49 lines
1.9 KiB
Rust
49 lines
1.9 KiB
Rust
pub mod bitmap_data;
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pub mod turbulence;
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/// Determine if a particular bitmap data size is valid.
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///
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/// This enforces limits on BitmapData as specified in the Flash documentation.
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/// Specifically, from <https://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/flash/display/BitmapData.html>:
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///
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/// "In AIR 1.5 and Flash Player 10, the maximum size for a BitmapData object
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/// is 8,191 pixels in width or height, and the total number of pixels cannot
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/// exceed 16,777,215 pixels. (So, if a BitmapData object is 8,191 pixels wide,
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/// it can only be 2,048 pixels high.) In Flash Player 9 and earlier and
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/// AIR 1.1 and earlier, the limitation is 2,880 pixels in height and 2,880 in
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/// width. Starting with AIR 3 and Flash player 11, the size limits for a
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/// BitmapData object have been removed. The maximum size of a bitmap is now
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/// dependent on the operating system."
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///
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/// In addition, we found the following undocumented limits:
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///
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/// - Width and height of 0 are invalid in all versions
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/// - Widths and heights exceeding 0x666666 are invalid in all versions
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/// - Pixel counts (of any width/height) exceeding 0x20000000 pixels
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///
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/// All of these are curently enforced.
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pub fn is_size_valid(swf_version: u8, width: u32, height: u32) -> bool {
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// From :
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//
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// In addition, width and height of 0 are invalid in all versions.
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if width == 0 || height == 0 {
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return false;
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}
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if swf_version <= 9 {
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if width > 2880 || height > 2880 {
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return false;
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}
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} else if swf_version <= 12 {
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if width >= 0x2000 || height >= 0x2000 || width * height >= 0x1000000 {
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return false;
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}
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} else {
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// These limits are undocumented, but seem to be reliable.
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// TODO: Do they vary across different machines?
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if width > 0x6666666 || height > 0x6666666 || width as u64 * height as u64 >= 0x20000000 {
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return false;
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}
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}
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true
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}
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