Struct image::io::Limits

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pub struct Limits {
    pub max_image_width: Option<u32>,
    pub max_image_height: Option<u32>,
    pub max_alloc: Option<u64>,
    /* private fields */
}
Expand description

Resource limits for decoding.

Limits can be either strict or non-strict. Non-strict limits are best-effort limits where the library does not guarantee that limit will not be exceeded. Do note that it is still considered a bug if a non-strict limit is exceeded, however as some of the underlying decoders do not support not support such limits one cannot rely on these limits being supported. For stric limits the library makes a stronger guarantee that the limit will not be exceeded. Exceeding a strict limit is considered a critical bug. If a decoder cannot guarantee that it will uphold a strict limit it must fail with image::error::LimitErrorKind::Unsupported.

Currently the only strict limits supported are the max_image_width and max_image_height limits, however more will be added in the future. LimitSupport will default to support being false and decoders should enable support for the limits they support in ImageDecoder::set_limits.

The limit check should only ever fail if a limit will be exceeded or an unsupported strict limit is used.

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§max_image_width: Option<u32>

The maximum allowed image width. This limit is strict. The default is no limit.

§max_image_height: Option<u32>

The maximum allowed image height. This limit is strict. The default is no limit.

§max_alloc: Option<u64>

The maximum allowed sum of allocations allocated by the decoder at any one time excluding allocator overhead. This limit is non-strict by default and some decoders may ignore it. The default is 512MiB.

Implementations§

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impl Limits

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pub fn no_limits() -> Limits

Disable all limits.

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pub fn check_support(&self, _supported: &LimitSupport) -> ImageResult<()>

This function checks that all currently set strict limits are supported.

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pub fn check_dimensions(&self, width: u32, height: u32) -> ImageResult<()>

This function checks the max_image_width and max_image_height limits given the image width and height.

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pub fn reserve(&mut self, amount: u64) -> ImageResult<()>

This function checks that the current limit allows for reserving the set amount of bytes, it then reduces the limit accordingly.

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pub fn reserve_usize(&mut self, amount: usize) -> ImageResult<()>

This function acts identically to [reserve], but takes a usize for convenience.

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pub fn reserve_buffer( &mut self, width: u32, height: u32, color_type: ColorType ) -> ImageResult<()>

This function acts identically to [reserve], but accepts the width, height and color type used to create an [ImageBuffer] and does all the math for you.

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pub fn free(&mut self, amount: u64)

This function increases the max_alloc limit with amount. Should only be used together with reserve.

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pub fn free_usize(&mut self, amount: usize)

This function acts identically to [free], but takes a usize for convenience.

Trait Implementations§

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impl Clone for Limits

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fn clone(&self) -> Limits

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for Limits

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl Default for Limits

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fn default() -> Limits

Returns the “default value” for a type. Read more
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impl Hash for Limits

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fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher. Read more
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fn hash_slice<H>(data: &[Self], state: &mut H)
where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. Read more
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impl PartialEq for Limits

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fn eq(&self, other: &Limits) -> bool

This method tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl Eq for Limits

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impl StructuralEq for Limits

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impl StructuralPartialEq for Limits

Auto Trait Implementations§

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.