 0;
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}
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if (BH_CHECK_UADD_WRAP(allocSize, header, size_t))
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return NULL;
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allocSize += header;
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if (BH_CHECK_UADD_WRAP(allocSize, body, size_t))
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return NULL;
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allocSize += body;
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/* Allocate and setup bitmap data */
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result = malloc(header + body + trailer);
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result = malloc(allocSize);
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if (!result)
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return NULL;
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@@ -745,16 +780,16 @@ void BH_BitmapFree(BH_Bitmap *bitmap)
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void BH_BitmapColor(const BH_Bitmap *bitmap,
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int x,
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int y,
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uint32_t x,
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uint32_t y,
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BH_Color *value)
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{
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bitmapColor(BH_BitmapAt(bitmap, x, y), bitmap->palette, bitmap->format, value, x);
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}
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void BH_BitmapSetColor(BH_Bitmap *bitmap,
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int x,
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int y,
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uint32_t x,
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uint32_t y,
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const BH_Color *value)
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{
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setBitmapColor(BH_BitmapAt(bitmap, x, y), bitmap->palette, bitmap->format, value, x);
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@@ -762,33 +797,28 @@ void BH_BitmapSetColor(BH_Bitmap *bitmap,
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BH_Bitmap *BH_BitmapCopy(BH_Bitmap *bitmap,
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int x,
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int y,
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int width,
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int height,
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uint32_t x,
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uint32_t y,
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uint32_t width,
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uint32_t height,
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int shallow)
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{
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BH_Bitmap *result;
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int i, j;
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uint32_t i, j;
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/* Check for bogus width and height */
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if (width < 0 || height < 0)
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/* Sanity checks */
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if (!width || !height || x >= bitmap->width || y >= bitmap->height)
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return NULL;
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if (width < bitmap->width - x || height < bitmap->height - y)
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return NULL;
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/* Shallow copy can't go out of bounds of the source bitmap */
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if (shallow)
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{
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if (x < 0 || x > bitmap->width || y < 0 || y > bitmap->height)
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return NULL;
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if (width < 0 || width > bitmap->width - x ||
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height < 0 || height > bitmap->height - y)
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return NULL;
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result = BH_BitmapNew(width, height, bitmap->format, bitmap->flags,
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BH_BitmapAt(bitmap, x, y), bitmap->palette);
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result->stride = bitmap->stride;
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return result;
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}
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|
||||
@@ -806,13 +836,7 @@ BH_Bitmap *BH_BitmapCopy(BH_Bitmap *bitmap,
|
||||
for (i = 0; i < width; ++i)
|
||||
{
|
||||
BH_Color color;
|
||||
memset(&color, 0, sizeof(color));
|
||||
|
||||
|
||||
if (i + x >= 0 && i + x < bitmap->width &&
|
||||
j + y >= 0 && j + y < bitmap->height)
|
||||
BH_BitmapColor(bitmap, i + x, j + y, &color);
|
||||
|
||||
BH_BitmapSetColor(result, i, j, &color);
|
||||
}
|
||||
}
|
||||
@@ -822,16 +846,16 @@ BH_Bitmap *BH_BitmapCopy(BH_Bitmap *bitmap,
|
||||
|
||||
|
||||
uint8_t BH_BitmapIndex(const BH_Bitmap *bitmap,
|
||||
int x,
|
||||
int y)
|
||||
uint32_t x,
|
||||
uint32_t y)
|
||||
{
|
||||
return bitmapIndex(BH_BitmapAt(bitmap, x, y), bitmap->format, x);
|
||||
}
|
||||
|
||||
|
||||
void BH_BitmapSetIndex(BH_Bitmap *bitmap,
|
||||
int x,
|
||||
int y,
|
||||
uint32_t x,
|
||||
uint32_t y,
|
||||
uint8_t index)
|
||||
{
|
||||
setBitmapIndex(BH_BitmapAt(bitmap, x, y), bitmap->format, x, index);
|
||||
@@ -839,27 +863,27 @@ void BH_BitmapSetIndex(BH_Bitmap *bitmap,
|
||||
|
||||
|
||||
void *BH_BitmapScanline(const BH_Bitmap *bitmap,
|
||||
int y)
|
||||
uint32_t y)
|
||||
{
|
||||
return bitmap->data + y * bitmap->stride;
|
||||
}
|
||||
|
||||
|
||||
void *BH_BitmapAt(const BH_Bitmap *bitmap,
|
||||
int x,
|
||||
int y)
|
||||
uint32_t x,
|
||||
uint32_t y)
|
||||
{
|
||||
return rowAt(BH_BitmapScanline(bitmap, y), bitmap->format, bitmap->step, x);
|
||||
}
|
||||
|
||||
|
||||
int BH_BitmapWidth(BH_Bitmap *bitmap)
|
||||
uint32_t BH_BitmapWidth(BH_Bitmap *bitmap)
|
||||
{
|
||||
return bitmap->width;
|
||||
}
|
||||
|
||||
|
||||
int BH_BitmapHeight(BH_Bitmap *bitmap)
|
||||
uint32_t BH_BitmapHeight(BH_Bitmap *bitmap)
|
||||
{
|
||||
return bitmap->height;
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user